2024/10/23 更新

写真a

イナガキ テツヤ
稲垣 哲也
INAGAKI Tetsuya
所属
大学院生命農学研究科 森林・環境資源科学専攻 森林・環境資源科学 准教授
大学院担当
大学院生命農学研究科
学部担当
農学部 生物環境科学科
職名
准教授
連絡先
メールアドレス
ホームページ

学位 1

  1. 博士(農学) ( 2011年3月   名古屋大学 ) 

研究キーワード 16

  1. 植物工場

  2. 画像解析

  3. 木質科学

  4. ケモメトリクス

  5. 機械学習

  6. X線回折法

  7. THz時間領域分光法

  8. 近赤外分光法

  9. 分光分析

  10. 近赤外分光法

  11. 農業工学

  12. 機械学習

  13. 木質科学

  14. ケモメトリクス

  15. X線回折法

  16. THz分光法

研究分野 7

  1. ライフサイエンス / 森林科学

  2. ものづくり技術(機械・電気電子・化学工学) / 計測工学

  3. 情報通信 / 統計科学

  4. 環境・農学 / 農業環境工学、農業情報工学

  5. ものづくり技術(機械・電気電子・化学工学) / 計測工学

  6. 情報通信 / 統計科学

  7. ライフサイエンス / 森林科学

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現在の研究課題とSDGs 3

  1. 植物対話型植物工場の構築

  2. 木質素材の非破壊材質評価

  3. 農産物の非破壊品質評価

経歴 8

  1. 名古屋大学   生命農学研究科   准教授

    2021年4月 - 現在

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    国名:日本国

  2. 名古屋大学   大学院生命農学研究科   准教授

    2021年4月 - 現在

  3. 名古屋大学   大学院生命農学研究科   講師

    2016年9月 - 2021年3月

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    国名:日本国

  4. 名古屋大学   大学院生命農学研究科   講師

    2016年9月 - 2021年3月

  5. University of Northern British Columbia   研究員

    2011年10月 - 2012年3月

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    国名:カナダ

  6. 名古屋大学   大学院生命農学研究科   助教

    2011年4月 - 2017年8月

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    国名:日本国

  7. 名古屋大学   大学院生命農学研究科   助教

    2011年4月 - 2017年8月

  8. 日本学術振興会   DC1特別研究員   研究員

    2008年4月 - 2010年3月

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    国名:日本国

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学歴 3

  1. 名古屋大学   農学研究科   生物圏資源学専攻

    2008年4月 - 2011年3月

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    国名: 日本国

  2. 名古屋大学   農学研究科

    - 2008年3月

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    国名: 日本国

  3. 名古屋大学   農学部   応用生物科学科

    - 2006年3月

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    国名: 日本国

所属学協会 8

  1. 日本分光学会

  2. 近赤外研究会

  3. 日本木材加工技術協会

  4. 日本木材学会

  5. 近赤外研究会

  6. 日本木材学会

  7. 日本木材加工技術協会

  8. 日本分光学会

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委員歴 2

  1. 日本木材学会   常任理事  

    2022年 - 2024年   

  2. 名古屋大学農学部同窓会   理事  

    2021年 - 現在   

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    団体区分:その他

受賞 7

  1. 日本木材学会賞

    2020年3月   一般社団法人日本木材学会   広帯域分光分析による木材の物性解析および非破壊材質評価

    稲垣哲也

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    受賞区分:学会誌・学術雑誌による顕彰 

  2. 2020年度全学教育科目担当教員顕彰

    2021年4月   名古屋大学教養教育院  

    2020年度春学期物理学実験担当

  3. 令和元年度コニカミノルタ画像科学奨励賞

    2020年3月   公益財団法人コニカミノルタ科学技術振興財団   近赤外ハイパースペクトラルイメージングのディープラーニング認識

    稲垣哲也

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    受賞区分:出版社・新聞社・財団等の賞 

  4. 日本木材学会賞

    2020年3月   一般社団法人日本木材学会   広帯域分光分析による木材の物性解析および非破壊材質評価

  5. 紙パルプ技術協会

    2018年10月   紙パルプ技術協会賞   近赤外分光法を用いた紙中の木材パルプの複合的評価手法の開発

  6. 印刷朝暘会賞

    2018年4月   一般財団法人印刷朝陽会   近赤外分光法を用いた紙中の木材パルプの複合的評価手法の開発

  7. NIR advance Award

    2013年3月   近赤外研究会  

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    受賞国:日本国

▼全件表示

 

論文 94

  1. Determination of true optical absorption and scattering coefficient of wooden cell wall substance by time-of-flight near infrared spectroscopy 査読有り

    Ryunosuke Kitamura, Tetsuya Inagaki and Satoru Tsuchikawa

    Optic Express   24 巻   頁: 3999-4009   2016年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  2. Prediction of oven-dry density of wood by time-domain terahertz spectroscopy 査読有り

    Tetsuya Inagaki, Ian D. Hartley, Satoru Tsuchikawa Matthew Reid

    Holzforschung     2013年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1515/hf-2013-0013

  3. Difference of Cellulosic Crystalline Structure in Wood between Hydrothermal and Ageing Degradation Observed by NIRs and XRD 査読有り

    Tetsuya Inagaki, Heinz W. Siesler, Katsuya Mitsui and Satoru Tsuchikawa

    Biomacromolecules   11 巻   頁: 2300   2010年

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  4. The effects of growth rate on the age dependent variation of wood properties evaluated by differential geometry 査読有り

    Fujimoto T., Ma T., Inagaki T., Tsuchikawa S.

    Industrial Crops and Products   222 巻   2024年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Industrial Crops and Products  

    A correct understanding of the variations seen in wood properties with tree age is of great importance for both the forestry and timber industries. However, this phenomenon is complex because of the differences between individuals and the variations associated with multiple wood properties. In this study, we have identified age-dependent changes in the state of wood as a surface that contains comprehensive information on the coupled variation of multiple properties in many individuals. By comparing the geometric quantities of the surface between sample groups with different growth rates caused by silvicultural treatments, we have discussed the ideal forest management in terms of wood quality and forest ecosystems. The slow-growing group showed larger Gaussian curvatures of the surface and a more tortuous and longer geodesic than the fast-growing group, resulting in less energy loss during tree growth. Assuming that processes with high symmetry are more sustainable, the characteristic class representing the global structure of the growth process indicates that the slow-growing group follows a more sustainable process than the fast-growing group. These results indicate that it is ideal for trees to grow slowly, in terms of variation of wood properties and forest ecosystem. Because the geometric quantities are invariant under coordinate transformations, the proposed methods provide us with the intrinsic behavior of the tree growth process independent of a specific coordinate system, that is, a concrete space spanned by the measured wood properties.

    DOI: 10.1016/j.indcrop.2024.119596

    Scopus

  5. Enhanced quantification of chlorophyll a and its degradation products in olive oil using time-resolved laser-induced fluorescence fingerprint analysis 招待有り 査読有り

    Ma T., Jiang H., Tsuchikawa S., Inagaki T.

    Food Chemistry   460 巻   2024年12月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Food Chemistry  

    Potential errors in the fluorescence analysis of chlorophylls and their degradation products, primarily due to spectral overlap and inner filter, are widely acknowledged. This study aimed to devise a sensitivity-enhanced technique for the concurrent quantification of chlorophyll a and its degradation products while minimizing effects from type-B chlorophylls. Initially, a time-resolved laser-induced fluorescence spectroscopic system was designed and tested on stardard chlorophyll samples. The origins, implications, and mitigation strategies of spectral overlap and the inner filter effect on the measured fluorescence intensity were thoroughly examined. Then, this methodology was proved to be efficacious within complex liquid matrices derived from olive oil. The experimental outcomes not only shed additional light on the mechanisms of chlorophyll fluorescence overlap and the inner filter effect, but also establish a general framework for developing spectrally and timely resolved fluorescence fingerprint analysis for the simultaneous quantification of chlorophylls and their degradation products at high concentrations.

    DOI: 10.1016/j.foodchem.2024.140656

    Scopus

    PubMed

  6. Three-dimensional modeling of moisture transport in wood using near-infrared hyperspectral imaging and X-ray computed tomography in conjunction with finite element analysis 査読有り

    Zeng W., Fujimoto T., Inagaki T., Tsuchikawa S., Ma T.

    Journal of Wood Science   70 巻 ( 1 )   2024年12月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Wood Science  

    In past studies, finite element analysis (FEA) methods have been used to simulate the thermal and moisture coupling of wood. However, challenges remain in achieving high-quality three-dimensional (3D) simulations, mainly because of the heterogeneous and complex structure of wood and its difficult-to-detect internal structure, which makes modeling challenging, in addition to the lack of robust experimental techniques to validate simulation results. In this study, the FEA simulation model was refined by combining X-ray computed tomography (CT) and near-infrared hyperspectral imaging (NIR-HSI). CT was used to probe the 3D density of wood, and a novel FEA tetrahedral mesh was constructed based on the results. The NIR-HSI method visualizes the moisture distribution during adsorption and desorption inside the wood. This result is then used to adjust the parameters of the FEA simulation model and as a reference value to evaluate the simulation results. The visualization and simulation results fit well with the theoretical properties. The simulation results can more accurately reflect the spatial distribution and transfer trend of wood moisture at different points in time. Therefore, the CT and NIR-HSI-based 3D heat and moisture-coupled FEA model of wood proposed in this study can be used as a basis for optimizing drying parameters to provide high-quality wood.

    DOI: 10.1186/s10086-023-02120-2

    Scopus

  7. Evaluating Soluble Solids in White Strawberries: A Comparative Analysis of Vis-NIR and NIR Spectroscopy 査読有り

    Seki H., Murakami H., Ma T., Tsuchikawa S., Inagaki T.

    Foods   13 巻 ( 14 )   2024年7月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Foods  

    In recent years, due to breeding improvements, strawberries with low anthocyanin content and a white rind are now available, and they are highly valued in the market. Strawberries with white skin color do not turn red when ripe, making it difficult to judge ripeness. The soluble solids content (SSC) is an indicator of fruit quality and is closely related to ripeness. In this study, visible–near-infrared (Vis-NIR) spectroscopy and near-infrared (NIR) spectroscopy are used for non-destructive evaluation of the SSC. Vis-NIR (500–978 nm) and NIR (908–1676 nm) data collected from 180 samples of “Tochigi iW1 go” white strawberries and 150 samples of “Tochigi i27 go” red strawberries are investigated. The white strawberry SSC model developed by partial least squares regression (PLSR) in Vis-NIR had a determination coefficient R2p of 0.89 and a root mean square error prediction (RMSEP) of 0.40%; the model developed in NIR showed satisfactory estimation accuracy with an R2p of 0.85 and an RMSEP of 0.43%. These estimation accuracies were comparable to the results of the red strawberry model. Absorption derived from anthocyanin and chlorophyll pigments in white strawberries was observed in the Vis-NIR region. In addition, a dataset consisting of red and white strawberries can be used to predict the pigment-independent SSC. These results contribute to the development of methods for a rapid fruit sorting system and the development of an on-site ripeness determination system.

    DOI: 10.3390/foods13142274

    Scopus

  8. Cellulose crystalline structure and thermal properties under heat treatment: An investigation by two-dimensional correlation of near infrared spectroscopy and differential scanning calorimetry 査読有り 国際共著

    Mahdiyanti S.H., Asaoka M., Inagaki T., Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   32 巻 ( 3 ) 頁: 113 - 124   2024年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Near Infrared Spectroscopy  

    This study investigated the thermal behavior and crystallinity of microcrystalline cellulose (MCC) under heat treatment using near infrared (NIR) spectroscopy and differential scanning calorimetry (DSC). The results showed that heat treatment reduced the crystallinity and thermal stability of MCC at a certain point, and that the changes in the chemical components and structure of MCC were correlated with the heat flow measured by DSC. The analysis was performed using two-dimensional correlation spectroscopy (2DCOS), which revealed the simultaneous changes in the NIR second-derivative spectra and the DSC thermograms of heat-treated MCC. Linear regression analysis showed a high r2 value of 0.90 between the DSC enthalpy change at 270 °C–400°C and the PC1 score of NIR second-derivative spectra at 7500–4100 cm−1. The 2DCOS synchronous map showed a positive correlation at 6656–6229 cm−1 with a r value of 0.70–0.98 for the endothermic reaction, and a negative correlation at 6229; 5620; 5401; 4844; 4535 cm−1 with a r value of −0.90 to −0.99 for the exothermic reaction. This study extended the knowledge on the thermal behavior and decomposition mechanisms of heat-treated MCC, and provided a useful method for cellulose characterization and identification.

    DOI: 10.1177/09670335241257649

    Scopus

  9. Effect of dielectric barrier discharge (DBD) plasma treatment on physicochemical and 3D printing properties of wheat starch 査読有り 国際共著

    Ma S., Ma T., Tsuchikawa S., Inagaki T., Wang H., Jiang H.

    International Journal of Biological Macromolecules   269 巻   2024年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:International Journal of Biological Macromolecules  

    In recent years, the focus has shifted towards carbohydrate-based hydrogels and their eco-friendly preparation methods. This study involved an investigation into the treatment of wheat starch using dielectric barrier discharge (DBD) plasma technology over varying time gradients (0, 2, 5, 10, 15, and 20 min). The objective was to systematically examine the impact of different treatment durations on the physicochemical properties of wheat starch and the suitability of its gels for 3D printing. Morphology of wheat starch remained intact after DBD treatment. However, it led to a reduction in the amylose content, molecular weight, and crystallinity. This subsequently resulted in a decrease in the pasting temperature and viscosity. Moreover, the gels of the DBD-treated starch exhibited superior 3D printing performance. After a 2-min DBD treatment, the 3D printed samples of the wheat starch gel showed no significant improvements, as broken bars were evident on the surface of the 3D printed graphic, whereas DBD-20 showed better printing accuracy and surface structure, compared to the original starch without slumping. These results suggested that DBD technology holds potential for developing new starch-based gels with impressive 3D printing properties.

    DOI: 10.1016/j.ijbiomac.2024.132159

    Scopus

    PubMed

  10. Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose: tracking lattice changes following physical treatments 査読有り

    Wang H., Aoki D., Teramoto Y., Tsuchikawa S., Inagaki T.

    Cellulose   31 巻 ( 7 ) 頁: 4085 - 4098   2024年5月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cellulose  

    The authors’ series of studies aimed to explore the potential of terahertz time-domain spectroscopy (THz-TDS) in cellulose crystallographic studies, since THz radiation can detect most intermolecular vibrations and respond to lattice phonons. In this study, we tracked changes in four types of cellulose after ball milling. As the planetary ball milling time increases, it is observed through electron microscopy that the four types of cellulose particles are gradually destroyed into finer particles, while gel permeation chromatography can prove that the molecular weight gradually decreases after ball milling and the dispersity gradually approaches one, which indicates that the dispersion of the material was reduced. The most fascinating observation was made by THz-TDS, that is we have confirmed that after ball milling, the absorption characteristics of cellulose I and II in cellulose I treated with 10% NaOH (crystalline partial transition from cellulose I to II) exhibited an opposite trend. Specifically, the absorption of cellulose II at 2.40THz and 2.77THz increased, while the absorption of cellulose I at 2.11THz and 3.04THz decreased after ball milling, which suggests an increased conversion rate of cellulose I to cellulose II post-milling. Cellulose with different crystalline allomorphs shows different characteristic absorption in the THz region, and the peak position will not change even after the ball milling, only the absorption intensity changes. Although it can be observed through the most traditional X-ray diffraction method that the crystallinity index of all cellulose samples gradually decreases after ball milling. However, different from the THz results, the change after ball milling of cellulose I treated with 10% NaOH is only reflected in very subtle pattern changes, that is, the peak close to the 200 crystalline plane position is slightly shifted after ball milling.

    DOI: 10.1007/s10570-024-05834-8

    Scopus

  11. Development of a sensitivity-enhanced fluorescence lifetime spectroscopic method for nondestructive quality monitoring of mature tomatoes during storage 査読有り

    Ma T., Inagaki T., Tsuchikawa S.

    Scientia Horticulturae   330 巻   2024年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Scientia Horticulturae  

    The decay of fluorescence lifetime (FLT) is an absolute indication for observing the environment surrounding the fluorescent molecules. This study presents the characterization of fluorescence intensity and the FLT in tomatoes, spanning from the green to the red stage, using a novel time-resolved and laser-induced fluorescence (TRLIF) spectroscopic system. Furthermore, the applicability of this method was assessed for evaluating the postharvest quality of commercially acquired red tomatoes. The results collectively indicate a progressive decrease in the FLT of the red tomatoes throughout shelf-life storage. The average FLT loss decreased by approximately 17, 26, 32, and 38% after 1, 2, 3, and 4 d, respectively. Furthermore, the first principal component scores of the time-resolved spectra were confirmed to be stable for early quality degradation monitoring purposes. This investigation highlights that the devised TRLIF spectroscopic technique is a non-destructive and robust method for studying the degradation of fluorescent compounds. It facilitates an in-depth exploration of the underlying mechanisms behind the fluorescent phenomena in postharvest research.

    DOI: 10.1016/j.scienta.2024.113059

    Scopus

  12. Three-dimensional visualization and detection of early bruise in apple based on near-infrared hyperspectral imaging coupled with geometrical influence correction 査読有り

    Li B., Ma T., Bai L., Inagaki T., Seki H., Tsuchikawa S.

    Postharvest Biology and Technology   210 巻   2024年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Postharvest Biology and Technology  

    Visible-near-infrared (Vis-NIR) spectral imaging holds great promise for the automatic detection of fruit defects. However, uneven brightness resulting from fruit geometry and the limitations of one-directional imaging significantly restrict the current detection to a limited area. This study presents a rotation measurement system that combines a line-scan NIR-hyperspectral imaging (HSI) camera with a laser profile. A total of 72 apple samples with bruises in the central and edge regions were prepared. A 360° scanning approach was employed to collect HSI and shape data from the entire surface of the samples over a 6-h post-bruising period. Height and angle corrections were applied to eliminate the surface geometric influences on the HSI data, resulting in improved reflectance spectrum uniformity. A two-step principal component analysis method was employed for image enhancement, followed by a straightforward bruise detection technique using global segmentation and connected-domain selection. The results demonstrated an overall improvement in bruise detection over time. Moreover, the correction significantly enhanced the detection accuracy. After 6 h of bruising, the corrected data achieved a classification accuracy of 90.3% and an identification rate of 83.3% for central bruises and 61.1% for edge bruises, whereas the uncorrected data yielded 70.8%, 58.3%, and 31.9%, respectively. Thus, this study successfully detected early bruising across the entire surface of apples and improved the detection in low-intensity edge areas. The proposed method has the potential to contribute to the comprehensive evaluation of agricultural products with irregular geometries.

    DOI: 10.1016/j.postharvbio.2023.112753

    Scopus

  13. Non-Destructive Near-Infrared Moisture Detection of Dried Goji (Lycium barbarum L.) Berry 査読有り

    Kang R., Ma T., Tsuchikawa S., Inagaki T., Chen J., Zhao J., Li D., Cui G.

    Horticulturae   10 巻 ( 3 )   2024年3月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Horticulturae  

    To detect the moisture of dried Goji (Lycium barbarum L.) berries nondestructively, a near-infrared (NIR) hyperspectral imager was used for experiments. NIR hyperspectral data were obtained and processed by standard normal variate (SNV) calculation using the MATLAB software v.R2016a. On the basis of the actual moisture of dried Goji berries, the predicted moisture was obtained based on the partial least squares (PLS) algorithm and a prediction model for the moisture of dried goji berries was established. It was found that the moisture of dried Goji berries was responsive to the NIR hyperspectral imager. The established prediction model could accurately predict the moisture of dried goji berries, and its R2-value was 0.9981. The results provide a theoretical basis for the design of non-destructive moisture-detecting equipment for dried Goji berries.

    DOI: 10.3390/horticulturae10030302

    Scopus

  14. Investigation of the effects of tableting parameters on reliable quantitative terahertz spectroscopy 査読有り

    Su Y., Xu Y., Wang H., Ma T., Tsuchikawa S., Inagaki T.

    Applied Physics A: Materials Science and Processing   130 巻 ( 2 )   2024年2月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Applied Physics A: Materials Science and Processing  

    Particle size ratio, tablet thickness, and compaction pressure are three important tableting parameters that affect the obtained tablet spectrum. In this study, the single-factor test and response surface analysis (RSM) were adopted to examine how these three parameters and their interactions affect the analytical measurements performed over terahertz time-domain spectroscopy (THz-TDS). Tablet samples were composed of a different percent (wt-%) of acetylsalicylic acid within microcrystalline cellulose. Results indicate that change in absorption coefficient was found to be more obvious for a larger particle size ratio. Thinner tablets were sensitive to absorption coefficient effects created as the transmitted THz radiation propagates through the tablet interfaces. Compression pressure has a limited effect on the absorption coefficient. The particle size ratio had the largest effect on the coefficient of correlation of the quantitative regression model, followed by the compaction pressure, and the tablet thickness. In this study, the optimized tableting parameters were determined: tablet thickness of 0.48 mm, particle size ratio of about 1:1, and compaction pressure of 30 MPa. Under this condition, the R2 of the quantitative regression model of acetylsalicylic acid content was 0.971 and 0.998 at the range of acetylsalicylic acid mass fraction between 10 and 90 wt-%, 1 and 30 wt-%, respectively. This study provides a method to effectively reduce the scattering effect of spectral detection of tablets by improving the sample’s properties, to provide a reference for enhancing the reliability and accuracy of quantitative measurements.

    DOI: 10.1007/s00339-024-07302-3

    Scopus

  15. Primary assessment of macronutrients in durian (CV Monthong) leaves using near infrared spectroscopy with wavelength selection 査読有り

    Phanomsophon T., Jaisue N., Worphet A., Tawinteung N., Khurnpoon L., Lapcharoensuk R., Krusong W., Pornchaloempong P., Sirisomboon P., Inagaki T., Ma T., Tsuchikawa S.

    Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy   304 巻   2024年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy  

    Farmers would be able to regulate fertilization and produce quality durian if they knew the nutrient concentration in durian leaves. A long period of time for traditional nutritional content determination is needed. Therefore, near-infrared spectroscopy is a good method for nondestructive and quick nutrient content evaluation. The leaf sample matrices (fresh leaves, dried ground leaves, and dried ground leaf pellets) were scanned by Fourier transform near-infrared (FT-NIR) with a wavelength of 12,500–3,600 cm−1. Regression models were developed using partial least squares (PLS) with full wavelength, short wavelength, and selected wavelength by successive projections algorithm (SPA). In this study, the model for N and K concentration was acceptable and the prediction was considered good but for P content not had succeeded. As a result, the PLS-SPA model using fresh leaf samples for evaluating N content in durian leaves exhibited performance of r2 = 0.852, SEP = 0.14%, RPD = 2.63 and bias = −0.020%. The PLS-SPA model using dried ground leaf samples for evaluating K content in durian leaves exhibited performance of r2 = 0.820, SEP = 0.13%, RPD = 2.36 and bias = 0.006%. This research found that it is possible to apply NIR waves to predict N and K concentrations in durian leaves. It is not necessary to predict directly from the wavelengths associated with -N or -K bonds. Instead, NIR can measure them indirectly from the bonding of proteins, which are products formed by N and K. In addition, selecting the wavelength that is related to the value to be measured can produce results that are not significantly different from using full or short wavelengths. These models can assist farmers in rapidly predicting N and K content in durian leaves for immediate fertilizer adjustment.

    DOI: 10.1016/j.saa.2023.123398

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  16. Validation Study on the Practical Accuracy of Wood Species Identification via Deep Learning from Visible Microscopic Images 査読有り

    Ma T., Kimura F., Tsuchikawa S., Kojima M., Inagaki T.

    BioResources   19 巻 ( 3 ) 頁: 4838 - 4851   2024年

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:BioResources  

    This study aimed to validate the accuracy of identifying Japanese hardwood species from microscopic cross-sectional images using convolutional neural networks (CNN). The overarching goal is to create a versatile model that can handle microscopic cross-sectional images of wood. To gauge the practical accuracy, a comprehensive database of microscopic images of Japanese hardwood species was provided by the Forest Research and Management Organization. These images, captured from various positions on wood blocks, different trees, and diverse production areas, resulted in substantial intra-species image variation. To assess the effect of data distribution on accuracy, two datasets, D1 and D2, representing a segregated and a non-segregated dataset, respectively—from 1,000 images (20 images from each of the 50 species) were compiled. For D1, distinct images were allocated to the training, validation, and testing sets. However, in D2, the same images were used for both training and testing. Furthermore, the influence of the evaluation methodology on the identification accuracy was investigated by comparing two approaches: patch evaluation and E2 image evaluation. The accuracy of the model for uniformly sized images was approximately 90%, whereas that for variably sized images it was approximately 70%.

    DOI: 10.15376/biores.19.3.4838-4851

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  17. Validation study on light scattering changes in kiwifruit during postharvest storage using time-resolved transmittance spectroscopy 査読有り

    Ma T., Inagaki T., Tsuchikawa S.

    Scientific Reports   13 巻 ( 1 )   2023年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Scientific Reports  

    Visible and near-infrared spectroscopy has been well studied for characterizing the organic compounds in fruit and vegetables from pre-harvest to late harvest. However, due to the challenge of decoupling of optical properties, the relationship between the collected samples’ spectral data and their properties, especially their mechanical properties (e.g., firmness, hardness, and resilience) is hard to understand. This study developed a time-resolved transmittance spectroscopic method to validate the light scattering changing characteristics in kiwifruit during shelf-life and in cold storage conditions. The experimental results demonstrated that the reduced scattering coefficient (μs′) of 846 nm inside kiwifruit decreased steadily during postharvest storage and is more evident under shelf-life than in cold storage conditions. Moreover, the correlation between the μs′ and the storage time was confirmed to be much higher than that using the external color indexes measured using a conventional colorimeter. Furthermore, employing time-resolved profiles at this single wavelength, an efficacious mathematical model has been successfully formulated to classify the stages of kiwifruit softening, specifically early, mid-, and late stages. Notably, classification accuracies of 84% and 78% were achieved for the shelf-life and cold storage conditions, respectively.

    DOI: 10.1038/s41598-023-43777-5

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  18. Thermal behavior of heat-treated wood using two-dimensional correlation of near-infrared spectroscopy and differential scanning calorimetry 査読有り

    Mahdiyanti S.H., Inagaki T., Ridho M.R., Marsoem S.N., Tsuchikawa S.

    Wood Science and Technology   57 巻 ( 6 ) 頁: 1485 - 1506   2023年11月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Wood Science and Technology  

    Heat treatment of wood can decrease its heat capacity and thermal transitions, which are thermal behavior properties of wood. A calorimetric study that highlights the thermal behavior of the molecular mobility of materials is necessary to investigate the thermal degradation of wood. Furthermore, combining it with a nondestructive measurement technique would widen its scope of applicability, especially for wood in service or historical wood that cannot be altered or damaged by invasive methods. Neolamarckia cadamba (Roxb.) Bosser, also known as burflower-tree, a tropical fast-growing hardwood species that has become popular for light-construction works in the past decade, is treated at 90, 120, and 150 ℃ for a duration of 8 h to 3.5 months, scheduled logarithmically. Near-infrared spectroscopy and differential scanning calorimetry (DSC) were used to measure the chemical changes and thermal behavior of the wood before and after heat treatment. Two-dimensional correlation spectroscopy (2DCOS) analysis was then applied to assess the NIR second-derivative spectra and DSC thermograms. The results showed that 2DCOS analysis could assess NIR second-derivative spectra and DSC thermograms under careful observation, as DSC thermograms comprise both qualitative and quantitative information. It provides a new point of view in the non-destructive analysis of wood thermal degradation.

    DOI: 10.1007/s00226-023-01506-1

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  19. Fit-free analysis of fluorescence lifetime imaging data using chemometrics approach for rapid and nondestructive wood species classification 査読有り

    Ma T., Inagaki T., Tsuchikawa S.

    Holzforschung   77 巻 ( 9 ) 頁: 724 - 733   2023年9月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    Conventional fluorescence spectroscopy has been suggested as a valuable tool for classifying wood species rapidly and non-destructively. However, because it is challenging to conduct absolute emission intensity measurements, fluorescence analysis statistics are difficult to obtain. In this study, another dimension of fluorescence, that is, fluorescence lifetime, was further evaluated to address this issue. A time-resolved fluorescence spectroscopic measurement system was first designed, mainly using a streak camera, picosecond pulsed laser at 403 nm, and a spectroscope, to collect the fluorescence time-delay (FTD) profiles and steady-state fluorescence intensity (FI) spectra simultaneously from 15 wood species. For data analysis, principal component analysis was used to "compress"the mean-centered FTD and FI spectra. Then, support vector machine classification analysis was utilized to train the wood species classification model based on their principal component scores. To avoid overfitting, ten-fold cross-validation was used to train the calibration model using 70 % of the total samples, and the remaining 30 % hold-out validation was used to test its reproducibility. The cross-validation accuracies were 100 % (5 softwoods) and 96 % (10 hardwoods), with test-validation accuracies of 96 % and 89 %.

    DOI: 10.1515/hf-2023-0017

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    その他リンク: https://www.degruyter.com/document/doi/10.1515/hf-2023-0017/pdf

  20. Development of a sensitivity-enhanced chlorophyll fluorescence lifetime spectroscopic method for nondestructive monitoring of fruit ripening and postharvest decay 査読有り

    Ma T., Inagaki T., Tsuchikawa S.

    Postharvest Biology and Technology   198 巻   2023年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Postharvest Biology and Technology  

    Nondestructive monitoring of the environmental changes around fluorescent molecules in postharvest fruit is highly informative for monitoring their ripening and early decay process. In this study, a time-resolved laser-induced fluorescence (TRLIF) spectroscopic system, including a streak camera, spectrometer, and 403 nm picosecond-pulsed laser, was first developed. Then, representative pigments in photosynthesis (chlorophyll a, chlorophyll b, and carotenoids liquid samples) were initially measured and studied to determine whether the developed TRLIF spectroscopic system could produce the characteristics of chlorophyll fluorescence decay traces. Finally, the same approach was tested to monitor the ripening and early decay processes of each three samples of avocado and strawberry. The overall findings demonstrated that the fluorescence lifetime (FLT) of the fruit samples declined steadily during the shelf-life storage. For the avocados samples, the average FLT loss at the wavelength range of 706–749 nm decreased by approximately 23 % and 31 % at 1 and 2 d under shelf-life storage, respectively. For the strawberry samples, the average FLT loss at the wavelength range of 631–706 nm decreased by approximately 22 %, 46 %, 68 %, and 73 % at 0.5, 1, 1.5, and 2 d under the same shelf-life storage condition. This study indicates that the developed TRLIF spectroscopic method is potentially robust and accurate for assessing the ripening and early decay process of various climacteric and non-climacteric fruit.

    DOI: 10.1016/j.postharvbio.2022.112231

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  21. Visualization of Sugar Content Distribution of White Strawberry by Near-Infrared Hyperspectral Imaging 査読有り

    Seki H., Ma T., Murakami H., Tsuchikawa S., Inagaki T.

    Foods   12 巻 ( 5 )   2023年3月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Foods  

    In this study, an approach to visualize the spatial distribution of sugar content in white strawberry fruit flesh using near-infrared hyperspectral imaging (NIR-HSI; 913–2166 nm) is developed. NIR-HSI data collected from 180 samples of “Tochigi iW1 go” white strawberries are investigated. In order to recognize the pixels corresponding to the flesh and achene on the surface of the strawberries, principal component analysis (PCA) and image processing are conducted after smoothing and standard normal variate (SNV) pretreatment of the data. Explanatory partial least squares regression (PLSR) analysis is performed to develop an appropriate model to predict Brix reference values. The PLSR model constructed from the raw spectra extracted from the flesh region of interest yields high prediction accuracy with an RMSEP and (Formula presented.) values of 0.576 and 0.841, respectively, and with a relatively low number of PLS factors. The Brix heatmap images and violin plots for each sample exhibit characteristics feature of sugar content distribution in the flesh of the strawberries. These findings offer insights into the feasibility of designing a noncontact system to monitor the quality of white strawberries.

    DOI: 10.3390/foods12050931

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    PubMed

  22. Review of near infrared hyperspectral imaging applications related to wood and wood products 査読有り

    Schimleck L., Ma T., Inagaki T., Tsuchikawa S.

    Applied Spectroscopy Reviews   58 巻 ( 9 ) 頁: 585 - 609   2023年

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    記述言語:英語   出版者・発行元:Applied Spectroscopy Reviews  

    Hyperspectral imaging is a technique that combines spectroscopy and imaging. Originally utilized in the 1980’s by the remote sensing community it is now utilized in a wide variety of applications. Spectral imaging was first used for the detection of compression wood in the late 1990’s and since that time research focused on wood and wood products has steadily increased with a variety of applications reported. While there are several reviews of wood related research utilizing near infrared spectrometers a comprehensive summary of wood—hyperspectral imaging research is lacking. Near infrared hyperspectral imaging systems (NIR-HSI) typically have a wavelength range of 900–1700 nm, whereas short-wave infrared hyperspectral imaging (SWIR-HSI) systems range from 1000 to 2500 nm. We provide a detailed account of the various studies that have been published utilizing both camera types.

    DOI: 10.1080/05704928.2022.2098759

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  23. Experimental study and three-dimensional modeling of moisture transport in wood by means of near-infrared hyperspectral imaging coupled with a heat and mass transfer simulation method 査読有り

    Ma T., Morita G., Inagaki T., Tsuchikawa S.

    Holzforschung   76 巻 ( 8 ) 頁: 699 - 710   2022年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    Substantial efforts have been undertaken for visualizing and simulating the characteristics of water movement in wood. However, three-dimensional (3D) thermo-hygric simulations still pose challenges, not only because wood has a heterogeneous microstructure that results in complex computational models but also because there is a lack of proper experimental techniques to support and validate the model constructions. In this study, the moisture distribution in wood during the water adsorption and desorption processes was first visualized using a near-infrared hyperspectral imaging (NIR-HSI) method that has high resolution, sensibility, and stability. Then, based on the moisture visualization results, the main parameters of a mass transfer simulation code were varied. The visualization and simulation results were confirmed to match well with the main characteristics; e.g., drying speed was slower in the wood parts with higher densities. Additionally, there was a relatively large gradient over the surface layer of the wood samples as the drying progressed, whereas this was not an obvious feature in the water adsorption process. Hence, this study proposes that the NIR-HSI method can be combined with thermo-hygric and 3D simulation model construction. Such an approach provides the basis for optimizing drying conditions and providing high-quality wood products.

    DOI: 10.1515/hf-2021-0203

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  24. Cognitive spectroscopy for the classification of rice varieties: A comparison of machine learning and deep learning approaches in analysing long-wave near-infrared hyperspectral images of brown and milled samples 査読有り

    Onmankhong J., Ma T., Inagaki T., Sirisomboon P., Tsuchikawa S.

    Infrared Physics and Technology   123 巻   2022年6月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Infrared Physics and Technology  

    Rapid and non-destructive detection of genuine Thai Jasmine rice (Khao Dawk Mali 105 (KDML105)) from Pathum Thani1 (PTT1) and Phitsanulok2 (PSL2) under either milled or brown conditions is required to disrupt fraudulent. This study aimed to resolve this real issue using long-wave near infrared hyperspectral imaging (NIR-HSI) coupled with machine learning and deep learning approaches. The best classification accuracy for the milled rice was achieved using the spectral imaging-based analysis on the NIR-HSI data with selected wavelength, approximately 95% for the test set either by convolutional neural network or support vector machine (SVM), whereas for the brown rice, the SVM model based on the averaged NIR spectra could achieve the best classification accuracy of 95.4%. It suggests the chemical component difference and its spatial distribution in the milled rice could contribute higher classification accuracy. Additionally, the surface bran effects of brown rice could be reduced by using averaged spectral data coupled with the SVM method.

    DOI: 10.1016/j.infrared.2022.104100

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  25. Production of Nanocellulose Film from Abaca Fibers 査読有り

    Lapuz A.R., Tsuchikawa S., Inagaki T., Ma T., Migo V.

    Crystals   12 巻 ( 5 ) 頁: 601   2022年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Crystals  

    Abaca fibers were subjected to a TEMPO mediated oxidation to extract nanocellulose on a 500 L capacity locally fabricated reactor. A yield of 46.7% white gel material with 2.23% solid content was obtained from an overnight reaction. Transmission electron microscopy scan of the white gel material confirms the production of relatively short highly individualized cellulose nanofibril (CNF) as the diameter of abaca fiber was reduced from 16.28 µm to 3.12 nm with fiber length in the range of 100 nm to 200 nm. Nanocellulose film was prepared using air drying (CNF-VC) and vacuum oven drying (CNF-OD). The effect of CNF concentration on the physical, morphological, thermal and mechanical properties were evaluated. FTIR spectra showed cellulose I spectra between abaca fiber with both the CNF-VC film and CNF-OD film with two distinct peaks at 1620 cm−1 and 1720 cm−1 attributed to the carboxyl group resulting from the TEMPO oxidation. In addition, the carboxyl group decreases in thermal stability of cellulose. Moreover, the XRD scan showed a decrease in crystallinity index of CNF films compared to abaca fibers. CNF-VC film showed the highest tensile strength at 0.4% concentration with 88.30 MPa, while a 89.72 MPa was observed for CNF-OD film at 0.8% concentration.

    DOI: 10.3390/cryst12050601

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  26. Rapid and nondestructive prediction of firmness, soluble solids content, and pH in kiwifruit using Vis–NIR spatially resolved spectroscopy 査読有り

    Ma T., Zhao J., Inagaki T., Su Y., Tsuchikawa S.

    Postharvest Biology and Technology   186 巻   2022年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Postharvest Biology and Technology  

    This paper reports an evaluation of firmness, soluble solids content (SSC), and acidity (pH) in kiwifruit using a newly designed visible–near-infrared (Vis–NIR) spatially resolved spectroscopic (SRS) system. The system mainly comprises a cost-effective Vis–NIR hyperspectral imaging camera, a halogen light source, and 36 light-receiving silica fibers which were divided into six groups (1, 2, 3, 4, 5, and 10 mm away from the light illumination) used to collect diffusely reflected light from sample surface. During the experiment, time-resolved spectroscopy (TRS) was used to validate the light scattering characteristics at a single wavelength of 846 nm by transmission measurement, which differed from the reflectance measurement of the SRS system. The TRS results show that firmer kiwifruits tended to have a lower transmitted light intensity and a higher full width at half maximum value. The SRS results indicate that the reflected light intensity decreased more with an increased distance from the illumination spot in firmer kiwifruits. The results of the two methods supported the same view, i.e., firmer kiwifruit indicated higher degrees of light scattering inside. Following on, the calibration models for kiwifruit properties were constructed using the SRS data coupled with partial least squares regression analysis. Finally, the prediction accuracies were benchmarked against standard diffuse reflectance spectroscopy using one fiber group position of the same SRS system. The overall results showed the benefits of using the SRS system to predict fruit firmness by enhancing light scattering effects and predicting the SSC required for reducing such effects.

    DOI: 10.1016/j.postharvbio.2022.111841

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  27. Application of near-infrared spectroscopy to agriculture and forestry 査読有り

    Tsuchikawa S., Ma T., Inagaki T.

    Analytical Sciences   38 巻 ( 4 ) 頁: 635 - 642   2022年4月

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    担当区分:最終著者   記述言語:英語   出版者・発行元:Analytical Sciences  

    Depending on the uniformity of the quality attribute within agricultural products, there is often a need to develop non-destructive and efficient evaluation methods to assure their qualities. Near-infrared spectroscopy (NIRS) is a well-suited method to characterize organic compounds, particularly when coupled with multivariate analysis methods. This review article introduces scientific and technical reports using the NIRS to evaluate food, agriculture, and forest products. Overall, basic spectroscopic research is continuously progressing; indeed, in combination with big-data information technology and spectral imaging techniques, material analysis is improving to maximize performance. Portable and low-cost devices have also been designed and produced, enabling remote analysis. Future advancements are expected to result in its applications in even more fields for online or at-line quality monitoring. Graphical abstract: [Figure not available: see fulltext.]

    DOI: 10.1007/s44211-022-00106-6

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  28. Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose: cellulose I to cellulose II, tracing the structural changes under chemical treatment 査読有り

    Wang H., Kataoka H., Tsuchikawa S., Inagaki T.

    Cellulose   29 巻 ( 6 ) 頁: 3143 - 3151   2022年4月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cellulose  

    Terahertz time-domain spectroscopy (THz-TDS) has expanded possibilities in cellulose crystallography research, as THz radiation detects most intermolecular vibrations and responds to the phonons of crystalline lattices. In this study, we traced the transformation of the cellulose crystalline lattice from cellulose I to cellulose II by THz-TDS and X-ray powder diffraction. Cellulose II was obtained by treating cellulose I with NaOH of different concentrations (0 wt%–20 wt%, at 2 wt% intervals). The THz absorption coefficient spectra of cellulose II showed three characteristic peaks (at 1.32 THz, 1.76 THz, and 2.77 THz). The THz absorption coefficient spectra of cellulose II treated with 20-wt% NaOH and cellulose I without NaOH treatment were fitted by a seventh-order Fourier series. Thus, the THz absorption coefficient spectra of samples treated with NaOH of other concentrations could be considered a combination of these two fitted profiles of cellulose I and cellulose II, multiplied by different coefficients. Furthermore, the coefficients could reflect the relative contents of cellulose I and cellulose II in the samples.

    DOI: 10.1007/s10570-022-04493-x

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  29. Moisture transport dynamics in wood during drying studied by long-wave near-infrared hyperspectral imaging 査読有り

    Ma T., Morita G., Inagaki T., Tsuchikawa S.

    Cellulose   29 巻 ( 1 ) 頁: 133 - 145   2022年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cellulose  

    The complexities of wood microstructure cause difficulties in understanding water movement characteristics during drying. Here, the water transport dynamics in softwood (Japanese cypress) with different sample lengths (30 mm, 60 mm, and 90 mm) and various drying temperatures (30 °C, 60 °C, and 90 °C) were studied using a rapid and high-resolution moisture content (MC) mapping method based on long-wave near-infrared hyperspectral imaging (NIR-HSI). The observations of this study are as follows: slow drying at approximately 30 °C, the area near the subsurface of the wood samples tends to have higher MC than the central parts during drying, especially in the case of longer wood samples. For drying at higher temperatures, strongly bonded water appeared at the surface areas much earlier, which could easily cause sample deformation and cracking. Overall, the experimental results suggest the capillary effects could play a major role at the first stage of slow drying at fiber level; then, the transfers between bound and free water could play a significant power source in the second drying stage. It is expected that this study will be of help in providing a basis to study and simulate the drying characteristics of cellular and hydrophilic materials.

    DOI: 10.1007/s10570-021-04290-y

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  30. Cognitive spectroscopy for the classification of rice varieties: A comparison of machine learning and deep learning approaches in analysing long-wave near-infrared hyperspectral images of brown and milled samples 査読有り 国際共著

    Jiraporn Onmankhong, Te Ma, Tetsuya Inagaki*, Panmanas Sirisomboon, Satoru Tsuchikawa

    Infrared Physics and Technology   123 巻   頁: 104100   2022年

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    担当区分:責任著者   記述言語:英語  

  31. Near-infrared spectroscopy and hyperspectral imaging can aid in the prediction and mapping of polyploid acacia hybrid wood properties in tree improvement programs 査読有り

    Viet D.D., Ma T., Inagaki T., Kim N.T., Tsuchikawa S.

    Holzforschung   75 巻 ( 12 ) 頁: 1067 - 1080   2021年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    Acacia, including Acacia hybrids, are some of the most important species grown as part of the Vietnamese wood industry. Rapid methods to identify the variations in the wood properties of Acacia hybrids however, are a currently lacking and creating limits for their breeding programs. In this study, nine Acacia hybrid clones, including those that were diploid, triploid, and tetraploid were evaluated using near-infrared spectroscopy (NIR) and hyperspectral imaging (HSI). The standard normal variate (SNV) and second derivative (SP2D) were applied to compare the performances of NIR and HSI using partial least square regression. The HSI images were acquired at wavelengths from 1033 to 2230 nm and the SNV and SP2D described the variations in the wood properties. The NIR predicted the wood physical properties better than HSI, while they provided similar predictions for the mechanical properties. The mapping results showed low densities around the pith area and high densities near the bark. They also revealed that the air-dry moisture content changed at different positions within a disk and was dependent on its position within the tree. Overall, NIR and HSI were found to be potential wood property prediction tools, suitable for use in tree improvement programs.

    DOI: 10.1515/hf-2021-0024

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  32. Measuring the tensile strain of wood by visible and near-infrared spatially resolved spectroscopy 査読有り

    Ma T., Inagaki T., Yoshida M., Ichino M., Tsuchikawa S.

    Cellulose   28 巻 ( 17 ) 頁: 10787 - 10801   2021年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cellulose  

    Strain measurement is critical for wood quality evaluation. Using conventional strain gauges constantly is high cost, also challenging to measure precious wood materials due to the use of strong adhesive. This study demonstrates the correlation between the light scattering degrees inside the wood during tension testing and their macroscopic strain values. A multifiber-based visible-near-infrared (Vis–NIR) spatially resolved spectroscopy (SRS) system was designed to rapidly and conveniently acquire such light scattering changes. For the preliminary experiment, samples with different thicknesses, from 2 to 5 mm, were measured to evaluate the influence of sample thickness. The differences in Vis–NIR SRS spectral data diminished with an increase in sample thickness, suggesting that the SRS method can successfully measure the wood samples' whole strain (i.e., surface and inside). Then, for the primary experiment, 18 wood samples were each prepared with approximately the same sample thickness of 2 mm and 5 mm to construct strain calibration models, respectively. The prediction accuracy of the 2-mm samples was characterized by a determination coefficient (R2) of 0.81 with a root mean squared error (RMSE) of 343.54 με for leave-one-out cross-validation; for test validation, the validation accuracy was characterized by an R2 of 0.76 and an RMSE of 395.35 με. For the validation accuracy of the 5-mm samples, R2val was 0.69 with 440.78 με RMSEval. Overall, the presented calibration results of the SRS approach were confirmed to be superior to the standard diffuse reflectance spectroscopy.

    DOI: 10.1007/s10570-021-04239-1

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  33. Parameter optimization of vibrating and comb‐brushing harvesting of lycium barbarum l. Based on fem and rsm 査読有り

    Zhao J., Ma T., Inagaki T., Chen Y., Hu G., Wang Z., Chen Q., Gao Z., Zhou J., Wang M., Tsuchikawa S., Chen J.

    Horticulturae   7 巻 ( 9 )   2021年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Horticulturae  

    The current mechanical harvesting methods of Lycium barbarum L. are labor intensive and cause too much damage, but vibrating and comb‐brushing harvesting can increase the efficiency while minimizing the damage. However, optimizing the main factors and their parameter values of vibrating and comb‐brushing harvesting is challenging. To achieve the high‐efficiency and low‐damage harvesting of L. barbarum, firstly, the mechanical models of the materials used in the experiments were established based on the physical tests. Then, the vibrating and comb‐brushing harvesting simulations were conducted based on FEM to acquire the ranges of the parameter values. The effects of the rotating speed, material, and amplitude on the harvesting rate of ripe fruit and harvesting rate of unripe fruit, as well as the damage rate of ripe fruit were determined based on RSM. Finally, the optimized parameters were obtained and verified using the field experiments. The field experiments showed that the harvesting rate of ripe fruit was 85.8%, the harvesting rate of unripe fruit was 10.5%, and the damage rate of ripe fruit was 9.7%. The findings provided the optimal parameter values, which were a design basis for the vibrating and comb‐brushing harvesters of L. barbarum.

    DOI: 10.3390/horticulturae7090286

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  34. Finite element method simulations and experiments of detachments of lycium barbarum l. 査読有り

    Zhao J., Ma T., Inagaki T., Chen Q., Gao Z., Sun L., Cai H., Chen C., Li C., Zhang S., Tsuchikawa S., Chen J.

    Forests   12 巻 ( 6 )   2021年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Forests  

    When harvesting Lycium barbarum L., excess amounts of detachments of the half-ripe fruit, unripe fruit, flowers, and leaves significantly affect the yield and adversely affect the subsequent processing, such as drying and grading. Finite element method (FEM) simulations and experiments of detachments were performed to harvest more ripe fruit and less half-ripe fruit, unripe fruit, flowers, and leaves. Three-dimensional (3D) models of the ripe fruit, half-ripe fruit, unripe fruit, flowers, leaves, fruit calyxes (flower calyx), fruit stems (flower stem), and branches were constructed using a 3D scanner, and material mechanics models of the above parts were established based on physical tests with universal testing machines. Detachment simulations and experiments of the ripe fruit, half-ripe fruit, unripe fruit, flowers, and leaves were performed to determine the detachment mechanisms and sequences. The detachment forces of each set of two parts were obtained. The field experiments showed that the detachment force between the fruit and calyx of ripe fruit was the lowest value of these forces, and only the ripe fruit was the first to detach from the calyx when harvesting. The results provided data support on the mechanics properties of wood and the optimization basis for the harvesting method of L. barbarum.

    DOI: 10.3390/f12060699

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  35. Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose: the potentiality of being a new standard for evaluating crystallinity 査読有り

    Wang H., Tsuchikawa S., Inagaki T.

    Cellulose   28 巻 ( 9 ) 頁: 5293 - 5304   2021年6月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cellulose  

    Given that terahertz (THz) radiation responds to intermolecular forces such as hydrogen bonds, THz time-domain spectroscopy (THz-TDS) has expanded possibilities in cellulose research. In this study, THz-TDS was used to investigate the crystallinity of three types of cellulose-based materials. Microcrystalline cellulose (MCC) and wood were ball milled at different times, and pseudo-wood was a mixture of MCC and lignin of different mass fractions. All the samples showed peaks at 3.04 THz in the THz mass absorption coefficient spectra. Further, the spectra from 2.79 THz to 3.32 THz were cut out and detrended by subtraction from a baseline. The integrated intensity of the detrended spectra showed a correlation with the mass fraction of lignin of the pseudo-wood samples, and ball milling time of the MCC and wood samples. The correlation was similar with the crystallinity index calculated from X-ray powder diffraction. Moreover, the original wood sample without ball milling had an integrated intensity that was about 30% that of the original MCC sample, matching with the cellulose concentration of the wood (about 30% to 40%). We normalized the integrated intensity of 2.79 THz to 3.32 THz into 1 to 0 by a min–max algorithm and proposed a new “index” for evaluating crystallinity.

    DOI: 10.1007/s10570-021-03902-x

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  36. Demonstration of the applicability of visible and near-infrared spatially resolved spectroscopy for rapid and nondestructive wood classification 査読有り 国際共著

    Ma T., Inagaki T., Tsuchikawa S.

    Holzforschung   75 巻 ( 5 ) 頁: 419 - 427   2021年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    Although visible and near-infrared (Vis-NIR) spectroscopy can rapidly and nondestructively identify wood species, the conventional spectrometer approach relies on the aggregate light absorption due to the chemical composition of wood and light scattering originating from the physical structure of wood. Hence, much of the work in this area is still limited to further spectral pretreatments, such as baseline correction and standard normal variate to reduce the light scattering effects. However, it should be emphasized that the light scattering rather than absorption inwood is dominant, and thismust be effectively utilized to achieve highly accurate and robust wood classification. Here a novelmethod based on spatially resolved diffuse reflectance (wavelength range: 600-1000 nm) was demonstrated to classify 15 kinds of wood. A portable Vis-NIR spectral measurement system was designed according to previous simulations and experimental results. To simplify spectral data analysis (i.e., against overfitting), support vector machine (SVM) model was constructed for wood sample classification using principal component analysis (PCA) scores. The classification accuracies of 98.6% for five-fold crossvalidation and 91.2%for test set validation were achieved. This study offers enhanced classification accuracy and robustness over other conventional nondestructive approaches for such various kinds of wood and sheds light on utilizing visible and short-wave NIR light scattering for wood classification.

    DOI: 10.1515/hf-2020-0074

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  37. Rapid and nondestructive evaluation of hygroscopic behavior changes of thermally modified softwood and hardwood samples using near-infrared hyperspectral imaging (NIR-HSI) 査読有り 国際共著

    Ma T., Schimleck L., Inagaki T., Tsuchikawa S.

    Holzforschung   75 巻 ( 4 ) 頁: 345 - 357   2021年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    The objective of this work was to provide a rapid and nondestructive imaging method for evaluating the hygroscopic behavior of thermally modified lignocellulosic materials (softwood and hardwood). The difference in the hygroscopic behavior was explained by moisture content (MC) mapping results and molecular association characteristics of absorbed water (i.e. weakly, moderately, and strongly hydrogen-bonded water molecules) with wood at various relative humidities (RH). To achieve this goal, near-infrared (NIR) spectral images in the wavelength range 1816-2130 nm (covering the combination of stretching and deformation vibrations for OH) were used to visualize MC distributions over the surface of Japanese cedar and European beech samples which had been thermally treated at different temperatures. A curve fitting method was utilized to explore changes in water-wood structure characteristics based on shifts to longer wavelength in spectral signals caused by increasing MC. The curve fitting results support the recent nuclear magnetic resonance (NMR) studies that different bound water stabilities may pool in different compartments of the wood cell wall. Furthermore, water was firmly bound to wood at low RHs and H-bonds gained mobility as the number of absorbed molecules increased. It is concluded that NIR hyperspectral imaging also has the potential to be a complementary methodology for studying the transient changes of wood-water interactions before equilibrium.

    DOI: 10.1515/hf-2019-0298

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  38. Non-destructive and fast method of mapping the distribution of the soluble solids content and pH in kiwifruit using object rotation near-infrared hyperspectral imaging approach 査読有り

    Ma T., Xia Y., Inagaki T., Tsuchikawa S.

    Postharvest Biology and Technology   174 巻   2021年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Postharvest Biology and Technology  

    This work aimed to offer a non-destructive and fast approach to visualizing the soluble solids content (SSC) and acidity (pH) of the whole kiwifruit. Most of the visible-near-infrared spectral imaging techniques used in postharvest fruit and vegetables assessment exhibit issues related to the identification of the quality spatial distribution within intact samples, mainly due to sampling surface curvature effects. Here, a push-broom-type NIR hyperspectral imaging camera and a sample rotation stage were combined to scan entire kiwifruit surfaces. Then, key wavelengths in the range of 1002–2300 nm were extracted for constructing SSC and pH calibration models by partial least squares regression analysis. The resulting SSC prediction accuracy was sufficiently high: the coefficient of determination (R2cv) and the root mean square error (RMSEcv) of cross-validation set were 0.74 and 0.7 %, respectively. For pH, the R2cv and RMSEcv were 0.64 and 0.14, respectively. Finally, the SSC and pH 360˚mapping results surpassed earlier works in this area that they showed a distinct spatial distribution within each intact sample. It was concluded that the proposed object rotation hyperspectral imaging approach is promising for the non-destructive prediction mapping of SSC and pH in kiwifruit or other cylindrical-shaped samples.

    DOI: 10.1016/j.postharvbio.2020.111440

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  39. Rapid and nondestructive evaluation of soluble solids content (SSC) and firmness in apple using Vis–NIR spatially resolved spectroscopy 査読有り 国際共著

    Ma T., Xia Y., Inagaki T., Tsuchikawa S.

    Postharvest Biology and Technology   173 巻   2021年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Postharvest Biology and Technology  

    Visible–near infrared (Vis–NIR) spectroscopy is a rapid and nondestructive method used to characterize organic compounds in postharvest fruit and vegetable assessment. However, developing robust calibration models is a challenge as conventional spectrometers collect only the cumulative effects of light absorption and scattering. In this study, a multifiber-based Vis–NIR spatially resolved spectra measurement system was designed for simultaneous evaluation of soluble solid content (SSC) and firmness in apple. Thirty silica fibers separated into five groups at 1, 2, 3, 4, and 5 mm away from the light illumination point and connected to a cost-effective Vis–NIR hyperspectral imaging camera were used to acquire spectral data with an improved signal-to-noise ratio (S/N) by a two-step signal averaging process (i.e., 30 camera pixels per fiber and six optical fibers per group). Reflectance ratio spectra were then calculated by dividing the diffusely reflected light intensity detected at distance d +△ by that detected at distance d to realize a light reference-free approach. Finally, the useful explanatory variables were selected by competitive adaptive reweighted sampling (CARS) to construct individual calibration models for various regions. The coefficients of determination (Rcal2) and the root mean square errors (RMSEcal) of the best-performing calibration models were approximately 0.97 and 0.20 % for SSC and 0.96 and 0.37 N for firmness, respectively. Furthermore, the predicted results were 0.92 and 0.35 % for SSC and 0.87 and 0.71 N for firmness. Our method offers low-cost and portable detection of SSC and firmness for postharvest fruit evaluation.

    DOI: 10.1016/jpostharvbio.2020.111417

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  40. Non-destructive and fast method of mapping the distribution of the soluble solids content and pH in kiwifruit using object rotation near-infrared hyperspectral imaging approach 査読有り 国際共著

    T. Ma, Y. Xia, T. Inagaki, S. Tsuchikawa

    Post Harvest Biology and Technology   174 巻   頁: 111440   2021年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  41. Simultaneous detection of density, moisture content and fiber direction of wood by THz time-domain spectroscopy 査読有り

    Kashima M., Tsuchikawa S., Inagaki T.

    Journal of Wood Science   66 巻 ( 1 )   2020年12月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Wood Science  

    In the wood product-manufacturing process, the physical properties of wood must be monitored. The terahertz (THz) radiation has a high potential for sensing and imaging wood with a good spatial resolution. This study demonstrates the simultaneous prediction of the density, moisture content, and fiber direction of wood, which are important in determining the wood quality, using THz time-domain spectroscopy. We measured the spectra of 12 kinds of wood at various moisture contents while rotating the sample against the THz wave polarization. The fiber direction was predicted by observing the birefringence, which is the optical property of a material, in which the refractive index depends on the polarization direction. The density and the moisture content were predicted by multiple linear regression using the refractive indices and absorption coefficients obtained from the THz measurement. In a series of THz measurements, we successfully identified the wood fiber direction with an R2 of 0.90 and a root mean square error (RMSE) of 16.51° (total measured range = 0–170°), the density with an R2 of 0.97 and an RMSE of 0.022 (total measured range = 0.25–0.67 g/cm3), and the moisture content with an R2 of 0.78 and an RMSE of 4.06 (total measured range = 0.00–30.98%).

    DOI: 10.1186/s10086-020-01874-3

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  42. Wooden Material and Environmental Sciences 査読有り

    Ma T., Tsuchikawa S., Inagaki T.

    Near-Infrared Spectroscopy: Theory, Spectral Analysis, Instrumentation, and Applications     頁: 361 - 379   2020年11月

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    担当区分:最終著者   掲載種別:論文集(書籍)内論文   出版者・発行元:Near-Infrared Spectroscopy: Theory, Spectral Analysis, Instrumentation, and Applications  

    Near-infrared spectroscopy (NIRS) is suitable for both the qualification and quantification of organic properties associated with C-H, O-H, or N-H groups. There have been considerable efforts made toward proposing and developing various technologies and devices for the rapid and nondestructive measurement of various samples related to natural materials and environmental sciences. In this chapter, the utilizations of NIRS in the fields of wood material, soil, sediment, waste liquid, atmospheric gas detection, and archeological science will be explained through some representative studies.

    DOI: 10.1007/978-981-15-8648-4_16

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  43. Time-of-Flight Spectroscopy 査読有り

    Inagaki T., Tsuchikawa S.

    Near-Infrared Spectroscopy: Theory, Spectral Analysis, Instrumentation, and Applications     頁: 265 - 275   2020年11月

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    担当区分:筆頭著者   掲載種別:論文集(書籍)内論文   出版者・発行元:Near-Infrared Spectroscopy: Theory, Spectral Analysis, Instrumentation, and Applications  

    This chapter summarizes the principle and application of time-of-flight (TOF) NIR spectroscopy, which can evaluate the contribution of scattering and absorption of light in samples simultaneously. In order to construct robust calibrations for organic materials by NIR spectroscopy, it is important to evaluate and understand the spectral contribution from light absorption (absorption resulting from harmonics or overtones of the fundamental absorptions of molecular vibrations) and light scattering (mainly due to the cellular structure). In this chapter,we introduce the principle of TOF-NIR spectroscopy and some applications to agricultural, medical area, and forest products.

    DOI: 10.1007/978-981-15-8648-4_11

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  44. Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose 査読有り

    Wang H., Horikawa Y., Tsuchikawa S., Inagaki T.

    Cellulose   27 巻 ( 17 ) 頁: 9767 - 9777   2020年11月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cellulose  

    Terahertz (THz) radiation is responsive to optical phonons in crystal lattices; therefore, THz time-domain spectroscopy (THz-TDS) has potential utility in crystallographic analysis. In this study, THz-TDS was used to investigate cellulose samples extracted from different sources with varying ratios of Iα and Iβ fractions. This is the first study to report that the absorption coefficient in the THz region of cellulose Iα and Iβ presents different characteristic absorption peaks around 2 THz. This can be used to distinguish the cellulose I allomorph, which exhibits differences in its crystalline structure. The absorption coefficient at 2.11 and 2.38 THz showed a considerable linear correlation with the Iα fraction of the cellulose samples. The absorption coefficient spectra of 1.88–3.40 THz were further detrended and separated into three Gaussian peaks. The correlations between the parameters of these separated peaks (integrated intensities, peak positions) and the crystalline structural values (d-spacing, crystalline size, crystallinity index) that calculated from the X-ray diffraction (XRD) pattern were investigated.

    DOI: 10.1007/s10570-020-03508-9

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  45. Rapid and non-destructive seed viability prediction using near-infrared hyperspectral imaging coupled with a deep learning approach 査読有り

    Ma T., Tsuchikawa S., Inagaki T.

    Computers and Electronics in Agriculture   177 巻   2020年10月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Computers and Electronics in Agriculture  

    Seeds are the basis of the agricultural food industry, greater insights into seed viability before sowing could improve storage management and field performance. In the present study, we aimed to address this issue by using highly cost-efficient near-infrared hyperspectral imaging (NIR-HSI) and a convolutional neural network (CNN) deep learning approach. An NIR-HSI camera was used because it can recognize both molecular vibration information (i.e. chemical component differences) and its spatial distribution in each seed sample; this camera is much more informative than a regular RGB digital camera. Using this technology, the emphasis of this study was firstly to provide a methodology for enhancing the interpretability of viable and non-viable seeds via principal component analysis (PCA) and support vector machine (SVM) viability classification analysis of NIR-HSI data. A CNN was then constructed to“cognize” the differences in viable and non-inviable seeds and classify them automatically. Experimental results indicate that the methodology produces a ~90% classification accuracy for both a five-fold cross-validation set and a test set of naturally aged Japanese mustard spinach seeds. Therefore, this study provides a new strategy for effective and practical seed viability prediction.

    DOI: 10.1016/j.compag.2020.105683

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  46. Physical and mechanical properties of fast growing polyploid acacia hybrids (A. auriculiformis x A. mangium) from Vietnam 査読有り 国際共著

    Viet D.D., Ma T., Inagaki T., Kim N.T., Chi N.Q., Tsuchikawa S.

    Forests   11 巻 ( 7 )   2020年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Forests  

    Acacia plants are globally important resources in the wood industry, but particularly in Southeast Asian countries. In the present study, we compared the physical and mechanical properties of polyploid Acacia (3x and 4x) clones with those of diploid (2x) clones grown in Vietnam. We randomly selected 29 trees aged 3.8 years from different taxa for investigation. BV10 and BV16 clones represented the diploid controls; X101 and X102 were the triploid clones; and AA-4x, AM-4x, and AH-4x represented neo-tetraploid families of Acacia auriculiformis, Acacia mangium, and their hybrid clones. The following metrics were measured in each plant: stem height levels, basic density, air-dry equilibrium moisture content, modulus of rupture (MOR), modulus of elasticity (MOE), compression strength, and Young's modulus. We found that the equilibrium moisture content significantly differed among clones, and basic density varied from pith-to-bark and in an axial direction. In addition, the basic density of AA-4x was significantly higher than that of the control clones. Furthermore, the MOR of AM-4x was considerably lower than the control clones, whereas the MOE of X101 was significantly higher than the control values. The compression strength of AM-4x was significantly lower than that of the control clones, but AH-4x had a significantly higher Young's modulus. Our results suggest that polyploid Acacia hybrids have the potential to be alternative species for providing wood with improved properties to the forestry sector of Vietnam. Furthermore, the significant differences among the clones indicate that opportunities exist for selection and the improvement of wood quality via selective breeding for specific properties.

    DOI: 10.3390/f11070717

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  47. Rapidly visualizing the dynamic state of free, weakly, and strongly hydrogen-bonded water with lignocellulosic material during drying by near-infrared hyperspectral imaging 査読有り

    Ma T., Inagaki T., Tsuchikawa S.

    Cellulose   27 巻 ( 9 ) 頁: 4857 - 4869   2020年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cellulose  

    Real-time monitoring of the dynamic state of water molecular structure in lignocellulosic material is challenging, but important for both theoretical studies and industrial applications. In the present study, three typical wood samples which have a fundamental difference in the anatomical structure were scanned in the near-infrared spectral range, and images were acquired from wavelengths of 1002–1847 nm during drying. Then, partial least squares regression was used to determine the water content by mass, and principal component analysis was utilized to characterize the variance of NIR difference spectral data between 1340 and 1610 nm after baseline correlation for showing the distribution changing from free water to bound water during air drying. It was clarified that the PC1 loading mainly correlates with simple water content by mass, whereas the PC2 loading contains information about water–wood hydrogen structure interactions. The three loading curve peaks of PC2 could be correlated with free, weakly bound, and strongly bound water based on longer wavelength shifting. Finally, PC1 and PC2 scores were comprehensively applied to show the distribution changing from free water to bound water in each wood sample with a 62.5 μm/pixel high spatial resolution.

    DOI: 10.1007/s10570-020-03117-6

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  48. Simultaneous detection of density, moisture content and fiber direction of wood by THz-time domain spectroscopy 査読有り

    M. Kashima, S. Tsuchikawa, T. Inagaki

    Journal of Wood Science   66 巻   頁: 27   2020年4月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  49. Cognitive spectroscopy for wood species identification: Near infrared hyperspectral imaging combined with convolutional neural networks 査読有り

    Kanayama H., Ma T., Tsuchikawa S., Inagaki T.

    Analyst   144 巻 ( 21 ) 頁: 6438 - 6446   2019年11月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Analyst  

    From the viewpoint of combating illegal logging and examining wood properties, there is a contemporary demand for a wood species identification system. Several nondestructive automatic identification systems have been developed, but there is room for improvement to construct a highly reliable model. The present study proposes cognitive spectroscopy that combines near infrared hyperspectral imaging (NIR-HSI) with a deep convolutional neural network approach. We defined "cognitive spectroscopy" as a protocol that extracts features from complex spectroscopic data and presents the best results without human intervention. Overall, 120 samples representing 38 hardwood species were scanned using an NIR-HSI camera. A deep learning prediction model was built based on the principal component (PC) images obtained from the PC scores of hyperspectral images (wavelength range: 1000-2200 nm at approximately 6.2 nm interval). The results showed that the accuracy of wood species identification based on 6PC (PC1-PC6) images was 90.5%, which was considerably higher than the accuracy of 56.0% obtained with conventional visible images.

    DOI: 10.1039/c9an01180c

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  50. Analysis of wood thermal degradation using 2D correlation of near infrared and visible-light spectroscopy 査読有り

    Mahdiyanti S., Inagaki T., Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   27 巻 ( 5 ) 頁: 354 - 369   2019年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Near Infrared Spectroscopy  

    Wood changes its properties, especially color, as a result of thermal degradation. In this study, change in wood properties due to thermal degradation have been studied using the nondestructive test methods of near infrared spectroscopy, CIELAB color measurement, visible-light spectroscopy, and Arrhenius time–temperature superposition. Arrhenius time–temperature superposition allowed analysis of near infrared and visible-light spectra, and color parameters to predict thermal degradation and color change of wood at 120–180℃ for 6 min to nine months duration. Two-dimensional correlation spectroscopy for the complementary analysis of near infrared and visible-light spectroscopy was applied to investigate chemical changes during wood thermal degradation that cause the observed color change. Visible-light spectroscopy with CIELAB color measurement was used to obtain information on color changes, and near infrared spectroscopy was applied in the measurement of chemical changes during thermal degradation. Changes in spectral intensities in 2D correlation spectroscopy indicated that different chemical components are responsible for color change during heat treatment and accelerated aging of wood. With dry-thermal treatment, the hemicellulose content decreased following a color change, whereas cellulose and lignin/extractives decreased with hygro-thermal treatment.

    DOI: 10.1177/0967033519863878

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  51. Electrode polarization effects on interfacial kinetics of ionic liquid at graphite surface: An extended lagrangian-based constant potential molecular dynamics simulation study 査読有り

    Inagaki Taichi, Nagaoka Masataka

    JOURNAL OF COMPUTATIONAL CHEMISTRY   40 巻 ( 24 ) 頁: 2131 - 2145   2019年9月

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    記述言語:日本語  

    DOI: 10.1002/jcc.25865

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  52. Three-dimensional grain angle measurement of softwood (Hinoki cypress) using near infrared spatially and spectrally resolved imaging (NIR-SSRI) 査読有り

    Ma T., Inagaki T., Tsuchikawa S.

    Holzforschung   73 巻 ( 9 ) 頁: 817 - 826   2019年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    As the strength of wood is greatly affected by its three-dimensional (3D) grain angles (the dive angle and the surface angle), the wood industry today requires automatic, rapid, and robust measurement techniques for measuring them simultaneously. In the present study, a near infrared spatially and spectrally resolved imaging (NIR-SSRI) system was designed in a line scan model, mainly including an NIR hyperspectral imaging camera and a halogen spotlight source (Ø 1 mm). Spatially resolved diffuse reflectance images at three target wavelengths (1002 nm, 1217 nm, and 1413 nm) were obtained from Hinoki cypress [Chamaecyparis obtusa (Siebold & Zucc.) Endl.] samples at various (0°, 3°, 6°, ⋯ 45°) dive angles and surface angles (0°, 3°, 6°, ⋯ 45°). The scattering patterns caused by the "tracheid effect" were almost elliptical. Subsequently, nonlinear least squares fitting was used to determine their eccentricities (e) and rotation angles (θ). The e values at each selected wavelength were highly correlated with the dive angle reference values; and the global identification model developed using Gaussian process regression (GPR) under five-fold cross-validation (CV) reached a determination coefficient (r2) of 0.98 with a root mean square error (RMSE) of 2.2°. On the other hand, local surface angle identification models developed using linear regression analysis achieved determination coefficients higher than 0.90 on r2 and an RMSE of CV lower than 3.8° when the dive angle was lower than 30°.

    DOI: 10.1515/hf-2018-0273

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  53. Determination of Dielectric Function of Water in THz Region in Wood Cell Wall Result in an Accurate Prediction of Moisture Content 査読有り

    Wang H., Inagaki T., Hartley I., Tsuchikawa S., Reid M.

    Journal of Infrared, Millimeter, and Terahertz Waves   40 巻 ( 6 ) 頁: 673 - 687   2019年6月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Infrared, Millimeter, and Terahertz Waves  

    This report follows up previous work that presented a model for the simultaneous detection of moisture content and density of wood using Terahertz time-domain spectroscopy. A significant improvement in the prediction accuracy of the model is demonstrated by including a moisture content-dependent dielectric function for the water within the wood samples. Justification for using the dielectric function is presented, the prediction accuracy is quantified, and the results compared with prior work.

    DOI: 10.1007/s10762-019-00594-0

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  54. A new approach based on a combination of capacitance and near-infrared spectroscopy for estimating the moisture content of timber 査読有り

    Tham V.T.H., Inagaki T., Tsuchikawa S.

    Wood Science and Technology   53 巻 ( 3 ) 頁: 579 - 599   2019年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wood Science and Technology  

    The moisture content (MC) of wood influences its material properties. Determination of MC is essential in both the research and manufacturing fields. This study examined a nondestructive method for estimating MC rapidly and effectively. A capacitance sensor and a near-infrared (NIR) spectrometer were used to measure the MC of Japanese cedar and Japanese cypress timber. High-frequency capacitance (20 MHz) and NIR spectral absorption (908–1676 nm) data were collected for cross section and tangential section, as well as for the whole-sample average, in two MC ranges: from the green to the fiber saturation point (FSP) and from FSP to air-dried state. The results indicated that when standard error of prediction (SEP) is compared, the performance in [FSP to air-dried state] was better; when coefficient of determination in cross-validation (R2val) and residual predictive deviation in cross-validation (RPDval) were compared, the performance in [Green to FSP] was better. val Statistical analysis was performed using multiple linear regression and partial least squares. Combining capacitance and NIR absorbance at two wavelengths (Capacitance + NIR-MLR calibration) from the green to FSP was the best calibration yielding the most promising results: R2val= 0.96, SEP = 5.20% and RPDval = 4.97 on the cross section of samples. The results were higher than those of other calibrations in R2 and SEP and RPD values. The NIR-PLS calibration performed better than others with quite good R2, lower SEP and higher RPD in the MC range from FSP to airdried state. The first calibration using only capacitance of wood was good in the first range of MC, but it is not good in the second range (R2 under 0.5). Depending on the MC range, the performance of each calibration was different. In both MC ranges, the results on the cross section were higher than on the tangential section due to the anisotropic characteristics of wood material. From Capacitance + NIR-MLR calibration, the predicted models were developed using multiple linear regression and logarithmic regression. Results suggest the possibility of developing a new portable device combining a capacitance sensor and NIR spectroscopy to accurately predict the MC of wood.

    DOI: 10.1007/s00226-019-01077-0

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  55. Near infrared estimation of concentration of ginsenosides in Asian ginseng 査読有り

    Inagaki T., Katayama N., Cho R., Chen X., Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   27 巻 ( 2 ) 頁: 115 - 122   2019年4月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Near Infrared Spectroscopy  

    In this study, the feasibility of near infrared reflectance spectroscopy for the quality evaluation of the main bioactive compounds, ginsenosides, in Panax ginseng was examined. Second derivative NIR spectra of standard reagents of ginsenoside Rg1, Re, Rb1, Rc, Rb2 and Rd were used for analysis. Characteristic bands were observed at around 5250 cm−1 in the spectra of ginsenoside Rg1 group (including Rg1 and Re); however, this was not to be observed on the spectra of ginsenoside Rb1 group (including Rb1, Rc, Rb2 and Rd). PLS regression models were constructed of air-dry ginseng powder samples and ginsenoside content in ginsengs was determined by HPLC methods. The calibration models covered various types of ginseng (white ginseng, red ginseng and bleached ginseng) from various cultivated areas (Japan, China and Korea) and were well established for each kind of ginsenoside. It was shown that NIR spectroscopy can be used for the accurate prediction of ginsenoside.

    DOI: 10.1177/0967033518814851

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  56. Rapid identification of wood species by near-infrared spatially resolved spectroscopy (NIR-SRS) based on hyperspectral imaging (HSI) 査読有り

    Ma T., Inagaki T., Ban M., Tsuchikawa S.

    Holzforschung   73 巻 ( 4 ) 頁: 323 - 330   2019年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    Conventional near-infrared (NIR) spectroscopy has shown its potential to separate wood species nondestructively based on the aggregate effect of light absorption and scattering values. However, wood has an aligned microstructure, and there is a large refractive index (RI) mismatch between the wood cell wall substance (na1.55) and the cell lumen (aira1.0, watera1.33). Light scattering is dominant over absorption (sa a) ({\mu '-s} \gg {\mu -a}) in wood, and this fact can be utilized for complex classification purposes. In this study, an NIR hyperspectral imaging (HSI) camera combined with one focused halogen light source (Ø 1 mm) was designed to evaluate the light scattering patterns of five softwood (SW) and 10 hardwood (HW) species in the wavelength range from 1002 to 2130 nm. Several parameters were combined to improve the data quality, such as image histogram plots of defined spaced bins (associated with diffuse reflectance values of light), variance calculation on the frequency (the number of pixels in each bin) of each histogram and the principal component analysis (PCA) of all the variance values at each wavelength. The identification accuracy of the quadratic discriminant analysis (QDA) under the five-fold cross-validation method was 94.1, based on the first three principal component (PC) scores.

    DOI: 10.1515/hf-2018-0128

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  57. Determination of carotenoids and dobi content in crude palm oil by spectroscopy techniques: Comparison of raman and ft-nir spectroscopy 査読有り

    Nokkaew R., Punsuvon V., Inagaki T., Tsuchikawa S.

    International Journal of GEOMATE   16 巻 ( 55 ) 頁: 92 - 98   2019年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:International Journal of GEOMATE  

    Crude palm oil (CPO) is a rich source of carotenoids which are a precursor of vitamin A as an important antioxidant. Carotenoids and Deterioration Of Bleachability Index (DOBI) are important factors to indicated quality of CPO. The conventional method for DOBI and carotenoids determination use UV-Vis spectrophotometry and HPLC, respectively which methods use solvents and spend time for analysis. This research interests Raman and FT-NIR spectroscopy for carotenoids and DOBI determination due to those techniques are an alternative technique for rapid measurement, non-destruction of material, and environmental suitability. The results indicated that Raman is better for determination than FT-NIR spectrometry. In Raman analysis, multiplicative scatter correction (MSC) and standard normal variate (SNV) treated methods were the best models for carotenoids and DOBI, respectively. The bands of carotenoids were at 1,100 and 1,500 cm-1 wavenumber. Validation on carotenoids produced 0.94 of correlation coefficient (R), 0.88 of coefficient of determination (R2), 40.65 ppm of root mean square error of prediction (RMSEP) and 3.25 of the ratio of standard error of prediction to standard deviation (RPD). The validation of DOBI produced 0.76 of R, 0.57 of R2, 0.31 of RMSEP, 1.92 of RPD of 1.92. The limitation of carotenoids and DOBI determination using FT-NIR is having sufficient concentration of carotenoids for analysis. In addition, data for various samples regarding location, season, and oil palm species are important to build models for precise prediction.

    DOI: 10.21660/2019.55.4813

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  58. Effect of knots and holes on the modulus of elasticity prediction and mapping of sugi (Cryptomeria japonica) veneer using near-infrared hyperspectral imaging (NIR-HSI) 査読有り

    Sofianto I., Inagaki T., Ma T., Tsuchikawa S.

    Holzforschung   73 巻 ( 3 ) 頁: 259 - 268   2019年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    Naturally occurring knots reduce the mechanical strength of wood. Veneers from sugi (Cryptomeria japonica) served as research material to study the effect of knots and holes. Veneer samples were first subjected to a three-point bending test to obtain measured modulus of elasticity (MOE) values. Then, near-infrared (NIR) hyperspectral imaging (HSI) was used to construct a prediction model and map the predicted MOE values. This is the first attempt for MOE prediction from the entire veneer surface based on NIR-HSI technology, while the mathematical part relies on chemometrics and cross-validation partial least squares regression (CV-PLSR). Maps of MOE prediction values could distinguish between latewood (LW) and earlywood (EW), as well as between a sound knot and a dead knot.

    DOI: 10.1515/hf-2018-0060

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  59. Non-destructive evaluation of wood stiffness and fiber coarseness, derived from SilviScan data, via near infrared hyperspectral imaging 査読有り

    Ma T., Inagaki T., Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   26 巻 ( 6 ) 頁: 398 - 405   2018年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Near Infrared Spectroscopy  

    Near infrared hyperspectral imaging combined with partial least squares regression analysis was used to evaluate wood stiffness (modulus of elasticity) and fiber coarseness. Five samples with normal wood and compression wood collected from two Japanese Cedar (Cryptomeria japonica) trees were analyzed. To achieve high reliability of the prediction values, a SilviScan system (X-ray densitometry, X-ray diffractometry, and optical microscopy) with the high spatial resolution was used for measuring reference data. The measurement interval for modulus of elasticity and fiber coarseness was 1µm and 25 µmm, respectively. After spectral pre-treatment and key wavelengths selection, partial least squares analysis was applied to calibrate near infrared data to reference values. The determination coefficient (RCV2) of modulus of elasticity was 0.66 with a root mean square error of cross validation (RMSECV) of 1.80 GPa. For the constructed fiber coarseness calibration model, RCV2 and RMSECV were 0.62 and 35.02 µmm/g, respectively. Finally, modulus of elasticity and fiber coarseness mapping results show detailed information (156 µmm/pixel) at the grown ring level. The differences among earlywood, latewood, and compression wood were all well identifiable.

    DOI: 10.1177/0967033518808053

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  60. Inspection of Microfibril Angle of Sugi Wood by THz-TDS 査読有り

    Wang H., Tsuchikawa S., Inagaki T.

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   2018-September 巻   2018年10月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz  

    Wood as a biological material has large differences in individual properties, and terahertz time-domain spectroscopy (THz-TDS) provide a new possibility for the wood products industry since THz exhibits high transparency to wood with big birefringence and diattenuation. By using the complex refractive index and absorption coefficient, THz is excepted to estimate important properties such as fiber orientation, microfibril angle (MFA) etc. simultaneously. In this study, sugi was used as sample because of its simple structure. Density and moisture content were predicted by using the real part of complex refractive index combined with absorption coefficient and showed a high correlation between measured and predicted values, prediction of MFA is still an ongoing mission.

    DOI: 10.1109/IRMMW-THz.2018.8510303

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  61. Optical characteristics of Douglas fir at various densities, grain directions and thicknesses investigated by near-infrared spatially resolved spectroscopy (NIR-SRS) 査読有り

    Ma T., Schajer G., Inagaki T., Pirouz Z., Tsuchikawa S.

    Holzforschung   72 巻 ( 9 ) 頁: 789 - 796   2018年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    A near-infrared spatially resolved spectroscopy (NIR-SRS) system, also called the hyperspectral imaging system, was applied in a line scanning model combined with a concentrated halogen light source (Ø 1 mm), and spatially resolved reflectance images of Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] wood were obtained. The samples with various densities, grain directions and thicknesses were observed in the NIR range of 1000-1600 nm. Then, a nonlinear curve-fitting algorithm was applied based on the steady-state diffusion theory model to estimate the absorption coefficient (μa), and reduced scattering coefficients (μ′s μ) both parallel and perpendicular to the grain direction at each measurement position. The absorption scattering coefficients at 1457 nm and two kinds of reduced scattering coefficients at 1002 nm were highly correlated with wood densities measured by an X-ray densitometer. The correlation coefficients were 0.953 and 0.987 for 3 mm and 5 mm samples, respectively, while three optical profiles were combined. It can be concluded that NIR-SRS is a fast and simple method for measuring the optical characteristics of softwood, although it has a non-homogeneous cellular structure. Sub-surface density and grain direction could be predicted with satisfactory accuracy based on a few key wavelengths without relying on multivariate statistical analysis.

    DOI: 10.1515/hf-2017-0213

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  62. Determination of physical and chemical properties and degradation of archeological Japanese cypress wood from the Tohyamago area using near-infrared spectroscopy 査読有り

    Inagaki T., Yonenobu H., Asanuma Y., Tsuchikawa S.

    Journal of Wood Science   64 巻 ( 4 ) 頁: 347 - 355   2018年8月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Wood Science  

    Here, we evaluated the application of near-infrared (NIR) spectroscopy for estimating the degradation level of archeological wood samples from the Tohyamago area, the dendrochronological ages of which were also determined. The wood samples were radially cut from three logs obtained from the Tohyamago area. NIR reflectance spectra were measured from the tangential faces of air- and oven-dried wood samples using a Fourier transform NIR spectrophotometer. The second derivative spectra within the wavenumber range of 6400–5200 cm−1, in which the effect of moisture content in wood is suspected to be insignificant, showed a characteristic behavior with age. By comparing the second derivative spectral change in our wood samples with that in wood degraded by aging, thermal treatment, fungal attack, and lightning reported in the literature, we found that the second derivative spectra of wood samples from one log was similar to those of wood degraded by hygro-thermal treatment, whereas those of wood samples from another log was similar to those of wood degraded by brown-rot fungi. The physical and chemical properties of archeological wood were well predicted using a combination of partial least square regression analysis and NIR spectroscopy.

    DOI: 10.1007/s10086-018-1718-8

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  63. Noncontact evaluation of soluble solids content in apples by near-infrared hyperspectral imaging 査読有り

    Ma T., Li X., Inagaki T., Yang H., Tsuchikawa S.

    Journal of Food Engineering   224 巻   頁: 53 - 61   2018年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Food Engineering  

    Near-infrared (NIR) hyperspectral imaging was used to evaluate soluble solids content (SSC) in ‘Fuji’ apples [Malus sylvestris (L.) Mill. var. domestica (Borkh. Mansf.)]. Eighty ‘Fuji’ apples were analyzed by collecting four small block samples from each one (approximately 2.0 cm × 2.0 cm × 1.5 cm). Partial least squares (PLS) regression analysis was performed to determine the relation between SSC reference data and NIR spectral data measured from each sample. The cross-validation coefficient of determination (r2) between predicted and measured SSC values is 0.89 with a root mean squared error of cross-validation (RMSECV) of 0.55%. Then, we successfully mapped SSC at a high spatial resolution (375 μm per pixel). In addition, the absorption and reduced scattering coefficients of the measured samples were determined based on a diffusion theory model. The absorption coefficients are positively correlated to the SSC values (chemical information), whereas water cored tissue content (physical information) causes a characteristic change in light scattering coefficients. The fitting results were validated by Monte Carlo simulation, and the light penetration depth in ‘Fuji’ apples was estimated to be around 0.33 cm at 1198 nm and 0.17 cm at 1450 nm, respectively.

    DOI: 10.1016/j.jfoodeng.2017.12.028

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  64. Selective assessment of duplex heat-treated wood by near-infrared spectroscopy with principal component and kinetic analyses 査読有り

    Inagaki T., Asanuma Y., Tsuchikawa S.

    Journal of Wood Science   64 巻 ( 1 ) 頁: 6 - 15   2018年2月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Wood Science  

    We selectively assessed the thermal and hygrothermal treatment times of duplex heat-treated samples from the softwood hinoki cypress (Chamaecyparis obtusa) and the hardwood Japanese zelkova (Zelkova serrata) using near-infrared (NIR) spectroscopy with principal component analysis (PCA) and spectral-kinetic analysis. Wood samples from each species were thermally or hygrothermally treated at 120, 130, 150, and 180 °C, and the second-derivative spectra of these samples in the 6300–5450 cm−1 range, where moisture content has the smallest effect, were then subjected to PCA. The master curve that was calculated by kinetic analysis successfully explained changes in the first principal component (PC1) scores with thermal treatment time for all temperatures. The angles between the PC1 loadings that explained the spectral variation due to thermal and hygrothermal treatment were 79° for hinoki and 80° for zelkova. Thus, calculation of the inner product between the second-derivative spectra of duplex heat-treated wood and a loading vector that explained the spectral variation due to thermal or hygrothermal treatment allowed us to selectively assess the thermal and hygrothermal treatment times.

    DOI: 10.1007/s10086-017-1670-z

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  65. Effect of cellular structure on the optical properties of wood 査読有り

    Ban M., Inagaki T., Ma T., Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   26 巻 ( 1 ) 頁: 53 - 60   2018年2月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Near Infrared Spectroscopy  

    To construct robust calibrations of wood properties by near infrared spectroscopy, one must independently evaluate the spectral contributions of light absorption and light scattering. However, the light propagation in wooden cellular structures is difficult to interpret because these structures are complex, heterogeneous, and anisotropic. This study investigates the reduced scattering coefficients of softwood and hardwood (with ring-porous or diffuse-porous vessels) at 846 nm by time-resolved spectroscopy. It also evaluates the effect of wooden cellular structure and air-dry density on the light propagation. After determining the reduced scattering coefficients, we observed cross-sectional microscopic images of the wood samples. Eighty-five percent of the variation in the reduced scattering coefficients was explainable by the air-dry density, area ratio of the cell wall, and the median pore area. Monte Carlo simulations of the light propagation through wood revealed that most of the photon transport occurs in the cell-wall substance.

    DOI: 10.1177/0967033518757233

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  66. A novel combined application of capacitive method and near-infrared spectroscopy for predicting the density and moisture content of solid wood 査読有り

    Tham V.T.H., Inagaki T., Tsuchikawa S.

    Wood Science and Technology   52 巻 ( 1 ) 頁: 115 - 129   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wood Science and Technology  

    The use of a capacitive method and near-infrared (NIR) spectroscopy to simultaneously predict the density and moisture content (MC) of wood samples was investigated. Prediction accuracy of both methods was individually investigated by multivariate analyses. The capacity and absorbance at two wavelengths in the NIR range were combined to predict both the properties by the specific models. All wavelength combinations in the range of 908–1676 nm were tested, and the best combination yielding the highest coefficient of determination (R2) was chosen. This novel method showed a strong correlation between predicted and measured data, independent of sample thickness and wood species. The prediction accuracy of the wood samples, from green wood to oven-dried conditions, showed promising results for all thicknesses, with R2 = 0.79, root-mean-square error of cross-validation (RMSECV) = 0.10 g/cm3, and residual predictive deviation (RPD) = 2.22 for density and R2 = 0.80, RMSECV = 25.70%, and RPD = 2.22 for MC. In the case of below fiber saturation point to oven-dried state, R2 value was slightly decreased in the prediction of MC and slightly increased in the prediction of density, but RMSECV of MC declined significantly (maximum 5.46%) compared to the range of MC from saturated point (maximum 39.56%). These results were considerably better than those obtained by modeling the capacitive or NIR method individually, and improvement was particularly apparent in estimating density. The results suggest the possibility of a new device combining the capacitive method and NIR spectroscopy to predict density and MC more accurately.

    DOI: 10.1007/s00226-017-0974-x

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  67. Near-infrared hyperspectral imaging for classification of mung bean seeds 査読有り

    Phuangsombut K., Ma T., Inagaki T., Tsuchikawa S., Terdwongworakul A.

    International Journal of Food Properties   21 巻 ( 1 ) 頁: 799 - 807   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:International Journal of Food Properties  

    Hard mung bean seeds pose a problem in the sprouting process as they develop mold and infect neighboring seeds. Near-infrared hyperspectral imaging combined with partial least squares discriminant analysis was applied to develop a classifying model to separate hard mung beans from normal ones. The orientation of the measured beans was found to affect the classification result. The optimal partial least squares discriminant analysis model based on all orientations resulted in a correlation coefficient (R) of 0.919 with a root mean squared error of prediction of 0.197. The non-germinative parts were mapped and were concentrated at one end of the bean. Finally, a germinability index was proposed according to the proportion of colored areas between the germinative and non-germinative parts from the hyperspectral imaging results.

    DOI: 10.1080/10942912.2018.1476378

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  68. Quality Evaluation of Engineered Wood by THz-TDS 査読有り

    Kashima M., Tsuchikawa S., Inagaki T.

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   2018-September 巻   2018年

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz  

    This study attempts simultaneous prediction of grain angle, density and moisture content by THz time domain spectroscopy (THz-TDS) which has sufficient spatial resolution and transparency for wood. Terahertz waves transmitted through wood contain information on moisture content, density, grain angle and crystallinity of the sample. In this study, we measured spectra of 14 kinds of wood (5 soft wood, 9 hard woods) at various moisture contents and air-dried douglas fir while rotating the sample against the polarization of the terahertz wave. It was shown that the fiber orientation, density and moisture content of wood can be predicted simultaneously from the calculated complex permittivity.

    DOI: 10.1109/IRMMW-THz.2018.8510155

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  69. Dynamic behavior of wood chemical components under drying process measured by near infrared spectroscopy 査読有り

    Sugii S., Fujimoto T., Tsutsumi H., Inagaki T., Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   25 巻 ( 6 ) 頁: 400 - 406   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Near Infrared Spectroscopy  

    This study examined the dynamic behavior of wood chemical components during the drying process using near infrared spectroscopy. Principal component analysis and generalized two-dimensional correlation spectroscopy were applied to identify significant absorption bands from the heavily overlapping near infrared spectra. The near infrared spectra were successively acquired over the moisture content range of 60-11%. The principal component analysis scores indicated that the wood-water interaction in the moisture content range of 60-46% significantly differed from that in the range of 45-11%. The synchronous 2D correlation spectrum constructed from the spectra in the moisture content range of 60-46% revealed that the cell wall components and water molecules responded to the drying process even though the wood exceeded the fiber saturation point. In the moisture content range of 45-11%, the H-bonded OH groups in the crystalline region of cellulose clearly increased with the decrease in bound water. Moreover, the sequential order of events was also clarified from the asynchronous spectrum.

    DOI: 10.1177/0967033517733379

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  70. High-resolution and non-destructive evaluation of the spatial distribution of nitrate and its dynamics in spinach (Spinacia oleracea l.) leaves by near-infrared hyperspectral imaging 査読有り

    Yang H.Y., Inagaki T., Ma T., Tsuchikawa S.

    Frontiers in Plant Science   8 巻   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Frontiers in Plant Science  

    Nitrate is an important component of the nitrogen cycle and is therefore present in all plants. However, excessive nitrogen fertilization results in a high nitrate content in vegetables, which is unhealthy for humans. Understanding the spatial distribution of nitrate in leaves is beneficial for improving nitrogen assimilation efficiency and reducing its content in vegetables. In this study, near-infrared (NIR) hyperspectral imaging was used for the non-destructive and effective evaluation of nitrate content in spinach (Spinacia oleracea L.) leaves. Leaf samples with different nitrate contents were collected under various fertilization conditions, and reference data were obtained using reflectometer apparatus RQflex 10. Partial least squares regression analysis revealed that there was a high correlation between the reference data and NIR spectra (r2 = 0.74, root mean squared error of cross-validation = 710.16 mg/kg). Furthermore, the nitrate content in spinach leaves was successfully mapped at a high spatial resolution, clearly displaying its distribution in the petiole, vein, and blade. Finally, the mapping results demonstrated dynamic changes in the nitrate content in intact leaf samples under different storage conditions, showing the value of this non-destructive tool for future analyses of the nitrate content in vegetables.

    DOI: 10.3389/fpls.2017.01937

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  71. The effect of path length, light intensity and co-Added time on the detection limit associated with NIR spectroscopy of potassium hydrogen phthalate in aqueous solution 査読有り

    Inagaki T., Watanabe T., Tsuchikawa S.

    PLoS ONE   12 巻 ( 5 ) 頁: e0176920   2017年5月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PLoS ONE  

    Near infrared (NIR) spectroscopy is a common means of non-invasively determining the concentrations of organic compounds in relatively transparent aqueous solutions. Rigorous determination for limit of detection (LOD) is of importance for the application use of NIR spectroscopy. The work reported herein determined the LOD with the analysis of potassium hydrogen phthalate (KHP) in water with partial least square (PLS) calibration in the range of 6300±5800 cm-1 between the two strong absorption bands of water, in which the C-H overtone bands of KHP are located. A comparison of the LOD estimated when using various condition (path length, aperture and co-Added scan times) showed that the lowest LOD for KHP obtained with a fiber optic cable attachment equipped NIR spectrometer is approximately 150 ppm.

    DOI: 10.1371/journal.pone.0176920

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  72. Calibration of SilviScan data of Cryptomeria japonica wood concerning density and microfibril angles with NIR hyperspectral imaging with high spatial resolution 査読有り

    Ma T., Inagaki T., Tsuchikawa S.

    Holzforschung   71 巻 ( 4 ) 頁: 341 - 347   2017年4月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Holzforschung  

    Wood density and microfibril angle (MFA) are strongly correlated with wood stiffness, swelling/shrinkage, and its anisotropy. Understanding the spatial distribution of these data is critical for solid timber applications. In this study, near-infrared (NIR) hyperspectral imaging has been calibrated for evaluation of wood density and MFA in an effective manner. Briefly, five wood samples collected from both normal wood (NW) and compression wood (CW) moieties of two different Cryptomeria japonica trees were analyzed. Partial least squares (PLS) regression analysis was performed to determine the relationship between X-ray densitometry data obtained by SilviScan and NIR spectra, and cross-validation (leave-one-out) approach served for prediction performances. The validation coefficient of determination (r2) between the predicted densities by the NIR technique and the X-ray data was 0.83 with a root mean squared error of cross-validation (RMSECV) of 105.2 kg m-3. Regarding MFA, the r2 was 0.77 and RMSECV 5.36°. Wood density was successfully maped as well as the MFA at a high spatial resolution. As a result, the detection of annual growth ring features and evaluation of aspects of heterogeneous wood quality has been facilitated. The mapping results were visually checked by looking at the difference between earlywood (EW) and latewood (LW) for density and by means of the Mäule color reaction indicating high lignin contents in CW in terms of MFA validation as CWs have high MFA values.

    DOI: 10.1515/hf-2016-0153

    Web of Science

    Scopus

  73. Classification of mung bean seeds for sprout production using near-infrared spectroscopy and hyperspectral imaging 査読有り

    K. Phuangsombut, A. Terdwongworakul, N. Suttiwijitpukdee, A. Phuangsombut, S. Tsuchikawa, T. Inagaki, T. Ma

      23 巻   頁: 23-29   2017年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  74. Stiffness and moisture content prediction model of wooden veneer using fast online near-infrared (NIR) spectroscopic system 査読有り

    Forestry Research and Engineering: International Journal   1 巻   頁: 00006   2017年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  75. Modulus of elasticity prediction model on sugi (Cryptomeria japonica) lumber using online near-infrared (NIR) spectroscopic system 査読有り 国際共著

    International Wood Products Journal   8 巻   頁: 193 - 200   2017年

     詳細を見る

    記述言語:英語  

  76. Modulus of elasticity prediction model on sugi (Cryptomeria japonica) lumber using online near-infrared (NIR) spectroscopic system 査読有り

    Sofianto I.A., Inagaki T., Kato K., Itoh M., Tsuchikawa S.

    International Wood Products Journal   8 巻 ( 4 ) 頁: 193 - 200   2017年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:International Wood Products Journal  

    In this study, static bending measurements and online NIR spectra acquisitions were combined to construct modulus of elasticity (MOE) prediction model for sugi lumber. NIR spectra were acquired from tangential surface of sugi lumbers at a speed of 120 m min−1 to assess its effectiveness in the wood industry. Cross-validation partial least squares regression (CV-PLSR) and test-set-validation partial least squares regression (TSV-PLSR) analyses were employed for analysing the data. The second derivative (2d) spectra with 19 smoothing points (Savitzky–Golay algorithm, second polynomial) gave the best result as spectral pre-processing treatment with the lowest root mean square error of cross-validation and the highest coefficient of determination for cross-validation based on the optimum number of latent variables as assessed from the minimum validation residual variance value in the CV-PLSR analysis. These 2d spectra were then used in the TSV-PLSR analysis for 100 repetitions to check the robustness of the calibration.

    DOI: 10.1080/20426445.2017.1378398

    Web of Science

    Scopus

  77. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy 査読有り

    Inagaki T., Kashima M., Tsuchikawa S.

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     頁: 3 - 6   2017年

     詳細を見る

    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  

    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

    Scopus

  78. NIR Spectral-kinetic analysis for thermally degraded Sugi (Cryptomeria japonica) wood 査読有り

    Tetsuya Inagaki, Miyuki Matsuo and Satoru Tsuchikawa

    Applied Physics A     2016年

     詳細を見る

    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/s00339-016-9763-x

  79. Effect of heat treatment on colour changes of black alder and beech veneers 査読有り

    Salca, EA, Kobori, H, Inagaki, T, Kojima, Y, Suzuki, S

    JOURNAL OF WOOD SCIENCE   622 巻   頁: 297-304   2016年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  80. Three-fibre-based diffuse reflectance spectroscopy for estimation of total solid content in natural rubber latex 査読有り

    Tetsuya Inagaki Daisuke Nozawa, Yoshiaki Shimomura and Satoru Tsuchikawa,

    Journal of Near infrared spectroscopy   24 巻   頁: 327-335   2016年

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  81. Optical Properties of Drying Wood Studied by Time-Resolved Near-Infrared Spectroscop 査読有り

    Konagaya K., Inagaki T., Kitamura R. and Tsuchikawa S

    Optic Express   9 巻   頁: 9561-9573   2016年

     詳細を見る

    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  82. Fast online NIR technique to predict MOE and moisture content of sawn lumber 査読有り

    Hikaru Kobori, Tetsuya Inagaki, Takaaki Fujimoto, Tsutomu Okura, Satoru Tsuchikawa

    HOLZFORSCHUNG   69 巻 ( 3 ) 頁: 329-338   2015年4月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  83. Combined effects of UV light and elevated temperatures on wood discolouration 査読有り

    Laszlo Tolvaj, Satoru Tsuchikawa, Tetsuya Inagaki, Denes Varga

      49 巻 ( 6 ) 頁: 1225-1237   2015年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  84. Visualisation of degree of acetylation in beechwood by near infrared hyperspectral imaging 査読有り

    Tetsuya Inagaki, Katsuya Mitsui, Satoru Tsuchikawa

    J. Near Infrared Spectrosc.   23 巻   頁: 353-360   2015年

     詳細を見る

    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  85. Assessment of variations in air-dry wood density using time-of-flight near-infrared spectroscopy 査読有り

    GUILLAUME HANS, RYUNOSUKE KITAMURA, TETSUYA INAGAKI, BRIGITTE LEBLON & SATORU TSUCHIKAWA

    Wood Material Science & Engineering     2014年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1080/17480272.2014.923937

  86. Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy 査読有り

    Tetsuya Inagaki, Belal Ahmed, Ian D. Hartley, Satoru Tsuchikawa, Matthew Reid

    J Infrared Milli Terahz Waves     2014年

     詳細を見る

    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/s10762-014-0095-7

  87. High accuracy rapid prediction and feasibility of on-site nondestructive estimation of Para rubber quality by spectroscopic methods 査読有り

    Tetsuya Inagaki, Panmanas Sirisomboon, Chang Liu, Warunee Thanapase, Satoru Tsuchikawa

    Journal of Wood Science   59 巻   頁: 119-126   2013年

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  88. Eucalyptus Camaldulensis Density and Fiber Length Estimated by Near Infrared Spectroscopy 査読有り

    Tetsuya Inagaki, Manfred Schwanninger, Reina Kato, Yohei Kurata, Warunee Thanapase, Pratuang Puthson and Satoru Tsuchikawa

    Wood Science and Technology     2012年

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/s00226-010-0379-6

  89. Rapid Prediction of Past Climate Condition from Lake Sediments by Near-Infrared (NIR) Spectroscopy 査読有り

    TETSUYA INAGAKI, YOSHITSUGU SHINOZUKA, KAZUYOSHI YAMADA, HITOSHI YONENOBU, AKIRA HAYASHIDA, SATORU TSUCHIKAWA, AKIHIROYOSHIDA, YASUHARU HOSHINO, KATSUYA GOTANDA, and YOSHINORI YASUDA

    APPLIED SPECTROSCOPY   66 巻   頁: 673-679   2012年

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  90. Near Infrared Spectroscopic Assessment of Contamination Level of Sewage 査読有り

    etsuya Inagaki, Yukari Shinoda, Mitsuhiro Miyazawa, Hitoshi Takamura and Satoru Tsuchikawa

    Water Science and Technology   61 巻   頁: 1957   2010年

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  91. Near-Infrared Spectroscopic Investigation of the Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Objects. Part II: Hardwood 査読有り

    Tetsuya Inagaki, Katsuya Mitsui and Satoru Tsuchikawa

    Applied Spectroscopy   63 巻   頁: 753   2009年

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  92. Monitoring of Hydroxyl Groups in Wood during Heat Treatment Using NIR Spectroscopy 査読有り

    Katsuya Mitsui, Tetsuya Inagaki and Satoru Tsuchikawa

    Biomacromolecules   9 巻   頁: 286   2008年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  93. Near-Infrared Spectroscopic Monitoring of the Water Adsorption/Desorption Process in Modern and Archaeological Wood 査読有り

    Tetsuya Inagaki, Hitoshi Yonenobu and Satoru Tsuchikawa

    Applied Spectroscopy   62 巻   頁: 860   2008年

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  94. Near-Infrared Spectroscopic Investigation of the Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Objects. Part I: Softwood 査読有り

    Tetsuya Inagaki, Katsuya Mitsui and Satoru Tsuchikawa

    Applied Spectroscopy   62 巻   頁: 1209   2008年

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

▼全件表示

書籍等出版物 9

  1. Near-Infrared Spectroscopy: Theory, Spectral Analysis, Instrumentation, and Applications

    尾崎, 幸洋, Huck, Christian, 土川, 覚, Engelsen, Søren Balling( 担当: 共著 ,  範囲: “Time-of-Flight Spectroscopy”, “Wooden Material and Environmental Sciences”)

    Springer  2020年11月  ( ISBN:9811586470

     詳細を見る

    総ページ数:601   記述言語:英語

    CiNii Books

    ASIN

  2. 近赤外ハイパースぺクトラル画像のディープラーニング認識

    稲垣哲也

    検査技術  2020年 

  3. “Time-of-Flight Spectroscopy”, “Wooden Material and Environmental Sciences”

    T. Inagaki( 担当: 共著 ,  範囲: Time-of-Flight Spectroscopy”, “Wooden Material and Environmental Sciences”)

    Near-Infrared Spectroscopy-Theory, Spectral Analysis, Instrumentation, and Applications-, Editor: Y. Ozaki, C. Huck, S. Tsuchikawa  2020年 

  4. 近赤外分光イメージング法の農業・食品分野への応用

    土川覚、稲垣哲也、馬特( 担当: 共著)

    月刊画像ラボ  2020年 

  5. The Encyclopedia of Archaeological Sciences

    Sandra L. López Varela( 担当: 共著 ,  範囲: Paper Analysis)

    Wiley-Blackwell  2018年12月  ( ISBN:047067461X

     詳細を見る

    総ページ数:1992   記述言語:英語

    CiNii Books

    ASIN

  6. 実験講座(24)近赤外分光法による木質素材の測定─留意点 ─ 査読有り

    稲垣哲也( 担当: 単著)

    木材工業  2015年4月 

     詳細を見る

    記述言語:日本語

  7. Establishment of Near Infrared Archaeometry 査読有り

    ( 担当: 共著)

    NIR news  2013年 

     詳細を見る

    記述言語:英語

  8. Paper Analysis 査読有り 国際共著

    S. Tsuchikawa, M. Te, T. Inagaki( 担当: 共著 ,  範囲: Paper Analysis)

    The Encyclopedia of Archaeological Sciences, John Wiley & Sons, Inc. 

     詳細を見る

    記述言語:英語 著書種別:学術書

  9. Pythonを用いたスペクトルデータのケモメトリクス(機械学習)解析

    Tetsuya Inagaki( 範囲: https://www.udemy.com/course/spectra_chemo_python/?referralCode=D7C73F7FBC6B6A4B8DAB)

▼全件表示

MISC 4

  1. Application of Near-Infrared Spectroscopy to Forest and Wood Products

    Tsuchikawa S., Inagaki T., Ma T.  

    Current Forestry Reports9 巻 ( 6 ) 頁: 401 - 412   2023年12月

     詳細を見る

    掲載種別:書評論文,書評,文献紹介等   出版者・発行元:Current Forestry Reports  

    Purpose of Review: Forest and wood products are often characterized by a uniformity of quality attributes, which necessitates the development of rapid and non-destructive quality evaluation methods to ensure their optimal quality. Near-infrared spectroscopy (NIRS) represents a highly suitable approach for the characterization of organic compounds, and is generally combined with sophisticated multivariate analysis methods. This review article presents a range of scientific and technical reports showcasing the successful use of NIRS for evaluating forest and wood products, mainly published within the past 5 years. Recent Findings: Continuous advancements in spectral imaging techniques and the integration of big-data analytics have greatly enhanced the capabilities of NIR instrumentation, enabling its widespread application across diverse fields. Although NIR spectral imaging methods do have some limitations when it comes to online grading, they can still be used to test small quantities of samples at a batch level. Moreover, the ever-increasing use of handheld devices has made NIRS easily accessible. Summary: We aim to provide a summary of new research in basic spectroscopic research, integrating the improvements of spectral imaging methods and big-data analytics. Furthermore, low-cost and portable devices have been produced, enabling remote analysis and further expanding the scope of NIRS applications. Looking forward, we anticipate that continued advancements in this field will enable even wider applications of NIRS for online or at-line quality monitoring in diverse fields.

    DOI: 10.1007/s40725-023-00203-3

    Scopus

  2. 近赤外ハイパースぺクトラル画像のディープラーニング認識

    検査技術26 巻 ( 6 ) 頁: 61 - 66   2020年4月

     詳細を見る

    担当区分:筆頭著者, 責任著者  

  3. 近赤外分光イメージング法の農業・食品分野への応用

    土川覚, 稲垣哲也, 馬特  

    月刊画像ラボ   頁: 29 - 33   2020年4月

  4. 近赤外分光法を用いた紙中の木材パルプの複合的評価手法の開発

      71 巻 ( 3 ) 頁: 318 - 325   2017年

     詳細を見る

講演・口頭発表等 48

  1. 機械学習によるスペクトルデータ解析 _Lambert Beer 則、ケモメトリクス、深 層学習

    稲垣哲也

    <高分子分析研究懇談会> 4 10 回 夏季 例会  2022年7月27日 

     詳細を見る

    開催年月日: 2022年7月

  2. 多変量解析(ケモメトリックス)の理論と実践 招待有り

    稲垣哲也

    第47回近赤外講習会(中・上級コース)・第109回食品技術講習会 

     詳細を見る

    開催年月日: 2021年1月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

  3. -pythonを用いたケモメトリックスの実践- 招待有り

    稲垣哲也

    日本分光学会スペクトル解析部会 第1回講習会 

     詳細を見る

    開催年月日: 2020年2月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

  4. 多変量解析(ケモメトリックス)の理論と実践

    稲垣哲也

    第43回近赤外講習会(中級・上級コース)・第105回食品技術講習会 

     詳細を見る

    開催年月日: 2019年1月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

  5. スペクトル定量分析の基礎 招待有り

    稲垣哲也

    ANS2016, the 5th Asian NIR symposium 

     詳細を見る

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

  6. 「分光分析法による木材の材質評価 _ケモメトリクス・機械学習・深層学習」 招待有り

    稲垣哲也

    日本木材学会中国・四国支部第 33回研究発表会 公開シンポジウム  2022年9月9日 

     詳細を見る

    開催年月日: 2022年9月

  7. 多変量解析(ケモメトリックス)の理論と実践 招待有り

    稲垣哲也

    第45回近赤外講習会(中・上級コース)・第107回食品技術講習会 

     詳細を見る

    開催年月日: 2020年1月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

  8. PLSの基礎

    稲垣哲也

    日本分光学会 第54回夏期セミナー 

     詳細を見る

    開催年月日: 2018年9月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

  9. NIR Spectral-kinetic analysis for thermally degraded wood 国際会議

    T. Inagaki and S. Tsuchikawa

     詳細を見る

    開催年月日: 2017年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:カナダ  

  10. Estimation of Wood Properties by THz Time Domain Spectroscopy, EMN meeting on THz, 招待有り 国際会議

    Tetsuya inagaki, Ian Hartley, Satoru Tsuchikawa and Matthew Reid

     詳細を見る

    開催年月日: 2016年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:スペイン  

  11. Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy 国際会議

    Tetsuya Inagaki, Belal Ahmed, Ian Hartley, Satoru Tsuchikawa and Matthew Reid

    Tetsuya Inagaki, Belal Ahmed, Ian Hartley, Satoru Tsuchikawa and Matthew Reid , 

     詳細を見る

    開催年月日: 2015年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  12. Possibility of Time-of-Flight NIR spectroscopy for the prediction of moisture content of wood 国際会議

    Tetsuya Inagaki, Satoru Tsuchikawa

    The 4th Asian NIR symposium 

     詳細を見る

    開催年月日: 2014年6月

    記述言語:英語   会議種別:ポスター発表  

    国名:大韓民国  

  13. テラヘルツ時間領域分光法による木質素材の物性評価 招待有り

    稲垣哲也

    日本分光学会中部支部講演会~テラヘルツ分光の現状と将来展望~ 

     詳細を見る

    開催年月日: 2014年2月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

  14. THz time domain spectroscopy for density prediction of oven dried wood 国際会議

    Tetsuya Inagaki, Satoru Tsuchikawa Ian D. Hartley and Matthew Reid

    seventh international conference on advanced vibrational spectroscopy 

     詳細を見る

    開催年月日: 2013年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  15. NIR spectroscopic archaeology for buried wood 国際会議

    etsuya Inagaki, Naoya Okumura, Hitoshi Yonenobu and Satoru Tsuchikawa

    16th International Conference on Near Infrared Spectroscopy 

     詳細を見る

    開催年月日: 2013年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:フランス共和国  

  16. 近赤外分光法による木質系文化財・考古資料材質推定技術の確立 招待有り

    稲垣哲也

    第28回近赤外フォーラム 

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    開催年月日: 2013年3月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

  17. High accuracy rapid prediction and feasibility of on-site nondestructive estimation of Para rubber quality by spectroscopic methods 国際会議

    Tetsuya Inagaki, Panmanas Sirisomboon, Chang Liu, Warunee Thanapase, Satoru Tsuchikawa

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    開催年月日: 2012年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:タイ王国  

  18. Difference of Cellulosic Crystalline Structure in Wood between Hydrothermal and Ageing Degradation Observed by NIR Spectroscopy and XRD 国際会議

     詳細を見る

    開催年月日: 2011年5月

    記述言語:英語   会議種別:ポスター発表  

    国名:日本国  

  19. Difference of cellulosic crystalline structure in wood between hydrothermal and ageing degradation observed by NIR spectroscopy and XRD 国際会議

    etsuya Inagaki, Heinz W. Siesler, Katsuya Mitsui, Satoru Tsuchikawa

     詳細を見る

    開催年月日: 2011年3月

    記述言語:英語   会議種別:ポスター発表  

    国名:日本国  

  20. Near-Infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Thermal Treated Wood 国際会議

    Tetsuya Inagaki, Katsuya Mitsui and Satoru Tsuchikawa

    Pittcon 2009 

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    開催年月日: 2010年3月

    記述言語:英語   会議種別:ポスター発表  

  21. Eucalyptus camaldulensis density and fiber length estimated by near infrared spectroscopy 国際会議

    Tetsuya Inagaki, Manfred Schwanninger, Reina Kato, Yohei Kurata, Warnee Thanapase, Pratuang Puthson, Satoru Tsuchikawa

    NIR Conference 2009 

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    開催年月日: 2009年11月

    記述言語:英語   会議種別:ポスター発表  

  22. 近赤外分光法による木材の非破壊評価に関する研究 招待有り

    稲垣哲也

    日本木材学会レオロジー研究会 2009 年度講演会 

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    開催年月日: 2009年8月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

  23. 近赤外分光法による生活排水モニタリングシステムの開発

    稲垣哲也、篠田友佳梨、宮澤光博、高村仁知、土川覚

    第25回近赤外フォーラム 

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    開催年月日: 2009年5月

    記述言語:日本語   会議種別:ポスター発表  

  24. 近赤外分光法によるプランテーションユーカリ材の非破壊材質評価(I)-基礎的検討-

    稲垣哲也、加藤玲奈、倉田洋平、松下泰幸、佐々木康寿、山本浩之、Pratuang Puthson、Warunee Thanapasse、土川覚

    第59回日本木材学会大会 

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    開催年月日: 2009年3月

    記述言語:日本語   会議種別:ポスター発表  

  25. NIR archaeometry as a powerful tool for investigating the archaeological wood-Investigation of thermal degradation mechanism of softwood and hardwood 国際会議

    Tetsuya Inagaki, Katsuya Mitsui, Satoru Tsuchikawa

    International Conference on Wood Science for Preservation of Cultural Heritage: Mechanical and Biological Factors 

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    開催年月日: 2008年11月

    記述言語:英語   会議種別:口頭発表(一般)  

  26. 重水素置換法による熱処理木材の劣化メカニズムの解明

    稲垣哲也、三井勝也、土川覚

    2008年度日本木材学会中部支部大会 

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    開催年月日: 2008年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

  27. Near Infrared Spectroscopic Assessment of Contamination Level of Sewage 国際会議

    Tetsuya Inagaki, Yukari Shinoda, M Miyazawa, H Takamura and Satoru Tsuchikawa

    The 1st Aian NIR Symposium and the 24th Japanese NIR Forum 

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    開催年月日: 2008年11月

    記述言語:英語   会議種別:ポスター発表  

  28. NIR spectroscopic monitoring of water adsorption/desorption process in modern and archaeological wood 国際会議

    Tetsuya Inagaki, Katsuya Mitsui, Satoru Tsuchikawa

    International Conference on Wood Science for Preservation of Cultural Heritage: Mechanical and Biological Factors 

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    開催年月日: 2008年11月

    記述言語:英語   会議種別:ポスター発表  

  29. NIR archaeometry as a powerful tool for investigating the archaeological wood - Spectroscopic observation of the degradation process in thermal treated wood using a deuterium exchange method 国際会議

    Tetsuya Inagaki, Satoru Tsuchikawa

    International Conference on Wood Science for Preservation of Cultural Heritage: Mechanical and Biological Factors 

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    開催年月日: 2008年11月

    記述言語:英語   会議種別:ポスター発表  

  30. Near Infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Thermal Treated Wood 国際会議

    Tetsuya Inagaki, Satoru Tsuchikawa

    The 1st Asian NIR Symposium and the 24th Japanese NIR Forum 

     詳細を見る

    開催年月日: 2008年11月

    記述言語:英語   会議種別:口頭発表(一般)  

  31. 分光分析法による新しい考古計測学の確立―ケモメトリクス的アプローチによる木材の熱劣化機構の解明―

    稲垣哲也、三井勝也、土川覚

    第58回日本木材学会 

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    開催年月日: 2008年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

  32. 近赤外分光法による広葉樹熱劣化機構の解明

    稲垣哲也、三井勝也、土川覚

    第23回近赤外フォーラム 

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    開催年月日: 2007年11月

    記述言語:日本語   会議種別:ポスター発表  

  33. 分光分析法による新しい考古計測学の確立―近赤外分光法による針葉樹熱劣化機構の解明―

    稲垣哲也、三井勝也、土川覚

    第57回日本木材学会 

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    開催年月日: 2007年8月

    記述言語:日本語   会議種別:口頭発表(一般)  

  34. Investigation of Thermal Degradation Mechanism of Soft Wood by NIR Spectroscopy 国際会議

    Tetsuya Inagaki, Katsuya Mitsui, Satoru Tsuchikawa

    NIR Conference 2007 

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    開催年月日: 2007年6月

    記述言語:英語   会議種別:口頭発表(一般)  

  35. Application of Near-infrared Archaeometry to Wood -Variation of Water Adsorption Condition to Wood with Ageing Degradation- 国際会議

    Tetsuya Inagaki, Hitoshi Yonenobu, Satoru Tsuchikawa

    NIR Conference 2007 

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    開催年月日: 2007年6月

    記述言語:英語   会議種別:ポスター発表  

  36. 分光分析法による新しい考古計測学の確立-各種物性の変化-

    稲垣哲也、三井勝也、土川覚

    第22回近赤外フォーラム 

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    開催年月日: 2006年11月

    記述言語:日本語   会議種別:ポスター発表  

  37. Application of NIR Archaeometry to Wood - Variation of Water Adsorption Condition to Wood with Ageing Degradation- 国際会議

    Tetsuya Inagaki, Hitoshi Yonenobu, Satoru Tsuchikawa

    Japan-Korea Joint Symposium on NIRS 

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    開催年月日: 2006年6月

    記述言語:英語   会議種別:ポスター発表  

  38. 分光分析法による新しい考古計測学の確立―木材の経年変化による水分吸放湿機構の変化―

    稲垣哲也、米延仁志、土川覚

    2005年度日本木材学会中部支部大会 

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    開催年月日: 2005年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

  39. スペクトル定量分析の基礎

    稲垣哲也

    第34回近赤外フォーラム ショートコース  2018年11月20日 

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    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

  40. 近赤外分光法による熱処理木材の評価 招待有り

    木質材料部門委員会第297回定例研究会  2018年7月24日 

  41. 近赤外ハイパースぺクトラル イメージングとX線マイクロCT による木材中乾燥過程のモニタリング 招待有り

    レーザー学会第578回研究会 「フォトニクス・ワークショップ in 九州 〜宮崎〜」  2023年9月11日 

  42. 多変量解析(ケモメトリックス)の理論と実践 招待有り

    第47回近赤外講習会(中・上級コース)・第109回食品技術講習会  2021年1月20日 

  43. スペクトル定量分析の基礎 招待有り

    第38回近赤外フォーラム  2023年11月14日 

  44. スペクトルデータを用いた回帰分析 招待有り

    日本分光学会スペクトル解析部会セミナー  2024年2月5日 

  45. Spectroscopic Approach For Wood Engineering 招待有り

    International;Symposium on;Advanced Technology of Agricultural Engineering  2024年8月16日 

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    記述言語:英語  

  46. PLSの基礎 招待有り

    日本分光学会 第54回夏期セミナー  2018年9月7日 

  47. NIR-HSIによる農産物の非破壊評価 招待有り

    第 50 回 冬期講習会 光を用いた非破壊イメージング  2024年1月24日 

  48. NIR-HSI evaluation of wood and fruits 招待有り

    2023-ISNST Symposium  2023年10月19日 

▼全件表示

共同研究・競争的資金等の研究課題 8

  1. Bi-dual解析による木材物性の3Dインテリジェント情報化

    2024年7月 - 2028年7月

    2024年度 江間忠研究助成 

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    担当区分:研究代表者  資金種別:競争的資金

    配分額:10000000円

  2. 革新的で安価な木材等級非破壊高速測定装置の開発

    A-STEP トライアウト 

      詳細を見る

    資金種別:競争的資金

  3. 近赤外分光分析法を活用した天然ゴムオンサイト品質評価手法 の開発

    研究課題番号:28-013019  2014年4月 - 2015年3月

    第25回研究助成 一般研究助成 

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    資金種別:競争的資金

  4. 木質材料に関する可視・近赤外考古計 測学の確立

    研究課題番号:28-G-G2501 

    平成24年度海外研究者招へい事業助成 

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    担当区分:研究代表者 

  5. 日中で築く最先端木質科学研究の架け橋

    研究課題番号:S2019F0529279 

    さくらサイエンスプラン(A.科学技術体験コース) 

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    担当区分:研究代表者 

  6. 日中で築く農林最先端技術の架け橋

    研究課題番号:S2018F0831576 

    さくらサイエンスプラン(A.科学技術体験コース) 

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    担当区分:研究代表者 

  7. 日中共同で取り組む未開拓農業工学研究

    研究課題番号:S2017F0731452 

    さくらサイエンスプラン(B.共同研究活動コース) 

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    担当区分:研究代表者 

  8. 近赤外ハイパースペクトラルイメージングのディープラーニング認識

    令和元年度コニカミノルタ画像科学奨励賞 

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    担当区分:研究代表者 

▼全件表示

科研費 15

  1. THz cellulose crystallographyの展開

    研究課題/研究課題番号:21H02255  2021年4月 - 2024年3月

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    稲垣 哲也, 土川 覚

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    担当区分:研究代表者 

    配分額:12350000円 ( 直接経費:9500000円 、 間接経費:2850000円 )

    本研究では、「木材中のセルロース結晶領域をTHz時間領域分光法(THz-TDs)によって評価する新たな学問領域『THz cellulose crystallography』、すなわち木材のTHz透過スペクトルから結晶量・結晶構造・ミクロフィブリル傾角(MFA)を高精度計測するアルゴリズムを確立」することを目標としている。
    2021年度には結晶量・結晶構造・ミクロフィブリル傾角(MFA)を高精度推定するために、さまざまな試料(木材、セルロース試料、疑似木材)についてTHzスペクトルおよびX線回折チャートを測定し、それぞれの性質について評価した。これによりTHz分光法を用いることで、結晶量と結晶構造についてはX線回折法よりも高精度に推定できることを示した。またMFAについては、(木材のラディアルストリップのMFAの連続測定が可能な)Silviscan測定を行っているところである。Silviscan測定完了後には、試料から板目面を切り出しTHz測定することで、THzスペクトルからのMFA推定を可能とする。また2次元ステッピングモーターを用意し、試料を走査させながらTHzスペクトルを測定する機構を構築した。これらが非常に円滑に進捗しているため、次年度からは様々な含水率状態にある木材の結晶性評価、熱処理による木材の結晶性変化の追跡およびイメージング測定による結晶の空間的分布の変化を把握することに挑戦する。

  2. 超広帯域マルチ分光計測による古材の表層・内部材質評価手法の確立

    2014年4月 - 2016年3月

    科学研究費補助金  若手研究(B)

      詳細を見る

    担当区分:研究代表者 

  3. ユニークな分光法のカップリングによる脱ケモメトリクス果実評価手法の構築

    2015年4月 - 2017年3月

    科学研究費補助金 

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    担当区分:研究分担者 

  4. NIR-HSI法を活用した木材のハイスループット型材質分析手法の確立

    2013年4月 - 2016年3月

    科学研究費補助金  基盤研究(B)

      詳細を見る

    担当区分:研究分担者 

  5. 広帯域マルチ分光計測による木材乾燥現象の微視的~巨視的レベルでの把握

    2013年4月 - 2015年3月

    科学研究費補助金 

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    担当区分:研究分担者 

  6. テラヘルツ時間領域分光法によるエンジニアリングウッドの非破壊総合材質診断

    2016年4月 - 2019年3月

    科学研究費補助金  基盤研究(A)

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    担当区分:研究分担者 

  7. 非破壊測定手法を用いた材分解促進イベントの実証

    研究課題/研究課題番号:24K01805  2024年4月 - 2028年3月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    酒井 佳美, 堀澤 栄, 鵜川 信, 徳地 直子, 上村 真由子, 稲垣 哲也

  8. 革新的で安価な木材等級非破壊高速測定装置の開発

    2022年9月 - 2024年3月

    JST  A-STEPトライアウト 

      詳細を見る

    担当区分:研究代表者 

  9. スナップショット型近赤外ハイパースペクトラル画像による木材内水分動態モニタリング

    研究課題/研究課題番号:22H02405  2022年4月 - 2025年3月

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    土川 覚, 稲垣 哲也, 馬 特

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    担当区分:研究分担者 

    スナップショット型近赤外ハイパースペクトラルイメージング(NIR-ssHSI)法によって、木材の乾燥過程を詳細に追跡することにより、生材状態から全乾状態まで多岐にわたる木材の水分動態を振動分光学的に明らかにする。様々な条件下で柱材試片を乾燥させ、逐次これを鋸断して内部断面をNIR-ssHSIカメラで撮影し、得られた一連のハイパースペクトラルデータをケモメトリクス的に解析することにより、木材内部の水分体積流と拡散現象を3Dモニタリングする。

  10. スナップショット型近赤外ハイパースペクトラル画像による木材内水分動態モニタリング

    研究課題/研究課題番号:23K23670  2022年4月 - 2025年3月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    土川 覚, 稲垣 哲也, 馬 特

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    本研究は、「分子振動情報を瞬時に直接可視化するスナップショット型近赤外ハイパースペクトラルイメージング(NIR-ssHSI)法によって、木材の乾燥過程を詳細に追跡することにより、生材状態から全乾状態まで多岐にわたる木材の水分動態を振動分光学的に明らかにする」ことを目的としている。
    初年度の今年度は「木材自然乾燥下でのNIR-ssHSI測定および水分動態モニタリング」を目的とし、拡散方程式に基づく水分移動シミュレーションによって木材内水分移動特性を統一的に理解することを試みた。なおNIR-ssHSIでは特に各画素におけるノイズの特性を評価することが必要不可欠である。そこでまずこのことに注力し、各画素のノイズ特性を把握するとともに、得られた画像を高いS/Nで解析しうるアルゴリズムを考案した。さらに今年度は木材中の水分移動を厳密に把握するために、ヒノキ材の含水率を変化させながらX線マイクロCTおよびプッシュブルーム型の近赤外HISを測定し、これらの三次元画像を有限要素法によって解析することで木材中の水移動を高精度で推定可能とした。得られた一連のハイパースペクトラルデータに基づいて、多変量解析の一種である部分的最小二乗回帰(PLS回帰)から各断面の含水率マッピングを行うとともに、(NIR-HSIが水素結合の変化に敏感であることを利用して)主成分分析(PCA)のスコア画像から木材内部の自由水と結合水分布をマッピングすることに成功した。

  11. 樹木根の分解と炭素貯留機能の持続性-土壌深度の影響解明と広域評価-

    研究課題/研究課題番号:19H03012  2019年4月 - 2024年3月

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    酒井 佳美, 堀澤 栄, 鵜川 信, 徳地 直子, 上村 真由子, 稲垣 哲也

      詳細を見る

    担当区分:研究分担者 

    土壌の深さ別の分解能力推定手法開発のための予備試験を継続した。約1年間分解させた木杭を回収し、本木杭を模擬根と仮定して分解による材密度変化の可視化のための近赤外光によるハイパースペクトラルイメージングデータを取得した。
    広域での樹木根分解過程の影響要因解明のため分解試験をおこない分解期間2年の分解速度を推定し、樹木根分解試料の微生物群集を明らかにした。全国7試験地のリターバック法による分解試験の2年間の重量減少率を用いて推定した分解定数を比較し初期分解への影響要因を検討した。各試験地の重量減少率に一次指数関数を用いて近似計算した分解定数は市販の丸太材の四割材で0.02~0.51、疑似材は0.09~0.97、枝と根では0.15~0.57の範囲であった。四割材と枝と根は気温と正の相関がある一方、疑似材は気温以外の要因の存在が推察された。固形の木材と、疑似材のように細片化した木片では分解への主たる影響要因が変化すると考えられた。土壌深さ別に比較すると、分解が最も早い深さは5-10cm(群馬水上、筑波山、熊本)あるいは20-30cm(標茶、羊ヶ丘)となり、試験地間で傾向が異なることが明らかとなった。微生物群集の判定を四割材の分解試料を用いて進めた。北海道(標茶、羊ヶ丘)を除く5か所の試験地間で比較すると、群馬水上の微生物相が他の4か所とは有意に異なっていた。群馬水上では落葉広葉樹林、他の4か所はスギ人工林に設置しており植生の影響が予想され、さらに検討を進める予定である。また、試験地全体の傾向として、バクテリアと真菌類の多様度に相関が認められた。
    広域の環境変化をより詳細に解析するため新たに2か所の試験地を設置した。

  12. コグニティブスペクトロスコピーによる自動樹種判別システムの構築

    研究課題/研究課題番号:19H03015  2019年4月 - 2022年3月

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    土川 覚, 稲垣 哲也

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    担当区分:研究分担者 

    本研究では、「多層構造のニューラルネットワークを用いた機械学習であるディープラーニングを木材の可視・近赤外シームレスハイパースペクトラルデータに適用して、木材の樹種判別を自動で行えるプロトコルを構築し、コグニティブスペクトロスコピーともいうべき新たな認識科学分析手法を確立すること」を目標とした。
    広葉樹38樹種の可視画像および近赤外ハイパースペクトラル画像をもとに、CNNを用いて樹種判別を行ったところ、近赤外画像を用いた場合の正答率は90.5%に達した。これにより「試料表面の分子振動情報とその空間分布をCNNによって分析する」という新たな認識化学分析手法の可能性を示すことができた。

  13. テラヘルツ時間領域分光法によるエンジニアリングウッドの非破壊総合材質診断

    研究課題/研究課題番号:16H02559  2016年4月 - 2019年3月

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    土川 覚, 稲垣 哲也, 小堀 光, 鈴木 滋彦, リード マシュー

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    担当区分:研究分担者  資金種別:競争的資金

    木材への透過性に優れ、安全性の高いTHz領域電磁波によるエンジニアリングウッド非破壊評価手法の開発を行った。一連の研究によって、THz時間領域分光法によって合板の密度・含水率・繊維走向を高精度・非破壊で推定できることが示された。また合板に用いられている接着剤の定性も可能であった。さらに、上記性質の画像化および合板の各層の診断可能性も示唆された

  14. 時間・空間分解分光法による吸収・散乱・蛍光特性の把握と木材評価への応用

    研究課題/研究課題番号:16K07805  2016年4月 - 2019年3月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    稲垣 哲也, 土川 覚

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    担当区分:研究代表者 

    配分額:4940000円 ( 直接経費:3800000円 、 間接経費:1140000円 )

    近赤外光による木材の品質評価手法に関する研究を行った。これまで木材中での光の散乱については不明な点が多かったが、時間分解分光法・空間分解分光法やシミュレーションを用いることで、木材内部(細胞壁レベル)での光の散乱特性を把握した。また密度や含水率が光の散乱に及ぼす影響を詳細に調べた。これらの情報をもとに、安価・小型な密度計測装置を試作し、十分な精度で密度予測が可能であることを示した。

  15. ユニークな分光法のカップリングによる脱ケモメトリクス果実評価手法の構築

    研究課題/研究課題番号:15K14833  2015年4月 - 2017年3月

    日本学術振興会  科学研究費助成事業  萌芽研究

    土川 覚, 稲垣 哲也

      詳細を見る

    資金種別:競争的資金

    本研究では、ピコ秒オーダの極短時間パルス近赤外光の物質内部での時間変化を解析
    することにより、果実の吸収係数および等価散乱係数を厳密に求め(TOF-NIRS)、さ
    らに果実に照射されたハロゲン光の拡散反射光強度を2本のファイバで検出し(TFDRS)、両者のパラメータから物質内部での光吸収量(化学成分値)を統計解析に頼らずに求めることに成功した。さらに計測した光学定数からモンテカルロシミュレーションを用いて、りんご内部での光挙動のシミュレーションを行った。これにより①蜜部位の面積比率と透過光強度に相関があること、②りんごの散乱係数が大きいことから、透過画像から蜜部位の特定が難しいことが判明した。

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担当経験のある科目 (本学) 68

  1. 物理学基礎Ⅰ

    2023

  2. 理系基礎科目 物理学実験

    2020

  3. 農学部特別講義・農業情報工学

    2020

  4. 生物材料解析学

    2020

  5. 応用分光分析法

    2020

  6. 生命系物理工学

    2020

  7. 生物材料プロセス工学

    2020

  8. データサイエンス特別講義3

    2020

  9. 物理学基礎Ⅰ

    2024

  10. 生物情報計測学(2016年度以前入学)

    2024

  11. 農学部特別講義 農業情報工学(2016年度以前入学)

    2024

  12. 生物材料機能学(2016年度以前入学)

    2024

  13. [遠隔]生命系物理工学

    2024

  14. 農学部特別講義 農業情報工学

    2024

  15. 生物材料機能学

    2024

  16. データサイエンス特別講義2

    2024

  17. 生物材料解析学特論

    2024

  18. データサイエンス特別講義2

    2024

  19. 生物材料機能学

    2023

  20. 農学部特別講義 農業情報工学

    2023

  21. [遠隔]生命系物理工学

    2023

  22. 生物材料機能学

    2023

  23. 農学部特別講義 農業情報工学

    2023

  24. [遠隔]生物情報計測学

    2023

  25. データサイエンス特別講義2

    2023

  26. データサイエンス特別講義2

    2023

  27. 生物材料解析学特論

    2023

  28. データサイエンス特別講義3

    2023

  29. 生命農学基盤実験(応用分光分析法)

    2023

  30. 生物材料プロセス工学

    2023

  31. 生物材料プロセス工学

    2023

  32. データサイエンス特別講義3

    2023

  33. 生物材料機能学

    2022

  34. 生物環境科学セミナー

    2022

  35. 農学部特別講義 農業情報工学

    2022

  36. 生物情報計測学

    2022

  37. 生命系物理工学

    2022

  38. データサイエンス特別講義2

    2022

  39. データサイエンス特別講義2

    2022

  40. 生物材料解析学特論

    2022

  41. 生物材料機能学

    2022

  42. 農学部特別講義 農業情報工学

    2022

  43. 農学セミナー1(環境)

    2022

  44. データサイエンス特別講義3

    2022

  45. 生命農学基盤実験(応用分光分析法)

    2022

  46. 生物材料プロセス工学

    2022

  47. 農学セミナー2(環境)

    2022

  48. 生物材料プロセス工学

    2022

  49. データサイエンス特別講義3

    2022

  50. 生物情報計測学

    2021

  51. 生命系物理工学

    2021

  52. データサイエンス特別講義2

    2021

  53. データサイエンス特別講義2

    2021

  54. 生物材料解析学特論

    2021

  55. 生命農学基盤実験

    2021

  56. 生物材料プロセス工学

    2021

  57. 生物材料プロセス工学

    2021

  58. データサイエンス特別講義3

    2021

  59. データサイエンス特別講義3

    2021

  60. 生物環境科学実験実習

    2020

  61. 修士論文研究4

    2020

  62. 修士論文研究3

    2020

  63. 修士論文研究2

    2020

  64. 修士論文研究1

    2020

  65. 生命農学演習4

    2020

  66. 生命農学演習3

    2020

  67. 生命農学演習2

    2020

  68. 生命農学演習1

    2020

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担当経験のある科目 (本学以外) 11

  1. Pythonを用いたスペクトルデータのケモメトリクス(機械学習)解析

    2022年 - 現在 https://www.udemy.com/course/spectra_chemo_python/?referralCode=D7C73F7FBC6B6A4B8DAB)

  2. データサイエンス3

    2019年 - 現在 名古屋大学)

  3. 応用分光分析法

    2018年 - 現在 名古屋大学)

  4. 物理学基礎I

    2023年 - 現在 名古屋大学)

  5. 生命系物理工学

    2018年 - 現在 名古屋大学)

  6. 生物材料解析学

    2018年 - 現在 名古屋大学)

  7. 生物材料プロセス工学

    2018年 - 現在 名古屋大学)

  8. 物理学実験

    2018年 - 2022年 名古屋大学)

  9. 生物情報計測学

    2013年 - 2017年 名古屋大学)

  10. 生物材料機能学

    2011年4月 - 現在 名古屋大学)

  11. 生物環境科学実験実習

    2011年4月 - 現在 名古屋大学)

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