Faculty Profiles - AOKI Takaaki

Course Development of Electric and Electronic Circuit Exercise utilizing BYOD-PC and Course Management System

青木学聡, 久門尚史, 木村真之, 蛯原義雄, 下田宏

研究報告教育学習支援情報システム(CLE) Vol. 2017 ( 3 ) page： 1 - 5 2017.3

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：情報処理学会

Kyoto University Undergraduate School of Electrical and Electronic Engineering deployed a course of circuit exercise on the premise of BYOD-PC from FY 2016. This course is a compulsory subject for the school, so that the course curriculum was designed in consideration with "selection of relevant software and hardware" and "ICT facility support". This course was operated utilizing course management system to organize "distribution of textbook and related materials" and "submission of weekly and midterm reports" electronically. By use of BYOD-PC and course management system, we were able to introduce novel learning style for exercise subjects as well, such as flipped learning for acquisition of individual unit skills, and collaboration of project activities by group works.

Building and Development of Research Data Management Training Tool Reviewed

Mao Tsunekawa, Eriko Amano, Hayahiko Ozono, Yui Nishizono, Shota Maeda, Yuko Matsumoto, Yasuyuki Minamiyama, Taro Misumi, Takaki Aoki, Koichi Ojiro, Kazutsuna Yamaji

Joho Chishiki Gakkaishi Vol. 27 ( 4 ) page： 362 - 365 2017

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Information and Knowledge

<p>　Research Data Management (RDM) is one of the important research process for promoting researchintegrity and open science. But, in Japan, there are few human resources have skill of RDM yet. So we, “Research Data Task Force” (RD-TF) be organized by JPCOAR, developed “RDM Training Tool” that is a training tool for learning skill of RDM and have published RDM Training Tool on 2017-06-06. Furthermore, we are cooperating with National Institute of Informatics (NII) for beginning online lecture courses named “Research data management in the open science era”. In this proposal, we introduced activities about supporting learning about Research Data Management, and discussion.</p>

DOI： 10.2964/jsik_2017_042

Development and Deployment of Research Data Preservation Policy at a Japanese Research University in 2016

Aoki Takaaki, Kajita Shoji, Akasaka Hirokazu, Takeda Hagane

2017 6th IIAI International Congress on Advanced Applied Informatics (IIAI-AAI) page： 120 - 123 2017

Language：English Publishing type：Research paper (scientific journal)

This paper reviews the policy development and deployment for research data preservation at Kyoto University, Japan, during fiscal year (FY) 2016. The universitys regulations and guidelines for research integrity and data preservation were formulated in FY2014 and 2015, in response to statements from the Ministry of Education, Culture, Sports, Science and Technology, and supplemental comments by Science Council of Japan (in FY2014). In FY2016, several departments at KU developed a prototype system for research data preservation using open source web frameworks with preference to agility of deployment rather than robustness. The prototype system also worked as the proof of concept for a full-service research data preservation system, which is due to be deployed by KUs central IT department in FY2017 for university-wide use.

Design of Long-term Data Preservation System using Enterprise Content Management and Optical Disc Archive Storage

AOKI Takaaki, KAJITA Shoji, AKASAKA Hirokazu, TAKEDA Hagane

AXIES Annucal Conference 2016 2016.12

Improvement of CMS Operation at User Side -- A Case of Assignment Tool on Sakai

Aoki, Takaaki, Kita, Hajime

2016.12

Language：Japanese Publishing type：Research paper (scientific journal)

AXIES: 大学ICT推進協議会 2016年度年次大会Webベースの情報システムは操作面での改善をユーザサイドでは行いにくいという欠点がある．コース管理システム(CMS)も教員が本格的に利用する上では授業を受講する多くの学生と個々にインタラクションする場合の操作量が相当に多いという課題があるがこれを実運用するサーバ側で改善することは管理上の問題なども発生する．本報告では Sakai の課題ツールで回答を一括ダウンロードできることを利用し，回答を効果的に閲覧するプログラムを作成することでユーザ側での運用を改善する試みについて報告する．

Molecular dynamics simulations study of nano particle migration by cluster impact Reviewed

Takaaki Aoki, Toshio Seki, Jiro Matsuo

Surface and Coatings Technology Vol. 306 page： 63 - 68 2016.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

© 2016 Elsevier B.V.Molecular dynamics (MD) simulations are performed in order to investigate the radiation effects of a huge and slow gas cluster for the surface cleaning process. When a large argon cluster with the size ranging from 20,000 to 300,000 is accelerated with a total of 30. keV, each constituent atom carries very low energy ranging from 1.5. eV/atom to 0.1. eV/atom. In many cases, the cluster does not penetrate the solid target surface but is deflected in a lateral direction. This collisional process results in a high density particle flow spreading along the surface plane due to cohesion of the cluster, which suggests the capability to modify the irregular surface structure, without damage in the target. The MD simulations demonstrate that such a huge cluster sweeps a nano particle (NP, 3. nm in radius) attached on a planar silicon target's surface. From the investigation of various conditions of cluster impact, it is found that the migration distance is correlated with the kinetic energy applied on the NP by the impact of cluster atoms. Additionally, the MD results suggest the existence of optimized parameters for the maximum migration distance for the offset distance between the cluster and the NP, and the cluster size for constant total energy (equivalent to energy per atom or kinetic energy density). The optimized offset distance was estimated as the summation of radii of the incident cluster and the NP. The optimized energy per atom was suggested around 0.6. eV/atom, where the cluster efficiently spreads in lateral direction keeping higher kinetic energy density of particle flow.

DOI： 10.1016/j.surfcoat.2016.04.053

Other Link： http://orcid.org/0000-0002-5926-4903

Reactive etching by ClF

Seki Toshio, Yoshino Yu, Senoo Takehiko, Koike Kunihiko, Aoki Takaaki, Matsuo Jiro

Jpn. J. Appl. Phys. Vol. 55 ( 6 ) page： 06HB01 2016.5

Language：English Publishing type：Research paper (scientific journal) Publisher：Institute of Physics

A reactive gas cluster injection system with a scanning function was developed in order to increase the processing area. High-precision anisotropic etching with an aspect ratio of 7 was achieved for ClF<inf>3</inf>cluster etching without scanning. However, with scanning, the aspect ratio for etching decreased to 1.5 because the side walls were etched by the gas retained in the trench. By reducing the source gas pressure, increasing the target distance, and mixing He in the source gas, anisotropic etching with an aspect ratio of about 6.3 was achieved with this apparatus.

DOI： 10.7567/JJAP.55.06HB01

Web of Science

Development of ambient SIMS using mega-electron-volt-energy ion probe Reviewed

Masakazu Kusakari, Makiko Fujii, Toshio Seki, Takaaki Aoki, Jiro Matsuo

Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics Vol. 34 ( 3 ) 2016.5

Language：English Publishing type：Research paper (scientific journal) Publisher：American Institute of Physics Inc.

A new secondary ion mass spectrometry device using an ion probe in the heavy mega-electron-volt (MeV) energy range was developed for detecting large intact molecules with high sensitivity under ambient conditions. The instrument is based on the characteristics induced by the MeV-energy heavy ions, namely, electronic excitation induced in the near-surface region and the high transmission capability under ambient conditions. The secondary ions were transported to the mass analyzer effectively by an electric field and atmospheric gas flow, whereas the chemical impurities from the gas were cleared by using an electric field. In addition, this new ambient analysis approach enables evaluation not only of solid samples, but also of liquid samples that were evaporated under advanced vacuum. In this study, liquid water and samples of a benzoic acid solution were measured under ambient conditions.

DOI： 10.1116/1.4941724

Development of ambient SIMS using mega-electron-volt-energy ion probe Reviewed

Masakazu Kusakari, Makiko Fujii, Toshio Seki, Takaaki Aoki, Jiro Matsuo

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B Vol. 34 ( 3 ) page： 4 2016.5

Language：English Publishing type：Research paper (scientific journal) Publisher：A V S AMER INST PHYSICS

DOI： 10.1116/1.4941724

Secondary ion emission from leucine and isoleucine under argon gas-cluster ion bombardment Reviewed

Hubert Gnaser, Masakazu Kusakari, Makiko Fujii, Toshio Seki, Takaaki Aoki, Jiro Matsuo

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B Vol. 34 ( 3 ) 2016.5

Language：English Publishing type：Research paper (scientific journal) Publisher：A V S AMER INST PHYSICS

The emission of sputtered ions from isoleucine and leucine specimens under bombardment by 10 keV argon gas-cluster ions Ar-1000(+) was investigated by orthogonal time-of-flight secondary ion mass spectrometry, in an attempt to examine the possibility of discriminating these amino acids by means of specific differences in their mass spectra. Apart from of the protonated molecular ions (M+H)(+) a prolific flux of singly charged and doubly charged molecular cluster ions, (M-n+H)(+) (1 <= n <= 15) and (M-n+2H)(2+) (8 <= n <= 29) was observed. The distributions of the cluster yields Y-n as a function of their size n were found to be very similar for both amino acids. In addition, the fraction of emitted fragment and other ion species is typically low, and no distinct differences were detected for isoleucine and leucine. Therefore, the present data seem to indicate that a discrimination of isoleucine and leucine via mass spectrometric means is not possible. (C) 2016 American Vacuum Society.

DOI： 10.1116/1.4939497

Web of Science

Observation of Liquid Water with Ambient SIMS

Kusakari M., Fujii M., Seki T., Aoki T., Matsuo J.

Transactions of the Materials Research Society of Japan Vol. 41 ( 3 ) page： 309 - 311 2016

Language：English Publishing type：Research paper (scientific journal) Publisher：The Materials Research Society of Japan

<p> Secondary ion mass spectrometry (SIMS) is powerful method for obtaining component information from solid samples, such as semiconductor devices and biological tissue. Moreover, SIMS has high surface sensitivity because of the use of a primary ion probe. The keV-energy ion probe is, however, unstable under low vacuum conditions and this makes evaluation of volatile liquid samples difficult. A new SIMS technique that uses an MeV-energy heavy ion probe, called ambient SIMS, enables measuring volatile liquid samples under ambient conditions by high transmission capability of the primary probe. In this study, water in liquid form, which has a relatively high vapor pressure (2,339 Pa at 20℃), was evaluated by ambient SIMS and gave some cluster ions with high intensity. This result suggests that ambient SIMS has significant potential for evaluating both solid and liquid samples with high sensitivity.</p>

DOI： 10.14723/tmrsj.41.309

Secondary ion emission from leucine and isoleucine under argon gas-cluster ion bombardment Reviewed

Ambient analysis of liquid materials with Wet-SIMS Reviewed

Seki, T., Kusakari, M., Fujii, M., Aoki, T., Matsuo, J.

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Vol. 371 page： 189 - 193 2016

Language：English Publishing type：Research paper (scientific journal)

© 2015 Elsevier B.V. All rights reserved.Secondary ion mass spectrometry (SIMS) is a method with high surface sensitivity that allows both elemental and molecular analysis. However, volatile liquid (wet) samples are difficult to measure using conventional SIMS, because samples must be dried and introduced into a high vacuum chamber. The mean free path of ions with energy in the keV range is very short in low vacuum and these ions cannot penetrate the surface. In contrast, ions in the MeV-energy range have high transmission capability in low vacuum and wet samples can be measured using heavy ions without dry sample preparation. Ion beams in the MeV-energy range also excite electrons near the surface and enhance the ionization of high-mass molecules and thus fragment-suppressed SIMS spectra of ionized molecules can be obtained. We have developed an ambient analysis system with secondary ion mass spectrometry for wet samples (Wet-SIMS) that operates from low vacuum to 30 kPa using MeV-energy heavy ion beams. The system is equipped with fine apertures that avoid vacuum degradation at both the primary beam incidence and the secondary ion measurement sides, even when the target chamber is filled with He gas at 30 kPa. Water evaporation was suppressed in a He atmosphere of 16.5 kPa and a solution of benzoic acid could be measured using MeV-energy heavy ions.

DOI： 10.1016/j.nimb.2015.09.046

Development of Low-vacuum SIMS instruments with large cluster Ion beam Reviewed

Suzuki, K., Kusakari, M., Fujii, M., Seki, T., Aoki, T., Matsuo, J.

Surface and Interface Analysis Vol. 48 ( 11 ) page： 1121 - 1121 2016

Development of ambient SIMS using mega-electron-volt-energy ion probe Reviewed

Masakazu Kusakari, Makiko Fujii, Toshio Seki, Takaaki Aoki, Jiro Matsuo

Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena Vol. 34 ( 3 ) 2016

Gnaser, H., Kusakari, M., Fujii, M., Seki, T., Aoki, T., Matsuo, J.

Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics Vol. 34 ( 3 ) page： 5 2016

Language：English Publishing type：Research paper (scientific journal)

© 2016 American Vacuum Society.The emission of sputtered ions from isoleucine and leucine specimens under bombardment by 10 keV argon gas-cluster ions Ar 1000 + was investigated by orthogonal time-of-flight secondary ion mass spectrometry, in an attempt to examine the possibility of discriminating these amino acids by means of specific differences in their mass spectra. Apart from of the protonated molecular ions (M+H)+ a prolific flux of singly charged and doubly charged molecular cluster ions, (Mn+H)+ (1 ≤ n ≤ 15) and (Mn+2H)2+ (8 ≤ n ≤ 29) was observed. The distributions of the cluster yields Yn as a function of their size n were found to be very similar for both amino acids. In addition, the fraction of emitted fragment and other ion species is typically low, and no distinct differences were detected for isoleucine and leucine. Therefore, the present data seem to indicate that a discrimination of isoleucine and leucine via mass spectrometric means is not possible.

DOI： 10.1116/1.4939497

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