Faculty Profiles - MIWA Tomio

Papers - MIWA Tomio

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An integrated simulation system study for automated truck lane on intercity expressways (scientific paper) Reviewed

Sun, X., Miwa, T., Yamamoto, T. and Morikawa, T.

Proceedings of the 16th World Congress on Intelligent Transport Systems page： CD-ROM 2009.9

Efficient Link Travel Time Estimation for Signalized Link by Small Size Probe Reports

Li, Q., Miwa, T. and Morikawa T.

Proceedings of the Ninth International Conference on Chinese Transportation Professionals page： 1-8 2009.8

A Basic Study of the Effectiveness of a Parking Deposit System (PDS) Reviewed

Miwa, T., Ando, A., Yamamoto, T. and Morikawa, T.

Proceedings of International Symposium on City Planning page： 618-628 2009.8

Updating dynamic origin-destination matrices using observed link travel speed by probe vehicles Reviewed

Yamamoto, T., Miwa, T., Takeshita, T. and Morikawa, T.

In W.H.K. Lam, S.C. Wong and H.K. Lo (eds.) Transportation and Traffic Theory 2009: Golden Jubilee page： 723-738 2009.7

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

A method for updating dynamic O-D matrix using observed link travel speed of probe vehicles is developed. The method consists of two parts: link flow of total traffic is estimated from the link travel speed of probe vehicles, and dynamic O-D matrix is estimated using the estimated link flow and historical O-D matrix. The k-v function derived from the acceleration model by Gazis, et al. (1961) is applied to the link flow estimate, and the entropy maximization model proposed by Willumsen (1984) is applied to the dynamic O-D demand estimate. By using Bayesian inference approach, the variance of the estimate as well as the point estimate of link flow is obtained. Also, the entropy maximization model is extended to incorporate the difference in the reliability of link flow estimates among links. The results of a case study show that the accuracy of the estimated dynamic O-D matrix is improved by the proposed method, and that the accuracy of the link flow estimates obtained in dynamic O-D demand estimation is improved by the proposed method, too.

*低コストプローブカーデータのオンラインマップマッチング手法の開発 Reviewed

三輪富生，木内大介，山本俊行，薄井智貴，森川高行

交通工学 Vol. 44 ( 3 ) page： 100-110 2009.5

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

プローブカーシステムの普及には，データ収集頻度の低下などコスト低下対策が必要であるが，その場合，生成される交通情報の精度が低下する．本研究では，このような低コストプローブカーデータから高精度の交通情報を生成する方法を開発した．特に，適切なリンクコストの導入や走行経路候補の生成，選択などを組み合わせ，既存手法よりも高精度に処理が可能であることを示した．

*Evaluation of Road Pricing Policy with Semi-Dynamic Combined Stochastic User Equilibrium Model Invited Reviewed

Kanamori, R., Miwa, T. and Morikawa, T.

International Journal of ITS Research Vol. 6 ( 2 ) page： 67-77 2008.12

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

This study analyzes the effect of road pricing using a model with the following characteristics: 1) integration of trip generation (i.e. activity choice), destination choice, mode choice and route choice; 2) consideration of hourly traffic condition variations including queue evolution; and 3) approximate reproduction of trip chain along the time axis. An evaluation of road pricing in the Nagoya Metropolitan Area shows that pricing leads to an effective improvement in the environment as a result of a reduced number of car trips, and at the same time, there is a great reduction in the number of visitors because there is a change of destination and only a small shift to railway.

Development and validation of internet-based personal travel assistance system for mobility management Reviewed

Usui, T., Miwa, T., Yamamoto, T. and Morikawa, T.

Proceedings of the 15th World Congress on Intelligent Transport Systems page： CD-ROM 2008.11

A study of attitudes to RP among business establishments and the effectiveness of PDS Reviewed

Ando, A., Morikawa, T., Miwa, T. and Yamamoto, T.

Proceedings of the 15th World Congress on Intelligent Transport Systems page： CD-ROM 2008.11

道路課金政策に対する事業者の賛否意識構造と駐車デポジット制度（PDS）の有効性に関する研究 Reviewed

安藤章，森川高行，三輪富生，山本俊行

都市計画論文集 Vol. 43 ( 3 ) page： 859-864 2008.10

Webシステムを活用した広域モビリティ・マネジメント実施効果と行動変容の分析 Reviewed

薄井智貴，三輪富生，山本俊行，森川高行

土木計画学研究・論文集 Vol. 25 ( 4 ) page： 1051-1062 2008.9

都心来訪者の駐車デポジットシステムに対する受容性に関する基礎的研究 Reviewed

三輪富生，新井秀幸，山本俊行，安藤章，森川高行

土木計画学研究・論文集 Vol. 25 ( 1 ) page： 165-174 2008.9

Preliminary Analysis on Link Travel Time for Probe-Based Estimation Method by Microscopic Simulation Reviewed

Li, Q., Miwa, T. and Morikawa, T.

International Journal of ITS Research Vol. 6 ( 1 ) page： 21-27 2008.7

PRELIMINARY ANALYSIS ON UPDATING DYNAMIC ORIGIN-DESTINATION MATRICES USING OBSERVED SPEED INFORMATION BY PROBE-VEHICLES Reviewed

Tomio MIWA, Toshiyuki YAMAMOTO, Tomonori TAKESHITA and Takayuki MORIKAWA

JSCE Journal of Infrastructure Planning and Management D Vol. 64 ( 2 ) page： 252-265 2008.5

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

This research aims at developing the technique for updating dynamic O-D matrices based on the information from probe-vehicles. However, probe-vehicle does not provide the information on the traffic counts and the observed speed varies among probe-vehicles even when the traffic condition is similar. We propose several techniques for estimating traffic counts from observed link travel speeds and the O-D matrices are updated based on the estimated traffic counts information. The results show that the O-D matrices updated by using the variance of estimated traffic counts or the number probe-samples as representing reliability of probe-information are more accurate than those by not using such indicators.

Analysis on Parking Pricing Policy with Discrete-Continuous Choice Model of Parking Location and Duration Reviewed

Tomio MIWA, Toshiyuki YAMAMOTO and Takayuki MORIKAWA

Journal of the City Planning Institute of Japan Vol. 43 ( 1 ) page： 34-41 2008.4

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

In the central city area, the vehicles queuing to the parking lot and/or illegally parked on-street cause serious road traffic congestion. This study develops discrete-continuous choice model of parking location and duration in order to better understanding drivers' parking behavior. We apply a simultaneous estimation technique to overcome an inconsistency of a conventional estimation result, and apply WESML estimator because of choice-based sample obtained from mail-in survey. As a result of the analysis concerning the parking price discount measure for reducing the illegal parking on-street, it was shown that the results with a discrete-continuous choice model were greatly different from those with a usual MNL model and a regression model.

ETCマイレージサービスの効果と新たな活用方法についての検討 Reviewed

佐藤仁美，三輪富生，森川高行

高速道路と自動車 Vol. 51 ( 2 ) page： 18-25 2008.2

Application of Time-Dependent Stochastic Equilibrium Assignment Model Considering Activity Choices to Nagoya Metropolitan Area Reviewed

Kanamori, R., Miwa, T. and Morikawa, T.

Journal of the Eastern Asia Society for Transportation Studies Vol. 7 page： 612-627 2007.12

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

This paper examines an applicability of the traffic assignment model overcoming some drawbacks of conventional models. The developed model has the following characteristics: 1) integration of trip generation (i.e. activity choice), destination choice, mode choice and route choice; 2) expression of traveler's choice behavior as a nested logit structure; 3) consideration of hourly traffic condition variations including queue evolution; and 4) approximate reproduction of trip chain along the time axis. The reproducibility of developed model is shown under application to the Nagoya Metropolitan Area, Japan. Furthermore, as case study, we evaluate road pricing and railway's fare discount. These results suggest that the model allows us to compare various TDM policies effectively and evaluate in detail.

活動選択を考慮した時間帯別・統合均衡モデルの構築と適用 Reviewed

金森亮，三輪富生，森川高行

土木計画学研究・論文集 Vol. 24 ( 3 ) page： 545-556 2007.11

時間帯別・確率的統合均衡モデルを用いた駐車デポジットシステムの導入評価 Reviewed

金森亮，森川高行，山本俊行，三輪富生

土木計画学研究・論文集 Vol. 24 ( 4 ) page： 915-926 2007.11

Applicability of Prevalent Sample Size Estimation Methods for Signalized Link Reviewed

Li, Q., Miwa, T., Yamamoto, T. and Morikawa, T.

Proceedings of the 14th World Congress on Intelligent Transport Systems page： CD-ROM 2007.10

都市圏レベルの交通需要予測手法の違いによる予測値の差の検証－確率的統合均衡モデルと非集計モデルの比較－ Reviewed

金森亮，三輪富生，森川高行

都市計画論文集 Vol. 42 ( 3 ) page： 565-570 2007.10

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