次世代インフラシステム研究室 (Lab. for Innovative Infrastructure Systems)

スイス連邦工科大学 K.W. Axhausen教授，ベルリン工科大学 K. Nagel教授らが中心となって開発しているマルチエージェント交通シミュレーター “MATSim” の詳細解説本が出版されました．Open Access Bookとなっており，誰でも閲覧できます．

• Andreas Horni, Kai Nagel, Kay W Axhausen (eds.) 2016. The Multi-Agent Transport Simulation MATSim. London: Ubiquity Press. DOI: http://dx.doi.org/10.5334/baw

当研究室では，これまでにもMATSimを活用して，主に，旅行時間変動のもとでの最適経路誘導に関する研究を行ってきましたが，今回本書籍の1章分の執筆の機会を頂き，東京圏におけるシミュレーション分析の結果を紹介させて頂きました．卒業生のMaさん，山田さん，眞貝さんらの研究成果です．

• Chapter 92: “Tokyo: Simulating Hyperpath-Based Vehicle Navigations and its Impact on Travel Time Reliability” (by Daisuke Fukuda, Jiangshan Ma, Kaoru Yamada and Norihito Shinkai).

執筆の機会を頂いたAxhausen教授に感謝の意を表します．

モバイルビッグデータを用いたOD表推計・更新手法に関する研究論文が刊行されました．

“Updating origin-destination matrices with aggregated data of GPS traces”

By Qian Ge and Daisuke Fukuda

(Transportation Research Part C: Emerging Technologies, Volume 69, August 2016, Pages 291-312)

Abstract: The practice of estimating origin-destination (OD) demand usually requires large-scale travel surveys. To reduce the cost and time spent on surveys, individual trajectory data obtained from mobile devices has been used as an alternative dataset since the last two decades for OD estimation but also constrained in practice in some countries. To estimate OD matrices while protecting privacy, this study uses aggregated data of mobile phone traces to estimate work-related trips. The proposed approach is a sequential updater based on the maximum entropy principle. Trip production and attraction are firstly calculated by a non-linear programming problem followed by a matrix fitting problem to distribute trips to each OD pair. Numerical study shows that updated values are much closer to the synthesize real values than the referred ones. The case study in Tokyo further demonstrates that the proposed updating approach can track the change of travel pattern.

URL: http://dx.doi.org/10.1016/j.trc.2016.06.002

当研究室博士課程３年Yu Xiao君の博士論文発表会を下記のとおり執り行います．
ご感心ある方でご出席頂ける方は，福田(fukuda[at]plan.cv.titech.ac.jp)までご連絡いただけますと幸いです． 

発表者：Yu Xiao
論文題目： Valuing Travel Time Reliability: Individual, System and Dynamic
Perspectives
主査：福田大輔准教授
副査（予定）：朝倉康夫教授，屋井鉄雄教授，室町泰徳准教授，花岡伸也准教授，文世一教授（京都大学大学院経済学研究科）
日時：平成28年1月5日(火)  午前10時45分-12時15分
場所：東京工業大学　緑が丘5号館（創造プロジェクト館）1F大会議室

Three papers on para-transit in Asian cities (We newly call it “LAMAT – Locally Adopted and Modified Advancecd Transport”) have been published in Journal of EASTS: 

(1) By Tetsu BANDO and Daisuke FUKUDA and Achmad WICAKSONO and Lila Kurnia WARDANI,
Stated Preference Analysis for New Public Transport in a Medium-sized Asian City: A Case Study in Malang, Indonesia,
Journal of the Eastern Asia Society for Transportation Studies, volume 11, pages 1451-1466, 2015.
doi={10.11175/easts.11.1451}
This study analyzes citizens’ travel choice behavior in a medium-sized Southeast Asian city to observe their intention to use new public transport. We selected Malang in Indonesia as a case study. A travel behavior and intention survey including stated preference questions was conducted with university students. The results of the latent-class model of commute mode choices show that respondents could be divided into “cost and delay time” and “travel and access time” oriented classes. Respondents who were likely to convert to new public transport modes were male, had a higher income, and were interested in new public transport. The estimation results of the scheduling choices model confirm the significant difference in the sensitivity to recreation time between recreational activities.

(2) By Yasunori MUROMACHI, Iv LIM, Achmad WICAKSONO, Karl N. VERGEL, Kasem CHOOCHARUKUL, Van Hong TAN, Kiyohisa TERAI, Daisuke FUKUDA, Tetsuo YAI,
A Comparative Study on Road-based Urban Public Transport Policies in Six Asian Countries from the Viewpoint of Governance, Urban Planning, and Financial Aspects,
Journal of the Eastern Asia Society for Transportation Studies, volume 11, pages 1433-1450, 2015.
doi={10.11175/easts.11.1433}
In this study, we conducted an international comparative study on road-based urban public transport policies in six Asian countries: Cambodia, Indonesia, Japan, Philippines, Thailand and Vietnam. We paid attention especially to governance, urban planning and financial aspects as important background factors for considering road-based urban public transport policies. We found that the assignment of the administration on road-based urban public transport was different in the six countries. Among three urban planning measures, zoning for Transit Oriented Development and land development permission were implemented in all six countries. However, coordination with public transport through these two mechanisms was not necessarily established. In relation to financial policy for public transport, the six countries share many common policies. The exception in terms of the subsidy to paratransit was Japan where paratransit mode serviced in the area with serious population decrease.

(3) By Achmad WICAKSONO, Iv LIM, Yasunori MUROMACHI, Karl N. VERGEL, Kasem CHOOCHARUKUL, Van Hong TAN, Kiyohisa TERAI, Daisuke FUKUDA, Tetsuo YAI,
Road-based Urban Public Transport and Paratransit in Six Asian Countries: Legal Conditions and Intermodal Issues,
Journal of the Eastern Asia Society for Transportation Studies, volume 11, pages 227-242, 2015.
doi={10.11175/easts.11.227}
In this study, we present an international comparative study on urban public transport and paratransit in six Asian countries. The paper focuses on benchmarking legal aspects and intermodal issues among existing urban paratransit, aiming for a better future policy in fulfilling the need of urban population growth. Results indicate that many modes are actually has not yet been legalized in the six countries. From the typology of typical paratransit modes, it is found that there are still paratransit modes with fixed route that might respond to the travel demand enough for sustaining route service if the vehicle size is minimized. Finally, there are many cases where BRT and other public transport projects face the issue of restructuring of existing public transport network mostly with bus mode. Development of intermodal facilities is considered as one of the solutions for overcoming the issue. It is also noted that common ticketing system, or integration in terms of systems, should be regarded as an important measure for promoting the integration.

旅行時間信頼性に関する研究論文が刊行されました．

“On the cost of misperceived travel time variability”

By Yu Xiao and Daisuke Fukuda

(Transportation Research Part A: Policy and Practice, Volume 75, May 2015, Pages 96-112)

Abstract: Because individuals may misperceive travel time distributions, using the implied reduced form of the scheduling model might fall short of capturing all costs of travel time variability. We reformulate a general scheduling model employing rank-dependent utility theory and derive two special cases as econometric specifications to study these uncaptured costs. It is found that reduced-form expected cost functions still have a mean-variance form when misperception is considered, but the value of travel time variability is higher. We estimate these two models with stated-preference data and calculate the empirical cost of misperception. We find that: (i) travelers are mostly pessimistic and thus tend to choose departure times too early to achieve a minimum cost, (ii) scheduling preferences elicited using a stated-choice method can be relatively biased if probability weighting is not considered, and (iii) the extra cost of misperceiving the travel time distribution might be nontrivial when time is valued differently over the time of day and is substantial for some people.

URL: http://dx.doi.org/10.1016/j.tra.2015.03.014