Faculty Profiles - YAMAMOTO Toshiyuki

Papers - YAMAMOTO Toshiyuki

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コミュニティバスの利用促進にバスマップが果たしうる役割に関する研究

杉浦栄紀，三輪富生，森川高行，山本俊行，加藤博和

土木計画学研究・講演集 Vol. 35 page： CD-ROM 2007

情報の信頼性と収集頻度を考慮したプローブカーの最適配置計画

石黒洋介，三輪富生，山本俊行，森川高行

土木計画学研究・講演集 Vol. 35 page： CD-ROM 2007

統合型交通支援システムによる情報提供と行動変化の分析

薄井智貴，剱持千歩，佐藤仁美，森川高行，山本俊行，三輪富生

Vol. 35 page： CD-ROM 2007

Fundamental study on new road pricing format from the perspective of acceptability Reviewed

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

Proceedings of the 14th World Congress on Intelligent Transport Systems page： CD-ROM 2007

Cost-effectiveness in probe vehicle systems Reviewed

Liu, K., Yamamoto, T., Li, Q. and Morikawa, T.

Journal of Eastern Asia Society for Transportation Studies Vol. 7 page： 116-127 2007

An empirical analysis on the expansion process of choice set integrating information search approach and cost-benefit approach Reviewed

Cheng Li, Toshiyuki Yamamoto and Takayuki Morikawa

Journal of Infrastructure Planning and Management Vol. 63 ( 1 ) page： 45-54 2007

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

This paper reports an empirical investigation on the expansion process of choice set integrating the information search approach and the cost-benefit approach. We hypothesized that the arising of interests in new alternative needs both initiative information search and considerable expected benefit. The latent mixture distribution structure equation models are developed and verified by a data set containing shopping behavior and attitudes. The results supported our hypothesis, suggesting that a lower satisfaction with the current set will incite external information search for all subjects, and that a higher expected benefit of expanding the choice set could induce a higher interest in new alternatives only when the considerable external information search was activated.

A study on possibility of reduction in car ownership by car sharing system Reviewed

Toshiyuki Yamamoto, Daisuke Kiuchi and Takayuki Morikawa

Journal of Infrastructure Planning and Management Vol. 63 ( 1 ) page： 14-23 2007

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

Maximal potential market for neighborhood car sharing is investigated considering optimization of car use within household. The maximal potential is not predicted from revealed or stated preference, but simulated based on the explicit rules that assign qualified travel demand by car to car sharing. Results of empirical analysis for Toyota City, Aichi Prefecture suggest that household fleet can be reduced by about 35% on weekdays and about 55% on weekends. Scale of the car sharing system is calculated that one vehicle per 10 households serves three trips a day. The results also suggest that potential demand is higher for households with light motor vehicles and areas close to train station.

多様な意思決定方略のモデリング

山本俊行

都市計画 Vol. 55 ( 6 ) page： 36-41 2006.11

Mode choice analysis with imprecise location information

Yamamoto, T. and Komori, R.

Proceedings of 11th International Conference on Travel Behaviour Research page： CD-ROM 2006.8

Advances in choice modeling and Asian perspectives

Yamamoto, T., Hyodo, T. and Muromachi, Y.

Proceedings of 11th International Conference on Travel Behaviour Research page： CD-ROM 2006.8

An empirical model of the acquisition of new alternatives into choice set combining information processing approach with cost-benefit approach

Li, C., Yamamoto, T. and Morikawa, T.

Proceedings of 13th Recent Advances in Retailing & Services Science Conference page： CD-ROM 2006.7

Inter-temporal and inter-regional analysis of household behaviors on car and motorcycle ownership in Asian metropolitan cities: bivariate ordered probit modeling approach

Nobuhiro Sanko, Dilum Dissanayake, Shinya Kurauchi, Hiroaki Maesoba, Toshiyuki Yamamoto and Taka Morikawa

Conpendium of Papers CD-ROM of the 85th Annual Meeting of the Transportation Research Board page： CD-ROM 2006.1

Language：English

This study investigates the household behavior on car and motorcycle ownership in Asian metropolitan cities of Nagoya, Bangkok, Kuala Lumpur, and Manila. The household attitudes and behaviors on vehicle ownership are modeled using bivariate ordered probit (BOP) models. The accessibility is generally known to be correlated with vehicle ownership decisions. Accordingly, the accessibility is incorporated as an input for the proposed vehicle ownership model to explore the potential relationship among them. The mode choice models for the cities concerned were initially developed to quantify the accessibility variables that were later integrated into the vehicle ownership models. Inter-temporal and inter-regional comparison, and temporal and spatial transferability analysis have brought insights into the vehicle ownership modeling.

多様な意思決定方略のモデリング

山本俊行

都市計画 Vol. 55 ( 6 ) page： 36-41 2006

How routine is a routine? an analysis of the day-to-day variability in prism vertex location Reviewed

Ryuichi Kitamura, Toshiyuki Yamamoto, Yusak O. Susilo and Kay W. Axhausen

Transportation Research Part A Vol. 40 page： 259-279 2006

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

This study is concerned with how routine an individual's routine really can be. This question is addressed by examining the day-to-day variability of the time coordinate of the vertex of a time-space prism; in other words, by examining how the timeframe which governs the individual's daily schedule varies from day to day. When the timeframe varies, it is likely that the individual's behavior also varies. When the timeframe is stable, on the other hand, a routine can be maintained. The analysis presented in this paper attempts to determine how much of the variation in travel is due to the variation in the timeframe. The origin vertices of workers' morning prisms, which determine how early they can leave home in the morning, are examined in this study, along with the departure times of the first trips in the prisms, which are mostly supposedly routine commute trips. The results indicate that the vertices are located with a much smaller variance, but vary more systematically than do the departure times of the first trips in the prisms. This implies that a large degree of variability is introduced when a trip is made within the timeframe as determined by a prism vertex. It is also shown that the departure time varies from worker to worker according to unobserved heterogeneity—i.e., unexplained differences across individuals—much more than does the prism vertex. The study results indicate that large degrees of flexibility are associated with trip making, and suggest the presence of room for behavioral modification with respect to workers' first trips in the morning.

An analysis of the cost efficiency of probe vehicle data at different transmission frequencies Reviewed

Kai Liu, Toshiyuki Yamamoto and Takayuki Morikawa

International Journal of ITS Research Vol. 4 page： 21-28 2006

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

Probe vehicles are promising tools for collecting travel time data because of their ability to provide large amounts of real-time information. However, there are many obstacles to the practical deployment of probe vehicles, one of which is the enormous expense of data transmission. This study attempts to assess the effects of differing transmission intervals (and therefore costs) on the quality of travel time data collected. Two accuracy/error values are examined: map-matching accuracy and the mean absolute percent error (MAPE) of link travel information. In order to determine the most cost-effective probe transmission frequency, the accuracy elasticity of cost is compared for six different ratios of data transmission charge to total communication cost.

Study on the cost-effectiveness of a probe vehicle system at lower transmission frequencies

Kai Liu, Toshiyuki Yamamoto and Takayuki Morikawa

Proceedings of 5th ITS Symposium 2006 page： 335-340 2006

Language：English

One serious problem of continuous large-scale data collection with probe vehicle is the dilemma of balancing the cost economization and system reliability improvements. The polling frequency is found to be the major factor that determines the operation cost of a probe vehicle-based traffic data collection system. This paper focuses on evaluating the cost-effectiveness of probe data at various space-based intervals, which are expected to provide roadway travel time estimation at certain reliability. The proposed optimization framework concentrates on the least total operation cost by combining the polling frequency and the required probe size, which gives a simple and valuable solution on the issue of cost-effective traffic data collection.

Improving the method of link travel time measurement from infrequent probe data

Kai Liu, Toshiyuki Yamamoto and Takayuki Morikawa

Proceedings of Infrastructure Planning Vol. 34 page： CD-ROM 2006

Analysis of effects of carsharing on car ownership and travel behavior

Toshiyuki Yamamoto, Hiroe Naruse and Takayuki Morikawa

Vol. 34 page： CD-ROM 2006

Estimating delay time at signalized intersections by probe vehicles Reviewed

Liu, K., Yamamoto, T. and Morikawa, T.

Proceedings of ICTTS 2006 page： 644-655 2006

An analysis of effects of rainfall on travel speed at signalized surface road network based on probe vehicle data Reviewed

Wang, L., Yamamoto, T., Miwa, T. and Morikawa, T.

Proceedings of ICTTS 2006 page： 615-624 2006

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Papers - YAMAMOTO Toshiyuki