Faculty Profiles - YAMAMOTO Toshiyuki

Papers - YAMAMOTO Toshiyuki

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路側障害物との接触事故による身体損傷程度の分析

山本俊行，Shankar, V.

大阪交通科学研究会平成13年度学術研究発表会講演論文集 2001

Computation of Destination Choice Probabilities under Huge Choice Sets: Application of Markov Chain Monte Carlo Algorithms Reviewed

Akira Kikuchi, Toshiyuki Yamamoto, kei Ashikawa and Ryuichi Kitamura

Infrastructure Planning Review Vol. 18 ( 3 ) page： 503-508 2001

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

A destination choice model is developed, using a coordinates-based methodology, to resolve the problems arising from zone systems on which most models developed so far are based. To evaluate destination choice probabilities and simulate choice simulation on a hypothetical uniform area is almost identical to the theoretical distribution, suggesting the validity of the MCMC method. From the result of a simulation run in Kyoto, it is confirmed that the MCMC method is a useful technique as a method of forecasting destination choice behavior with huge choice sets.

Accessibility in a Metropolis: Toward a Better Understanding of Land Use and Travel Reviewed

Ryuichi Kitamura, Takamasa Akiyama, Toshiyuki Yamamoto and Thomas F. Golob

Transportation Resaerch Record ( 1780 ) page： 73-94 2001

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

Travel survey data from two major metropolitan areas of Japan, taken at three time points spanning a period of 20 years, are analyzed and changes in travel characteristics and the spatial distributions of jobs and residences are examined. The two areas, the Kyoto-Osaka-Kobe (Kei-Han-Shin) metropolitan area and the Nagoya-Gifu (Chukyo) metropolitan area, developed along rail networks prior to the process of motorization began in the 1960's in Japan. Changes in travel characteristics in these two areas are examined using two sets of repeated cross-sectional data. The data cover the period from 1970 through 1990 in which these metropolitan areas experienced rapid growth and motorization. The analysis focuses on changes over time in mode use, commute trip length, daily travel time expenditure, and trip-chaining characteristics, and explores their associations with trip end location, residence and job locations, and other spatial factors. Changes in urban structure are inferred through the examination of the spatial distributions of job locations, residence locations, and activity locations. As a new indicator of urban structure, the spatial distribution of person-hours by activity type is proposed, and its effectiveness in portraying, along the time as well as spatial dimensions, the internal structure of an metropolitan area and the distribution of economic activities therein, is examined.

Sampling Alternatives from a Colossal Choice Set: an Application of the MCMC Algorithm Reviewed

Toshiyuki Yamamoto, Ryuichi Kitamura and Keiko Kishizawa

Transportation Research Record ( 1752 ) page： 53-61 2001

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

It is often the case that a discrete choice model cannot be applied to forecasting because the choice set is unmanageably large and choice probabilities cannot be evaluated in a practical manner. For example, an activity-based analysis of travel behavior often involves an astronomical number of potential activity-travel patterns, resulting in an enormous choice set when one attempts to formulate the behavior as a discrete choice. A colossal choice set makes it practically impossible to define the full choice set and to evaluate the choice probability of each pattern for forecasting. This paper demonstrates an algorithm to simulate individuals' activity-travel choice by sampling activity-travel patterns from a colossal choice set according to their choice probabilities as determined by a discrete choice model, without enumerating the full choice set. Numerical examples are presented to demonstrate the practicality and effectiveness of the algorithm in forecasting the effects on activity-travel patterns of transportation policy measures.

Markov Chain Monte Carlo Algorithm for Generating Activity-Travel Patterns Reviewed

Yamamoto, T., Kitamura, R. and Kishizawa, K.

Preprint CD-ROM of the 80th Annual Meeting of the Transportation Research Board 2001

Accessibility in a Metropolis: Toward a Better Understanding of Land Use and Travel Reviewed

Kitamura, R., Akiyama, T., Yamamoto, T. and Golob, T. F.

Preprint CD-ROM of the 80th Annual Meeting of the Transportation Research Board 2001

The Effects of a Periodic Vehicle Inspection Program on Household Vehicle Transaction Behavior Reviewed

Toshiyuki Yamamoto, Ryuichi Kitamura and Hiroaki Fujii

Journal of Infrastructure Planning and Manegement ( 667/IV-50 ) page： 137-146 2001

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

A hazard-based duration model of household vehicle transactions behavior is developed in this study to examine the effects of Japanese periodic inspection program, and an empirical analysis is carried out using the data set obtained by a panel survey conducted in Kyoto City. The results of model estimation suggest a higher probability of replacing or disposing of a vehicle whose inspection is scheduled within the next 6 months. Results of a simulation-based scenario analysis indicate that a raise in the inspection cost accelerates the replacement of vehicles households own without affecting the number of vehicles they own, and that the extension of the inspection period decelerates the scrappage of vehicles and increases the number of vehicles households own.

Weighted Estimation of Discrete Choice Models with Data from Complex Endogenous Sampling Reviewed

Ryuichi Kitamura, Hiromu Sakai and Toshiyuki Yamamoto

Journal of Infrastructure Planning and Management ( 667/IV-50 ) page： 103-111 2001

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

The methodology for weighting endogenous samples is extended in this study and applied to a multi-dimensional choice-based sample. It is shown that a unified weight exists for samples obtained from complex endogenous sampling schemes. Problems with conventional weighting methods for samples from endogenous sampling, such as roadside surveys, are pointed out and an improved weighting scheme is proposed. Coefficient estimates of discrete choice models with and without weights are compared, and the importance of applying an appropriate covariance estimator is pointed out.

An Analysis of Route and Departure Time Choice Behavior for Business Trip Chains Reviewed

Toshiyuki Yamamoto, Ryuichi Kitamura and Yoshiaki Kumada

Journal of Infrastructure Planning and Management ( 667/IV-50 ) page： 33-40 2001

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

Unlike commute trips, business trips are generated throughout business hours, and several destinations tend to be visited in a trip chain. In this study, a route and departure time choice model for a business trip chain is developed based on the hypothesis that the trip chain is made so as to minimize the total cost, including costs associated with other business activities before and after the trip chain, as well as costs associated with travel time, toll fees, and the probability being late. The empirical analysis is carried out using a data set obtained from a survey of business trip drivers. The properties of the estimated model are examined on a sample case

An Analysis of Vehicle Type Choice, Allocation and Use by Households Reviewed

Toshiyuki Yamamoto, Ryuichi Kitamura and Ichiro Kohmoto

Journal of Infrastructure Planning and Management ( 674/IV-51 ) page： 33-40 2001

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

Simultaneous vehicle type and main driver choice models and models of vehicle miles traveled are developed for one and two vehicle households separately. The types of vehicles are categorized as eight alternatives, and unobserved correlations among them are examined by adopting mixed multinomial logit models. The empirical results suggest that the vehicles are possibly reallocated in two-vehicle households at the transactions, that there exist inclinations toward specific types of vehicles among two-vehicle households, and that they have the tendency to obtain the same type of vehicles. The results also suggest that the vehicle miles traveled by respective vehicles in two-vehicle households are negatively interacted and that the vehicle types do not affect the vehicle miles traveled in two-vehicle households while they do so in one-vehicle households.

Optimizing the Duration, Survey Interval, and Sample Size for a Discrete Panel Study Reviewed

Ryuichi Kitamura, Satoshi Fujii and Toshiyuki Yamamoto

Journal of Infrastructure Planning and Management ( 691/IV-52 ) page： 13-23 2001

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

The problem of determining the interval between waves of panel surveys, the sample size, and the study duration is formulated in this study as an optimization problem in which the sum of the cost of estimation error and the cost of the survey is minimized. Numerical analyses using hypothetical parameter values indicate that the optimal sample size of a panel study can be much smaller, and the optimal inter-wave interval and the optimal study duration much shorter, than those values that have typically been used in previous panel studies.

フランス国立交通・安全研究所（INRETS）の概要と研究動向

山本俊行

交通科学 Vol. 31 page： 96-97 2001

フランス国立交通・安全研究所（INRETS）の概要と研究動向

山本俊行

交通科学 Vol. 31 page： 96-97 2001

カリフォルニア大気資源局（CARB）の電気自動車政策

山本俊行

運輸政策研究 Vol. 4 ( 2 ) page： 53-56 2001

An Analysis of Time Allocation, Departure Time and Route Choice Behaviour under Congestion Pricing Reviewed

Toshiyuki Yamamoto, Satoshi Fujii, Ryuichi Kitamura and Hiroshi Yoshida

Transportation Research Record ( 1725 ) page： 95-101 2000

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

Driver behavior under congestion pricing is analyzed in this study to evaluate the effects of alternative congestion pricing schemes. The analysis, which is based on stated-preference survey results, focuses on time allocation, departure time choice and route choice when a congestion pricing scheme is implemented on toll roads. A unique feature of the model system of this study is that departure time choice and route choice are analyzed in conjunction with the activities before and after the trip. A time allocation model is developed in this study to describe departure time choice, and a route and departure time choice model is developed as a multinomial logit model with alternatives representing the choice between freeways and surface streets and, for departure time, choice from among before, during, or after the period when congestion pricing is in effect. The results of the empirical analysis suggest that departing during the congestion pricing period tends to have higher utilities, and that a worker and a non-worker have quite different utility functions. The comparative analysis of different congestion pricing schemes is carried out based on the estimated parameters, and the results suggest that the probability of choosing each alternative is stable even if the length of the congestion pricing period changes, but that a higher congestion price causes more drivers to change the departure time to before the congestion pricing period.

Accessibility and travel: What can accessibility tell about land use and travel?

Kitamura, R., T. Akiyama and T. Yamamoto

Proceedings of Land Use and Travel Behaviour, International Conference, Amsterdam, MuConsult, B.V., Amersfoort. 2000

An Analysis of the Effects of a Periodical Vehicle Inspection Program on Household Vehicle Ownership Reviewed

Yamamoto, T., Kitamura, R. and Fujii, H.

Preprint of the 9th Meeting of the International Association for Travel Behaviour Research, Gold Coast 2000

On the Formulation of Time-Space Prisms to Model Constraints on Personal Activity-Travel Engagement Reviewed

Pendyala, R. M, Yamamoto, T. and Kitamura, R.

Preprint of the 9th Meeting of the International Association for Travel Behaviour Research, Gold Coast 2000

Analysis of effects of attitude, perception and unobserved heterogeneity on vehicle ownership reference Reviewed

Wu, G., Yamamoto, T. and Kitamura, R.

Preprint of the 9th Meeting of the International Association for Travel Behaviour Research, Gold Coast 2000

Application of PCATS/DEBNetS to Regional Planning and Policy Analysis: Micro-Simulation Studies for the Cities of Osaka and Kyoto, Japan Reviewed

Kitamura, R., Fujii, S., Yamamoto, T. and Kikuchi, A.

Proceedings of Seminar F, European Transport Conference 2000, PTRC Education and Research Services Ltd., London page： 199-210 2000

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Papers - YAMAMOTO Toshiyuki