Faculty Profiles - YAMAMOTO Toshiyuki

Papers - YAMAMOTO Toshiyuki

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A Study on the Fairness of Road-Pricing Reviewed

Sikyun Ryoo, Toshiyuki Yamamoto and Ryuichi Kitamura

Infrastructure Planning review Vol. 16 page： 707-715 1999

A Vehicle Ownership Preference Model that Incorporates the Causal Structure Underlying Attitudes towards Vehicle Ownership by Non-Owners Reviewed

Ge Wu, Toshiyuki Yamamoto and Ryuichi Kitamura

Infrastructure Planning Review Vol. 16 page： 553-560 1999

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

Household vehicle ownership behavior in earlier stages of motorization is governed by not only economic but also psychological and sociological factors. The study proposes the concept of “symbolic utility", which refers to psychological satisfaction from vehicle ownership. Based on analyses of the causal structure among attitudes towards and perception of vehicle ownership, a model system of vehicle ownership preference of non-owners is developed. The results suggest that attitudinal variables have effects on vehicle ownership preference, and the accuracy of vehicle ownership choice models could be improved by taking symbolic utility into consideration. The study results also indicate the presence of cognitive dissonance of non-owner households and “Veblen effects" of vehicle ownership.

A Simultaneous Choice Model of Monetary and Time Expenditures, Location, and Frequencies of Discretionary Activities Reviewed

Toshiyuki Yamamoto, Masayuki Abe, Satoshi Fujii and Ryuichi Kitamura

Infrastructure Planning Review Vol. 16 page： 561-567 1999

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

In this study, a simultaneous choice model system of monetary and time expenditures, location, and frequencies of discretionary activities is developed under the hypothesis that an individual attempts to maximize the total utility of engaging in activities, by adjusting the monetary and time expenditures, and frequencies of the activities. Mixing distribution models were combined with Tobit models to estimate the unknown parameters. The model components in the system were estimated sequentially. Estimation results using a data set from Kyoto city revealed the effects on the discretionary activities of the attributes of the individual, the travel circumstances as well as the attributes of the destination locations.

The Effectiveness of Land-Use Policies in High-Density Metropolitan Areas: An Energy Conservation Perspective Reviewed

Ryuichi Kitamura, Toshiyuki Yamamoto and Ryo Kamio

Journal of Infrastructure Planning and Manegement ( 625/IV-44 ) page： 171-180 1999

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

A structural equations models system, whose endogenous variables are household transportation energy consumption, work trip travel mode, vehicle holdings, and commute distance, is developed using the results of 1990 Kei-Han-Shin (Kyoto, Osaka and Kobe) household travel survey. The energy consumption characteristics of the household are explored using the model system, and the effectiveness of alternative land-use policies in reducing transportation energy consumption is evaluated by applying the model system while treating the commute distance as an exogenous variable. The estimation results indicate that it is possible to reduce household energy consumption by promoting high density land use development and encouraging job-residence proximity. In the Kei-Han-Shin metropolitan area where high-density and mixed land use already prevails and auto use is relatively low, however, an attempt to reduce household transportation energy consumption appreciably would require policies that target households of higher propensity toward energy consumption which tend to reside in the outskirts of the metropolitan area and commute long distances.

Vehicle Ownership Model That Incorporates the Causal Structure Underlying Attitudes Toward Vehicle Ownership Reviewed

Ge Wu, Toshiyuki Yamamoto and Ryuichi Kitamura

Transportation Research Record ( 1676 ) page： 61-67 1999

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

Household vehicle ownership behavior is governed by not only economic considerations but also psychological and sociological factors. The latter factors are expected to play important roles in earlier stages of motorization. Previous disaggregate models of household vehicle ownership behavior, however, have been developed mostly for countries with mature motorization and most often have included only economic factors as explanatory variables that determine the utility of a household vehicle. These models are limited as models of vehicle ownership behavior in earlier stages of motorization if psychological and sociological factors are in fact significant determinants of household vehicle ownership decision. Considered in this study is the concept of “Symbolic Utility" of vehicle ownership, which refers to psychological satisfaction from owning and using a vehicle. Based on analyses of the causal structure among attitudes towards vehicle ownership, a vehicle ownership model system is developed in the study. The results of this study suggest that attitudes towards vehicle ownership have effects on vehicle ownership preference, and the accuracy of vehicle ownership choice models can be improved by taking symbolic utility into consideration. The results of the model estimation also indicate the presence of cognitive dissonance of non-owner households and “Veblen effects" of vehicle ownership.

Competing-Risks-Duration Model of Household Vehicle Transactions with Indicators of Changes in Explanatory Variables Reviewed

Toshiyuki Yamamoto, Ryuichi Kitamura and Seiji Kimura

Transportation Research Record ( 1676 ) page： 116-123 1999

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

in this study. The model is developed assuming the following three types of competing risks: replacing one of the vehicles in the household fleet, disposing of one vehicle in the fleet, and acquiring one vehicle to add to the fleet. In addition to the attributes of household, changes in household attributes are expected to have strong effects on vehicle transactions behavior. To account for their effects, dummy variables indicating the occurrence of a change in selected household attributes are defined as time varying covariates and introduced into the model. In addition, vehicle transactions themselves change the needs and motivations for vehicles holding, affecting the timing and the type of the transaction that immediately follows. Dummy variables indicating the type of the preceding transaction are also introduced as time varying covariates into the model. The results of the empirical analysis using a data set collected in a panel survey empirically support the theoretical considerations underlying the model development, and indicate that the effects of changes in household attributes and that of a preceding transaction are well represented in the model.

An Analysis of Time Allocation to In-home and Out-of-home Discretionary Activities across Working Days and Non-working Days Reviewed

Toshiyuki Yamamoto and Ryuichi Kitamura

Transportation Vol. 26 ( 2 ) page： 211-230 1999

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

The behavior of time allocation to two types of discretionary activities is formulated as a doubly-censored Tobit model. The model is capable of incorporating cases where the entire amount of time available for discretionary activity is allocated to one type of activity and the other type of activity is not engaged at all. The model is applied to examine individuals' allocation of time to in-home and out-of-home discretionary activities on working days and non-working days, using a weekly time-use data set from the Netherlands. Workers' daily activity patterns vary significantly between working days and non-working days, while it can be expected that patterns of time allocation are correlated between working days and non-working days. A set of error components is introduced into the model to represent this correlation, adopting a mass point approach which requires no assumption about the distribution of the error components. The validity of the model is examined statistically.

A Development of Disaggregate Models of Household Vehicle Ownership for Earlier Stages of Motorization Reviewed

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

In Shanghai Institute of Traffic Engineering (ed.), A Better Urban Transportation for the New Century? '99 Shanghai International Symposium on Urban Transportation Proceedings page： 186-195 1999

A Competing Risks Duration Model of Household Vehicle Transactions That Accounts for the Effects of the Occurrences of Changes in Explanatory Variables Reviewed

Yamamoto, T. and R. Kitamura and S. Kimura

Preprint CD-ROM of the 78th Annual Meeting of the Transportation Research Board 1999

将来交通需要予測のため世帯属性生成システムの構築

西田悟史・山本俊行・藤井聡・北村隆一

土木計画学研究・講演集 Vol. 22 ( 2 ) page： 235-238 1999

消費行動の社会的依存性を考慮した自動車保有意識の分析

呉戈．山本俊行・北村隆一

土木計画学研究・講演集 Vol. 22 ( 2 ) page： 595-598 1999

豊田市を対象とした交通政策導入効果のマイクロシミュレーションを用いた分析

菊池輝・北村隆一・倉内慎也・佐々木邦明・花井卓也・藤井聡・森川高行・山本俊行

土木計画学研究・講演集 Vol. 22 ( 2 ) page： 817-820 1999

世帯における自動車利用の競合を考慮した交通機関選択行動の分析

梅木亮・山本俊行・北村隆一

土木計画学研究・講演集 Vol. 22 ( 1 ) page： 385-388 1999

世帯における自動車の車種選択と利用に関する一考察

河本一郎，山本俊行，北村隆一

平成10年度土木学会関西支部年次学術講演会講演概要 page： IV-31 1998

An Analysis of Time Allocation to In-home and Out-of-home Discretionary Activities across Working Days and Non-working Days Reviewed

Yamamoto, T. and Kitamura, R.

Preprint CD-ROM of the 77th Annual Meeting of the Transportation Research Board 1998

An Application of a Micro-simulator of Daily Travel and Dynamic network Flow to Evaluate the Effectiveness of Selected TDM Measures for CO2 Emissions Reduction Reviewed

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

Preprint CD-ROM of the 77th Annual Meeting of the Transportation Research Board 1998

保有意識の因果構造を考慮した自動車保有モデルの構築について

呉戈，山本俊行，北村隆一

土木計画学研究・講演集 Vol. 21 ( 1 ) page： 263-266 1998

個人の自由目的来訪活動における滞在時間・出費・来訪頻度同時選択モデルの構築

阿部昌幸，山本俊行，藤井聡，北村隆一

土木計画学研究・講演集 Vol. 21 ( 1 ) page： 371-374 1998

マイクロシミュレーションアプローチによるTDM・TCM政策の効果分析：京都市における交通政策による地球環境問題への対策の検討

藤井聡，菊池輝，北村隆一，山本俊行，藤井宏明，阿部昌幸

土木計画学研究・講演集 Vol. 21 ( 2 ) page： 637-640 1998

ロードプライシングの評価における公平性基準の適用可能性に関する一考察 Reviewed

柳時均，山本俊行，北村隆一

第18回交通工学研究発表会論文報告集 page： 169-172 1998

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Papers - YAMAMOTO Toshiyuki