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Toshiyuki Okamura

    Department of Regional　Development　Studies　Professor
    Course of Regional Development Studies　Professor
    Center for Sustainable Development Studies　Researcher
Last Updated :2024/04/10

Researcher Information

Degree

  • Doctor Engineering（Univ. of Tokyo）

Research funding number

  • 90314781

J-Global ID

Research Interests

  • 公共交通計画   都市交通   鉄道計画   交通工学   交通計画   Public transportation Planning   Urban transport   Railway planning   Transportation Engineering   Transportation Planning   

Research Areas

  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Civil engineering (environmental systems)
  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Civil engineering (planning and transportation)

Academic & Professional Experience

  • 2016/04 - Today  Toyo UniversityFaculty of Global and Regional Studiesprofessor
  • 2012/04 - 2016/03  Faculty of Regional Development Studies, Toyo UniversityProfessor
  • 2011/04 - 2012/03  Yokohama National University Institute of Urban InovationAssociate Professor
  • 2005/01 - 2011/03  Yokohama National University Faculty of EngineeringAssociate Professor
  • 1999/04 - 2004/12  IDEC, Hiroshima UniversityResearch Associate
  • 1999 - 2004  Graduate School for International Development and Cooperation

Education

  • 1996/04 - 1999/03  The University of Tokyo  Graduate School, School of Engineering  Department of Civil Engineering
  • 1994/04 - 1996/03  The University of Tokyo  Graduate School, School of Engineering  Department of Civil Engineering (master course)
  • 1992/04 - 1994/03  The University of Tokyo  Faculty of Engineering  Department of Civil Engineering
  • 1990/04 - 1992/03  The University of Tokyo  教養学部  理科I類

Association Memberships

  • THE JAPAN SOCIETY FOR INTERNATIONAL DEVELOPMENT   JAPANESE ASSOCIATION FOR AN INCLUSIVE SOCIETY   The Eastern Asia Society for Transportation Studies   交通工学研究会   日本都市計画学会   土木学会   Eastern Asia Society for Transportation Studies   Japan Society of Traffic Engineers   City Planning Institute of Japan   Japan Society of Civil Engineers   

Published Papers

Books etc

  • 自然災害科学・防災の百科事典
    日本自然災害 (Contributor第11章 都市災害 鉄道、p476 –p477)丸善出版 2022/01 9784621306642
  • 家田, 仁; 小嶋, 光信; 三村, 聡; 岡村, 敏之; 伊藤, 昌毅 (Editor第1部第1章.1：生活の質の向上に資する地域モビリティ 第1部第4章：まちづくりからみた再構築)薫風社 2021/08 9784902055412 291p
  • それは足からはじまった?モビリティの科学
    岡村 敏之; 家田 仁 (8.4 競争と共同のメカニズム)技報堂出版 2000/06 
    公共交通の競争と共同のメカニズムについて，事例を挙げて解説した．

Conference Activities & Talks

  • Factors Affecting Behavioral Intention toward Public Transport focusing on Walking Environment and Preference: A case of Phnom Penh City  [Not invited]
    Toshiyuki OKAMURA
    The 15th International Conference of the Eastern Asia Society for Transportation Studies 2023 (EASTS 2023)  2023/09  Oral presentation
  • Result of UBER and GRAB users' preference surveys conducted in 2016 and 2017  [Invited]
    OKAMURA Toshiyuki
    CoREST VI 2018  2018/05  Invited oral presentation
  • 都市における公共交通の役割  [Invited]
    岡村 敏之
    第35 回 ＥＳＴ創発セミナーｉｎはだの  2017/10  Keynote oral presentation
  • 白熱討論 「くらしの足の確保の先を見据えて」  [Not invited]
    岡村 敏之
    くらしの足をみんなで考える全国フォーラム２０１７  2017/10  Nominated symposium
  • 「自助」・「共助」と「地域公共交通事業」のはざまを探る  [Invited]
    岡村 敏之
    一般財団法人 地域公共交通総合研究所 第5回シンポジウム  2017/08  Invited oral presentation
  • Analysing behavioural intentions in new residential developments of motorcycle dependent cities: A case of Ho Chi Minh City, Vietnam  [Not invited]
    Hoang Le Quan; OKAMURA Toshiyuki
    The 14th World Conference on Transport Research  2016/07  Poster presentation
  • Identifying determinants of the intentions and the choices of mass rapid transit use in Ho Chi Minh City  [Not invited]
    Hoang Le Quan; OKAMURA Toshiyuki
    International Seminar on Transportation in Developing Countries  2016/06  Oral presentation
  • 途上国の都市公共交通の現状と今後の方向性  [Invited]
    岡村 敏之
    日交研シリーズ  2015/06  Oral presentation
  • OKAMURA TOSHIYUKI; NAKAMURA FUMIHIKO; WANG RUI
    土木計画学研究・講演集(CD-ROM)  2012/11  Oral presentation
  • SATO YASUHIRO; NAKAMURA FUMIHIKO; OKAMURA TOSHIYUKI; TANAKA SHINJI; WANG RUI
    土木計画学研究・講演集(CD-ROM)  2012/11
  • OBATA SHINJI; OKAMURA TOSHIYUKI; NAKAMURA FUMIHIKO; O EI
    土木学会年次学術講演会講演概要集(CD-ROM)  2012/08
  • OKAMURA TOSHIYUKI; NAKAMURA FUMIHIKO; OBATA SHINJI; WANG RUI
    土木計画学研究・講演集(CD-ROM)  2012/06
  • Attitudes of jeepney passengers in Metro Ma-nila, considering different lifestyles  [Not invited]
    岡村 敏之; Yutaro KanekoFumihiko; NakamuraRui WangJose Regin; F. Regidor
    11th International Congress of Asian Planning Schools Association  2011/09  Oral presentation 
    マニラにおいて，ジープニーをはじめとする公共交通利用者を主に対象として，自動車依存傾向とライフスタイルとの関係，複数の公共交通モードおよび自家用車の使い分けに関する態度について，調査分析を行った．
  • SHIMIZU KAZUHIRO; NAKAMURA FUMIHIKO; OKAMURA TOSHIYUKI; O EI
    土木学会年次学術講演会講演概要集(CD-ROM)  2010/08
  • Passengers’ preference on Urban Public Transport service in Nairobi  [Not invited]
    岡村 敏之; John; Ngatia GITHUIFumihiko; NAKA-MURA
    Proceedings of International Symposium on Engineering, Energy and Environment (ISEEE 2009)  2010/07  Oral presentation
  • The Structure of Users’ Satisfaction on Urban Public Transport Service in Nairobi  [Not invited]
    岡村 敏之; John; Ngatia GITHUIFumihiko; NAKAMURA
    11th World Conference on Transport Research  2010/07  Oral presentation
  • 大都市郊外地域における駅前地区の比較評価に関する研究  [Not invited]
    岡村 敏之
    土木計画学研究発表会・講演集  2006
  • 都市内の複雑なバス系統における時刻表表示の統一の試み  [Not invited]
    岡村 敏之; 藤原章正
    年次学術講演会講演概要集、土木学会  2004/09 
    広島都市圏で複数のバス系統が集中している区間を対象に、共通フォーマットの時刻表をバス停に掲示した社会実験を紹介し、時刻表デザイン共通化の効果や、実施上の問題点を整理した。
  • Finding behavioral rules of urban public transport passengers by using boarding records of integrate  [Not invited]
    岡村 敏之; 藤原章正; 張峻屹
    10th World Conference on Transport Research  2004/07 
    プリペイドカードデータを用い，代表的なデータマイニング手法であるCHAIDを用いて、マーケティングに有効な利用者類型化のためのルールの記述を行い，類型化されたグループの特徴を把握し都市公共交通のマーケティングへ適用した．
  • OKAMURA TOSHIYUKI; FUJIWARA AKIMASA; KOYAMA KEN
    土木学会年次学術講演会講演概要集 第4部  2001/09
  • 家田 仁; 岡村 敏之; 加藤 浩徳
    日交研シリーズ A  1997/05  Oral presentation

MISC

Awards & Honors

  • 2022/03 公益財団法人 交通協力会 第47回交通図書賞 第1部（経済・経営部門）
     地域モビリティの再構築 
    受賞者: 家田仁;小嶋光信(以上、監修)三村聡;岡村敏之;伊藤昌毅(以上、編著)
  • 第15回懸賞論文入賞 財団法人道路経済研究所
     
    受賞者: 岡村 敏之

Research Grants & Projects

  • 途上国における戦略的モビリティマネジメント推進のための政策パッケージの立案手法
    文部科学省：科学研究費 基盤研究(C) 一般
    Date (from‐to) : 2016/04 -2019/03 
    Author : 岡村 敏之
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2014/04 -2016/03 
    Author : NAKAMURA Fumihiko; OKAMURA Toshiyuki
     
    This Research seeks some sort of possibility that urban railways would become well known and popular by the citizen in developing countries. The research has been designed to measure how people in South-East Asian countries could be interested in urban railway journals, which are very popular in Japan and England. The research group has published two editions of urban railway journals focusing only on South-East Asian countries. After the publication, another surveys were conducted again in Thailand. The analysis results of the two surveys show us that unknown brand-new travel modes and Japanese ones could attract more people. In addition, attitudes to public transportation was found generally quite high. Therefore, the research concludes that these journals could be very informative and impressive for various age strata. This kind of activities could enhance the modal shift especially from private modes to public transport mode.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2011/04 -2014/03 
    Author : NAKAMURA FUMIHIKO; OKAMURA Toshiyuki
     
    This study clarified the requirement for development of design and assessment simulation system for intelligent Bus Rapid Transit system management and operation, based on the field surveys about advanced cases of BRT systems mainly in developing countries as well as in developed countries, taking into consideration the utilization of passenger capacity modelling, traffic simulation modelling and operations research modelling, aided with VISSIM traffic simulation software.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2012 -2014 
    Author : OKAMURA Toshiyuki; NAKAMURA Fumihiko; WANG Rui
     
    During the term of this grant, the researchers develop the survey methods for designing strategic mobility management measures in developing countries where current and potential private car/motorcycle owners are increasing and modal shift to MRT(Mass Rapid Transit) and BRT(Bus Rapid Transit) is strongly required. Based on the surveys in Manila (in 2012) , Ho Chi Minh City (in 2013 and 2014) and Lahore (2013 and 2014), researchers finally make a standardized questionnaire format to grasp intentions of using both public transport and private transport rationally focusing the service level of transport and images of each mode.
  • トリップチェーンに着目したカーシェアリングの都市内潜在需要の評価
    日産財団：研究助成
    Date (from‐to) : 2012/04 -2013/03 
    Author : 岡村 敏之
  • 短距離トリップの移動特性に着目した電気自動車によるカーシェアリングの可能性評価
    日産財団：研究助成
    Date (from‐to) : 2011/04 -2012/03 
    Author : 岡村 敏之
  • Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(若手研究(B))
    Date (from‐to) : 2009 -2011 
    Author : Toshiyuki OKAMURA
     
    This study focuses on boarding records of the IC card system in urban bus network in Tokyo. The record covers 4 month continuous data including the card ID, boarding place and time, alighting place and time. Characteristics of lines, bus stop and passengers are analyzed by the record in terms of fluctuation of day or time of the day. This study clarifies usefulness of the data for transport planning, operation and marketing.
  • 都市郊外住宅地の再生に向けた生活環境整備と都市公共交通整備との連携方策
    安藤記念奨学財団：研究助成
    Date (from‐to) : 2006/04 -2007/03 
    Author : 岡村 敏之
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2004 -2005 
    Author : FUJIWARA Akimasa; ZHANG Junyi; LEE Backjin
     
    In this fiscal year, the following two types of studies were conducted. (1)Comparative analysis of group discrete choice models in case of household vehicle type choice : Five operational models related to group discrete choice are dealt with : Multi-linear Model, Autocracy Model, Max-Min Model, Max-Max Model, and Minimum Endorsement Model. Based on a revealed preference data collected with respect to household car ownership and use in Hiroshima metropolitan area in 2004, it was confirmed that the model accuracies are all sufficiently high, but the differences are not significantly large. This suggests that there might exist several decision-making rules in this case study. It is also made clear that the sensitivity of vehicle body price in the multi-linear model is the lowest than that in other models, and the price sensitivity differs across vehicles. Therefore, in the application to policy analysis, one needs to carefully select the appropriate models. (2)Analysis of household residential choice based on a web-based stated preference survey : This study conducts a web-based stated preference survey to investigate households' preferences for moving to the assumed residential areas along the Astramline, a transit system in Hiroshima City in 2005. The respondents were asked to first report their actual group decision-making methods with respect to some major choice situations within their households. They were further asked to first separately, and then jointly choose the most preferred residential area and the commuting travel mode from a choice set, which also includes "not-move" as an alternative. It is found that joint decisions lead to the changes of members' preferences in about 40% of the household. It is also concluded that high-rising housing close to the Astramline could attract more people to live in and consequently contribute to the effective use of the transit system.
  • 文部科学省：科学研究費 若手研究（Ｂ）
    Date (from‐to) : 2004 -2005 
    Author : 岡村敏之
     
    都市公共交通(鉄道・バス等)では、磁気式やICカード式の乗車カード(プリペイドカード/定期券等)が普及しつつある。本研究は、都市公共交通の乗車記録データを、集計的な分析にとどまらず、行動軌跡データとして有効に扱うための手法を開発するものである。分析には、マーケティング等に用いられつつある「データマイニング手法」(大量のデータから、データサンプルの特性や傾向を発見していく手法)を用いる。昨年度は、カードデータを都市交通計画等に活用するためのデータベースの構築および問題点整理を行い、今年度は、以下の分析を行った。(1)広島都市圏の公共交通乗降データを用いて、1週間/1ヶ月単位といった一定の期間内での利用者の行動軌跡データから、利用者の行動特性および路線特性を、実際の地域のデータを用いて抽出した。その際、既存手法との比較も行った。(2)乗降データを用いたバスの運用効率化の効果の計測を行った。(3)実用化への課題の抽出(データ記録方式、分析手法等)以上の結果に基づき、カードデータなどの、大量かつ個人特定がある程度可能なデータの活用法を整理し、また現状のカードシステムと本研究による分析手法を結合したシステム開発への課題整理を行った。
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2002 -2003 
    Author : FUJIWARA Akimasa; SUGIE Yoriyasu; OKAMURA Toshiyuki; ZHANG Junyi
     
    This research project aims to develop evaluation methods of transportation project based on subjective values In 2002, this project aims to monetarily evaluate customers' subjective values including satisfaction with Low-Floor Light Rail Vehicle (LRV) by applying Contingent Valuation Method (CVM). Original surveys were conducted in Hiroshima targeted on tram users and residents along the tram route, A new method correcting the biases inherent in willingness-to-pay responses is proposed. As a result, it is found that the customer satisfaction for getting on and off the LRT would be improved by the introduction of the LRV. Moreover, a new method proposed in this study has capability to correct biases caused by survey design and to indicate the interval of the true subjective values In 2003, this project attempts to explore the sources of respondents' uncertainty regarding their willingness to pay (WTP) in CVM (Contingent Valuation Method). To capture the uncertainty in respondents' responses, the concept of certainty level for dichotomous choice response is introduced in CVM survey proposed in the previous year. Furthermore, an alternative approach based on fuzzy logic (i.e, fuzzy-CVM approach) is newly developed to incorporate the uncertainty into the WTP estimates. The approach can tackle the irreversible effects of WTP and WNTP (willingness not to pay). Moreover this paper addresses how to estimate the upper and lower values of WTP. Throughout an empirical analysis in Japan, it is shown that the respondents' WNTP is more sensitive to both bid amount and confidence level than the WTP. It is concluded that the Fuzzy-CVM can improve the reliability of the conventional CVM
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2001 -2003 
    Author : SUGIE Yoriyasu; OKAMURA Toshiyuki; ZHANG Junyi; FUJIWARA Akimawa
     
    This research is aimed at put an evaluation system to practical use, which can measure the effect of Intelligent Transportation System (ITS) as a proper travel demand inductive policy in local towns by applying our recent theoretical studies to practical road networks. For that purpose, the following studies have been done ; 1)to develop travel behavior models which can rationally consider the effects of ITS service use, 2)to develop micro-simulation methods, 3)to evaluate advanced transportation information system and 4)to develop the evaluation system. In the concrete, SP surveys were carried out concerning offering of various ITS user service and information. Based on the collected data, mode choice models were developed considering information acquisition behavior (i.e. information instrument choice and information acquisitive intention models). These models were derived from r-NL model which is a discrete choice model based on relative utility maximization theory. They have advantages which can estimate the effect of multi-modal information offer. That is, these models can estimate information acquisition behavior by different information offered, utility effects on mode choice and influence on mode choice by obtained information. Using these models, the effects of different offered service on mode choice was examined by simulation analysis. As a result, it was confirmed that incremental effects by recognized information is different over obtained information types and that shares of public transport increase by obtaining multi-modal information. Accordingly, it is concluded that this system can estimate individual travel behavior after offering information and the evaluation for advanced information system as a TDM policy can be properly measured.
  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 2001 -2002 
    Author : 奥村 誠; 藤原 章正; 山田 忠史; 高橋 勝彦; 塚井 誠人; 岡村 敏之
     
    本研究では、生産工学、輸送工学、交通工学、地域計画の分野から見たリサイクル物流の問題点を議論し、相互の関連性の共通理解を踏まえて今後の研究課題を抽出・整理することを第1の目的とした。その際、自動車、家電、建設産業などの先進的な企業等へのヒアリングや実務者の講演を実施し、実際的な議論を行うことができた。以上の議論を踏まえ、消費者や小売業のリサイクル行動および企業内における物流、在庫、生産の機能を統合化した概念モデルを構築と、それらの主要な関連関係を数量的に考察するためのシミュレーションモデルの構築を第2の目的とした。しかし消費者のリサイクル行動に関するデータの蓄積はなく、数量的な検討を行うことが困難であることがわかり、概念モデルに関する検討を行うにとどまっている。第3の目的は、リサイクルの進展が物流拠点・生産拠点の配置に及ぼす影響を明らかにすることであり、在庫コストを考慮した物流ネットワークの配置計画モデルのレビューを行い、日本国内の交通網データ、立地コストデータを当てはめて、立地行動のシミュレーションを行うことができた。第4の目的として、物流と生産の協調方策を提案してその効果を分析することとしていたが、システム全体の数量的な検討は困難であることから、再資源の生産活動への導入を考えた場合の企業の在庫管理モデルを集中的に開発した。 以上の研究の結果、対象とする製品によってリサイクルの形態が大きく異なるため、一般的なモデルを提案することは困難であるが、代表的な製品を取り上げた定量的な検討が必要であることがわかった。また、回収品と製品の荷姿や発生頻度が大きく異なることから、同一のトラックを用いた往復輸送は実際的でないため、拠点配置の問題も、既存の立地モデルに静脈側の物流コストを足しこむことによりある程度分析できることがわかった。
  • 文部科学省：科学研究費補助金(奨励研究(A))
    Date (from‐to) : 2000 -2001 
    Author : 岡村 敏之
     
    (1)「社会的圧力最小化投資行動」の検証昨年度に構築した「サービス-コストサブモデル」を用いて、東京圏、関西圏の大手民鉄事業者9社を対象に、各社の1967年以降の5カ年ごとの設備投資実績を表現することで、以下のことを明らかにした。・事業者は、単位サービス改善に対する限界費用が5円/分前後の水準で設備投資を行ってきた。・どの事業者も同様程度の限界費用で設備投資をしていることから、事業者は、利用者の時間価値がこの値前後であると認知して設備投資を行ってきたと考えられる。・ただしこの値は、他の交通モードにおける時間価値に比べて費用に低い値である。(2)「社会的圧力最小化投資行動モデル」から導かれる鉄道政策に対する提言鉄道事業者が設備投資を決定しそれを実行できるときとは以下のときであると言える。「当該事業者内の利用者間での内部補助が、利用者の感覚、制度の運用面の2点から見て容認されやすいとき(なぜなら、設備投資資金の回収が、基本的に、当該事業者の利用者間での内部補助(路線(区間)間/時間帯間/時代間)に依存しているため)」。またそれらの事業実施の結果としてサービスが向上(混雑率が低下)するのは、a)減価償却費の範囲内でサービス改善が可能な場合b)需要の伸びによる収益増加分(平均運営費用低減分も含む)を財源にして需要の伸び以上の容量増加投資が行える場合、などごく限定された場合に限られる。従って、鉄道事業者にとっての設備投資の実施可能性の高さと、鉄道利用者にとっての事業の必要性・逼迫性(=プロジェクトの有効性)とは、必ずしも一致しない。従って、必要性の高い事業が実施可能となるような制度が必要である。
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1999 -2001 
    Author : OKUMURA Makoto; SUGIE Yoriyasu; TSUKAI Makoto; KOMATSU Toshiko; OKAMURA Toshiyuki; FUJIWARA Akimasa
     
    In case of break down of water supply system by earthquake, use of ground water for drinking and utilities strongly helps emergent water distribution work, especially in the medium-size cities where huge investment for earth-quake proof water pipe line is not affordable. Ground water, however, can be contaminated by the break of sewage system, and its quality must be checked before use for drinking. In this study, we have studied two points concerning on emergent water supply: Ground water quality simulation system to increase the usability of it as drinking water, and water distribiition planning system. For the first viewpoints, this study proposes a procedure to select small number of test wells in order to diagnose the ground water quality of other wells in the region economically, based on the correlation among the wells. The procedure simulates transfer of contamination under every possible destruction pattern and evaluates expected water distnbution cost for the people around the risky wells. For the second purpose, we formulate the emergent water supply problem as a compound problem of a facility location problem to determine water supplying points, and a vehicle routing problem. The former is a problem. The former is a problem minimizes the number of supplying water points with the condition of covering of all residence places within the limit distance for water carrying. The latter is a problem which makes minimizes the total vehicle distance to distribute water to all water supplying points detemined above the facility location problem. Using heuristic methods, a calculation procedure to propose efficient water supply work in an emergency is established We apply this procedure to the Saijo area in Higashi-Hiroshima City. The influence of the destructions of water storages and bridges on the water supply work is calculated, and the effects of the pre-disaster earthquake-proof countermeasures for these facilities are analyzed.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 1997 -1999 
    Author : SUGIE Yoriyasu; OKAMURA Toshiyuki; FUJIWARA Akimasa
     
    The objective of this study is to develop dynamic models based on stated preference (SP) panel data. After three years study, the following research results are obtained. 1. Development of SP dynamic models The seven period panel data including SP data in 1987, 88, 90, 93 and 94 before the opening of the new light railway in Hiroshima, and RP data in 1994 and 97 are used in this analysis. It was clarified that the prediction accuracy and problems of SP models. 2. Time Series Analysis of Influence of TDM Measures The changes in participants and non-participants travel behaviors after introducing time spreading TDM measures, such as flexible time system and staggered working hours. It was found that there exist the adjusting and stable processes of travel behavior. The delay of drivers' responses against TDM measures appeared in traffic congestion.

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