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SEYA Hajime
Graduate School of Engineering / Department of Civil Engineering
Associate Professor

Researcher basic information

■ Research Keyword
  • Urban and Transport Planning
  • Regional Science
  • Infrastructure Planning and Management
  • Spatial Statistics
  • Geographic Information Science
■ Research Areas
  • Humanities & social sciences / Economic statistics / Spatial Statistics and Spatial Econometrics
  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Civil engineering (planning and transportation)

Research activity information

■ Award
  • 2023 Applied Regional Science Conference, Best Paper Award of ARSC

  • 2020 Applied Regional Science Conference, Sakashita Prize

  • 2015 Geographic Information System Association, GISA Awards

  • 2013 Applied Regional Science Conference, Best Paper Award of ARSC

  • 2012 Asian Real Estate Society, PhD Merit Awards

  • 2011 Japan Society of Civil Engineers (JSCE), Japan Society of Civil Engineers (JSCE) Best Paper Award

  • 2007 University of Tsukuba, President's Award

■ Paper
  • Hajime Seya, Taiki Asaoka, Makoto Chikaraishi, Kay W. Axhausen
    May 2024, TRANSPORTATION RESEARCH PART A-POLICY AND PRACTICE, 183, English
    [Refereed]
    Scientific journal

  • Kaito Ujiie, Atsushi Koike, Hajime Seya
    The concept of “equalization of healthcare services” refers to the elimination of regional disparities in healthcare services so that everyone can enjoy the right to receive high-level healthcare equally throughout the country. In order to study the policy of “equalization of healthcare services” in detail, it is essential to forecast the future demand and supply of healthcare services at district level. Hence the present study attempts to develop a simple demand forecasting model regarding the number of patients by district based on the gravity model. As a result of constructing the model in Hyogo Prefecture and visualizing the future changes in the demand for healthcare, it is shown that although there is an increase in demand due to the aging of the population in urban areas, there is a marked decrease in demand in many areas.
    Japan Society of Civil Engineers, 2024, Japanese Journal of JSCE, 80(2) (2), 23-00041, Japanese
    [Refereed]
    Scientific journal

  • Daisuke Murakami, Shonosuke Sugasawa, Hajime Seya, Daniel A. Griffith
    2024, GEOGRAPHICAL ANALYSIS, 56(4) (4), 768 - 798, English
    [Refereed]
    Scientific journal

  • Takahiro Yoshida, Daisuke Murakami, Hajime Seya
    Nov. 2022, THE JOURNAL OF REAL ESTATE FINANCE AND ECONOMICS, 69(1) (1), 1 - 28, English
    [Refereed]
    Scientific journal

  • Daisuke Murakami, Hajime Seya
    May 2022, FRONTIERS IN SUSTAINABLE CITIES, 4, English
    [Refereed]
    Scientific journal

  • Hajime Seya, Daiki Shiroi
    Apr. 2022, GEOGRAPHICAL ANALYSIS, 54(2) (2), 239 - 260, English
    [Refereed]
    Scientific journal

  • Shota Ishigooka, Tatsuhito Kono, Hajime Seya
    Dec. 2021, SUSTAINABILITY, 13(24) (24), English
    [Refereed]
    Scientific journal

  • Hajime Seya, Kazuki Yoshida, Satoru Inoue
    Jun. 2021, CASE STUDIES ON TRANSPORT POLICY, 9(2) (2), 693 - 702, English
    [Refereed]
    Scientific journal

  • Hajime Seya, Masashi Tomari, Shohei Uno
    Mar. 2021, APPLIED ECONOMICS LETTERS, 28(6) (6), 440 - 446, English
    [Refereed]
    Scientific journal

  • Takara Kunimi, Hajime Seya
    2021, JOURNAL OF TRANSPORT AND LAND USE, 14(1) (1), 25 - 45, English
    [Refereed]
    Scientific journal

  • Hajime Seya, Kay W. Axhausen, Makoto Chikaraishi
    Oct. 2020, ANNALS OF REGIONAL SCIENCE, 65(2) (2), 351 - 402, English
    [Refereed]
    Scientific journal

  • Yamamoto, Hiromichi, Koike, Atsushi, Seya, Hajime
    Apr. 2019, JOURNAL OF URBAN MANAGEMENT, 8(1) (1), 89 - 108, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Spatially filtered unconditional quantile regression: Application to a hedonic analysis
    Daisuke Murakami, Hajime Seya
    2019, ENVIRONMETRICS, English
    [Refereed]
    Scientific journal

  • Hajime Seya
    2019, APPLIED ECONOMICS LETTERS, 27(3) (3), 248 - 253, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • An overview of Asian studies on transport and land use
    Hajime Seya
    2018, ROUTLEDGE HANDBOOK OF TRANSPORT IN ASIA
    Scientific journal

  • SEYA HAJIME, 泊 将史, 力石 真
    The present study investigates the impacts of the entry of large-scale retail establishments on the sales and exits of existing local grocery or clothing retail stores in Japan. Similar to related cases in Europe and the US, in Japan as well, the findings of the existing studies are mixed. We examine this topic using micro data from the Japanese Census of Commerce from 1997 to 2014. The difference-in-differences method is used by controlling for the retail establishments' self-selection bias in terms of location selection by the use of the demand potential function, used in new economic geography literature. The empirical results indicate that the impacts vary based on the periods (short term versus long term), distance from entry locations (distance bands), size of entrants (in terms of floor size), and type of existing stores (grocery or clothing). For clothing stores, the impacts are basically negative on their survival and positive on the sales of surviving stores, especially in the long term. The impacts are stronger when the distance from entry locations is less than 1000 metres. For grocery stores, the tendencies of the impacts are similar to those for clothing stores, but the impacts are estimated to be much weaker. Further, this study provides possible policy implications based on the results.s
    Japan Society of Civil Engineers, 2018, 土木学会論文集D3 (土木計画学), 74(3) (3), 243 - 260, Japanese
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • 力石 真, SEYA HAJIME, 福田 大輔
    Evidence-based studies on social interaction (also known as non-market interaction) have been widely conducted mainly in the field of microeconometrics since 1990s, where crime, education, and labor market have been mainly focused on. Though a number of applications to infrastructure planning issues (such as illegal parking behavior, environmentally-friendly behavior, public acceptance behavior, evacuation behavior) can be found, recently, associated with population decline in Japan, the importance of taking into account such social interaction is getting more and more important: Potential applications include the issue of neighborhood revitalization, enhancing public transport use, and adaptation to mobility sharing service. In this study, based on the previous review works done by Fukuda et al. (2004) and Matsushima (2005), we overview the recent development of social interaction models in the field of microeconometrics, and discuss the potential application to emerging infrastructure planning issues.
    Japan Society of Civil Engineers, 2018, 土木学会論文集D3 (土木計画学), 74(5) (5), I_715 - I_734, Japanese
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hajime Seya, Junyi Zhang, Makoto Chikaraishi, Ying Jiang
    2018, TRANSPORTATION, 47(2) (2), 555 - 583, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Elderly's heterogeneous responses to topographical factors in travel mode choice within a hilly neighborhood: An analysis based on combined GPS and paper-based surveys
    Thi Anh Hong Nguyen, Makoto Chikaraishi, Hajime Seya, Akimasa Fujiwara, Junyi Zhang
    May 2017, EUROPEAN JOURNAL OF TRANSPORT AND INFRASTRUCTURE RESEARCH, 17(3) (3), 411 - 424, English
    [Refereed]
    Scientific journal

  • Daisuke Murakami, Takahiro Yoshida, Hajime Seya, Daniel A. Griffith, Yoshiki Yamagata
    Feb. 2017, SPATIAL STATISTICS, 19, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • 薦田 悟, 四辻 裕文, SEYA HAJIME, 喜多 秀行
    It is considered that there is a disparity of activity opportunities between urban and rural areas, because the level of transport service in rural areas is comparatively lower. Empirical studies have clarified the existence of disparity, but it is still questionable whether such disparity is caused by the differences in the level of transport service. Hence this study aims to examine the relationship between the level of transport service and activity opportunities. This study explored the relationship using the quantile regression analysis and the piecewise (segmented) regression with regard to the level of transport service. As a result, this study revealed that the level of transport service affects activity opportunities, and that the impact is particularly larger for the residents who live under the poor public transport service.
    Japan Society of Civil Engineers, 2017, 土木学会論文集D3（土木計画学）, 73(5) (5), I_879 - I_887, Japanese
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Ngoc An Huynh, Makoto Chikaraishi, Akimasa Fujiwara, SEYA HAJIME, Junyi Zhang
    The existence of complex tours could be a major barrier to the shift from car/motorcycle to public transport. To properly reflect such a barrier in evaluating the introduction of new public transport, a tour-based approach rather than a trip-based approach is required. However, to the authors’ knowledge, there is no study exploring the impacts of tour patterns on commuting mode choice where a “currently unavailable” travel mode is included as an alternative. This study proposes a simple method to identify the impacts of tour patterns on such stated commuting mode choice, where tour patterns are defined by the combination of tour complexity (represented by the number of trips in the stated preference (SP) survey) and trip flexibility (obtained in the revealed preference (RP) survey). For empirical analysis, we collected SP and RP data in Ho Chi Minh City, Vietnam. The results confirm the significant impact of tour patterns on mode choice decisions.
    Eastern Asia Society for Transportation Studies, 2017, ASIAN TRANSPORT STUDIES, 4(3) (3), 536 - 549, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Yoshiki Yamagata, Daisuke Murakami, Takahiro Yoshida, Hajime Seya, Sho Kuroda
    Jul. 2016, LANDSCAPE AND URBAN PLANNING, 151, 89 - 102, English
    [Refereed]
    Scientific journal

  • Hajime Seya, Takahiro Yoshida, Morito Tsutsumi
    Jul. 2016, JOURNAL OF TRANSPORT GEOGRAPHY, 55, 1 - 10, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hajime Seya, Kumiko Nakamichi, Yoshiki Yamagata
    Mar. 2016, TRANSPORTATION RESEARCH PART A: POLICY AND PRACTICE, 85, 123 - 134, English
    [Refereed]
    Scientific journal

  • David Perez Barbosa, Junyi Zhang, Hajime Seya
    Feb. 2016, INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH, 13(2) (2), English
    [Refereed]
    Scientific journal

  • Latest High-Resolution Remote Sensing and Visibility Analysis for Smart Environment Design
    Hajime Seya
    2016, REMOTE SENSING OF WATER RESOURCES, DISASTERS, AND URBAN STUDIES
    Scientific journal

  • 力石 真, 西川 文人, SEYA HAJIME, 藤原 章正, 張 峻屹
    This study proposes a model of shopping destination choice behavior incorporating non-market interactions among neighborhood inhabitants, where the attractiveness of retail markets in a neighborhood is defined based on the interactions. In empirical analysis, we apply the proposed model to the shopping behavior of people who lived in newtowns in Hiroshima. The main contributions of this study are: (1) we model “local-aggregate” social interactions, while most existing studies only deal with “local-average” social interactions, (2) our empirical results indicate that endogenous non-market interaction effects exist even after controlling exogenous and correlated effects, and (3) an existence of multiple equilibria is not confirmed in this particular empirical setting.
    Japan Society of Civil Engineers, 2016, 土木学会論文集D3（土木計画学）, 72(5) (5), I_595 - I_605, Japanese
    [Refereed]
    Scientific journal

  • Hajime Seya, Yoshiki Yamagata, Kumiko Nakamichi
    Jan. 2016, APPLIED ENERGY, 162, 1336 - 1344, English
    [Refereed]
    Scientific journal

  • Yoshiki Yamagata, Daisuke Murakami, Hajime Seya
    Nov. 2015, APPLIED ENERGY, 158, 255 - 262, English
    [Refereed]
    Scientific journal

  • Hajime Seya, Daisuke Murakami, Morito Tsutsumi, Yoshiki Yamagata
    Jul. 2015, GEOGRAPHICAL ANALYSIS, 47(3) (3), 284 - 299, English
    [Refereed]
    Scientific journal

  • Yoshiki Yamagata, Hajime Seya
    Feb. 2015, IET INTELLIGENT TRANSPORT SYSTEMS, 9(1) (1), 38 - 49, English
    [Refereed]
    International conference proceedings

  • Sachiho A. Adachi, Fuji Kimura, Hiroyuki Kusaka, Michael G. Duda, Yoshiki Yamagata, Hajime Seya, Kumiko Nakamichi, Toshinori Aoyagi
    Aug. 2014, JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY, 53(8) (8), 1886 - 1900, English
    [Refereed]
    Scientific journal

  • Hajime Seya, Morito Tsutsumi, Yoshiki Yamagata
    Apr. 2014, GEOGRAPHICAL ANALYSIS, 46(2) (2), 126 - 147, English
    [Refereed]
    Scientific journal

  • YAMAGATA Yoshiki, MURAKAMI Daisuke, SEYA Hajime, TSUTSUMI Morito
    One of the principal triggers of industrial agglomeration is the reduction of costs for business trips; business trip data-based analysis seems to furnish a lot of insights about industrial agglomeration. Fortunately, business trip data is provided every 10 years in Tokyo metropolitan area, though, to the best of the authors' knowledge, no studies have discussed spatial industrial agglomeration using its small zone-level detailed business trip data. This study analyzes spatial industrial agglomeration in the 23 wards of Tokyo utilizing the small zone-level data. Specifically, we first show that the spatial scan statistics, a test statistics of spatial agglomeration, is readily applicable to the business trip data, and, then, spatial industrial agglomerations of the business trips in each industry classification are analyzed by applying the statistics. Besides, we analyze the difference between the agglomerations of the business trips and those of the number of employees too.
    Japan Society of Civil Engineers, 2014, INFRASTRUCTURE PLANNING REVIEW, 70(5) (5), I_343 - I_351, Japanese

  • Kumiko NAKAMICHI, Yoshiki YAMAGATA, Hajime SEYA
    After the Tohoku Earthquake, the concept of urban resilience has been discussed widely in Japan. Resilient cities cannot be realized without considering energy and natural disaster risks. In this paper several land-use scenarios are used for the Tokyo Metropolitan Area in 2050 using a land-use model considering these two aspects. These scenarios consider the co-benefits of [i] change of urban form (compact city), [ii] adaptation to flooding risks, and [iii] diffusion of electric vehicles (EVs) and solar photovoltaic (PV) panels. Also, in this paper the effects of emission factor change on direct/indirect CO2 emissions due to the shutdown of nuclear power plants after the earthquake are analyzed. The results suggest that the diffusion of PVs is more important in the non-nuclear world to reduce CO2 emissions, and that EVs still can contribute to CO2 emission reduction despite changes in emission factor. Also, compact urban form can effectively reduce CO2 emissions.
    Eastern Asia Society for Transportation Studies, Dec. 2013, JOURNAL OF THE EASTERN ASIA SOCIETY FOR TRANSPORTATION STUDIES (EASTS), Vol.10, 1025 - 1044, English
    [Refereed]

  • Yoshiki Yamagata, Hajime Seya, Kumiko Nakamichi
    Informa UK Limited, Sep. 2013, ANNALS OF GIS, 19(3) (3), 153 - 168, English
    [Refereed]
    Scientific journal

  • Hajime Seya, Yoshiki Yamagata, Morito Tsutsumi
    May 2013, REGIONAL SCIENCE AND URBAN ECONOMICS, 43(3) (3), 429 - 444, English
    [Refereed]
    Scientific journal

  • YAMAGATA Yoshiki, SEYA Hajime
    This paper extends the concept of our proposed (Yamagata and Seya, 2012) community-based disaster resilient electricity sharing system (DRESS) as a complement or alternative to a feed-in tariff(FiT) to achieve CO2-neutral transportation in cities. In our proposed system, electricity generated from widely introduced solar photovoltaic panels (PVs) is stored in the"cars not in use "in a city. For example, almost half of the cars in the central Tokyo metropolitan area are used only on weekends and thus are kept parked during weekdays. These cars represent a huge new potential storage depot if they were replaced by electric vehicles (EVs), that is, they could be used as storage batteries in a V2G system. The present study extends our proposed system in the following two senses. Firstly, different from Yamagata and Seya (2012), this paper uses actual ground area data (footprint) of each building to estimate PV supply, which may lead to more accurate estimations. The results show that although the entire electricity surplus (PV supply minus demand) could be stored without waste if 12% of the EVs not in use were utilized as storage batteries at an aggregate (city) level,there exist significant regional mismatches at the local district level. Hence secondly, based on the geographical PV supply-demand estimates, this paper analyses the possibility of local electricity sharing by looking at the geographical distribution of high-storage potential areas using a spatial clustering technique. This paper extends the concept of our proposed (Yamagata and Seya, 2012) community-based disaster resilient electricity sharing system (DRESS) as a complement or alternative to a feed-in tariff(FiT) to achieve CO2-neutral transportation in cities. In our proposed system, electricity generated from widely introduced solar photovoltaic panels
    Japan Management Training Center, 2013, INNOVATION AND SUPPLY CHAIN MANAGEMENT, 7(3) (3), 75 - 82, English
    [Refereed]

  • Yoshiki Yamagata, Hajime Seya
    2013, APPLIED ENERGY, 112, 1466 - 1474, English
    [Refereed]
    Scientific journal

  • Kumiko NAKAMICHI, Yoshiki YAMAGATA, Hajime SEYA
    Scientific forecasts predict that climate change will be magnified, raising the risk of natural disasters in the future. The climate change will be gradual, but extreme weather events will increase in frequency and intensity. Vulnerability created by the water related disaster should be solved especially in Megacity which many assets are located. The realization of climate change mitigation and adaptation remain an urgent global issue. As a way of flood risk adaptation and CO2 emissions mitigation, it should be effective that people retreat from flood-hazard areas and realize compact city. It means climate change mitigation and adaptation is compatible. There is an urgent need to review synergy and trade-off between climate change mitigation and adaptation measures. The objective of this study is to develop an integrated evaluation system for direct and indirect CO2 emissions under land-use scenarios considering compact city and flood risk prevention and electric vehicles (EVs) and photovoltaic (PV) panels introduction scenarios, in order to assess both mitigation and adaptation measures. For creating the scenarios, this study used a spatially explicit land-use model at a local town level. Indirect emissions based on household's expenditure are also estimated in addition to direct emissions. In this study, the Tokyo Metropolitan Area, Japan, is selected as a case study to apply the system for assessment. The simulation results suggest that climate change mitigation and adaptation can generate a synergistic effect from the viewpoint of CO2 emissions.
    Japan Society of Civil Engineers, 2013, Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), 69(5) (5), I_381 - I_389, Japanese
    [Refereed]

  • 山崎,清, 堤,盛人, 小池,淳司, 瀬谷,創
    The computable urban economic (CUE) model, which is completely based on microeconomic foundations, is an advanced form of the urban model that was developed from land-use transport-interaction models; further, theCUEmodel is both operational and practical. In recent times, theCUEmodel has been widely used as a tool for analyzing real urban economies and evaluating the implementation of urban polices in practice. In this paper, we discuss the current issues and perspectives of CUE models. First, the significance of the CUE models is reiterated by providing an overview of its prehistory and a description of their characteristics. Subsequently, the paper lists the current issues from the viewpoints of model construction, identification, and application as well as its practical applications and propagation. Finally, the paper presents important perspectives on the issues and discusses the directions for further theoretical developments.
    Japan Society of Civil Engineers, Nov. 2012, INFRASTRUCTURE PLANNING REVIEW, 68(4) (4), 344 - 357, Japanese
    [Refereed]
    Scientific journal

  • Hajime Seya, Morito Tsutsumi, Yoshiki Yamagata
    Jan. 2012, ECONOMIC MODELLING, 29(1) (1), 60 - 71, English
    [Refereed]
    Scientific journal

  • Yoshiki YAMAGATA, Hajime SEYA, Kumiko NAKAMICHI
    The Tokyo Metropolitan Area is the largest urban area in the world. It is important to project the future distribution of population and land use in the area not only in terms of the urban planning, but also in terms of the mitigation and adaptation to climate change. This research studies spatially explicit high-resolution land use change scenarios in the metropolitan area with a newly developed land use model. In this study the microdistrict (cho-cho-moku) is used as the spatial analysis unit which allows realistic scenarios with fine spatial resolution to be constructed, whereas a traditional land use model is usually constructed at the municipality level. This study demonstrates two extreme scenarios—urban concentration (compact city) and dispersion for showing the maximum range of the future land use distribution. The projected land use distribution can be applied as the boundary condition for urban climate models, and also has a potential to provide useful information to urban practitioners. The developed scenarios provide the scenario dependent projections of parameters such as anthropogenic heat emission, vegetation cover, etc.
    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN, Jun. 2011, Environmental Science, 24(3) (3), 169 - 179, Japanese
    [Refereed]

  • Morito Tsutsumi, Hajime Seya
    As the sophisticated method to evaluate the benefits of infrastructural projects based on a property value method, a hedonic approach has been widely used. The application of a hedonic approach requires real estate data, which is generally spatially dependent. “Spatial hedonic approach” has been widely recognized and established in both research fields—spatial econometrics and geostatistics. However, no significant researches have evaluated the benefits of an infrastructural project using spatial hedonic approach. This study discusses the consistency in using spatial hedonic approach with the general procedure to calculate the amount of benefits. Then, the study presents empirical analyses by applying the Spatial Autoregressive Error Model (SAEM), based on the spatial econometrics approach, and the Spatial Process Model (SPM), based on the spatial statistics approach.
    Japan Society of Civil Engineers, 2010, Journal of JSCE, Series D, 66(2) (2), 178 - 196, Japanese
    [Refereed]

  • Morito Tsutsumi, Hajime Seya
    Dec. 2009, JOURNAL OF GEOGRAPHICAL SYSTEMS, 11(4) (4), 357 - 380, English
    [Refereed]
    Scientific journal

  • Morito Tsutsumi, Hajime Seya
    Aug. 2008, PAPERS IN REGIONAL SCIENCE, 87(3) (3), 385 - 401, English
    [Refereed]
    Scientific journal

■ MISC
  • 建築と交通を統合する未来都市のシミュレーション
    山形 与志樹, 瀬谷 創
    東京 : エネルギーレビューセンター, Apr. 2025, エネルギーレビュー = Energy review, 45(4) (4), 38 - 41, Japanese

  • A Guide to Applying Statistical Causal Inference Methods
    Hajime Seya
    東京 : 交通工学研究会 ; [1966]-, Apr. 2025, Traffic Engineering, 60(2) (2), 56 - 63, Japanese

  • 現代の東京一極集中と今後の展望—特集 国土の未来と今後の国土計画の役割
    瀬谷 創
    東京 : 日本地域開発センター, 2024, 地域開発, 648, 31 - 36, Japanese

  • 大規模な空間データを用いた住宅賃料の空間予測
    吉田 崇紘, 村上 大輔, 瀬谷 創
    東京 : 日本住宅総合センター, 2023, 住宅土地経済 / 日本住宅総合センター [編], (130) (130), 28 - 35, Japanese

  • 石郷岡 昇汰, 河野 達仁, 瀬谷 創
    公益社団法人 日本交通政策研究会, 2022, 交通政策研究, 2022, 28 - 29, Japanese

  • 空間無条件分位点回帰モデルによるコインパーキングの価格競争の分析
    瀬谷 創, カイ アクスハイゼン, 力石 真
    東京 : 日本住宅総合センター, 2021, 住宅土地経済 / 日本住宅総合センター [編], (120) (120), 9 - 15, Japanese

  • 平成22年度土木学会論文賞 受賞論文 便益計測への空間ヘドニック・アプローチの適用
    堤 盛人, 瀬谷 創
    日本測量協会, Nov. 2011, 測量, 61(11) (11), 14 - 16, Japanese

  • ヘドニック・アプローチを用いた便益評価と空間計量経済学・空間統計学
    堤 盛人, 瀬谷 創
    日本住宅総合センタ-, 2009, 住宅土地経済, (72) (72), 27 - 35, Japanese

■ Books And Other Publications
  • Spatial Analysis Using Big Data : Methods and Urban Applications
    Yoshiki Yamagata, Hajime Seya
    Editor, Academic Press, 2020, English, ISBN: 9780128131275

  • An overview of Asian studies on transport and land use, in Junyi Zhang and Cheng-Min Feng (eds.), Routledge Handbook of Transport in Asia
    Hajime Seya, Harry Timmermans
    Contributor, Routledge, 2018, English
    Scholarly book

  • The car-dependent life, in Junyi Zhang (eds.), Life-Oriented Behavioral Research for Urban Policy
    Junyi Zhang, Masashi Kuwano, Makoto Chikaraishi, Hajime Seya
    Contributor, Springer, 2017, English
    Scholarly book

  • Urban economics model for land-use planning, in Yoshiki Yamagata, and Hiroshi Maruyama (eds.), Urban Resilience: A Transformative Approach
    Yoshiki Yamagata, Hajime Seya, Daisuke Murakami
    Contributor, Springer, 2016, English
    Scholarly book

  • Spatial Statistics (in Japanese)
    Hajime Seya, Morito Tsutsumi
    朝倉書店, Mar. 2014, Japanese, ISBN: 9784254128314

■ Affiliated Academic Society
  • Japan Society of Traffic Engineers
    2016 - Present

  • Geographic Information System Association
    2015 - Present

  • Japan Society of Photogrammetry and Remote Sensing
    2006 - Present

  • Applied Regional Science Conference
    2006 - Present

  • Japan Society of Civil Engineers
    2006 - Present

■ Research Themes
  • 空間統計学と機械学習の融合による時空間回帰の開発・ツール化
    村上 大輔, 瀬谷 創, 菅澤 翔之助, 井上 亮
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 統計数理研究所, 01 Apr. 2024 - 31 Mar. 2029

  • 貿易ビックデータ解析による違法貿易プロファイリング
    布施 正暁, 瀬谷 創, 塚井 誠人, 野口 寛貴, 力石 真
    日本学術振興会, 科学研究費助成事業, 挑戦的研究(萌芽), 広島大学, 27 Jun. 2025 - 31 Mar. 2028

  • 統計的因果推論に基づく誘発交通需要の発生メカニズムの解明とエビデンス構築
    織田澤 利守, 瀬谷 創, 小池 淳司
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 神戸大学, 01 Apr. 2025 - 31 Mar. 2028

  • 都市狭域における交流促進に資する属性別滞在人口分析モデルの構築
    中西 航, 瀬谷 創, 杉浦 聡志, 中島 弘貴, 吉田 崇紘
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 金沢大学, 01 Apr. 2024 - 31 Mar. 2028

  • Extracting spatial heterogeneity latent in inter-regional relations: Advanced representation of spatial interactions and spatial correlation structures
    井上 亮, 瀬谷 創, 村上 大輔, 吉田 崇紘
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Tohoku University, Apr. 2024 - Mar. 2028

  • Study on scenario selection methods for evaluating the effectiveness of flood control measures under climate change
    瀬木 俊輔, 佐山 敬洋, 藤見 俊夫, 瀬谷 創
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, Apr. 2024 - Mar. 2027

  • 東京一極集中の要因の再検証
    瀬谷 創, 村上 大輔, 織田澤 利守, 瀬木 俊輔, 小池 淳司
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 神戸大学, 01 Apr. 2023 - 31 Mar. 2026

  • An Attempt to Improve Empirical Research in Economics Focusing on Statistical Hypothesis Testing
    瀬谷 創, 高野 佳佑
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory), Grant-in-Aid for Challenging Research (Exploratory), Kobe University, 30 Jun. 2022 - 31 Mar. 2025
    現在の統計学における中心的な手法は，統計的仮説検定である．近年，心理学や医学分野を中心に統計的仮説検定への疑問が投げかけられ，そこでの中心的概念となるp値の使用禁止まで明言する論文誌が現れるまでに至っている．一方で経済学では，このような動きへの反応は比較的遅かったといえるが，著名な国際誌で特集が組まれるなど，注目が高まっている．そこで本研究では，Neyman-Pearson流の統計的仮説検定の限界と補完・代替可能性について検討し，将来への道筋を立てることを試みる．具体的には，[I] 小標本における統計的仮説検定の限界と補完・代替可能性の検討，[II] ビッグデータにおける統計的仮説検定の限界と補完・代替可能性の検討を目的に研究に取り組む． 本年度は，現状のp値の使われ方の問題点を明らかにするために，土木学会論文集の二群の差の検定を例にしてデータベースの構築を行い，p-hackingの現状を調査した．

  • Designing convenient and sustainable demand responsible transport services in rural areas
    喜多 秀行, 瀬谷 創, 野口 寛貴
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2022 - 31 Mar. 2025
    過疎地域における生活の足を確保するため，コミュニティバスからタクシーや自家用車を活用した互助的な個別輸送サービスへの転換を図る自治体が増加しているが，もともと人口が少ない過疎地域においては，「必要な時に手頃な運賃で利用できる高い利便性」と「事業者とプロのドライバーによる高い信頼性と安定性」を兼ね備えたサービスを実現することが困難であり，それを打開しうる方策が求められている． 本研究課題は，両者を兼ね備えた新たな公共交通サービスの仕組み「準交通空白地有償運送(仮称)」を開発し，その実行可能性を行動分析，制度制約，運用方式等の観点から明らかにすることを目的としたものである． 2023年度は，ウェブ調査データを用いた互助による個別輸送型生活交通サービスの供給分析と需要分析，および両者の結果を用いた静的な需要-供給分析，フィールド調査の実施と調査データに基づく一次分析，フィールド研究の対象地区において具体の制度を設計するための環境整備を行った． 先行研究を含めて成果を随時社会に発信してきたこともあってか，本研究の進展と時を同じくしてわが国の公共交通関連法制度が徐々に本研究の目的に沿った方向に改正され，また，申請時には想定していなかったが，2023年夏頃からのライドシェア解禁を求める声の高まりの中で「準交通空白地有償運送(仮称)」が議論の題材に上がるなど，社会実装の気運が醸成されつつある．そのような中，人口分布やトリップ特性など地域環境に即した制度設計に必要な計画情報を早急に整備すべく，理論と実証の両面から研究を遂行している．

  • Development of a comprehensive evaluation method for medical equalization policy
    小池 淳司, 瀋 俊毅, 瀬谷 創, 谷原 真一, 青木 浩樹, 桑木 光太郎, 梶原 晃, 下村 研一
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2022 - 31 Mar. 2025
    本研究は，社会資本の中でも特に重要な医療の均霑化施策に着目し，権利のストック効果の計測のための包括的分析手法の構築を行うことを目的としている．医療の「均霑化」とは主に医療政策の分野で用いられる用語で，医療サービスの地域格差をなくし，全国どこでも誰もが等しく高度な医療を受ける権利を享受できるようにすることを目指しており，その中で交通整備に代表されるインフラストラクチャーの役割を明確にすることを目的としている．具体的には，需要面から①地域別将来患者数・病床数予測モデルの構築を行い小地域での医療需要の将来予測を可能にする．また供給面から②医療サービス供給モデルの構築を行い，地域における医療機関の参入・撤退要因を明らかにする．さらに，③両モデルを用いたシナリオ分析を通して，医療均霑化のための地域に応じた最適施策を提案し，社会資本が持つ権利のストック効果の定量化の方法を提案する． すでに，これらのモデル分析をすべて終え，様々な知見を得ることができた．特に，交通整備だけでは，医療の均霑化の実現は難しく，医療政策と同時に総合的に考えなければならないなどの結論が得られた．なお，最終年となるR6は各種政策提案の頑健性を確認すると同時に，公表に向けた準備を行う．

  • Extraction of multi-scale spatial heterogeneity
    井上 亮, 瀬谷 創, 村上 大輔
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Tohoku University, 01 Apr. 2021 - 31 Mar. 2025
    地理空間現象が有する性質の1つは，場所によってその生成過程が異なる空間的異質性である．空間的異質性分析において，生成過程に対して空間上で連続的な変化，および，ある境界線での離散的な変化の二種類の仮定が考えられてきた．昨年度までに，各地点における平均的な生成過程に存在する連続的・離散的な空間的異質性を分析する手法を構築してきたが，本年度はデータ分布の分位点や階級によって生成過程が異なることも空間的異質性と合わせて分析可能な手法を構築した． まず，分位点毎に空間的異質性構造が異なることを分析できる手法を開発した．連続的な異質性の分析に対して，空間可変係数モデルの一つであるESF-SVCと分位点回帰を融合した手法を，離散的な異質性の分析に対して，小地域毎に固有の係数を導入した分位点回帰にL1正則化を導入した手法を構築した．両者に対して，シミュレーションデータを用いた性能評価や不動産賃貸市場分析への適用を通して，提案手法の有効性を確認した． 次に，各場所で得られた階級などの分類の比率である組成の生成過程が有する空間的異質性の分析手法を開発した．連続的な異質性分析に対してESF-SVCを組成データ分析手法に融合した手法を，離散的な異質性分析に対して，小地域毎に固有の係数を導入した組成データ分析の回帰モデルにL1/L2正則化を導入した手法を構築した．分位点の分析と同様に，シミュレーションデータを用いた性能評価と，市町村単位の政党得票率や所得階層比率の分析を通して，提案手法の有効性を確認した． 以上のように，本年度は，地理空間現象の分布を表す二種類のデータに対して，連続的・離散的双方の空間的異質性に対する仮定に基づく分析手法を構築し，これまでの平均的事象の分析に留まらない多様な空間的異質性分析を可能とした．

  • Urban and transport planning theories towards enhancing positive externalities
    Chikaraishi Makoto
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Hiroshima University, 01 Apr. 2021 - 31 Mar. 2024
    The following three major studies were conducted during the research period. First, we proposed a framework to apply the Ostrom's theory of the commons to the context of regional public transportation, and its validity was confirmed through interviews and surveys. Second, we proposed a data collection, modeling and simulation method to describe the endogenous generation mechanism of social networks considering activity participation. Third, we developed a pedestrian behavior model that takes into account not only the negative externalities associated with increased pedestrian density but also the positive externalities caused by pedestrians staying on the street space.

  • Infrastructure and design for next-generation transport systems in the MaaS + CV era
    Iryo Takamasa
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Tohoku University, 01 Apr. 2020 - 31 Mar. 2024
    We aimed to establish methods for infrastructure and regulation design of next-generation transport systems combining Mobility-as-a-Service (MaaS) and Connected Vehicles (CVs). First, method analysing characteristics of DRT (Demand Response Transport) with shared rides was developed to improve the transport efficiency of MaaS. We have proposed methods for traffic controls that can be realised through the separation of user and transport operators by MaaS and by CV through control methods including lane number adjustment as well as signal controls, and an optimisation method based on heuristic processes. We also studied the characteristics of dynamic models based on evolutionary games and Markov chains as methodologies to support the above methods. Integrating the above findings, a performance evaluation tool for next-generation transport systems for large-scale networks was developed, and a case study was conducted to explore measures for the appropriate combination of MaaS and CV.

  • Ex-post evaluation of transportation infrastructure investments using a causal inference approach
    OTAZAWA Toshimori
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2020 - 31 Mar. 2023
    To establish a management cycle of infrastructure development, the improvement of ex-post evaluation is an important issue. In this study, we develop a method for measuring transportation infrastructure stock effect based on the statistical causal inference approach and examine its application to ex-post evaluation. First, through a comprehensive review of related studies, we summarize the issues for the establishment of stock effect measurement methods. Then, we propose a causal effect estimation method based on the instrumental variable approach for the development of Japan's expressway network. In addition, we focus on the spatial extent and heterogeneity of the stock effect, and develop and improve estimation methods based on the difference-in-differences approach. Finally, we organize and systematize our findings toward the realization of evidence-based ex-post evaluation.

  • An empirical study on the impacts of large-scale retail stores
    SEYA HAJIME
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2020 - 31 Mar. 2023
    The purpose of this study is to estimate the impacts of the opening and withdrawal of large retail stores through a comprehensive empirical analysis. Specifically, using the statistical causal inference approach and the structural estimation/behavioral model approach, [I] the causal impact of the opening and withdrawal of large retail stores on the region is estimated through statistical causal inference, and [II] as a theoretical contribution, a behavioral model is developed that considers the interaction between consumers and stores.

  • Redevelopment of theory in transport management during synergistic torrential rainfall disaster and its social implementation
    FUJIWARA AKIMASA
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Hiroshima University, 01 Apr. 2019 - 31 Mar. 2023
    The objective of this research project is to reconstruct the theoretical framework and implement it in society for the transportation management during heavy rain disasters, which are expected to occur frequently in the future. Focusing on the transportation network connecting Hiroshima, Kure, and Higashi-Hiroshima, the research involves both fundamental and applied studies from a behavioral perspective, including data collection, psychological and behavioral analysis, and policy evaluation, divided into four stages of recovery and reconstruction from the immediate aftermath to the recovery phase of the disaster. A series of developed methodologies were packaged and applied during the heavy rain disasters and large-scale events to verify their practicality and general applicability.

  • Challenges and new developments to the most important issues in spatial econometrics
    Tsutsumi Morito
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), University of Tsukuba, 01 Apr. 2018 - 31 Mar. 2023
    With the aim of solving and further developing the most important issues in spatial econometrics, the following were carried out. (1) Developing new models in spatial econometrics. (2) Presenting new modelling for dealing with big data, focusing on the dimensionality reduction approach. (3) Presenting the potential for new developments in spatial econometrics by applying compositional data analysis. (4) International workshops and The XV World Conference of the Spatial Econometrics Association (SEA 2021) in collaboration with the Spatial Econometrics Association.

  • Optimal level of infrastructure related expenses -theoretical and empirical approach-
    KOIKE Atsushi
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2019 - 31 Mar. 2022
    It is difficult to simply determine whether the level of Japan's public works expenditures relative to GDP is appropriate. This requires not only simple cross-country or time-series comparisons, but also theoretical, empirical, and structural approaches. Theoretical analysis examines optimality in the frame of economics. For the empirical analysis, we will conduct a statistical analysis of each country's social capital stock and public works expenditures and economic growth. The structural analysis focuses on the construction industry, the bidding system, and geographical factors, and analyzes the peculiarities of the cost structure of public works in Japan. Based on a comprehensive evaluation of these three analyses, we finally propose an optimal level of public works expenditures in Japan.

  • Cross-border Regional Development with Diverse Connectivity in Asian Developing Countries
    ZHANG JUNYI
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Hiroshima University, 18 Jul. 2018 - 31 Mar. 2022
    This research aims to review planning practices of border towns in Asian developing countries, reveal desirable development of the border towns with a variety of connectivity and propose methodologies to realize the desirable development. Findings from this research include, (1)correction of valuable primary data about both border town planning practices and cross-border mobilities, (2)clarifying factors affecting permanent residence in border towns, (3)evidence of place attachment formation and protection/creation of identities of border towns, (4)proposal of border town development strategies reflecting local contexts, (5)proposal of PASS approach for pandemic policymaking (closely related to cross-border mobilities), and (6) proposal of evidence-based packaged policies of pandemic control and the maintenance of tourism economic development.

  • Advanced use of trade statistics based on data fusion
    Fuse Masaaki
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Hiroshima University, 01 Apr. 2018 - 31 Mar. 2021
    This study aims to develop a method for create true trade volume from trade statistics based on data fusion approach. As the results, the study built an identification system of factors affecting the discrepancies with trade statistics. In addition, Non-negative Matrix Factorization method was applied into the discrepancies with trade statistics as a newly data fusion approach. Finally, the effectiveness of trade regulation to mercury and mercury added products in the Minamata Convention was evaluated from the perspective of the trade discrepancy.

  • Transport and land use model for next generation mobility and its uncertainty analysis
    Chikaraishi Makoto
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory), Grant-in-Aid for Challenging Research (Exploratory), Hiroshima University, 30 Jun. 2017 - 31 Mar. 2020
    We conducted a series of analyses to confirm the impacts of new mobility services (autonomous vehicles, and sharing services) and their uncertainties. The results imply that (1) the introduction of autonomous vehicle would affects the distribution of facilities and residential location, and (2) the diffusion of autonomous vehicles and its impacts would depend on the design of the vehicles and marketing strategies, indicating that high uncertainties would exist in the prediction results.

  • SEYA HAJIME
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Kobe University, Apr. 2017 - Mar. 2020
    Standard spatial econometric models assume that data is "clean" in that spatial data is complete and accurate in terms of attributes and locations. However, of course, real spatial data is "dirty." We attempted to develop spatial econometric models which are applicable to dirty spatial data. More specifically, we proposed two new models: (1) A spatial sample selection model, (2) A spatial unconditional quantile regression model, and the parameter estimation methods for these models.

  • Interdisciplinary research on policies promoting young people's migration to and permanent residence in local cities
    ZHANG JUNYI, JIANG Ying, ZHANG Linghan, ZHOU Tuqiang, ZONG Weiyan, YAMAMOTO Fuyo, PEREZ BARBOSA David, NUGROHO Setyo
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Hiroshima University, 01 Apr. 2015 - 31 Mar. 2019
    This study aims to provide scientific insights into revitalization policies for local cities of Japan, in which young people are willing to work and reside, from an interdisciplinary perspective. We have derived various significant findings/insights by integrating knowledge of the life-oriented approach (proposed/advocated by the principal researcher), local culture and public policy studies for decisions on effective policies promoting young people's migration to and permanent residence in local cities of Japan, in terms of clarifying the mechanisms of migration to and permanent residence in local cities, examining how to enhance the attractiveness of local cities, and creating employment opportunities that are also beneficial to the solutions of regional issues based on effective use of regional resources.

  • Spatial analysis and downscaling of inter-regional flow data with a consideration for spatial auto-correlation
    TSUTSUMI MORITO
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), University of Tsukuba, 01 Apr. 2015 - 31 Mar. 2018
    This study focuses on the analysis and spatial downscaling of inter-regional Origin -Destination (OD) Flow Data represented by regional traffic volume and trade volume data with a consideration for spatial autocorrelation which is one of the characteristics of geographical spatial data. The study analyses various OD flow data, such as industrial location and inter-municipality migration data and proposes a spatial clustering technique for OD flow. The study also proposes a statistical methodology and technique to predict OD flows in spatial downsclaing.

  • Mitigation Policies for Old Newtown Problem in Developing Countries in Asia
    FUJIWARA Akimasa
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Hiroshima University, 01 Apr. 2014 - 31 Mar. 2017
    This study proposes a new planning concept of "Self-containment" for sustainable neighborhood focusing on various newtowns with different development stages in developed and developing cities in Asia. Self-containment is an indicator of the extent to which residents can complete their daily activities inside the newtowns. This study developed an equilibrium model describing the interaction between travel behavior and physical and social conditions (i.e. social capital and social network) to measure the index. Based on the proposed concept, the study proposed neighborhood planning policies to mitigate the old newtown problem which will appear in developing world in the future. Finally, the study examines an approach to analysis the forward/backward propagation of neighborhood transportation policies between developed and developing cities.

  • SEYA HAJIME, TSUTSUMI Morito
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Apr. 2014 - Mar. 2017
    We developed new imputation method for spatially dependent missing data. The method attempts to apply spatial information to the prior distribution of missing values. We found that [1] By using spatial information for prior distribution, the imputation accuracy of some spatially auto-correlated explanatory variables can be improved (e.g., rent price, accessibility index). [2] Prior spatial information on missing data may not be effective for variables with a high {nugget/sill} ratio; in other words, the measurement error and/or micro-scale variation is dominant in total variation (e.g., FAR(Ratio) and age).

■ Academic Contribution Activities
  • Committee Member, Scientific Sub-Committee of Committee of Infrastructure Planning and Management
    Committee Member, Scientific Sub-Committee of Committee of Infrastructure Planning and Management
    2025 - Present

  • Steering Committee Member, Applied Regional Science Conference
    Steering Committee Member, Applied Regional Science Conference
    2024 - Present

  • Editorial Member, Journal of Japan Society of Civil Engineers D3
    Editorial Member, Journal of Japan Society of Civil Engineers D3
    2021 - 2023

  • Assistant to the Secretary-General, Committee of Infrastructure Planning and Management
    Assistant to the Secretary-General, Committee of Infrastructure Planning and Management
    2021 - 2022

  • Steering Committee Member, Applied Regional Science Conference
    Steering Committee Member, Applied Regional Science Conference
    2020 - 2021

  • Program Committee Member, Applied Regional Science Conference
    Program Committee Member, Applied Regional Science Conference
    2019

  • Assistant Editor, Asian Transport Studies
    Assistant Editor, Asian Transport Studies
    2015 - 2015

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