Details of the Researcher

PHOTO

Kazuaki Okubo
Section
Graduate School of International Cultural Studies
Job title
Associate Professor
Degree

  • 博士（学術）（東北大学）

  • 修士（情報科学）（東北大学）

e-Rad No.
50546744

Research History 5

  • 2021/04 - Present
    東北大学大学院国際文化研究科 准教授

  • 2018/12 - 2021/03
    Tohoku University　Graduate School of International Cultural Studies　Assistant Professor

  • 2017/04 - 2018/11
    Ehime University　Center for Disaster Management Informatics Research

  • 2013/04 - 2017/03
    Saitama University　Graduate School of Science and Engineering

  • 2009/04 - 2013/03
    Tohoku University　Center for Northeast Asian Studies　Assistant Professor

Committee Memberships 7

  • Asian Transport Studies　Assistant editor

    2017/04 - 2025/03

  • 土木学会 調査研究部門 土木計画学研究委員会 学術小委員会（分野A） 委員

    2021/04 - 2024/03

  • さいたま市　さいたま市環境影響評価技術審議会 委員

    2013/07 - 2017/06

  • 国土交通省　道の駅を活用した再配達削減社会実験協議会 委員

    2016/08 - 2017/03

  • 川口市　交通体系将来構想検討委員会 副委員長

    2016/04 - 2017/03

  • 環境省　市町村における収支及び制度のロバスト性検討会 委員

    2015/09 - 2017/03

  • 越谷市　地域公共交通協議会 副委員長

    2015/06 - 2017/03

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Professional Memberships 7

  • 廃棄物資源循環学会

    2018 - Present

  • Institute for Operations Research and the Management Science(INFORMS)

    2014 - Present

  • 応用地域学会

    2012 - Present

  • 都市計画学会

    2012 - Present

  • Eastern Asia Society for Transportation Studies

    2007 - Present

  • 土木学会

    2006 - Present

  • 環境経済政策学会

    2006 - Present

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Research Interests 2

  • 土木計画学

  • 地域計画

Research Areas 1

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

Awards 8

  1. 第40回春季研究大会「奨励賞」

    2021　日本マクロエンジニアリング学会　高等学校における SDGs 教育の実態分析 〜 東北地⽅の現状と課題を中⼼に〜

  2. 第40回春季研究大会「奨励賞」

    2021　日本マクロエンジニアリング学会　⺠間企業による古紙回収が廃棄物⾏政に与える影響分析〜スーパーの資源ゴミ回収ステーションを事例に〜

  3. 第39回秋季研究大会「奨励賞」

    2020/11　日本マクロエンジニアリング学会　資源回収ステーションにおけるリサイクル協力行動の特徴分析

  4. 第39回秋季研究大会「奨励賞」

    2020/11　日本マクロエンジニアリング学会　持続可能な開発目標達成に向けた環境教育の歴史的変遷と課題-ESD と SDGs 教育を中心に

  5. Telford Premium Prize

    2020/10　Institution of Civil Engineers

  6. 平成24年度 東北大学研究所連携プロジェクト 若手研究者賞

    2013/02

  7. 建設工学奨励賞

    2009

  8. 土木学会東北支部論文奨励賞

    2005

Show all ︎Show 5

Papers 54

  1. Social factors influencing the household solid waste generation and recycling rate in urban areas of Japan Peer-reviewed

    Zhuojiao Yu, Xiaoyue Liu, Jeongsoo Yu, Kazuaki Okubo

    Environmental Research Letters　20　(9)　094050-094050　2025/08/19

    Publisher: IOP Publishing

    DOI： 10.1088/1748-9326/adf97d 　

    eISSN： 1748-9326

    More details Close

    Abstract As population density and economic activities continue to grow in urban areas, household solid waste (HSW), especially household plastic waste (HPW), has become a pressing issue in Japan. This study aims to investigate the social factors influencing the generation and recycling rate of HSW and HPW in urban Japan. Using panel data from 105 cities across the years 2000, 2005, 2010, 2015, and 2020, we conducted an actual situation analysis and stepwise multiple regression analysis. Social factors were categorized into demographic (age, gender, income) and non-demographic factors, including economic, infrastructure-related, and HPW-related policy indicators. The actual situation analysis revealed a rise in HPW and stagnant recycling rates in Japan. Regression results confirmed several previous findings, such as older people generating less HSW and recycling more, and positive correlations between economic indicators and recycling rates. Novel findings include: (1) people aged 20–29 and those with higher incomes generate less HSW but more HPW; (2) females are negatively linked to recycling, possibly due to shifting gender roles; (3) higher power generation efficiency of incinerator facilities is statistically associated with higher HPW generation and lower HPW recycling, suggesting a structural trade-off in cities that focus on energy recovery rather than recycling HPW; (4) HPW-related policy indicators significantly improved both HSW and HPW performance. These findings highlight the complexity of urban waste management. By integrating both HSW and HPW dimensions and incorporating underexplored indicators, this study deepens understanding of localized HSW dynamics and offers targeted recommendations for enhancing municipal recycling systems in Japan.

  2. Residual Performance Evaluation of Electric Vehicle Batteries: Focusing on the Analysis Results of a Social Survey of Vehicle Owners Peer-reviewed

    Hongxia Chen, Xiaoyue Liu, Jeongsoo Yu, Kazuaki Okubo

    Sustainability　17　(10)　4685-4685　2025/05/20

    Publisher: MDPI AG

    DOI： 10.3390/su17104685 　

    eISSN： 2071-1050

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    In recent years, electric vehicles (EVs) have attracted much attention worldwide as an effective solution for realizing a carbon-neutral and decarbonized society. Since many batteries are generated over the lifespan of EVs, battery recycling has become an important issue. However, battery-manufacturing countries, including China, Japan, and South Korea (CJK), have yet to build a complete battery resource recovery system. In particular, owing to the lack of a reliable battery performance evaluation method, the residual performance of a battery cannot be accurately determined. Thus, based on the results of a social survey of EV owners, the present study develops a novel battery residual performance evaluation method that can easily predict the remaining battery performance based on the usage status of the vehicle, without relying on external electronic devices to measure the battery parameters. In addition, by clarifying the human factors deteriorating vehicle battery performance and proposing sustainable utilization methods for EVs, the present study demonstrates important research prospects for the protection of the environment and progress in the automobile industry.

  3. Spatial optimisation for managed retreat and nature-based solutions in climate adaptation Peer-reviewed

    Fuko Nakai, Seiya Kito, Kazuaki Okubo

    Sustainable Cities and Society　124　106246-106246　2025/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.scs.2025.106246 　

    ISSN： 2210-6707

  4. Identifying plastic materials in post-consumer food containers and packaging waste using terahertz spectroscopy and machine learning

    Kazuaki Okubo, Gaku Manago, Tadao Tanabe, Jeongsoo Yu, Xiaoyue Liu, Tetsuo Sasaki

    Waste Management　196　32-41　2025/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.wasman.2025.02.018 　

    ISSN： 0956-053X

  5. Development of smart material identification equipment for sustainable recycling in future smart cities International-journal Peer-reviewed

    Gaku Manago, Tadao Tanabe, Kazuaki Okubo, Tetsuo Sasaki, Jeongsoo Yu

    Polymers　17　(4)　2025/02/10

    Publisher: MDPI

    DOI： 10.3390/polym17040462 　

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    Waste recycling is critical for the development of smart cities. Local authorities are responsible for the disposal of waste plastics, but the extent of material recycling is insufficient, and much of the waste generated is incinerated. This conflicts with the trend of decarbonisation. Of particular note are the effects of the COVID-19 pandemic, during and after which large quantities of waste plastics, such as plastic containers and packaging, were generated. In order to develop a sustainable smart city, we need an effective scheme where we can separate materials before they are taken to the local authorities and recyclers. In other words, if material identification can be performed at the place of disposal, the burden on recyclers can be reduced, and a smart city can be created. In this study, we developed and demonstrated smart material identification equipment for waste plastic materials made of PET, PS, PP, and PE using GaP THz and sub-THz wavelengths. As basic information, we used a GaP terahertz spectrometer to sweep frequencies from 0.5 THz to 7 THz and measure the spectrum, and the transmittance rate was measured using the sub-THz device. The sub-THz device used a specific frequency below 0.14 THz. This is a smaller, more carriable, and less expensive semiconductor electronic device than the GaP. Moreover, the sub-terahertz device used in the development of this equipment is compact, harmless to the human body, and can be used in public environments. As a result, smart equipment was developed and tested in places such as supermarkets, office entrances, and canteens. The identification of materials can facilitate material recycling. In this study, we found that measuring devices designed to identify the PET and PS components of transparent containers and packaging plastics, and the PP and PE components of PET bottle caps, could effectively identify molecular weights, demonstrating new possibilities for waste management and recycling systems in smart cities. With the ability to collect and analyse data, these devices can be powerful tools for pre-sorting. Keywords: smart equipment; sustainable recycled polymers; waste plastic; sustainable circular economy; technology and innovation

  6. Identification of the Compounds Used in Waste Bottle Caps Using Terahertz Radiation for Sustainable Resource Recycling to Benefit International Cooperation

    Gaku Manago, Kazuaki Okubo, Jeongsoo Yu, Tadao Tanabe, Tetsuo Sasaki

    Sustainability　16　(24)　10864-10864　2024/12/11

    Publisher: MDPI AG

    DOI： 10.3390/su162410864 　

    eISSN： 2071-1050

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    In Japan, when people take their waste bottle caps to designated recycling companies, JPY 5/kg is donated to developing countries for polio vaccine dissemination activities. The waste volume of plastic bottles and caps is increasing every year, and there is not a day that goes by that we do not see more bottles and caps. PET bottles are more easily recycled, as the bottle body is made of a single material. However, bottle caps are made of two different materials (PP and PE), which are difficult to identify perfectly when utilising the existing NIR technology in the recycling field. This is because the designs and colours of PP and PE bottle caps are becoming more diverse, with black and dark-coloured caps being difficult to sort using NIR technology. In addition, their specific gravity is almost the same; therefore, it is difficult to separate them by their water-based specific gravity, which is an approach commonly used by recyclers. Unidentified caps are sent for thermal recycling, which runs counter to the need for decarbonisation. They may also be mixed with identified caps and sold as recycled raw material, resulting in a reduction in the purity of the recycled plastic. If PP and PE caps can be identified using simple technology, it is expected to promote high resource recycling. Therefore, in order to develop such a sorting process, this study proposes a new method for the material identification of waste caps using terahertz waves. Therefore, this research aims to identify a new identification method for waste plastic caps, which has been a challenge both domestically and internationally. Specifically, we describe the limitations of the conventional methods for identifying PP and PE bottle caps according to their weight, specific gravity, and melting point and propose an identification method using terahertz waves, demonstrating its measurement-related merits and high identification accuracy.

  7. Addressing the Problem of Poverty through an International Cooperation Project: The Case Study of Agriculture Development by JICA in Cameroon International-journal International-coauthorship Peer-reviewed

    Agho Oliver Bamenju, Xiaoyue Liu, Jeongsoo Yu, Kazuaki Okubo

    Earth　3　(4)　1185-1206　2022/11/11

    Publisher: MDPI

    DOI： 10.3390/earth3040068 　

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    In this era of globalization, with social problems extending across social and geographical boundaries, partnerships between governments and international organizations are key to achieving the Sustainable Development Goals (SDGs). Agriculture is essential to reducing poverty in Cameroon. Since 2002, the Japan International Cooperation Agency (JICA) has contributed to agricultural development through various projects in Cameroon. However, research has not been conducted to determine the contributions of agricultural development to poverty reduction. The aim of this study is to outline current agricultural problems and international cooperation projects in Cameroon. A social inquiry involving the collection of qualitative and quantitative data was conducted to assess whether agricultural projects have contributed to increasing income and alleviating other multidimensional indicators of poverty amongst the beneficiaries. In this paper, we provide useful recommendations with respect to solving the problem of poverty and achieving the SDGs. The analysis revealed that agriculture projects have significantly contributed to an increase in income, wellbeing and standard of living of the project beneficiaries. African countries, such as Cameroon, need to address poverty by improving the agricultural sector because these nations cannot currently maintain a stable crop production. International cooperation in the agricultural sector can help to increase crop yields, incomes and quality of life.

  8. New Challenges for Sustainable Plastic Recycling in Japan

    Jeongsoo Yu, Shiori Osanai, Kosuke Toshiki, Xiaoyue Liu, Tadao Tanabe, Gaku Manago, Shuoyao Wang, Kevin Roy B. Serrona, Kazuaki Okubo, Ryo Ikeda

    Global Blue Economy　395-412　2022/10/20

    Publisher: CRC Press

    DOI： 10.1201/9781003184287-14 　

  9. New Terahertz Wave Sorting Technology to Improve Plastic Containers and Packaging Waste Recycling in Japan Peer-reviewed

    Jeongsoo Yu, Xiaoyue Liu, Gaku Manago, Tadao Tanabe, Shiori Osanai, Kazuaki Okubo

    Recycling　7　(5)　66-66　2022/09/09

    Publisher: MDPI AG

    DOI： 10.3390/recycling7050066 　

    eISSN： 2313-4321

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    Plastic product consumption and disposal are widespread. Given that these products are derived from crude oil, it is critical to reduce their consumption and effectively recycle plastic waste as recycled resources to achieve a low-carbon society. Japan enacted the “Containers and Packaging Recycling Law” in 2000, encouraging the recycling of plastic packaging and containers. However, material recycling of plastic waste has stalled due to recycling costs and technical challenges. This paper examines and evaluates the transition process and operational status of Japan’s recycling policy for plastic containers and packaging, as well as clarifies the limits of resources recycling. The limits and issues of current identification technology are discussed by analyzing the characteristics of plastic marks and detecting the material compositions of waste samples. The paper also discusses a new sorting technology that uses terahertz waves to improve plastic recycling. This analysis revealed that plastic containers are typically made of two or more plastic materials, which makes resources recycling more difficult. Terahertz waves are safer than other high-accuracy sorting technologies currently in use. Thus, material recycling can be expanded by accurately analyzing the composition of plastic waste and introducing sorting devices appropriate for achieving the circular economy with sustainable resource recycling.

  10. Understanding Project Performance with Stochastic Interruption Peer-reviewed

    Okubo, K, Okumura, M

    14　(5)　2964　2022/03

    DOI： 10.3390/su14052964 　

  11. OPTIMAL RESIDENTIAL AREA MODEL FOR ANALYZING TRADE-OFFS BET WEEN SAFETY FROM TSUNAMIS AND ORDINARY CONVENIENCE Peer-reviewed

    Fuko NAKAI, Tatsuta UCHIUZO, Kazuaki OKUBO

    Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management)　77　(5)　I_431-I_447　2022

    Publisher: Japan Society of Civil Engineers

    DOI： 10.2208/jscejipm.77.5_i_431 　

    eISSN： 2185-6540

  12. Study on Effectiveness and Flexible Application of Recyclable Waste Collection Stations by Private Companies Peer-reviewed

    Xiaoyue Liu, Jeongsoo Yu, Kazuaki Okubo

    Journal of the Japan Society of Material Cycles and Waste Management　33　106-117　2022

    Publisher: Japan Society of Waste Management Experts

    DOI： 10.3985/jjsmcwm.33.106 　

    ISSN： 1883-5856

    eISSN： 1883-5899

  13. Case Study on the Efficiency of Recycling Companies’ Waste Paper Collection Stations in Japan Peer-reviewed

    Liu, X, Yu, J, Okubo, K, Sato, M, Aoki, T

    Sustainability　13　(20)　11536-11536　2021/10

    Publisher: MDPI AG

    DOI： 10.3390/su132011536 　

    eISSN： 2071-1050

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    Each year, a large amount of waste paper (WP) is generated in Japan, and due to the change in lifestyle with the COVID-19 pandemic, the WP collection and recycling system in Japan faces new challenges. Although the government of Japan has installed WP collection systems, the efficiency of these traditional WP collection systems is too low, and this causes inconvenience to the governments, residents, and other stakeholders. On the other hand, some recycling companies in Japan are trying to establish a nontraditional WP collection system by setting their own WP collection stations in cooperative supermarkets. Yet, the efficiency of this new system has not been clarified. This research aims to investigate the current status, operational characteristics, and the role of recycling companies’ WP collection stations in the Japanese WP collection system. By performing trade area analysis and stepwise OLS regression, this research will evaluate WP collection stations’ efficiency. Moreover, this research will also discuss how the new WP collection system improves WP collection efficiency and residents’ convenience. The results show that WP collection stations efficiency is particularly high in large supermarkets with many parking spaces and long business hours, as well as in areas with many families with children. Recycling companies’ WP collection system could create a system, which can satisfy resident, government, and recycling company interests at the same time.

  14. Life cycle assessment on automotive bumper: Scenario analysis based on End-of-Life vehicle recycling system in Japan Peer-reviewed

    Jin, H, Yu, J, Okubo K

    Waste Management & Research: The Journal for a Sustainable Circular Economy　1-10　2021/07

  15. Analyzing Urban Intensification and Disaster Risk Reduction Using the Optimal Land-Use Model Peer-reviewed

    Uchiuzo, T, Nakai, F, Okubo, K

    Conference Proceedings of 2021 IEEE 10th Global Conference on Consumer Electronics (GCCE)　2021

  16. Life cycle assessment on the reuse and recycling of the nickel‐metal hydride battery: Fleet‐based study on hybrid vehicle batteries from Japan Peer-reviewed

    Shuoyao Wang, Jeongsoo Yu, Kazuaki Okubo

    Journal of Industrial Ecology　25　(5)　1236-1249　2021

    Publisher: Wiley

    DOI： 10.1111/jiec.13126 　

    ISSN： 1088-1980

    eISSN： 1530-9290

  17. Present issues and efforts to integrate sustainable development goals in a local senior high school in Japan: A case study Peer-reviewed

    Kazuaki Okubo, Jeongsoo Yu, Shiori Osanai, Kevin Roy B. Serrona

    Journal of Urban Management　10　(1)　57-68　2021

    Publisher: Elsevier BV

    DOI： 10.1016/j.jum.2021.02.002 　

    ISSN： 2226-5856

  18. Analysis of the Efficiency of Various Waste Electrical and Electronic Equipment’s Collection Routes: A Case Study Focusing on Collection Route for Waste Mobile Phones in the Tohoku Area of Japan Peer-reviewed

    Xiaoyue Liu, Jeongsoo Yu, Kazuaki Okubo

    Recycling　6　(1)　13-13　2021

    Publisher: MDPI AG

    DOI： 10.3390/recycling6010013 　

    eISSN： 2313-4321

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    Each year, more than 5 million Waste Mobile Phones (WMP) is generated in Japan. Since WMPs contain many rare metals and precious metals, it is essential to collect and recycle high-value metal resources from them effectively. Although multiple stakeholders have already developed WMP collection routes, these WMP collection routes’ current status is unclear. Furthermore, some WMP collection routes can only collect a small number of WMP, and so, their resource efficiency is low. This research aims to clarify each WMP collection route’s characteristics and evaluate their resource efficiency by conducting interview research on related stakeholders and the WMP dismantle experiment. The result shows that local government, authorized recyclers, and telecom carriers are the major stakeholders in collecting WMPs in Japan. To improve the WMP collection rate in cities with high population densities, using the local government’s collection route and installing an authorized recycler’s collection station is considered to be more effective. In cities with low population densities, the collection stations built by authorized recyclers are sufficient. The collection stations can also improve recycling behavior by offering points. Furthermore, the telecom carriers are encouraged to participate in the WMP collection business, but they should figure out a way to monitor the flow route of secondhand phones they exported and prompt the proper recycling of exported phones.

  19. Estimation of End-of-Life Hybrid Vehicle number in Japan considering secondhand vehicle exportation Peer-reviewed

    Shuoyao Wang, Jeongsoo Yu, Kazuaki Okubo

    Waste Management　104　198-206　2020/03/01

    DOI： 10.1016/j.wasman.2020.01.022 　

    ISSN： 0956-053X

    eISSN： 1879-2456

  20. Scenario analysis on the generation of end-of-life hybrid vehicle in developing countries—focusing on the exported secondhand hybrid vehicle from Japan to Mongolia Peer-reviewed

    Shuoyao Wang, Jeongsoo Yu, Kazuaki Okubo

    Recycling　4　(4)　2019/12

    DOI： 10.3390/recycling4040041 　

    eISSN： 2313-4321

  21. 重み付き最適分類木の提案と公共施設マネジメントへの適用 Peer-reviewed

    大窪和明, 全邦釘

    土木学会論文集D3　75　(3)　158-171　2019

  22. Investigation and repair plan for abraded steel bridge piers: Case study from Japan Peer-reviewed

    Chun, P, Tsukada, K, Kusumoto, M, Okubo, K

    Forensic Engineering　172　(1)　11-18　2019

  23. 引張を受ける腐食鋼部材のディープラーニングによる有効板厚評価と有限要素モデリング Peer-reviewed

    全邦釘, 佐久間啓蔵, 大窪和明

    土木学会論文集A2　74　(4)　I_535-I_541　2018

  24. CRACK PROPERGATION MODEL OF CONCRETE BRIDGES IN SHIKOKU BASED DATA DRIVEN APPROACH Peer-reviewed

    岡崎百合子, 岡崎慎一郎, CHUN Pang-jo, 浅本晋吾, 大窪和明

    土木学会論文集 F4(建設マネジメント)(Web)　74　(2)　I_107-I_118　2018

    ISSN： 2185-6605

  25. 橋梁間の代替構造把握のための橋梁連関表と代替重要度の提案 Peer-reviewed

    大窪和明, 全邦釘

    土木学会論文集F4　74　(2)　I_119-I_129　2018

  26. 道路舗装の劣化速度に関する探索的空間データ分析 Peer-reviewed

    大窪和明, 全邦釘, 橋爪謙治, 藤田尚

    土木学会論文集E1　74　(3)　I_95-I_103　2018

  27. 廃PETボトルの落札額データを用いた市町村とリサイクル事業者の組合せ最適化問題 Peer-reviewed

    大窪和明, 全邦釘, 矢ヶ崎美香

    土木学会論文集D3　75　(5)　I_293-I_301　2018

  28. 災害時における緊急支援物資の最適輸送計画モデルの提案と適用 Peer-reviewed

    伊坂早織, 大窪和明

    土木学会論文集D3　75　(5)　I_259-I_268　2018

  29. ディープラーニングおよびrandom forestによるコンクリートのひび割れ自動検出手法 Peer-reviewed

    全邦釘, 嶋本ゆり, 大窪和明, 三輪知寛, 大賀水田生

    土木学会論文集F3　73　(2)　I_297-I_307　2017

  30. 車載カメラにより撮影された舗装画像からのディープラーニングによるひび割れ率評価 Peer-reviewed

    全邦釘, 井後敦史, 南免羅裕治, 黒木航汰, 大窪和明

    土木学会論文集E1　73　(3)　I_97-I_105　2017

  31. Method for investigating the integrity of widened narrow RC bridges and evaluating their safety Peer-reviewed

    Chun, P, Sakuma,K, Okubo, K

    American Journal of Civil and Environmental Engineering　2　(6)　67-74　2017

  32. Tensile strength prediction of corroded steel plates by using machine learning approach Peer-reviewed

    Cindy N. N. K, Chun, P, Okubo, K

    Steel and Composite Structures　24　(5)　2017

  33. Use of the time-space network technique for modeling gradual flooding and congestion delays during short-notice bus-based evacuations Peer-reviewed

    Qazi, A.N, Okubo, K, Kubota, H

    Journal of the Eastern Asia Society for Transportation Studies　12　2444-2461　2017

  34. NUMERICAL STUDY ON OPTIMUM ROUTE OF EVACUATION ASSISTANCE BUS BASED ON FLOOD INUNDATION MODEL FOR KAWAJIMA TOWN Peer-reviewed

    73　(4)　313-318　2017

    Publisher:

    ISSN： 1880-8751

  35. 複数管理者による交通ネットワークにおける接続脆弱性評価 Peer-reviewed

    大窪和明, 鈴木春菜

    土木構造・材料論文集　32　49-58　2016

  36. Demand variations and evacuation route flexibility in short-notice bus-based evacuation planning Peer-reviewed

    Qazi, A.N, Nara, Y, Okubo, K, Kubota, H

    IATSS Research　41　(4)　147-152　2016

  37. Short-notice bus-based evacuation under dynamic demand condition Peer-reviewed

    Qazi, A.N, Okubo, K, Kubota

    Asian Transport Studies　4　(1)　228-244　2016

    Publisher: Eastern Asia Society for Transportation Studies

    DOI： 10.11175/eastsats.4.228 　

    ISSN： 2185-5560

    More details Close

    In the literature on bus-based evacuation planning for short-notice evacuations, researchers have assumed either a known fixed number of evacuees or a single bus trip to the shelter on specified evacuation routes, or both of these constraints. These constraints distance their models from real-world situations, where evacuees continuously arrive at pickup points and multiple bus trips are required for the economical use of a limited number of buses. In this study, a bus-based evacuation model has been proposed to evacuate a known number of total evacuees who arrive at pickup points continuously. Evacuees are placed in shelters using multiple trips of the available buses with flexible route options. Furthermore, using the model, efforts have been made to investigate the factors affecting bus-trip assignment through a case study of flood evacuation planning for Kawajima Town in Saitama Prefecture. Two cases with warning times of 90 min and 60 min are presented. The overall bus capacity for trips to the shelter was observed to be 90−96%, which indicated the model's efficient performance when modeling multiple trips.

  38. 将来予測値の誤差に対する廃棄物焼却施設更新・廃止戦略の安定性 ―多時点施設配置モデルによる分析― Peer-reviewed

    大窪 和明, 奥村 誠, 吾妻 樹

    土木学会論文集　71　(G-71(3))　82-92　2015/05

    Publisher: Japan Society of Civil Engineers

    DOI： 10.2208/jscejer.71.82 　

    eISSN： 2185-6648

  39. 更新・廃止計画のための多時点最適施設配置モデル Peer-reviewed

    大窪 和明, 奥村 誠, 吾妻 樹

    土木学会論文集　70　(D3-70(5))　I-211-220　2014/12

    Publisher: Japan Society of Civil Engineers

    DOI： 10.2208/jscejipm.70.I_211 　

    eISSN： 2185-6540

  40. 震災時における消費者のガソリン購入行動に関する研究 Peer-reviewed

    大窪和明, 奥村誠, 河本憲

    応用地域学研究　(18)　17-28　2014/10/01

    ISSN： 1880-960X

  41. ダム貯水池の渇水軽減効果のアウトカム評価手法 Peer-reviewed

    奥村誠, 田中大司, 大窪和明

    土木学会論文集D3　48　(5)　I_221-I_228　2014

  42. AROBUSTOPTIMIZATIONAPPROACHFOR SMALL SIZE HOME ELECTRICAL APPLIANCE RECYCLING SYSTEM Peer-reviewed

    Kazuaki Okubo, Makoto Okumura, Seiya Taira

    土木学会論文集　69　(D3-69)　687-695　2013/12

    Publisher: Japan Society of Civil Engineers

    DOI： 10.2208/jscejipm.69.I_687 　

    ISSN： 2185-6540

    More details Close

    The increased use of recycled and renewable resources is important for achieving sustainable society. The Ministry of Environment in Japan is planning to introduce legislation for promoting recycling of Small size home electrical appliance and exploring efficient collection system by involving recycling industries. The recycling industries face significant uncertainty in quantity of collected Small size home electrical appliance. Some papers and collection experiments point out variation of collection amount and such uncertainties create disincentives for recycling. We propose a recycler model of Small size home electrical appliance with uncertainty in the amount of collection and examine the effect of introducing budget of uncertainty. We showed that the average profit is increased by considering the budget of uncertainty, when the recycler faces large uncertainty. We found that the standard robust optimization approach, that assume the worst case scenario, does not always minimize the risk, there may exist more desirable scenario.

  43. Estimation of Residential Experience based on the Pre-residing Prefecture Data in the Japanese Population Census Peer-reviewed

    Makoto Okumura, Jinyoung Kim, Kazuaki Okubo

    Journal of the City Planning Institute of Japan　48　(3)　933-938　2013/10

    DOI： 10.11361/journalcpij.48.933 　

  44. Sequence Analysis of Needs for Relief Goods in Great East Japan Earthquake Peer-reviewed

    OKUMURA Makoto, BUNPHONG Kento, OKUBO Kazuaki

    Transport Policy Studies　16　(1)　59-67　2013/04

    Publisher:

    ISSN： 1344-3348

  45. 待ち時間を考慮した施設選択モデルと震災時給油問題への適用 Peer-reviewed

    岩坂友也, 大窪和明, 奥村誠

    都市計画論文集　47　(3)　997-1002　2012

  46. 壮年者人口移動における世代間バランスの影響 Peer-reviewed

    奥村誠, 大窪和明

    都市計画論文集　47　(3)　751-756　2012

  47. FLUCTUATIONS AND RESPONSES IN USED PRODUCT COLLECTION SYSTEMS Peer-reviewed

    Kazuaki OKUBO, Makoto OKUMURA

    Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management)　68　(5)　I_1013-I_1024　2012

    Publisher: Japan Society of Civil Engineers

    DOI： 10.2208/jscejipm.68.i_1013 　

    eISSN： 2185-6540

  48. A STUDY OF HIERARCHICAL ORGANIZATION LOCATION MODEL FOR SERVICE INDUSTRY ENTERPRISE

    Makoto OKUMURA, Naoki TAKADA, Kazuaki OKUBO

    Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management)　67　(4)　408-421　2011

    Publisher: Japan Society of Civil Engineers

    DOI： 10.2208/jscejipm.67.408 　

    eISSN： 2185-6540

  49. 全国幹線旅客純流動調査の鉄道サンプル拡大方法に関する研究 Peer-reviewed

    奥村誠, 山口裕通, 大窪和明

    土木学会論文集D3　67　(5)　I_911-I_918　2011

  50. Exploring Knowledge Acquried by Information Exchange Through Social Network in Aging Societ Peer-reviewed

    Okubo, K, Okumura, M

    Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management)　67　(5)　I_399-I_406　2011

    Publisher: Japan Society of Civil Engineers

    DOI： 10.2208/jscejipm.67.67_i_399 　

    eISSN： 2185-6540

  51. 多階層最適企業組織配置モデルに関する研究 Peer-reviewed

    奥村誠, 高田直樹, 大窪和明

    土木学会論文集D3　67　(4)　408-421　2011

  52. Optimal Seismic-Proof Reinforcement Planning, considering Inspection Time of Expressway Links Peer-reviewed

    Kazuhiro Sasaki, Makoto Okumura, Kazuaki Okubo

    Infrastructure Planning Review　27　(1)　193-200　2010/09

  53. An Analysis of the Closed-Loop Facility Location, Considering the Variability of Used Products Peer-reviewed

    Kazuaki Okubo, Makoto Okumura

    Infrastructure Planning Review　27　(2)　417-424　2010/09

  54. Examining Walras Tatonnement Processes of BADS: The Case Of The Japanese SCrap Papers Market Peer-reviewed

    Okubo, K, Inamura, H, Kagawa, S

    (1)　77-86　2007

Show all ︎Show first 5

Misc. 47

  1. Analysing Trade-offs and Synergies in Land Use for Flood Resilience and Compactness

    Fuko Nakai, Seiya Kito, Kazuaki Okubo

    2025/01/20

    Publisher: Copernicus GmbH

    DOI： 10.5194/egusphere-egu24-13450 　

    More details Close

    As cities globally face climate change risks, they are increasingly adopting innovative climate adaptation policies, including 'Nature-based Solutions (NBS)' and advanced planning and social policies. However, the implementation of these strategies by local governments remains limited. Integrating these strategies into urban governance requires interdisciplinary collaboration and inclusive interventions to overcome existing governance inertia (Hölscher et al., 2023). Effective policymaking must align these innovative strategies with new narratives considering wider urban development goals, fostering synergies and co-benefits (Keith et al., 2023). Multi-objective optimisation models play a key role here, involving stakeholders in generating and evaluating alternative land use proposals within spatial decision-making processes. These models focus on balancing competing objectives, using Pareto-optimal solutions to find practical compromises in urban development.Our focus is on exploring (1) flood-resilient land use and (2) the compatibility of land uses between prioritising flood resilience and compactness, through scenario-based analysis using land use spatial optimisation (LUSO). The target is Toyohashi City, a central city in Japan, which confronts issues dealing with flood risk and strategic land use under the shrinking population. In previous LUSO models, the unit of each objective is different; therefore, it has been difficult to discuss its marginal cost (Yoon et al., 2017). To address this issue, our model adopts the city's 'profit' as a scalarised objective of LUSO, encompassing revenue and expenses influenced by flood resistance, compactness, and minimal land use conversions. (1) Flood-resilient land use is analysed under two types of hazard scenarios: 'uncertain' and 'deterministic'. These scenarios reflect our understanding of which part of the levee might break during a flood. In the 'uncertain' scenario, the specific point of the levee breach is unknown, leading the city to incorporate flood considerations into land use planning across the entire area. Conversely, the 'deterministic' scenario operates on the assumption that the weak point in the levee is known, thereby focusing hazard considerations only on the area surrounding the anticipated breach point. (2) The compatibility of land uses is examined by comparing the land use pattern of ‘never considering compactness’ with that of ‘never considering flood occurrence’. As a result of two analyses, we found that the 'uncertain' scenario is not better than the 'deterministic' scenario in terms of the city’s total 'profit': ensuring equity of flood hazard risk may be costly. In addition, the compatibility analysis identified specific areas that could confront trade-offs between flood avoidance and urban development. This research contributes to understanding the complex dynamics of land use planning in the context of climate change adaptation and demographic shifts.Hölscher et al. (2023) ‘Strategies for Mainstreaming Nature-Based Solutions in Urban Governance Capacities in Ten European Cities’. Npj Urban Sustainability 3, no. 1. https://doi.org/10.1038/s42949-023-00134-9.Keith et al. (2023). ‘A New Urban Narrative for Sustainable Development’. Nature Sustainability 6, no. 2: 115–17. https://doi.org/10.1038/s41893-022-00979-5.Yoon et al. (2017) ‘Multi-Objective Land-Use Allocation Considering Landslide Risk under Climate Change: Case Study in Pyeongchang-Gun, Korea’. Sustainability (Switzerland) 9, no. 12. https://doi.org/10.3390/su9122306.

  2. テラヘルツ波を利用した廃プラスチック識別装置

    佐々木哲朗, 田邉匡生, 劉庭秀, 眞子岳, 大窪和明

    光アライアンス　35　(4)　2024

  3. 二段階確率計画法を用いた防災土地利用計画の検討

    大窪和明,中居楓子

    土木計画学研究・講演集　70　2024

  4. テラヘルツ波の実用化技術の進展と応用展開

    佐々木哲朗, 田邉匡生, 劉庭秀, 眞子岳, 大窪和明

    OPTRONICS　2023/06

  5. テラヘルツ波による廃プラスチック高度識別装置の開発

    佐々木哲朗, 田邉匡生, 劉 庭秀, 眞子 学, 大窪和明

    オプトロニクス　12　(6)　89-93　2023/06

  6. Analysing Trade-Offs between Safety from Tsunamis Risk and Views of Ocean Water Using an Optimal Residential Area Model

    Fuko Nakai, Tatsuya Uchiuzo, Kazuaki Okubo, Eizo Hideshima

    EGU General Assembly 2023　EGU23-4088　2023/05/15

    Publisher: Copernicus GmbH

    DOI： 10.5194/egusphere-egu23-4088 　

    More details Close

    Disaster risk reduction has become an increasingly prominent concern in urban planning due to recent catastrophic disasters such as the Great East Japan Earthquake in 2011. Building levees or relocating to higher ground are measures used to reduce the risk of tsunamis. However, if those measures are implemented too extensively, they may obstruct views of coastal water that benefit residents. Environments where residents can visually access the waterfront are crucial for promoting awareness of river and disaster risk reduction and repairing the way we interact with nature. However, in Japan, safety has frequently been prioritized by ignoring the views of coastal water that may be lost.This study developed an optimal residential area model for analysing the trade-offs between safety from tsunamis and views of coastal water (hereafter, ocean views), which will be able to support detailed urban planning. The model comprises weighted multicriteria, that is, the total tsunami risk and ocean views with controlling optimal allocations of population. Here we optimized “Improved Potential Achievement (IPA).” This indicated the extent to which the respective optimal value achieved has been achieved against the value (improved potential) of the two objectives being optimized alone as a baseline. We used the viewshed analysis to quantify ocean views. The analysis used the elevation value of each cell of the digital elevation model (DEM) to determine the visibility of a particular point of the ocean from a specific residential mesh. Using the visibility between specific locations, we conceptualized the index of “the ocean view presence” and “the width of the ocean view”. The ocean view presence expresses how many locations in a particular residential mesh have an ocean view. Meanwhile, the width of the ocean view expresses whether people have a panoramic view of the open ocean or whether they can only see a small area of ocean. We quantified ocean views using these indices.We applied the model to Kuroshio, a tsunami-prone area along the Nankai Trough in Japan and the optimal residential area is calculated for each 500-meter mesh. The results of the sensitivity analysis that changed the weight β (0<β<1) of the safety from tsunami criteria showed trade-offs in which the more safety from tsunami risk is weighted, the more the view of ocean water in the target area is reduced. If weight β is larger than 0.7, ocean views decreases steadily. This is a case study of a specific area and such results are not spatially consistent in all areas. However, similar trade-offs are likely to be obtained in areas with the ocean and mountains in close proximity. This analytical technique is likely to be useful in pre-disaster recovery planning that explores induction-encouraged residential areas that benefit safety from tsunamis and ocean views.

  7. 最適土地利用計画モデルによる集約型土地利用と防災土地利用の両立性の検討

    鬼頭征也, 中居楓子, 大窪和明, 秀島栄三

    土木計画学研究・講演集　67　2023

  8. テラヘルツ波を用いたプラスチックの 素材識別・劣化診断装置

    田邉 匡生 , 大橋 隆宏 , 蘆澤 雄亮 , 劉 庭秀 , 眞子 岳 , 大窪 和明 , 佐々木 哲朗

    月刊 JETI　2022　(11)　29-30　2022/11

  9. 複数の水害シナリオに対するロバスト最適化による土地利用計画の検討

    大窪和明, 中居楓子

    土木計画学研究・講演集　66　2022

  10. 海との視覚的つながりを考慮した最適居住地配置モデル分析

    内生蔵達也, 中居楓子, 大窪和明, 秀島栄三

    土木計画学研究・講演集　66　2022

  11. 廃プラスチックの選別装置開発によるリサイクルの高度化 Invited

    田邉匡生, 大橋隆宏, 劉 庭秀, 眞子 岳, 大窪和明, 佐々木 哲朗

    化学工業　73　(8)　481-486　2022

  12. 津波リスクと平常時の費用を考慮した最適土地利用モデルによるトレードオフの分析

    内生蔵達也, 中居楓子, 大窪和明

    第63回土木計画学研究発表会・講演集　63　2021

  13. Comparative assessment of carbon emissions and cost-effective of auto-bumper recycling method

    Jin H., Yu, Okubo, K

    廃棄物資源循環学会研究発表会講演集　31　2020

  14. A comprehensive life cycle assessment on EV’s lithium-ion battery in China

    Wang, S, Yu, J, Okubo, K

    廃棄物資源循環学会研究発表会講演集　31　2020

  15. Challenges faced by teachers through education for the SDGs -Consideration for emerging issues on waste management and recycling-

    31　2020

  16. 古紙回収量変化の要因分析

    劉暁玥, 劉庭秀, 大窪和明, 佐藤正弘, 青木俊明

    廃棄物資源循環学会研究発表会講演集　31　2020

  17. 社会インフラの劣化異常度を考慮した最適維持管理計画モデル

    大窪和明

    第60回土木計画学研究発表会・講演集　60　2019

  18. Limits and Potential of Second-hand Automobile Parts in Japanese Market

    Hao Jin, Shouyao Wang, Kazuaki Okubo, Jeongsoo Yu

    廃棄物資源循環学会研究発表会講演集　30　2019

  19. Estimation Model of End-of-Life Next-Generation Vehicle: Focusing on Hybrid Vehicle in Japan

    Shouyao Wang, Jeongsoo Yu, Kazuaki Okubo, Hao Jin

    廃棄物資源循環学会研究発表会講演集　30　2019

  20. 自治体における環境啓発キャラクターがごみ減量への影響効果に関する研究

    張雨家, 大窪和明, 劉庭秀

    廃棄物資源循環学会研究発表会講演集　30　2019

  21. 回収ルートの違いが小型家電リサイクル制度に与える影響－使用済み携帯電話を事例に－

    劉暁玥, 大窪和明, 劉庭秀, 王爍堯

    廃棄物資源循環学会研究発表会講演集　30　2019

  22. 教育現場における新しい環境教育の試みとその課題－廃棄物教育の実践例をもとに

    小山内詩織, 劉庭秀, 大窪和明

    廃棄物資源循環学会研究発表会講演集　30　2019

  23. 混合マルコフ劣化ハザードモデルを用いた最適点検間隔の検討

    大窪和明, 全邦釘

    第58回土木計画学研究発表会・講演集　58　2018

  24. 検出力を考慮した最適分類木の提案と適用

    大窪和明, 全邦釘

    第57回土木計画学研究発表会・講演集　57　2018

  25. 地域アセットマネジメントにおける簡易点検手法の適用に関する一考察

    大窪和明, 全邦釘, 浅本普吾, 岡崎慎一郎

    第1回JAAM研究発表会論文集　1　117-122　2017

  26. 経年劣化の不確実性に対するロバスト最適補修計画モデル

    大窪和明, 全邦釘

    第56回土木計画学研究発表会・講演集　56　2017

  27. 災害時における緊急支援物資の最適配分モデルの提案と適用

    大窪和明, 伊坂早織

    第56回土木計画学研究発表会・講演集　56　2017

  28. ペットボトルリサイクルの入札における効率的資源配分

    大窪和明, 矢ヶ崎美香

    第55回土木計画学研究発表会・講演集　55　2017

  29. 橋梁の劣化過程の地域性の解明と地域アセットマネジメント手法の提案

    全邦釘, 大窪和明, 浅本晋吾, 岡崎慎一郎

    第55回土木計画学研究発表会・講演集　55　2017

  30. 部分係数設計法における自動車荷重へのGEVモデルの適用と設計値の設定方法

    大窪和明, 稲見亮汰, 奥井義昭

    土木学会年次学術講演会講演概要集 2017　2017

  31. 地方バス路線における路線最適化モデル

    丹羽拓也, 大窪和明, 坂本邦宏, 谷島賢, 久保田尚

    第54回土木計画学研究発表会・講演集　54　2017

  32. 都市間交通サンプル調査における鉄道サンプルの拡大方法

    山口裕通, 奥村誠, 大窪和明

    43　2011/05

  33. MCMCを活用した企業組織立地モデルによる地域格差分析

    奥村誠, 高田直樹, 大窪和明

    土木計画学研究・講演集　41　2010

  34. 高齢者の情報集約機能に関する社会的ネットワーク分析

    大窪和明, 奥村誠

    第41回土木計画学研究発表会・講演集　41　2010

  35. 社会的学習モデルにおける情報伝達構造の理論的性質の解明

    大窪和明, 奥村誠

    土木計画学研究発表会・講演集　42　2010

  36. The Role of The Elderly Generation for Information Aggregation in Social Network

    大窪和明, 奥村誠

    土木計画学研究・講演集　41　2010

  37. An Analysis of the Closed-Loop Facility Location, Considering the Variability of Used Products

    Kazuaki OKUBO, Makoto OKUMURA

    Infrastructure Planning Review　27　(1)　193-200　2010

  38. Exploring Information Transmission Structure in Social Learning Model

    Kazuaki OKUBO, Makoto OKUMURA

    土木計画学研究・講演集　42　2010

  39. EFFECT OF THE INTER-FIRM FACILITY SHARING ON RESOURCE CIRCULATION

    K. Okubo, M. Okumura, S. Taira

    TRANSPORTATION AND URBAN SUSTAINABILITY　15　605-611　2010

  40. 廃棄物リサイクル財市場における動的価格均衡と問屋の在庫行動

    大窪和明, 稲村肇

    土木計画学研究・講演集　39　2009

  41. Qualitative Zone Classification Based on Transportaiton Activities

    Makoto Okumura, Kazuaki OKUBO, Carlos Nava Fonseca

    Proceedings of the IGU/LUCC North East Asia Conference　2009

  42. 動脈/静脈物流統合型施設配置のモデル分析

    大窪和明, 奥村誠

    土木計画学研究・講演集　40　2009

  43. 最適耐震化混合整数計画問題の拡張-通行可能時間制約の表現-

    佐々木和寛, 奥村誠, 大窪和明

    土木計画学研究・講演集　40　2009

  44. 廃棄物リサイクル財市場における動的価格均衡と問屋の在庫行動

    大窪和明, 稲村肇

    土木計画学研究・講演集　39　2009

  45. Qualitative Zone Classification Based on Transportaiton Activities

    Makoto Okumura, Kazuaki OKUBO, Carlos Nava Fonseca

    Proceedings of the IGU/LUCC North East Asia Conference　2009

  46. 動脈/静脈物流統合型施設配置のモデル分析

    大窪和明, 奥村誠

    土木計画学研究・講演集　40　2009

  47. 最適耐震化混合整数計画問題の拡張-通行可能時間制約の表現-

    佐々木和寛, 奥村誠, 大窪和明

    土木計画学研究・講演集　40　2009

Show all ︎Show first 5

Presentations 16

  1. Developing An Algorithm to Identify Transparent Plastic Materials for Food Containers and Packaging Waste by Using Imagery and Spectroscopy Data

    2025

  2. テラヘルツ波を用いたプラスチック素材識別のための機械学習モデルの開発

    大窪和明, 眞子岳, 劉庭秀, 田邉匡生

    第15回 廃棄物資源循環学会東北支部　2024

  3. 二段階確率計画法を用いた防災土地利用計画の検討

    大窪和明, 中居楓子

    第70回土木計画学研究発表会・秋大会　2024

  4. Analysing trade-offs and synergies in land use for flood resilience and compactness

    2024

  5. 複数の洪水シナリオとコンパクト性を考慮した最適土地利用計画およびトレードオフ構造の検討

    鬼頭征也, 中居楓子, 大窪和明, 秀島栄三

    令和4年度土木学会中部支部研究発表会　2023

  6. 最適土地利用計画モデルによる集約型土地利用と防災土地利用の両立性の検討

    鬼頭征也, 中居楓子, 大窪和明, 秀島栄三

    第67回土木計画学研究発表会・春大会　2023

  7. 海との視覚的つながりを考慮した最適居住地配置モデル分析

    内生蔵達也, 中居楓子, 大窪和明, 秀島栄三

    2022

  8. 複数の水害シナリオに対するロバスト最適化による土地利用計画の検討

    大窪和明,中居楓子

    第66回土木計画学研究発表会　2022

  9. 高齢者の情報集約機能に関する社会的ネットワーク分析

    第４１回土木計画学研究発表会　2010

  10. 社会的学習モデルにおける情報伝達構造の理論的性質の解明

    第４２回土木計画学研究発表会　2010

  11. 財の異質性とリサイクル企業の立地分析

    応用地域学会・名古屋大会　2010

  12. Effect of The Inter-firm Sharing on Resource Circulation

    The 15th International Conference of Hong Kong Society for Transportation Studies　2010

  13. 高齢者の情報集約機能に関する社会的ネットワーク分析

    第４１回土木計画学研究発表会　2010

  14. 社会的学習モデルにおける情報伝達構造の理論的性質の解明

    第４２回土木計画学研究発表会　2010

  15. 財の異質性とリサイクル企業の立地分析

    応用地域学会・名古屋大会　2010

  16. Effect of The Inter-firm Sharing on Resource Circulation

    The 15th International Conference of Hong Kong Society for Transportation Studies　2010

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Research Projects 15

  1. A two-stage distributionally robust optimization approach to pre-disaster recovery planning under population decline

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2025/04 - 2028/03

  2. テラヘルツ技術が拓く海洋新産業と環境改善

    Offer Organization: マリンインフォマティクス研究機構

    System: 地方大学・地域産業創生交付金

    2025/04 - 2028/03

  3. 被災者の異質性によって生じる社会的不平等を考慮した都市復興計画デザイン手法の開発

    中居 楓子, 大窪 和明

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 名古屋工業大学

    2024/04 - 2027/03

  4. 資源循環を取り巻く国際環境の変化が日本の廃プラスチック取引に与える影響

    Offer Organization: 公益財団法人大林財団

    System: 研究助成

    2025/04 - 2026/03

  5. 廃プラスチックの外見的特徴がテラヘルツ分光特性に与える影響と新しい素材識別システムの提索

    劉庭秀, 田邊匡生, 眞子岳

    Offer Organization: 公益財団法人 フジシール財団

    System: 2025年度パ ッケージ研究助成金

    2025/04 - 2026/03

  6. データ駆動型ロバスト最適化による次世代の復興土地利用計画に関する研究

    大窪 和明, 中居 楓子

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2022/04 - 2025/03

  7. 廃プラスチックのビッグデータ分析による識別モデルの構築と評価手法の確立 Competitive

    Offer Organization: CASIO SCIENCE PROMOTION FOUNDATION

    2022/12 - 2023/11

  8. Reconstruction of Sustainability in Nomad through the Clarification of Energy and Environmental Issues;A Method for Utilization of Hybrid-Electric Vehicle

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    Institution: Tohoku University

    2019/10 - 2023/03

  9. Developing a Robust Optimal Maintenance Planning Model Considering the Inspected Information

    Okubo Kazuaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2018/04/01 - 2021/03/31

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    Periodic inspections of social infrastructures are mandatory and a large amount of inspection information has been accumulated. We developed a robust optimal maintenance planning model that takes into account the inspected information. We provide a robust optimal solution to the prediction error in the deterioration rate during the planning period and proposed a maintenance planning model to determine the timing of repair so that the cost is minimized. As a result, it was confirmed that the proposed method can provide a robust plan and revealed that increasing the number of inspections can reduce the cost. In addition, an empirical analysis was conducted to grasp deterioration factors of social infrastructures based on actual inspection reports, for example, the inspection intervals from the viewpoint of expected life cycle costs were discussed.

  10. Analyzing market structure and mechanism design in reverse logistics

    OKUBO Kazuaki, OTAZAWA Toshimori

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Saitama University

    2014/04/01 - 2017/03/31

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    A large amount of used products is recycled by municipalities and recyclers in Japan. Municipality collects and delivers used products to a contracted recycler. Contracts are awarded to recyclers who submit the highest bid for the used products at auction. This study analyzes the used products auctions. First, we estimated the effect of spatial distances between municipalities and recyclers to the valuation of recyclers in the polyethylene terephthalate (PET) bottle auctions by applying structural estimation. Second, we developed models to examine the effect of changes in auction format and introduction of conditional subsidy on the auction with asymmetric recyclers. Third, we examined an efficient resource allocation to maximize Japanese municipalities’ revenues from PET bottle recycling auctions and the potential revenue of municipalities by formulating mixed integer programming model.

  11. Sustainable intercity transportation network planning under decreasing trend of population

    Okumura Makoto

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2013/04/01 - 2017/03/31

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    In Japan inter-city travel demand tends to reduce, then, only a few transportation service can sustain by gathering enough number of passengers in near future. In many OD pairs, passengers must find a longer route using the few sustained transport services, sometimes in different modes. In order to provide usable routes to passengers of many OD pairs, we must investigate efficient network structure and corresponding traffic flows. This project includes (1) destination and modal choice behavior analysis using GNL model permitting heterogeneous structure of elasticity among, (2) travel frequency distribution analysis considering age, generation and regional differences, which enable to assess the effect of service level changes, (3) optimal network structures for different performance criteria, and (4) proposal of optimal network planning model with endogenized demand.

  12. Usage of large scale positioning data for disaster area support

    OKUMURA Makoto, OKUBO Kazuaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2012/04/01 - 2015/03/31

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    When a city is hit by a huge disaster, activities and functions of the city necessary for people are lost and damaged. Total loss of the disaster is not only determined by the direct damage but also by recovering speed. The aim of this analysis is to extract spatio-temporal patterns in a city during a disaster recovery process based on aggregated positioning data of mobile phones. In this analysis, we classified activities and functions decreased through spatial patterns of population distribution during a disaster recovery process through a factor analysis, and confirmed difference in recovering speed. Moreover, we suggested that each spatial pattern is related to the spatial pattern in normal time.

  13. A study on recycling model based on robust optimization

    OKUBO Kazuaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (B)

    2012/04/01 - 2014/03/31

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    The recycling industries face significant uncertainty in quantity of collected used products. Some studies point out variation of collection amount and such uncertainties create disincentives for recycling. We propose a recycler model of small size home electrical appliance with uncertainty in the amount of collection and examine the performance of robust optimzation. We confirmed that applying robust optimization increases average profit of recycler. Next, we focused on the possibility that a recycler with more advanced technology will be less likely to be assigned a contract in auction, because their bid will reflect its high fixed cost. We propose an auction model and showed that if a recycler has advanced technology with high fixed cost they will be less likely to be assigned a contract. We proposed a new mechanism based on robust optimization and showed that the proposed mechanism increases the possibility that a recycler with advanced technology will be assigned a contract.

  14. Methodological study on inter-city transportation analysis for nation-wide transportation management

    OKUMURA Makoto, TSUKAI Makoto, KANEKO Yuichiro, HIBINO Naohiko, OKUBO Kazuaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2009 - 2012

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    This research project summarized the survey and behavior analysis methodologies, considering important characteristics of inter-city passenger transportation, such as, scarce trip generation, imperfect user knowledge, complement or competitive relations on network. We proposed a revision method on biased sample data, a data fusion method using different data sources. Hierarchical structure of business firms were also analyzed in order to understand negative effect of transportation improvement on local economy, sometimes called as “straw absorbing effect."

  15. A study on recycling firm in a sound material-cycle society

    OKUBO Kazuaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Tohoku University

    2010 - 2011

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    This paper analyzes the effect of the fluctuations of the amount of used products, recycling technology improvement and the environmental regulation to the facility location. We found that when the variation of used products is large, they become reluctant to locate a recycling facility. We also found that too strict environmental regulation lead to decrease production in domestic regions. We show that the reduction of the variation of used product is effective for the promotion of recycling. Furthermore we examine the response of collection systems to fluctuations in demand and exogenous collection amount. We reveal that the market collection system can achieve greater and more stable amount of collection, when the collection of used product become more lower because of effort of collector.

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