KEIO RESEARCHERS INFORMATION SYSTEM

Message from the Faculty Member 【 Display / hide 】

Message from the Faculty Member 【 Display / hide 】

• We believe that engineers need to improve their communication skills, problem finding/solving skills, and leadership. By increasing the trust of engineers, excellent products can become more widespread and society can be enriched. the more excellent products will spread and the society will be enriched. In our research activities, we aim to cultivate these skills through uncompromising discussions.

Profile Summary 【 Display / hide 】

Profile Summary 【 Display / hide 】

• This laboratory focuses on performance-based design and optimal design of structures that realize architectural and civil engineering structures with the performance demanded by the users and owners. In order to design the society that has the secure and resilient mechanisms against disasters, the disaster reduction systems and disaster-resistant housing and communities are extensively studied, in which risk evaluation and damage estimation of structures take a leading part.

Career 【 Display / hide 】

Career 【 Display / hide 】

• 1995.04

  -

  1996.03

  Engineer, Architectural and Engineering Design Group, Kajima Corporation

• 1996.04

  -

  1999.03

  Research Engineer, Kajima Technical Research Institute, Kajima Corporation

• 1999.04

  -

  2001.03

  Research Scientist, Earthquake Disaster Mitigation Research Center, Riken

• 2001.04

  -

  2005.03

  Research Associate, Institute of Industrial Science, The University of Tokyo

• 2004.04

  -

  2005.03

  Postdoctoral Fellow of Japan Society of Promotion of Science, and Visiting Associate Professor of Stanford University

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Academic Background 【 Display / hide 】

Academic Background 【 Display / hide 】

• 1993.03

  Kyoto University, Faculty of Engineering, School of Architecture

  University, Graduated

• 1995.03

  Kyoto University, Graduate School of Engineering, Department of Architecture and Architectural Engineering

  Graduate School, Completed, Master's course

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

• Doctor of Informatics, Kyoto University, Dissertation, 2002.03

Licenses and Qualifications 【 Display / hide 】

Licenses and Qualifications 【 Display / hide 】

• first-class registered architect, 1998.02

Research Areas 【 Display / hide 】

Research Areas 【 Display / hide 】

• Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structure engineering and earthquake engineering (Structural Engineering, Earthquake Engineering, Maintenance Management Engineering)

• Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials (Building Construction/Material)

• Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Social systems engineering (Social System Engineering/Safety System)

• Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Safety engineering (Social System Engineering/Safety System)

• Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Disaster prevention engineering (Natural Disaster Science)

Research Keywords 【 Display / hide 】

Research Keywords 【 Display / hide 】

• Earthquake Engineering

• Architectural Structural Engineering

Research Themes 【 Display / hide 】

Research Themes 【 Display / hide 】

• 設備被害を軽減するブロードキャスト対応制震システム, 

  2016

  -

  2019

  　View Summary

  建物内の設備機器と連携して地震時の機能維持を図る，高度な地震対応力を有するアクティブ／セミアクティブ制震システムの実現を目指す。

• Cooperative Control of a Building Structure and Multiple Instruments to Enhance Sustainability of their Functions, 

  2012

  -

  2015

  　View Summary

  本研究は，建物の制振装置と建物内の機器の制振装置を協調的に動作させる効果的な手法の提案を目的とする。建物内に制振装置を持つ複数の機器が導入されたとき，機能維持のための合理的な制御方法を確立するとともに，制御装置間の通信方法を制御性能・信頼性・保守性・保全性などの観点を踏まえ構築することを目指す。

• Autonomous Cooperative Control of a Building-Elevator System Under Long Period Ground Motion, 

  2010

  -

  2012

  　View Summary

  In order to reduce elevator rope damage in a high-rise building due to an earthquake, cooperative control of vibration controllers for a building and elevator rope is studied.

Books 【 Display / hide 】

Books 【 Display / hide 】

• 都市・建築レジリエンスデザイン入門

  小檜山　雅之，ホルヘ・アルマザン，紙田　和代, 慶應義塾大学出版会, 2020.10

• Guidebook of Recommendations for Loads on Buildings

  Architectural Institute of Japan, Architectural Institute of Japan, 2016.02

  Scope: pp. 1-6

  　View Summary

  日本建築学会の2015年版「建築物荷重指針・同解説」を活用し性能設計を行うため、設計の流れや設計例、詳細な解説を記載。１章「性能設計の実現に向けて」の1.1節「目標性能水準設定の基本的な考え方と設計者の役割」の執筆を担当。

• High-Performance Computing for Structural Mechanics and Earthquake/Tsunami Engineering

  Makoto Ohsaki, Tomoshi Miyamura, Masayuki Kohiyama, Takuzo Yamashita, and Hiroshi Akiba, Springer International Publishing, 2015.11

  Scope: Seismic Response Simulation of Building Structures (pp. 105-139)

  　View Summary

  In this chapter, we present an overview of the E-Simulator for application to seismic response analysis of building structures. Accuracy and computational performance of simulation using the E-Simulator are discussed through examples of seismic response analysis of a four-story steel frame, buckling analysis of a column, and simulations of static cyclic responses of a composite beam and an exterior wall. Results of seismic response analysis with fixed base as well as soil-structure interaction analysis are presented for a high-rise building frame. Computational performance using the K computer is also discussed.

• Recommendations for Loads on Buildings (2015)

  Architectural Institute of Japan, Architectural Institute of Japan, 2015.02

  Scope: pp. 95-112

  　View Summary

  日本建築学会による，建築物の構造設計の際に用いる荷重について，基本理念や考え方を示した指針。１章総則の1.2節基本概念と1.3節用語，２章荷重の種類と組合せの2.1節荷重の種類，2.2節荷重の基本値，2.3節荷重の組合せと要求性能の執筆を担当。

• Excelで学ぶ地震リスク評価

  小檜山 雅之, 技報堂出版, 2011.08

  Scope: ４章 フラジリティと損傷度の評価, pp. 39-61

  　View Summary

  日本建築学会荷重運営委員会信頼性工学利用小委員会が，建築工学における確率・統計の利用の普及活動の一環として出版。地震リスク評価について，いくつかの例題をExcel を使って解くことで，ひととおり学べる内容となっている。４章フラジリティと損傷度の評価の執筆を担当。

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Papers 【 Display / hide 】

Papers 【 Display / hide 】

• Damage Classification Method for a Wooden Building Based on Hysteresis Loop Using CNN

  CHIBA Sohki, KOHIYAMA Masayuki, and YAMASHITA Takuzo

  Journal of Japan Association for Earthquake Engineering (Japan Association for Earthquake Engineering)  25 ( 6 ) 74 - 85 2025.05

  Research paper (scientific journal), Accepted,  ISSN  1884-6246

  　View Summary

  The shape of the restoring force–story drift angle relationship curve (hysteresis loop) derived from the seismic response data of a building changes depending on the structural health of the building. In this study, we utilized this characteristic for structural health monitoring and proposed a method to assess the risk of collapse due to future earthquake motions based on hysteresis loop images using a convolutional neural network (CNN). We investigated the impact of axis range and resolution settings in the proposed method, comparing the accuracy and recall of the unsafe model in each case. By adjusting the lower limit for the maximum input acceleration of the seismic wave, we achieved a recall of approximately 90% for the unsafe model. Therefore, it can be concluded that the limit of the maximum input acceleration is one of the most influential parameters in damage classification using CNN.

  • Access to Document (DOI)

• Accuracy Improvement of Damage Classifier for a Wooden Building Considering Pulse-like Seismic Ground Motions

  MIZOBUCHI Rikuto, KOHIYAMA Masayuki, and YAMASHITA Takuzo

  Journal of Japan Association for Earthquake Engineering (Japan Association for Earthquake Engineering)  25 ( 4 ) 97 - 108 2025.03

  Research paper (scientific journal), Accepted,  ISSN  1884-6246

  　View Summary

  Rapid damage assessment by a structural health monitoring system is expected to prevent casualties caused by the collapse of wooden buildings due to repeated seismic motions. While neural networks are known to be a powerful tool for determining the risk of collapse based on the response records, they are not good at classifying untrained damage patterns. This study proposed a method to consider the diversity of damage patterns in the construction of a damage classifier for wooden buildings. This is achieved by using pulse-like simulated ground motions as the input ground motions for seismic response simulation of a target building model in the development of the training dataset. The effectiveness of the proposed method was validated by comparing its accuracy on test data.

  • Access to Document (DOI)

• Damage Classifier for Wooden Buildings Based on Hysteresis Loop Images Using CNN

  Chiba, S., Kohiyama, M., and Yamashita, T.

  Proc. of the 18th World Conference on Earthquake Engineering 2024 (WCEE2024)  2024.06

  Research paper (international conference proceedings), Joint Work, Accepted

  　View Summary

  Structural health monitoring (SHM), which evaluates building damage based on seismic response data, is useful for rapidly assessing damage due to earthquakes. If a reliable damage assessment system for houses can be developed, the loss of human lives caused by the aftershocks of major earthquakes can be reduced. When a target building is damaged by strong seismic ground motions, the shape of the restoring force–story drift angle curve (hysteresis loop) changes. Therefore, based on the hysteresis loop images of wooden buildings, this study proposes a method to classify the risk of collapse because of future seismic ground motions using a convolutional neural network (CNN). To develop training data, structural response analysis is conducted using “wallstat”, which is a numerical analysis software for wooden structures. SHM has more severe consequences when it misclassifies an unsafe condition as safe (miss) than when it misclassifies a safe one as unsafe (false alarm). Therefore, we propose the usage of a dataset that does not contain safe model data near the threshold value of major damage for training to decrease the possibility of misses, and we verify the effect of this. In creating the hysteresis loop images, we examine the range of the axes using two methods: fixing it at specific values and matching it to the range of the minimum and maximum values. The investigation results suggest that the trained CNN learns the changes in structural characteristics, such as stiffness reduction, damping increase, and residual displacement.

• A Warm Standby Based on the Probability to Exceed Damage Threshold for Seismic Response of a Server

  Yusuke KIDA, Enon HIRAOKA, Masayuki KOHIYAMA

  Journal of Social Safety Science (Institute of Social Safety Science)   ( 43 ) 19 - 27 2023.11

  Research paper (scientific journal), Joint Work, Last author, Accepted,  ISSN  1345-2088

  　View Summary

  This study proposes a new warm standby method for computer servers based on seismic response. The proposed method triggers a warm standby in the case that the exceedance probability of the safety limit of seismic response predicted by the last two-second observation record exceeds a preset threshold. Numerical simulations showed that the proposed method reduced the loss cost by 1.64% compared to conventional methods. To validate this method, we conducted shaking table tests. When a simulated earthquake motion was input, the loss cost was reduced by 60.6%. However, when observed records were input, the loss cost was increased by 3.89%. The results suggest that it is necessary improve the input ground motion model.

  • Access to Document (DOI)

• Development of Tool to Enable Autonomous In-Person and Remote Tabletop Exercises by Residents for Developing Next-Generation Leaders for Volcanic Disaster Reduction

  Masayuki KOHIYAMA, Honoka TAKASHIMA, Masayasu YAMAUCHI, Mitsuhiro YOSHIMOTO, Tomohiro KUBO

  Journal of Social Safety Science (Institute of Social Safety Science)   ( 43 ) 315 - 325 2023.11

  Research paper (scientific journal), Joint Work, Lead author, Corresponding author, Accepted,  ISSN  1345-2088

  　View Summary

  To reduce volcanic disasters, it is important for residents to practice mutual support under the leadership of voluntary disaster reduction groups. However, many communities lack the human resource for their future leaders. To address this issue, we proposed a digital tool for residents to develop leaders by themselves. The system requirements were determined to enable residents to conduct autonomous and effective tabletop exercise in both in-person and remote formats. The usefulness of the tool was confirmed through workshops with residents of the areas at the foot of Mt. Fuji.

  • Access to Document (DOI)

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Papers, etc., Registered in KOARA 【 Display / hide 】

Papers, etc., Registered in KOARA 【 Display / hide 】

• Broadcast responsive vibration control system to reduce damage to facilities

  Kohiyama, Masayuki

  科学研究費補助金研究成果報告書 2019

• Cooperative control of a building and equipment to enhance the functional maintainability

  Kohiyama, Masayuki

  科学研究費補助金研究成果報告書 2015

• Structural assesment and evacuation guidance using small robots

  Kohiyama, Masayuki

  科学研究費補助金研究成果報告書 2012

• Autonomous cooperative control of building-elevator system under long period ground motion

  Kohiyama, Masayuki

  科学研究費補助金研究成果報告書 2012

Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• 座談会：震災復興から考えるレジリエントな社会

  菅原 昭彦，福迫 昌之，紙田 和代，小檜山 雅之，厳 網林

  三田評論 (慶應義塾大学出版会)   ( 1253 ) 10 - 26 2021.03

  Article, review, commentary, editorial, etc. (bulletin of university, research institution), Joint Work,  ISSN  1343-618X

• Editorial: Innovative methodologies for resilient buildings and cities

  Takewaki I., Kohiyama M., Trombetti T., Tesfamariam S., Lu X.

  Frontiers in Built Environment (Frontiers in Built Environment)  5 2019.07

  • Access to Document (DOI)

• 細分化された学問と分断された世界をつなぐ

  Masayuki KOHIYAMA

  ACe 建設業界 (一般社団法人日本建設業連合会)  80   26 - 26 2017.12

  Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work,  ISSN  21861862

• 東日本大震災・熊本地震災害の教訓を生かした建築・まちづくり～建物の「社会性」向上に向けて～

  Masayuki KOHIYAMA

  月刊不動産流通 (不動産流通研究所)   ( 419 ) 8 - 9 2017.04

  Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work,  ISSN  0286-388X

• 阪神・淡路大震災20 年シンポジウム「地震被害の軽減に向けた研究者たちのメッセージ―阪神・淡路大震災20 年：地震関連科学の到達点と新たな決意―」開催報告

  Masayuki KOHIYAMA

  JAEE Newsletter (Japan Association for Earthquake Engineering)  4 ( 1 ) 9 - 12 2015.04

  Article, review, commentary, editorial, etc. (scientific journal), Single Work

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Presentations 【 Display / hide 】

Presentations 【 Display / hide 】

• 3次元畳み込みニューラルネットワークを用いた履歴ループに基づく木造建物の損傷判別システム

  千葉荘輝，小檜山雅之，山下拓三

  日本地震工学会・大会－2024 (じゅうろくプラザ（岐阜市文化産業交流センター，岐阜市）) , 

  2024.12

  , 

  Oral presentation (general), Japan Association for Earthquake Engineering

  　View Summary

  The shape of the restoring force–story drift angle relationship curve (hysteresis loop) derived from the seismic response data of a building changes depending on its structural health. Taking advantage of this property, this study proposed a method to assess the risk of collapse due to future earthquake motions based on hysteresis loop images considering the time axis direction using a three-dimensional convolutional neural network (CNN). The effectiveness of the proposed method was verified by comparing the accuracy and recall of the unsafe model between the proposed method and a prior research method using a two-dimensional CNN. It was confirmed that the proposed method adjusting the image size and division number in the time axis direction has a higher accuracy and robustness against observation noise.

• Shaking Table Experiment of a Rigid Body Swing and Horizontal Spring Oscillation Combined Type Tuned Mass Damper Tunable in Two Directions

  SHIMIZU Yuki, KOHIYAMA Masayuki

  Annual Meeting of Architectural Institute of Japan (Surugadai Campus, Meiji University (Chiyoda-ku, Tokyo)) , 

  2024.08

  , 

  Oral presentation (general), Architectural Institute of Japan

• Accuracy Improvement of Damage Classifier for a Wooden Building Based on Acceleration Response Using Long Short-Term Memory

  MAEDA Toshiakira, KOHIYAMA Masayuki, YAMASHITA Takuzo

  Annual Meeting of Architectural Institute of Japan (Surugadai Campus, Meiji University (Chiyoda-ku, Tokyo)) , 

  2024.08

  , 

  Oral presentation (general), Architectural Institute of Japan

• ニューラルネットワークを用いた木造建物の地震被害判別器の学習データセット作成法に関する研究

  溝淵陸大，小檜山雅之，山下拓三

  第16回日本地震工学シンポジウム (パシフィコ横浜ノース4階（神奈川県横浜市西区みなとみらい１丁目１−２）) , 

  2023.11

  , 

  Poster presentation, 日本地震工学会、地域安全学会、地盤工学会、土木学会、日本活断層学会、日本機械学会、日本建築学会、日本災害情報学会、日本災害復興学会、日本地震学会、日本自然災害学会、日本都市計画学会

• 畳み込みニューラルネットワークを用いた履歴ループに基づく木造建物の損傷判別システム

  千葉荘輝，小檜山雅之，山下拓三

  第16回日本地震工学シンポジウム (パシフィコ横浜ノース4階（神奈川県横浜市西区みなとみらい１丁目１−２）) , 

  2023.11

  , 

  Poster presentation, 日本地震工学会、地域安全学会、地盤工学会、土木学会、日本活断層学会、日本機械学会、日本建築学会、日本災害情報学会、日本災害復興学会、日本地震学会、日本自然災害学会、日本都市計画学会

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

Research Projects of Competitive Funds, etc. 【 Display / hide 】

• Resilient Vibration Control Method Considering Functional Continuity and Rapid Restoration

  2020.04

  -

  2024.03

  MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

• Broadcast Responsive Vibration Control System to Reduce Damage to Facilities

  2016.04

  -

  2020.03

  MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

Intellectual Property Rights, etc. 【 Display / hide 】

Intellectual Property Rights, etc. 【 Display / hide 】

• 振動制御システム

  Date applied： 2011-157501  2011.07 

  Date announced： 特開2013-23844   

  Date issued： 5828699  2015.10

  Patent, Joint

• 建物データポリゴン化システム、その方法および建物データポリゴン化プログラム

  Date applied： 特願2001-23850  2001.01 

  Date announced： 特開2002-230589  2002.08 

  Date issued： 3394525  2003.01

  Patent

• フランジ付中間鋼板を使用した積層ゴム支承

  Date applied： 特許出願平9-66319  1997.03 

  Date announced： 特許公開平10-266624  1998.10 

  Patent

Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• SPECIAL LECTURE ON SPACE AND ENVIRONMENT DESIGN ENGINEERING 1

  2025

• SOCIETY, ECONOMY, CULTURE, AND ENGINEERING

  2025

• SEMINAR IN SYSTEM DESIGN ENGINEERING

  2025

• PROBABILITY AND STATISTICS

  2025

• MATHEMATICAL PROGRAMMING FOR DESIGN AND PLANNING

  2025

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Courses Previously Taught 【 Display / hide 】

Courses Previously Taught 【 Display / hide 】

• Probability and Statistics

  Keio University

  2014.04

  -

  2015.03

  , 

  Spring Semester, Lecture

• 社会・経済・文化と工学

  Keio University

  2014.04

  -

  2015.03

  , 

  Autumn Semester

• 設計・計画の最適化数理

  Keio University

  2014.04

  -

  2015.03

  , 

  Autumn Semester, Lecture

• 空間設計製図Ｉ

  Keio University

  2014.04

  -

  2015.03

  , 

  Autumn Semester, Seminar

• 理工学基礎実験

  Keio University

  2014.04

  -

  2015.03

  , 

  Autumn Semester, Laboratory work/practical work/exercise

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Social Activities 【 Display / hide 】

Social Activities 【 Display / hide 】

• Research Fellow

  Institute of Industrial Science, the University of Tokyo

  , 

  2024.04

  -

  2027.03

  　View Summary

  既存不適格建物の耐震改修促進に関する研究

• 国立研究開発法人防災科学技術研究所 数値震動台研究開発分科会 データサイエンスWG 主査

  National Research Institute for Earth Science and Disaster Resilience

  , 

  2020.08

  -

  2023.03

• 国立研究開発法人防災科学技術研究所 数値震動台研究開発分科会委員

  National Research Institute for Earth Science and Disaster Resilience

  , 

  2019.09

  -

  2023.03

• Lecturer of Group Training Course of Seismology and Earthquake Engineering

  International Institute of Seismology and Earthquake Engineering, Building Research Institute,  (Building Research Institute (Tsukuba, Ibaraki))

  , 

  2017.02

  -

  Present

  　View Summary

  Subject: Structural Response Control

• 国立研究開発法人防災科学技術研究所 数値震動台研究開発分科会 建築WG委員

  National Research Institute for Earth Science and Disaster Resilience

  , 

  2016.05

  -

  2023.03

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Memberships in Academic Societies 【 Display / hide 】

Memberships in Academic Societies 【 Display / hide 】

• Japan Society of Civil Engineers

  　

• Earthquake Engineering Research Institute

  　

• Institute of Social Safety Science

  　

• Japan Association for Earthquake Engineering

  　

• Architectural Institute of Japan

  　

Committee Experiences 【 Display / hide 】

Committee Experiences 【 Display / hide 】

• 2025.05

  -

  2027.05

  Auditor of the Board of Directors , Japan Association for Earthquake Engineering

• 2025.04

  -

  2029.03

  Member of Managing Committee on Loads and Actions on Buildings, Architectural Institute of Japan

• 2025.04

  -

  2029.03

  Chair of Subcommittee on Structural Control, Architectural Institute of Japan

• 2025.04

  -

  2027.03

  Chair of Managing Committee on Loads and Actions on Buildings, Architectural Institute of Japan

• 2023.04

  -

  2025.03

  地震保険研究事業評価委員会委員長, 損害保険料率算出機構

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