Department of Nuclear Engineering and Management FUJII-KOMIYAMA Laboratory     Graduate School of Engineering                                            University of Tokyo 本文へジャンプ

 Name: Yasumasa FUJII

Professor, Department of Nuclear Engineering and Management

He graduated from the University of Tokyo in 1988. He received his master's degree and doctorate in Electrical Engineering from the same university in 1990 and 1993 respectively. He worked for Yokohama National University from 1993 to 1999. In April 1999, he joined the faculty of the University of Tokyo. He was an Associate Professor in the department of Electrical Engineering from April 1999 to March 2005, and in the department of Advanced Energy from April 2005 to March 2008. He is currently a Professor of the department of Nuclear Engineering and Management. He joined the Environmentally Compatible Energy Strategies Project at International Institute for Applied Systems Analysis (IIASA) in Austria, as an invited research scholar from May 1995 to April 1996.

 His scientific interests:
Assessment and Analysis of Energy Systems, Large-scale Optimization, Stochastic Dynamic Programming, Evaluation of Institutional Design of Electricity Markets

 Selected Papers and Books:

Keigo Akimoto, Toshimasa Tomoda, Yasumasa Fujii and Kenji Yamaji, "Assessment of global warming mitigation options with integrated assessment model DNE21", Energy Economics Vol. 26, Issue 4, EMF 19 Alternative technology strategies for climate change policy, pp. 635-653, July(2004)

T. Shimomura, Y. Saisho, Y. Fujii, & K. Yamaji, "Analysis of the Pricing Process in Electricity Market using Multi-Agent Model", Transaction of Institute of Electrical Engineers JAPAN, Vol.B124, No.2, pp.281-290 (2004) (in Japanese)

Y. Saisho, T. Hayashi, Y. Fujii, & K. Yamaji, "Evaluation of Electric Power Procurement Strategies by Stochastic Dynamic Programming",Transaction of Institute of Electrical Engineers JAPAN, Vol. B125, No. 3, pp.259-267 (2005) (in Japanese)

Yasumasa Fujii and Yoichi Kaya, "Energy", Iwanami Shoten, Iwanami Book Series - Fundamentals of Modern Engineering- Technology Section 5 (2001)

Yasumasa FUJII, "New Energy Supply Technologies", Corona Publishing CO., LTD, Book Series of Technologies and Mechanisms for Global Environment-6, Technology Development for Energy and Environment, Edited by Yuzuru Matsuoka, Chapter 4 (2005)

 Membership of Academic Institutions: 

Institute of Electrical Engineers of Japan, Institute of Electrical and Electronics Engineers, Society of Instrument and Control Engineers of Japan, Japan Society of Energy and Resources

 Name: Ryoichi KOMIYAMA

Department of Nuclear Engineering and Management
Department of Systems Innovation

Employment Record
2022- Professor, The University of Tokyo
2013-2022 Associate Professor, The University of Tokyo
2010-2013 Assistant Professor, The University of Tokyo
2010-Present Visiting Researcher, The Institute of Energy Economics, Japan (IEEJ)
2011-2012 Visiting Research Scholar, University of California at Berkeley (UCB)
2010-2010 Senior Researcher, The Institute of Energy Economics, Japan (IEEJ)
2009-2010 Researcher, The Institute of Energy Economics, Japan (IEEJ)
2007-2009 Visiting Research Scholar, Lawrence Berkeley National Laboratory (LBNL)
2003-2007 Researcher, The Institute of Energy Economics, Japan (IEEJ)

2015 (on-going) , Committee Member for Mediation and Arbitration in Electricity and Gas Market Surveillance Commission, Ministry of Economy, Trade and Industry, Japan
2015-2016, Appointment as Adjunct Lecturer, Akita International University, Japan
2012, 2014, 2016, Appointment as Adjunct Lecturer, Yokohama National University, Japan
2001-2007, Appointment as Adjunct Lecturer, Aeronautical Safety College, Japan

Membership on Governmental Working Groups
2017 (on-going), Committee Member, Electricity Market Rule Examination Committee, Ministry of Economy Trade and Industry, Japan
2017 (on-going), Committee Member, Capacity Mechanism Exploratory Committee, Organization for Cross-regional Coordination of Transmission Operators, Japan
2016 (on-going), Committee Member, Global Environment Sub-committee, Resource and Energy Working Group, Ministry of Economy Trade and Industry, Japan
2016 (on-going), Committee Member, Electricity Transmission Tariff Exploratory Committee, Ministry of Economy Trade and Industry, Japan

Key Qualifications
Key Qualifications
Dr. Komiyama joined the University of Tokyo, Department of Nuclear Engineering and Management, as an assistant professor in 2010. He is originally from the Institute of Energy Economics, Japan (IEEJ), where he conducted the development of energy-economics model based on econometrics and mathematical optimization, and the evaluation of long-term global energy demand and supply projection. He had also served as a member of formulating governmental energy projection under the supervision of Ministry of Economy, Trade and Industry (METI). He obtained a Bachelor in 1998, Master in 2000 and a Ph.D. degree in 2003, all in the field of electrical engineering from The University of Tokyo (UT). His fields of research are energy demand and supply projection in world and Asia, energy security and global change issue, and end-use energy system.

 Selected Papers:

Gyanwali, K., Bhattarai, A., Bajracharya, TR., Komiyama, R. and Fujii, Y, Assessing green energy growth in Nepal with a hydropower-hydrogen integrated power grid model, International Journal of Hydrogen Energy, 47(34), 15133-15148 (2022)

Gyanwali K.,Komiyama R., Fujii Y: Deep decarbonization of integrated power grid of eastern South Asia considering hydrogen and CCS technology, International Journal of Greenhouse Gas Control, Vol.112, December 2021, 103515 (2021)

Yi Y., Gyanwali K.,Komiyama R., Fujii Y., Yamaguchi A.: How Will the Capital Cost Influence the Integration of CCS Coal Plants into the Chinese Low-carbon Optimal Power Expansion Plan by 2050?, Journal of Japan Society of Energy and Resources 42 (6), 368-384 (2021)

Sieed, J., Komiyama, R., and Fujii, Y., Dynamic Multi-Sector Energy Economic Analysis to Identify Potential of Nuclear and Renewable Energy Options in Expanding Electricity Sector of Developing Countries: Bangladesh Case Study, Journal of Japan Society of Energy and Resources, 42(5), 295-304 (2021)

Komiyama, R., Fujii, Y. Large-scale integration of offshore wind into the Japanese power grid. Sustain Sci (2021).

Matsuo, Y., Komiyama, R. System LCOE of variable renewable energies: a case study of Japan’s decarbonized power sector in 2050. Sustain Sci (2021).

Sugiyama, M. Fujimori, S. Wada, K. Oshiro, K. Kato, E. Komiyama, R., Kato, Diego, SH, Matsuo, Y. Shiraki, H. Yiyi J.; EMF 35 JMIP study for Japan’s long-term climate and energy policy: scenario designs and key findings. Sustain Sci (2021).

Shiraki H, Sugiyama M, Matsuo Y, Komiyama R, Fujimori S, Kato E, Oshiro K, Silva DH: T The role of renewables in the Japanese power sector: implications from the EMF35 JMIP. Sustain Sci (2021).

Sakamoto S., Nagai Y., Sugiyama M., Fujimori S.,Kato E,,Komiyama R., Matsuo Y., Oshiro K,, Silva DH: Demand-side decarbonization and electrification: EMF 35 JMIP study, Sustain Sci , 2021 (Accepted)

Khem Gyanwali, Ryoichi Komiyama, Yasumasa Fujii; Power sector analysis of the BBIN sub‐region with a spatially disaggregated dynamic power generation mix model, IEEJ Transactions on Electrical and Electronic Engineering, Vol.15, 11, pp. 1641-1654, 2020

Khem Gyanwali, Ryoichi Komiyama, Yasumasa Fujii, Tri Ratna Bajracharya; A review of energy sector in the BBIN sub-region, International Journal of Sustainable Energy, pp.1-27, 2020 , DOI: 10.1080/14786451.2020.1825436

J Sieed, R Komiyama, Y Fujii; Energy Demand Modelling for Developing Economies Using MAED-2 with Sectoral Decomposition: Bangladesh Case Study, Journal of Japan Society of Energy and Resources 41 (5), 149-154, 2020

J Sieed, R Komiyama, Y Fujii; Long-term Projection of Hourly Electricity Demand with Sectoral Decomposition for Developing Economies: Bangladesh Case Study, Journal of Japan Society of Energy and Resources 41 (4), 136-142, 2020

Gyanwali, K., Komiyama, R., and Fujii, Y. Representing hydropower in the dynamic power sector model and assessing clean energy deployment in the power generation mix of Nepal, Energy, 202, 117795 (2020)

Komiyama, R. and Fujii, Y.; Optimal Integration Assessment of Solar PV in Japan's Electric Power Grid, Renewable Energy, Volume 139, August 2019, Pages 1012-1028, 2019. (doi:

Matsuo, Y. Endo, S. Nagatomi, Y. Shibata, Y. Komiyama, R. Fujii, Y..; A quantitative analysis of Japan's optimal power generation mix in 2050 and the role of CO2-free hydrogen. Energy, Vol.165, pp. 1200-1219, 2018.(doi:10.1016/

Yasuaki Kawakami, Ryoichi Komiyama, Yasumasa Fujii: Penetration of Electric Vehicles toward 2050: Analysis Utilizing an Energy System Model Incorporating High-Temporal-Resolution Power Generation Sector, IFAC-PapersOnLine, Volume 51, Issue 28, Pages 598-603, 2018 (

Komiyama,R. and Fujii,Y., 2017: Assessment of post-Fukushima renewable energy policy in Japan's nation-wide power grid, Energy Policy, Vo.101, February 2017, pp.594-611. [10.1016/j.enpol.2016.11.006]

Komiyama, R. and Fujii, Y., 2016: Optimal Integration of Variable Renewables in Electric Power Systems of Japan, Journal of Energy Engineering, American Society of Civil Engineers, F4016004. [10.1061/(ASCE)EY.1943-7897.0000361]

Komiyama,R. and Fujii,Y., 2015: Long-term scenario analysis of nuclear energy and variable renewables in Japan's power generation mix considering flexible power resources, Energy Policy, Vol.83, pp.169-184, August 2015. [10.1016/j.enpol.2015.04.005]

Komiyama, R. and Fujii, Y., 2015: Energy modeling and analysis for optimal grid integration of large-scale variable renewables using hydrogen storage in Japan, Energy, Vol. 81, 1 March 2015, pp.537–555. [10.1016/]

Komiyama, R. and Fujii, Y., 2015: Modelling Analysis of Electric Vehicle Penetration Scenario using Dynamic Optimal Power Generation Mix Model with High Temporal Resolution, IEEJ Transactions on Power and Energy, in Japanese, Vol. 135-B, No. 1, pp.61-70. [10.1541/ieejpes.135.61]

Komiyama, R. and Fujii, Y., 2015: Assessment of Energy Saving and CO2 Mitigation Potential of Electric Vehicles and Plug-in Hybrid Vehicles under Japan's Power Generation Mix. Electrical Engineering in Japan, Vol.192, No.1, pp.1–12. [10.1002/eej.22546]

Komiyama, R. and Fujii, Y., 2015: Analysis of Japan's Long-Term Energy Outlook Considering Massive Deployment of Variable Renewable Energy under Nuclear Energy Scenario. Electrical Engineering in Japan, Vol.190, No.2, pp.24–40. [10.1002/eej.22503]

Komiyama,R. and Fujii,Y., 2014: Assessment of massive integration of photovoltaic system considering rechargeable battery in Japan with high time-resolution optimal power generation mix model, Energy Policy, Vol. 66, March 2014, pp. 73–89. [10.1016/j.enpol.2013.11.022]

Komiyama, R., Otsuki, T. and Fujii, Y., 2014: Optimal Power Generation Mix considering Hydrogen Storage of Variable Renewable Power Generation, IEEJ Transactions on Power and Energy, in Japanese, Vol. 134-B, No. 10, pp.885-895. [10.1541/ieejpes.134.885]

Komiyama, R. and Fujii, Y., 2014: Assessment of Optimal Power Generation Mix Considering Extensive Variable Renewable Energy and Nationwide Power Interchange through Tie Lines. Electrical Engineering in Japan, Vol.188, No.3, pp.11–21. [10.1002/eej.22576]

Komiyama, R. and Fujii, Y., 2014: Analysis of Energy Saving and Environmental Characteristics of Electric Vehicles in Regionally Disaggregated World Energy Model. Electrical Engineering in Japan, Vol.186, No.4, pp.20–36. [10.1002/eej.22373]

Komiyama, R., Shibata, S., Fujii, Y., 2013: Simulation Analysis for Massive Deployment of Variable Renewables employing an Optimal Power Generation Mix Model, Journal of Energy and Power Engineering, 7, pp.1604-1615.

Komiyama, R. and Fujii, Y., 2013: Assessment of Japan's Optimal Power Generation Mix Considering Massive Deployment of Variable Renewable Power Generation. Electrical Engineering in Japan, Vol.185, No.2, pp.1–11. [10.1002/eej.22470]

Gan, P. Y., Komiyama, R. and Li, Z., 2013: A low carbon society outlook for Malaysia to 2035, Renewable and Sustainable Energy Reviews, Vol.21, pp.432–443. [10.1016/j.rser.2012.12.041]

Komiyama, R., Shibata, S., Nakamura, Y. and Fujii, Y., 2012: Analysis of possible introduction of PV systems considering output power fluctuations and battery technology, employing an optimal power generation mix model, Electrical Engineering in Japan, Vol. 182, No.2, pp.9-19. [10.1002/eej.22329]

Sharma, S., Komiyama, R. and Fujii, Y., 2012: Assessment of Sustainable Energy Strategy with Long Term Global Energy Model Incorporating Nuclear Fuel Cycle, Journal of Environmental Science and Engineering, A1, pp.1215-1232.

Komiyama, R., Li, Z. and Ito, K., 2005: World energy outlook in 2020 focusing on China's energy impacts on the world and Northeast Asia, International Journal of Global Energy Issues, Vol. 24, Nos. 3/4, pp.183-210. [10.1504/IJGEI.2005.007770]

 Selected Books:

Komiyama, R., 2017: Considering Nuclear Accident in Energy Modelling Analysis. In: Resilience: A New Paradigm of Nuclear Safety [Ahn, J., Guarnieri, F., Furuta, K.(eds)]. ISBN 978-3-319-58768-4. Springer, Switzerland, pp.97-110.

Komiyama, R., 2017: Chapter 4: Energy System. In: Introduction for Resilience Engineering: Preparation Toward Unexpected Events, [Furuta, K. (eds)]. Japanese, ISBN-10:4817196246, JUSE Press. Ltd., Japan, pp.67-98.

Fujii,Y. and Komiyama, R., 2014: Chapter 5: Long-Term Energy and Environmental Strategies. In: Reflections on the Fukushima Daiichi Nuclear Accident: Toward Social-Scientific Literacy and Engineering Resilience [Ahn, J., Carson, C., Jensen, M., Juraku, K., Nagasaki, S., Tanaka, S.(eds)]. ISBN 978-3-319-12090-4, Springer, Switzerland, pp.105-115.

Komiyama, R., 2014: Chapter 3 Feasibility of Energy Vision. In: Energy Vision – Global Warming Mitigation Scenario [Yuhara, T. and Ujita, H. (eds)]. Japanese, ISBN9784303562106, Kaibundo, Tokyo, Japan, pp.53-74.

Komiyama, R., 2012: Chapter 5 Japanese Energy Scenario for Large-scale Integration of Solar PV and Wind. In: Green Innovation for the Change of the Japanese Future [Managi, S. and Hayashi. R. (eds)]. Japanese, ISBN-10: 4502461601, Chuokeizai-sha, Inc., Japan, pp.81-103.

Komiyama, R., 2012: Fossil Fuel & Nuclear Energy, Japanese, ISBN-10:4894237695, Bunkeido Co.,Ltd., Japan.

Komiyama, R., 2012: Chapter 1-2 Limitation of Fossil and Nuclear Fuels and the Future. In: Challenge for Low Carbon Society [Japan Society of Energy and Resources (eds)]. Japanese, ISBN-10:4274208192, Ohmsha, Ltd., Japan, pp.25-54.

Yamaji, K. and Komiyama, R., 2011: Chapter 1 Growing Asian Energy and Environment. In: Sustainability (No.5) [Komiyama, H., Sumi, A., Hanaki, K., Takeuchi, K. and Mimura, N. (eds)] .Japanese, ISBN-10: 4130651250, The University of Tokyo Press, pp.7-53.

Ito, K., Li, Z. and Komiyama R., 2008: Chapter 13 Asian Energy Outlook to 2020. In: Asia's New Regionalism and Global Role - Agenda for the East Asia Summit – [Kumar, N., Kesavapany, K. and Chaocheng, Y. (eds)]. ISBN:978-981-230-749-1, Institute of Southeast Asian Studies, Singapore and RIS, pp.221-246.

 Membership of Academic Institutions: 

IAEE(The International Association for Energy Economics), JSER(Japan Society of Energy and Resources), JIE(The Japan Institute of Energy)