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Research paper : An optimum design method utilizing a strategic system design concept (J. Fukuda et al.)−195−Synthesiology - English edition Vol.3 No.3 (2010) between the stakeholders with different goals in society, such as the smart grid where the batteries of the electric vehicles parked at home are used as the batteries of the electrical network of the entire society.In the future, we shall investigate using strategic system design for the optimization of more complex systems such as the composite system with three or more stakeholders, by adding solar power generation to the two-stakeholder system of the datacenter and farming.AcknowledgmentsThis research was conducted as a part of the Center for Education and Research of Symbiotic, Safe and Secure System Design, Global COE Program, Keio University. We are thankful to Professor Haruki Sato, Graduate School, Keio University, who provided us with discussions on the use of waste heat.NotesNote 1) 25 % of total national power generation: Projection of energy consumption by IT devices, IT Policy Roadmap, 31P, 2008.6.11 (Strategic Headquarters for the Promotion of an Advanced Information and Telecommunications Network Society)Note 2) Emission coefficient of the power companies: On the publication of the emission coefficients by power companies for FY 2006, 2008.9.27 (Ministry of Environment)Note 3) Temperature difference between Tokyo and Sapporo: Climate statistics information 2008 (Japan Meteorological Agency)Note 4) Capping: Rack air conditioning system, Patent Publication 2009-257730, 2009.11.5 (NTT Facilities, Inc.)Note 5) Heating for greenhouse: Fuel consumption estimate tool for greenhouse heating (prototype Ver.0.90), 2008.2.25 (Advanced Greenhouse Production Research Team, National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization)Note 6) Environment tax rate: Specific plan for environment tax, 2005.10.25 (Ministry of Environment)AuthorsJiro FukudaSenior researcher, Strategic Consulting Room, Mitsubishi Research Institute, Inc. Completed the masters program for mechanical engineering at the Faculty of Science and Engineering, Waseda University. Currently enrolled in the doctorate program at the Graduate School of System Design and Management, Keio University. After joining the Mitsubishi Research Institute in 1989, worked as a consultant for Government and agencies on social systems such as tax system, technological development plan, traffic system, and medical information system. Recently, engaged in consulting for Internet business and Internet datacenter, and supports the activities of the Japan Datacenter Council. In this paper, proposed the strategic system design and conducted simulation estimates.Taketoshi HibiyaAfter working as a senior researcher of Fundamental Research Labs, NEC Corporation, visiting professor of Tokyo Institute of Technology, and professor of Tokyo Metropolitan University, currently working as the professor of the Graduate School of System Design Management, Keio University. Doctor of Engineering. Worked on the development of electronics material, heat property measurements of high-temperature melt, and material process research in zero gravity using rockets and aircrafts. In this paper, considered the composition of datacenter and greenhouse farming from the perspective of system design management.Discussions with Reviewers1 Hierarchy of the systemQuestion (Koh Naito, Center for Service Research, AIST)The terminologies such as “single system”, “supersystem”, “social system”, and “stakeholders” are used. Please explain how each system is related to one another.Answer (Jiro Fukuda)The systems have various levels such as personal, organizational, social, and global levels. They have a hierarchical, stratified structure and influence each other. This paper intends to point out the existence of various stakeholders outside the single system. The effect on the system and the optimal solution under a certain environment on the scale, attribute, and structure of the stakeholders shall be the subjects for future research. In this paper, we explain the optimization in the simplest combination involving two stakeholders and the external environment of environment tax imposition.2 Case of the datacenterQuestion (Akira Yabe, AIST)I think the proposal of the concept of strategic system design and the discussion of the combination of multiple systems from the perspective of physical and value systems is a unique way of thinking. For example, I can think of many applications of this concept such as the combination for using biomass and waste

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