Control-Theoretic Cyber Physical System Modeling and Synthesis: A Case Study of an Active Direct Methanol Fuel Cell

Naehyuck Chang
Seoul National University

Thursday, February 25, 2010 at 4:00pm
Engr IV Maxwell Room 57-124

Abstract
Cyber Physical System (CPS) modeling and synthesis may have significant discrepancy between theory and practice due to limitation in physical and cyber system interface. In terms of control theoretic pointhave limited bandwidth, response time, accuracy and nonlinearity, and so forth. In this talk, we introduce a case study of a CPS system modeling and synthesis of an active direct methanol fuel cell (DMFC) and a rechargeable battery hybrid. Active DMFC systems are superior especially in fuel efficiency than passive DMFC systems, but a small-scale active DMFC may suffer from significant power consumption from balance of plant (BOP) including pumps, air blowers, fans, etc Powerful BOP may increase the DMFC stack efficiency, but result in negative overall power efficiency because the BOP is also powered by the DMFC stack. The best overall system efficiency is hardly achievable without a systematic modeling and synthesis approach. We introduce i) BOP characterization, ii) integrated DMFC system modeling, iii) efficiency optimal system configuration from design space exploration, iv) synthesis of feedback control tasks, and v) implementation case study.

Biography
Naehyuck Chang is a Professor in Dept. of Electrical Engineering and Computer Science. His research interest includes low-power and embedded systems, and he has published more than 70 technical papers in this area. He serves (and served) as Technical Program Committee EDA conferences such DAC, ICCAD, ISLPED, DATE, CODES+ISSS, ASP-DAC, GLSVLSI and so on. He was a TPC chair of RTCSA 2007, ISLPED 2009 and ESTIMedia 2009. He is General Vice-Chair of ISLPED 2010 and TPC chair of ESTIMedia 2010. He is an Associate Editor of IEEE TCAD since 2006, and Associate Editor of ACM TODAES since 2010. He is a Guest Editor of ACM TECS and ACM TODAES for realtime multimedia systems and low power systems, respectively, in 2010. He served as the Chair of ACM SIGDA Low-Power Technical Committee for 2008 and 2009. He is currently ASP-DAC SIGDA Representative and ACM SIGDA Executive Committee Member (Technical Activity Chair). He is a Senior Member of ACM and a Senior Member of IEEE.