Prof. Dr.-Ing. Volker Hinrichsen　Technische Universität Darmstadt, Germany
　Prof. Dr.-Ing. Volker Hinrichsen (1954) received both his Dipl.-Ing. and Dr.-Ing. Degrees in Electrical Engineering from Berlin Technical University, where he studied and worked as a Technical Assistant. He joined Siemens Power Transmission and Distribution (Berlin facilities) in 1989 as a test engineer in the high-voltage laboratories. In 1992 he became Director R&D of the Siemens Surge Arrester Division. In this function he was responsible for the full Siemens product range of surge arresters (low-voltage up to 800 kV). In 2001 he joined Technische Universität Darmstadt as a Full Professor in High-Voltage　　　　　　　 Engineering. He is head of the high-voltage laboratories (accredited for dielectric testing up to the 800 kV system voltage level) and active in education, research and testing.

"On Ultra-High Voltage Surge Arresters and Micro-Varistors
　– Progress in Technology and Application of Metal-Oxide Varistors"
　Since metal-oxide (MO) varistors were introduced to the electrical power systems by the end of the 1970s much progress has been made in improving the material and in applying varistors in new applications. Gapless MO surge arresters have completely replaced the former gapped silicon-carbide arrester technology, and due to their simple internal structure they were amongst the very first high-voltage equipment with polymeric 　 housings, introduced in the mid-1980s. Surge arresters have thus always been very modern devices, subject to permanent development, and they have an outstanding service record with failure rates of virtually zero.
　The application of MO surge arresters is essential for ultra-high voltage (UHV) systems of actually up to 1200 kV. These systems can be operated only if arresters of extremely low protection levels and high energy handling capabilities are installed. At the other end of the scale, MO varistor discs, only a few millimeters thick, have been investigated for novel inverter fed drive applications, where they are stressed by thousands of overvoltage events per second. And in an even smaller scale, micro-varistors of 50 to 100 µm diameter can effectively be used for field control in cable accessories and rotating machines, as well as possibly for improved pollution performance of line insulators.
　In this lecture, special aspects of these applications will be addressed and recent findings of related current investigations, e.g. on energy handling capability or on aging performance under high-frequency repetitive stress will be presented.

Dr. C. M. Cooke　　Massachusetts Institute of Technology (MIT)
　Prof. Cooke received his PhD degree from MIT in 1970 and has remained at MIT as both a Lecturer and Principle Research Scientist. Additionally he is a Professor of Electrical Engineering at Suffolk University in Boston. His research activities concerned high voltage insulation (especially GIS systems), sensor and diagnostic technologies (especially for space charges and partial discharges), and charge transport in materials (including electron beam effects). His teaching activities include electronics and circuits courses for undergraduates. Dr. Cooke has worked with many Japanese colleagues at universities and industry and is delighted to be a visitor again today.

"Interfacial Space Charges and Dipoles in Materials and Devoces"
　This presentation will focus on the origin and measurement of interfacial charges. Certain devices, such as batteries, electrets and dipole-layer capacitors benefit from interfacial charges, while other devices such as DRAM memory and high voltage insulation can be degraded by interfacial charges. Charge separation processes at interfaces and charge migration into the material bulk are discussed. One application is the interpretation of ‘absorption’ and ‘desorption’ currents such as encountered with polarization and the Curie-von Schweidler effect. Example results for epoxy insulation are used to illustrate interfacial charge effects on insulators. Special attention is given to dipole charge layers, which usual charge measurements may not detect.

As the connectivity of power grid facilities increases with the adoption of new informa an　communications technologies, there is a growing concern over cyber security of the　Supervisory Control and Data Acquisition (SCADA) Systems. Although the importance of　cyber security for IT is well recognized, research on the integrated cyber-power systems is　just emerging. This seminar will provide the background and vulnerability issues of SCADA　systems. Concepts and techniques for vulnerability assessment will be discussed with　simulation cases. (講演は英語です。English will be used in seminar.)

Chen-Ching Liu served on the PES Governing Board for 6 years (1992-97). He chaired the PES History Committee (1992-98), PES Fellow Committee (2001-02), Technical Committee on Power System Analysis, Computing and Economics (2005-06), and Outstanding Power Engineering Educator Award Committee (2008-Present). He was also active in regional activities. Chen-Ching was Chair, Vice-Chair, Secretary, and Treasurer for PES Seattle Chapter (1984-88) and Chapters Representative for Region 6 North (1992-93). He was Vice Chair of PES Summer Meeting 2000. In 2007-08, Chen-Ching played a leadership role in organizing the NSF Workshop on Future Power Engineering Workforce (co-sponsored by PES, NERC and PSERC) and developing the "PES-Careers" website that is serving many students and companies today. Chen-Ching is currently a Professor and Deputy Principal of College of Engineering, Mathematical and Physical Sciences, University College Dublin (UCD), Ireland. During 1983-2005, he was on the faculty of University of Washington, where he also served as an Associate Dean of Engineering. He was Palmer Chair Professor at Iowa State University (2006-08). Chen-Ching received his BS and MS from National Taiwan University and Ph.D. from University of California, Berkeley. He received a Third Millennium Medal in 2000 and the PES Outstanding Power Engineering Educator Award in 2004.