Secrecy performance of wireless powered communication network
School of Electrical Engineering, Korea University
In this talk, we first review radio frequency (RF) based wireless power transfer techniques. Then, we examine a multi-user wireless powered communication network (WPCN) with an energy harvesting (EH) jammer. In the presence of an eavesdropper, a hybrid access-point (H-AP) first broadcasts an energy signal to EH users in an energy transmission (ET) phase, while each of them subsequently transmits its individual message to the H-AP in a time division multiple access manner during an information transmission (IT) phase. At the same time, the EH jammer simultaneously generates artificial noises to keep the messages confidential. We propose an efficient time allocation method for ET and IT phases so as to minimize the secrecy outage probability in the absence of the eavesdropper's instantaneous channel state information. Finally, we evaluate the performance of our proposed solutions through simulations.
Inkyu Lee received the B.S. degree (Hons.) in control and instrumentation engineering from Seoul National University, Seoul, South Korea, in 1990, and the M.S. and Ph.D. degrees in electrical engineering from Stanford University, Stanford, CA, USA, in 1992 and 1995, respectively. From 1995 to 2001, he was a Member of Technical Staff with Bell Laboratories, Lucent Technologies, where he studied high-speed wireless system designs. From 2001 to 2002, he was with Agere Systems (formerly Microelectronics Group of Lucent Technologies), Murray Hill, NJ, USA, as a Distinguished Member of Technical Staff. Since 2002, he has been with Korea University, Seoul, where he is currently a Professor with the School of Electrical Engineering. Also he is the head of the BK21 Center for humanware information technology. In 2009, he was a Visiting Professor with the University of Southern California, Los Angeles, CA, USA. He has authored over 140 papers in IEEE journals and has 30 U.S. patents granted or pending. His research interests include digital communications, signal processing, and coding techniques applied for next-generation wireless systems. He has served as an Associate Editor of the IEEE TRANSACTIONS ON COMMUNICATIONS from 2001 to 2011 and the IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS from 2007 to 2011. In addition, he has been a Chief Guest Editor of the IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS (Special Issue on 4G Wireless Systems) in 2006. He was a recipient of the IT Young Engineer Award at the IEEE/IEEK Joint Award in 2006 and of the Best Paper Award at APCC in 2006, IEEE VTC in 2009, and ISPACS in 2013. He was also a recipient of the Best Research Award from the Korea Information and Communications Society in 2011 and the Best Young Engineer Award from the National Academy of Engineering in Korea (NAEK) in 2013. He has been elected as a member of NAEK in 2015. He is an IEEE Fellow and an IEEE distinguished lecturer.
Advanced Electronic and Photonic Materials and Devices for Next-Generation Integrated System
Assistant Professor, Department of Electronics Engineering, Gachon University
Recently, high-speed and low-power capabilities of electronic system are more increasingly required due to the growing demand on mobile electronic appliances and ultra-fast processing units. Although functional materials and devices have been suggested and studied in wide variety for the goal, Si compatibility has been considered as one of the indispensable prerequisites in realizing the technologies, owing to cost-effectiveness and high maturity of Si processing. In this talk, Si-compatible materials, with a particular interest in Group-IV materials, and electronic/photonic devices having implementation feasibility on the platform are demonstrated. Various aspects of the new technologies are addressed covering atomic-level simulation, device design, and circuit-level compact modeling, and system performance prediction by showing theoretical and experimental results. A perspective on the advanced Si integrated system touched by light lies throughout the talk.
2004 B.S., Electrical Engineering, Seoul National University
2010 Ph.D., Electrical Engineering, Seoul National University
2009 Exchange Researcher, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
2010 Postdoctoral Researcher, Department of Electrical Engineering and Computer Science, Seoul National University
2010~2013 Postdoctoral Researcher, Department of Electrical Engineering, Stanford University, CA, USA
2013~ Assistant Professor, Department of Electronics Engineering, Gachon University
Graph signal processing: Recent progress and applications
Tokyo University of Agriculture and Technology / JST PRESTO
Graph signal processing (GSP) is an emerging field of signal and information processing. It aims to analyze, compress, learn, and restore data located on complex (and possibly large-scale) networks. There are many potential applications in sensor networks including IoT, smart grid, biomedical engineering, machine learning, computer vision/graphics, pattern recognition, bioinformatics, and geographic information systems. In this talk, I will first introduce fundamentals of graph signal processing such as graph Fourier transform and filtering on graphs. Then some recent works in GSP in the graph spectral (graph Fourier) domain will be presented, which include wavelet/filter bank design, graph signal denoising, sensor placement in the GSP perspective, and EEG signal classification.
Yuichi Tanaka received the B.E., M.E. and Ph.D. degrees in electrical engineering from Keio University, Yokohama, Japan, in 2003,
2005 and 2007, respectively. He was a Postdoctoral Scholar at Keio University, Yokohama, Japan, from 2007 to 2008, and supported by the Japan Society for the Promotion of Science (JSPS). From 2006 to 2008, he was also a visiting scholar at the University of California, San Diego. From 2008 to 2012, he was an Assistant Professor in the Department of Information Science, Utsunomiya University, Tochigi, Japan. Since 2012, he has been an Associate Professor in Graduate School of BASE, Tokyo University of Agriculture and Technology, Tokyo, Japan. Currently he has a cross appointment as a PRESTO Researcher, Japan Science and Technology Agency. His current research interests are in the field of multidimensional signal processing which includes:
graph signal processing, image and video processing with computer vision techniques, distributed video coding, objective quality metric, and effective spatial-frequency transform design.
Dr. Tanaka has been an Associate Editor of IEEE Transactions on Signal Processing since 2016 and also IEICE Transactions on Fundamentals since 2013. Currently he is an elected member of the APSIPA Image, Video and Multimedia Technical Committee. He was a recipient of the Yasujiro Niwa Outstanding Paper Award in 2010, the TELECOM System Technology Award in 2011, and Ando Incentive Prize for the Study of Electronics in 2015. He also received IEEE Signal Processing Society Japan Best Paper Award in 2016 and Best Paper Awards in APSIPA ASC
2014 and 2015.