K. Ragab is an assistant professor at Department of Computer Science, College of Computer and Information Technology, King Faisal University, Saudi Arabia. Moreover, he is on leave assistant professor of Computer Science at Department of Mathematic, Computer Science division, Ain Shams University. He joined Department of Computer Science, Tokyo University in 2005 as postdoctoral position. He was born in 1968 and received his B.Sc., M.Sc. degrees in Computer Science from Ain Shams University, Cairo, Egypt in 1990, 1999, respectively and Ph.D. degree in Computer Science from Tokyo Institute of Technology in 2004. He has worked in Ain Shams University, Cairo Egypt in 1990-1999 as assistant lecturer. He has worked as research scientist in Computer Science Dept., Technical University of Chemnitz, Germany in 1999-2001. His research interests include autonomous decentralized systems, Peer-to-Peer Systems, video streaming systems, Overlay Networks, Web-services and application-level multicast. Tarek Helmy is currently with the department of Information and Computer Science, College of Computer Science and Engineering at King Fahd University of Petroleum and Minerals (KFUPM). On leave from the College of Engineering, Department of Computers Engineering and Automatic Control, Tanta University, Egypt. He received his Ph.D. in Intelligent Systems from Kyushu University, Japan, in 2002. His research interests include Operating Systems, Multi-Agent Systems, Personalized Web Services, and Cooperative Intelligent Systems. He has published more than 40 papers in major international journals and conferences in the fields of cooperative intelligent agents, artificial intelligence and operating systems. Dr. Helmy is on the program/organizing committee of various international journals/conferences in the fields of artificial intelligence, multi-agents, intelligent and distributed systems. Aboul Ella Hassanien received his B.Sc. with honors in 1986 and M.Sc degree in 1993, both from Ain Shams University, Faculty of Science, Pure Mathematics and Computer Science Department, Cairo, Egypt. On September 1998, he received his doctoral degree from the Department of Computer Science, Graduate School of Science & Engineering, Tokyo Institute of Technology, Japan. Currently, he is an associated Professor at Cairo University, Faculty of Computer and Information, IT Department, Egypt.