ABSTRACT : Today’s wireless networks are characterized by a fixed spectrum assignment policy. However, a large portion of the assigned spectrum is used sporadically and geographical variations in the utilization of assigned spectrum ranges from 15% to 85% with a high variance in time. The limited available spectrum and the inefficiency in the spectrum usage necessitate a new communication paradigm to exploit the existing wireless spectrum opportunistically. This new networking paradigm is referred to as cognitive radio networks. In this tutorial, the novel functionalities and current research challenges of the cognitive radio networks are explained in detail. More specifically, a brief overview of the cognitive radio technology is provided and the network architecture is introduced. Moreover, the cognitive network functions such as spectrum management, spectrum mobility and spectrum sharing are explained in detail. The influence of these functions on the performance of the upper layer protocols such as routing and transport are investigated and open research issues in these areas are also outlined.

BIOGRAPHY OF I.F. AKYILDIZ IAN
Prof. Akyildiz is the Ken Byers Distinguished Chair Professor and Director of Broadband and Wireless Networking Laboratory at School of Electrical and Computer Engineering at Georgia Institute of Technology since 20 years.
Professor Akyildiz is Editor-in-Chief of Computer Networks (Elsevier) Journal, and Ad Hoc Networks (Elsevier) journal. Professor Akyildiz is an IEEE Fellow (1995), an ACM Fellow (1996). He received several IEEE and ACM Awards including IEEE Leonard Abraham Best paper award from IEEE JSAC in 1997, IEEE Best Tutorial paper award in 2003, IEEE Harry Goode Memorial Award (IEEE Computer Society), 2003 ACM SIGMOBILE award for his pioneering contributions in mobility and resource management in wireless networks, ACM Best Distinguished Lecturer Award in 1994, Georgia Tech Faculty Research Author Award in 2004 and School of ECE/Georgia Tech Distinguished Faculty Award in 2005.
Prof. Akyildiz guest edited several special issues and organized many leading conferences such as IEEE INFOCOM 1998, IEEE ICC 2003, ACM MOBICOM 1996 and 2002 and many others. His current research interests are Wireless Sensor Networks, Next Generation Wireless Networks and Interplanetary Internet.

ABSTRACT The past few years have witnessed the emergence of Peer-to-Peer (P2P) systems as a means to further facilitate the formation of communities of interest over the Internet in all areas of human life including technical/research, cultural, political, social, entertainment, etc. P2P technologies involve data storage, discovery and retrieval, overlay networks and application-level routing, security and reputation, measurements and management. This tutorial will give an appreciation of the issues and state of the art in Peer-to-Peer Networking. It will introduce the underlying concepts, present existing architectures, highlight the design requirements, discuss the research issues, compare existing approaches, and illustrate the concepts through case studies. The ultimate objective is to provide the tutorial attendees with an in-depth understanding of the issues inherent to the design, deployment and operation of large-scale P2P systems. 

BIOGRAPHY OF Raouf Boutaba
Raouf Boutaba is currently an Associate Professor in the School of Computer Science of the University of Waterloo. Before that he was the Director of the Telecommunications and Distributed Systems Division of the Computer Science Research Institute of Montreal. He held Visiting Professor Positions at the University of Toronto (Canada), the University of Pierre et Marie Curie (France), the University of Versailles (France), POSTECH (Korea), and ENST-Paris (France). Dr. Boutaba has published more than 200 papers in refereed journals and conference proceedings. He is the recipient of the Premier's Research Excellence Award, two NORTEL research excellence Awards and several Best Paper awards. He is a distinguished lecturer of the IEEE Communications Society. He is the Chairman of the IFIP Working Group on Networks and Distributed Systems, the Chair of the IEEE Communications Society Technical Committee on Information Infrastructure and the IEEE Communications Society Technical Sub-Committee on Autonomic Communications, and the Director of the Related Societies Board of the IEEE Communications Society. He is Past Director of the standards board of the IEEE Communications Society, Past Vice Chair of IEEE Communications Society Technical Committee on Information Infrastructure, and served as a distinguished lecturer of the IEEE Computer Society. He is the founder and Editor in Chief of the IEEE Transactions on Network and Service Management, on the advisory editorial board of the Journal of Network and Systems Management, on the editorial board of the KIKS/IEEE Journal of Communications and Networks, and the editorial board of the Journal of Computer Networks. He acted as the program chair for the IFIP Networking conference and the IEEE CCNC conference, and a general or program co-chair for the IEEE/IFIP NOMS, IFIP/IEEE MMNS, IEEE FIW, IEEE ACC, IEEE ICC and Globecom symposia among others. Dr. Boutaba teaches computer networks and distributed systems and conducts research in the area of resource management in wired and wireless networks. 

BIOGRAPHY OF I.F. AKYILDIZ IAN
Prof. Akyildiz is the Ken Byers Distinguished Chair Professor and Director of Broadband and Wireless Networking Laboratory at School of Electrical and Computer Engineering at Georgia Institute of Technology since 20 years.
Professor Akyildiz is Editor-in-Chief of Computer Networks (Elsevier) Journal, and Ad Hoc Networks (Elsevier) journal. Professor Akyildiz is an IEEE Fellow (1995), an ACM Fellow (1996). He received several IEEE and ACM Awards including IEEE Leonard Abraham Best paper award from IEEE JSAC in 1997, IEEE Best Tutorial paper award in 2003, IEEE Harry Goode Memorial Award (IEEE Computer Society), 2003 ACM SIGMOBILE award for his pioneering contributions in mobility and resource management in wireless networks, ACM Best Distinguished Lecturer Award in 1994, Georgia Tech Faculty Research Author Award in 2004 and School of ECE/Georgia Tech Distinguished Faculty Award in 2005.
Prof. Akyildiz guest edited several special issues and organized many leading conferences such as IEEE INFOCOM 1998, IEEE ICC 2003, ACM MOBICOM 1996 and 2002 and many others. His current research interests are Wireless Sensor Networks, Next Generation Wireless Networks and Interplanetary Internet.

ABSTRACT The goal of this talk is to discuss the technical issues that are molding future trends in operating systems. Solaris is one of the widest deployed operating systems in banking, telecommunications and other large enterprises. This talk will cover the features of Solaris that separate it from other operating systems, touch on future trends in processors, High Performance Computing, operating system scaling, developer languages and tools. The needs of the OS will be juxtaposed against the needs for information security. The result of this talk will be a higher understanding where all operating systems are going and why.

BIOGRAPHY OF J. Hugues
James currently is a Sun Fellow and vice president in the Solaris Operating System organization at Sun Microsystems. He has 35 years in the computer industry in the areas of Networking, Storage and Security. In his current role, he is responsible for guiding the future direction for the Solaris operating system. Prior to this position, he was a Fellow at Network Systems Corporation, a fellow at Storage Technology Corporation now Sun, each through acquisition.
James' technical focus includes High Performance Computing, Storage, Networking, Security and Cryptography. James has been a member of several IEEE and ANSI standards organization in the areas of communication, security and storage, and is currently the chair of the IEEE P1619 working group to standardize encrypted storage.

BIOGRAPHY of S. Hariri
Salim Hariri is a Professor in the Department of Electrical and Computer Engineering at The University of Arizona. He received his Ph.D. in computer engineering from University of Southern California in 1986, and an MSc from The Ohio State University in 1982. Dr. Hariri is the Editor-In-Chief for the CLUSTER COMPUTING JOURNAL (Springer, http://www.springer.com/journal/10586). He is the Founder of the IEEE International Symposium on High Performance Distributed Computing (HPDC) and the co-founder of the IEEE International Conference on Autonomic Computing. His current research focuses on autonomic computing, self-protection, self-optimization, self-configuration and self-healing of networked systems and services. Dr. Hariri has developed an innovative Physics Aware Programming (PaP) paradigm and autonomic computing middleware and for large scale Grid Scientific and Engineering applications that was funded by NSF, Intel, Raytheon and DOE. He is co-author/editor of four books on parallel and distributed computing: Autonomic Computing: Concepts, Infrastructure, and Applications (CRC Press, 2007), Tools and Environments for Parallel and Distributed Computing (Wiley, 2004), Virtual Computing: Concept, Design and Evaluation (Kluwer, 2001), and Active Middleware Services (Kluwer, 2000).
For further information, please visit http://www.ece.arizona.edu/~hpdc