and G.M.Masson, “ Strictly nonblocking conference networks using high-Dimensional meshes

Abstract: This paper introduces a conferencing server design based on an innovative configurable computing architecture to support the information transmission and distributed processing associated with creating and maintaining simultaneous disjoint conferences among sets of N conferees, where rdimensional meshes can be used as the conferencing components. An r-dimensional conferencing mesh network is strictly nonblocking if, regardless of the existing conferences implemented, a new conference among any subset of the idle conferees can be implemented using a connected set of idle processing elements without any disturbance to the existing conferences. Using arguments employing the isoperimetric ratios of the sizes of edge and node sets in a graph, we give necessary and sufficient conditions such that an r-dimensional conferencing mesh of M nodes provides strictly nonblocking conferencing to N conferees. We show that a necessary and sufficient condition for r-dimensional meshes to be strictly nonblocking, when dimension r is fixed, is that M Å O(N ( r / 1)/r ). For general r-dimensional meshes, M Å O(r ( r 0 1)/r N ( r / 1)/r ) nodes are sufficient to support strictly nonblocking capabilities. A fundamental relationship is established between the requirements on M for strictly nonblocking conferencing among N conferees using certain graph structures and the isoperimetric ratios for those structures

Security in Distributed, Grid, Mobile, and Pervasive Computing

This book addresses the increasing demand to guarantee privacy, integrity, and availability of resources in networks and distributed systems. It first reviews security issues and challenges in content distribution networks, describes key agreement protocols based on the Diffie-Hellman key exchange and key management protocols for complex distributed systems like the Internet, and discusses securing design patterns for distributed systems. The next section focuses on security in mobile computing and wireless networks. After a section on grid computing security, the book presents an overview of security solutions for pervasive healthcare systems and surveys wireless sensor network security