Zongfen Han

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—Virtual machine technology can enhance server utilization and consolidation on an individual physical machine. In a growing number of contexts, many of which require high-performance networking inside of the system. Unfortunately, the development of virtualization technology is inclined to application isolation as yet, leads high communication overheads(More)
Resource discovery is a basic service in grid computing : gives a description of resources desired and finds the available one to match the description. In computational grid, how to discover resources efficiently has become a crucial factor to evaluate the performance in the whole system. In this paper, we present a bid-based resource discovery algorithm,(More)
— Workflows are often used to represent enterprise-type activities, and authorisation control is an important security consideration in enterprise-level applications. Role-Based Access Control (RBAC) is a popular authorisation control scheme under which users are assigned to certain roles, and the roles are associated with permissions. This paper presents a(More)