High heterogeneity is an unignoring factor for large-scale peer-to-peer system which leads to the born of VChord. VChord is a peer-to-peer overlay network constructed on Chord aimed to exploit heterogeneity. The fundamental idea of VChord is to expand the use of virtual nodes of Chord to describe the heterogeneity of the real nodes' capability, working with its special lookup algorithm and load transfer scheme to make full use of information of the virtual nodes. The simulation shows that VChord has achieved better routing efficiency and load distribution than standard Chord protocol.

The nearest goal of ShanghaiGrid is to going to connect all supercomputers in this metropolis together to form a sharing environment for massive storage and grid computing. The first stage projects of ShanghaiGrid comprise four sub-projects, including 1) research on environment, protocols and standards of information gird infrastructure; 2) development of system software for information grid and establishment of four major grid nodes; 3) development of peer-to-peer based virtual research platform; 4) research on the application of grid based traffic-jam control and guidance. This paper introduces the background of ShanghaiGrid, provides a glimpse at features and challenges of its sub-projects, and summarizes the general goal of them.

The goal of ShanghaiGrid is providing information services to the people. It aims at constructing a metropolitan-area information service infrastructure and establishing an open standard for widespread upper-layer applications from both communities and the government. A typical application named as Traffic Information Grid is discussed in detail.

Trust model is an important component of gird security model and can be classified as mission-unaware identity trust model, mission-aware identitytrust model, mission-unaware behavior trust model and mission-aware behavior trust model. All of them could be regarded as projections of missionaware behavior trust model, by which authorization depends on not only the trust but also the cost and quantity of the mission. This paper proposes a formal description of this trust model by using abstract state machine (ASM). It will facilitate us understanding its semantics and accurate definitions, and bridging the gaps between de facto industry standards and this trust model. These formalizations are vertical refinements of the ASM based ground model for grids and could be easily jointed on it.

In this paper, we challenge the issue of resource management and scheduling in the grid context, which is compliant with WS-Resource Framework. Firstly, we focus on the high performance application, and model the large-scale scientific computing problem that can be decomposed into multiple sub-problems, which evolves to be represented by a DAG. Then, a hierarchical infrastructure for resource management in the grid context is proposed in accordance with the specifications of WS-Resource Framework. Thirdly, we discuss the scheduling issue in the presented scenario and present a modification of the DLS algorithm. At last we analyze the presented modified algorithm with simulation experiments.