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.

Resource management system is the core component of a Grid system. It has two important functions: resource publication and discovery. This paper presents an ontology-based model for Grid Resource Publication and Discovery (GRPD). We adopt multiple domainspeci fic registries to manage corresponding resources of a Virtual Organization (VO) in order to obtain high GRPD efficiency. Resource descriptions and resource requests are all based on domain-specific ontology. The ontology-based matchmaker of the domain-specific registry plays the important role in resources selection. The "Index" node of a VO hosts the general registry. Other domain-specific registries are distributed in the VO. This is a two-level registry mechanism. A large-scale Grid system may contain many VOs. "Index" nodes from various VOs connect to each other in the peer-to-peer mode instead of the hierarchical mode.

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.

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.

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.

The growing demand of e-business and development of Grid technologies increasingly drive to integrate heterogeneous Grid resources in uniform way. However, this can not be satisfied by existing ntegration schemes. And at the time of writing, little efforts have been done. This paper1 proposes a Grid service integration architecture, which is based on the Open Grid Services Architecture (OGSA), for addressing how various Gird resources are integrated into a virtual Grid application in the service-oriented approach. The architecture can integrate extremely heterogeneous Grid resources in "Plug and Play" way and provides abilities to handle transaction, workflow and accounting. The agent simplifies use of Grid resources because it shields user from complex process. Moreover, the paper discusses implementation of the architecture.

Routing efficiency is the critical issue when constructing peerto-peer overlay. A peer-to-peer overlay, called HP-Chord, is illustratedin this article which aims to achieve better routing efficiency. HP-Chordis built on the basis of Chord overlay, which makes use of the heterogeneity of the bandwidth of the nodes and exploits the proximity of the underlying network. The simulation shows that HP-Chord has achieved better routing efficiency than standard Chord overlay on two aspects, which are lower number of hops and lower RDP per message routing.

Segmentation is one of the most important and difficult procedures in medical image analysis and in its clinical applications; and blood vessels are especially difficult to segment. In this paper, we propose an isosurface-based level set framework to extract vasculature tree from magnetic resonance angiography (MRA) volumes. First, we process the extracted isosurface of MRA via the surface normal vectors; then use canny edge detection to compute image-based speed function for level set evolution to refine the processed isosurface for the exact segmentation. Results on cases demonstrate it is the mostly accuracy and efficiency of the approach.

Integrating heterogeneous systems in the "plug and play" way is a goal of distributed computing researchers. In this paper1, we propose a general platform to integrate Grid services for enterprise applications, and present implementation mechanisms of its core components. The platform can handle transaction, workflow and security to satisfy enterprise application requirements. Moreover, the platform is fully built on open standards so that it has some good properties such as scalability, adaptability and portability.