Research And Design Of The Grid System Of Secondary School Teaching

The concept of"Grid"is relatively new in the areas of distributed computing and data management. The concept was introduced in 1990's. Grid can be conceived as next generation distributed computing, providing open, standardized platform for computing, services and resources sharing in dynamic environments.In general, a grid system coordinates resources that are not subject to centralized control, using standards, open, general purpose protocols and interfaces to deliver nontrivial qualities of service. These characteristics can be used to evaluate any system classified as a grid system. Grid computing is an infrastructure to harness the idle computing and data resources scattered across the networks. Grid computing, most simply stated is distributed computing taken to the next evolutionary level. The goal is to create the illusion of a simple yet large and powerful self managing virtual computer out of a large collection of connected heterogeneous systems sharing various combinations of resources. Grid systems can be classified into computational grids and data grids. Computational grids involve sharing heterogeneous resources (based on different platforms, hardware/software architectures, and computer languages), located in different places belonging to different administrative domains over a network using open standards. In short, it involves virtualizing computing resources. A data grid is a grid computing system that considers access to distributed data as important as access to distributed computational resources. Many distributed scientific and engineering applications require access to large amounts of data (of the order of terabytes or petabytes). Future applications are envisioned to require widely distributed access to data.Web Services are application propgram module in Internet,which are self-inclusived.Web Services are universal description,discovery and integration(UDDI,for shorted) over the Web. Because the Web is also human socity information infrastructue,all the network computing technologies described above are amalgamation with Web Services.Thus,the last standards for grid computing,named WSRF,are upbuilded over the Web Services.The characteristics of P2P overlay network are investigated deeply with Gnutella...