Research On Resources Cooperative Mechanism Of CSCL Based On Grid

CSCL (Computer Supported Collaborative Learning) is a learning method which makes use of computer technology to assist and support Collaborative Learning (especially the multimedia and network technology). These years, CSCL has become a hot topic in education research, constant development of CSCL demand the learning resource can be shared and reused, and moreover support the interaction of collaborative work and Multi-Pattern. Grid is an important area of research and application of the next generation of Internet. The Grid mainly research on constructing virtual organization dynamically in the distributed, heterogeneous, autonomous environment of network resources and realizing cross-organizational resources sharing and cooperation work, sharing and collaboration is the basic idea of Grid.This paper combines Grid and CSCL, proposes a CSCL resource collaborative model, research on the storage mechanism and resource discovery and scheduling strategies of the model.(1) Research on CSCL Platform Model. Apply the grid in CSCL system, propose a CSCL platform model framework in this paper, the model includes resource layer, grid service layer, the grid middleware layer and application layer.(2) Metadata-based directory information tree resource storage model. In this model, uses metadata describe the resource parameters, to eliminate the heterogeneity of CSCL resources, a unified global organization of directory information tree resources has good scalability and can allocate resources reasonably.(3)Research on combination of P2P and grid resource discovery mechanism. The mechanism has a non-centralized control and easy expansion, eliminate system bottlenecks and locate the resources efficiently.(4) Multi-dimensional QoS scheduling policy design based on Economic model. The strategy takes into account the time, price and reputation of the multi-dimensional QoS, under the precondition of meeting the time and cost constraints, to achieve load balancing and improve resource utilization. For the 200 tasks whose length is 10000, respectively, under the premise of Deadline and Budget use DBC optimal cost algorithm and compared with the algorithm of the algorithm proposed this paper, results show that this algorithm reduces the average completion time of task, balances the load and improve the task completed rate.Resources Cooperative Mechanism of CSCL Based on Grid emphasize the cross-organizational collaboration and sharing of resources, apply Grid in CSCL will bring greater opportunities and development.