ساخت شبکه فعال محیط زیست در مقیاس بزرگ با همکاری شبکه آموزش الکترونیکی

As a new branch of grid computing, e-Learning grid is emerging as a nationwide e-Learning infrastructure, which can provide innovative learning experience for learners. In such a grid environment, collaboration services will be the key elements due to the pervasive requirement for cooperative work and collaborative learning. Although there exist enormous research efforts on grid-based collaboration technologies, most of them have many limitations. In this paper, with the findings from the computer support cooperative work (CSCW)/computer support collaborative learning (CSCL) and advantages provided by grid, we propose to build grid-enabled large-scale collaboration environment (GLCE). GLCE focuses on distributed, large-scale, and cross-organizational collaboration through creating group-centered next generation collaboration environment, where both intra-group and inter-group collaboration could be supported. With this idea in mind, we present a grid-based cooperative work framework (GCWF), which aims to implement GLCE with an “upper layer” collaboration middleware based on the special-purpose grid infrastructure designed by our team. The preliminary results of our research on GLCE have been applied to build the learning assessment grid (LAGrid). The goal of LAGrid is to support the formative assessment business in China Radio and TV University (CRTVU) and large-scale collaboration within virtual organization (VO) has been realized.

Collaboration technologies are significant for e-Learning grid. In this paper, we argue that GLCE should be the new direction on grid-enabled collaboration technologies. In order to implement GLCE, the framework of GCWF is proposed, which run over collaboration grid infrastructure. LAGrid has been developed as an instance of GLCE, and key middleware of collaboration grid has been developed in LAGrid, including LAGrid–GIS, LAGrid–MOM, LAGrid–Security, LAGrid–SA, etc. Furthermore, high level services, such as awareness service, global task scheduling, etc. have been implemented over these developed middleware. Initial large-scale collaboration environment inside VO has been realized based on these developed services and middleware. LAGrid has been deploying in the nationwide region now. The idea of GLCE and the framework of GCWF will be further validated, and future research in LAGrid will be carried out in two aspects. One is to construct the large-scale collaboration environment into group-level inside VO to realize structure collaboration, which is more significant for the implementation of GCLE described by GCWF. The other is to expand LAGrid with other learning service to support full learning process, such as learning administration, active on-line learning activities, etc., and in this process, the functions of GLCE will be integrated into various learning activities. With these efforts, e-Learning Grid for the national public e-Learning platform will be realized, and advanced collaborative lifelong learning environments can be created.