Research Of An Adaptive Distance Education System Based On The Network

Distance education based on the network is a kind of education pattern, whichappears in 1990's. It has such characteristic: The teachers and students separate, rely onthe media carrying on the teaching. It take the computer network technology, thesatellite communication technology as the foundation, it also take the multimediatechnology as the main method. We may expect that distance education based on thenetwork will play the vital role in people's life and the study in the future informationsociety.The main new points of this paper can be summarized, that is:(1) An adaptive e-learning system based on network environment is proposed. As aresult of making the learner become the center of system, the requirements of adaptivelearning are met; As a result of adding application server on network server, theloading ability of the system is improved, and more requirements of learner are met; asa result of adding learner data-base server & learner data-base, the cooperative powerof every sections in the system are improved, the flexibility and adaptability of thesystem are increased.(2) The learning database & the learner database models of an adaptive e-learningsystem are proposed based on the fuzzy sets. Owing to make use of the fuzzy setstheory, this model enables to form the fuzzy graph that is used to describe theknowledge of the network Courses, and it enables to form the fuzzy subgraph that isused to describe the individual learner's knowledge. This system enables to recognizeeach individual learner and describe their knowledge by means of fixing quantifyration, and dynamically provides the navigation of each individual learner. This abilityto adapt to an individual learner's needs can significantly improve the learning processand meet the requirements of individual learning. The results of the test have indicatedthat improving learner's results directly correlative to the learning system.(3) The security distance education management system based on the network isproposed. The application of the cryptography and the digital signature in thismanagement system could satisfy the system well with the request of secure and theauthentication. The proxy digital signature algorithms based on The ElGamalsignature scheme in existence are proposed, and they are mono-proxy digital signaturealgorithm and multi-proxy digital signature.These digital signature algorithms have thestrongpoint of short key, small parameter scale, rapid operation, finer security, andcontrast with the proxy digital signature algorithms based on The Fiat-Shamirsignature scheme and The Guillou-Quisquater signature scheme. (4) The system based on the WAN is compared with that based on the LAN.Depended on the high speed multimedia campus network of Shanxi Normal University,one kind of real-time e-learning system is provided and constructed based on theH.323 protocol standard, its strategy of congestion control have been provided, and itsfeasibility and usability are confirmed through the example.(5) The linear programming theory is applied to present and complete the greatestinformation content model, which is suitable for the adaptive e-testing system based onthe network. The weighted deviations model of the linear programming is applied inthe system to form the test paper, and in order to realize the system, the strategy andthe steps for forming test papers are provided. The relevant coefficient is used toanalyze the quality of the adaptive e-learning test. The model and the method, whichuse the relevant coefficient to carry on the quality analysis of test papers, are provided.And its feasibility and usability are confirmed through the example.(6) The method, which constructs resource database, the user database and thequestion database, is realized. The composition and the technology of the adaptivee-learning system & the adaptive e-testing system based on the network are realized.The system function structure, the working program and essential technology fordeveloping the system are realized. In this foundation, the main contact surface, themain function module and so on about the system are designed and realized.