| Currently, digital educational resources are growing rapidly at an unprecedented rate. With the constantly emergence and development of educational resource cloud, such as the Basic Education Resource Cloud of the NCET, the Guoshi.com of CETV, the Education Cloud of Tsinghua Tong Fang, are all typical cases, Making that the resource integration based on cloud services, cloud services management and the construction of data center, is becoming a hot issue of the current education informationization development.Educational resources increasingly being used in form of cloud services in the personal learning environment and equipment at the cloud terminal, like the intelligent phone, Pad, e-Schoolbag. At the same time, the massive, dynamic, autonomous, collaborative, and evolving characteristics of educational resource cloud services, is the problem that the application ecology of the education resource services in the cloud environment must face to. The cloud services information being Reasonable and effective described, organized and managed, is the basis of all digital educational activities in the cloud environment. The scalability of the current description model for educational resource is not enough, it is difficult to meet the semantic description requirement of the cloud services for educational resources, more difficult to achieve the automatic management and search of the cloud services, seriously impact the sharing and interoperability of the cloud services between systems.Ontology as the core technology of Semantic Web, is a nice method to describe the hierarchical structure of concept and semantic model, and is the effective way to solve the interaction, sharing and reuse of knowledge. The standardized and formalized domain ontology provides a good solution for interoperability of information systems. In this study, the ontology is used for the description of educational resources cloud, and the description, integration, management and retrieval of cloud services of educational resources, both for achieving communication and interoperability between the cloud of educational resources, and providing an engineering reference and reuse for building for some specific educational resource cloud instance, but also for using the reasoning and matching techniques of ontology to find educational resource cloud services that most suitable for users'requirement, and them realize the discovery and selection of cloud services based on semantic, meet the users'"subject to change" cloud services requirement at anytime, anywhere. Accordingly, this study not only has practical significance, but also has some theoretical value.The main work of this study is demonstrated in the following three aspects:(1) Under the guidance of the service engineering approach based on field characteristics analysis, the dissertation defines the conception model of educational resource cloud,and constructs the domain ontology of educational resource cloud, then proposes the conception model of the educational resource cloud services, describing all data and application services as service, clearly describes the use cases of educational resource cloud services, analyzes the process of educational resource cloud services, and then constructs the application ontology of the educational resource cloud services with object-oriented ontology construction method, and effectively solves the consistency problem in describing the cloud services, through the inheritance and polymorphism of the cloud services classes and objects, solves the scalability problems in cloud service description, promotes the autonomy and sharing of cloud services.(2) In order to achieve the correctness of the ontology, this study applies the application-based ontology evaluation method, and carries out a certain amount of practice and application with the conception model of educational resource cloud services proposed in this study. Use the ontology-based concept matching technology and Racer ontology inference engine, and realizes the ontology-based intelligent retrieval of educational resource cloud services on the instance of educational cloud platform, constructs navigation architecture for resource cloud services.(3) In order to promote the practice and application of the ontology, combined with the core issue of the e-Schoolbag systems applications and the practical project of our team, based on the existing cloud computing and Web service standards published by domestic and international standards organizations and research institutions, the dissertation constructs the draft technical specifications of the resources service for e-Schoolbag, develops the technical specifications of e-Schoolbag resource service on the classification, description, metadata and meta service interface in the cloud environment, and carries out two practical instances based on this technology specification, at last conducts the overall evaluation of the draft specification, further promotes the practice and application of the educational resources cloud services.The results of the description, management and integration of educational resource cloud services In this study, has already applied in the practical environment of the HSJC education cloud, the ECNU e-Schoolbag resources service cloud, the Jiaoyuyun desktop cloud, and so on; the draft technical specifications of e-Schoolbag resource services has been accepted by the CELTSC standards organization of Ministry of Education, goes to the examination and approval procedures for the trial standard.This study is supported by the following research projects findings:Construction of Shanghai e-Education Equipment Engineering Research Center (ID:10DZ2253000), supported by "the Key Science and Technology Research Special Projects of Shanghai,2010".The cross-platform smart e-Education services platform (ID:11dz1504400), supported by "the Key Science and Technology Research Special Projects of Shanghai,2011".The environmental design and educational application innovation of the e-Schoolbag (ID:116220155), supported by "the Key projects of National Education IT Research of '12th5' Planning".Research on e-Textbook publishing and eco-development (ID:11AXW001), supported by "the National Social Science Foundation,2011".Research on interactive multimedia e-Schoolbag system development and the effectiveness of teaching (ID:CCA100119), supported by "National Youth Foundation";National informatization pilot project--the pilot demonstration project of basic education public service platform (high-tech[2009]735) supported by the National Development and Reform Commission.
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