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The preservation of confidentiality has become a major issue for the majority of applications that process personal information, the sensitivity of this information requires creators to set rules for the sharing and use of access control policies. A great deal of research has already been conducted in educational environments. However, one aspect that has not received much attention is the important role of Information Security, especially in newer education environments such as the e-learning environment. In this article we seek to propose a policy of security in such a way to affect views of profiles for each user to control the information accessed by this user. 相似文献
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[I].Synthesisandpalladium -catalyzedcross -couplingreac tionoftris[4 - (trimethylsilyl)furan - 3-yl]boroxineandtris[4 -(substituted)furan - 3-yl]boroxine .3,4 -Disubstitutedfuransareimportantbuildingblocksofhet erocycliccompounds,inacontinuationofthestudyonpossibleroutesto 3,4 -disubstitutedfuran ,Iwasinterestedinexploringtheroleofasilylgroupasapotentialdirectinggroupbecausesilylgroupsarewell-knownfortheir ( -donatingcharacter.Theirtendencytostabilizea ( -carbocationthroughtheso -called (p - (… 相似文献
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Thomas R. Murray 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2003,49(6):637-638
International Review of Education - 相似文献
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周明林 《周口师范学院学报》2011,28(2):55-56,61
基于特殊准随机结构模型,采用第一性原理计算对Al-Si亚稳相体系进行了研究,所得结果与实验吻合很好,表明特殊准随机结构模型可以有效地预测固溶体的结构和热力学性质. 相似文献
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