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| 1 | 一种改进的云存储数据完整性验证方案显示文摘云存储为用户提供了便利的存储服务,但使用户失去了对其数据的直接控制,难以保证数据的完整性和可用性。本文在分析现有完整性验证方案的基础上,提出一种基于RSA签名体制的改进验证方案,该方案能有效检验服务器是否完整存储用户数据,支持公开审计,保护用户私密信息,并能准确定位发生错误的数据块。通过安全分析和性能分析表明,本方案是一个高效可行的数据完整性验证方案。 | 戴颖玲 陈俊杰 周德华 陈杰朗 | 2016 | 计算机与现代化2016，，10： | 0 |
| 2 | User-Level Sentiment Evolution Analysis in Microblog显示文摘People's attitudes towards public events or products may change overtime,rather than staying on the same state.Understanding how sentiments change overtime is an interesting and important problem with many applications.Given a certain public event or product,a user's sentiments expressed in microblog stream can be regarded as a vector.In this paper,we define a novel problem of sentiment evolution analysis,and develop a simple yet effective method to detect sentiment evolution in user-level for public events.We firstly propose a multidimensional sentiment model with hierarchical structure to model user's complicate sentiments.Based on this model,we use FP-growth tree algorithm to mine frequent sentiment patterns and perform sentiment evolution analysis by Kullback-Leibler divergence.Moreover,we develop an improve Affinity Propagation algorithm to detect why people change their sentiments.Experimental evaluations on real data sets show that sentiment evolution could be implemented effectively using our method proposed in this article. | ZHANG Lumin JIA Yan ZHU Xiang ZHOU Bin HAN Yi | 2014 | China Communications2014，11，12： | 0 |
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