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Proxy re-encryption (PRE) has recently become a hot topic in cryptography research field. PRE can be classified as single-hop PRE and multi-use PRE according to the times the cipher text can be transformed. Finding a unidirectional, multi-use, and chosen cipher text attack (CCA) secure PRE is presented as an open problem by Green et al. Wang claimed to resolve this problem by proposing the first multi-use...
Collaborative filtering (CF) is an important and popular technology for recommender systems. However, current CF methods suffer from such problems as data sparsity, recommendation inaccuracy, and big-error in predictions. In this paper, we borrow ideas of object typicality from cognitive psychology and propose a novel typicality-based collaborative filtering recommendation method named TyCo. A distinct...
With the dramatic growth of E-commerce's popularity, the amount of products and services reviews are increasing rapidly. Many researchers put effects on mining user opinions from reviews. There are many research works in opinion mining. However, all current methods are focusing on how to handling the opinion mining for English language, Chinese, Japanese and so on. There lacks works on how to conduct...
In recent years, Community Question Answering (CQA) service becomes more and more popular, which enables users to ask and answer questions on the web. One important problem is how to find out experts who are qualified and willing to answer the question. Also, with the rapidly increasing number of new questions, experts of experienced in specified domains are not easy to find their interested questions...
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