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Problem
Previous studies had shown that there might be an association between serum vitamin D concentrations and the occurrence of recurrent spontaneous abortion (RSA). However, the conclusions remained controversial. The objective of this study was to systematically review the evidence for an epidemiological association between vitamin D and RSA.
Method of study
The literature search was performed...
Linguistic truth-valued intuitionistic fuzzy pairs can express fuzzy information with both positive side and negative side at the same time. In this paper, we construct a linguistic knowledge representation model using linguistic truth-valued intuitionistic credibility factors, which can express the positive evidence and the negative evidence in a rule with truth value and false value respectively...
The e-commerce applications based on Web cluster are expected to provide differentiated services to different users. The latest proposed DDSD (demand-driven service differentiation) algorithm for Web cluster was QoS-aware. It used M/M/1 queuing system to model single back-end Web server node. But many works show that the service time of Web server can be represented by independently and identically...
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