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Skyline query has been gaining much interest in database research communities in recent years. Most existing studies focus mainly on centralized systems, and resolving the problem in a distributed environment such as a peer-to-peer (P2P) network is still an emerging topic. The desiderata of efficient skyline querying in P2P environment include: 1)(More)
The objective of the present study was to investigate the effects of cerebral ischemia-reperfusion on pharmacokinetics of paeoniflorin after intravenous administration of Paeoniae Radix extract (PRE) in rats. The cerebral ischemia-reperfusion rats were induced by occluding the bilateral carotid arteries of normal rats for 2 h, followed by reperfusion. The(More)
Intestinal microbiota is known to be important in health and disease. Its composition is influenced by both environmental and host factors. Few large-scale studies have evaluated the association between host genetic variation and the composition of microbiota. We recruited a cohort of 1,561 healthy individuals, of whom 270 belong in 123 families, and found(More)
Parameter estimates for associated genetic variants, reported in the discovery samples are often grossly inflated compared to the values observed in the follow-up samples. This type of bias is a consequence of the sequential procedure as a declared associated variant must first pass a stringent significance threshold. We propose a hierarchical Bayes method(More)
STUDY OBJECTIVE To assess the effect on ovarian reserve function after laparoscopic uterine artery occlusion (LUAO) compared with laparoscopic surgery supracervical hysterectomy (LSH) and laparoscopic myomectomy (LM). DESIGN Prospective cohort study (Canadian Task Force classification II-1). SETTING Hospital with experience in gynecologic minimal access(More)
Eighteen different triterpene saponins isolated from Polygala tenuifolia were investigated by electrospray ionization ion trap multiple-stage mass spectrometry (ESI-ITMS(n)) in positive and negative ion modes. MS(1)-MS(3)/MS(4) spectra of the both modes were analyzed, and they all gave fragments in line and shared common fragmentation patterns. Key(More)
This paper studies the eects of various types of online advertisements on purchase conversion by capturing the dynamic interactions among advertisement clicks themselves. It is motivated by the observation that certain advertisement clicks may not result in immediate purchases, but they stimulate subsequent clicks on other advertisements which then lead to(More)
P rocurement auctions are sometimes plagued with a chosen supplier's failing to accomplish a project successfully. The risk of project failure is considerable, especially when the buyer has inadequate information about suppliers ex ante and the project can only be evaluated at the end. To manage such uncertainty, a model of competitive procurement and(More)