STUDY DESIGN  Prospective cohort study. CLINICAL QUESTION  Does the patients' body mass index (BMI) influence the degree of intraoperative lumbar lordosis in patients undergoing operative treatment on the Mizuho Orthopedic Systems Incorporated (OSI) Jackson spinal table? METHODS  Twenty-four consecutive patients undergoing posterior spinal instrumentation and fusion on the Jackson table, ex...

Although extensive studies have been conducted on online social networks (OSNs), it is not clear how to characterize information propagation and social influence, two types of important but not well defined social behavior. This paper presents a measurement study of 58M messages collected from 700K users on Twitter.com, a popular social medium. We analyze the propagation patterns of general mes...

This paper attempts to develop an extended concept the competence of school principals by using concept mapping, based on issues are the competence concept of school principals have an impact on two conditions, namely: (1) to develop the concept can complement and support each other; and (2) to develop the concept of possible contradict, giving rise to different interpretations. Therefore, this...

We prove that there does not exist a subset of the plane S that meets every isometric copy of the vertices of the unit square in exactly one point. We give a complete characterization of all three point subsets F of the reals such that there does not exists a set of reals S which meets every isometric copy of F in exactly one point.

Rare event simulation in the context of queueing networks has been an active area of research for more than two decades. A commonly used technique to increase the efficiency of Monte Carlo simulation is importance sampling. However, there are few rigorous results on the design of efficient or asymptotically optimal importance sampling schemes for queueing networks. Using a recently developed ga...

Background Chest tubes are used in every case of coronary artery bypass grafting (CABG) to evacuate shed blood from around the heart and lungs. This study was designed to assess the effective of Jackson-Pratt drain in compare with conventional chest drains after CABG. Materials and Methods This was a randomized controlled trial that conducted on 218 patients in Chamran hospital from February ...

Hughlings Jackson was the first to demonstrate that paroxysmal deij vu (called by him 'reminiscence') is significantly related to disease of the temporosphenoidal region (Jackson, 1880, 1888; Jackson and Colman, 1898; Jackson and Purves-Stewart, 1899). Although he mentioned several cases of dieja vu with left-sided lesions (Jackson, 1888; Jackson and Colman, 1898) in his view the phenomenon ari...