Introduction: Quantitative evaluation is recommended to improve diagnostic ability and serial assessment of dopamine transporter (DAT) density scans. We decided to compare the ordered subsets expectation-maximization (OSEM) with filtered back-projection (FBP), and to investigate the impact of different iteration and cut-off frequencies on SBR values. Methods</stro...

The Hadamard Conjecture has been studied since the pioneering paper of J. J. Sylvester, “Thoughts on inverse orthogonal matrices, simultaneous sign successions, tessellated pavements in two or more colours, with applications to Newtons rule, ornamental tile work and the theory of numbers, Phil Mag, (1867) 461–475 first appeared. We review the importance of primes on those occasions that the con...

The efficiency and accuracy are usually regarded as two general indices to check capability of a numerical method with respect to the time integration. The traditional numerical manifold method (NMM) employs implicit scheme to obtain high computational accuracy, but the efficiency is relatively low, especially when the iterations of contacts are involved. In this paper, the temporal coupled exp...

Carbon nanotube field-effect transistors have been studied in recent years as a potential alternative to CMOS devices because of their capability of ballistic transport. In order to account properly for ballistic transport we solve the coupled Poisson and Schrödinger equations for the analysis of these devices. Conventionally the coupled Schrödinger-Poisson equation is solved iteratively with a...

the effect of boundary conditions on the solution of the inverse problem of identifying the geometry and location of a cavity inside an elastic solid body using displacement measurements obtained from a tension test is investigated. the boundary elements method (bem) coupled with the genetic algorithm (ga) and the conjugate gradient method (cgm) are implemented in this identification problem. a...

In this paper, we put forth distributed algorithms for solving loosely coupled unconstrained and constrained optimization problems. Such problems are usually solved using algorithms that are based on a combination of decomposition and first order methods. These algorithms are commonly very slow and require many iterations to converge. In order to alleviate this issue, we propose algorithms that...

Asynchronous iterations arise naturally on parallel computers if one wants to minimize idle times. This paper reviews certain models of asynchronous iterations, using a common theoretical framework. The corresponding convergence theory and various domains of applications are presented. These include nonsingular linear systems, nonlinear systems, and initial value problems. c © 2000 Elsevier Sci...