E. Jack Chen

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Multiple independent streams of random numbers are often required in simulation studies, for instance, to facilitate synchronization for variance-reduction purposes, and for making independent replications. A portable set of software utilities is described for uniform randomnumber generation. It provides for multiple generators (streams) running(More)
This paper discusses the validity of using common random numbers (CRNs) with two-stage selection procedures to improve the possibility of correct selection and discusses the intrinsic subset pre-selection of the <i>Enhanced Two-Stage Selection</i> (ETSS) procedure. We propose using CRNs with <i>Rinott's two-stage selection</i> and ETSS procedures when the(More)
This paper discusses implementation of a two-stage procedure to determine the simulation run length for selecting the best of <i>k</i> designs. We purpose an <i>Enhanced Two-Stage Selection</i> (ETSS) procedure. The number of additional replications at the second stage for each design is determined by both the variances of the sample means and the(More)
IMPORTANCE Cognitive decline is a leading cause of disability and death in old age but its neurobiological bases are not well understood. OBJECTIVE To test the hypothesis that transactive response DNA-binding protein 43 (TDP-43) is related to late-life cognitive decline. DESIGN, SETTING, AND PARTICIPANTS Longitudinal clinical-pathologic cohort study(More)
The present study investigated the neuroanatomical and behavioral effects of human stem cell transplants into the striatum of quinolinic acid (QA)-lesioned rats. Twenty-four rats received unilateral QA (200 nM/microl) injections into the striatum. One week later, rats were transplanted with stem cells derived from human fetal cortex (12 weeks(More)
3,4-Methylenedioxymethamphetamine (MDMA; ecstasy) use has risen among women of childbearing age. Consequently, there is a substantial risk for fetal exposure from women who are, or become pregnant while abusing MDMA. However, attempts to demonstrate that prenatal MDMA results in neurochemical alterations in rat models have failed. MDMA administration to(More)
A novel population of cells that express typical immature neuronal markers including doublecortin (DCX+) has been recently identified throughout the adult cerebral cortex of relatively large mammals (guinea pig, rabbit, cat, monkey and human). These cells are more common in the associative relative to primary cortical areas and appear to develop into(More)
This paper discusses implementation of a sequential quantileestimation algorithm for highly correlated steady-state simulation output. Our primary focus is on issues related to computational and storage requirements of order statistics. The algorithm can compute exact sample quantiles and process sample sizes up to several billion without storing and(More)
  • E. Jack Chen
  • Proceedings of the Winter Simulation Conference…
  • 2005
We present a framework for deploying selection procedures in a parallel and distributed environment to identify the stochastic systems with optimal expected response when the number of alternatives is large. The goal is to speed up the process of identifying a good design with a specified probability. We present a sequential selection procedure and discuss(More)