Social prolonged waiting time for admission from emergency department (ED) to inpatient beds is a leading cause of ED overcrowding and can negatively impact patient safety. In this talk, (a) I will review and compare two service time models that attempt to capture time-of-day effect of the waiting time; they are the two-time-scale service time model of Shi et al (2016) and the inspection-delay service time model of Chan, Dong and Green (2016). (b) I will demonstrate the role of Stein method to generate approximations for waiting time performance that is accurate in a variety of parameter regimes. (c) I will discuss the recent effort in developing approximate dynamic programming algorithms to optimize the trade-off between waiting time and the fraction of patients who are assigned to non-primary beds. This is a joint work with Pengyi Shi at Purdue University.
Jim Dai joined Cornell University in 2012 as a professor in the School of Operations Research and Information Engineering (ORIE). Prior joining Cornell, he held the Chandler Family Chair of Industrial and Systems Engineering at Georgia Institute of Technology, where he was a faculty member from 1990 to 2012. He is a Special Term Professor at Tsinghua University. He was a James Riady Distinguished Visiting Professor in Decision Sciences at National University of Singapore (May 2009-Apr 2011), a visiting professor at Aarhus University (Oct 1998-Dec 1998) and Stanford University (Dec 1998-June 1999), and a visiting assistant professor at University of Wisconsin-Madison (Aug 1991-Dec 1991). Jim is an elected fellow of Institute of Mathematical Statistics and an elected fellow of Institute for Operations Research and the Management Sciences (INFORMS). Jim currently serves on the Advisory Board for Engineering Systems and Design at Singapore University of Technology and Design. He serves as Editor-in-Chief for Mathematics of Operations Research, as an Advisory Editor for Stochastic Systems, and as an Associate Editor for Probability Survey and for Journal of Applied Probability. He currently also serves on IMS Committee on Special Lectures. He served as an Area Editor for Operations Research, as a Series Co-Editor for Handbooks in Operations Research and Management Science, and as an Associate Editor for Management Science and for Queueing Systems. Dai served on INFORMS Lanchester Prize Committee, on INFORMS John von Neumann Theory Prize Committee, and on editor-in-chief search committee for Mathematics of Operations Research and for Stochastic Systems.
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