Updated on: 08/21/06

Assistant Professor, School of Public Policy, George Mason University, Arlington, VA

• Stochastic modeling and simulation in health care

• Application of Geographic Information Systems (GIS) and Spatial Statistics

• Applied statistics in health care

• University of Pennsylvania                                                    Philadelphia, PA

Ph.D. in Regional Science                                                     December 2002

 

Concentrations: Queueing Network Systems, Discrete Event Simulation, Mental Health Systems

 

Dissertation Title: “A Queueing Network Model with Blocking: Analysis of Congested Patient Flows in Mental Health Systems”

Advisor: Professor Tony Smith

 

Dissertation Summary: The dissertation investigated congestion mechanism in the psychiatric care system in Philadelphia and possible solutions to address the congestion problems. Based on data from 1997 and 1998, a mathematical queuing network model with blocking was developed and solved to assess the steady state congestion levels at four types of psychiatric facilities. The analyses identified a bottleneck in the system, offering some policy implications related to the most efficient way to relieve the congestion. Simulation analysis (discrete event simulation) was also conducted to investigate the transient behavior of congestion at each facility.

• University of Pennsylvania                                                    Philadelphia, PA

M.A. in Regional Science                                                      May 1994

• Aoyama-Gakuin University                                                    Tokyo, Japan

B.A. in Business Administration / Economics                            March 1992

• Hyogo College of Medicine                                                   Hyogo, Japan

(Thesis) Ph.D. in Environmental and Preventive Medicine            March 2005

 

Concentrations: Health care system simulations, Medical statistics

 

Advisor: Professor Hiroshi Iguchi

• George Mason University                                                      Arlington, VA

Visiting Assistant Professor                                                   2004 - 2005

School of Public Policy

•  University of Pennsylvania                                                    Philadelphia, PA

Post-doctoral Researcher                                                       2003 - 2005

Department of Electrical and Systems Engineering

 

Economic Analyst, School of Medicine                                    2002 - 2003

Part-time Research Assistant, School of Medicine                      1999 - 2001

•  London School of Economics                                                London, U.K.

Research Assistant, Department of Economic Geography            Summer 1996

• Stone & Webster Consultants, Inc.                                         Washington, DC

Consultant / Economist                                                        2001 - 2002

Stone & Webster Consultants, Regulation and Privatization Practice

 

Economic and financial analyses for water and energy sector privatization projects. The tasks involved tariff (price) setting, contingent valuation (CV) studies and affordability studies related to water sector privatization in developing countries.

• European Bank for Reconstruction and Development (EBRD)      London, U.K.

Evaluation Analyst                                                               1998 - 1999

Project Evaluation Department

 

Evaluated municipal water and sewage utility restructuring programs in Croatia and Romania. The tasks involved the review and update of financial models, sensitivity analyses, other economic studies such as affordability studies, and the assessment of transition/economic impacts of the projects.

• Inter-American Development Bank                                          Washington, DC

Junior Social Development Consultant                                     1996 - 1997

Summer Intern                                                                    Summer 1996

Social Operations, Region II

 

Statistical analyses for social sector reform projects in Latin America. The tasks included statistical work (i) to determine the tenure types in the housing sector in Panama, Guatemala and Costa Rica and (ii) to estimate demand for private and public health care services for children in rural and urban areas in Haiti.

• R01, National Institute of Mental Health (NIMH)                          

   

  Role: Co-P.I. 

  P.I. Dr. Eri Kuno, School of Medicine, University of Pennsylvania

   

  The research project extends the above R21 project, and refines the theoretical work to address practical, real-world situations.

   

• R21, National Institute of Mental Health (NIMH)                    2003 - 2005

Role: Main Analyst (as a member of Key Personnel)                       

P.I.: Dr. Eri Kuno, School of Medicine, University of Pennsylvania, Philadelphia, PA

 

The grant extends the Ph.D. dissertation. This project is described in the section, Main Current Research Work, below.   

• University Fellowship, University of Pennsylvania                      1994 - 1996

• NIMH funded grant project to extend Ph.D. dissertation that assessed the congestion in a mental health system with long-term care facilities. The main extensions involve (i) relaxation of assumptions related to patient flows and arrival/service patterns, (ii) model extension to capture patients’ diagnosis differences (i.e., multi-class queueing model), (iii) development of a cost optimization model, and (iv) further investigation of transient blocking behavior using both simulation and mathematical (i.e., fluid and diffusion models) approaches. Simulation programs have been developed in Matlab as part of this extension work. A test web-based (i.e., Java applet) program was also developed in collaboration with a post-doctoral researcher, Dr. Huang, in the Department of Computer Science at the University of Pennsylvania. The goal of this project is to develop a decision support tool for mental health policy makers so they can formulate appropriate residential placement choices.

• Bayesian estimation of Weibull mixture distributions for censored survival models. The length of stay data of psychiatric patients in various residential settings have been used to estimate a mixture with a fixed number of components using Gibbs sampling. In addition, a product-slice-sampler has been introduced to estimate the conditional posterior distribution of the Weibull shape parameters.

• Research project to examine the demand on various types of mental health agencies in Philadelphia. The data include characteristics of both consumers and providers, their locations, and their neighborhood characteristics. The determinants of consumers’ agency selection have been investigated using conditional multinomial logit models. The results of the regressions will be mapped to compare empirical and predicted spatial demand patterns using GIS (ArcView). The impacts of some policy and social structural changes (i.e., budget allocation to these agencies or changes in racial composition of some areas) on spatial demand patterns will then be investigated.

• Dispersion model for foot-and-mouth (FMD) disease using the monthly data in 2001 from England, U.K. The map of the diseased cattle and its geographical spread in 2001 has been prepared in GIS (ArcView) to construct a simulation model of disease dispersion under various scenarios. The effectiveness of disease control and prevention mechanisms (vaccination, slaughtering, custom-control, etc.) has also been studied to derive economic consequences of each scenario.

• Koizumi, N., Kuno, E., and Smith, T.E. “Modeling Patient Flows Using a Queueing Network with Blocking” (Health Care Management Science, Vol. 8, No.1, February 2005) pp. 49-60

• Koizumi, N., Iguchi, H and Smith, T.E. “Comparison and Verification of BSE Surveillance in USA and Japan” (Environmental Health and Preventive Medicine, Vol.10, No. 3, May 2005)

• Kuno, E., Koizumi, N., Rothbard, A., and Greenwald J. “A Service System Planning Model for Individuals with Serious Mental Illness” (Mental Health Services Research, Vol. 7, No. 3, September 2005)

• Koizumi, N. and McCann, P. “Housing Decisions in Panama: A Log-Linear Analysis” (Journal of Housing Economics, Forthcoming)

• Koizumi, N. and Kuno, E. “A Queuing Network Model with Blocking: Analysis of Congested Patient Flows in Mental Health Systems” Proceedings of  Western Multi-conference, The Society for Modeling and Simulation International, San Antonio, TX, USA 2002, pp40-48

• Koizumi, N., McCann, P. “Housing Decisions in Panama: A Log-Linear Analysis” Proceedings of European Regional Science Association 2003 Congress, Jyväskylä, Finland

• “The Cost Effectiveness of A CBT Suicide Intervention Program” with Rothbard, A. (Completed)

• “Decision Factors in Mental Health Service Provider Selection and Client Utility Changes Caused by Changes in the Mix of Service providers” with Kuno, E. (Final Stage)

• “Bayesian Analysis for Hospital Waiting Time Distribution” with Smith, T.E. (In Progress)

• Koizumi, N. (November 2005) “Cost Minimization Using Simulation: An Application of a Metamodel to Analyze an Optimal Housing Array for Mentally Ill” at the North American Conference of Regional Science Association, Las Vegas, NV, USA

• Koizumi, N. (November 2004) “Decision Factors in Mental Health Service Provider Selection and Client Utility Changes Caused by Changes in the Mix of Service Providers” at the North American Conference of Regional Science Association, Seattle, WA, USA

• Koizumi, N. (October 2003) “A Queueing Network Model with Blocking: Analysis of Congested Patient Flows in Mental Health Systems” at the Annual Meeting of the Institute for Operations Research and the Management Sciences (INFORMS), Atlanta, GA, USA

• Koizumi, N. and McCann, P. (August 2003) “Housing Decisions in Panama: A Log-Linear Analysis” at the European Conference of Regional Science Association, Jyväskylä, Finland

• Koizumi, N. (January 2002) “A Queuing Network Model for the Bed Capacity Planning for the Mental Health Care System in Philadelphia” at the Western Multi-conference, The Society for Modeling and Simulation International, San Antonio, TX, USA

• Microeconomics

• Statistics and Quantitative Methods

• Urban and Spatial Economic Theory

• Spatial Statistics using ArcView (GIS application)

• Stochastic Modeling and Simulation

Courses for Master of Public Policy (MPP) program at School of Public Policy (SPP), George Mason University:

• Statistical Method for Policy Analysis (http://classweb.gmu.edu/nkoizumi/PUBP704/syllabus.htm)

• Managerial Economics and Policy Analysis (http://classweb.gmu.edu/nkoizumi/PUBP720/syllabus.htm)

• Spatial Data Analysis with GIS (http://classweb.gmu.edu/nkoizumi/PUBP710-004/syllabus.htm)

•  Health Care Management Science (2)

• Regional Science Association International (RSAI)

• Institute for Operations Research and the Management Sciences (INFORMS)

• Academy Health

• Software / Operating Systems

  Matlab, ArcView (GIS), Stata, SAS, SPSS, Arena, Scientific Word, MS Office including all basic software, PowerPoint, Access and FrontPage / UNIX, Windows

• Languages: Fluent in English and Japanese (native), Basic Russian

• Citizenship:                           Japan

• Gender:                                Female

• Personal home page:               http://mason.gmu.edu/~nkoizumi/main/index.htm