Publications

Ph.D. dissertation
Many-Server Queues with Time-Varying Arrivals, Customer Abandonment and Non-exponential Distributions. [PDF]

 

 

 

 

 

 

 

 

 

Here are three seminars by Prof. Ward Whitt based on my dissertation:

  • Multi-Server Queues with Time-varying Arrival Rates, Markov Lecture INFORMS Applied Probability Society, INFORMS conference, Austin, TX, November 08, 2010 [PDF]
  • Queueing Models for Large-Scale Service Systems Experiencing Periods of Overloading, Seminar at MIT Operations Research Center, April 5, 2012 [PDF]
  • Staffing to Stabilize Performance at Target Levels in Many-Server Queues with Time-Varying Arrivals, Longer Service Times and Flexible Staffing, Applied Probability and Risk Seminar, September 12, 2013 [PDF]

Papers published and accepted

  • A Network of Time-Varying Many-Server Fluid Queues with Customer Abandonment. Operations Research, vol. 59, July-August 2011, pp. 835-846. (With Ward Whitt) [PDF]
    • e-Companion. [PDF]
    • Longer version. [PDF]
  • Large-Time Asymptotics for the Gt/Mt/st+GIt Many-Server Fluid Queues with Abandonment. Queueing Systems, vol. 67, 2011, pp. 145-182. (With Ward Whitt) [PDF]
  • Nearly Periodic Behavior in the The Overloaded G/D/S+GI Queue. Stochastic Systems, vol. 1, No. 2, 2011, p. 340-410. (With Ward Whitt) [PDF]
    • Appendix [PDF]
  • A Fluid Approximation for Large-Scale Service SystemsPerformance Evaluation Review, Special issue on 2011 MAMA conference. [PDF]
  • The Gt/GI/st+GI Many-Server Fluid Queue. Queueing Systems, vol. 71, No. 4, 2012, pp. 405-444. (With Ward Whitt) [PDF]
    • Longer version. [PDF]
  • Stabilizing Customer Abandonment in Many-Server Queues with Time-Varying Arrivals. Operations Research, vol. 60, No. 6, 2012, pp. 1551-1564. (With Ward Whitt) [PDF]
    • e-Companion. [PDF]
    • Longer version. [PDF]
  • A Many-Server Fluid Limit for the Gt/GI/st+GI Queueing Model experiencing Periods of Overloading. Operations Research Letters, vol. 40, 2012, pp. 307-312. (With Ward Whitt) [PDF]
  • Introduction to Levy Processes. Encyclopedia of Operations Research and Management Science. 2013. (With Chien-Chia Huang) [PDF]
  • Algorithms for Time-Varying Networks of Many-Server Fluid Queues. INFORMS Journal on Computing. vol. 26, No. 1, 2014, pp. 59-73. (With Ward Whitt) [PDF]
    • e-CompanionAlgorithms for Time-Varying Networks of Many-Server Fluid Queues: e-CompanionINFORMS Journal on Computing, vol. 26, No. 1, 2014. (With Ward Whitt) [PDF].
  • Many-Server Heavy-Traffic Limits for Queues with Time-Varying ParametersAnnals of Applied Probability. vol. 24, No. 1, 2014, pp. 378-421. (With Ward Whitt) [PDF
  • Stabilizing Performance in Networks of Queues with Time-Varying Arrival Rates. Probability in the Engineering and Informational Sciences. vol. 28, No. 4, 2014, pp. 419-449. (With Ward Whitt) [PDF]
    • Appendix [PDF]
  • A Law of Iterated Logarithm for Multiclass Queues with Preemptive Priority Service Discipline. Queueing Systems. vol. 79, 2015, pp. 251-291.(With Yongjiang Guo) [PDF]
  • Combined Inversion and Thinning Methods for Simulating Nonstationary Non-Poisson Arrival Processes. Proceedings of the 2015 Winter Simulation Conference. (With Ran Liu, Michael E. Kuhl and James R. Wilson) [PDF]
  • Approximations for Heavily-Loaded G/GI/n+GI Queues. Naval Research Logistics, vol. 63, 2016, pp. 187-217. (With Ward Whitt and Yao Yu) [PDF]
    • Appendix [PDF]
  • Staffing a Service System with Non-Poisson Nonstationary Arrivals. Probability in the Engineering and Informational Sciences, vol. 30, 2016, pp. 593-621. (With Beixiang He and Ward Whitt) [PDF]
  • Stabilizing Performance in a Service System with Time-Varying Arrivals and Customer Feedback. European Journal of Operational Research, vol. 256, No. 2, 2017, pp. 473-486. (With Ward Whitt) [PDF]
    • Appendix [PDF]
  • Functional Law of Iterated Logarithm for Multi-Server Queues with Batch Arrivals and Customer Feedback. Published online at Annals of Operations Research. 2017. (With Yongjiang Guo and Renhu Pei) [PDF]
  • Heavy-Traffic Limit for Initial Content Process. Stochastic Systems. vol. 7, No. 1, 2017, pp. 95 – 142. (With Korhan Aras and Ward Whitt) [PDF]
    • Appendix [PDF]
  • Modeling and Simulation of Nonstationary Non-Poisson Processes. Accepted at INFORMS Journal on Computing. (With Ran Liu, Michael E. Kuhl and James R. Wilson) [PDF]
    • Appendix [PDF]
  • Staffing to Stabilize the Tail Probability of Delay in Service Systems with Time-Varying Demand.
    Forthcoming at Operations Research. First place of the 2016 INFORMS JFIG competition [PDF]
    • e-Companion [PDF]
    • Appendix [PDF]

Working papers

  • Many-Server Gaussian Limit for Queues with Customer Abandonment and Non-Exponential Service Times. Submitted to Queueing Systems, Special Issue in honor of Ward Whitt’s 75th birthday. (With Korhan Aras and Xinyun Chen) [PDF]
  • Optimal Controls to Remote Queues. (With Shuangchi He and Yao Yu)
  • Dedicated or Pooled: System Design in Large-Scale Service Networks. (With Ping Cao, Junfei Huang and Shuangchi He)
  • Dynamic Pricing in One-Way Car Sharing Networks: A Distributional Fluid Approximation Approach. (With Shuangchi He, Yang Liu and Ling Zhang)
  • A Functional Law of the Iterated Logarithm for Multi-Class Queues with Batch Arrivals. (With Yongjiang Guo)
  • Reducing Delays in Retrial Queues by Simultaneously Differentiating Service Rates and Retrial rates. (With Jinting Wang and Zhongbin Wang)
  • Physician Staffing in Emergency Department via Multi-class Multi-Stage Network: Opening the Blackbox. (With Caglar Caglayan, Turgay Ayer, Mustafa Sir, Kalyan Pasupathy, David Nestler)
  • Optimal Control of Double-Ended Queues with Abandonment and Nonstationary Demand. (With Chihoon Lee, Xin Liu and Ling Zhang)
  • Approximations for the Time-varying Nonexponential Queues. (With Ward Whitt and Yao Yu)
  • A Functional Weak Law of Large Numbers for the Time-Varying (Gt/GI/st+GI)m/Mt Queueing Network. Working paper. (With Korhan Aras) [PDF]
  • A Fluid Model for the Multi-Class Network Queues with Time-Varying Arrivals and Prescribed Routing Paths.
  • Diffusion Limits for the Time-Varying Many-Server Network Queues with Customer Abandonment.

Papers with students

  • Beixiang He (graduated in August 2014)
    • Ph.D. DissertationMulti-Class Queueing Networks with Time-Varying Arrivals: Performance Approximations and Staffing Design.
    • Staffing a Service System with Non-Poisson Nonstationary Arrivals. Probability in the Engineering and Information Sciences, vol. 30, 2016, pp. 593-621. (With Beixiang He and Ward Whitt) [PDF]
  • A. Korhan Aras (graduated in March 2016)
    • Ph.D. Dissertation: Two-Parameter Heavy-Traffic Limits for Queues with Non-Exponential Service and Patience Times.
    • A Functional Weak Law of Large Numbers for the Time-Varying (G_t/GI/s_t+GI)^m/M_t Queueing Network. [PDF]
    • Heavy-Traffic Limit for Initial Content ProcessStochastic Systems.  vol. 7, No. 1, 2017, pp. 95 – 142. (With Ward Whitt) [PDF]
    • Many-Server Gaussian Limit for Queues with Customer Abandonment and Non-Exponential Service Times. Submitted to Queueing Systems, Special Issue in honor of Ward Whitt’s 75th birthday. (With Korhan Aras and Xinyun Chen) [PDF]
  • Yao Yu (graduated in March 2017)
    • Ph.D. Dissertation: Performance Approximations and Controls to Queueing Networks
    • Approximations for Heavily-Loaded G/GI/n+GI Queues. Naval Research Logistics, vol. 63, 2016, pp. 187-217. (With Ward Whitt) [PDF] – Appendix [PDF]
    • Optimal controls to Remote Queues. Working paper. (With Shuangchi He)
  • Ling Zhang (Ongoing)
    • Ph.D. Dissertation: Optimal Controls in Time-Varying Service Networks: Asymptotic Effectiveness and Performance Optimization 
    • Dynamic Pricing in One-Way Car Sharing Networks: A Distributional Fluid Approximation Approach. Working paper. (With Yang Liu and Shuangchi He) [PDF]
    • Optimal Control of Double-Ended Queues with Abandonment and Nonstationary Demand. (With Chihoon Lee and Xin Liu)
  • Kyle Hovey (Ongoing)
    • Ph.D. Dissertation: Optimal Staffing in Nonstationary Service Networks.