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Past Operations and Logistics Division and Centre for Operations Excellence Seminars

Past OPLOG Division Seminars - September 2016 - July 2017
Past OPLOG Division and COE Seminars - September 2015 - August 2016

Past OPLOG Seminars January 2015 -  August 2015
Past OPLOG Seminars - August 2014 - December 2014
Past OPLOG Seminars September 2013 - May 2014

Past OPLOG Seminars - September 2012 - May 2013

Past OPLOG Division Seminars from September 2017- June 2018
 



Date: Monday, July 23rd, 2018

Speaker: Guohua Wan, Shanghai Jiao Tong University
Title:  "Home Services Routing and Appointment Scheduling with Stochastic Service Times"
Time: 2:30 PM - 3:30 PM
Place: Henry Angus 969

Abstract: Motivated by the practices of home services, we consider an integrated routing and appointment scheduling problem with stochastic service times. Given a set of customers with known locations and random service times, the professional operator has to visit each customer location exactly once to provide the services. The objective of the problem is to determine the visit route and the appointment times for the customers so as to minimize the total costs of idling of the operator, waiting of the customers and traveling. Given that the distributions of service times are known, we develop a two-stage stochastic programming model using sample average approximation and propose an integer L-shaped method to solve the problem. We also propose an easy-to-implement heuristic algorithm that allows solving large-size problem efficiently. For the case that only the mean and variance are known for the service times, we propose a method based on a mixed integer second order cone program to deal with the problem. The effectiveness and efficiency of these methods are demonstrated through computational experiments on randomly generated problem instances.


Date:
Friday, August 3rd, 2018

Speaker: Moshe Haviv, The Hebrew University of Jerusalem
Title:  "Externalities, optimization and regulation in queues"
Time: 12:30 PM - 1:30 pm
Place: Henry Angus 968

Abstract
: The academic research on queues deals mostly with waiting. Yet, the externalities,  namely the added waiting time an arrival inflicts on others, are of no less, if not of more, importance. The talk will deal mostly with how the analysis of  externalities leads to the socially optimal behavior, while solving queueing dilemmas such as whether or not to join a queue, when to arrive to a queue, or from which server to seek service at. Customers, being selfish, do not mind the externalities they impose on others. We show how in queues too, internalizing the externalities leads to self regulation. In this setting selecting the service regime is one of the tools in one's arsenal.

 (Joint with Binyamin Oz)


 

Date: Monday, September 10th, 2018

Speaker: Rajesh Vijayaraghavan, UBC Sauder School of Business
Title:  "TBA"
Time: 2:30 PM - 3:30 PM
Place: Henry Angus 968

Abstract
: TBA


 Date: Monday, September 17th, 2018

Speaker: George Shanthikumar, Purdue University
Title:  "TBA"
Time: 2:30 PM - 3:30 PM
Place: Henry Angus 968

Abstract
: TBA

 


Date: Monday, September 24th, 2018

Speaker: Xuanming Su
Title:  "TBA"
Time: 2:30 PM - 3:30 PM
Place: Henry Angus 968

Abstract
: TBA



Date: Monday, October 1st, 2018

Speaker: Saibal Ray, McGill University
Title:  "TBA"
Time: 2:30 PM - 3:30 PM
Place: Henry Angus 968

Abstract
: TBA


Date: Monday, October 15th, 2018

Speaker: Fernando Bernstein, Duke University
Title:  "TBA"
Time: 2:30 PM - 3:30 PM
Place: TBA

Abstract
: TBA


Date: Friday, November 9th, 2018

Speaker: Miguel Anjos, Polytechnique Montreal
Title:  "Mathematical optimization approaches for facility layout problems: The state-of-the-art and future research directions"
Time: Noon - 1:00 PM
Place: Henry Angus 333

Abstract
: Facility layout problems are an important class of operations research problems that has been studied for several decades. Most variants of facility layout are NP-hard, therefore global optimal solutions are difficult or impossible to compute in reasonable time. Mathematical optimization approaches that guarantee global optimality of solutions or tight bounds on the global optimal value have nevertheless been successfully applied to several variants of facility layout. This review covers three classes of layout problems, namely row layout, unequal-areas layout, and multifloor layout.  We summarize the main contributions to the area made using mathematical optimization, mostly mixed integer linear optimization and conic optimization. For each class of problems, we also briefly discuss directions that remain open for future research.


Date: Monday, December 3rd, 2018

Speaker: Karla Hoffman, George Mason University
Title:  "TBA"
Time: 2:30 PM - 3:30 PM
Place: Henry Angus 968

Abstract
: TBA




Date:  Tuesday, June 19th, 2018 Speaker: David Stanford, The University of Western Ontario Title:  "An updated approach to Emergency Department prioritization in light of empirical data" Time: Noon - 1:00 PM Place: Henry Angus 968
Date:  Tuesday, June 19th, 2018 Speaker: David Stanford, The University of Western Ontario Title:  "An updated approach to Emergency Department prioritization in light of empirical data" Time: Noon - 1:00 PM Place: Henry Angus 968
Date:  Tuesday, June 19th, 2018 Speaker: David Stanford, The University of Western Ontario Title:  "An updated approach to Emergency Department prioritization in light of empirical data" Time: Noon - 1:00 PM Place: Henry Angus 968
Date:  Tuesday, June 19th, 2018 Speaker: David Stanford, The University of Western Ontario Title:  "An updated approach to Emergency Department prioritization in light of empirical data" Time: Noon - 1:00 PM Place: Henry Angus 968