2015 Informs Annual Meeting

SC69

INFORMS Philadelphia – 2015

1 - Railroad Operations Efficiency and Recovery Erick Wikum, Principal Scientist, Tata Consultancy Services, 1000 Summit Drive, Milford, OH, 45150, United States of America, erick.wikum@tcs.com, Jeffrey Guelker, Bob Gutman, Clark Cheng In the railroad industry, achieving efficient operations and developing the capability to recover from inevitable disruptions are key to both customer service and financial performance. In this session, the first of two, panelists from the railroad industry worldwide explore how to define and measure efficiency and recovery and share case studies and a vision for the role OR/MS and analytics has played and can play in operational efficiency and recovery. SC71 71-Room 202B, CC Public Transportation Modeling Sponsor: TSL/Urban Transportation Sponsored Session Chair: Nicholas Lownes, University of Connecticut, 261 Glenbrook Rd, U-3037, Storrs, Co, 06269, United States of America, nlownes@engr.uconn.edu 1 - Optimizing Transit Network Design for Equity Kelly Bertolaccini, Ph. D. Candidate, University of Connecticut, 260 Glenbrook Rd, Storrs, CT, 06269, United States of America, klb06003@engr.uconn.edu, Nicholas Lownes The equitable provision of public transit services is a major concern for planners worldwide, yet few tools are currently available for those seeking to incorporate equity into their transit network designs. This research proposes a method for directly incorporating equity into the stop grouping and stop sequencing components of the Transit Network Design Problem. An iterative process is used to combine the stop sequencing and grouping models to design equitable, multi- route transit systems. 2 - Integrated Planning of Park-and-Ride Facility and Transit Service Ziqi Song, Assistant Professor, Utah State University, 4110 Old Main Hill, Logan, UT, 84322-4110, United States of America, ziqi.song@usu.edu This research proposes an integrated planning framework to strategically locate park-and-ride (P&R) facilities and optimize transit service frequency simultaneously. P&R users’ route choice behavior is explicitly considered and a link-based multimodal user equilibrium model is established. The optimal P&R facility and transit service design problem is formulated as a mathematical program with complementarity constraints, and a solution algorithm based on the active-set approach is used. 3 - Evaluating Zoning Strategies for Demand Responsive Transit Systems Mahour Rahimi, University of Massachusetts, Amherst, 139 Marston Hall, 130 Natural Resources Rd., Amherst, MA, 01003, United States of America, mrahimi@umass.edu, Eric Gonzales DRT systems often divide their service area into smaller regions in order to simplify operations. However, this management strategy can create inefficiencies. This paper develops an analytical formulation to explain the relation between agency cost and zoning strategies. The two main objectives are to understand when a service area needs to be divided into smaller regions to reduce the total costs of a DRT system and how the split should be done in order to be the most cost effective. 4 - Effects of Real-time Information Services over the Performance of Transit Systems

analyzed. 4 - Effective and Equitable Supply of Gasoline to Impacted Areas in The Aftermath of a Natural Disaster Rajan Batta, Suny Distinguished Professor, University at Buffalo (SUNY), 410 Bell Hall, Buffalo, United States of America, batta@buffalo.edu, Changhyun Kwon, Xiaoping Li Supply chain disruptions of hazmat commodities, such as gas shortages, have resulted from the post-natural disaster conditions as seen during and after Hurricane Sandy, 2008, China winter storms and the 2010 Chilean earthquake. We develop a transportation logistics model aimed at providing feasible and cost- effective solutions to alleviate the impact of gasoline shortage. SC69 69-Room 201C, CC Facility Logistics I Sponsor: TSL/Facility Logistics Sponsored Session Chair: Sadan Kulturel-Konak, Professor, Pennsylvania State University, Berks Campus, Reading, PA, 19609, United States of America, sadan@psu.edu 1 - Distribution Operations with Item Location Uncertainty Jennifer Pazour, Assistant Professor, Rensselaer Polytechnic Item location uncertainty can occur in a number of environments, including sea- based, healthcare, and retail logistics environments. Yet, such existence has been ignored in existing warehouse and distribution decision making models. Thus, we develop analytical models to study the impact of item location uncertainty on order-fulfillment policies and logistics performance measures. 2 - Optimal Assignment of Airport Baggage Unloading Zones to Outgoing Flights Marc Goetschalkx, marc.goetschalckx@isye.gatech.edu, Pratik Mital, Edward Huang In this work, the airport outbound baggage assignment problem is modeled as a Vector Assignement Problem (VAP). VAP is a new category of optimization problems which belongs to the class of Assignment Problems (AP), but has unique properties which make it harder to solve. A real airport case study is presented, to which the optimization models developed are applied. The performance of the optimization models is compared to typical heuristics used in the literature to solve this problem. 3 - Using Real-time Employee Location to Make Hospital Transport Assignments Dale Masel, Associate Professor, Ohio University, 270 Stocker Center, Athens, OH, 45701, United States of America, masel@ohio.edu, Connor Mcmahon, Seth Hostetler In a hospital, employees who are responsible for transporting patients and equipment are a critical resource for patient care and efficient operations. Getting patients to appointments on time is essential for preventing delays at the labs and clinics in the hospital. By knowing where each transporter is located when a request is received, their time to reach a patient who needs to be transported can be determined. This allows assignments to be made more effectively, reducing patient waiting. 4 - Zone Based Dynamic Facility Layout Problem Sadan Kulturel-Konak, Professor, Pennsylvania State University, Berks Campus, Reading, PA, 19609, United States of America, sadan@psu.edu In this study, a zone-based Dynamic Facility Layout Problem (DFLP) is under consideration to design manufacturing and logistics facilities considering material handling infrastructure. A hybrid approach is proposed to solve the problem and promising numerical results are presented for a comprehensive set of test problems from the literature. Institute, 110 Eighth Street, Troy, NY, 12180, United States of America, pazouj@rpi.edu

Ricardo Giesen, Assistant Professor, Pontificia Universidad Catolica de Chile, Vicuna Mackenna 4860, Macul, Santiago, Chile, giesen@ing.puc.cl, Emilio Nacelle, Leandro Segura, Matías Estrada, Antonio Mauttone

We study the influence of real-time information services over the performance of bus transit systems from the users’ perspective. Six variants of passenger behavior models representing different degrees of information availability are proposed and embedded into a simulation framework. We perform a comprehensive set of experiments, using a small city. The impact of different assumptions concerning information availability is analyzed in terms of user travel time.

SC70 70-Room 202A, CC RAS Roundtable: Part I Railroad Operations

Efficiency and Recovery Sponsor: Railway Applications Sponsored Session

Chair: Erick Wikum, Principal Scientist, Tata Consultancy Services, 1000 Summit Drive, Milford, OH, 45150, United States of America, erick.wikum@tcs.com

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