Informs 2015

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INFORMS Philadelphia – 2015
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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,
, 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.
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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,
1 - Distribution Operations with Item Location Uncertainty
Jennifer Pazour, Assistant Professor, Rensselaer Polytechnic
Institute, 110 Eighth Street, Troy, NY, 12180,
United States of America,
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,
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, 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,
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.
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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,
1 - Railroad Operations Efficiency and Recovery
Erick Wikum, Principal Scientist, Tata Consultancy Services,
1000 Summit Drive, Milford, OH, 45150, United States of
America, 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.
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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,
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,
, 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,
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, 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
Ricardo Giesen, Assistant Professor, Pontificia Universidad
Catolica de Chile, Vicuna Mackenna 4860, Macul, Santiago,
Chile, , 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.
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