Informs 2015

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INFORMS Philadelphia – 2015
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4 - Modeling Individual Consumer Food Contamination Progession
Jessye Bemley, North Carolina A&T State Uinversity,
1601 East Market St., McNair Hall 419, Greensboro, NC, 27409,
United States of America, , Lauren Davis
Food-borne illness affects nearly 48 million individuals a year resulting in
hospitalizations and deaths. United States public health departments reported that
1,527 food outbreaks occurred between 2009 and 2010 of which 7.8% resulted in
deaths. The purpose of this research is to develop models that will help to
quantify consumer morbidity, consider the impact of various characteristics on
the consumer, spread of contamination and consider interventions.
WE38
38-Room 415, Marriott
Optimization Combinatorial IV
Contributed Session
Chair: Mohsen Momeni Tabar, K.N.Toosi University of Technology,
Tehran, Iran,
1 - Semidefinite and Copositive Relaxation of Polynomial
Optimization by using Symmetric Tensors
Xiaolong Kuang, Lehigh University, 14 Duh Drive, Apt. 324,
Bethlehem, PA, 18015, United States of America,
We study relaxation of general polynomial optimization problem over the cone of
positive semidefinite and completely positive tensors, which are natural
extensions of the cones of positive semidefinite and completely positive matrices.
Then we characterize the relationship between Lagrangian bounds, semidefinite
bounds and copositive bounds of polynomial optimization.
2 - A Three-Operator Splitting Scheme and its
Optimization Applications
Damek Davis, Graduate Student, University of California, Los
Angeles, Department of Mathematics, Los Angeles, CA,
90095-1555, United States of America, ,
Wotao Yin
In this talk, we introduce a new splitting scheme that extends the Douglas-
Rachford and forward-backward splitting schemes to monotone inclusions with
three operators, one of which is cocoercive. We discuss why this algorithm works,
derive several special cases, including a simple three-block ADMM algorithm, and
introduce an acceleration that achieves the optimal rate of convergence for
strongly monotone inclusions. Finally, we discuss several applications and future
research directions.
3 - Moment Problem and its Applications to Risk Assessment
Ruilin Tian, Associate Professor Of Finance, North Dakota State
University, 244 Richard H. Barry Hall, NDSU Dept 2410, Fargo,
ND, 58108-6050, United States of America,
Samuel Cox, Luis Zuluaga
We discuss how to solve univariate moment problems with different function
forms for risk assessment through three methods; namely, the semidefinite
programming method, the moment-matching method, and a linear
approximation method. We show that for practical purposes, these methods
provide numerically equivalent results. Also, we propose a simpler formulation
for the unimodal bounds on E[I_(x<=K]] compared to existing formulations of
the moment problem in the literature.
4 - Calculating the Number of Optimal Server in Queue M/M/s/K
Mohsen Momeni Tabar, K.N.Toosi University of Technology,
Tehran, Iran, Zhila Dehdari Ebrahimi,
Mahyar Ejlali
Nowadays, economical systems play an important role in reducing costs. In this
paper, mathematical modeling and calculation of optimal server queue M / M / s /
K have been investigated and numerical analysis method was used. The goal of
this paper, base on two criteria to minimize costs and maximize the level of
service is built. Finally, analyzed this paper done by maple 12 software.
WE39
39-Room 100, CC
Supply Disruption, Price Competition, and Quality
Cluster: Operations/Marketing Interface
Invited Session
Chair: Chao Liang, Assistant Professor, Cheung Kong Graduate School
of Business, Main Campus, Oriental Plaza, E2, 1 East Chang An Ave,
Beijing, China,
1 - Impact of Variety Seeking Behavior on Service Competition under
Price Commitment
Ying Wei, Associate Professor, Jinan University, Rm 722, Huiquan
Building, Huangpu Avenue West 601#, Tianhe Dist., Guangzhou,
510632, China, Liyang Xiong, Yulan Wang
Variety seeking is modeled as a decrease in the willingness to pay for the product
purchased on the previous purchase occasion. With a two-stage Hotelling-type
model, we show that under symmetric competition, the presence of variety
seeking induces centralization effect, meaning firms tend to make the same price
and service levels; while under asymmetric competiton, the presence of variety
seeking induces polarization effect meaning firms’ price and service decisions tend
to be different.
2 - Uniform Pricing in Service Systems as an Efficient Way of
Improving Quality
Xin Geng, Sauder School of Business, University of British
Columbia, Vancouver, BC,
We look at a firm with heterogeneous servers who provide quality-differentiated
services, where quality can be improved based on servers’ experience. The
commonly used pricing scheme that posts a price on each server suffers from a
pitfall that the low quality servers usually improve slowly, impeding the future
revenue increase. To resolve this issue, we propose another pricing scheme, which
is essentially probabilistic selling, and analytically establish its superiority in long-
run revenue.
3 - Does Traceability Help Product Quality?
Chao Liang, Assistant Professor, Cheung Kong Graduate School of
Business, Main Campus, Oriental Plaza, E2, 1 East Chang An Ave,
Beijing, China,
In a supply chain with one manufacturer and one supplier, we study how
traceability impacts the manufacturer and the supplier’s incentive to improve
product quality. Interestingly, we find that traceability may reduce the final
product’s quality.
WE40
40- Room 101, CC
Operations Management/Marketing Interface IV
Contributed Session
Chair: Sung Wook Yun, Yonsei University, Sinchon-dong,
Seodaemun-gu, Seoul, Korea, Republic of,
1 - Product Differentiation under Uncertain Market Conditions
Xingxing Chen, Washington University in St. Louis, Campus Box
1133, St. Louis, MO, 63130, United States of America,
We study a competition model between two firms facing uncertain market
conditions where they engage in a product design competition with these
uncertainties and then engage in a price competition after uncertainties are
resolved. We try to characterize price and product design equilibrium and see
how uncertainties in the market affect the equilibrium outcome.
2 - The Antecedents and Consequences of Automotive Recall
Decision Making
Chelsey Hill-Esler, Drexel University, 730 Gerri LeBow Hall, 3220
Market Street, Philadelphia, PA, 19104, United States of America,
Chaojiang Wu
In the automotive industry, when a safety defect or noncompliance issue is
discovered, automakers must make many important decisions. This research
considers two decisions: action and initiation. Using primary and secondary recall
data between 2004-2014, the authors utilize a two-stage modeling approach
investigating the factors influencing recalls and the effect of recall decisions on
market share.
WE40