2016 INFORMS Annual Meeting Program

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INFORMS Nashville – 2016
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2 - Improving Supplier Compliance Through Joint And Shared Audits
With Collective Penalty
Prashant Chintapalli, UCLA, Los Angeles, CA, United States,
Felipe Caro,
Kumar Rajaram, Christopher S Tang
Motivated by the Accord on Fire and Building Safety in Bangladesh we study the
effectiveness of buyer consortiums in supply chains . Using a game-theoretic
model, we show that while a consortium improves supplier compliance and
buyers’ profits, it puts supplier at a disadvantage. We identify a few sufficient
conditions for the existence of a Pareto improving transfer-payment mechanism
that a buyer consortium can offer the supplier.
3 - Testing By Competitors In Enforcement Of Product Standards
Terry Taylor, University of California Berkeley, Berkeley, CA,
94720, United States, , Erica Plambeck
This paper explores a novel mechanism to encourage compliance with and
identify violations of safety and environmental standards: Firms testing
competitors’ products.
WB30
202B-MCC
Management of Critical Care
Sponsored: Manufacturing & Service Oper Mgmt,
Healthcare Operations
Sponsored Session
Chair: Vedat Verter, McGill University, Montreal, QC, Canada,
Co-Chair: Michael Klein, McGill University, Montreal, QC, Canada
1 - Specialist Care In Rural Hospitals: From Emergency Department
Consultation To Inpatient Ward Discharge
Michael G. Klein, McGill University, Montreal, QC, Canada,
, Vedat Verter, Hughie F. Fraser,
Brian G. Moses
Patients often wait in the Emergency Department for admission to inpatient
wards, resulting in crowding and adverse health outcomes. In rural hospitals,
Internal Medicine Specialists (Internists) take on a dual role as ICU physician and
Internist on call. We study the workflow decisions of Internists at two hospitals in
Nova Scotia, Canada. We propose a stochastic dynamic programming model to
analyze current practice and identify strategies for improvement.
2 - Effects Of Admission And Discharge Delays On Intensive Care
Unit Patient Outcomes
Elisa Long, Assistant Professor, UCLA Anderson School of
Management, Los Angeles, CA, 90095, United States,
, Kusum Mathews
Patients admitted to the ICU often endure excessive delays for bed assignment
due to capacity shortages, and prolonged ICU boarding following receipt of care.
Using 2 years of data for 2 academic hospitals, we estimate that each hour of
admission delay increases in-hospital mortality by 4%. We also examine whether
simultaneous ICU and ward occupancy surges affect length of stay. Unlike prior
studies we find that service time (when critically ill patients are stabilized) is
unaffected by occupancy, yet ICU boarding accelerates during periods of high ICU
occupancy and slows when ward occupancy is high. We find no adverse effects of
occupancy on ICU bouncebacks or 30-day readmissions.
3 - A Delay-differential Equation Model Of An Intensive Care Unit
Eman Almehdawe, University of Regina, Regina, SK, Canada,
Armann Ingolfsson
We investigate a fluid approximation model of an intensive care unit, in which
patients are discharged at an adjustable speed, which influences the proportion of
patients that are readmitted after a delay. We formulate the model as a delay-
differential equation. We study the transient and steady-state behavior of the
system occupancy in four different regimes and we obtain conditions under
which speedup reduces average occupancy.
WB31
202C-MCC
Service Operations in a Modern Economy
Sponsored: Manufacturing & Service Oper Mgmt,
Service Operations
Sponsored Session
Chair: Serguei Netessine, INSEAD, 1 Ayer Rajah Avenue, Singapore,
138676, Singapore,
1 - Ethics, Bounded Rationality And Ip Sharing In
Knowledge-based Outsourcing
Manu Goyal, University of Utah, Salt Lake City, UT, United States,
, Krishnan S Anand
Our dynamic model of knowledge-based outsourcing integrates (i) its major
impediments— incomplete contracts, moral hazard and adverse selection, and (ii)
its major facilitators— ethics, IP sharing and reputations. We show that, under
bounded rationality, an ethical firm can obtain strictly greater profits than a
profit-maximizing firm unconstrained by ethics. We find a novel explanation,
rooted in ethics, for IP sharing, which arises as a strategic imperative even when it
lowers firms’ profits. Our results explain why (a) a commitment to ethics can
boost profits, (b) IP sharing is widespread, and (c) knowledge-based outsourcing is
booming despite several formidable impediments.
2 - Accurate Estimation Of Retail Store Traffic From People Counters
To Achieve Better Conversion
Anup Hanamant Walvekar, INSEAD,
Conversion rate is an important KPI for retail store manager that captures fraction
of sales opportunities that store was able to capture. As group of customers
seldom have multiple transactions, #groups of customers visiting the store is more
appropriate measure of sales opportunities than #customers. #Groups of
customers visiting the store is not readily available from traffic counters. In this
paper, we model the customer arrival process. We derive five different estimators
of #groups of customers using customer arrival data and analyse their
performance in different traffic profiles.
3 - Mitigating Digital Discrimination With Reviews In The Sharing
Economy: Field Evidence From Airbnb
Dennis Zhang, Kellogg School of Management,
Northwestern University, Evanston, CA, 60201, United States,
Jun Li, Ruomeng Cui
This project studies how agents may discriminate each other based on
demographic information in the sharing economies. We conduct several field
experiments on the Airbnb platform to quantify the impact of such discrimination
on the platform’s revenue and provide several recommendations to mitigate it.
4 - Impact Of Operational Risks In Financial Organizations
Yuqian Xu, New York University, 44 West 4th Street, New York,
NY, 10012, United States, , Fangyun Tan,
Serguei Netessine
We analyze extensive data from a Chinese bank which contains information on
operational risks in retail banking. We find that workload affects incidence of risks
in this service setting.
WB32
203A-MCC
Risk Analysis II
Contributed Session
Chair: David Menachof, Peter Thompson Chair in Port Logistics, The
University of Hull, Logistics Institute, Hull University Business School,
Kingston upon Hull, HU6 7RX, United Kingdom,
1 - Macroscopic Look At The Equity Market
Abdullah Alshelahi, PhD Student, University of Michigan,
2410 Leslie Circle, Ann Arbor, MI, 48105, United States,
Romesh Saigal
The aim of this research is to investigate the existence of sensors which may aid in
the monitoring of Equity Markets. While the classical approach consists of
studying the stock market following the evolution of individual stocks, we use a
so-called macroscopic viewpoint by considering a global view of the equity
markets. This way, we see the market within the context of the principles of mass
and momentum conservation and the variables such as density, pressure, average
velocity, etc. We can then define `sensors’ that can monitor some of these
variables in the market. Finally, we propose a model that predicts and provides
alerts in the case of abnormal events.
WB32