Informs 2015

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INFORMS Philadelphia – 2015
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3 - Decomposition Algorithm for Two-stage Stochastic Integer
Programs with Deviation Risk Measures
Saravanan Venkatachalam, Texas A&M University,
3131 TAMU, College Station TX 77843
Lewis Ntaimo, Bernardo Pagnoncelli
In this talk, we present a decomposition algorithm for two-stage stochastic integer
programs (SIP) with absolute semi-deviation (ASD) risk measures. These types of
problems are hard to decompose due to the lack of amenable problem structure.
We propose a methodology that uses the information from expected excess risk
measure to solve SIPs with ASD risk measures. Preliminary computational results
will be presented.
WA14
14-Franklin 4, Marriott
Advances in Information Modeling
Sponsor: Optimization/Optimization Under Uncertainty
Sponsored Session
Chair: Eugene Perevalov, Lehigh University, 200 W Packer Ave,
Bethlehem, PA, United States of America,
1 - Information Sources’ Knowledge Structure, Question/Answer
Depth and Information Relevance
Eugene Perevalov, Lehigh University, 200 W Packer Ave,
Bethlehem, PA, United States of America,
Xing Wang
To optimize the process of information acquisition, a problem solving agent
analyzes both the available information and the information relevant to the given
problem, and, based on such analysis, selects the information source(s) that can
help obtain the largest improvement of the solution quality. Currently, this is
done on a largely ad hoc case-by-case basis. Our goal is to develop a general
theory providing a regular way of performing such a selection.
2 - Towards the Full Information Theory: Knowledge Structure of
Information Sources
Xing Wang, Lehigh University, 200 W Packer Ave, Bethlehem,
PA, United States of America,
Eugene Perevalov
The classical Information Theory was able to properly describe the sheer quantity
of information which allowed for optimization of information transmission
leaving the process of information acquisition still in the “pre-theoretical” state
relying on ad-hoc approaches. We initiate the study of the latter which makes it
necessary to describe the ability of information sources to change the agent’s
information state depending on the specific information requested.
3 - Using Network Diversity in Analytics and Visualization
Seifu Chonde, Student, The Pennsylvania State University,
311 Leonhard Building, University Park, PA, 16802,
United States of America, , Soundar Kumara
In 2007, the Rao-Stirling diversity framework was introduced to capture changes
in the variety, balance, and disparity among nodes in networks. We extended this
diversity measure to include coherence, which captures network density. We
show how our diversity measure improves approaches in clustering, link
prediction, and tracking evolutionary networks. We use a case study in drug
design with hundreds of thousands of journal articles to motivate the study of
diversity.
WA15
15-Franklin 5, Marriott
Monitoring and Prevention of Hospital
Acquired Infections
Sponsor: Optimization in Healthcare
Sponsored Session
Chair: Eduardo Pérez, Assistant Professor, Texas State University,
601 University Drive Ingram School of Eng, San Marcos, TX, 78666,
United States of America,
1 - Network Effects on Hand-hygiene Behavior
Reidar Hagtvedt, University of Alberta, Edmonton, AB, Canada,
Brian Whiteside,
Bruce Wright, Sarah Forgie
Hand-hygiene in healthcare settings is a phenomenon that has been studied a
great deal, both on the individual and on the group level, but to our knowledge
detail on the group working as a network in this context has not been studied.
We use sociometric badges to gather data from a large teaching hospital and
estimate network statistics. We then model the relationship between the network
and individual behaviors.
2 - Agent-Based Mediation Modeling of a Controlled Trial to Reduce
Transmission of Resistant Organisms
Sean Barnes, University of Maryland, 4352 Van Munching Hall,
University of Maryland, College Park, MD, 20742, United States
of America, , Daniel Morgan,
Lisa Pineles, Anthony Harris
In 2012-2013, the University of Maryland School of Medicine led a 20-site trial to
assess the benefits of universal gloves and gowns in reducing the transmission of
multidrug-resistant organisms in acute-care hospitals. We develop an agent-based
model to simulate transmission in an ICU, and calibrate this model to best match
the outcomes from the 20 sites. Then, we validate the model against the study’s
analysis, and perform a factorial design to quantify the direct benefit of this
intervention.
3 - A Systems Approach to Reducing Central Line Associated Blood
Stream Infections
Eva Lee, Georgia Institute of Technology,
The study aims to reduce central line associated bloodstream infections (CLABSI)
at Grady Hospital by 20% from current levels. A systems model is designed that
comprises the entire process of central line insertion and maintenance. Hospital
data is analyzed to identify potential increased risk of CLABSI-related deaths. An
second objective includes predicting death among CLASBI-infected patients while
minimizing Type II errors; enabling providers to intervene early to reduce
unnecessary deaths.
4 - Assessing CAUTI Prevention Interventions in Intensive Care Units
Eduardo Pérez, Assistant Professor, Texas State University, 601
University Drive Ingram School of En, San Marcos, TX, 78666,
United States of America,
This research extend the current methods for addressing CAUTIs to a new level
beyond the current state of practice by introducing a new simulation model for
system assessment and determination of the clinical efficacy and effectiveness of
CAUTI preventive interventions. The simulation model provide a platform where
specific interventions can be computed and analyzed, giving an idea on possible
expectations of the intervention before clinical research is conducted.
WA16
16-Franklin 6, Marriott
Game Theory II
Contributed Session
Chair: Chuangyin Dang, Professor, City University of Hong Kong,
Dept. of SEEM, 83 Tat Chee Avenue, Kowloon, Hong Kong - PRC,
1 - Royalty Licensing Mechanisms in a Leadership Structure
Masashi Umezawa, Professor, Tokyo Univesity of Science, School
of Management, 500 Shimokiyoku, Kuki, Saitama, 346-8512,
Japan,
This paper studies a patent licensing of a cost-reducing innovation which is
developed by an internal patentee, one of the firms of the industry. Royalty
licensing is mainly focused. Most patent licensing contracts observed empirically
include either per-unit or ad valorem royalties. We consider that in a Stackelberg
duopoly which types of royalty the patentee prefers. Moreover, we examine the
effect of royalty licensing from the point of consumers and social welfare.
2 - Horizontal Product Differentiation in the Presence of
Core Products
Hiroki Kishihara, Keio University, Hiyoshi 3-14-1 Kohoku-ku,
Yokohama, Japan, , Nobuo Matsubayashi
We study horizontal product differentiation between two firms by a game-
theoretic approach. We suppose that to introduce their new products, firms must
incur ``repositioning cost” which increases with the position difference from their
core products exogenously given in a product space. We show that the presence
of repositioning costs can have a significant impact on the equilibrium outcomes,
which also depends on their cost structures.
3 - A General Method for Checking the Core Emptiness of Traveling
Salesman Games
Lei Sun, Development Specialist, Praxair Inc., 175 E. Park Dr.,
Tonawanda, NY, 14150, United States of America,
, Mark Karwan
We study the core of traveling salesman games from an optimization perspective
and propose a new variant of the traveling salesman problem building a link
between the two problems. An exact formula is found to measure the gap
between the best achievable cost allocation and the core. With network
optimization models and algorithms, we develop an implementable method to
check whether an empty core exists in general for both symmetric and
asymmetric traveling salesman games.
WA14