Grado Department of Industrial and Systems Engineering
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The ISE Department at Virginia Tech advances the discipline and imparts knowledge to students, peers and practitioners. In an environment that fosters leadership, achievement, and diversity, we: Prepare undergraduate and graduate students for lifelong success and leadership in the profession, in industry, and in higher education; Conduct and disseminate research that advances knowledge and promotes the economic prosperity and wellbeing of Virginia, the nation, and the world; and Provide valuable services to industry, society, and the ISE profession.
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Development of a new standard laboratory protocol for estimating the field attenuation of hearing protection devices. I. Research of Working Group 11, Accredited Standards Committee S12, noise
(Acoustical Society of America, 19960301)This paper describes research conducted by Working Group 11 of Accredited Standards Committee S12, Noise, to develop procedures to estimate the field performance of hearing protection devices (HPDs). Current standardized ... 
Development of a new standard laboratory protocol for estimating the field attenuation of hearing protection devices. Part III. the validity of using subjectfit data
(Acoustical Society of America, 19980201)The mandate of ASA Working Group S12/WG11 has been to develop "laboratory and/or field procedure(s) that yield useful estimates of field performance" of hearing protection devices (HPDs). A realear attenuation at threshold ... 
The effect of burst duration, interstimulus onset interval, and loudspeaker arrangement on auditory apparent motion in the free field
(Acoustical Society of America, 19941201)The illusion of auditory apparent motion (AAM) was examined in order to determine the burst durations and interstimulus onset intervals (ISOIs) at which AAM is heard when spatial information regarding source location was ... 
Applying variance reduction ideas in queuing simulations
(Cambridge University Press, 2001)Variance reduction techniques are often underused in simulation studies. In this article, we indicate how certain ones can be efficiently employed when analyzing queuing models. The first technique considered is that of ... 
Development of an individualbased model for polioviruses: implications of the selection of network type and outcome metrics
(Cambridge University Press, 20110601)We developed an individualbased (IB) model to explore the stochastic attributes of state transitions, the heterogeneity of the individual interactions, and the impact of different network structure choices on the poliovirus ... 
Intractability results in discreteevent simulation
(EDP SCIENCES, 1995)Simulation is often viewed as a modeling methodology of last resort. This is due to the lack of automated algorithms and procedures that exist to aid in the construction and analysis of simulation models. Jacobson and ... 
Solutions and optimality criteria to box constrained nonconvex minimization problems
(American Institute of Mathematical Sciences, 20070501)The design of elastic structures to optimize strength and economy of materials is a fundamental problem in structural engineering and related areas of applied mathematics. In this article we explore a finite dimensional ... 
Determination Of Unit Costs For Library Services
(ACRL Publications, 19790501)As with other public service activities, inflationary trends and public opinion provide a clear mandate for attempts to control the increasing costs of providing library services. Cost control necessarily requires knowledge ... 
An Effective Deflected Subgradient Optimization Scheme for Implementing Column Generation for LargeScale Airline Crew Scheduling Problems
(INFORMS, 2008)We present a new deflected subgradient scheme for generating good quality dual solutions for linear programming (LP) problems and utilize this within the context of largescale airline crew planning problems that arise ... 
An Algorithm for Fast Generation of Bivariate Poisson Random Vectors
(INFORMS, 2010)We present the "trivariate reduction extension" (TREx)an exact algorithm for the fast generation of bivariate Poisson random vectors. Like the normaltoanything (NORTA) procedure, TREx has two phases: a preprocessing ... 
Enhanced model representations for an intraring synchronous optical network design problem allowing demand splitting
(INFORMS, 2000)In this paper, we consider a network design problem arising in the context of deploying synchronous optical networks (SONET) using a unidirectional path switched ring architecture, a standard of transmission using optical ... 
Enhancing Lagrangian dual optimization for linear programs by obviating nondifferentiability
(INFORMS, 2007)We consider non differentiable optimization problems that arise when solving Lagrangian duals of largescale linear programs. Different from traditional subgradientbased approaches, we design two new methods that attempt ... 
An Optimal Constrained Pruning Strategy for Decision Trees
(INFORMS, 2009)This paper is concerned with the optimal constrained pruning of decision trees. We present a novel 01 programming model for pruning the tree to minimize some general penalty function based on the resulting leaf nodes, and ... 
Integrated Airline Schedule Design and Fleet Assignment: Polyhedral Analysis and Benders' Decomposition Approach
(INFORMS, 2010)The main airline operations consist of schedule planning, fleet assignment, aircraft routing, and crew scheduling. To improve profitability, we present in this paper an integrated fleet assignment model with schedule ... 
The Nested Event Tree Model with Application to Combating Terrorism
(INFORMS, 2010)In this paper, we model and solve the strategic problem of minimizing the expected loss inflicted by a hostile terrorist organization. An appropriate allocation of certain capabilityrelated, intentrelated, vulnerabilityrelated, ... 
Information theory and the finitetime behavior of the simulated annealing algorithm: Experimental results
(INFORMS, 1999)This article presents an empirical approach that demonstrates a theoretical connection between (information theoretic) entropy measures and the finitetime performance of the simulated annealing algorithm. The methodology ... 
The Pht/Pht/infinity queueing system: Part I  the single node
(INFORMS, 2004)We develop a numerically exact method for evaluating the timedependent mean, variance, and higherorder moments of the number of entities in a Pht/Pht/infinity queueing system. We also develop a numerically exact method ... 
The Pht/Pht/infinity (k) 100 (K) queueing system: Part II  the multiclass network
(INFORMS, 2004)We demonstrate a numerically exact method for evaluating the timedependent mean, variance, and higherorder moments of the number of entities in the multiclass [Pht/Pht/infinity](K) queueing network system, as well as ... 
CNORTA: A Rejection Procedure for Sampling from the Tail of Bivariate NORTA Distributions
(INFORMS, 2012)We propose CNORTA, an exact algorithm to generate random variates from the tail of a bivariate NORTA random vector. (A NORTA random vector is specified by a pair of marginals and a rank or productmoment correlation, and ... 
Fitting the Pht/Mt/s/c TimeDependent Departure Process for Use in Tandem Queueing Networks
(INFORMS, 2013)This paper considers timedependent Pht/Mt/s/c queueing nodes and small tandem networks of such nodes. We examine characteristics of the departure processes from a multiserver queueing node; in particular, we focus on ...