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作者：Stuart, JA; Ammons, JC; Turbini, LJ
作者单位：University System of Ohio; Ohio State University; University System of Georgia; Georgia Institute of Technology
摘要：Introduction of product designs and process innovation requires a company to evaluate complex cost and environmental tradeoffs. In the past, these have not included environmental costs. This paper describes the first known analytical approach to capture comprehensively measurable corporate environmental impact considerations for the product life cycle. A mixed integer programming model is developed to select product and process alternatives while considering tradeoffs of yield, reliability, an...
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作者：Ahmadi, R; Wang, RH
作者单位：University of California System; University of California Los Angeles
摘要：Product development has become the focal point of industrial competition and is the cornerstone of long-term survival for most firms. One of the major management challenges in product development is to deal with development risk in the design process. In this paper we provide a strategic guideline as to how the design process should be managed and controlled. We describe how design reviews and engineering resources can be scheduled as the control mechanisms to operationally manage development ...
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作者：Gamache, M; Soumis, F; Marquis, G; Desrosiers, J
作者单位：Universite de Montreal; Universite de Montreal; Polytechnique Montreal; Universite de Montreal; HEC Montreal
摘要：This article describes a method for solving the crew rostering problem in air transportation. This problem consists of constructing personalized schedules that assign pairings, days off, and other activities to airline crew members. A generalized set partitioning model and a method using column generation have been used. This method has been adapted in a number of ways to take advantage of the nature of the problem and to accelerate solution. Numerical tests on problems from Air France have de...
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作者：Xu, SH
作者单位：Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park
摘要：In assemble-to-order production systems, and others of a similar flavor, it is often the case that orders for components of various types are placed simultaneously, but that these components are manufactured or assembled at separate facilities. The order process introduces correlation among the jobs at separate facilities. The purpose of this paper is to study the effect of this correlation on a variety of system performance measures. Consider a system that consists of s parallel servers, wher...
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作者：Hsu, A; Bassok, Y
作者单位：Carnegie Mellon University; University of Washington; University of Washington Seattle
摘要：In this paper, we present and solve a single-period, multiproduct, downward substitution model. Our model has one raw material as the production input and produces N different products as outputs. The demands and yields for the products are random. We determine the optimal production input and allocation of the N products to satisfy demands. The problem is modeled as a two-stage stochastic program, which we show can be decomposed into a parameterized network flow problem. We present and compar...
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作者：Sokkalingam, PT; Ahuja, RK; Orlin, JB
作者单位：Cisco Systems Inc; Cisco India; State University System of Florida; University of Florida; Massachusetts Institute of Technology (MIT)
摘要：Given a solution x* and an a priori estimated cost vector c, the inverse optimization problem is to identify another cost vector d so that x* is optimal with respect to the cost vector d and its deviation from c is minimum. In this paper, we consider the inverse spanning tree problem on an undirected graph G = (N, A) with n nodes and m arcs, and where the deviation between c and d is defined by the rectilinear distance between the two vectors, that is, L-1 norm. We show that the inverse spanni...
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作者：Goldsman, D; Kang, KB; Seila, AF
作者单位：University System of Georgia; Georgia Institute of Technology; United States Department of Defense; United States Navy; Naval Postgraduate School; University System of Georgia; University of Georgia
摘要：We study estimators for the variance parameter sigma(2) of a stationary process. The estimators are based on weighted Cramer-von Mises statistics, and certain weightings yield estimators that are first-order unbiased for sigma(2). We derive an expression for the asymptotic variance of the new estimators; this expression is then used to obtain the first-order unbiased estimator having the smallest variance among fu;ed-degree polynomial weighting functions. Our work is based on asymptotic theory...
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作者：Kitaev, MY; Serfozo, RF
作者单位：Lomonosov Moscow State University; University System of Georgia; Georgia Institute of Technology
摘要：This paper considers an M/M/1 queueing system with dynamically controlled arrival and service rates. At each arrival or service completion epoch, a decision maker chooses a pair of arrival and service rates from a finite set, and the system operates under these rates until the next arrival or service completion. There is a switching cost for changing the rates, and there is a cost per unit time of holding customers and using the arrival and service rates. The results describe natural condition...
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作者：Greiner, M; Jobmann, M; Lipsky, L
作者单位：Technical University of Munich; University of Connecticut
摘要：Power-tail distributions are those for which the reliability function is of the form x(-alpha) for large x. Although they look well behaved, they have the singular property that E(X-l) = infinity for all l greater than or equal to alpha. Thus it is possible to have a distribution with an infinite variance, or even an infinite mean. As pathological as these distributions seem to be, they occur everywhere in nature, from the CPU time used by jobs on main-frame computers to sizes of files stored ...
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作者：Dial, RB
摘要：The conclusion of a two-part series, this paper devises an algorithm that finds a system of optimal tolls in a road network whose trips have a stochastic value of time. As formulated in Part I, the model is a variational inequality, equivalent to a specialized bicriterion equilibrium traffic assignment whose solution reflects a traffic how simultaneously user- and system-optimal. To compute these optimal tolls, our algorithm uses restricted simplicial decomposition. It solves the subproblem (d...
