Operations Research

最新文章

• Measuring Eco-Inefficiency: A New Frontier Approach AI翻译
  作者：Chen, Chien-Ming; Delmas, Magali A.
  作者单位：Nanyang Technological University; University of California System; University of California Los Angeles; University of California System; University of California Los Angeles
  摘要：Growing social concerns over the environmental externalities associated with business activities are pushing firms to identify activities that create economic value with less environmental impact and to become more eco-efficient. Over the past two decades, researchers have increasingly used frontier efficiency models to evaluate productive efficiency in the presence of undesirable outputs, such as greenhouse gas emissions or toxic emissions. In this paper, we identify critical flaws in existin...
• Design and Operations of Gas Transmission Networks AI翻译
  作者：Babonneau, Frederic; Nesterov, Yurii; Vial, Jean-Philippe
  作者单位：Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Universite Catholique Louvain
  摘要：Problems dealing with the design and operations of gas transmission networks are challenging. The standard approaches lead to a difficult nonlinear nonconvex optimization problem. To get around this difficulty, we use a minimum energy principle to define stationary flows in the network. This solution minimizes the total energy dissipated in the system. We extend the minimization process to the choice of suitable diameters on the reinforcing arcs and add a constraint that limits the monetary co...
• Consistency of Multidimensional Convex Regression AI翻译
  作者：Lim, Eunji; Glynn, Peter W.
  作者单位：University of Miami; Stanford University
  摘要：Convex regression is concerned with computing the best fit of a convex function to a data set of n observations in which the independent variable is (possibly) multidimensional. Such regression problems arise in operations research, economics, and other disciplines in which imposing a convexity constraint on the regression function is natural. This paper studies a least-squares estimator that is computable as the solution of a quadratic program and establishes that it converges almost surely t...
• Optimizing Intensive Care Unit Discharge Decisions with Patient Readmissions AI翻译
  作者：Chan, Carri W.; Farias, Vivek F.; Bambos, Nicholas; Escobar, Gabriel J.
  作者单位：Columbia University; Massachusetts Institute of Technology (MIT); Stanford University; Stanford University; Kaiser Permanente
  摘要：This work examines the impact of discharge decisions under uncertainty in a capacity-constrained high-risk setting: the intensive care unit (ICU). New arrivals to an ICU are typically very high-priority patients and, should the ICU be full upon their arrival, discharging a patient currently residing in the ICU may be required to accommodate a newly admitted patient. Patients so discharged risk physiologic deterioration, which might ultimately require readmission; models of these risks are curr...
• An Overloaded Multiclass FIFO Queue with Abandonments AI翻译
  作者：Jennings, Otis B.; Reed, Josh E.
  作者单位：Columbia University; New York University
  摘要：In this paper we consider a single-server queue fed by K independent renewal arrival streams, each representing a different job class. Jobs are processed in a FIFO fashion, regardless of class. The total amount of work arriving to the system exceeds the server's capacity. That is, the nominal traffic intensity of the system is assumed to be greater than one. Jobs arriving to the system grow impatient and abandon the queue after a random amount of time if service has not yet begun. Interarrival...
• Solving an Infinite Horizon Adverse Selection Model Through Finite Policy Graphs AI翻译
  作者：Zhang, Hao
  作者单位：University of Southern California
  摘要：This paper studies an infinite horizon adverse selection model with an underlying Markov information process. It introduces a graphic representation of continuation contracts and continuation payoff frontiers, namely finite policy graph, and provides an algorithm to approximate the optimal policy graph through iterations. The algorithm performs an additional step after each value iteration-replacing dominated points on the previous continuation payoff frontier by points on the new frontier and...
• A New Algorithm for the Open-Pit Mine Production Scheduling Problem AI翻译
  作者：Chicoisne, Renaud; Espinoza, Daniel; Goycoolea, Marcos; Moreno, Eduardo; Rubio, Enrique
  作者单位：Universidad de Chile; Universidad Adolfo Ibanez; Universidad Adolfo Ibanez; Universidad de Chile; Universidad de Chile
  摘要：For the purpose of production scheduling, open-pit mines are discretized into three-dimensional arrays known as block models. Production scheduling consists of deciding which blocks should be extracted, when they should be extracted, and what to do with the blocks once they are extracted. Blocks that are close to the surface should be extracted first, and capacity constraints limit the production in each time period. Since the 1960s, it has been known that this problem can be cast as an intege...
• Reliable Traffic Sensor Deployment Under Probabilistic Disruptions and Generalized Surveillance Effectiveness Measures AI翻译
  作者：Li, Xiaopeng; Ouyang, Yanfeng
  作者单位：Mississippi State University; University of Illinois System; University of Illinois Urbana-Champaign
  摘要：Sensor systems as critical components of a transportation network provide a variety of real-time traffic surveillance information for traffic management and control. The deployment of sensors significantly affects their overall surveillance effectiveness. This paper proposes a reliable sensor location model to optimize surveillance effectiveness when sensors are subject to site-dependent probabilistic failures, and a general effectiveness measure is proposed to encompass most existing measures...
• Ordering Policies for Periodic-Review Inventory Systems with Quantity-Dependent Fixed Costs AI翻译
  作者：Caliskan-Demirag, Ozgun; Chen, Youhua (Frank); Yang, Yi
  作者单位：Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; City University of Hong Kong; Zhejiang University
  摘要：We consider a stochastic periodic-review inventory control system in which the fixed cost depends on the order quantity. In particular, we investigate the optimal ordering policies under three fixed cost structures. The first structure is motivated by transportation and production contracts and considers two fixed costs: if the order size is within a specified limit C, then the fixed cost is K-1; otherwise, it is K-2, where K-1 <= K-2. The second structure contains multiple fixed costs in whic...
• The Planning of Guaranteed Targeted Display Advertising AI翻译
  作者：Turner, John
  作者单位：University of California System; University of California Irvine
  摘要：As targeted advertising becomes prevalent in a wide variety of media vehicles, planning models become increasingly important to ad networks that need to match ads to appropriate audience segments, provide a high quality of service (meet advertisers' goals), and ensure that ad serving opportunities are not wasted. We define Guaranteed Targeted Display Advertising (GTDA) as a class of media vehicles that include webpage banner ads, video games, electronic outdoor billboards, and the next generat...