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作者：Levi, Retsef; Perakis, Georgia; Uichanco, Joline
作者单位：Massachusetts Institute of Technology (MIT); University of Michigan System; University of Michigan
摘要：Consider the newsvendor model, but under the assumption that the underlying demand distribution is not known as part of the input. Instead, the only information available is a random, independent sample drawn from the demand distribution. This paper analyzes the sample average approximation (SAA) approach for the data-driven newsvendor problem. We obtain a new analytical bound on the probability that the relative regret of the SAA solution exceeds a threshold. This bound is significantly tight...
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作者：Qu, Huashuai; Ryzhov, Ilya O.; Fu, Michael C.; Ding, Zi
作者单位：University System of Maryland; University of Maryland College Park; University System of Maryland; University of Maryland College Park
摘要：We create the first computationally tractable Bayesian statistical model for learning unknown correlation structures in fully sequential simulation selection. Correlations represent similarities or differences between various design alternatives and can be exploited to extract much more information from each individual simulation. However, in most applications, the correlation structure is unknown, thus creating the additional challenge of simultaneously learning unknown mean performance value...
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作者：Dong, Jing; Feldman, Pnina; Yom-Tov, Galit B.
作者单位：Northwestern University; University of California System; University of California Berkeley; Technion Israel Institute of Technology
摘要：Many service systems exhibit service slowdowns when the system is congested. Our goal in this paper is to investigate this phenomenon and its effect on system performance. We modify the Erlang-A model to account for service slowdowns and carry out the performance analysis in the quality-and efficiencydriven (QED) regime. We find that when the load sensitivity is low, the system can achieve QED performance, but the square-root staffing parameter requires an adjustment to achieve the same perfor...
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作者：Aravindakshan, Ashwin; Naik, Prasad A.
作者单位：University of California System; University of California Davis
摘要：Extant models assume that awareness decline commences instantly. In contrast, we incorporate the possibility that awareness declines with a delay due to the memory for advertisements. To this end, we use delay differential equations to understand the evolution of awareness in the presence of ad memorability. This extended model generates optimal advertising policies that include the even spending policy, blitz policy, and various cyclic pulsing policies, depending on whether ad memorability ex...
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作者：Chen, Lucy Gongtao; Robinson, Lawrence W.; Roundy, Robin O.; Zhang, Rachel Q.
作者单位：National University of Singapore; Cornell University; Brigham Young University; Hong Kong University of Science & Technology
摘要：In today's business environment, unpredictable economic and noneconomic forces can affect firms' operational costs and discount factors, as well as demand. In this paper, we incorporate these uncertainties into a single-product, periodic-review, finite-horizon stochastic inventory system by modeling operational costs, discount factors, and demands as stochastic processes that evolve over time. We study three stockout protocols and establish conditions under which (s, S) inventory policies are ...
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作者：Cominetti, Roberto; Correa, Jose; Larre, Omar
作者单位：Universidad de Chile
摘要：Flows over time provide a natural and convenient description for the dynamics of a continuous stream of particles traveling from a source to a sink in a network, allowing to track the progress of each infinitesimal particle along time. A basic model for the propagation of flow is the so-called fluid queue model in which the time to traverse an edge is composed of a flow-dependent waiting time in a queue at the entrance of the edge plus a constant travel time after leaving the queue. In a dynam...
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作者：Siebert, Johannes; Keeney, Ralph L.
作者单位：University of Bayreuth; Duke University
摘要：The quality of alternatives is crucial for making good decisions. This research, based on five empirical studies of important personally relevant decisions, examines the ability of decision makers to create alternatives for their important decisions and the effectiveness of different stimuli for improving this ability. For decisions for which the full set of potentially desirable alternatives is not readily apparent, our first study indicates that decision makers identify less than half of the...
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作者：Chao, Xiuli; Gong, Xiting; Shi, Cong; Zhang, Huanan
作者单位：University of Michigan System; University of Michigan; Chinese University of Hong Kong
摘要：We develop the first approximation algorithms with worst-case performance guarantees for periodic-review perishable inventory systems with general product lifetime, for both backlogging and lost-sales models. The demand process can be nonstationary and correlated over time, capturing such features as demand seasonality and forecast updates. The optimal control policy for such systems is notoriously complicated, thus finding effective heuristic policies is of practical importance. In this paper...
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作者：Prekopa, Andras; Unuvar, Merve
作者单位：Rutgers University System; Rutgers University New Brunswick; International Business Machines (IBM); IBM USA
摘要：Single commodity networks are considered, where demands at the nodes are random. The problem is to find minimum cost optimal built in capacities at the nodes and arcs subject to the constraint that all demands should be met on a prescribed probability level (reliability constraint) and some deterministic constraints should be satisfied. The reliability constraint is formulated in terms of the Gale-Hoffman feasibility inequalities, but their number is reduced by elimination technique. The conce...
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作者：Luo, Wei; Shang, Kevin
作者单位：University of Navarra; IESE Business School; Duke University
摘要：This paper develops a centralized supply chain model that integrates material flows with cash flows. The supply chain is owned by a single firm with two divisions. The downstream division (headquarters), facing random customer demand, replenishes materials from the upstream division. The firm installs a financial services platform that pools the divisions' cash into a master account managed by the headquarters. In each period, cash is received from customers and paid to the outside vendor afte...
