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作者：Goldengorin, Boris; Krushinsky, Dmitry; Slomp, Jannes
作者单位：HSE University (National Research University Higher School of Economics); HSE University (National Research University Higher School of Economics); University of Groningen
摘要：Lately, the problem of cell formation (CF) has gained a lot of attention in the industrial engineering literature. Since it was formulated (more than 50 years ago), the problem has incorporated additional industrial factors and constraints while its solution methods have been constantly improving in terms of the solution quality and CPU times. However, despite all the efforts made, the available solution methods (including those for a popular model based on the p-median problem, PMP) are prone...
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作者：Jacobson, Evin Uzun; Argon, Nilay Tanik; Ziya, Serhan
作者单位：Imperial College London; University of North Carolina; University of North Carolina Chapel Hill
摘要：In the aftermath of mass-casualty events, key resources (such as ambulances and operating rooms) can be overwhelmed by the sudden jump in patient demand. To ration these resources, patients are assigned different priority levels, a process that is called triage. According to triage protocols in place, each patient's priority level is determined based on that patient's injuries only. However, recent work from the emergency medicine literature suggests that when determining priorities, resource ...
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作者：Reed, Josh; Tezcan, Tolga
作者单位：New York University; University of Rochester
摘要：We Obtain a heavy traffic limit for the GI/M/n + GI queue, which includes the entire patience time distribution. Our main approach is to scale the hazard rate function of the patience time distribution in such a way that our resulting diffusion approximation contains the entire hazard rate function. We then show through numerical studies that for various performance measures, our approximations tend to outperform those commonly used in practice. The robustness of our results is also demonstrat...
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作者：Yaman, Hande; Karasan, Oya Ekin; Kara, Bahar Y.
作者单位：Ihsan Dogramaci Bilkent University
摘要：Inspired by a real-life problem faced by one of the largest ground-based cargo companies of Turkey, the current study introduces a new facet to the hub location literature. The release time scheduling and hub location problem aims to select a specified number of hubs from a fixed set of demand centers, to allocate each demand center to a hub, and to decide on the release times of trucks from each demand center in such a way that the total amount of cargo guaranteed to be delivered to every pot...
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作者：Day, Robert W.; Cramton, Peter
作者单位：University of Connecticut; University System of Maryland; University of Maryland College Park
摘要：We report on the use of a quadratic programming technique in recent and upcoming spectrum auctions in Europe. Specifically, we compute a unique point in the core that minimizes the sum of squared deviations from a reference point, for example, from the Vickrey-Clarke-Groves payments. Analyzing the Karush-Kuhn-Tucker conditions, we demonstrate that the resulting payments can be decomposed into a series of economically meaningful and equitable penalties. Furthermore, we discuss the benefits of t...
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作者：Atar, Rami
作者单位：Technion Israel Institute of Technology
摘要：We study a diffusion regime-earlier considered by Gurvich, Mandelbaum, Shaikhet, and Whitt in the case of the M/M/N queue which may be regarded in a sense that we make precise, as a midpoint between two well-known heavy traffic diffusion regimes, the conventional and the quality and efficiency driven regimes. Unlike the other two, this regime, which we call the nondegenerate slowdown regime, enjoys the property that delay and service time are of the same order of magnitude, a property that is ...
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作者：Ryzhov, Ilya O.; Powell, Warren B.; Frazier, Peter I.
作者单位：University System of Maryland; University of Maryland College Park; Princeton University; Cornell University
摘要：We derive a one-period look-ahead policy for finite- and infinite-horizon online optimal learning problems with Gaussian rewards. Our approach is able to handle the case where our prior beliefs about the rewards are correlated, which is not handled by traditional multiarmed bandit methods. Experiments show that our KG policy performs competitively against the best-known approximation to the optimal policy in the classic bandit problem, and it outperforms many learning policies in the correlate...
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作者：Adams, Warren P.; Henry, Stephen M.
作者单位：Clemson University; United States Department of Energy (DOE); Sandia National Laboratories
摘要：This paper presents an approach for representing functions of discrete variables, and their products, using logarithmic numbers of binary variables. Given a univariate function whose domain consists of n distinct values, it begins by employing a base-2 expansion to express the function in terms of the ceiling of log(2) n binary and n continuous variables, using linear restrictions to equate the functional values with the possible binary realizations. The representation of the product of such a...
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作者：Ayer, Turgay; Alagoz, Oguzhan; Stout, Natasha K.
作者单位：University System of Georgia; Georgia Institute of Technology; University of Wisconsin System; University of Wisconsin Madison; Harvard Pilgrim Health Care; Harvard University; Harvard Medical School
摘要：Breast cancer is the most common nonskin cancer and the second leading cause of cancer death in U.S. women. Although mammography is the most effective modality for breast cancer screening, it has several potential risks, including high false-positive rates. Therefore, the balance of benefits and risks, which depend on personal characteristics, is critical in designing a mammography screening schedule. In contrast to prior research and existing guidelines that consider population-based screenin...
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作者：Vulcano, Gustavo; van Ryzin, Garrett; Ratliff, Richard
作者单位：New York University; Columbia University
摘要：We propose a method for estimating substitute and lost demand when only sales and product availability data are observable, not all products are displayed in all periods (e.g., due to stockouts or availability controls), and the seller knows its aggregate market share. The model combines a multinomial logit (MNL) choice model with a nonhomogeneous Poisson model of arrivals over multiple periods. Our key idea is to view the problem in terms of primary (or first-choice) demand; that is, the dema...
