-
作者：Mumbower, Stacey; Garrow, Laurie A.
作者单位：University System of Georgia; Georgia Institute of Technology
摘要：In this paper we describe a database of online airline prices collected from a major online travel agent and a low-cost carrier. The database provides detailed pricing data for all nonstop flights offered in a market. Data are provided for 42 domestic U. S. markets across a 28-day booking horizon for 21 departure dates. Each of the 42 markets is served by one or more low-cost carriers. These data can be used to investigate the evolution of prices and price dispersion for monopoly, duopoly, and...
-
作者：Klosterhalfen, Steffen T.; Minner, Stefan; Willems, Sean P.
作者单位：BASF; Technical University of Munich; Boston University
摘要：Many real-world supply networks source required materials from multiple suppliers. Existing multiechelon inventory optimization approaches either restrict their scope to multiple supply sources in two-echelon systems or single suppliers in multiechelon systems. We develop an exact mathematical model for static dual supply in a general acyclic N-echelon network structure, which builds on the guaranteed-service framework for safety stock optimization. It is assumed that the suppliers are allocat...
-
作者：Zhan, Dongyuan; Ward, Amy R.
作者单位：University of Southern California
摘要：In a call center, agents may handle calls at different speeds, and also may be more or less successful at resolving customers' inquiries, even when only considering customers calling with similar requests. One common measure of successful call resolution is whether or not the call results in the customer calling back. This presents a natural trade-off between speed and quality, where speed is defined as the average time before an incoming call is answered (the average waiting time) and quality...
-
作者：Agrawal, Anupam; Van Wassenhove, Luk N.; De Meyer, Arnoud
作者单位：University of Illinois System; University of Illinois Urbana-Champaign; INSEAD Business School; Singapore Management University
摘要：In this paper, we explore how firms can better manage their sourcing by developing relationships not only with their suppliers but also with their suppliers' suppliers. We detail an empirical case study explaining how the firm developed relationships with its suppliers and raw material suppliers via a collaborative center, the sourcing hub. We then analytically model the scenarios encountered in our empirical work and examine two facets of upstream sourcing under uncertain demand scenarios: (a...
-
作者：Mak, Ho-Yin; Rong, Ying; Zhang, Jiawei
作者单位：Hong Kong University of Science & Technology; Shanghai Jiao Tong University; New York University
摘要：Managing appointments for service systems with random job durations is a challenging task. We consider a class of appointment planning problems that involve two sets of decisions: job sequencing, i.e., determining the order in which a list of jobs should be performed by the server, and appointment scheduling, i.e., planning the starting times for jobs. These decisions are interconnected because their joint goal is to minimize the expected server idle time and job late-start penalty costs incur...
-
作者：Mak, Ho-Yin; Shen, Zuo-Jun Max
作者单位：Hong Kong University of Science & Technology; University of California System; University of California Berkeley
摘要：The benefits of inventory risk pooling are well known and documented. It has been proven in the literature that the expected costs of a centralized system are increasing in the degree of (positive) dependence of demand in an idealized newsvendor setting. Using the supermodular stochastic order to characterize dependence, we study a general two-tiered supply chain structure, in which both demand and supply yields are random, and prove that the expected costs are increasing in the degrees of pos...
-
作者：Secomandi, Nicola; Kekre, Sunder
作者单位：Carnegie Mellon University
摘要：Spot and forward purchases for delivery on the usage date play an important role in matching the supply and the uncertain demand of energy because storage capacity for energy, such as electricity, natural gas, and oil, is limited. Transaction costs tend to be larger in spot than forward energy markets near maturity. Partially procuring supply in the forward market, rather than entirely in the spot market, is thus a potentially valuable real option, which we call the forward procurement option....
-
作者：Yom-Tov, Galit B.; Mandelbaum, Avishai
作者单位：Technion Israel Institute of Technology
摘要：We analyze a queueing model that we call Erlang-R, where the R stands for reentrant customers. Erlang-R accommodates customers who return to service several times during their sojourn within the system, and its modeling power is most pronounced in time-varying environments. Indeed, it was motivated by healthcare systems, in which offered-loads vary over time and patients often go through a repetitive service process. Erlang-R helps answer questions such as how many servers (physicians/nurses) ...
-
作者：Wan, Zhixi; Beil, Damian R.
作者单位：University of Oregon; University of Michigan System; University of Michigan
摘要：We study a buyer who periodically auctions off short-term supply contracts among her supply base. To mitigate significant cost shocks to procurement, the buyer can diversify her supply base by selecting suppliers from different regions. We find that the buyer's decision to diversify depends on her bid-taker power-that is, her ability to choose the auction mechanism. At one extreme, when the buyer has full bid-taker power and thus can dictatorially implement the optimal mechanism, she always pr...
-
作者：Guo, Pengfei; Lindsey, Robin; Zhang, Zhe George
作者单位：Hong Kong Polytechnic University; University of British Columbia; Western Washington University; Simon Fraser University
摘要：We model a two-tier queuing system with free and toll service options as two parallel M/M/1 servers. We solve for the welfare-maximizing toll service capacity and toll subject to the constraint that the toll service cover its costs. If the free and toll services are both used in equilibrium, a larger free-service capacity implies longer expected waiting time for the free service and lower welfare: an analogue to the Downs-Thomson paradox in transportation economics. The paradox is caused by th...
