-
作者：Zhao, Jinye; Hobbs, Benjamin F.; Pang, Jong-Shi
作者单位：Johns Hopkins University; Johns Hopkins University; University of Illinois System; University of Illinois Urbana-Champaign
摘要：Carbon dioxide allowance trading systems for electricity generators are in place in the European Union and in several U.S. states. An important question in the design of such systems is how allowances are to be initially allocated: by auction, by giving away fixed amounts (grandfathering), or by allocating based on present or recent output, investment, or other decisions. The latter system can bias investment, operations, and product pricing decisions and increase costs relative to the other s...
-
作者：Delage, Erick; Ye, Yinyu
作者单位：Universite de Montreal; HEC Montreal; Stanford University
摘要：Stochastic programming can effectively describe many decision-making problems in uncertain environments. Unfortunately, such programs are often computationally demanding to solve. In addition, their solution can be misleading when there is ambiguity in the choice of a distribution for the random parameters. In this paper, we propose a model that describes uncertainty in both the distribution form (discrete, Gaussian, exponential, etc.) and moments (mean and covariance matrix). We demonstrate t...
-
作者：Armony, Mor; Ward, Amy R.
作者单位：New York University; University of Southern California
摘要：In a call center, there is a natural trade-off between minimizing customer wait time and fairly dividing the workload among agents of different skill levels. The relevant control is the routing policy, that is, the decision concerning which agent should handle an arriving call when more than one agent is available. We formulate an optimization problem for a call center with heterogeneous agent pools, in which each pool is distinguished by the speed at which agents in that pool handle calls. Th...
-
作者：See, Chuen-Teck; Sim, Melvyn
作者单位：National University of Singapore; Singapore-MIT Alliance for Research & Technology Centre (SMART); National University of Singapore; Nanyang Technological University; Massachusetts Institute of Technology (MIT)
摘要：We propose a robust optimization approach to address a multiperiod inventory control problem under ambiguous demands, that is, only limited information of the demand distributions such as mean, support, and some measures of deviations. Our framework extends to correlated demands and is developed around a factor-based model, which has the ability to incorporate business factors as well as time-series forecast effects of trend, seasonality, and cyclic variations. We can obtain the parameters of ...
-
作者：Sheopuri, Anshul; Janakiraman, Ganesh; Seshadri, Sridhar
作者单位：International Business Machines (IBM); IBM USA; University of Texas System; University of Texas Dallas; University of Texas System; University of Texas Austin
摘要：We study an inventory system under periodic review in the presence of two suppliers (or delivery modes). The emergency supplier has a shorter lead-time than the regular supplier, but the unit price he offers is higher. Excess demand is backlogged. We generalize the recently studied class of dual index policies [Veeraraghavan, S., A. Scheller-Wolf. 2008. Now or later: Dual index policies for capacitated dual sourcing systems. Oper Res. 56(4) 850-864] by proposing two classes of policies. The fi...
-
作者：Ye, Heng-Qing; Yao, David D.
作者单位：Hong Kong Polytechnic University; Columbia University
摘要：We study a stochastic network that consists of two servers shared by two classes of jobs. Class 1 jobs require a concurrent. occupancy of both servers while class 2 jobs use only one server. The traffic intensity is such that both servers are bottlenecks, meaning the service capacity is equal to the offered workload. The real-time allocation of the service capacity among the job classes takes the form of a solution to an optimization problem that maximizes a utility function. We derive the dif...
-
作者：Lai, Guoming; Margot, Francois; Secomandi, Nicola
作者单位：University of Texas System; University of Texas Austin; Carnegie Mellon University
摘要：The valuation of the real option to store natural gas is a practically important problem that entails dynamic optimization of inventory trading decisions with capacity constraints in the face of uncertain natural gas price dynamics. Stochastic dynamic programming is a natural approach to this valuation problem, but it does not seem to be widely used in practice because it is at odds with the high-dimensional natural gas price evolution models that are widespread among traders. According to the...
-
作者：Cont, Rama; Stoikov, Sasha; Talreja, Rishi
作者单位：Columbia University
摘要：We propose a continuous-time stochastic model for the dynamics of a limit order book. The model strikes a balance between three desirable features: it can be estimated easily from data, it captures key empirical properties of order book dynamics, and its analytical tractability allows for fast computation of various quantities of interest without resorting to. simulation. We describe a simple parameter estimation procedure based on high-frequency observations of the order book and illustrate t...
-
作者：Murphy, Frederic; Smeers, Yves
作者单位：Pennsylvania Commonwealth System of Higher Education (PCSHE); Temple University; Universite Catholique Louvain
摘要：Allaz and Vila made the seminal contribution that forward contracts mitigate market power on the spot market. This result is widely quoted and elaborated in studies of restructured power markets, where generators can potentially exploit the special characteristics of this industry in order to extract higher prices. Allaz-Vila established their result under/the assumption that the production capacities of the players are infinite. We show that the Allaz-Vila result does not hold when capacities...
-
作者：Hall, Nicholas G.; Potts, Chris N.
作者单位：University System of Ohio; Ohio State University; University of Southampton
摘要：This paper considers scheduling problems where the processing of a set of jobs has been scheduled (i.e., planned) to minimize a classical cost objective, under the assumption that the jobs are all available at the start of the planning horizon. Before processing starts, however, the availability of a subset of the jobs is delayed. Therefore, the decision maker needs to adjust the existing schedule to allow for the initial unavailability of those jobs, but without causing excessive disruption t...
