Operations Research
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Evaluating Influence Diagrams An influence diagram is a graphical structure for modeling uncertain variables and decisions and explicitly revealing probabilistic dependence and the flow of information. It is an intuitive framework in which to formulate problems as perceived by decision makers and to incorporate the knowledge of experts. At the same time, it is a precise description of information that can be stored an... ... hiện toàn bộ
Operations Research - Tập 34 Số 6 - Trang 871-882 - 1986
Queuing with Impatient Customers and Ordered Service Two types of customer behavior are considered: (1) if a customer is acquired for service before he has waited a time τ0 , he remains in the queue until served irrespective of whether or not his total waiting time exceeds τ0 . Only those customers who wait for a time τ0 without being acquired for service become “lost” customers, ... ... hiện toàn bộ
Operations Research - Tập 5 Số 5 - Trang 650-656 - 1957
On the Accuracy of Fluid Models for Capacity Sizing in Queueing Systems with Impatient Customers We consider queueing systems in which customers arrive according to a Poisson process and have exponentially distributed service requirements. The customers are impatient and may abandon the system while waiting for service after a generally distributed amount of time. The system incurs customer-related costs that consist of waiting and abandonment penalty costs. We study capacity sizing ... ... hiện toàn bộ
Operations Research - Tập 58 Số 5 - Trang 1398-1413 - 2010
Dynamic Scheduling of a Multiclass Queue in the Halfin-Whitt Heavy Traffic Regime We consider a Markovian model of a multiclass queueing system in which a single large pool of servers attends to the various customer classes. Customers waiting to be served may abandon the queue, and there is a cost penalty associated with such abandonments. Service rates, abandonment rates, and abandonment penalties are generally different for the different classes. The problem studied ... ... hiện toàn bộ
Operations Research - Tập 52 Số 2 - Trang 243-257 - 2004
Fluid Models for Multiserver Queues with Abandonments Deterministic fluid models are developed to provide simple first-order performance descriptions for multiserver queues with abandonment under heavy loads. Motivated by telephone call centers, the focus is on multiserver queues with a large number of servers and nonexponential service-time and time-to-abandon distributions. The first fluid model serves as an approximation for the G/GI/s+GI... ... hiện toàn bộ
Operations Research - Tập 54 Số 1 - Trang 37-54 - 2006
Heavy-Traffic Limits for Queues with Many Exponential Servers Two different kinds of heavy-traffic limit theorems have been proved for s-server queues. The first kind involves a sequence of queueing systems having a fixed number of servers with an associated sequence of traffic intensities that converges to the critical value of one from below. The second kind, which is often not thought of as heavy traffic, involves a sequence of queueing systems i... ... hiện toàn bộ
Operations Research - Tập 29 Số 3 - Trang 567-588 - 1981
Dynamic Control of N-Systems with Many Servers: Asymptotic Optimality of a Static Priority Policy in Heavy Traffic We consider a class of parallel server systems that are known as N-systems. In an N-system, there are two customer classes that are catered by servers in two pools. Servers in one of the pools are cross-trained and can serve customers from both classes, whereas all of the servers in the other pool can serve only one of the customer classes. A customer reneges from his queue if his waiting... ... hiện toàn bộ
Operations Research - Tập 58 Số 1 - Trang 94-110 - 2010
Perishable Inventory Theory: A Review This paper reviews the relevant literature on the problem of determining suitable ordering policies for both fixed life perishable inventory, and inventory subject to continuous exponential decay. We consider both deterministic and stochastic demand for single and multiple products. Both optimal and sub-optimal order policies are discussed. In addition, a brief review of the application o... ... hiện toàn bộ
Operations Research - Tập 30 Số 4 - Trang 680-708 - 1982
Service-Level Differentiation in Many-Server Service Systems via Queue-Ratio Routing Motivated by telephone call centers, we study large-scale service systems with multiple customer classes and multiple agent pools, each with many agents. To minimize staffing costs subject to service-level constraints, where we delicately balance the service levels (SLs) of the different classes, we propose a family of routing rules called fixed-queue-ratio (FQR) rules. With FQR, a newly ... ... hiện toàn bộ
Operations Research - Tập 58 Số 2 - Trang 316-328 - 2010
How Multiserver Queues Scale with Growing Congestion-Dependent Demand We investigate how performance scales in the standard M/M/n queue in the presence of growing congestion-dependent customer demand. We scale the queue by letting the potential (congestion-free) arrival rate be proportional to the number of servers, n, and letting n increase. We let the actual arrival rate with n servers be of the form λn =f(ξn )n, wh... ... hiện toàn bộ
Operations Research - Tập 51 Số 4 - Trang 531-542 - 2003
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