A profit-maximization location-capacity model for designing a service system with risk of service interruptions

This paper considers the design of an immobile service system in which each facility’s service process is subject to the risk of interruptions. The location-capacity decisions and allocations are simultaneously made to maximize the difference between the service provider’s profit and the sum of customers’ transportation and waiting costs. An efficient Lagrangian-based solution algorithm is developed, which solves large-sized instances with up to 50 service facilities and 500 customers in a few seconds. Several sensitivity analyses and managerial insights are presented. The model is also applied to a case study on a logistics network design problem in the zinc mining industry.     

浅谈任务管理系统中任务调度的实现

本文介绍了任务管理系统在业务管理平台中的应用,阐述了任务管理流程、批量任务队列和任务线程的概念,并侧重分析了任务分析器、队列管理器、任务接收器、任务管理池等各个部分在任务调度实现中所起到的作用,以及任务调度的具体流程和实现方法。     

Might randomization in queue discipline be useful when waiting cost is a concave function of waiting time?

This paper suggests that introducing randomization in queue discipline might be welfare enhancing in certain queues for which the cost of waiting is a concave function of waiting time. Concavity can make increased variability in waiting times good not bad for aggregate customer welfare. Such concavity may occur if the costs of waiting asymptotically approach some maximum or if the customer incurs a fixed cost if there is any wait at all. As examples, cost might asymptotically approach a maximum for patients seeking organ transplants who will not live beyond a certain threshold time, and fixed costs could pertain for knowledge workers seeking a piece of information that is required to proceed with their current task, so any delay creates a “set up charge” associated with switching tasks.     

食品类商品进货量的控制

利用排队论思想,对于保质期较短的商品,给出了一种将商品在系统中的平均逗留时间控制在给定的范围内,对相应的进货量进行调控的一种理论方法。     

Queue-rationed equilibria with fixed costs of waiting

The welfare impact of price controls is examined here in an exchange economy where agents may need to queue in order to make a transaction. Time spent in the queue is an endogenously-determined transaction cost, which agents take as given and which adjusts so as to clear markets when prices are prevented from performing this function. When queuing is required, it enters the household’s decision as a fixed cost, rather than increasing in proportion to the amount of good exchanged, as is far more common in the previous literature. Existence of competitive equilibrium is established for this general equilibrium model. Price controls are shown to cause notable inefficiencies, which differ from those of a proportional cost model. Moreover, in certain environments, price controls will unambiguously harm all individuals relative to a Walrasian equilibrium. The author thanks Beth Allen, Chris Phelan, and Jan Werner for their valuable guidance on this work, as well as Michael Magill, Martine Quinzii, Val Lambson, Nuray Akin, participants of the 2005 Midwest Economic Theory Conference, and members of the Mathematical Economics Workshop at the University of Minnesota. This work also benefited from the thoughtful comments of an anonymous referee. Partial funding came from NSF grants DMI-0070257 and DMI-0217974.     

Bayesian inference and prediction in the single server Markovian queue

The use of stochastic models and performance measures for the analysis of real life queuing scenarios are based on the fundamental premise that parameters values are known. This is a rarity since more often than not, parameters are usually unknown and require to be estimated. This paper presents techniques for the same from Bayesian perspective. The queue we intend to deal with is the M/M/1 queuing model. Several closed form expressions on posterior inference and prediction are presented which can be readily implemented using standard spreadsheet tools. Previous work in this direction resulted in non-existence of posterior moments. A way out is suggested. Interval estimates and tests of hypothesis on performance measures are also presented.     

车道被占用对城市道路通行能力的影响分析

针对车道被占用对城市道路通行能力的影响问题,本文对题中所给的附件与数据进行统计分析,分别建立了车道被占用状态下的通行能力模型和格林希尔治模型,得到了道路实际通行能力的变化趋势和差异、,车辆排队长度与其他变量的关系以及信号灯对车辆排队的影响。最后,本文还提出了车道被占用的解决方案.     

Queue management: Elimination,expectation, and enhancement

Queues in a service process represent an unmet customer need and can detract from the value an organization provides. In this article, we present a framework based on three principles for managing customer queues to reduce the discomfort experienced while waiting: (1) eliminate or reduce the wait through process enhancements, (2) manage expectations through timely and relevant communication with one’s customers, and (3) enhance the waiting experience. We provide examples of historical and recent innovations along all three dimensions in multiple situations and suggest practical approaches for managers to add additional value to customers while they wait.     

带后续队列长度通告的呼叫中心性能分析

从排队心理学的角度考虑了队列长度对顾客等待耐心的影响,设计了一个带队列信息通告机制的M／M／N模型。等待的顾客可以像有形排队一样获知目前排队的人数及其所处的队列位置,并以此决定继续等待或者放弃。使用仿真方法对该机制下的呼叫中心性能进行了分析,并与Erlang—A模型和Erlang—C模型进行了比较。     

商业银行缓解客户排队等待策略探讨

如今,快节奏的生活方式使得人们对排队等待愈发无法忍受。这也对诸如商业银行等服务行业的管理和服务水平提出了更高的要求。本文试图从两个方面对如何缓解商业银行的客户排队等待问题进行一些探讨。