一种adhoe无线网络的路由调度模型

无线网络中传统体系结构的多层之间存在强耦合关系，这些层与层的相互作用在网络路由与数据传输过程中不能被忽视。现针对adhoc无线网络的路由问题提出一种结合路由与能量控制的调度模型。通过该模型能够提高无线网络数据传输效率，控制传输的网络能量消耗。     

An Integrated Strategic and Tactical Master Surgery Scheduling Approach With Stochastic Resource Demand

This study discusses a master surgery scheduling approach that maximizes hospital revenues while considering the impact on the downstream resources—intensive care units and general patient wards. Demand for these resources is modeled by a stochastic patient path model. I apply an integer programming model to provide the optimal allocation of how many (strategic planning problem) and what (tactical planning problem) operating room (OR) blocks to assign to each medical specialty. I demonstrate further applications of the model, such as the analysis of the value of flexible resources and the simulation of specific resource expansions. The approach is tested with real‐life data from a German university hospital and achieves significant revenue increases.     

基于增量表达式的滚动发电计划模型与其求解算法研究

滚动发电计划是对日前计划的有效补充。在实际调度过程中，基于电网当前的运行状态与最新的预测信息，制定机组的滚动发电计划，能有效消除日前计划所存在的偏差，降低实时调度工作量，提升电网运行安全性。本文针对当前滚动计划研究中存在的对日前计划改变过大，求解效率较低两方面问题，以相对日前计划改变量作为决策变量，设计了基于增量表达式的滚动计划模型；并从模型目标项含二次项的特点出发，设计了基于拉格朗日对偶法的分解协调算法。最后通过我国某省实际算例验证了所提出模型与算法的实用性。     

Variable neighborhood search heuristic for storage location assignment and storage/retrieval scheduling under shared storage in multi-shuttle automated storage/retrieval systems

This paper examines the joint optimization of storage location assignment and storage/retrieval scheduling in multi-shuttle automated storage/retrieval systems (AS/RSs) under shared storage, in which the reuse of empty location yielded by retrieval operation is allowed. From the view of analytical model, the advantage of operational mode under shared storage is verified. A variable neighborhood search (VNS) algorithm is developed to solve the large-sized problems. Various numerical experiments are conducted to evaluate the performance of the proposed algorithm and investigate the impact of different parameters on computational efficiency.     

The ship routing and freight assignment problem for daily frequency operation of maritime liner shipping

To cope with excess capacity and improve service quality, maritime international liner carriers have recently adopted a new operational model known as daily frequency. In this new model, carriers provide daily pickup and delivery service to customers at major ports along the Pacific Rim. We investigate the ship routing and freight assignment problem for daily frequency operation of liner shipping. A solution procedure that incorporates a Lagrangian relaxation technique and local search was proposed. The numerical results show that Shanghai, Hong Kong and Singapore are ports that are ideal for carriers in establishing daily frequency operations along the Pacific Rim.     

A rolling planning horizon heuristic for scheduling agents with different qualifications

This paper presents an optimization model for the tour scheduling problem for agents with multiple skills and flexible contracts in check-in counters at airports. The objective is to minimize the total assignment costs subject to demand fulfillment and labor regulations. In order to solve this problem we develop a rolling planning horizon-based heuristic. Our heuristic is robust and provides near-optimal schedules within reasonable computation time for real-world cases, although the parameter selection is important to its performance. In addition, we discuss the impact of the skill distribution on the scheduling costs for several instances.     

基于Web的实验室教学自动排课系统设计与实现

介绍了实验室排课系统的设计思路、特点及相关技术,并结合具体实际情况,提出并开发一套以处理排课问题的算法为核心的自动排课系统。     

基于ZIGBEE的无线传感网络的研究与设计

本文简单讲述了无线传感器网络技术在实际中的应用,详细介绍了ZIGBEE技术的定义,特点,和组网原理。其中更是对ZIGBEE的网络节点类型、网络拓扑结构和路由方式进行了深入的研究。最后,基于ZIGBEE技术的特点和组网原理,对无线传感网络进行探索研究,组建了一个简单的无线传感网络,用以采集环境的温湿度数据以及传感器板的电压,并对结果进行了分析。     

物流配送的车辆调度排班问题分析

随着经济的不断发展,城市正发生着日新月异的变化。城市的发展离不开大量货车的使用,所以如何解决物流配送车辆优化调度的问题就逐步成为城市建设发展的焦点。物流配送车辆优化调度的问题,即对固定的装(卸)货地点,选择较为适当的行车路线让车辆井然有序的从各个路点通过,并且在按照要求完成任务的情况下还起到了一定的优化作用。文中从物流配送车辆优化调度问题在国内外的现状分析开始入手,对物流配送的概述和流程进行了介绍,通过模拟试验利用动态策略解决实际的NP问题,还近一步的分析了国内外在物流配送车辆优化调度上针对实际问题的发展方向。     

基于人员和车辆可租赁条件下的车辆路径选配模型及优化

物流服务供应商面临的决策问题常常是复杂的规划问题。文中考虑短程的计划,物流服务供应商在需求点的时间窗、车辆的容积和人员的调度,包括租用的人员和车辆的条件下决定收发件路线,建立了路线和人员调度相结合的规划模型。采用节约启发式算法来求解车辆路径问题,得到路线安排的满意解。之后采用贪婪启发式算法对人员进行分配,通过实际案例得出:在租赁人员和车辆的情况下比不租赁人员和车辆总的费用更低。结果表明,启发式算法既能够满足时间限制,又能够节约运输里程和费用。