Determining optimal fuel delivery strategies under uncertainty

During the preparation before a hurricane makes landfall, affected individuals may be asked to evacuate. Large and small-scale evacuations can cause rapid increases in the demand for gasoline fuel. However, during a hurricane vessels carrying gas may be delayed and/or rerouted, adding to the difficulty of providing the necessary gas in affected areas. In this work, we determine alternate delivery locations and times for vessels carrying fuel that are scheduled to arrive and deliver fuel at ports impacted by an approaching hurricane. Motivated by Hurricane Irma in Florida, we develop a multi-period stochastic scheduling model that incorporates hurricane (weather) advisories, fuel delivery schedules, port storage capacities, and port docking capacities. Our model determines the best schedule based on two objectives: (1) minimize the total unmet demand at each port, and (2) minimize inequities in unmet demands among the ports. We also present a case study and a numerical experiment based on fuel delivery data from ports in Florida. Among our key findings is that port availability is the driving factor in determining feasible schedules for vessel gas deliveries. We also present a scheduling heuristic that dynamically adapts to weather advisories so as to minimize the impact of unmet demand in the affected areas.     

企业短信平台关键技术研究

短信平台是企业信息化建设不可或缺的组成部分,然而由于缺乏对短信队列实际有效的管理而使得服务质量受到限制。文章在分析企业短信平台典型结构的基础上,提出设立与管理短信机的前置短信池思想,根据不同系统或不同级别的短信发送需求,设立不同的优先级别,运用一种短信权重轮询调度策略,扩展了企业短信平台搭建方式,保证了重要短信的实时性,并且平滑了突发群短信的输出,该方案已经成功应用于实际系统。     

基于客户满意度的服装业车辆调度研究

从客户满意度的角度出发,针对车辆调度问题进行了优化探讨。首先提出对客户满意度进行评价的客户满意度模糊隶属函数,并在此基础上构造基于客户满意度的车辆调度模型。其次设计了求解车辆调度问题的遗传算法,并和客户满意度模糊隶属函数相结合,可以避免车辆调度问题只能获得满意解的情况。     

配网调度技术分析

本系统是以技术先进性、可靠性、实用性和开放性为原则,结合调度自动化的要求并可扩充到配电自动化中而设计的一套具有当前国内先进水平的电网监控系统。DF9100主站系统采用调度/配电自动化系统一体化设计思想,是一套完整统一的、一致的调度/配电自动化系统。     

项目进度管理的研究现状及其展望

本文对项目进度管理的研究现状进行了总结,介绍了它的基本概念及其常用的几种计划控制技术,总结了项目进度管理的研究现状,主要分为三个方面：时间-费用(成本)优化、资源约束下的项目进度计划、作业活动时间的反映及其计划技术创新,指出了管理理念、管理方法、先进应用方式的提升是项目进度管理的研究方向。     

时间Petri网在项目进度管理建模中的应用

通过分析现有时延Petri网和时间Petri网在项目进度管理仿真模型的不足,提出基于库所时间约束Petri网的项目进度管理模型,该模型具备全局时钟特性,不仅能体现工序自身时间参数,同时能对外部资源等工序外延时间约束进行建模。实例仿真结果表明该模型的有效性。     

单件离散型生产作业排程的多目标协同优化

以某重机企业为背景,分析了单件离散型生产作业排程的特征,提出多目标协同优化问题。基于改进的田口质量损失函数,确立质量、工期与成本之间的非线性关系,综合考虑单件离散型的约束条件,构建了生产作业排程多目标协同优化模型。集成仿真技术和遗传算法,为模型求解提供了有效方法。最后将模型和算法应用到企业的生产实践中,验证了其实用性和有效性,为解决单件离散型生产排程问题提供了科学方法。     

Improving an outpatient clinic utilization using decision analysis-based patient scheduling

This study presents a predictive model to be used in scheduling patients in an urban outpatient clinic. The model is based upon actual patient characteristics from a physical therapy clinic within an urban health and wellness center situated in a public university. A number of reported patients' characteristics such as age, education level, distance from the clinic, historical attendance records, etc. were examined to determine if they significantly impacted the patients' missing scheduled appointments (no-shows.) Decision tree analysis was used to develop a model that assessed the likelihood of a patient's no-show, using key patient characteristics and attendance records. Such a model can be used to assist with scheduling patients in an outpatient clinic, while attempting to increase the clinic's overall utilization. Four tree growing criteria were examined to develop the model with the strongest predictive power. Predictive power of each method was assessed by using the entire dataset as well as using split sampling. The results were then compared with those of a Bayesian networks model and a neural networks model. In addition, the trade-off between the selected decision tree model's predictive power versus simplicity of the associated classification rules was examined. We also assessed the impact of various levels of overbooking on the clinic's utilization when using patients' schedules based on the predictive model.     

生态水库研究及建设东风西沙生态水库探讨

本文通过对国内外生态水库研究现状的调查,阐述了生态水库的概念、内涵及标志,并就东风西沙生态型水库建设及生态调度进行了探讨,是对促进维持水库的基本功能并使其得以可持续发挥的有益尝试,对构建水资源合理利用与生态系统保护之间的和谐关系有着重要意义。     

基于事件调度法的保障器材库存仿真控制系统设计

库存管理是供应链管理中的重要环节,起到缓冲、调节和平衡的作用。作者以库存控制基本理论及仿真基本理论为基础,结合保障器材库存控制的特点,研究设计基于事件调度算法的库存控制仿真系统,为提高保障器材库存管理水平提供有力的工具。