Multiproduct batching and scheduling with buffered rework: The case of a car paint shop

We study a problem of scheduling products on the same facility, which is motivated by a car paint shop. Items of the same product are identical. Operations on the items are performed sequentially in batches, where each batch is a set of operations on the same product. Some of the produced items are of the required good quality and some items can be defective. Defectiveness of an item is determined by a given simulated function of its product, its preceding product, and the position of its operation in the batch. Defective items are kept in a buffer of a limited capacity, and they are then remanufactured at the same facility. A minimum waiting time exists for any defective item before its remanufacturing can commence. Each product has a sequence independent setup time which precedes its first operation or its operation following an operation of another product. A due date is given for each product such that all items of the same product have the same due date and the objective is to find a schedule which minimizes maximum lateness of product completion times with respect to their due dates. The problem is proved NP‐hard in the strong sense, and a heuristic Group Technology (GT) solution approach is suggested and analyzed. The results justify application of the GT approach to scheduling real car paint shops with buffered rework. © 2014 Wiley Periodicals, Inc. Naval Research Logistics 61: 458–471, 2014     

基于非入侵式负荷小区用电设备监测技术

加强用电设备能耗的监测是我国提高电能利用率、实现能源可持续发展、建设节约型社会的重要手段。通过对国内外用电设备监测技术和方法的研究,以及对几种常用用电设备识别方式、原理和优缺点的比较,提出了一种基于非入侵式负荷的谐波电流面积监测技术。采用该技术对小区用电设备进行Matlab仿真,并对仿真结果进行分析和验证。结果证明该技术能提高用电设备的识别精度和能耗监测效率,对减少小区经济损失、提高电力系统稳定性、实现能源可持续发展具有一定的意义。     

Reduction of global effects on vehicles after IED detonations

Global effects caused by the detonation of an IED near a military vehicle induce subsequent severe acceleration effects on the vehicle occupants. Two concepts to minimize these global effects were developed, with the help of a combined method based on a scaled experimental technology and numerical simulations. The first concept consists in the optimization of the vehicle shape to reduce the momentum transfer and thus the occupant loading. Three scaled V-shaped vehicles with different ground clearances were built and compared to a reference vehicle equipped with a flat floor. The second concept, called dynamic impulse compensation (DIC), is based on a momentum compensation technique. The principal possibility of this concept was demonstrated on a scaled vehicle. In addition, the numerical simulations have been performed with generic full size vehicles including dummy models, proving the capability of the DIC technology to reduce the occupant loading.     

全分布式人工智能技术在舰艇指控系统中的应用研究

为适应未来信息化海战场的需要,必须提高舰艇指控系统的指挥效能。舰艇指控系统的智能化是提高舰艇指挥效能的关键,也是必由之路。本文主要论述了信息战中智能化作用的地位,特别针对舰艇指控系统;并给出了一种采用全分布式人工智能技术的智能化舰艇指控系统结构模型。     

舰载指控系统一体化仿真研究

本文提出了舰载指控系统一体化仿真体系结构,其一体化仿真模型用到了诸如面向对象、数据库、可视化等技术,具有较好的人机交互界面,能实现作战模拟、评价作战方案等。     

初中生信息素养的实践研究

随着现代信息技术的飞速发展,信息技术教育受到普遍的重视。培养学生的信息能力、提高学生的信息素养是信息技术教育的根本目标。信息素养是终身学习的基础,具备了一定的信息素养,学习者才能够获得学习的内容,能够对所做的研究进行扩展,能够对自身的学习进行更有效地控制,使其具备终身学习能力、竞争能力和创新能力。只有加强信息素养的教育,教育的职能才会充分发挥作用。本文就如何在信息技术教育中提高初中学生信息素养做了研究。     

援潜救生进度风险分析

失事潜艇的援救要求在潜艇失事后48h内展开,综合考虑援救任务耗时的随机性和模糊性,将计划评审技术PERT(project evalution and review technique)和模糊概率分析结合起来,用以评估援潜救生任务的进度风险。首先,给出了单独使用PERT技术计算援潜救生准备工作在48h内完成的概率的基本算法;然后,将模糊概率分析引入PERT技术,求出援潜救生任务的关键路线,给出基于模糊PERT分析的完工概率算法;最后,以深潜救生艇从我国北方某基地转运至目的地实施救援任务为例,计算援潜救生准备工作在48h内完成的概率。计算结果的对比表明:使用模糊PERT分析方法比单独使用PERT技术得出的数据更为可靠。     

近空间飞行器关键技术及其发展趋势分析

未来一体化联合作战将具有陆、海、空、天、临“五维一体”的特点,临近空间以其在信息支援与远程快速投送两方面的优势在基于信息系统的体系作战中具有重要的战略地位.从技术层面概括了临近空间飞行器的最新进展,重点分析了其关键技术与发展趋势,对其发展提出了几点看法.     

航路规划中数字地图综合处理技术

以中远程反舰导弹航路规划为背景,研究了数字地图应用的相关处理技术。首先介绍了数字高程模型及其相应的处理技术,其次论述了对数字海图进行网格划分的基本原则,然后分析了计算地图上每个网格单元的代价MC(Map Cost)所需考虑的主要因素,最后给出由MC生成的最小代价BC(Best Cost)的方法,为下一步航路规划算法的实现奠定了基础。     

人工免疫系统的战场异态电磁信号检测模型

分析了复杂电磁信号环境下电磁信号监测的现实需求,抽象出"异态电磁信号"的概念。结合人工免疫系统建立起基于人工免疫系统的适用于复杂电磁环境下异态电磁信号检测模型,初步的信号检测实验表明该模型在信号检测准确性、检测时间等方面具有一定优势。