A Heuristic for the Job Scheduling Problem with a Common Due Window on Parallel and Non-Identical Machines

1. INTroDUCTIONThe emergence of JIT (Just in Time) management tee~gy opens up a recency research field for the jobscheduling and production managemellt. As its farther develOPment, the earnness-tardiness job schedulingproblem becomes a hot research point over y6ars. conference [1] gives a review on job scheduling problem withearnness and tardiness penalties. Reference [2] p~s another scheduling problem for minimizing the rangeof lateness on a single machine, and reference [3] giVes a he…     

An Application of Grey Clustering Method in the Sporting Clothing Style Evaluation

1. INTroDUCTIONIn recent years, sporting clothing is develOPed quickly all over the world. In order to upgrade the level of qualityand weaxing property of sporting clothing, it is necessary to reseaxch the style of sporting clothing, optimize thetechniques of production. In the past, the inspection of sporting clothing Style is a manual work through visionand feeling, but it is not scientific and has compaxative fall. Now some clothing style testing instrumellts havebeen introduced for th…     

STABILITY CRITERIA FOR A CLASS OF UNCERTAINSYSTEMS WITH TIME—DELAY

Some stability criteria are obtained for a class of uncertain systems with time-delay usingLyapunov functional and analytic techniques. It is easy to check the criteria by making use of theboundedness of the uncertainties.     

PERSPECTIVES ON URBAN WATER INFRASTRUCTURE IN CHINA FOR THE 21~(ST) CENTURY: SDMUWEIC MODEL

Based on system dynamics approach, SDMUWEIC model is developed in order to evaluate future dynamics of urban water infrastructure development in China. Firstly, this paper presents the basic structure and characteristics of the model, focusing on water infrastructure's dynamic relationships with population increase, economic development, water resources shortage and water conservation practices. Secondly, model veracity and robustness tests based on behavior reproduction and uncertainty analyses are illustrated. Thirdly, based on the model, future patterns of China's urban water infrastructure investment requirements are simulated, and effectiveness of two different policy scenarios are evaluated. Finally, conclusions and policy implications are drawn, allowing insights into China's sustainable water infrastructure policies and managements.     

Fuzzy Entropy Based Combined Learning Algorithm for Neural Networks

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系统稳定性

本章讨论线性时不变多变量反馈系统,目的是找出包括传递函数的奈奎斯特图的稳定条件。本章给出了一组这样的条件,为讨论奈奎斯特逆阵列、特征轨迹和顺序返回差异设计程序提供了恰当的基础。     

未来的计算机的体系结构

自从1981年10月在东京的国际会议上日本发表第五代计算机规划以来,在计算机科学界渐渐承认冯·诺依曼式计算机的地位将变得愈来愈不重要。计算从顺序而集中转向并行而分布,此时大量的系统必须在一起工作,这将要求有新一代的通用计算机。     

导弹的闭路测试

直至1978年前后导弹的闭路飞行模拟基本上还局限于预研阶段使用,主要用以帮助动力学工程师了解导弹的飞行性能。这些试验测试的主要参数是导弹在难度不同的各种作战条件下的脱靶量。政府所属的一些试验室,如PMTC(太平洋导弹试验中心)和WQEC(武器质量工程中心)有时也进行这种测试。它们的目的是进一步探索在复杂环境条件下导弹的作战能力及其性能劣化情况。导弹在投产之后,生产厂一般不再进行这类测试,除非有时为了专门研究导弹飞行     

星载双站雷达:未来战争防空警戒的一种可能手段

静止轨道上的星载双站雷达(SBBR)对未来战术防空警戒是十分有用的。到本世纪九十年代中期,研制这种雷达在技术上是可行的。那时若干关键性的技术将发展成熟,可以提供应用。本文提出一种SBBR的设计方案,并根据预定的技术方案对该雷达的空间设备的重量作一粗略估算。     

关于高空防空导弹制导设计的综合考虑

本文介绍一种高空雷达导引防空导弹的实用设计考虑。讨论了影响脱靶距离的三种主要因素——雷达信号反射、雷达导引头组合不完善和导弹响应限制。在高空,闪烁是雷达信号中的主要干扰。此外,导引头组合不完善,如框架稳定不理想、天线罩折射率和导引头陀螺对加速度的敏感度都引起稳定性和脱靶距离问题。制导系统设计人员必须解决这些问题。 最后,由于加速度能力下降、响应时间延长以及控制舵面速率饱和,导弹对制导指令的响应也受到限制。文中讨论了脱靶距离对每一种因素的敏感度,另外,也论述了与组合不完善引起的多余反馈通道有关的稳定性问题。介绍了几个数字实例,它们说明:在构成系统时,如果要在高空满足性能目标,那么在初步设计中考虑实际硬件的不完善是很重要的。本文提供了对实际问题的一个透视,在理论研究中常常把这些问题看成是第二位的,但是实际上它们可能是决定制导和控制设计参数的主导因素。