融合PSO和Powell的雷达组网反隐身部署优化算法

针对多雷达组网探测隐身目标的部署优化问题, 根据雷达探测隐身目标的简化模型,在目标运动轨迹确定的情况下,设计了反隐身部署优化 两级指标。由于雷达网部署为具有多个可行解的多目标优化问题,提出了一种融合粒子群(P article swarm optimization, PSO)和 鲍威尔(Powell)搜索法的分层搜索算法。首先采用粒子群优化算法得到全局和局部最优解, 然后采用 鲍威尔算法进一步搜索得到部署方案。仿真结果表明,提出的算法充分结合了粒子群算法的 全局搜索能力和鲍威尔算法的局部搜索能力,与仅采用粒子群算法相比,得到的部署方案在 保证责任区覆盖的前提下,有效提高了雷达网对隐身目标的探测概率,增加了对隐身目标的 预警距离。     

基于免疫遗传算法的雷达组网方法

区域防空雷达网是防空作战空情预警的发展趋势,为了提高区域雷达网探测能力和抗综合电子干扰、抗隐身技术与隐身飞机的威胁,抗低空、超低空突防及抗反辐射导弹(ARM)的能力,研究雷达组网的问题,介绍免疫遗传算法的基本原理和特点,提出基于免疫遗传算法的雷达组网方法,通过计算机仿真实验证明方法的可行性。     

基于多传感器组网的临空高速飞行器协同检测技术研究

临近空间高速飞行器飞行距离远,速度快,单一传感器对此类目标检测能力有限.为了提高实时检测能力,行之有效的方法是多传感器融合检测.分析了目标在不同俯仰角和方位角时雷达横截面(RCS)随传感器频率的变化情况,分别仿真了X波段、P波段、C波段的探测点迹完整率,并对雷达组网协同检测系统的探测点迹完整率进行仿真.结果表明:采用分布式雷达组网协同检测方法可有效提高检测概率.     

基于PSO-DT算法的多雷达优化组网仿真

为使防区内多部、多类型雷达的探测效能得到最大发挥，并有利于探测到突防目标，必须将现有的雷达进行有效组网。该文在给定的预警区域内根据组网要求，提出了一种带有扰动项的改进粒子群算法(PSO-DT)，仿真结果表明该算法能满足组网要求。     

基于改进粒子群优化的机载预警雷达组网

研究空中机载预警雷达优化设计问题,两部或多部机载预警雷达如何部署,才能充分发挥机载预警雷达的战术效能,满足最大限度地监控随作战态势的发展而变化的重点监控区域的需要.为提高现代战争中空中预警的性能,提出一种改进的粒子群优化算法,对机载预警雷达组网中的部署问题进行优化.首先假定机载预警雷达探测范围是没有盲区的理想圆形区域,得出一个优化的组网试验,再进一步进行有盲区机载预警雷达活动范围受限时的组网试验.最后,提出一个预警机按特定航线巡航状态下优化试验方案.实验结果表明,改进方法行之有效.     

基于SAGA的区域防空雷达组网优化部署

区域防空雷达组网是防空作战空情预警的发展趋势。研究了雷达网优化部署问题，建立了评估模型，设计了雷达网优化部署的模拟退火遗传算法，仿真结果证明该方法对雷达组网部署优化具有一定参考价值。     

基于混合优化的移动传感器网络反隐身研究

利用隐身目标的空间特性和移动传感器网络中探测器的机动性,提出了一种基于传感器轨迹优化的反隐身策略。针对隐身目标提出雷达波束入射角的概念并给出其表达式,提出基于模拟退火和粒子群的混合轨迹优化方法,提高优化算法的收敛速度、精度以及全局搜索能力。该反隐身策略本质上是通过对移动传感器运动轨迹的规划,充分利用传感器网络带来的信息获取优势,使用集中式检测融合对该组网系统的发现概率和跟踪性能进行仿真,仿真结果表明组网系统反隐身性能明显提高,轨迹优化结果符合工程实际。     

相控阵雷达系统功能仿真及应用

在国土防空预警网优化问题的研究中,相控阵雷达具有频率捷变等特点和多目标跟踪能力,是构成国土防空预警网的重要组成部分.以雷达组网、组网雷达资源管理及相关算法测试为背景,嵌入到雷达组网仿真平台中并获得实测数据,提供了一种相控阵雷达功能仿真方法,重点讨论了波位编排、目标检测和相控阵雷达的任务调度算法等模块的实现.最后仿真系统对三个普通目标以及一个隐身目标在雷达扫描空域的搜索、验证、跟踪、失跟等雷达事件进行了仿真结果分析,验证了相控阵雷达系统和相关算法的有效性.     

机载有源自卫干扰下雷达探测效能仿真

随着现代电子战的快速发展,机载自卫有源干扰成为了对抗雷达最有效措施之一,严重威胁雷达探测效能与生存能力。从作战效能评估需求出发,选取探测概率作为定量评估指标。首先把雷达探测过程分解成不同功能模块,通过各模块的有机结合构建探测模型,并详细介绍了各模块数学模型。然后,对雷达动态探测过程进行功能仿真,并基于HLA平台开发仿真系统。最后,通过仿真,能在线获得对应目标距离的探测概率,并以此定量分析了有源自卫干扰下雷达探测效能。仿真结果验证了模型和方法的可行性与有效性,对雷达反对抗研究提供一定的参考依据。     

一种用于隐身目标探测的外辐射源雷达组网系统

介绍了现有隐身技术以及部分已经装备和正在研制的隐身目标,分类介绍了雷达反隐身的多种措施.在此基础上,提出了外辐射源雷达组网反隐身系统,给出了系统的基本构成、工作原理、系统反隐身原理和系统关键技术.从初步仿真结果可以看出,该系统在工作频率,双/多基地工作方式、组网工作、多频工作和准连续波工作等方面对探测隐身目标均具有一定优势.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate