基于工作流的新一代多卫星地面预处理系统设计与实现

在分析现有各种遥感卫星地面预处理系统的基础上,指出制约实现通用地面预处理系统平台的因素,提出了一种基于工作流技术的新一代多卫星地面预处理系统实现方案,并成功进行了工程实践,解决了卫星地面预处理系统多卫星载荷处理功能扩展问题。     

遥感卫星地面站业务运行管理系统模型和流程设计方法

业务运行管理系统是遥感卫星地面系统业务运行的组织和管理中心,但是不同的遥感卫星地面系统因其业务和功能设置不同,其业务运行管理系统在设计上也千差万别。本文分析了业务运行管理系统的特点、国内各个遥感卫星地面应用系统业务运行与管理的共性与特性,设计了一种具有树状层次结构的适合多种遥感卫星地面系统业务运行管理的通用业务模型,并且引入了面向对象技术进行业务运行管理系统的流程设计。该业务模型和系统流程设计方法兼具通用性和可扩展性,既能够适应不同的遥感卫星地面应用系统的业务运行管理系统的设计与实现,又能够通过灵活配置与扩展,在设计和实现中适应业务不同的需求和业务种类的变化。     

卫星多体制测控地面测试系统设计

随着航天技术的不断发展,卫星功能日趋复杂,对卫星测控分系统的功能提出更高的需求,要求同时支持对地非相干扩频测控、中继测控、扩跳频测控及测量数传测控体制,对卫星测控系统地面测试平台多体制支持、通用化及自动化测试能力、可靠性提出了更高要求;本文研究了卫星多体制测控地面测试平台系统设计方法,采用了多通道测控地检通道复用、基于数据库的通用化配置及自动化测试技术,应用于某遥感卫星的地面测试,测试结果表明：该平台运行稳定,取得了良好的使用效果,满足了卫星多体制测控地面测试需求;     

卫星星座综合测试系统研究

卫星星座等多星并行研制生产带来了多星并行综合测试的新课题.介绍了一套卫星星座模式下的综合测试系统,该系统由总控设备和各分系统专用测试设备组成,通过标准网络和通信协议形成统一指挥和调度的卫星电气综合测试体系.详细介绍了系统的总控设备以及各分系统专用测试设备,并分析了地面综合测试系统的信息流.该系统可靠性和可扩展性程度高,为多星并行综合测试系统的模块化、通用化和系列化提供了一个有效的参考,满足了卫星星座多星并行综合测试的需要.     

遥感卫星地面接收系统业务能力评估

随着航天事业的快速发展,遥感卫星的发射数量越来越多,遥感卫星地面接收系统面临着快速、稳定的接收新发射卫星下传数据的迫切需求。在此背景下提出了一种遥感卫星地面接收系统业务能力的评估方法,建立基于AHP的业务能力评估指标体系。结合业务特点,阐述了系统单机状态评估模型、系统业务能力评估模型并确定了各级因素的影响权重。实例分析结果表明,此评估方法能够快速确定遥感卫星地面接收系统对于某遥感卫星数据接收业务能力状态,给出系统最小化改进指引,对系统资源的利用及优化提供了可行性建议。     

光纤在卫星测试系统数据采集中的应用

详细介绍了采用光纤进行采集数据传输的卫星地面测试系统的设计原理和各组成部分的实现方法。与目前的测试设备相比,提高了地面测试过程中数据传输的环境适应能力,以及卫星数据采集系统在地面高低温、EMC等专业试验测试过程的成功率,提高了系统的测试效率。     

热红外静止卫星地震监测系统综合技术研究

基于Windows NT服务和Socket套接字程序整合设计了卫星数据处理后台管理服务系统,从底层开始自主开发了卫星数据准实时自动处理系统。通过该系统避免了大量的人工操作,获得了大量的、连续的、覆盖全国的热红外无云遥感影像库,能对任意选定的监测区进行热红外亮温动态跟踪和异常警示。通过对地震热红外卫星监测业务运行系统的研究和开发,为地震热红外研究提供了实用的技术手段和技术基础,为卫星热红外等多源遥感卫星及地面应用系统,天地一体化观测数据处理技术提供了经验。     

多源遥感数据挖掘系统技术框架

陆地资源卫星源源不断地把遥感数据传输至地面，卫星地面接收站积累了海量的卫星遥感数据。遗憾的是，由于缺乏针对遥感数据的有效的数据挖掘和知识发现技术，致使遥感数据中的绝大部分信息没有得到充分的利用。对传统的数据挖掘和知识发现技术进行技术革新和改造，研究针对多源遥感图像的数据挖掘和知识发现技术，不仅可以提高遥感解译的自动化和智能化水平，而且可最大限度地开发和利用遥感信息。为了能允分利用遥感数据，在传统数据挖掘和知识发现技术的基础上，首先探讨了遥感数据挖掘和知识发现的技术流程，然后设计了多源遥感图像数据挖掘系统框架，最后提出了多源遥感图像数据挖掘系统的原型，从而为进一步开发和研制多源遥感数据挖掘系统奠定了技术基础。     

多体卫星复合控制地面物理仿真试验系统

对于具有星间链路天线的多体卫星而言，进行星体姿态和天线指向复合控制的地面物理仿真试验研究是一个重要课题。本文主要叙述利用单轴气浮台模拟卫星姿态运动，由天线框架驱动机构实物连接组成多体卫星平面运动动力学环境下的物理仿真试验系统。     

我国对地观测卫星应用成就与展望

本文回顾了我国对地观测卫星在地面数据处理系统建设及卫星数据应用方面取得的成就,并对我国未来对地观测卫星及地面系统发展进行了展望,包括建设国家陆地观测卫星数据中心、建设国家高分辨率对地观测数据中心以及实现我国对地观测连续化、卫星运行业务化、数据获取方式多样化等。     

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