多卫星遥感数据的信息融合：理论,方法和实践

首先介绍了信息融合技术的有关内容,进而对多卫星遥感数据融合的研究历史及现状进行了简要的综述,在此基础上,以地质应用为目标,探讨了多卫星数据融合的小波变换方法,研究了不同长度的小波基对融合结果的影响,提出了改进的小波融合模型。同时,对比评价了基于小波变换ＣＭＷＤ,ＩＨＳ变换,ＰＣＡ折融合结果在提高空间分辨率,保持原始图象光谱信息的优劣。     

AutoCAD、MDT与其它软件集成应用的几点体会

一个项目常常需要运用几个软件,有效的互相交换数据才能地完成。如企业ＭＲＰⅡ／ＥＲＰ系统中,一般应包括从旧图纸扫描成光栅图像,再编辑的软件如Ｐｈｏｔｏｓｈｏｐ、Ｓｃａｎｓｍｉｔｈｐｒｅｄｉｔｏｒ;能进行光栅矢量混合编辑,部分矢量化的如ＡｕｔｏＣＡＤＯｖｅｒｌａｙ、ＧＴＸ等;现在通用的２Ｄ机械绘图平台ＡｕｔｏＣＡＤ;目前和将来发展的融合２Ｄ与３Ｄ的通用３Ｄ参数化机械设计平台ＭＤＴ;ＣＡＥ软件,如机构仿真ＷＭ　Ｍｏｔｉｏｎ;有限元分析ＷＭＦＥＡ＆ＷＭＣｏｎｃｅpｔ;ＣＡＭ软件,如加工中心ＨｙｐｅｒＣＡ…     

DWMT系统在TMS320C80上的仿真实现

基于小波变换的离散多音传输系统（ＤＷＭＴ系统）是一种抗干扰能力强的高效数据传输系统,其主要在两种实现方案：（１）基于通用可编程ＤＳＰ芯片的软件实现方案;（２）基于通用ＤＳＰ芯片和专用ＶＬＳＩ芯片的软硬件结合方案。本文在分析了ＤＷＭＴ系统的实实现结构、运算量以及滤波器优化方法等基础上,利用ＴＭＳ３２０Ｃ８０软件开发系统对基于通用ＤＳＰ的软件实现方案进行了仿真,并且详细地介绍了该方案的软件流程以及一些     

基于PDM的CAD/CAPP、CAM集成

该文以８６３／ＣＩＭＳ示范工程的实践和开发为依据,对基于产品数据管理（ＰＯＭ）的ＣＡＤ／ＣＡＰＰ、ＣＡＭ集成进行了深入研究。文章首先给出了系统集成的原则,随后提出了ＰＤＭ的框架体系结构和基于ＰＤＭ的集成技术,最后讨论了基于ＳＴＥＰ的产品数据交换和基于ＳＤＡＩ标准数据接口技术。     

一种基于小波变换的FBM图象生成方法

提出了一种基于小波变换的ＦＢＭ图象生成方法，实验证明了这种基于小波变换的生成方法比传统的ＲＭＤＡ方法和Ｆｏｕｒｉｅｒ方法能更精确地生成二维ＦＢＭ图象。     

CAD／CAM软件市场简略

ＣＡＤ／ＣＡＭ软件市场简略东北大学计算中心庞士宗一、ＣＡＤ／ＣＡＭ软件平台目前，占绝对优势的ＣＡＤ／ＣＡＭ软件平台主要有两种，一个是ＵＮＩＸ平台，一个是近几年兴起的ＷＩＮＤＯＷＳ平台。分析最近的ＣＡＤ／ＣＡＭ软件产品可以看出，ＷＩＮＤＯＷＳ平台的ＣＡ...     

协同质量管理的工作流模型与应用

质量控制和管理是企业ＣＩＭＳ应用的一个重要环节，随着企业全面质量管理的展开和ＣＩＭＳ应用的不断深入，迫切需要研制基于网络的协同式的质量管理系统。在质量管理ＰＤＣＡ循环模式的基础上，我们提出了基于ＰＤＣＡ，多Ａｇｅｎｔ的工作流模型，实现了一个能较全面地，较实际地反映企业质量管理中信息处理以及信息流向的，以协同计算方式来表达的质量信息管理系统模型（ＣＱＭＷＦ）。基于Ｌｏｔｕｓ Ｎｏｔｅｓ平台的系统研制     

注塑模CAD／CAE／CAM技术及其发展概况

分析了注塑模ＣＡＤ／ＣＡＥ／ＣＡＭ技术的基本内容，综述了国内外注塑模ＣＡＤ／ＣＡＥ／ＣＡＭ技术的主要特点和研究概况，并指出了存在的问题。提出采用特征造型技术、融合人工智能技术、勾通注塑模ＣＡＤ／ＣＡＥ／ＣＡＭ技术，并指出了进一步发展的方向。     

特征模型与CAD／CAM信息集成的研究

特征建模技术是实现ＣＡＤ／ＣＡＭ集成的核心，本文对建立在Ｉ－ＤＥＡＳ之上特征建模的研究为基础，针对板块类零件，提出了基于特征的集成模型总体结构和数据的组织方法，该模型以面为纽带，将零件的几何信息加工工艺信息有机地联系在一起，以便使ＣＡＤ的数据能方便地被ＣＡＰＰ、ＮＣ等后续环节所使用，从而为ＣＡＤ／ＣＡＭ的集成奠定基础。     

基于CORBA/WEB的产品数据管理系统

企业的实际需求促进了ＰＤＭ产品的发展,市场上出现很多成熟的产品,如ＳＤＲＣ公司的Ｍｅｔａｐｈａｓｅ,ＥＤＳ的ＩＭＡＮ等,国内ＰＤＭ产品也有一定的市场,同创ＰＤＭ、ＩｎｔｅＭＡＮ、高华ＰＤＭ等。前期的ＰＤＭ产品侧重于部门级的设计环节的数据管理与共享,随着用户需求的提高和技术的发展,贯穿企业全过程的企业级ＰＤＭ系统成为开发热点。这种系统应能遵循一定的规范,充分集成现有的应用系统,对跨地域企业的产品数据同样实现信息集成。这需要对ＰＤＭ系统进行重新构架,建立基于ＣＯＲＢＡ／ＷＥＢ的产品数据管理系统。一、…     

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