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。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.