BPO数据生产平台的设计与优化

根据对在线数据业务外包服务(data business process outsourcing,Data BPO)处理流程中存在的一系列瓶颈的描述和分析,提出了现有的BPO数据处理平台进行优化设计的方案,构建了BPO数据生产平台的优化模型.该模型有针对性地使用了包括自动、半自动模式识别技术,服务器集群动态负载均衡以及非对称网络传输等技术,有效地解决了数据生产平台的吞吐量、服务器负载以及网路传输瓶颈,提高了整个数据处理平台的效率及准确率.     

基于二叉排序树的缓冲机制在污染源监控系统中的研究

针对污染源在线自动监控系统，提出了二叉排序树的数据缓冲机制的方案，设计树形存储结构，将其进行平衡化处理，完成结构化缓冲存储，实现了基于二叉排序树的数据缓冲机制的污染源在线自动监控系统。该机制不仅避免了数据直接存放于数据库服务器的时间延迟，提高了数据检索效率，而且降低了时间复杂度。通过实验测试发现该方法对污染源在线自动监控系统的整体性能有明显的改善作用。     

基于无线传感器网络的海水水质在线监测系统开发

针对海水水质现场采样监测问题的困难性,提出了一种利用无线传感器网络技术和计算机技术的在线监测方案。方案涵盖感知层、网络层和应用层,通过把现有的水质传感器连接到微控制器上,利用无线传输模块实现点区域的数据汇集,汇集数据通过GPRS模块接入互联网中,上位机服务器接收和处理数据并把结果存放到数据库中。方案对无线传感器网络的布设做了简单的介绍,给出了监测网络的数据传输存储流程,并对上位机服务器程序和海水水质数据库的建设做了详细介绍。方案通过实物搭建和实验验证了可行性。     

一种数据库迁移和日志传送方案的实现

服务器性能不佳,会影响SQL Server数据库的运行效率。当服务器崩溃时,数据库里的大量数据如何恢复?用SQL Server 2000标准版支持的日志传输功能,可以实现一种切实可行的数据库服务器迁移和日志传送方案。     

基于RTMP的流媒体服务器的研究

多媒体数据要在网络上传输,必须先对多媒体数据进行流化处理。要想流化多媒体数据,就需要流媒体服务器。所以流媒体服务器对多媒体数据的传输有着至关重要作用。其中流化处理就是对多媒体数据进行封装,把音视频数据打包成能进行流传输的数据包。而且提高流媒体服务器的性能一个有效途径是提高缓存的利用率,使系统为更多的媒体流服务。文章以RTMP为基础,首先分析了该传输协议,并提出了一种改进的缓存策略,使流媒体服务器性能有了提高。     

基于图数据库的在线族谱编录系统

针对目前国内族谱系统中数据共享度不高、扩展性不好、编录效率较低等问题,提出并实现了一种基于浏览器/服务器(B/S)架构和图数据库的在线族谱编录系统.首先,该系统采用B/S架构,支持多人在线协同录入,提高了数据录入效率;其次,系统使用数据库存储数据,便于集中管理和统计检索,提高了数据的共享程度;然后,考虑到族谱数据具有图的结构特性,在系统中采用图数据库进行管理,大大提高了数据处理效率;最后,使用真实族谱数据进行了系统的效率对比,验证了系统的有效性.在实验中,使用了约20万人的刘氏族谱数据,对关系数据库PostgreSQL和图数据库Neo4j管理数据进行了存储和查询的效率对比.实验结果表明,Neo4j比PostgreSQL节省约50%的存储空间,而在人物后代查询、人物祖先查询、人物亲缘关系查询以及人物后代性别统计4种常见查询中,使用Neo4j的平均响应时间约为基于PostgreSQL数据库的20%、80%、16%和15%.由此可知,基于图数据库的在线族谱编录系统可用于高效处理大量族谱数据,并且支持多用户在线协同编录.     

1:50000水利基础电子地图数据库建设

阐述了1:50000水利基础电子地图数据库在水利信息化工作中的重要作用,设计了1:50000水利基础电子地图数据库建设的技术流程,重点描述了资料收集、数据预处理和数据建设等技术要点。在数据库建设的基础上,分析了数据库管理维护和服务平台的具体内容,以及所应具备的功能。     

中心导航系统终端地图预取和更新策略研究

为解决中心导航系统终端通过网络下载电子地图时,网络延时问题对终端地图实时显示的影响,根据空间相关性原理,提出了一种电子地图数据的预取和更新策略.该策略采用对电子地图分块传输和分块存储方法,对地图数据进行预取,并且使用二级缓存的方法,提高地图显示效率.仿真实验和实际车载实验结果表明,在CDMA的数据链路性能条件下,该预取和更新策略可以保证中心导航系统车载终端地图显示的实时性.     

压力变送器制造车间MES的设计与实现

传统的生产管理系统存在管理混乱、材料浪费等现象,而制造执行系统可以优化车间生产过程、实时协调生产任务。根据压力变送器的生产工艺流程,对系统模块架构进行了设计,并对生产规划运行流程和系统作业流程进行了研究。系统开发采用C/S模式,分为客户端、服务器和数据库三层,通过若干个业务逻辑构建共享数据库,提高数据库服务器的运行效率和安全性能。客户端界面开发使用基于.NET平台的用户界面框架(WPF)软件,将界面描述与程序代码分开,以提高开发效率;客户端与服务器之间遵循HTTP协议,使用POST方法和Json方式传输;服务器采用Servlet技术处理HTTP请求,完成应用程序和数据存储之间的逻辑运算;采用MySQL数据库、JDBC类和接口,实现数据通信和存储。该系统具有简单实用、可配置性强、界面简洁等特点,为企业实现信息化管理提供了一定的参考。     

分布式组件在不可靠网络数据库访问中的应用

针对不可靠军事通信应用系统中网络数据库访问效率低的问题,提出一种基于分布式组件的数据库访问模型。在该模型中,客户端通过数据缓存减少对服务器数据库的读取次数,服务器端使用分布式组件管理客户端连接,并在数据发生变化时主动将更新通知到客户端,以减少网络上传输的数据流量。估算结果表明,该模型可有效提高应用系统的效率。     

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.