基于DLL的工控组态软件内存数据库系统的设计

介绍基于动态链接库DLL的内存数据库系统的设计思想和实现方法。提出在DLL中利用内存映像文件来实现多进程共享内存数据库的方法,同时给出了内存数据库接口。建立的内存数据库系统具有很好的开放性。     

DCS组态软件实时数据库系统的设计

实时数据库系统是DCS组态软件体系结构的关键部分。通过分析实时数据库的特点和DCS系统的使用要求，提出了采取传统数据库系统、文件系统和内存数据库系统兼用的多种存储介质来构建的实时数据库系统，并利用DLL来建立动态实时数据库，从而实现代码和资源共享，进而实现任务间的快速通信。最后给出了实时数据库及相关数据模型的实现方法实例。     

组态软件实时数据库系统研究及设计

利用Windows的DLL(动态连接库)和全局共享内存技术来建立系统实时数据库的设计思想,采取传统数据库系统、文件系统和内存数据库系统兼用,利用多种存储介质来构造系统的实时数据库系统,并通过给用户提供一套接口标准——实时数据库系统接口,来实现I/O驱动程序与用户程序和实时数据库系统间的高速数据传递。     

用于内存数据库的Hash索引的设计与实现

电信领域已成为数据密集型行业,需要高性能的数据库系统作为支撑系统,基于磁盘的数据库系统不能满足“实时”、“近实时”访问数据库的需求,将数据库核心数据驻留在内存中,可以使用内存数据库来满足需求。Hash索引是数据库系统中广泛使用的索引技术之一,它能够快速地访问数据,易于设计和实现。该文根据内存数据库的特点,为电信网管系统的内存数据库设计并实现了Hash索引。     

一种主动实时数据库的系统内存管理方法

通过对一个主动实时数据库(ARTs—DB)的研究，借鉴操作系统的内存管理机制，提出了一种具有现代应用特征的数据库系统内存管理模式。文中从ARTs—DB的系统内存管理定义出发，探讨了主动实时数据库系统内存管理的目标及实现策略，并详细介绍了一种实现方法。     

基于Win CE系统的内存数据库SQL解析器的分析与设计

本文在厦门大学研发的基于WinCE系统内存数据库xMMDB的基础上,利用xMMDB提供的内存数据库API,设计并实现了SQL解析器,使该内存数据库系统能够支持SQL语言。本文阐述了使用yacc工具设计SQL操作的语法树及完成内存数据库系统语法分析的过程,提出了一种SQL解析器的实现方法,通过C语言编写的词法分析程序,向语法分析程序提供单词,并设计了一个结构体存储词法分析中的关键字属性,以便在调用内存数据库API的时候使用。     

内存数据库组织分区法的评析

实时数据库系统(RTDBS)的高性能要求以内存数据库(MMDB)作底层支持。内存数据库分区方法是将数据库逻辑对象存储在内存中的组织管理方法。该文提出了比较不同的数据库组织分区方法的模型和方法,试图找出适合于内存数据库的分区方法。     

主动实时内存数据库系统的数据交换策略及实现

实时数据库系统的高性能要求以内存数据库(MMDB)做底层支持。内存数据库事务在运行过程中没有内外存I/O,这就要求在对事务进行预处理(知识提取)的基础上合理地进行内外存交换。该文针对一个自主开发的主动实时内存数据库系统(ART-Ⅱ),介绍了其内外存数据交换的策略及实现。     

内存数据库相关技术的研究与分析

所谓内存数据库,简单地说就是任何时刻任意一个活动事务所操作的数据集都要存放在内存中,换句话说,内存数据库系统就是数据库的“工作版本“常驻内存的数据库系统.显然.它要求较大的内存量,至少应能存储当前处理的数据,但并不要求在任何时刻整个数据库都存放在内存.内存数据库是支持高性能信息处理的有力工具,是实现诸如实时数据库、智能数据库等的基础,其核心问题是数据库的存储结构及存取方法,以提高空间利用率.为此,首先讨论了内存数据库的定义,接着分析了并发控制、MMDB的逻辑优化规则、动态降低锁粒度和动态提高锁粒度,最后做了总结.     

基于Hash+链表索引的专用型内存数据库系统的设计与实现

文章研究了内存数据库管理系统的原理和关键技术,根据移动短信监控系统中内存数据库的特点,设计和实现了一个基于Hash+链表索引的专用型内存数据库系统,用于解决垃圾短信分析系统中海量短信的存取问题.     

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QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

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。