无存储器中冲突的并行快速排序算法

本文在一个ＥＲＥＷ ＰＲＡＭｅｘｃｌｕｓｉｖｅ ｒｅａｄ ｅｘｃｌｕｓｉｖｅ ｗｒｉｔｅ ｐａｒａｌｌｅｄ ｒａｎｄｏｍ ａｃｃｅｓｓ ｍａｃｈｉｎｅ）上提出一个并行快速排序算法，这个算法用Ｋ个处理器可将Ｎ个项目在平均Ｏ（ｎ／ｋ＋ｌｏｇｎ）ｌｏｇｎ）时间内排序，所以平均来说算法的时间和处理器数量的乘积对任何ｋ≤ｎ／ｌｏｇｎ是Ｏ（ｎｌｏｇｎ）。     

二维模式近似匹配的快速算法

给定一个大小为ｎ×ｎ的文本Ｔ和一个大小为ｍ×ｍ的模板Ｐ，如果文本Ｔ中存在一个ｍ×ｍ的子块与模板Ｐ能够逐点匹配，称为精确匹配。如果最多有ｋ个元素不同，称为带有最多ｋ个误差的近似匹配。对于精确匹配，本文给出了一个时间复杂性为Ｏ（ｎ２ｌｏｇ｜∑｜）的算法，∑＝｛ａ１，２，…，ａ｜∑｜｝，是模板的字符集。对于近似匹配，快速算法分为两步：（１）预选。利用精确匹配算法找出能精确匹配的ｓ×ｓ（０≤ｓ≤ｍ）子块，得到ｈ个候选的对准点；（２）验证。把模板对准候选点，逐点比较，以确定不相同的元素是否不超过ｋ个。近似匹配的时间复杂性为Ｏ（ｎ２ｌｏｇ｜∑｜＋ｈｍ２）。     

并行归并排序算法

构造效率为Ｏ（１）的并行算法是一个引人注目的问题。［１］和［２］分别提出了并行度为Ｏ（ｌｏｇｎ）和Ｏ（ｎ＾１／２）的、效率为Ｏ（１）的并行排序算法。本文提出一种新的并行排序算法，其效率为Ｏ（１），而并行步数小于［１］和［２］的算法的并行步数。经过改进后，在保持效率为Ｏ（１）的情况下，可进一步将并行度扩大到Ｏ（ｎ＾１／２ｌｏｇ ｎ）。     

基于Wormhole路由的二维Mesh上的并行k-选择

由于二维网孔机器的结构简单、规整,易于ＶＬＳＩ实现,使得它不仅成为许多理论研究的基础模型,而且还是许多并行机所采用的互连结构．Ｗｏｒｍ ｈｏｌｅ 路由技术的采用改进了二维网孔机器的通信能力．该文在带有Ｗｏｒｍ ｈｏｌｅ 路由技术的ｎ×ｎ 二维网孔机器上提出了一个时间复杂度为Ｏ（ｌｏｇ２ｎｌｏｇｌｏｇｎ）的并行ｋ－选择算法,改进了该问题在Ｓｔｏｒｅ－ａｎｄ－Ｆｏｒｗ ａｒｄ 路由技术下的时间复杂度下界Ｏ（ｎ）．据已掌握的资料,该算法为最早的、非总线连接的二维网孔机器上的、时间复杂度为对数的多项式级的ｋ－选择算法．     

完全欧几里德距离变换的最优算法

欧几里德距离变换（ＥＤＴ）对由黑白素构成的二值图象中所有象素找出其到最近黑素的距离，应用于图象分析，计算机视觉，在本文之前，该问题的最好复杂度为Ｏ（ｎ＾２ｌｏｇｎ）。本文提出了一个复杂度为Ｏ（ｎ＾２）的算法，使复杂度达到最优，该算法可以并行化，在有ｒ个处理单元的ＥＲＥＷＰＲＡＭ计算模型上，若ｒｌｏｇｒ≤２２／６ｎ，则时间复杂度为Ｏ（ｎ／ｒ）否则为Ｏ（ｎｌｏｇｒ）。     

判定点集是否在多边形内部的算法

本文提出了判定ｎ个点的点集Ｓ是否落入多边形Ｌ内部的算法，该算法的复杂性为：ｍａｘ（Ｏ（ｍｎ），Ｏ（ｌｎ ｌｏｇ ｎ））比比较和Ｏ（ｌｎ）次乘法，其中ｍ是Ｌ的顶点数，ｌ为Ｓ的凸包层数。     

一个选择算法及其并行化

文中用合并选择的思想及堆上的最佳算法，给出了求解选择问题的一个新算法及其相应的并行化。将串行合并选择算法的复杂度ｎＬｏｇｋ＋Ｏ（ｎ）降低到（ｎＬｏｇｋ）／２＋（ｎＬｏｇＬｏｇｋ）／２＋Ｏ（ｎ），并保持了原并行算法的结构，在ＳＩＭＤ树型机器的并行计算模型上，并行运行     

最短路径重构算法

研究了在Ｎ个顶点的图中，仅给出了所有顶点对之间最短路径距离矩阵，而计算任两顶点间最短路径问题。这种算法因没有利用原始图中有关边的信息，被称为重构算法。本研究取得了如下成果：①在单一的顶点对之间最短路径重构的时间复杂度为Ｏ（ｎｌｏｇｎ）；②在所有顶点对之间的最短路径重构的时间复杂度为Ｏ（ｎ＾３）；③在带有ｎ／ｌｏｇｎ个处理器的独占读写并行随机访问器上，单一顶点对之间的最短路径重构时间复杂度为Ｏ（（ｌ     

货郎担问题最优并行启发式算法

本文给出了满足三角不等式的货郎担问题的并行启发式算法，在ＳＩＭＤ ＣＲＥＶ ＰＲＡＭ并行机上该算法使用Ｏ（ｎ＾３／ｌｏｇ＾２ｎ）台处理器需Ｏ熄ｌｏｇ＾２ｎ）时间，这里ｎ是给定城市的个数，因而该并行算法是最优的。     

一类扩展的Steiner树优化问题及其应用

本文提出了一个计算机网络通信和分布式系统中的一类扩展的Ｓｔｅｉｎｅｒ树问题．对此问题设计了两个求其最优解的算法．这两个算法的时间复杂性分别是Ｏ（３（ｋ－１）·ｎ＋２（ｋ－１）·ｎ２）和Ｏ（２（ｎ－ｋ）·ｎ２）．其中，ｋ是一棵Ｓｔｅｉｎｅｒ树需支撑的给定顶点的个数．     

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。     

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。