基于按需路由的MPRN多播算法

文章提出了采用按需路由发现策略的移动分组无线网多播路由算法。在算法中不需要维护全局的路由信息,通过按需路由发现过程,动态更新路由信息和建立多播转发组。多播数据包在转发组成员间进行有限泛洪,能够降低带宽的占用及减少路由更新信息的传播。模拟实验显示多播算法在带宽较低、多播组成员数量变化较大的移动分组无线网环境中,具有较好的可靠性和工作效率。     

移动Ad Hoc网络中一种多播路由协议算法实现

MANET是一个多跳,节点无中心、自组织、互相通信而不依赖于预先架设的固定基础设施无线移动网络。本文提出了采用按需路由发现策略的移动Ad Hoc多播路由算法。此算法不需要维护全局的路由信息,通过按需路由发现过程,动态更新路由信息和建立多播转发组。多播数据包在转发组成员间进行有限泛洪,能够降低带宽的占用及减少路由更新信息的传播。仿真实验显示多播算法在带宽较低、多播组成员数量变化较大的移动分组无线网环境中,具有较好的可靠性和工作效率。     

一种基于MANET的多播协议的设计与实现

传统的应用于有线网络的多播方法很难适应MANET所具有的拓扑结构变化和带宽有限等特点，无法有效地应用于MANET。提出了采用按需路由发现策略的MANET多播路由协议MFGRP。在MFGRP协议中不需要维护全局的路由信息，通过按需路由发现过程，动态更新路由信息和建立网格。多播数据包在转发组成员间进行有限泛洪，使协议能够降低带宽的占用及减少路由更新信息的传播。模拟实验显示协议在带宽较低、多播组成员数量变化较大的移动分组无线网环境中，具有较好的可靠性和工作效率。     

Ad hoc数据通信网络多播路由算法

文中提出了采用按需路由发现策略的Ad hoc数据通信网络多播路由算法。算法采用按需路由发现过程，动态更新路由信息和建立多播转发组。文中详细介绍了算法的实现过程。模拟实验显示算法在带宽较低、多播组成员数量变化较大的Ad hoc数据通信网络环境中，具有较好的可靠性和工作效率。     

移动分组无线网多播协议的设计与实现

提出了用于移动分组无线网的多播路由协议。在移动分组无线网环境中，多播路由协议起着非常重要的作用。传统的应用于有线网络的多播方法无法适应移动分组无线网具有的拓扑结构变化和带宽有限等特点。在协议中不需要维护全局的路由信息，而采用按需路由发现策略，动态建立路由信息及维持多播组成员关系。仿真实验显示协议在带宽较低、多播组成员数量变化较大的移动分组无线网环境中，具有较好的可靠性和工作效率。     

一种采用按需路由策略的MPRN路由协议

提出了一种采用按需路由发现策略的移动分组无线网路由协议。协议采用按需路由发现过程,动态更新路由信息和建立路由转发组。数据包在转发组成员间进行有限泛洪,使协议能够降低对带宽的占用及减少可能的大量路由更新信息的传播。     

一种MANET多播方法及其时延控制策略

文章提出了一种新的基于时延控制的MANET多播方法,不需要维护全局的路由信息,而采用按需路由发现策略,动态建立路由信息及维持多播组成员关系。给出了时延控制算法,算法有助于提高多播在移动环境中的鲁棒性。仿真实验显示在带宽较低的移动无线网环境中,时延控制可以提高传输可靠性和执行效率。     

基于按需路由的MPRN路由协议

提出了采用按需路由发现策略的MPRN路由协议OFGRP。在OFGRP协议中不需要维护全局的路由信息，通过按需路由发现过程，动态更新路由信息和建立网络。数据包在转发组成员间进行有限泛洪，使协议能够降低带宽的占用及减少路由更新信息的传播。模拟实验显示协议在带宽较低的MPRN网络环境中，具有较好的可靠性和工作效率。     

多QoS约束的多播路由协议的改进

随着Internet、移动网络及高性能网络的不断发展，具有QoS约束的多播路由技术已成为网络及分布式系统领域的一个重要研究课题。文章研讨了具有多QoS约束的多播路由问题，其中主要包含延迟、延迟抖动、带宽、代价等QoS约束。针对现有多Qos约束的多播路由算法进行了改进，不仅有效减少了生成多Qos约束的多播树开销，而且能够很好地支持组成员的动态加入和离开，而不干扰现有的多播树。算法实例证明改进后的算法减少了报文转发的数量，从而降低了多播树生成时间。     

多约束QoS动态多播路由算法

YAM和QoSMIC是支持QoS动态多播路由算法,允许多播组成员动态地加入/退出,同时为接收方提供多个可选择的多播接入路径,以满足不同应用的QoS需求。该文在分析这些算法的基础上,研讨了具有延迟、延迟抖动、带宽和代价等多约束QoS的多播路由问题,描述了一种适应于研究QoS多播路由的网络模型,提出了一种具有多约束QoS的动态多播路由算法(MQDMR),MQDMR试图有效地减少生成多约束QoS的多播树的开销。在MQDMR中,一个多播组成员能动态地加入/退出一个多播会晤,且不干扰现有的多播树。仿真实验结果表明,MQDMR比YAM和QoSMIC具有较小的延时和较少的代价。     

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     

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.     

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。