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1.
梁振英  王朝立  陈华  李彩虹 《自动化学报》2016,42(10):1595-1604
研究了不确定非完整移动机器人系统的跟踪问题.首先,基于视觉反馈和状态输入变换,展示了一种非完整移动机器人运动学系统的不确定链式模型.基于反步法思想和跟踪误差系统结构,给出了两个重要的新变换.然后运用李雅普诺夫直接方法和扩展巴巴拉引理设计了自适应控制律和动态反馈鲁棒控制器,以实现理想轨迹的跟踪控制.严格证明了闭环误差系统的渐近收敛性.最后,仿真结果证实了提出的控制策略有效.  相似文献   

2.
在OSGi服务平台中,服务的注销会使和该服务相关联的ServiceReference引用和服务引用过时,过时的ServiceReference引用和服务引用会带来许多问题.但服务什么时候被注销,无法预先知道,且无普遍实用的判定ServiceReference引用和服务引用是否过时的算法.本文通过对OSGi服务平台核心事件的产生和投递过程深入细致的分析,提出了判定ServiceReference引用和服务引用是否过时的方案.  相似文献   

3.
刘勇奎  李笑牛  云健 《计算机工程与设计》2007,28(23):5680-5681,5794
提出了一种三维物体表面的逼近表示与数据压缩方法.该方法可以在不增加表示物体表面的数据量(例如面片数量)的情况下,使逼近误差降低约1/2;在逼近误差不变的情况下,使表示物体表面的数据量大幅下降.提出了用与最基本的三维物体--球体表面相交的面片来表示球面的方法,将该方法扩展到了一般曲面.理论分析与实验数据表明,新算法与传统方法相比,其数据压缩比约为35%.该研究在虚拟现实技术和三维模型的数据压缩及传输等领域有较重要的学术及应用价值.  相似文献   

4.
研究了如何在Windows与Linux这两种最流行的操作系统之间进行互操作:在单机情况下,共存于同一机器的Windows与Linux如何互访文件系统,利用模拟器软件运行各操作系统下的应用程序;在网络情况下,运行不同操作系统的计算机如何共享文件与打印机;如何利用虚拟机软件运行另一操作系统下的应用程序.并简要分析比较了所用到的软件工具的机理及安装与使用方法.  相似文献   

5.
紧随SolidWorks公司2005年用户大会,老牌SolidWorks代理商智诚科技也于2005年7月在香港、广州和深圳召开了年度用户大会.本次盛会吸引了近200名来自深圳、东莞、惠州及香港等地的工程师参加,智诚科技及其合作伙伴在会上除向与会嘉宾介绍MoldOffice、3DQuickPress和SolidCAM外,还隆重推介了SolidWorks 2006和COSMOS 2006.记者亲历本次深圳盛会,并在参会期间,同智诚科技有限公司总经理Kelvin Chong荘敏先生及其合作伙伴、用户进行了深入交流,从不同侧面了解他们对SolidWorks及智诚科技的看法.  相似文献   

6.
《数码世界》2008,7(11)
本刊讯 北京时间5月12日14时28分,四川阿坝州汶川县(北纬31度,东经103.4度)发生了8.0级地震.本次地震具有强度大、影响面广、破坏严重等特点,强烈的地震造成灾区道路受阻、电力中断、通信线路和设施损毁,致使四川、甘肃、重庆、陕西等省(市)部分地区的通信不同程度的受损.  相似文献   

7.
如何设计一款能够通过网络实现远程拍照和浏览照片的IPCamera?本文通过采用ARM9和USB摄像头实现IPCamera.IPCamera使用S3C2410、AX88796等元件来组成硬件平台,再将Linux系统移植到硬件平台上,然后设计好相应的驱动程序和应用程序,最后将软件下栽到硬件平台.  相似文献   

8.
很多用户都选择了Windwos XP和Windows Vista组成双系统,这样的方式一来可以很好地体验Vista,二来也可以随时切换到XP系统下完成Vista系统下"不可能完成的任务". 笔者就是遵循了上述想法安装了双系统,可是在格式化Vista所在分区重启机器时出现了一个问题(如图1).我明明在格式化后将C盘(XP所在分区)根目录下的"boot.ini"文件做了修改,为什么还会出现这样的情况呢?  相似文献   

9.
计费系统的模型是计费系统的核心组成部分,计费系统模型的性能直接影响到计费系统的性能.本文针对现有计费系统模型的弊端,提出一个新的模型.经实验证明此新的模型支持新的费率,支持扩展,而且更加的灵活,更加的稳定,并且具有一定的通用性.  相似文献   

10.
VoIP技术已经广泛应用于企业级的语音业务,但是为了安全性和节省IP地址的使用,目前大量的企业和局域网都采用Firewall/NAT技术连接到Internet.比较了传统的Firewall/NAT的穿越方案,并介绍和比较了较新的ICE和VPN穿越方式,描述了各种穿越方法的穿越机制,分析了各种方法的优缺点,并作了横向比较.  相似文献   

11.
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.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
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.  相似文献   

13.
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。  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
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  相似文献   

17.
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.  相似文献   

18.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

19.
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.  相似文献   

20.
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.  相似文献   

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