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INTRODUCTION Autonomous mobile robot is a machine able to extract information from its environment and use knowledge about its world to move safely in a meaningful and purposive manner, it can operate on its own without a human directly controlling it (Ehlert,1999). The primary task of a mobile robot is envi-ronmental navigation as basis for more useful tasks. In contrast to indoor mobile robots and industrial manipulation robots both working in relatively static and structured environme… 相似文献
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Chatting language is a unique phenomenon confined to the Internet.It is of great interest to a great number of re searchers.This paper is going to make a research in the following aspects:categories of cyber chatting language in China and its distinguishing features.By doing so,it is hoped that more and more people can be aware of the use of online chatting language and use it on proper occasions. 相似文献
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This paper proposes a simple and efficient distributed algorithm for calculating minimal dominating set in wireless sensor network. This method can avoid maintaining the connectivities between backbone hosts. Considering that the hosts in mobile networks have different characteristics, this paper proposes a method of calculating minimal dominating set with weight. The nodes can be chosen to form a minimal dominating set when the network topology changes. For the host switch on/off operation, the updating algorithm was provided. The change in the status of a host affects only the status of hosts in the restricted vicinity. Simulation results show that the proposed method can ensure fewer dominators but with higher weight to form the minimal dominating set and the nodes can be adaptive to the changes of network topology. 相似文献
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Toni Morrision’s Beloved earns a wide degree of recognition for its stylistic brilliance and psychological depth in American liter ature and it is discussed not only as a presentation of slavery,but also as motherhood.This paper,in the light of Shklovsky’s theory of defa miliarization,aims to exam the application of the techniques of defamiliarization in Beloved from the following two aspects:narrative point of view and language strategies. 相似文献
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Efthym los A lepis Maria Virvou 《美中教育评论》2010,7(7):84-92
Mobile computing facilities may provide many assets to the educational process. Mobile technology provides software access from anywhere and at any time, as well as computer equipment independence. The need for time and place independence is even greater for medical instructors and medical students. Medical instructors are usually doctors that have to treat patients on top of their tutoring duties. Mobile features are complementary to web-based features for desktop computers to a high extend in asynchronous e-learning environments. Time and place independence is also a considerable potential for medical students with overloaded educational duties. This paper examines the degree of the usefulness of mobile facilities for medical instructors who wish to author and manage their courses by using a mobile authoring tool. Furthermore, this paper investigates how acceptable and useful the mobile features of an e-learning system have been to medical students who have used the system, in comparison with the use of the system through a desktop computer. In addition, it investigates usability issues. 相似文献
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Sister Carrie is the young protagonist of the novel of the same name who moves from Wiscons to Chicago and accomplishes her rise to aristocracy in the cutthroat city environment.This novel mainly depicts this girl’ s metamorphosis.At first,she is no more than a poor bumpkin.However,in the end,she unexpectedly transforms into a glamorous actress.Yet,things by no means are as idealized as they appear to be.On the contrary,it is a process of struggle along with degeneration. 相似文献
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Metaphor is a common linguistic phenomenon and always realizes its value within a certain context.Metaphor uses words to indicate something different from their literal meaning-one thing is described in terms of another so as to suggest a likeness or analogy between them.A metaphor can easily be seen as a bridge which links and comprises the known and the unknown,the familiar and the unfamiliar.Some people hold that metaphor tends to be seen as a way of coloring the ordinary plain language.Meanwhile some people think that metaphor is regarded as a way of experiencing the world.An analysis on English and Chinese metaphor translation will help to strengthen our understanding of different languages as well as different cultures.This paper focuses on the structure and features of metaphor,correspondences and several techniques in metaphor translation. 相似文献
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Product data management (PDM) is a unique technique that integrates and manages all applications, information and processes defining a product from design to manufacture, and to end-user support. However, exploration of valuable information and knowledge from the PDM system has become a key in improvement of efficiency and implementation of knowledge management in an enterprise. This paper introduces a data mining prototype system model based on PDM, and emphasizes some important techniques such as design of the prototype system framework, methods of data selection and integration of data mining prototype system and PDM. The model basically solves the problem of functional losses in mining and analyzing data in PDM. Application of data mining to PDM is meaningful to the ideas and techniques of PDM, and to the rapid development of data mining application itself. Also, it is useful in improving development and usage of enterprise databases. 相似文献
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李娜 《湖州职业技术学院学报》2006,4(1):88-91
Mobile Agent技术是随着计算机技术及网络技术的发展普及而产生的分布式计算模型,它是为解决复杂的、动态的、分布式的智能型应用问题而提出的一种全新的计算手段,它的体系结构包括Mobile Agent(简称MA)和Mobile Agent ServiceEnvironment(简称MASE)两部分,计算模式有移动计算模式、协同计算模式和移动协同计算模式三种,在电信网络、电子商务及入侵检测等领域具有十分广泛的应用前景。 相似文献
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Parineeth M. Reddy 《Resonance》2002,7(7):35-43
A software agent is an intelligent program that acts as a user’s personal assistant. Software agents endowed with the property
of mobility are called mobile agents. Mobile agents perform a user’s task by migrating and executing on several hosts connected
to the network. 相似文献
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在讨论供应链管理结构与实现过程的前提下,针对供应链管理模式的动态性,引入移动代理技术,对分布的制造企业资源进行了集成,并提出了一个完整的供应链管理系统. 相似文献
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在传统的用户/服务器网络结构中,本地数据需要传送到目的地去进行计算和处理,而移动代理的出现则使移动计算变为了现实.移动代理的移动性使之比用户/服务器网络结构更适用于传感器网络.本文提出了一种适用于传感器网络的通用移动代理结构.这种结构称为基于移动代理的传感器网络(MAWSN).本结构中的移动代理可以从以下三个方面减少信息冗余度和通信的额外开销以延长网络的生存时间:①通过本地处理功能减少应用层的冗余度;②通过数据汇聚功能减少数据的空间冗余度;③通过多目标数据融合功能减少通信的额外开销. 相似文献
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随着网络信息量及速度的急剧上升,入侵检测技术必然也随之改变,分布式入侵检测就是一个好的选择。本文构建出一个基于移动Agent分布式入侵检测模型;探讨了该模型的实现并对其性能进行了仿真实验验证。该模型采用“域内集中处理,域间互助协作”的工作方式,将整个受保护的网络划分成若干个域,每个域内是一个完整的中心分析型分布式入侵检测系统,域间地位平等,互相协作,共同完成分布式入侵检测。这样以来,既能克服单点故障问题,又便于管理,容易分析判别是本地攻击还是分布式攻击。 相似文献
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互联网给人们提供了无限丰富的信息，可是当前的浏览工具却没有提供有效的手段来缩短网络连接时间。由此提出了一个多智能体结构来辅助无线移动用户进行软件检索与安装，它是智能信息检索领域的重要课题。 相似文献
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随着Internet的发展和信息共享需求的不断提升,语义网作为下一代Web技术成为计算机领域中的一个研究热点.Agent是一种新的分布式计算方式,是分布式人工智能中的重要技术.文章将Agent与语义网相结合,提出基于Agent技术的语义网服务模型. 相似文献
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电子政务是全面推动政府部门信息化、网络化的的核心要素,已成为政府转变职能、提升行政效率、提高服务水平的关键。本文以电子政务为研究对象,提出了基于移动Agent的Web集成系统解决方法,在一定程度上提升了传统电子政务的效率,同时为Web系统的应用开发提供了新的研究方向。 相似文献
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网络管理在迅速发展的网络环境中是一个关键，传统的集中式管理方法在可扩展性、可靠性、灵活性方面存在一定的不足。网管站派遣移动代理到各被管节点上去收集数据和执行网管操作，这样可以减少网络上不必要的中间数据传输，从而可以明显地节省网络带宽并减小网络延迟。通过移动代理将管理智能分布到网元，降低了网管平台的开销和网络负荷，可改善网管系统的可扩展性。探讨了采用移动代理解决网络管理中存在服务器性能瓶颈和负载平衡问题的方法。 相似文献