The Mobile Agent is thought to be the popular computing model for the next generation's distributed sys-tem. The mobile agent has the following key features: autonomy, collaboration, security and especially mobili...The Mobile Agent is thought to be the popular computing model for the next generation's distributed sys-tem. The mobile agent has the following key features: autonomy, collaboration, security and especially mobility. Agood communication model for mobile agents cooperation is also necessary. In this article, after describing the maincommunication mechanisms, we analyze the methods to solve Agent Tracking and Communication Failure and makeclassification. We also propose a reliable and efficient mechanism named MEFS which uses Detecting methods andthen analyze its performance by giving the experimental data at the end.展开更多
With the development of computer network, Biometrics, as a kind of information security techniques, is thought more and more of. Handwritten signature verification is an effective one. This paper introduces the design...With the development of computer network, Biometrics, as a kind of information security techniques, is thought more and more of. Handwritten signature verification is an effective one. This paper introduces the design and implementation of an on-line handwritten signature verification system which is based on dynamic programming matching algorithm and give a brief evaluation of its performance. The performance of the system is satisfying according to the experiment.展开更多
以往的包装器主要针对仅含有一个数据块的Web页面，而对含有多个信息块的Web页面，简称MIB(Multiple Information Block), Web页面无法处理。该文提出了一个新的抽取规则，结合了基于文档结构的抽取规则和基于特征Pattern匹配的抽取规...以往的包装器主要针对仅含有一个数据块的Web页面，而对含有多个信息块的Web页面，简称MIB(Multiple Information Block), Web页面无法处理。该文提出了一个新的抽取规则，结合了基于文档结构的抽取规则和基于特征Pattern匹配的抽取规则的优点，能够有效地抽取MIB Web页面中的信息。展开更多
随着Internet上信息量的飞速增长,成千上万的网上文档需要分类以方便用户的浏览和获取。因此文档的自动分类工作已经越来越受到重视,一些相应的分类方法也应运而生。但其中很少有涉及到"层次化"的分类领域,且绝大多数方法仅...随着Internet上信息量的飞速增长,成千上万的网上文档需要分类以方便用户的浏览和获取。因此文档的自动分类工作已经越来越受到重视,一些相应的分类方法也应运而生。但其中很少有涉及到"层次化"的分类领域,且绝大多数方法仅仅返回单个分类结果。文中,我们提出了一种新的文档自动分类方法:MRHC(Multicategory ReturnedAlgorithmforHierarchicalClassification)。该方法着眼于层次化的分类技术,并在适当的情况下为文档返回多个分类结果。该方法中结合了特征削减和增量学习技术以便提高分类性能。最后,为了更加准确、客观的评价分类结果,提出了一种新的评估方法:LEP(Length of Error Path)。实验结果表明,提出的分类方法响应时间短,分类准确度高,具有较强的实用性。展开更多
随着Internet的迅速发展,Web服务在满足数量巨大而日益增长的社会需求中所起的作用越来越大,应用对Web服务器提出了更高的QoS(Quality of Service,服务质量)要求,特别是,要求其处理数量不断变更的用户访问,它们提出大量并发请求,并具有...随着Internet的迅速发展,Web服务在满足数量巨大而日益增长的社会需求中所起的作用越来越大,应用对Web服务器提出了更高的QoS(Quality of Service,服务质量)要求,特别是,要求其处理数量不断变更的用户访问,它们提出大量并发请求,并具有不同的QoS需求等.如何提高Web服务器QoS性能指标已成为当今研究的一大热点问题.本文提出一种成比例延时差异服务的异构Web服务器集群模型,该模型采用[M/M/1]:[∞/∞/FCFS]队列模型刻划集群中各结点请求队列的请求到达和服务过程;在此基础上,提出两种基于反馈控制机制的请求派发自适应修正算法,每种算法均实现了相应的请求选择和派发策略.实验数据表明,本文所提出模型是适用于异构Web服务器集群的,两种请求派发自适应修正算法均能使异构Web服务器集群获得较好的服务质量(QoS)性能,具有较好的理论价值和应用前景.展开更多
The manner of permission management in Role-Based Access Control is similar to the actual one in application fields, and it greatly simplifies system management. How to define and manage hundreds of permissions, roles...The manner of permission management in Role-Based Access Control is similar to the actual one in application fields, and it greatly simplifies system management. How to define and manage hundreds of permissions, roles,users and relations among them ( all are called RBAC special framework in this article)in large systems is one key problem that models for RBAC must resolve. This article studies the management of RBAC special frameworks, takes the management relations among roles into frameworks, and puts forward Management-Enhanced Model for RBAC. Special frameworks created according to this model are very similar to the management structures in application fields, and can manage themselves. This model also supports dynamic maintenance of management formwork while it is working.展开更多
文摘The Mobile Agent is thought to be the popular computing model for the next generation's distributed sys-tem. The mobile agent has the following key features: autonomy, collaboration, security and especially mobility. Agood communication model for mobile agents cooperation is also necessary. In this article, after describing the maincommunication mechanisms, we analyze the methods to solve Agent Tracking and Communication Failure and makeclassification. We also propose a reliable and efficient mechanism named MEFS which uses Detecting methods andthen analyze its performance by giving the experimental data at the end.
文摘With the development of computer network, Biometrics, as a kind of information security techniques, is thought more and more of. Handwritten signature verification is an effective one. This paper introduces the design and implementation of an on-line handwritten signature verification system which is based on dynamic programming matching algorithm and give a brief evaluation of its performance. The performance of the system is satisfying according to the experiment.
文摘以往的包装器主要针对仅含有一个数据块的Web页面，而对含有多个信息块的Web页面，简称MIB(Multiple Information Block), Web页面无法处理。该文提出了一个新的抽取规则，结合了基于文档结构的抽取规则和基于特征Pattern匹配的抽取规则的优点，能够有效地抽取MIB Web页面中的信息。
文摘随着Internet上信息量的飞速增长,成千上万的网上文档需要分类以方便用户的浏览和获取。因此文档的自动分类工作已经越来越受到重视,一些相应的分类方法也应运而生。但其中很少有涉及到"层次化"的分类领域,且绝大多数方法仅仅返回单个分类结果。文中,我们提出了一种新的文档自动分类方法:MRHC(Multicategory ReturnedAlgorithmforHierarchicalClassification)。该方法着眼于层次化的分类技术,并在适当的情况下为文档返回多个分类结果。该方法中结合了特征削减和增量学习技术以便提高分类性能。最后,为了更加准确、客观的评价分类结果,提出了一种新的评估方法:LEP(Length of Error Path)。实验结果表明,提出的分类方法响应时间短,分类准确度高,具有较强的实用性。
文摘随着Internet的迅速发展,Web服务在满足数量巨大而日益增长的社会需求中所起的作用越来越大,应用对Web服务器提出了更高的QoS(Quality of Service,服务质量)要求,特别是,要求其处理数量不断变更的用户访问,它们提出大量并发请求,并具有不同的QoS需求等.如何提高Web服务器QoS性能指标已成为当今研究的一大热点问题.本文提出一种成比例延时差异服务的异构Web服务器集群模型,该模型采用[M/M/1]:[∞/∞/FCFS]队列模型刻划集群中各结点请求队列的请求到达和服务过程;在此基础上,提出两种基于反馈控制机制的请求派发自适应修正算法,每种算法均实现了相应的请求选择和派发策略.实验数据表明,本文所提出模型是适用于异构Web服务器集群的,两种请求派发自适应修正算法均能使异构Web服务器集群获得较好的服务质量(QoS)性能,具有较好的理论价值和应用前景.
文摘The manner of permission management in Role-Based Access Control is similar to the actual one in application fields, and it greatly simplifies system management. How to define and manage hundreds of permissions, roles,users and relations among them ( all are called RBAC special framework in this article)in large systems is one key problem that models for RBAC must resolve. This article studies the management of RBAC special frameworks, takes the management relations among roles into frameworks, and puts forward Management-Enhanced Model for RBAC. Special frameworks created according to this model are very similar to the management structures in application fields, and can manage themselves. This model also supports dynamic maintenance of management formwork while it is working.
