关键词： 无线网卡   无线接入   无线协议   选购指南   网络速度   硬件产品   市场新宠   移动计算   无线局域网   数据传输  

摘要： 随着硬件产品价格的降低,无线网卡将会被越来越多的人所使用。2002年被称为“无线移动计算年”,以“移动、计算”为卖点的无线局域网设备已成为市场新宠。选购无线接入卡时,一定要谨慎,花钱花得恰到好处。无线网卡发展到今天,支持IEEE 802.11b无线协议的无线网卡前景最为看好。因此,选择无线网卡时对无线网卡是否支持该协议要多加留意。由于各种原因,网络速度不可能恒定不变,而且各个网卡的传输速度不尽相同,所以支持较多的传输速率对于数据传输的稳定性、网络的稳定性以及网卡的兼容性就有较大的意义了。

关键词： RS   移动计算   规则提取   仿真   决策规则   移动通信   数据挖掘   无线网络  

摘要： RS(RoughSet)方法是一种处理不精确或不完整信息的强有力数学工具。该文首先提出了基于RS在移动计算环境中进行数据挖掘的系统模型,并给出了对数据进行规则提取的具体算法,最后给出了仿真程序和应用结果。

关键词： 反垃圾邮件   邮件服务器   卢麟   政策法规   地址信息   移动计算   国家各部委   国家知识产权局   标准贯彻   信息管理  

摘要： 2003年中国反垃圾邮件研讨会召开8月15日,中国互联网协会在北京举办了"2003年中国反垃圾邮件研讨会"。来自中国互联网协会反垃圾邮件协调小组的成员单位、中国互联网协会会员单位和各界关心反垃圾邮件事业的人士参加了本次会议。与会代表从政策法规、管理、

关键词： 移动数据库   移动代理   移动计算环境   客户机缓存管理   Aglet Workbench  

摘要： 该文对移动数据库中客户机缓存管理进行了深入的研究,首先讨论了客户缓存管理的缓存粒度、缓存替换策略,一致性解决方案,随后提出了一种移动子集描述的新方法CCD.在给出的移动子集描述CCD的基础上,提出了一个适应于移动计算环境的客户缓存管理的模型,详细描述了三种状态,并给出了支持客户端更新操作的一致性算法.为验证该模型的性能,该文首先实现了一个移动计算环境的模拟程序MCE_SP,该模拟程序能很好地模拟移动计算环境中的断接状况;然后在IBM的移动代理平台Aglet Workbench上实现了一个客户端缓存管理器的原型CCM_BM;最后在模拟的实验环境下,通过实验验证了该原型在支持断接操作以及响应时间方面都具有较好的性能.该文的研究内容将移动代理技术引入到移动数据库的客户机缓存管理的领域,对此作了有益的尝试,具有一定的创新性和前瞻性.

关键词： distributed systems   fault-tolerance   mobile computing systems   message logging   asynchronous recovery  

摘要： This paper presents an efficient recovery scheme to provide fault-tolerance for the mobile computing systems. The proposed scheme is based on the message logging and the independent checkpointing, and for the efficient management of the recovery information, such as checkpoints and message logs, the movement-based scheme is suggested. The mobile host carrying its recovery information to the nearby mobile support station can recover instantly in case of a failure. However, the support stations visited by he mobile host may have to experience the high failure-free execution cost for transferring the recovery information and accessing the stable storage. On the other hand, the recovery cost can be too high, if the recovery information remains dispersed over a number of mobile support stations. The movement-based scheme considers both of the failure-free execution cost and the failure-recovery cost. Hence, while a mobile host moves within a certain range, the recovery information of the mobile host remains at the support stations where the information was first saved. However, if the mobile host moves out of the range, it transfers the recovery information into the nearby support station. As a result, the scheme can control the transfer cost as well as the recovery cost. The performance of the proposed scheme is evaluated with extensive simulation, study. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： genetic algorithms   location management   mobile computing   wireless networks  

摘要： With the increase in global wireless communication, there is a need for. efficient network management strategies. Location management in a mobile network involves keeping track of mobile host (MH) cell locations. MHs perform location updates to inform the network of their location. When a call arrives for an MH, the network uses its last known cell location and a paging strategy to find that host. Current location management techniques do not consider host-mobility patterns or call arrival rates. This paper describes a selective update strategy that is modeled on the characteristics of a network, such as, topology, host mobility patterns and connection request rates. Then, a genetic algorithm is used to solve the location management problem that involves the search of a large solution space. The aim of the work is to determine whether genetic algorithms can be applied successfully to solve this problem, and to evaluate their efficiency in solving this class of optimization problems. Results from the selective update strategy show improvements over alternative algorithms. The location management optimization problem is shown to be well adapted to the workings of the genetic algorithm. The proposed solution also saves power, processing time, and network bandwidth. (C) 2002 Elsevier Science (USA). All rights reserved.

关键词： mobile computing terminals   law enforcement   communication   information   time   deterrence   job satisfaction  

摘要： A major metropolitan police department in the Northeast recently began using mobile-computing terminals (MCTs). This research explores how MCTs have improved critical factors that affect the work environment of the officers in the department, particularly related to deterrence and job satisfaction. A model for investigation is developed and tested using a survey instrument administered to officers using the MCTs. We find that MCTs have enabled better communication among officers and have increased the availability of information, both of which are found to have a significant positive impact on the officers' job satisfaction. Savings in time from plate checks are found to have a significant impact on deterrence. However, though the availability of information from MCTs has a positive impact on deterrence, the relationship is not very significant.

关键词： 战略合作伙伴   CASIO   移动计算  

关键词： 中国网通   移动计算   英特尔   中国网络通信有限公司   计算应用  

摘要： 近日,英特尔有限公司与中国网络通信有限公司宣布双方将通过一系列的技术及市场活动扩大在公共热点(hotspot)地区的无线局域网的部署,为商务用户提供完整的无线解决方案,共同推广基于英特尔~((R))迅驰移动计算技术的全新移动计算应用模式。 根据此次的联合推广计划,双方将以英特尔即

关键词： 英特尔   消费者   迅驰   CPU   移动计算  

摘要： 1月9日,英特尔在北京、上海、深圳等13个城市同时举行新闻发布会,推出第一个全新移动计算技术品牌——Cen-trino,即英特尔“迅驰”移动计算技术。据了解,迅驰品牌代表的是一类技术,整套技术包括之前开发的代号为Banias的CPU、Calexico芯片组以及IEEE 802.11a/b(Wi-Fi)无线网络功能。这是英特尔第一次将一系列技术完全整合到一个统一商标。“迅驰的意义就像索尼当时推出的随身听的意义一样,迅驰的推出代表新一