关键词： Computer networks  

摘要： With the advent of mobile computing devices and cheap location sensing systems, location information has become an important resource both for mobile and 'desktop users'. In this paper, we describe some key concepts that a scaleable ubiquitous location service should be based on. Firstly, we show how such a service can accommodate multiple location sensing systems. Secondly, we discuss hierarchy-based access control policies as a flexible and powerful mechanism to protect users' privacy. Thirdly, we address some issues concerning the visualization of location information. Copyright (C) 1996 Elsevier Science Ltd

关键词： 便携机高度的可移动性可能危及磁盘驱动器和其中所存储的数据.有鉴于此   Seagate把许多改进的技术和新发明应用于它的2.5英寸磁盘驱动器Marathon系列   为关注数据可靠性的便携机用户提供高效的解决方案.   机械方面的改进  

摘要： 便携机高度的可移动性可能危及磁盘驱动器和其中所存储的数据。有鉴于此,Seagate把许多改进的技术和新发明应用于它的2.5英寸磁盘驱动器Mara山on系列,为关注数据可靠性的便携机用户提供高效的解决方案。- 土n王浦.七.尺石白台p行考挂冲击而移位的可能性。 电学方面的改进 s“lg（共1页)

关键词： mobile computing   distributed algorithms   two tier principle  

摘要： Mobile computing represents a new paradigm that aims to provide continuous network connectivity to users regardless of their location. To realize this aim, it is necessary to design distributed algorithms that explicitly account for host mobility and the physical constraints associated with such networks. This paper presents an operational system model for explicitly incorporating the effects of host mobility with appropriate cost measures. It points out the drawbacks of executing distributed algorithms in this model that are not explicitly designed for mobile hosts. To overcome the resource constraints of mobile hosts, we propose a two tier principle for structuring distributed algorithms for mobile hosts so that the computation and communication requirements of an algorithm are borne by the static hosts to the extent possible. In addition, since location of a mobile host could change after initiating a distributed computation and before receiving the result, location management of mobile participants needs to be explicitly integrated with algorithm design.

关键词： mobile computing   quality of service   seamless service guarantees   graceful degradation  

摘要： With rapid technological advances being made in the area of wireless communications it is expected that, in the near future, mobile users will be able to access a wide variety of services that will be made available over future high-speed networks. The quality of these services in the high-speed network domain can be specified in terms of several QoS parameters. In this paper we identify two new QoS parameters unique to the mobile environment - guarantee of seamless service and ensuring graceful degradation of service in situations where user demands exceed the network's capacity to satisfy them. A network architecture and a suite of transport level services are proposed that enables these QoS parameters to be satisfied.

关键词： Agents   ARCHITECTURE   Building construction   Consumers   Building systems   Data structures   Communication Research   Mobile Computing   Mobile   Legal Services   user data  

摘要： This paper describes a novel mobile virtual-distributed system architecture for supporting global mobile computing and communications. The principal contribution of this paper is to innovatively apply virtual memory concepts to mobile systems by deploying mobile-floating agents to de-couple services and resources from the underlying network and allow them to move around following their mobile users. The mobile-floating agents maintain data structures associated with a mobile user. By combining the mobile-floating agent functions with a predictive mobility management algorithm and location-aware caching and prefetching, services and user data structure are pre-connected and pre-assigned at the locations to which the user is moving. Thus, the users can maintain their data structures or immediately receive service with virtually the same efficiency as at the previous location.

关键词： Satisfaction   transport system   Mobile Computing   High-speed networks   Legal Services   protocols   CARRIER SYSTEM   Quality of service  

摘要： With rapid technological advances being made in the area of wireless communications it is expected that, in the near future, mobile users will be able to access a wide variety of services that will be made available over future high-speed networks. The quality of these services in the high-speed network domain can be specified in terms of several QOS parameters. In this paper we identify a new QOS parameter for the mobile environment, called loss profiles, that ensures graceful degradation of service (for applications that can tolerate loss) in situations where user demands exceed the network's capacity to satisfy them. A new transport sub-layer is proposed that efficiently implements this new QOS parameter. We also show bow this protocol can be easily incorporated into existing proposals for high-speed network transport layer protocols and into the MPEG-2 Transport System.

关键词： 移动系统   路径算法   计算机通信  

摘要： 分布式系统中移动计算机的引入带来了一系列新的问题．传统的路径算法已不能适应这类系统．本文提出了一种移动系统通信的路径算法，该方法具有高效、坚定及可扩充等特征．

关键词： 笔记本   MB   硬盘驱动器   温盘机   磁盘驱动器   便携机   电池寿命   网络适配卡   触摸板   桌面系统   以太网适配器   跟踪球   轨迹球   ROM   移动计算  

摘要： 当你走过座舱的过道,总有一种无法抗拒的力量使你紧盯着奔波者的笔记本机,是不是?嗯…,大的彩色屏幕,音频插孔,甚至还有CD-ROM,你可能认为它一定很贵。你一定认为制造厂商不再为偶尔进行商业旅行的人们制造简朴实用的笔记本机,事实并非如此,的确并非如此。正当满足工业标准的、重6.5磅、售价＄3000的彩色笔记本机仍有生命力的时候,过去的一年已迎来了许多便携机,这些便携机有的重些有的轻些,有的较昂贵有的较便宜,有的功能更全面有的功能更简单。

关键词： 移动计算机   笔记本计算机   笔记本电脑   便携式计算机   记事本  

摘要： 漫谈移动计算机计玄龙随着信息技术的迅速发展，计算机亦显示出由桌面台式个人计算机向便携式移动计算机发展的喜人趋势。移动计算机大体上可分为笔记本计算机、袖珍型笔记本计算机、手提计算机、个人数据记事本及个人电子记事本等。其中，笔记本型计算机日新月异的发展对...

关键词： 笔记本电脑   个人电脑   零组件   桌上型电脑   美元   笔记本计算机   微型计算机   本位币   移动计算   自有品牌   计算机界   实践者  

摘要： 访台湾伦飞实业股份有限公司行销业务处副总经理林崇恺 笔记本电脑(Notebook)近年来已成为计算机产业界的热门产品。事实上,愈来愈多的消费者购买第一部电脑时,就已考虑笔记本电脑,而非传统的台式机(Desktop)。 笔记本电脑在台湾成为信息产业大国的过程中,也扮演着举足轻重的角色。据资策会市场情报中心资料显示,1995年台湾制造出口的笔记本电脑产值为33.39亿美元,产量为2592千台,世界市场占有率高达27％。 在这些璀璨的数字背后,当然有着许多人胼手胝足的努力。成立已达12年的伦飞公司即是一例,多年的努力,早已让伦飞电脑成为台湾笔记本电脑的领先厂商。是以OEM为主,以自有品牌在世界行销的例子可说是有如凤毛麟角,但伦飞选择了这条相当辛苦的道路。“自有品牌是需要长时间努力的投资。”林崇恺的深刻体验也反映了伦飞十年来的努力成果,目前伦飞的自有品牌部分占该公司的营业额竟高达20％左右,就台湾计算机界而言,实在是很不容易。“现在还在努力推广自有品牌的台湾个人电脑厂商,只剩宏基与伦飞了。”