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Proceedings 22nd International Conference on Distributed Computing Systems Workshops最新文献

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QoS control of multimedia communication over wireless network 无线网络多媒体通信的QoS控制
Pub Date : 2002-11-07 DOI: 10.1109/ICDCSW.2002.1030791
Kazuo Takahata, Norihiko Uchida, Y. Shibata
In this paper QoS control of a real-time multimedia communication system under heterogeneous environments of wired and wireless networks is proposed. In our suggested system, as channel coding the FEC (forward error correction) method with Reed-Solomon coding is introduced to reduce the packet error rate on the wireless network. On the other hand, as source coding, transcoding methods including transformation of various video codings such as M-JPEG, MPEG and Quicktime, control of Q-factor within a frame, frame rate and color depth are introduced to maintain the required QoS, particularly the end-to-end throughput. The increases of the required bandwidth by redundant packet addition with FEC can be suppressed by the transcoding functions while the packet error rate is reduced to the accepted value. In order to verify the functionality and the efficiency in our suggested system, numerical simulation was carried out. As a result, our suggested system by combination of transcoding and FEC could correct the packet error rate with an order of 10/sup 9/ while maintaining the frame rate and the amount of data transform constant.
本文提出了有线和无线异构环境下实时多媒体通信系统的QoS控制。在我们提出的系统中,为了降低无线网络上的数据包错误率,引入了前向纠错(FEC)方法和Reed-Solomon编码作为信道编码。另一方面,作为源编码,引入转码方法,包括M-JPEG、MPEG和Quicktime等各种视频编码的转换,帧内q因子的控制,帧速率和颜色深度,以保持所需的QoS,特别是端到端吞吐量。通过转码功能可以抑制FEC增加冗余包所增加的带宽,同时将包错误率降低到可接受的值。为了验证系统的功能和效率,进行了数值仿真。结果表明,我们提出的转码与FEC相结合的系统可以在保持帧率和数据转换量不变的情况下,以10/sup /的数量级来纠正数据包错误率。
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引用次数: 9
Quantifying effect of network latency and clock drift on time-driven key sequencing 网络延迟和时钟漂移对时间驱动密钥排序的量化影响
Pub Date : 2002-07-02 DOI: 10.1109/ICDCSW.2002.1030745
G. Xie, C. Irvine, T. Levin
Time-driven key sequencing (TKS) is a key management technique that synchronizes the session key used by a set of communicating principals based on time of day. This relatively low cost method of session key synchronization has been used in specialized distributed systems with low-end communicating devices where sessions are sparse and each session spans a short time period comprising a small number of messages. In this paper, we describe how TKS may be useful in several scenarios involving high speed computer networks. More importantly, we present a performance model of TKS and conduct a detailed analysis to determine the impact of clock drift and network latency on the required key refresh rate. We give the exact conditions for determining the range of adequate key refresh rates, and demonstrate that the derived conditions are sufficient to ensure that data are both protected and deliverable. Interestingly, these conditions may be used to obtain a key refresh rate that can tolerate a maximum amount of clock drift after other parameters in the system are fixed.
时间驱动密钥排序(TKS)是一种密钥管理技术,它根据一天中的时间同步一组通信主体使用的会话密钥。这种相对低成本的会话密钥同步方法已用于具有低端通信设备的专用分布式系统,其中会话稀疏,每个会话跨越由少量消息组成的短时间周期。在本文中,我们描述了TKS如何在涉及高速计算机网络的几种场景中发挥作用。更重要的是,我们提出了TKS的性能模型,并进行了详细的分析,以确定时钟漂移和网络延迟对所需密钥刷新率的影响。我们给出了确定适当的键刷新率范围的确切条件,并证明了导出的条件足以确保数据既受保护又可交付。有趣的是,这些条件可以用来获得一个键刷新率,该刷新率可以在系统中的其他参数固定后容忍最大数量的时钟漂移。
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引用次数: 5
LifeMinder: a wearable healthcare support system using user's context LifeMinder:可穿戴式医疗保健支持系统
Pub Date : 2002-07-02 DOI: 10.1109/ICDCSW.2002.1030864
Kazushige Ouchi, Takuji Suzuki, M. Doi
Introduces a prototype of wearable healthcare support system 'LifeMinder', which consists of a wristwatch-shaped wearable sensor module and a personal digital assistant (PDA). The wearable sensor module, equipped with sensors of accelerometer, pulse meter thermometer galvanic skin reflex (GSR) electrodes and Bluetooth module to communicate with the PDA, monitors the user context: health conditions, movements and behaviors. The system uses this information to guide the user in daily self-care in real time. Diet care and exercise care are especially significant to prevent the "lifestyle-related disease". The authors developed algorithms to recognize the user movement from wrist motion and to detect the beginning of a meal from pulse rates and GSR values. The accuracy of both algorithms is about 90%.
介绍了可穿戴医疗支持系统LifeMinder的原型,该系统由一个手表形状的可穿戴传感器模块和一个个人数字助理(PDA)组成。可穿戴传感器模块配备了加速度计、脉搏计、温度计、皮肤电反射(GSR)电极和蓝牙模块,用于与PDA通信,监测用户的环境:健康状况、运动和行为。系统利用这些信息实时指导用户进行日常的自我护理。饮食保健和运动保健对预防“生活方式相关疾病”尤为重要。作者开发了一种算法,可以从手腕运动中识别用户的运动,并从脉搏率和GSR值中检测用餐的开始。两种算法的准确率都在90%左右。
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引用次数: 77
Mobility of context for project teams 项目团队上下文的移动性
Pub Date : 2002-07-02 DOI: 10.1109/ICDCSW.2002.1030801
S. Dustdar
In the last decade, bureaucratic organizational hierarchies increasingly have been replaced with flatter organizational forms, bringing together people from different disciplines to form project teams within and between organizations. Distributed project teams often are self-configuring networks of mobile and "fixed" people, devices, and applications. They are the natural next step in the evolution of distributed computing, after client-server, Web-based, and peer-to-peer computing. A newly emerging requirement is to facilitate not just mobility of content (i.e. to support a multitude of devices and connectivity modes) to project members, but also mobility of context (i.e. to provide traceable and continuous support of relationships between people, artifacts, and business processes). The contribution of this paper is to present the design goals, the architecture, and implementation of a system aiming at supporting mobility of context for project teams, enabling traceable and continuous support of associations (relationships) between people, artifacts, and business processes.
在过去的十年中,官僚的组织层级逐渐被扁平化的组织形式所取代,将来自不同学科的人聚集在一起,形成组织内部和组织之间的项目团队。分布式项目团队通常是自配置移动和“固定”人员、设备和应用程序的网络。它们是继客户机-服务器、基于web和点对点计算之后,分布式计算发展的自然下一步。一个新出现的需求是,不仅要促进内容对项目成员的移动性(例如,支持多种设备和连接模式),还要促进上下文的移动性(例如,为人员、工件和业务流程之间的关系提供可跟踪和持续的支持)。本文的贡献在于展示了一个系统的设计目标、体系结构和实现,该系统旨在支持项目团队上下文的移动性,支持人员、工件和业务过程之间的关联(关系)的可跟踪和持续支持。
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引用次数: 7
A versatile event-based communication model for generic distributed interactions 通用分布式交互的通用的基于事件的通信模型
Pub Date : 2002-07-02 DOI: 10.1109/ICDCSW.2002.1030818
F. Peschanski
Event-based communication models provide interesting properties for distributed systems such as asynchronism and type-based selection mechanisms. The Comet middleware we developed proposes such an event-based communication model as foundation. From this canonical model, we show how to build more conventional bidirectional and synchronous interactions with extended features such as implicit type-based multicast or asynchronous operationalization. Furthermore, we demonstrate the use of the lower-level asynchronous model to develop highly flexible distributed services. We illustrate this idea with a publish/subscribe protocol that can be dynamically reconfigured to match various requirements: type-based or content-based filtering semantics, peer-to-peer or mediator-based configurations.
基于事件的通信模型为分布式系统提供了一些有趣的属性,比如异步性和基于类型的选择机制。我们开发的Comet中间件提出了这样一个基于事件的通信模型作为基础。从这个规范模型出发,我们将展示如何使用扩展特性(如隐式基于类型的多播或异步操作化)构建更传统的双向和同步交互。此外,我们还演示了如何使用低级异步模型来开发高度灵活的分布式服务。我们用一个发布/订阅协议来说明这个想法,该协议可以动态地重新配置,以匹配各种需求:基于类型或基于内容的过滤语义、点对点或基于中介的配置。
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引用次数: 9
Interaction of all IP mobile Internet devices with networked appliances in a residential home 住宅中所有IP移动互联网设备与联网设备的交互
Pub Date : 2002-07-02 DOI: 10.1109/ICDCSW.2002.1030852
J. Latvakoski, P. Pääkkönen, D. Pakkala, A. Tikkala, J. Remes, P. Välitalo
This paper deals with the interaction of all IP mobile Internet devices with networked appliances in a residential home. Two novel mechanisms are described and demonstrated: pointing as an indication of user interest, and user interface loading from the home appliance to a mobile Internet device. The user pointing action is used as a source to both collecting the context information of the user, and triggering the execution of the user interface loading procedure. The provided mechanisms are described in the form of a use scenario, and implemented using a session initiation protocol (SIP) and an open service gateway (OSGi) platform.
本文研究了住宅中所有IP移动互联网设备与联网设备的交互。描述并演示了两种新的机制:指向作为用户兴趣的指示,以及从家用电器加载到移动互联网设备的用户界面。用户指向操作用作收集用户上下文信息和触发用户界面加载过程执行的源。所提供的机制以使用场景的形式进行描述,并使用会话发起协议(SIP)和开放服务网关(OSGi)平台实现。
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引用次数: 15
A universal messaging service for users and groups 用于用户和组的通用消息传递服务
Pub Date : 2002-07-02 DOI: 10.1109/ICDCSW.2002.1030802
Fredrik Wilhelmsen
Communication is the basis of all cooperation. Messaging is an important form of communication. A universal messaging service (UMS) developed by Telenor Mobil is presented. Features and architecture for UMS are presented. Possible development directions for UMS are discussed, including more sophisticated support for groups and group awareness.
沟通是一切合作的基础。消息传递是一种重要的通信形式。介绍了Telenor Mobil开发的通用消息服务(UMS)。介绍了UMS的特点和体系结构。讨论了UMS可能的发展方向,包括对群体和群体意识的更复杂的支持。
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引用次数: 0
PFTPD: an FTP proxy system to assure the freshness of files PFTPD:保证文件新鲜度的FTP代理系统
Pub Date : 2002-07-02 DOI: 10.1109/ICDCSW.2002.1030748
J. Funasaka, Masato Bito, K. Ishida
As more software is being developed and distributed via the Internet, the number of accesses to file servers, such as FTP servers or WWW servers, is increasing. To reduce concentrated access to the original file server, mirror servers which have the same directories and files as the original server stores have been introduced. However, inconsistency among mirror servers and the original server is often observed because of transfer latency, traffic congestion on the network, and management policy of the mirror servers. Hence, we develop an intermediate FTP proxy server system PFTPD (Proxy FTP Daemon) which guarantees the freshness of files as well as dispersal of the access concentrated on the original FTP server. We found that the proposed system can disperse accesses to the mirror servers with a little overhead. This technology can assure that files are the latest version and adapt to heterogeneous network environments such as the Internet.
随着越来越多的软件通过因特网开发和分发,访问FTP服务器或WWW服务器等文件服务器的次数也在增加。为了减少对原始文件服务器的集中访问,引入了具有与原始服务器存储相同目录和文件的镜像服务器。但是,由于传输延迟、网络流量拥塞和镜像服务器的管理策略等原因,镜像服务器与原始服务器之间经常会出现不一致的情况。因此,我们开发了一个中间FTP代理服务器系统PFTPD (proxy FTP Daemon),它既保证了文件的新鲜度,又分散了原FTP服务器的访问。我们发现,所提出的系统可以以很小的开销分散对镜像服务器的访问。该技术可以保证文件是最新版本,并适应Internet等异构网络环境。
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引用次数: 4
Mobile agent-based transcoding functions 基于移动代理的转码功能
Pub Date : 2002-07-02 DOI: 10.1109/ICDCSW.2002.1030760
K. Hashimoto, Y. Shibata, N. Shiratori
We earlier proposed a flexible multimedia system (FMS) that is able to guarantee end-to-end QoS according to priority of parameters and consensus policy. On interconnected computer networks, we can communicate with each other using real-time media such as audio and video by distributed multimedia system that can integrate various realtime and discrete media data. The multimedia system is required to realize end-to-end quality of service (QoS) guarantee functions. When users communicate with each other on interconnected different bandwidth networks, if the system can use translator or mixer functions that are defined by RTP it will be able to guarantee more flexible QoS. In addition, the system is able to organize various multimedia services dynamically. The FMS is a mobile agent based system, therefore the system will be able to organize a translator or mixer dynamically. In this paper we discuss QoS guarantee functions using mobile agent and re-design our prototype system to use mobile transcoding functions for flexible multimedia communication.
我们提出了一种灵活的多媒体系统(FMS),它能够根据参数的优先级和一致性策略来保证端到端的QoS。在相互连接的计算机网络上,通过分布式多媒体系统集成各种实时和离散的媒体数据,我们可以利用音频和视频等实时媒体相互通信。多媒体系统需要实现端到端的QoS (quality of service)保障功能。当用户在相互连接的不同带宽网络上进行通信时,如果系统可以使用RTP定义的translator或mixer功能,则可以保证更灵活的QoS。此外,该系统还能动态组织各种多媒体服务。FMS是一个基于移动代理的系统,因此该系统将能够动态地组织翻译器或混音器。本文讨论了基于移动代理的QoS保证功能,并重新设计了原型系统,利用移动转码功能实现灵活的多媒体通信。
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引用次数: 2
TWSAPI: a generic teamwork services application programming interface TWSAPI:一个通用的团队服务应用程序编程接口
Pub Date : 2002-07-02 DOI: 10.1109/ICDCSW.2002.1030796
E. Kirda, G. Reif, H. Gall, P. Fenkam
One of the problems faced by large, global organizations and enterprises is to effectively enable their employees to collaborate across locations. People need collaborative work support while they are on the move and have to share business documents and know-how. Although much work has been done in the area of computer supported collaborative work (CSCW) to date, supporting mobility is only recently receiving attention. Hence, most of the existing approaches do not deal with emerging mobile teamwork requirements such as locating business documents and expertise through distributed searches, advanced subscription and notification, community building, and mobile information sharing and access. Furthermore, existing applications and approaches are usually difficult to customize to business-specific processes and requirements. The Mobile Teamwork Infrastructure for Organizations Networking (MOTION) system addresses these requirements and provides a generic teamwork services application programming interface (API), TWSAPI, that can be used to build organization-specific collaborative applications. In this paper we give an overview of the MOTION TWSAPI and illustrate its usage in building an application that provides document review support.
大型全球性组织和企业面临的问题之一是有效地使员工能够跨地点协作。人们在移动中需要协作工作支持,并且必须共享业务文档和专有技术。尽管迄今为止在计算机支持的协同工作(CSCW)领域已经做了很多工作,但支持移动性只是最近才受到关注。因此,大多数现有方法不能处理新兴的移动团队需求,例如通过分布式搜索、高级订阅和通知、社区建设以及移动信息共享和访问来定位业务文档和专业知识。此外,现有的应用程序和方法通常很难针对特定于业务的流程和需求进行定制。针对组织网络的移动团队合作基础设施(MOTION)系统解决了这些需求,并提供了一个通用的团队合作服务应用程序编程接口(API), TWSAPI,可用于构建特定于组织的协作应用程序。在本文中,我们概述了MOTION TWSAPI,并说明了它在构建提供文档审阅支持的应用程序中的用法。
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引用次数: 4
期刊
Proceedings 22nd International Conference on Distributed Computing Systems Workshops
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