A Framework for Providing User Level Quality of Service Guarantees in Multi-Class Rate Adaptive Systems

The problem of channel sharing by rate adaptive streams belonging to various classes is considered. Rate adaptation provides the opportunity for accepting more connections by adapting the bandwidth of connections that are already in the system. However, bandwidth adaptation must be employed in a careful manner in order to ensure that (a) bandwidth is allocated to various classes in a fair manner (system perspective) and (b) bandwidth adaptation does not affect adversely the perceived user quality of the connection (user quality). The system perspective aspect has been studied earlier. This paper focuses on the equally important user perspective. It is proposed to quantify user Quality of Service (QoS) through measures capturing short and long-term bandwidth fluctuations that can be implemented with the mechanisms of traffic regulators, widely used in networking for the purpose of controlling the traffic entering or exiting a network node. Furthermore, it is indicated how to integrate the user perspective metrics with the optimal algorithms for system performance metrics developed earlier by the authors. Simulation results illustrate the effectiveness of the proposed framework.

The Active XML project: an overview

This paper provides an overview of the Active XML project developed at INRIA over the past five years. Active XML (AXML, for short), is a declarative framework that harnesses Web services for distributed data management, and is put to work in a peer-to-peer architecture. The model is based on AXML documents, which are XML documents that may contain embedded calls to Web services, and on AXML services, which are Web services capable of exchanging AXML documents. An AXML peer is a repository of AXML documents that acts both as a client by invoking the embedded service calls, and as a server by providing AXML services, which are generally defined as queries or updates over the persistent AXML documents. The approach gracefully combines stored information with data defined in an intensional manner as well as dynamic information. This simple, rather classical idea leads to a number of technically challenging problems, both theoretical and practical. In this paper, we describe and motivate the AXML model and language, overview the research results obtained in the course of the project, and show how all the pieces come together in our implementation. The first and third authors were partially funded by the European Project Edos. Work done when the second and third authors were at INRIA. Work done when the second and third authors were at INRIA.     

Report on the 2nd International Summer School on Network and Service Management (ISSNSM’08)

This report summarizes the 2nd International Summer School on Network and Service Management (ISSNSM’08), which was held at the Communication Systems Group (CSG) of the Department of Informatics (IFI), University of Zurich, Switzerland, on 2–6 June 2008. Supported by the European FP6 Network of Excellence for the Management of Internet Technologies and Complex Services (EMANICS), the ISSNSM presented within 5 days eight different topics, covering the areas of (1) security, (2) virtualization and simulations, and (3) network monitoring and management. All of these run for a full or half day, including a short theoretical introduction and larger practical lab course components, respectively.

采用Browser/Server架构模式的MES系统

为了解决某轮胎企业管理中存在控制系统孤立的问题,在企业原有的生产过程控制系统基础上设计了基于B/S体系结构的MES系统,并在系统中利用Hibernate技术实现数据对象的持久化,有效地避免了采用传统方法带来的软件系统风险。研究结果表明,该系统能在企业内部的信息化系统与过程控制系统传送信息,优化从订单开始到产品制成的整个生产过程,有效规范管理制度,提高管理和决策效率,从而更好地满足轮胎企业的需求。     

基于嵌入式Web的发射机远程监控系统

为了保证广播电视节目的安全稳定播出,需要对广播电视发射机运行状态进行远程监测和控制。基于Web的广播电视发射机远程监控具有很强的适应性和开放性,符合现代远程监控系统的要求。讨论了基于Web服务器的广播电视发射机远程监控的2种方案,给出了基于嵌入式Web的广播电视发射机远程监控系统体系结构和系统功能,介绍了以SX52BD微处理器为核心的嵌入式Web服务器的软硬件设计与实现。针对系统功能的要求,着重对软件设计进行了分析,并提出利用Java Applet和Socket技术在Web页面上实现监控计算机与嵌入式Web服务器进行动态交互的具体方法。系统应用于某电视发射台发射机的远程监控,试运行效果良好。     

Process-context aware matchmaking for web service composition

Web service composition can help software developer design more powerful and flexible applications according to requirements of enterprise. But during compositing, how to discover suitable web services is a critical problem in design and implementing application-oriented web service technologies. The traditional keyword-based matchmaking approach is difficult to help developer to find suitable service. Current researches find that to attaching semantics to each registered service can help improve the precision of matchmaking. The improvement can help developer find more suitable service for business process. This paper proposes a novel approach of semantics-based matchmaking, which is named process-context aware matchmaking. The process-context aware matchmaking discovers the suitable service during web service composite modeling. During matchmaking, the approach utilizes not only semantics of technical process but also that of business process of a registered service, thus further improving the precision of matchmaking. We integrate the process-context aware matchmaking with business-process-driven web service composition in an integrated development environment based on Eclipse. The performance evaluation shows that performance overhead of this novel approach is acceptable.     

Navigation system for an autonomous robot using an ocellus camera in an indoor environment

Autonomous and mobile robots are being expected to provide various services in human living environments. However, many problems remain to be solved in the development of autonomous robots that can work like humans. When a robot moves, it is important that it be able to have self-localization abilities and recognize obstacles. For a human, the present location can be correctly checked through a comparison between memorized information assuming, it is correct, and the present situation. In addition, the distance to an object and the perception of its size can be estimated by a sense of distance based on memory or experience. Therefore, the environment for robotic activity assumed in this study was a finite-space such as a family room, an office, or a hospital room. Because an accurate estimation of position is important to the success of a robot, we have developed a navigation system with self-localization ability which uses only a CCD camera that can detect whether the robot is moving accurately in a room or corridor. This article describes how this system has been implemented and tested with our developed robot.     

Web service-oriented manufacturing resource applications for networked product development

Networked manufacturing enterprises need a wider support from external manufacturing resources. This paper proposes a promising service to use web-based extended manufacturing resources for product development. The system architecture and enabling techniques are presented. Manufacturing resources on the web are achieved through focused crawling and semantic web technologies. These resources are further utilized through web-based resource repositories such as part libraries. The major modules of web-based manufacturing resource service are encapsulated with web services. A case study of mould product development is presented, which promotes the networked collaborative design and manufacturing processes. Some preliminary results indicate the feasibility and scalability of web-based manufacturing resource services for networked manufacturing.