DataWeb: customizable database publishing for the Web

The DataWeb project seeks to facilitate the querying and browsing of multimedia databases over a wide spectrum of networks and media. We developed an intelligent query facility that builds on the access paradigms supported by current hypertext-style Web applications and on decision support systems. This facility generalizes the basic navigation and abstraction mechanisms of these applications to make them extensible and scalable     

面向移动增值业务的数字版权管理方案

数字版权管理技术可以使内容提供商有效地控制他们的数字媒体对象的发布。它可以限制用户的操作,用户的使用次数,规定用户使用的起止时间或者提供预览功能等等。从介绍DRM的基本原理及功能出发,阐述了DRM的架构及其核心技术,最后介绍了如何把它运用在移动增值业务上的实现步骤。     

未来移动通信网的无线资源管理

自从数字移动通信网以前所未有的穿透力进入移动通信市场以来,人们对无线个人通信（ｗｉｒｅｌｅｓｓ ｐｅｒ—ｓｏｎａｌ ｃｏｍｍｕｎｉｃａｔｉｏｎｓ）的要求与日俱增。这也正是目前无线通信成为工业界主要焦点的源动力之一。随即,互联网的盛行促进了无线用户对高速数据传输的需求,据预测,无线高速多媒体的时代已不遥远。由此,我们可以在展望无线网发展的巨大潜力的同时,也意识到高用户量、高数据传输量和多种业务并存给未来无线网络带来的潜在挑战。解决这一问题不仅需要一流的设备,而且需要一流的无线资源管理技术。 目前国际…     

Max-utility wireless resource management for best-effort traffic

Due to the characteristics of wireless channels, utility-based resource management in wireless networks requires a set of mechanisms that are different from those for wireline networks. This paper explores in detail why and how the requirements are different. In particular, we analyze the wireless network performance to find out the scheduling algorithm that maximizes total utility of the system. Unlike previous studies, this paper focuses on scenarios in which wireless networks are not fully loaded and all of the users are best-effort data users, i.e., there is no streaming user. Our first key conclusion is that Kleinrock's Conservation Law provides a valuable means to accurately capture the perceived rates of best-effort users in such systems. The queueing analysis further indicates that, within periods during which channel conditions are stable for each user, albeit differ from user to user, the max-utility scheduling algorithm can be derived using queueing theorem and can be readily implemented in actual systems for utility functions that are of exponential or log format. When further taking into account the time-variant nature of wireless channel conditions, our simulation results demonstrate that dynamic weighted fair queueing, with weights adjusted according to the channel conditions, can achieve highly desirable performance with great flexibility.     

Network-assisted resource management for wireless data networks

We propose a framework for network-assisted radio resource management in wireless data networks. This type of radio resource management techniques offer implementation and capacity benefits compared to conventional, interference-measurement based, dynamic channel assignment (DCA) algorithms. The basic idea is to use interbase signaling to shift most of the burden of the resource allocation from the air interface to the backbone infrastructure. By exchanging channel assignment as well as other relevant information in real time through the backbone network, each base can calculate the impact of a resource assignment on the system. As a result, rapid interference measurements, which are typically needed to implement DCA schemes, are replaced by a limited amount of path loss measurements and the computation of interference conditions by the base stations. This significantly reduces the measurement and over-the-air signaling requirements, and can also provide an opportunity for a better optimization of the system performance. We focus on two specific algorithms: network-assisted least-interference-based dynamic packet assignment (NA-LI-DPA) and network-assisted dynamic packet assignment with throughput optimization (NA-DPA). NA-LI-DPA closely resembles a least-interference-based dynamic channel assignment algorithm, and NA-DPA attempts to further improve the overall system throughput. The algorithms, as defined, are appropriate for a best-effort data service, where the primary goal is to provide a higher throughput. However, it will be clear from the discussion that it is also feasible to alter the algorithms to optimize performance metrics other than throughput, e.g., to ensure a certain quality of service. We show through simulation that, for a system like enhanced general packet radio service (EGPRS) system, NA-DPA can provide a throughput that is 50% higher than random packet assignment, and 25% higher than that obtained by conventional DCA algorithms     

Virtual network resource management for next-generation networks

The multilayer structure of transport networks presents a key challenge in network resource management. In this article we present a virtual network approach to the management of transport network resources. We describe the approach as developed for the management of large-scale ATM networks and discuss the application to the next generation of multilayer transport networks.     

Analog neural optimization for ATM resource management

This paper addresses the issue of how to solve convex programming problems by analog artificial neural networks (ANNs), with applications in asynchronous transfer mode (ATM) resource management. We first show that the essential and difficult optimization problem of dimensioning the system of virtual subnetworks in ATM networks can be modeled as a convex programming task. Here the transformation of the problem into a convex programming task is a nontrivial step. We also present and analyze an analog ANN architecture that is capable of solving such convex programming tasks with time-varying penalty multipliers. The latter property makes it possible to perform quick sensitivity analysis with respect to the constraints in order to identify the bottleneck capacities in the network or those which give the highest return if we invest in extending them     

A resource management scheme for satellite networks

Satellite networks with dynamic bandwidth allocation capabilities (DBAC) are based on classical circuit switches. The DBAC payload allows changing the capacity of each connection dynamically, without tearing down and setting up the connection. An analysis of our DBAC satellite system performance shows a significant increase in the overall utilization factor of our system compared to a plain circuit switching solution     

A customizable QoS strategy for convergent heterogeneous wireless communications

This article proposes a general customizable QoS scenario for heterogeneous wireless access network technologies. The scenario provides robust and flexible QoS support by adapting the amount of resources reserved for the characteristics of the wireless channel, as well as automatic reconfiguration mechanisms of the multimedia encoding rate and error-resilient techniques to adapt to the dynamic mobile communication environment. Two new scenarios, adaptive FEC and MAC-Lite, are introduced to the proposed scheme. These enable a maximizing of the overall performance of the wireless network. The appropriate interfaces within the core network are described for performing end-to-end QoS, which deliver network meters and exchange QoS parameters with the proposed intra and inter cross-layer approaches, including context transfer during handover. Each part, extended by the proposed method can be configured by the application and be independently implemented. To evaluate the proposed scheme, the QoS components were integrated into a trial platform that was built and simulations were then performed. The results demonstrate that the communication quality was significantly improved     

Adaptive resource management in middleware: a survey

Current middleware technologies cannot meet the demands of new application areas, such as embedded and mobile systems, that require mechanisms for dealing with a changing environment. This article reviews several approaches for providing adaptive resource management for middleware. Current middleware technologies, such as the Common Object Request Broker Architecture (CORBA) and .NET (http://msdn.microsoft.com/net), mask system and network heterogeneity problems and alleviate the inherent complexity of distributed systems in many application areas. However, the recent emergence of new application areas for middleware, such as embedded systems, real-time systems, and multimedia, imposes challenges that few existing middleware platforms can meet. In particular, because they impose greater resource-sharing and dynamism demands, these application areas require more complex and sophisticated middleware. Resource sharing must be controlled and predictable to ensure that activities running on the same middleware instance have adequate resources.     

Network resource management for enterprise wide multimedia services

The support of broadband multimedia applications over an enterprise network poses a broad range of networking challenges for efficient resource management, intelligent switching, and access control for distributed information. We propose two server-based scheduling algorithms, with low computational complexity, to guarantee multimedia information synchronization at the destination, with minimum presentation delays and buffer requirements. We outline a communication framework, highlighting the issues and challenges faced by today's enterprise networks to support multimedia services. We describe the proposed connection establishment and resource allocation schemes in resource-constrained enterprise networks. The objective is to manage the limited resources of the network for maximum utilization. Towards this end we present a dynamic capacity allocation scheme to support connections for multiple users. Specifically, we show that the channel capacity allocation problem can be formulated as a quadratic programming problem. This allocation scheme is implemented at each intermediate switch to dynamically determine the capacity allocation. The effects of interswitch rate mismatch and network delay offset scheduling have also been incorporated in the management framework. In addition, we introduce the concept of route selection based on the requested network quality of service     

图书馆电子资源管理系统的开发

电子资源管理是现今图书馆面对的极具挑战性工作,截止至2010年课题中的图书馆的电子资源数量已经达到了数十TB,为进一步推进人力资源和图书馆集成化管理系统,及时让读者使用这些电子资源,提出了一套全新的电子资源管理系统,其目的是总结该馆以往的电子资源的管理经验,采取更先进的存储,Lucene索引技术及ASP.NET MVC 2.0框架,融合Web 2.0与Lib 2.0理念所创建的电子资源管理系统。采取了以上较先进的技术,解决了该馆大数据量电子资源的管理及检索问题,相比于该馆之前的管理系统,系统内存开销为原系统的1 20,处理器开销为原系统的1 10,检索速度提高了近50倍。     

Vertical handover policies for common radio resource management

The 3G and Beyond 3G wireless networks introduce new technologies, and in many cases, new frequency bands. Integrated hierarchical network architectural studies suggest that by using a Common Radio Resource Manager to engineer traffic across these component networks, operators can achieve increased efficiency and flexibility in supporting changing traffic demands. This study demonstrates how vertical handovers can be used to optimize network performance, by adaptively rearranging traffic across network boundaries. We survey policy implementations that consider which services/sessions shall move, where they shall move, when they shall move, and whether they shall return. Copyright © 2005 John Wiley & Sons, Ltd.     

异构认知网络环境下的动态分级资源管理方法

针对异构认知网络中的资源管理问题,提出了基于认知的动态分级资源管理方法(DHRM)。根据不同时间尺度,引入小波神经网络、基于维纳过程的预测方法和增强学习算法获得业务分布变化、切换呼叫资源需求量以及用户喜好等信息,从而动态调配异构多网络各级可用资源。在资源合理分配基础上,根据各网络实时状态以及用户喜好,通过多属性决策算法动态地将业务流分配到最佳接入网络中。仿真结果表明,DHRM相对于网间静态资源管理方法系统容量提高了约20%。     

Joint radio resource management for heterogeneous wireless systems

Heterogeneous wireless systems are characterized by the physical coexistence of a variety of radio access technologies with different, but also complementary, technical characteristics and performance. A key aspect of heterogeneous systems is then the implementation of efficient joint radio resource management mechanisms. In this context, this paper presents and evaluates novel joint radio resource management techniques based on the CEA bankruptcy distribution rule. The proposed policies base their distribution decisions on the system conditions and the varying quality of service requirements present in multimedia scenarios. The obtained results demonstrate that the proposed policies can efficiently distribute the radio resources with a low computational cost.     

Active resource management for the differentiated services environment

This paper presents a mechanism for active resource management (ARM) in a differentiated services environment. While the differentiated services architecture and the bandwidth broker agent provide a mechanism for QoS management through resource reservation, this mechanism is based on a static provisioning of resources. As bandwidth requirement are typically dynamic, such a static reservation approach can either lead to wasted bandwidth or leave applications resource‐starved. The active resource management approach presented in this paper addresses this problem by dynamically reallocating resources based on current network state and applications requirements. An implementation and evaluation of ARM using the NS‐2 simulation toolkit is also presented. Copyright © 2004 John Wiley & Sons, Ltd.     

Link-sharing and resource management models for packet networks

Discusses the use of link-sharing mechanisms in packet networks and presents algorithms for hierarchical link-sharing. Hierarchical link-sharing allows multiple agencies, protocol families, or traffic types to share the bandwidth on a link in a controlled fashion. Link-sharing and real-time services both require resource management mechanisms at the gateway. Rather than requiring a gateway to implement separate mechanisms for link-sharing and real-time services, the approach in the paper is to view link-sharing and real-time service requirements as simultaneous, and in some respect complementary, constraints at a gateway that can be implemented with a unified set of mechanisms. While it is not possible to completely predict the requirements that might evolve in the Internet over the next decade, the authors argue that controlled link-sharing is an essential component that can provide gateways with the flexibility to accommodate emerging applications and network protocols     

面向智能配电的异构融合网络无线资源管理

通信系统是体现智能配电网使用性能的重要因素.基于异构融合网络的通信系统能够更好地满足实际的通信需求.本文从智能配电网通信系统的特点入手,对面向智能配电的异构融合网络无线资源管理进行分析.     

综合资源管理系统分析

介绍了电信运营商在综合资源管理系统建设方面所需要解决的主要问题及中国联通综合资源管理系统的建设目标、定位等情况,阐述了该系统在OSS框架中的位置及其管理范围和管理特点.     

IPTV增值业务平台内容管理系统的设计与实现

网络电视(IPTV)内容管理系统主要实现对IPTV第三方增值业务提供商所提供的视频和文字信息等内容进行管理的功能.文章重点描述了IPTV内容管理系统的总体设计方案,介绍了组成该系统的主要功能模块的功能及其外部接口,给出了IPTV内容管理系统的软件结构,详细讨论了IPTV内容管理系统的编程实现方法.