内容中心网络中的移动性管理

内容中心网络(CCN)是未来网络发展的方向之一,该架构为内容分享而生,通信模式从现有以节点为中心改为以内容为中心,近年来被广泛关注的物联网主要的数据流量也是对内容进行分享,因此,物联网非常适合通过内容中心网络来搭建,而典型的CCN并不支持物联网中对节点移动性的要求,为了解决这一问题,我们通过协议无感知转发(POF)来实现CCN中节点无缝切换,重新设计的POF-CCN可以同时支持用户移动性和服务器无缝移动。     

对未来个人通信方式统一化设想

本文介绍了未来通信方式的一些事例,包括多媒体互动、三网融合等,同时为了更好地满足人们对通信越来越高的需求,指出通信网络需要具备对环境的主动感知能力等,提出了未来个人通信方式统一化的一些设想和通信网络应具备的能力,并给出了通信网络能力配置图。     

融合通信中基于状态感知的非实时通信技术研究

融合通信技术是当今通信领域的又一创新,主要是将各种不同的通信网络融合为一体,也就是以计算机网络、传统网络、通信服务网络等多种内容的整合,是包含电话、传真、邮件、遥控等多种通信方式为一体的综合内容。本文首先简单介绍了融合通信的概念与种类,然后分析了基于状态感知的非实时通信技术的研究要点。     

一种新型机载战术网络下的内容驱动路由协议

传统机载战术网络(ATN)紧耦合于作战应用,且未考虑到信息内容本身,导致ATN下的路由协议无法为不同的信息内容提供差异化的通信服务,难以满足任务需求动态多样的航空集群平台通信需求。为此,通过融合软件定义网络、信息中心网络和机载战术网络架构,提出软件定义信息中心机载战术网络架构,并以此架构为基础,设计内容驱动路由协议,为不同的信息内容提供不同等级的路由转发能力,从而为网络提供高效的差异化服务。仿真结果表明,与传统的迪杰斯特拉算法相比,内容驱动路由协议能够减少端到端时延,提高吞吐量与网络通信性能。     

统一通信在企业信息化中应用探讨

随着通信技术、计算机、NGN及"云"应用的发展。IMS和信息融合技术的不断完善,统一通信必将是技术和应用发展的必然趋势,企业通过它不仅实现了网络的融合,更实现了应用的融合,同时为企业员工带来选择的自由、效率的提升以及企业整体运行机制的改变和提高,并向员工提供多样化、多媒体化和个性化的服务,提升企业的竞争力。     

IP融合通信技术在通信网的融合与应用研究

在信息时代下,计算机技术、信息技术与通信技术快速的融入到各行各业中,改变了企业的生产模式和内部管理系统。目前,有很多企业将人力、物力、财力等资源投放到IT建设和通信设施应用中,根据网络用户的设计需求,将IP融合通信技术应用到通信网中,优化网络信息环境,建立丰富的网络平台,促进现代化企业的建设和发展。本文研究的主要内容是IP融合通信技术在通信网中的融合与应用。     

如何利用信息技术建设社会主义特色未来学校

●未来学校内涵 实践表明,学校正在发生一场结构性变革,将教育模式从"批量生产"变为"私人订制",并通过空间、课程和技术的深度融合,为学生提供个性化学习体验,让学校适合学生,而非让学生适应学校.朱永新认为,未来的学习中心,没有固定的教室,每个房间都需要预约,没有以"校长室""行政楼"为中心的领导机构.未来的学习中心,没有...     

面向移动互联网的统一通信会议

统一通信是指把计算机技术与传统通信相互融合的一种通信模式,利用先进的技术打破当前通信手段中以设备和网络为中心的限制,使人们只要通过最常使用的通信工具和应用,就可以便捷高效地在企业内部与同事、客户及合作伙伴沟通.本文以现有的企业统一通信的项目为背景,主要研究了会议的模块.对会议模块进行了设计,并相应的介绍了有关的MQTT协议和电话会议多媒体会议的流程与原理.最后再对自己的设计与研究进行了实验,最终实现了电话会议通话和多媒体会议通信的功能.     

应急通信管理系统的设计与开发

提出并建立一个基于设备驱动、融合通信和通信服务三层结构的应急通信管理系统．为应急指挥系统的应用提供统一的通信调用接口,具备融合通信管理能力,为应急指挥提供集成化的多模式通信服务,提升应急指挥的效能。     

应急通信管理系统的设计与开发

提出并建立一个基于设备驱动、融合通信和通信服务三层结构的应急通信管理系统,为应急指挥系统的应用提供统一的通信调用接口,具备融合通信管理能力,为应急指挥提供集成化的多模式通信服务,提升应急指挥的效能。     

Mixed Integer Non-Linear Programming models for Green Network Design

The paper focuses on Network Power Management in telecommunication infrastructures. Specifically, the paper describes four energy aware network design problems, with the related mathematical models, for reducing the power consumption of the current and future Internet. Each problem is based on a different characterization and power awareness of the network devices, leading to either Mixed Integer Linear Programming or Mixed Integer Non-Linear Programming models. We have assessed the effectiveness of the proposed approaches under different real core network topology scenarios by evaluating the impact of several network parameters. To the best of our knowledge, this is the first work that deeply investigates the behavior of a pool of diverse Network Power Management approaches, including the first Mixed Integer Non-Linear Programming model for the Power Aware Network Design with Bundled Links.     

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.     

.NET下Web服务的开发研究

网络应用正从面向对象的架构向面向服务的架构方向转变,基于Web服务架构的开发模型顺应了从组件复用向服务复用转变这一未来软件发展的新趋势。本文以服务技术的发展应用为基础,探讨了.NET环境下的web服务开发,提出了基本实现思路。     

．NET下Web服务的开发研究

网络应用正从面向对象的架构向面向服务的架构方向转变，基于Web服务架构的开发模型顺应了从组件复用向服务复用转变这一未来软件发展的新趋势。本文以服务技术的发展应用为基础，探讨了．NET环境下的web服务开发，提出了基本实现思路。     

一种适用于服务组合平台的语境信息使用模式

面向服务应用中的语境信息有多种用途,实现过程各异．这增加了支撑平台开发与维护的复杂程度．文章对这些用途进行了分析,并将它们在实现过程中的共性特点进行抽象,以此为基础,提出了一种适用于服务组合平台的语境信息使用模式．按这种模式,服务组合平台能够以统一的方式对语境信息的各种用途提供支撑,有效支持了面向服务应用在运行时的语境敏感需求,同时简化了平台本身的开发与维护．结合在奥运信息服务平台FLAME2008上的实现进行测试．并对测试结果做了分析．     

A GPS-free method for vehicle future movement directions prediction using SOM for VANET

Predicting the next movement directions, which will be chosen by the vehicle driver at each junction of a road network, can be used largely in VANET (Vehicular Ad-Hoc Network) applications. The current methods are based on GPS. In a number of VANET applications the GPS service is faced with some obstacles such as high-rise buildings, tunnels, and trees. In this paper, a GPS-free method is proposed to predict the vehicle future movement direction. In this method, vehicle motion paths are described by using the sequence of turning directions on the junctions, and the distances between the junctions. Movement patterns of the vehicles are extracted through clustering of the vehicle’s motion paths using SOM (Self Organizing Map). These patterns are then used for predicting the next movement direction, which will be chosen by the driver at the next junction. The obtained results indicate that our GPS-free method is comparable with the GPS-based methods, while having more advantages in different applications regarding urban traffic.     

基于域名重定向的可疑域名拦截技术

随着互联网技术的飞速发展,越来越多的人正享受着互联网提供的服务。互联网中绝大多数的服务都是基于Web页面的服务,而这类服务存在巨大的网络安全隐患。网络中的DNS(Domain Name System)数据内容中包含有大量的与Web应用相关的信息,通过监测DNS数据内容可以高效地发现、定位、解决相关网络安全问题。该文通过对DNS域名重定向,有效的对可疑域名进行拦截。     

基于网格分簇的WSN能量感知路由协议

针对现有无线传感器网络中各节点能量消耗不均的缺陷,提出基于网格的二层分簇方案设计能量感知路由协议,在分簇过程中,利用节点位置信息确定簇的大小,通过簇头节点来实现均匀的网络划分。经过理论分析和仿真实验,对该协议的性能进行验证,并与LEACH协议进行比较。结果表明,该协议能够使网络中各节点较均衡地消耗能量,从而延长整个网络的生命周期。     

Managing connection-level QoS through an overlay service manager

We illustrate the role of service management in managing the quality-of-service (QoS) of applications. An increasing diversity of applications is expected to be offered over future networks. Even if these applications use the same media, their connection-level QoS measures can be different depending on their connection-level resource requirements and on their implementation at the connection layer. To illustrate this, we consider two representative service classes. Simple applications refer to applications that involve a fixed number of clients and point-to-point connections. Complex applications, on the other hand, are characterized by dynamic client-membership and require multipoint connections. These two service classes perceive different connection-level QoS measures. For instance, simple applications can get blocked-external blocking is a possible QoS measure. Complex applications can, in addition to external blocking, suffer from internal loss. The latter is defined as the probability that a client in an ongoing application aborts the application because a newer client cannot add to the application. Internal loss is a measure of how clients in a complex application (such as a conference) are bound to each other at the application layer. Thus, the QoS of complex applications is then expressed as a tuple of external blocking and internal loss probabilities. In this paper, we consider an end-to-end ATM platform and assume that the traditional ATM admission problem has been solved. The service manager manages the connection-level QoS of these two service classes by an overlay—that is, it overlays ATM connection admission procedures. Its objective, from a fairness viewpoint, is to ensure that the QoS perceived by an application is independent of its service class. We study a service management implementation that uses a threshold to allocate available bandwidth to simple applications and to complex applications. We compute exactly, through queueing analysis, the QoS measures of the two service classes as a function of the threshold. We propose an optimality criterion for the threshold whereby both service classes suffer equal degradation. An interative algorithm uses this criterion to approximately design such thresholds in the entire network.     

支持移动计算的反射式中间件

传统中间件基于黑盒的设计思想,缺乏必要的灵活性,无法适应复杂动态多变的移动计算环境。反射技术可以使应用程序在运行时检查中间件所提供的服务类型,动态的构造调用请求,适应变化的环境。文章研究了反射的相关概念,中间件技术,分析了移动计算的实际需求,提出了一个支持移动计算的反射中间件架构,支持环境感知、异步通信、动态重配置等。