基于泛在网络的资源发现与监控模型的研究

泛在网络是一个开放的巨复杂系统,泛在网络环境中的资源具有广域分布、自治、异构、动态等特性,如何对泛在网络资源进行有效的管理以满足用户的需求是一个极具挑战性的问题.文中结合移动Agent技术提出了一种新的泛在网络资源发现与监控模型.详细介绍了它的总体框架.工作机制,并给出了性能评价.     

基于移动计算的移动Agent技术研究

为了解决移动、断接、切换、电源失效等导致的移动计算可用性问题,针对移动计算特征和环境,阐述了有效的移动Agent体系结构,论述了移动环境下移动Agent的行为,集成负载均衡的Fork-Merge算法和预先认证等机制,以及应用移动Agent架构和移动计算的移动Agent中间件层次模型.分析表明该移动Agent体系结构能提供有效的移动计算服务.从而提供了一个良好的确保移动应用持续性的基于移动Agent技术的解决方案.     

基于移动Agent的移动计算形式理论分析

移动计算是在网络技术发展中涌现出的一种新计算范型.文章旨在从形式抽象的角度来认识基于移动Agent技术的移动计算的本质特点.文中分析了移动计算平台的综合特征,重点介绍了基于移动Agent技术的Seal演算模型.分析了位置,移动等概念在模型中的刻画,以及各自的交互,动态配置重构和资源控制机制在移动环境中的特点.     

普适计算与泛在网络

本文简要描述了普适计算的概念及普适计算的研究体系;泛在网络的概念及与普适计算的关系.简要介绍了移动泛在网络发展的愿景.在此基础上,较详细地讨论了我国专家们在泛在网络研究领域中提出的"环境感知泛在网络(AUN)"的概念和框架结构.     

移动泛在网络的发展趋势

随着无线接入技术的快速发展,通信网络的异构性特征变得更加突出,如何有效地实现不同网络间的互联互通以及获取所需的各类服务,并构建融合各网络异构性的移动泛在网络成为业界关注的重点。下一代移动网络(NGMN)项目综合考虑业务、终端和网络各方面的因素,是运营商主导的近期需求愿景,而移动泛在业务环境(MUSE)是学术界的学者们对于未来移动异构泛在网络的理想化的规划和设计,更着眼于远期的融合。未来的移动通信网络将逐渐向一个综合的网络体系平滑演进,为泛在移动宽带服务提供一个全新的平台。     

基于移动Agent的网络管理分析

随着我国网络技术水平的飞速提升,网络被逐渐应用到生产生活的方方面面,人们对网络技术发展的关注度及使用需求度也逐渐提高。虽然现阶段计算机行业对网络技术应用的研究较为成熟,但针对网络管理模式升级与优化的研究却相对较少。传统的网络管理系统大多数都采用了集中式的管理模式,这种管理模式具有灵活度低、数据处理受限、占用带宽等方面的不足,而新兴的移动Agent技术恰巧弥补了传统网络管理中的问题。移动Agent具有信息移动、自主执行、并行操作等特点,能较好地满足现代网络发展的需求。为了提高网络管理的安全性和可靠性水平,全面优化现阶段网络管理中的不足之处,文章针对网络管理的定义、移动Agent的技术特点、技术难点等问题展开了讨论与探究,并对基于移动Agent的网络管理结构进行了描述,以期为移动Agent技术在网络管理领域中的应用等相关工作提供指导。     

移动泛在网络环境(2)

以向个人提供始终最佳业务体验（ABE）为动力的移动通信与泛在网络的协同与融合,构成移动泛在业务环境（MUSE）,代表了下一代移动无线互联网络的重要发展方向。MUSE的研究将涉及计算模式体系、业务平台体系、运营体系和终端构成体系的融合,这些都将涉及对新型网络架构、控制方式、管理方式以及度量方法的探索与革新。网络资源的变迁,促使网络计算模式发生变化。为了使读者对移动泛在网络环境有所了解,本讲座将分3期对MUSE模型进行介绍：第1期介绍MUSE的产生背景,以及未来MUSE发展的愿景模型;本期介绍MUSE模型中业务实现的关键技术及设计原则;第3期介绍MUSE模型中的网络构架、网络的关键技术及设计原则。[编者按]     

基于WSN的移动Agent安全分析与建模

移动Agent分布计算的加入使得无线传感器网络WSN在低带宽、高容错的条件下实现了其自组织及资源受限等特性。但Agent自身面临的安全威胁及WSN开放的环境成为两技术结合大规模发展的瓶颈。论文详细分析了此方式工作过程及环境特点,并为之选取构造了一种Agent安全框架—ECC密码体制模型,经验证可有效减少网络通信时间、提高通信效率及可靠性,最终使得基于Agent方式的WSN通信更加安全、高效地工作。     

基于移动Agent的LEACH协议的研究与改进

无线传感器网络中路由协议最重要的设计目标是避免节点过早死亡,延长网络生存时间。文中在原有层次式路由协议LEACH的基础上,提出了一种新的MA-LEACH（Mobile Agent LEACH）路由协议,MA—LEACH中引入了移动Agent计算模式,避免了大量的感知数据在网络中传输,由移动Agent移动到感知节点进行本地处理。仿真实验表明,MA-LEACH比原有LEACH协议在降低节点能耗,延长网络寿命等方面上有了显著提高。     

移动泛在网络环境(1)

以向个人提供始终最佳业务体验（ABE）为动力的移动通信与泛在网络的协同与融合，构成移动泛在业务环境（MUSE），代表了下一代移动无线互联网络的重要发展方向。MUSE的研究涉及计算模式体系、业务平台体系、运营体系和终端构成体系的融合，这些都将涉及对新型网络架构、控制方式、管理方式以及度量方法的探索与革新。网络资源的变迁，促使网络计算模式发生变化。为了使读者对移动泛在网络环境有所了解，本讲座将分3期对MUSE模型进行介绍：第1期介绍MUSE的产生背景，以及未来MUSE发展的愿景模型；第2期介绍MUSE模型中业务实现的关键技术及设计原则；第3期介绍MUSE模型中的网络构架网络的关键技术及设计原则。     

物联网产业化发展思路与泛在无线通信技术研究

文章基于物联网的特征、技术思想及其与新兴产业的关系,重点研究了实现物联网产业化应用的关键——泛在无线技术,主要包括末梢感知层、网络融合层、无线资源管理以及对数据进行综合处理的信息处理等关键技术。文章指出物联网的本质是利用"泛在网络"实现"泛在服务",是一种更加广泛深远的未来网络应用形态。物联网正催生一场战略性新兴产业革命,将带来千载难逢的机遇,全面推动社会的经济振兴和社会进步。     

A Middleware Architecture for Securing Ubiquitous Computing Cyber Infrastructures

Ubiquitous computing is revolutionizing the way applications, users, resources, and physical spaces interact. Securing cyber infrastructures for ubiquitous computing environments, such as smart buildings and campuses, can be challenging. A critical cyber infrastructure is necessary that can combine networks, processors, and devices with mechanisms, protocols, and services to offer reliable, fault-tolerant, available, and secure operations. Existing CCI implementations create statically configured, confined networked subsystems that are isolated from the public Internet and are context insensitive. This leads to multiple, incompatible subsystems incapable of interoperating, thus making operations, management, and trust difficult. The Heterogeneous Survivable Trusted Information-Assurance Architecture addresses the problem of securing critical information services in large-scale ubiquitous computing environments. Hestia is a programmable middleware solution implemented as a network of middleboxes. These middleboxes form protective layers that isolate CCI services and mediate authorized access to Hestia’s services. They also provide a programmable, distributed, object-oriented framework that enables the integration of security, privacy, and reliability mechanisms in service-access interfaces and implementations.     

Software Architecture Patterns for a Context-Processing Middleware Framework

Ubiquitous applications are characterized by variations in their execution context. Their correct operation requires some continual adaptations based on the observation of this context. The design and implementation of these observation policies is thus the cornerstone of any ubiquitous application. COSMOS is a component-based framework for managing context information in ubiquitous context-aware applications. COSMOS decomposes context observation policies into fine-grained units called context nodes, which it implements as software components. These units perform basic context-related operations, such as gathering data from a system or network probe and computing threshold or average values. The framework assembles these units with a set of well-identified architectural design patterns. A mobile computing scenario illustrates the framework's benefits.     

A taxonomy of ubiquitous computing applications

Ubiquitous computing is emerging as a new paradigm in next-generation information technology. This new paradigm has been embodied into tremendous business models and applications through lots of ubiquity-related technologies. In this study, a new taxonomy for these business applications and technologies is suggested. In order to prove the practical values, two case applications of the taxonomy are conducted. In the cases, 24 ubiquitous computing services and 19 ubiquitous computing projects are classified so that the status quo of ubiquitous computing is analyzed.     

一种基于多代理的泛在网络模型

泛在网络是下一代网络发展的趋势,其目标是提供一个无处不在的网络,使得在不同网络间不需要预先配置或者离线协商就能进行透明合作提出一种基于多代理的泛在网络结构,对其结构进行了阐述和分析,讨论了网络代理间的通信。     

An Adaptive Middleware to Overcome Service Discovery Heterogeneity in Mobile Ad Hoc Environments

Ubiquitous computing research has progressed rapidly over the last few years, and real-world applications, especially mobile networking devices, are booming in consumer markets. With rising industry demand and career opportunities, more and more universities are offering graduates ubiquitous computing courses in addition to classical computer science curricula, such as mobile computing and wireless sensor networks. Here, I outline a graduate-level ubiquitous computing course I taught for final-year master's and first-year doctoral students in Finland at Abo Akademi University in 2006. Finland - the home of Nokia, the world's largest mobile phone maker - has more mobile devices per person than any other country, and its students are very interested in ubiquitous computing technologies. The experiences gained and lessons learned are a good source of information and reference for other educators in this field.     

Home Health Gateway Based Healthcare Services Through U-Health Platform

The Ubiquitous Health, or u-Health, service is an IT health care service using the ubiquitous computing environment. U-Health provides customized medical services. As it is a service that has developed from the current hospital visiting medical system, the u-Health service provides a patient with healthcare anywhere and anytime. In this paper, we propose a home health gateway based healthcare services through the u-Health platform. Using home health gateway, u-Health can provide health monitoring, diet, and exercise services using the healthcare decision support module in the ubiquitous environment. This approach would offer specialized services using an external content provider of DB. In addition, a doctor can provide advice to patients using the monitoring service. The proposed u-Health platform provides effective services using home health gateway in ubiquitous environments to customers, which will improve the health of chronic patients.     

Mobile agent based framework for mobile ubiquitous application development

Ubiquitous computing which enabled by the availability of mobile, heterogeneous devices that supply context information, is currently not matured by the lack of programming support for the design and development of context-aware applications. Especially, ubiquitous computing environment is not static which can be compensable dynamically according to need of environment. Mobile agent is a very efficient framework applications can cooperative in heterogeneous environment. Therefore, we have developed a mobile agent based framework that significantly eases the development of mobile, context-aware applications. The framework allows developers to fuse data from disparate sensors, represent application context, and reason efficiently about context, without the need to write complex code. An event based communication paradigm designed specifically for ad-hoc wireless environments is incorporated, which supports loose coupling between sensors, actuators and application components.     

Information and Service Integration Based on Agent-Oriented Ubiquitous Computing

Ubiquitous computing for information and service integration is currently at crucial point in its evolution, marked by the increasing developments of agent-based ubiquitous computing systems for the information and service integration. Some major features of ubiquitous computing systems (UCSs) consist of heterogeneity, decentralization, nondeterminism and dynamicity. Hence, agent-based ubiquitous computing (AUC) is a form of distributed computing by which computational processes are executed concurrently by assigning each computational process to one of agents on a UCS. The overarching goal of AUC is to support the seamless integration of information and services. Meeting this grand challenge of AUC requires that agent-orientation not tackled before is necessarily featured. To this end, taking advantage of the categorical structures we establish, in this paper, a firm formal development for featuring agent-orientation of ubiquitous computing. In other words, all of these are to formalize the AUC for information and service integration.