移动计算环境下的个人化服务发布和组装

随着移动计算技术的发展,移动设备用户可以服务的方式共享移动设备及其周围设备的计算能力和计算资源.然而,移动设备的私有性、资源受限性以及移动性等特征使得这种基于移动设备提供的个人化服务在发布和组装方面存在着一些特殊问题,例如用户隐私、移动设备资源消耗、网络环境变化引起的失效问题等.针对以上这些问题,提出一种移动计算环境下的个人化服务发布和组装方法.该方法在个人化服务发布过程中引入了服务意愿的概念,并在服务选择过程中综合考虑了服务意愿和服务效用.此外,还提出了资源感知的心跳机制来定期更新服务选择所依赖的设备及服务状态信息,从而解决由于网络环境变化等引起的服务失效问题.基于该方法,提出了一个基于JADE和OSGi的实现框架.通过一个案例分析,验证了所提出的实现框架的有效性以及在移动计算环境下考虑服务意愿的合理性.     

移动普适环境中支持QoS控制的安全框架研究

基于对移动普适计算环境所面临的安全威胁的分析,从用户,网络和服务提供商3个方面总结了移动普适计算环境的特殊安全需求,并提出一种适用于移动普适计算环境且支持QoS(quality of service)控制的安全框架.对该框架的相关功能操作和工作时序进行了介绍,并着重研究和实现了安全框架中的QoS控制流程.通过此框架,移动互联网设备用户可以随时随地访问移动普适计算环境并获得高质量的安全服务.     

基于代理的移动云服务访问机制的研究与实现

移动设备的计算能力、存储能力、网络带宽、电池续航等都非常受限,而且现有的云服务基本没有针对移动设备的上述特点做优化,严重降低了移动设备访问云服务的质量。针对存在的问题,提出了面向移动设备的数据传输格式优化模型和服务Mashup模型,设计并实现了一个基于代理的移动云服务访问框架,使得移动设备通过代理服务器来访问云服务。在4种不同情况下对移动设备的服务请求响应时间、响应结果处理时间、请求响应流量和能耗分别进行了测试,结果表明实现的框架具有一定的实际意义。     

一种基于上下文协商的动态服务组合方法

普适计算的计算环境和交互信息动态变化,为了提供适时适地的服务,服务组合除了满足用户的需求之外,还要适应环境的变化.以面向普适计算的分布式文档管理系统为例,提出一种基于上下文协商的动态服务组合方法,适应普适计算环境下资源动态变化的特点,同时满足用户对服务的需求.首先定义上下文和带有上下文信息的服务模型;然后给出服务和设备以及服务和用户之间的上下文协商约束条件,根据约束条件提出基本算法实现服务动态组合,并对基本算法进行优化;最后通过原型系统和实验验证算法的性能和有效性,并通过实验数据分析上下文对于服务组合的影响.实验数据说明:提出的方法能够应用在普适计算环境中上下文敏感的服务组合问题上,提高服务组合的动态适应性和网络资源利用率.     

基于移动设备的个人云服务及资源Mashup

个人用户家庭或工作环境中的智能手机、个人电脑、智能相册等通过网络形成个人云,为个人的数据处理和共享带来了便利。然而,如何面向具体应用需求为用户提供方便、高效的个人云服务及资源整合仍然是一个亟待解决的问题。为此,提出了一种基于移动设备的个人云服务及资源Mashup框架来统一管理设备和描述服务及资源,并阐述了如何通过框架合理构建Mashup应用;此外,开发了基于Agent的框架实现以及Android客户端。基于该框架及客户端,用户可以通过整合个人云服务及资源方便、快捷地构造个人化应用。通过一个用户案例研究对所提出的Mashup框架及其实现的有效性和易用性进行了评估。     

普适计算中的服务访问控制模型

随着无线移动终端的迅速发展和广泛使用,结合移动Agent的优势,本文提出了一个基于移动Agent在固定设备和移动设备组成的普适计算混合环境中提供服务访问控制的模型。该模型主要包括基于Jess推理机的逻辑规则控制引擎,用户隐私信息存储层,供点对点Agent使用的查询接口和获得更多外部资源的服务接口。最后通过一个约会订餐的场景来对本模型进行分析。     

面向普适计算的动态自适应中间件模型

为了提高普适计算系统的开发效率, 设计了一个基于OSGi框架的动态普适计算中间件模型. 该中间件模型以OSGi框架为基础, 建立移动管理器管理用户和服务的移动, 利用上下文管理器来管理上下文, 动态调整自己的行为, 支持上下文感知应用. 通过标准的接口实现各种异构普适设备间的互操作性. 实验结果表明该中间件能够满足通用普适计算环境的要求, 对于普适计算系统的开发具有一定的借鉴意义.     

基于Android的移动云计算技术的研究

移动终端设备发展迅速,推动着移动互联网的迅猛发展。然而,移动终端的硬件资源如计算能力、存储空间以及电池续航能力等的限制,也成为了移动互联网的发展瓶颈。云计算作为一种新型的计算模式,很好的解决了移动终端资源不足的问题。通过研究云计算的相关技术,使用Hadoop开源框架搭建私有云平台作为服务器端并以Android手机平台作为客户端实现了一个面向移动终端的基于云服务的文件管理系统,用于管理文件并提供终端文件的上传、下载服务。结果表明,系统具有良好的稳定性和可行性。     

基于Android的移动云计算技术的研究

移动终端设备发展迅速,推动着移动互联网的迅猛发展。然而,移动终端的硬件资源如计算能力、存储空间以及电池续航能力等的限制,也成为了移动互联网的发展瓶颈。云计算作为一种新型的计算模式,很好地解决了移动终端资源不足的问题。通过研究云计算的相关技术,使用Hadoop开源框架搭建私有云平台作为服务器端并以Android手机平台作为客户端实现了一个面向移动终端的基于云服务的文件管理系统,用于管理文件并提供终端文件的上传、下载服务。结果表明,系统具有良好的稳定性和可行性。     

普适计算服务匹配技术研究

在普适计算环境下需要根据用户的需求提供合适的服务,这需要对用户请求的服务和环境提供的服务进行服务的匹配.而目前使用的基于语法的服务匹配和基于语义的服务匹配都不能很好地适应普适计算环境的高效、资源约束和上下文感知的要求.通过分析普适计算环境下主要的基于语法的和基于语义的服务匹配技术,给出普适计算环境下在高效、资源约束和上下文感知的特殊要求下服务匹配的解决方案,并就面向服务组合的服务匹配进行了分析.     

On Composite Web Services Provisioning in an Environment of Fixed and Mobile Computing Resources

We present a framework for Web services provisioning in a hybrid environment of fixed and mobile computing resources. Several obstacles still hinder the seamless provisioning of Web services in mobile environments. Examples of such obstacles are: throughput and connectivity of wireless networks, limited computing resources of mobile devices, and risks of communication channel disconnections. In the proposed framework, software agents represent users, providers of services, and providers of resources. The business logic of composite services is expressed as a process model using statecharts formalism. Among other things, the use of agents provides an infrastructure that has the ability to handle disconnections during service preparation for execution. The framework also integrates a service execution planning approach to optimally select computing resources (fixed or mobile) on top of which services will be executed.     

Enabling smart spaces with OSGi

Today's pervasive computing spaces are developed primarily with proprietary technology and seem to lack a long-term vision of evolution and interoperation. The future pervasive computing environment will comprise a wide variety of devices and services from different manufacturers and developers. We must therefore achieve platform and vendor independence as well as architecture openness before pervasive computing spaces become common places. The Open Services Gateway Initiative attempts to meet these requirements by providing a managed, extensible framework to connect various devices in a local network such as in a home, office, or automobile. By defining a standard execution environment and service interfaces, OSGi promotes the dynamic discovery and collaboration of devices and services from different sources. Moreover, the framework is designed to ensure smooth space evolution over time and to support connectivity to the outside world, allowing remote control, diagnosis, and management. We present the OSGi technology and examine several OSGi development toolkits and products. We also share our experience in using OSGi to build an open, assistive environment that supports independent living for elders.     

Semantic management of multiple contexts in a pervasive computing framework

Mobile devices can perceive greater details of user states with the increasing integration of mobile sensors into a pervasive computing framework, yet they consume large amounts of batteries and computational resources. This paper proposes a semantic management method which efficiently integrates multiple contexts into the mobile system by analyzing the semantic hierarchy and temporal relations. The proposed method semantically decides the recognition order of the contexts and identifies each context using a corresponding dynamic Bayesian network (DBN). To sort out the contexts, we designed a semantic network using a knowledge-driven approach, whereas DBNs are constructed with a data-driven approach. The proposed method was validated on a pervasive computing framework, which included multiple mobile sensors (such as motion sensors, data-gloves, and bio-signal sensors). Experimental results showed that the semantic management of multiple contexts dramatically reduced the recognition cost.     

面向普适计算的服务构件动态部署问题及算法

有限的资源是嵌入式应用的一个局限性,因此越来越多的嵌入式设备联网,通过共享资源为用户提供灵活的服务以适应普适计算的要求.以构件化嵌入式操作系统Liquid为背景,研究普适计算环境下多个服务构件动态部署问题,合理分配利用资源,克服单个嵌入式设备的资源局限性.首先对部署问题进行描述,然后给出服务构件动态部署的基本算法和启发式算法,并对启发式算法优化,最后通过算法模拟及数据分析算法的性能.虽然在Liquid系统上进行模拟实现,但算法具有通用性,启发式算法的效率分析表明,它适合设备或者服务构件数目较多的普适计算环境,在部署服务构件的同时提高服务准入成功率和资源的利用率.     

A synergetic mechanism for digital library service in mobile and cloud computing environment

Digital library services in the mobile computing have come into our daily life with the development of wireless communication and the manufacture of mobile devices. Digital libraries have collected large-scaled data for providing information service. However, there are still many problems such as limitations of computing on mobile devices and data transmission problems in the wireless network. This paper proposes a synergetic mechanism for digital library to provide information service in the mobile and cloud computing environment, which combines the digital library servers, mobile hosts and personal cloud space into a synergetic work group seamlessly. The proposed mechanism integrates the strong computing and large-scaled storage ability of cloud computing together with the convenience of mobile computing. It could help promoting knowledge sharing and improve work efficiency of users in the mobile and cloud computing environment.     

一个适用于遍在计算环境的中间件体系结构框架

1.背景随着计算技术和通信技术的发展,不仅桌式计算机变得非常普遍,非PC设备正以惊人的速度成为市场的主流,如:机顶盒、移动电话、PDA、家用电器、汽车电子、游戏机等等。特别是随着家庭网络和无线网络的发展,网络变得更加的普遍。计算已经不只限于桌面,它渗透到人们生活和工作的各个环节,这就是所谓的无处不在的计算环境(pervasive computing,简称遍在计算环境)。在这样的环境中,人们希望:即使他们在频繁地移动,或者各种资源在动态地加入或离开,他     

A design and implementation of a framework for games in IoT

Interconnection of the sensing and actuating devices providing the ability to share information across platform through a unified framework for enabling innovative applications. This is achieved by seamless ubiquitous sensing, data analytics and information representation as the unifying framework. Extending the current internet with interconnected objects and devices and their virtual representation has been a growing trend in recent years. Internet of Things (IoT) services are becoming a popular services. This will be supported challenges in a large of aspects such as smart health, green energy, smart home and personalized applications. So, the IoT plays more and more important issue in lifestyle through entertainment such as Games. As of yet, there has not been much research done on IoT environment games as a service. In this paper, we propose schemes of the design and implantation of IT convergence framework for games as a service of IoT. First of all, we discussed what to consider when design and implementation of IT convergence framework for games through contents using user’s mobile devices and various sensors in IoT environment and suggest related techniques. Then, we showed the possibility of games in the IoT environment by creating games and measuring the interactions of users in the IoT environment.