基于泛网中移动终端的应用

现正进入一个信息时代,人们都希望不再要求去同一地点就可以完成指挥、调动、学习和生活的各项任务.泛网的出现及移动终端的普及使人们的愿望得以实现.人们可以利用移动终端在移动中完成语音、数据、图像等各种信息的交换和再现.基于IP技术的四网融合的泛网所构建的信息时代,可以使工作用泛网和各种信息终端来完成.将泛网虚拟地聚在一起,不再要求人们去同一地点就同样可以完成各项任务.文中所叙述的正是这种基于泛网的移动终端的应用.     

基于SOA与资源即插即用的RFID中间件

融合各种通信网络异构性的无线泛在网将成为网络发展的必然趋势。为实现无线业务的泛在化,提出一种基于SOA与资源即插即用功能的泛在网RFID中间件架构,使其能在未来的基于Web的无线泛在业务环境体系架构中完成智能感知设备资源的即插即用特性。介绍了该架构逻辑框架中各部分的功能与实现方法,并通过具体应用系统验证了该架构不仅可以解决RFID设备与应用系统之间的紧耦合问题,而且能够实现单一物理设备服务多种业务应用的需求。     

泛在网下基于上下文感知的虚拟终端技术研究

泛在网络环境下,业务提供必须根据网络和终端条件、用户偏好的变化而自适应地变化。因此,文中阐述了虚拟终端中的上下文感知功能,其为泛在多样性业务的开发提供了不可或缺的信息来源。提出一种应用于虚拟终端系统的上下文感知中间件体系结构,该中间件可以将各类应用场景中终端环境的特征参数进行抽象,形成可获知、可描述的上下文。提出应用该上下文感知技术的业务应用模型。最后通过一个多媒体业务接续场景对上述定义、抽象方法和业务模型进行验证。结果表明,该方法可以有效地为泛在多样性业务提取所需的上下文信息;通过该模型,业务平台和多构终端环境可以进行动态适配,为用户提供多样性和最佳体验的服务。     

基于物联网和移动IPv6的交互式泛在学习模型研究

本文通过对物联网泛在学习环境和移动IPv6技术的分析和研究,提出了基于物联网和移动IPv6的泛在学习的网络模型,并在此基础上给出了基于物联网和移动IPv6的交互式泛在学习模型,该模型可以使泛在学习成为真正意义上的4A学习模式。     

一种基于Android平台的即时通信方案

个人移动终端设备的迅速发展,使得人们对信息的传递有了更高的要求。目前即时通信的研究大多针对集中式固定系统,不能最大化地发挥移动终端的特性。基于Android智能平台及无线自组技术,设计并实现一套即时通信方案,能实现小范围内的陌生用户之间的即时通信,控制短信使其具有定时发送、定时删除的功能。通过搭建实际测试环境,验证该方案能够准确地完成自组织通信以及智能短信的收发。     

基于三网融合的感知与控制物联网平台的构架

文章将无线传感网络、因特网Internet、移动3G网这三网融合,提出了一个基于三网融合的感知与控制物联网平台的构架,该平台既可以通过无线传感网络监测环境信息或设备状态,在手持终端或Web服务器等处获取得到的监测信息;也可以从手持终端或Web服务器等处,对无线传感网络进行反馈控制。文章介绍了系统的整体框架、数据流以及各个模块的设计方案。     

剖析WAP网关

移动互联网是建立在WAP技术之上的,要真正实现应用需要三个环节,即WAP网关的建设、WAP内容服务器和WAP终端。网关与服务器之间通过HTTP1.1协议进行通信,服务的提供者几乎可以不改动信息的内容,只要增加网关设备,就可以向移动用户提供信息。网关还要完成DNS的功能。这样,终端只需要输入URL就可以得到相应的信息,减少了终端设备上浏览器的负担,使之既简单又廉价。网关的另一个功能是尽可能地减少用户浏览网络的延时,它可以通过与其它信息服务器之间的高速连接,减少信息获取的时间。 WAP规范使用标准的Web代理技术来将无线网络与Web连接起来。通过将处理功能集中在WAP网关中,WAP结构大大减少了手机上的操作负载,因此为手机实现价廉物美提供了基础。例如,一个WAP网关一般可以使用所有的DNS服务来解析URL中使用的域名,因此就不再需要手机来完成这个计算任务,同时,还可以利用WAP网关来为用户提供各种服务并且可以帮助网络服务商防止诈骗和服务利用。一个WAP网关一般包括以下功能: ☆协议网关:协议网关将来自WAP协议栈的请求翻译到WWW协议栈(HTTP和TCP/IP)中; ☆内容编码器和解码器:内容编码器将Web内容翻译成     

一种跨层移动自组网络安全路由协议

网络层安全是移动自组网安全的一个基本方面。过去,人们对移动自组网网络层安全的研究主要集中在使用密码体制来保护路由消息的真实性和完整性上。但是,密码学体制所带来的额外资源开销和延时比较大。因此,移动自组网需要一种轻权的网路层安全机制。本文提出了一种基于跨层的移动自组网安全路由协议,利用跨层信息来提高网络层的安全性。模拟实验表明,我们所提出的安全路由协议是有效的。     

Mobile CSCW技术在MIS中的研究和应用

随着智能移动终端的发展,移动CSCW逐渐成为CSCW的发展趋势,人们可以在任何时间和任何地点实现协同工作.分析移动CSCW的特点,提出一个基于移动CSCW的系统模型,并且在此基础上实现一个基于移动CSCW系统模型的仓库管理系统.     

一种面向融合泛在网的协同防护体系设计

在深入分析融合泛在网功能和特征的基础上,通过增加安全接入网关和虚拟重构安全控制服务器(简称安全控制服务器)两类主要的功能实体构成协同防护的硬件体系,同时通过策略订阅实现协同防护的软件逻辑体系,并采用基于证据投影分解方法的证据理论实现安全态势评估,从而实现在融合泛在网中各种末梢网络均可通过安全接入网关,利用现有的各种异构接入网络安全接入到位于IP核心网的安全服务平台,也可将安全服务命令和数据发送到末梢节点。     

State of the art of frameworks and middleware for facilitating mobile and ubiquitous learning development

The emergence of mobile and ubiquitous technologies as important tools to complement formal learning has been accompanied by a growing interest in their educational benefits and applications. Mobile devices can be used to promote learning anywhere and anytime, to foster social learning and knowledge sharing, or to visualize augmented reality applications for learning purposes. However, the development of these applications is difficult for many researchers because it requires understanding many different protocols; dealing with distributed schemas, processes, platforms, and services; learning new programming languages; and interacting with different hardware sensors and drivers. For that reason, the use of frameworks and middleware that encapsulate part of this complexity appears to be fundamental to the further development of mobile learning projects. This study analyzes the state of the art of frameworks and middleware devoted to simplifying the development of mobile and ubiquitous learning applications. The results can be useful to many researchers involved in the development of projects using these technologies by providing an overview of the features implemented in each of these frameworks.     

A knowledge engineering approach to developing mindtools for context-aware ubiquitous learning

Recent developments in computing and mobile technologies have enabled the mobile and ubiquitous learning approach, which situates students in an environment that combines real-world and digital-world learning resources. Although such an approach seems to be innovative and interesting, several problems have been revealed when applying it to practical learning activities. One major problem is owing to the lack of proper learning strategies or tools that can guide or assist the students to learn in such a complex learning scenario. Students might feel excited or interested when using the mobile devices to learn in the real world; however, their learning achievements could be disappointing. To cope with this problem, in this study, a knowledge engineering approach is proposed to develop Mindtools for such innovative learning scenarios. Experimental results from a natural science course of an elementary school show that this innovative approach not only enhances learning motivation, but also improves the learning achievements of the students.     

基于Java 语言的移动端软件开发研究

移动设备的大量产生,使人们将目光转移到移动端软件开发当中,通过研发出各种各样的移动端软件,能够有效满足人们的生活、学习、生产需求,极大程度地推动了社会经济增长。本文对Java 语言在安卓系统软件开发中的应用优势进行探讨,分析了Java 语言对安卓系统软件架构的影响,并以加密软件的开发为例对基于Java 语言的移动端软件的开发流程进行了探讨。     

普适环境下的信任管理及其在移动服务中的应用

作为一种新的计算模式,普适计算在逐渐进入我们生活的同时,普适计算下的安全也引起了越来越多的关注.首先分析了现有信任管理存在的缺陷,接着针对普适计算的特点分析了普适环境下的信任管理,最后结合普适环境下的一个典型应用--移动服务,提出了一种基于信任管理的移动安全方案.     

基于PKI的VPN安全管理系统的设计与实现

VPN网关和移动端用户的安全管理一直是人们关注的问题,特别是对移动端用户的管理。如何有效地、安全地管理VPN网关和移动端用户,消除相当普遍的VPN管理问题,是本文研究的重点。针对这一问题,本文提出并设计了一种基于PKI的VPN安全管理方法,实现了对VPN网关和移动端用户的安全管理。     

泛在学习理论中微课程的设计与研究

微课程于泛在学习理论和环境中产生,微课程的设计是非常重要的。通过分析微课程特点,划分微课程类型,从生活化的情境性、短小适用的微元性、紧密相关的关联性、直观生动的可视化和无处不在的无缝性五个角度设计微课程,并通过具体案例展示微课程设计成果。     

Ubiquitous learning website: Scaffold learners by mobile devices with information-aware techniques

The portability and immediate communication properties of mobile devices influence the learning processes in interacting with peers, accessing resources and transferring data. For example, the short message and browsing functions in a cell phone provide users with timely and adaptive information access. Although many studies of mobile learning indicate the pedagogical potential of mobile devices, the screen size, computational power, battery capacity, input interfaces, and network bandwidth are too restricted to develop acceptable functionality for the entire learning processes in a handheld device. Therefore, mobile devices can be adopted to fill the gap between Web-based learning and ubiquitous mobile learning. This study first creates a website, providing functions enabling learning to take place anytime and anywhere with any available learning device, for ubiquitous learning according to various properties of mobile devices. Nowadays, learners’ behaviors on a website can be recorded as learning portfolios and analyzed for behavioral diagnosis or instructional planning. A student model is then built according to the analytical results of learning portfolios and a concept map of the learning domain. Based on the student model and learners’ available learning devices, three modules are developed to build a ubiquitous learning environment to enhance learning performance via learning status awareness, schedule reminders and mentor recommendation. Finally, an experiment is conducted with 54 college students after implementation of the ubiquitous learning website. Experimental results indicate that the proposed system can enhance three learning performance indicators, namely academic performance, task accomplishment rates, and learning goals achievement rates.     

A context-aware video prompt approach to improving students' in-field reflection levels

Engaging students in reflection during real-world observation and inquiry activities has been recognized as an important issue for improving students' learning achievement and motivation. Many studies in the literature have adopted text-based reflection prompts as an important strategy to promote learning performance, this study argues that using videos as a reflection prompt would be more effective for improving learners' ubiquitous learning experiences and can provide a more sensible scenario that is better fitting the real-world contexts than the text-based prompts. In this study, a context-aware video-based prompt approach is proposed for improving students' reflection levels and satisfaction by providing timely and personalized guidance using mobile, wireless communication and sensing technologies. An experiment was conducted for evaluating the effectiveness of the proposed video-based prompt strategy with 70 participants in two groups. The results show that learners' reflection levels were significantly improved with the use of the proposed approach and that positive attitudes were observed toward the use of video-based prompts in the context-aware ubiquitous learning environment.     

基于普适计算的学习框架的研究

普适计算（ Pervasive/Ubiquitous Computing ）是继主机计算、桌面计算之后发展起来的一种新的计算模式,但它在教育和学习领域还涉足甚微。随着技术的不断进步和学习科学理论的发展,普适计算与教学环境相结合是不可抵挡的趋势。普适学习环境就是将普适计算应用到人类的学习环境中,使其实现无处不在的学习这一特点。文章在总结普适计算及普适学习环境相关概念的基础上,通过研究分析一个比较成熟的普适学习环境的个案,提出了实现这一环境的框架模型及相关技术。     

高校微课教学研究与设计

微课是网络时代出现的一种新型的教学资源。它以视频为主要载体,以短小精悍为主要特点,在网络上可以广泛存在,让人们实现泛在学习。本文介绍了微课的定义、特点、时长以及设计方法,同时还介绍了全国高校微课比赛的相关情况。