共查询到20条相似文献,搜索用时 531 毫秒
1.
计算机支持的协作学习(简称CSCL)作为一种新型的分布式的学习模式,更加强调学习的个性化与协作化,强调学习者在学习过程中的交互与协作,在网络教育领域得到了新的应用与发展,受到越来越多的关注。本文提出了一个基于本体的CSCL学习资源系统模型,解决在由于庞大的网络资源、异构的资源库和不同运行平台所带来的学习资源难以共享、不支持分布式学习和协作学习等缺点。 相似文献
2.
一个新的用于移动代理的签名方案 总被引:5,自引:0,他引:5
随着移动代理的发展,相关的安仝问题也日益受到关注。保护移动代理免受代理平台的攻击是一个非常关键和有挑战性的工作。该文讨论了如何才能使一个移动代理可以在一个恶意的代理平台下代替移动代理的拥有者进行签名且不暴露拥有者的密钥信息。提出了一个新的高效的签名方案。新方案不仅签名过程的时空效率可以比已有方案提高几倍,而且在随机预言模型下被证明是安全的。 相似文献
3.
4.
如何防止移动代理和代理平台之间的相互攻击 总被引:1,自引:1,他引:1
移动代理在实际应用中存在4种安全问题,即代理平台对代理平台的攻击、移动代理对代理平台的攻击、移动代理对移动代理的攻击和代理平台对移动代理的攻击。主要关注移动代理对代理平台的攻击和代理平台对移动代理的攻击及其解决方法。 相似文献
5.
6.
针对目前精品课程网站主要以展示课程资源为主的情况,应用CSCL网络工具和实体模型,提出了一种基于CSCL的课程网站的结构模型,该模型主要由协作学习和个体学习组成。协作学习包括协作学习工具、考试质量综合评价;在个体学习中,应用最小二乘法对个体学习成绩进行数据挖掘,实现计算机自动判断每位个体学习者的学习情况,并反馈给个体学习者以达到智能学习的目的。 相似文献
7.
移动代理是一种新型的分布式计算技术,有着许多传统分布式计算模型无法比拟的优势,是目前研究和应用热点。RMI(远程方法调用)是Java平台解决远程调用的方案,基于RMI技术设计了移动代理系统,对移动代理系统的关键问题进行了分析,通过RMI技术和动态类加载技术实现了移动代理系统,并设计实验验证了移动代理的移动性和自主性。 相似文献
8.
9.
10.
影响移动代理技术雅广的主要因素在于安全性、效率和标准,其中安全性是一个主要因素。移动代理安全性体现在移动代理机密数据的保护、移动代理和移动代理执行平台的验证等。目前,移动代理的各种安全技术都不能提供彻底的安全性,本文通过在一个开放环境下保护移动代理系统执行代码的验证,并在此基础上给出一个基于数字签名技术
术的移动代理和移动代理执行平台安全模型MASM02。该模型在理论上能抵抗已知的各种攻击;并且本身具有简洁性,易于实施;并经过安全性分析和攻击测试,具有可靠性。 相似文献
术的移动代理和移动代理执行平台安全模型MASM02。该模型在理论上能抵抗已知的各种攻击;并且本身具有简洁性,易于实施;并经过安全性分析和攻击测试,具有可靠性。 相似文献
11.
Hyesung Ji Kinam Park Jaechoon Jo Heuiseok Lim 《Peer-to-Peer Networking and Applications》2016,9(3):465-476
As Information & Communication Technology (ICT) is rapidly evolved, educational paradigms have been changing. The ultimate goal of education with the aid of ICT is to provide customized training for learners to improve the effectiveness of their learning at anytime and anywhere. In the online learning environment where the Internet, mobile devices, peer-to-peer (P2P) and the cloud technology are leveraged, all the information in learning activities is converted into digital data and stored in the Computer Supported Collaborative Learning (CSCL) system. The data in the CSCL system contains various learners’ information including the learning objectives, learning preferences, competences and achievements. Thus, by analyzing the activity information of learners in an online CSCL system, meaningful and useful information can be extracted and provided for learners, teachers and administrators as feedback. In this paper, we propose a learner activity model that represents the learner’s activity information stored in a CSCL system. As for the proposed learner activity model, we classified the learning activities in a CSCL system into three categories: vivacity, learning and relationship; then we created quotients to represent them accordingly. In addition, we developed a CSCL System, which we termed as COLLA, applied the proposed learner activity model and analyzed the results. 相似文献
12.
传统的移动协同学习模型的研究和架构都是从技术的角度提出,而忽略了协同过程中学习者相互作用的社会性对其的影响程度。首先在经典Granott模型的基础上研究了一种扩展的Granott相互作用模式,然后提出了一种基于扩展的Granott相互作用模式的移动协同学习模型,并对其中的Granott驱动逻辑对象进行了形式化算法描述,最后通过原型系统对模型进行了验证和实现。模型支持移动学习者基于扩展的Granott相互作用模式获取协同过程中同伴的协同行为,从而有效地完成协同学习工作。 相似文献
13.
RFID中间件技术是物联网发展的一个重要因素.通过对支付平台现状的分析,研究了RFID中间件技术应用到第三方移动支付平台的优势,进而设计了一个基于RFID中间件技术的第三方小额移动支付平台. 相似文献
14.
移动环境和设备的限制,给移动开发带来了挑战。移动中间件能够为移动应用开发提供了一个很好的基础平台。叙述了自适应机制在中间件层实现的必要性,分析了传统面向对象中间件应用在移动计算环境中的不足。根据移动应用的需求,提出了一个基于上下文感知的移动中间件体系结构。 相似文献
15.
Chan A.T.S. Siu-Nam Chuang 《IEEE transactions on pattern analysis and machine intelligence》2003,29(12):1072-1085
Traditionally, middleware technologies, such as CORBA, Java RMI, and Microsoft's DCOM, have provided a set of distributed computing services that essentially abstract the underlying network services to a monolithic "black box." In a mobile operating environment, the fundamental assumption of middleware abstracting a unified distributed service for all types of applications operating over a static network infrastructure is no longer valid. In particular, mobile applications are not able to leverage the benefits of adaptive computing to optimize its computation based on current contextual situations. In this paper, we introduce the Mobile Platform for Actively Deployable Service (MobiPADS) system. MobiPADS is designed to support context-aware processing by providing an executing platform to enable active service deployment and reconfiguration of the service composition in response to environments of varying contexts. Unlike most mobile middleware, MobiPADS supports dynamic adaptation at both the middleware and application layers to provide flexible configuration of resources to optimize the operations of mobile applications. Within the MobiPADS system, services (known as mobilets) are configured as chained service objects to provide augmented services to the underlying mobile applications so as to alleviate the adverse conditions of a wireless environment. 相似文献
16.
Streaming media from the Internet is a successful application for end-users. With the upcoming success of mobile devices
and home networking environments, cooperation among users will become more important in the future. To achieve such cooperation,
explicit middleware standards have been defined. On the other hand, Internet conferencing applications do not handle collaborative
streaming sessions with individual control for each user. We propose a new concept for cooperation exemplary for collaborative
media streaming using IETF multimedia session control protocols together with a proxy architecture. This concept enables both
synchronization among clients and flexible control to individual users. 相似文献
17.
18.
19.
Bart Rienties Bas Giesbers Dirk Tempelaar Simon Lygo-Baker Mien Segers Wim Gijselaers 《Computers & Education》2012
Recent findings from research into Computer-Supported Collaborative Learning (CSCL) have indicated that not all learners are able to successfully learn in online collaborative settings. Given that most online settings are characterised by minimal guidance, which require learners to be more autonomous and self-directed, CSCL may provide conditions more conducive to learners comfortable with greater autonomy. Using quasi-experimental research, this paper examines the impact of a redesign of an authentic CSCL environment, based upon principles of Problem-Based Learning, which aimed to provide a more explicit scaffolding of the learning phases for students. It was hypothesised that learners in a redesigned ‘Optima’ environment would reach higher levels of knowledge construction due to clearer scaffolding. Furthermore, it was expected that the redesign would produce a more equal spread in contributions to discourse for learners with different motivational profiles. 相似文献
20.
中间件是构件化软件的一种表现形式,中间件抽象了典型的应用模式。以一个移动增值平台为例,阐述构件化中间件系统的基本技术及在移动增值领域的应用。通过移动中间件在实际应用系统的具体设计与模块实现,设计一种基于数据库为中介的通用移动增值服务平台,并具体分析中问件满足快速开发和增强系统稳定性的优点,以及在增值领域开发还需要关注的问题。阐述了用移动中间件建立通用移动增值服务系统的必然性。 相似文献