云计算技术在数字图书馆的应用

云计算技术以其海量数据存储、强大的计算能力以及高安全性成为了新一代的互联网计算模型,其给数字图书馆带来了全新的Web服务模式,也将对信息技术环境下构建云资源共享平台、个性化、移动图书馆等产生积极影响。文章分场景、角色对云数字图书馆的未来及应用进行了阐述。     

基于移动终端的系统登录方法的研究与开发

本文针对在不安全的网络环境或不安全的上网系统的环境下,提出一种基于移动终端的安全登录系统,克服了现有移动登录方案的不足。当用户使用浏览器在一个Web信息系统或应用系统进行登录操作时,Web信息系统或应用系统将浏览器与Web系统之间的会话标识数据以二维码的形式显示在浏览器上,用户只需使用移动终端的摄像头扫描二维码获得会话标识数据并利用移动终端完成身份认证即可实现用户浏览器在Web信息系统或应用系统的安全登录,用户无需在计算机上输入帐户名、口令,从而避免了在公共计算机上输入帐户名、口令导致的帐户名、口令被窃取的风险,而且将用户在不同Web信息系统或应用系统的身份凭证保存在移动终端中也给用户进行登录操作带来方便。     

面向移动数字图书馆的情境敏感型知识推荐研究

随着移动通信的发展,数字图书馆的各种知识服务更多地在移动终端上实施,但现有的移动数字图书馆对于用户环境、场景等“情境”的感知能力不足,缺乏为用户提供适应当前情境的个性化知识推荐服务。因此提出基于信息嫡度量读者的情境敏感性。基于情境敏感度对读者进行相似性比较,并利用这种比较扩展了协同过滤算法。试验结果表明,该方法为移动数字图书馆具备情境敏感的能力,提高知识推荐的准确性提供了一种新的途径,有利于给读者提供既满足情境又符合其个性化需求的知识资源。     

移动阅读社交系统设计与实现

为增强移动环境中用户的阅读体验,文中设计的系统通过为电子图书添加知识点的语义标注向用户提供知识点查询服务,实现了知识点的快速点答;建立阅读社区帮助相同阅读爱好的用户互相交流,为用户提供基于位置的社交服务;设计了重视用户体验的移动阅读软件,使人们在移动阅读环境中享受到普适计算带来的便利.实验测试表明,系统能够为用户快速提供基于语义标注的知识解答,并能为用户提供稳定可靠的实时交流服务.     

基于移动Agent的分布式信息查询系统

提出了一个基于移动Agent的、适用于移动计算环境中的分布式信息查询系统的框架，并采用Aglets平台，在模拟的实验环境下实现了该原型系统。该系统具有效率较高、可扩展、支持大规模用户并发访问等特点。     

基于位置信息的流式移动应用推送系统的研究

目前与位置相关的移动应用越来越多,传统应用分发模式中,用户需要手动对应用进行搜索、下载、安装以及卸载,不利于提升用户使用应用服务的体验。设计并实现了基于位置信息的流式移动应用推送系统,该系统中服务器利用移动终端位置信息将相关应用解析、安装,并推送到移动终端显示,移动终端根据用户的选择从服务器流式加载应用。该系统使得用户在切换位置时,不用下载、安装即可使用和当前位置相关的应用服务。实验表明,和传统应用分发模式相比,在3G网络环境下可以减少64.37%的应用获取时延,在4G网络环境下可以减少74.49%的应用获取时延。     

3G技术对数字图书馆的影响

3G是近年来兴起的前沿无线通信技术,依托3G网络的数字图书馆将成为用户获取信息的重要途径。分析了现代阅读方式的变化即:移动化和多媒体化,进而阐述了3G技术与数字图书馆的融合,以及在3G背景下数字图书馆建设中应该注意的问题,并给出方法与措施。     

移动计算环境下远程用户体验数据挖掘方法研究

在移动计算环境下,通过对远程用户的体验数据优化挖掘,满足远程用户的个性化需求,提高对远程用户QoS服务质量;传统的数据挖掘方法采用显著特征关联信息提取算法,当远程用户体验数据之间的差异性特征不明显时,挖掘的准确性不好;提出一种基于关联用户自适应链路跟踪补偿的移动计算环境下远程用户体验数据挖掘模型,进行远程用户体验数据挖掘模型的总体设计和数据结构特征分析,对采集的远程用户体验数据进行非线性时间序列分解,对数据序列通过自相关特征匹配和特征压缩实现挖掘数据的指向性信息优化提取,采用关联用户自适应链路跟踪补偿方法实现对数据挖掘误差的控制和补偿,提高了数据挖掘的准确性和有效性;仿真结果表明,采用该挖掘方法进行移动计算环境下远程用户体验数据挖掘的准确度高,实时性较好,满足了移动远程用户的个性化需求,提高了对用户服务的针对性。     

面向边缘计算的属性加密方案

传统云环境下的属性加密方案在判定用户访问权限时通常仅依据年龄和职业等用户常规属性,而忽视了访问时间和位置的约束问题。为较好满足边缘计算的实时性和移动性需求,提出一种支持时间与位置约束的多授权外包属性加密方案。通过将时间域与位置域信息同时引入属性加密过程,实现更细粒度的访问控制。采用多授权机构共同管理属性信息,解决单授权机构的性能瓶颈问题,满足用户跨域访问需求。针对边缘计算中移动终端资源受限问题,将大部分解密计算外包至边缘节点,减轻移动终端设备负担。分析结果表明,在边缘计算环境下,该方案以较低的计算和存储开销实现了具有时间和位置约束的访问控制,并且可有效保障用户数据安全。     

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.     

云计算在数字化图书馆建设中的应用

云计算将图书馆海量数字资源存储带入了新的时代.随着时代的变迁,图书馆及其用户对海量存储系统的要求也在不断地提升,因此无论多么完善的技术都会遇到瓶颈问题,云计算技术当然也不例外.为了使数字化图书馆的云计算技术走的更远,应该从各个方面找到云计算已经遇到或可能遇到的瓶颈问题,对其进行改进,使其更好的为数字化图书馆和用户服务.     

“科研在线”平台文档的移动客户端

云计算和移动智能终端的发展极大地改变了人们的生活,也为协同工作带来更多的便利。科研在线平台中的协同文档库是基于云存储的协同工具,为用户提供面向团队的文档协作与管理服务。本文的工作是设计并实现了基于 iOS 的协同文档库移动客户端。通过对用户使用场景的分析,得出系统功能。根据移动应用的特点,设计系统框架。本文主要从网络编程、数据缓存和登录认证这三个方面的关键技术来描述系统的实现。     

Implementation of an intelligent personalized digital library system based on improved negotiation mobile multiagents

There are several problems in searching the database of an existing digital library. To overcome some problems, I propose a new platform of mobile multiagents for a personal digital library. To develop a new platform, I propose a distributed mobile multiagent framework (DMMAF) agent. For the higher relationships among searched documents from mobile servers, an unsupervized neural network is applied. For the user's preference, some modular clients are applied to a neural network. A multiagent platform and a mobile agent platform are combined to develop a new mobile multiagent platform so as to decrease the network burden. A new negotiation algorithm and a scheduling algorithm are also activated for the effectiveness of the personal digital library system (PDLS). PDLS is a more intelligent system capable of establishing a database in the computer by learning the interests of users. We tried to set up the theoretical structure of the multimobile agents, and develop an algorithm for a modified intelligent negotiation agent for inducing interaction among multiagents. This work was presented in part at the 11th International Symposium on Artificial Life and Robotics, Oita, Japan, January 23–25, 2006     

Secure Encrypted Steganography Graphical Password scheme for Near Field Communication smartphone access control system

The revolutionary development of smartphone which offers compelling computing and storage capabilities has radically changed the digital lifestyles of users. The integration of Near Field Communication (NFC) into smartphone has further opened up opportunities for new applications and business models such as in industry for payment, electronic ticketing and access control systems. NFC and graphical password scheme are two imperative technologies that can be used to achieve secure and convenient access control system. One of the potential uses of such technologies is the integration of steganography graphical password scheme into NFC-enabled smartphone to transcend conventional digital key/tokens access control systems into a more secure and convenient environment. Smartphone users would have more freedom in customizing the security level and how they interact with the access control system. As such, this paper presents a secure two-factor authentication NFC smartphone access control system using digital key and the proposed Encrypted Steganography Graphical Password (ESGP). This paper also validates the user perception and behavioral intention to use NFC ESGP smartphone access control system through an experiment and user evaluation survey. Results indicated that users weigh security as a dominant attribute for their behavioral intention to use NFC ESGP smartphone access control system. Our findings offer a new insight for security scholars, mobile device service providers and expert systems to leverage on the two-factor authentication with the use of NFC-enabled smartphone.     

Mobile collaborative medical display system

Because of recent advances in wireless communication technologies, the world of mobile computing is flourishing with a variety of applications. In this study, we present an integrated architecture for a personal digital assistant (PDA)-based mobile medical display system that supports collaborative work between remote users. We aim to develop a system that enables users in different regions to share a working environment for collaborative visualization with the potential for exploring huge medical datasets. Our system consists of three major components: mobile client, gateway, and parallel rendering server. The mobile client serves as a front end and enables users to choose the visualization and control parameters interactively and cooperatively. The gateway handles requests and responses between mobile clients and the rendering server for efficient communication. Through the gateway, it is possible to share working environments between users, allowing them to work together in computer supported cooperative work (CSCW) mode. Finally, the parallel rendering server is responsible for performing heavy visualization tasks. Our experience indicates that some features currently available to our mobile clients for collaborative scientific visualization are limited due to the poor performance of mobile devices and the low bandwidth of wireless connections. However, as mobile devices and wireless network systems are experiencing considerable elevation in their capabilities, we believe that our methodology will be utilized effectively in building quite responsive, useful mobile collaborative medical systems in the very near future.     

移动环境下基于移动代理的应用框架设计

随着网络技术的发展和移动设备的普及，用户希望能随时随地对资源进行访问。但是，由于移动网络连接带宽低且移动单元本身资源贫乏，移动环境为分布应用开发提出了新的挑战。移动代理技术以其节省带宽、异步性等特征，为移动计算提供了良好的解决方案。本文首先讨论了移动代理系统的设计，然后提出一个基于移动代理的移动应用框架
架，最后给出了相应的应用实例。     

Guest Editors' Introduction: Energy Harvesting and Conservation

Pervasive computing aims to integrate computation into our daily work practice to enhance our activities without being noticed. In other words, computing becomes truly invisible. Yet at the heart of every pervasive computing system are electronic components that consume energy. Managing the energy needs of mobile systems, or systems for which reliable power isn’t guaranteed, can be a significant distraction for users. How can we minimize user involvement in the energy management process to make pervasive computing devices more pervasive?     

基于本体的个性化领域信息服务

以数字图书馆领域个性化服务为例,以空间向量模型表示用户兴趣和资源特征,并借助于构建的领域本体和“知网”知识词典对向量进行概念上的扩展,形成用户和资源特征概念空间向量,并通过向量相似度计算寻找最优的资源,从而为用户提供个性化信息服务。实验数据说明了基于概念的相似度计算比基于关键词的相似度计算具有更明显的优越性。