基于位置的服务中数据预取策略的应用研究

由于受网络环境和嵌入式移动数据库等自身工作环境和软硬件条件的限制,用户在申请基于位置的服务时,存在数据传输不稳定,频繁连接服务数据库,服务响应时间过长等缺点.为了能更好的为用户服务,减少服务等待时间,提高服务质量,文章改进关联规则方法,挖掘位置服务中用户的使用模式,预测用户下一步可能申请的服务类型,从而可以预取相关服务数据到用户移动设备,能够减少用户等待数据调用和传输的时间,优化服务质量,提高嵌入式移动数据库的工作效率.     

Towards a Mobile Multimedia Age – Location-Based Services: A Case Study

Japan has been at the leading edge of location-based services (LBS) deployment using wireless assisted GPS technology. These services, which include personal security, navigation, gaming, security and fleet management, have experienced tremendous growth over the last few years. By looking at the factors contributing to this successful growth, LBS can be deployed in Europe with equal success. In addition to success factors, it is important to look at the underlying wireless network technology and its deployment impact, since Japanese deployments are based on synchronous 3G whereas Europe's likely deployments will be based on asynchronous UMTS. Recognizing the implication of both these items in accordance with SnapTrack's vision of UMTS LBS deployment affords a service provider a better opportunity to successfully introduce LBS and drive service revenue. This revised version was published online in August 2006 with corrections to the Cover Date.     

位置服务平台解决方案

本文讨论了东信北邮信息技术有限公司位置服务平台的系统总体结构设计、功能模块设计、进程拓扑图.     

位置社交网络的潜在好友推荐模型研究

为了提高位置社交网络的服务便捷性和用户感受度,与位置相关的推荐服务越来越具有重要意义和应用需求.提出的潜在好友推荐模型主要是根据签到位置的相似度及好友相似度进行潜在用户推荐.通过用户的好友关系、签到特性及签到历史记录,计算用户在各个位置兴趣点的位置权重,再分别利用位置权重及好友关系计算用户的位置相似度和好友相似度,最后根据用户位置和好友关系的综合相似度进行潜在用户推荐.实验结果表明,提出的潜在好友推荐模型是切实有效的.     

移动位置服务中网络地图服务迁移研究

分析对比了移动位置服务中现有的C/S和B/S两种地图服务模式。针对移动服务的特点,从提高用户的使用体验角度,提出一种基于B/S模式的网络电子地图服务迁移架构——MobileWMS,实现了地图服务、地图服务应用和地图数据等的分离与迁移。构建了系统原型并阐述了主要功能模块的实现。实验测试验证了该架构的可行性,与传统的静态、集中式的B/S地图服务模式相比,服务性能有明显的改善。     

基于位置服务的移动应用

随着4G网络的广泛应用,基于位置服务的应用不断扩展。本文分别介绍位置服务平台系统的网络架构及系统功能,最后引入人员定位系统、车辆管理系统等应用。     

第三代移动通信网的位置服务体系结构

讨论了3GPPUTRAN第三代移动系统标准的客户服务端体系结构和操作,以及在未来移动通信网络中的应用。     

An OSA/Parlay-Based Middleware Architecture for Location-Based Services

The shift of the telecommunication world towards Next Generation Networks (NGNs) has triggered the interest in location-based services (LBSs) for service providers. This interest has elevated the need for seamless access to location information by anyone wishing to evade the overhead of adapting to proprietary interfaces. This paper discusses the use of Open Application Interfaces to unify the access to location information maintained by network components and describes the implementation of a middleware gateway to location information, which complies with these open interfaces. Additionally, the performance of different distributed technologies providing access to the gateway is evaluated.     

Enriching user experiences with location-sensitive music services

Abstract

The wide adoption of mobile devices and streaming music services has paved the way for location-based music services. However, there has not yet been any commercial breakthrough. We designed OUTMedia, a location-sensitive music discovery application with unique features, to explore rewarding user interactions. This article reports the design efforts and a field study of the functional prototype. We utilised user interviews, log data and the ResQue instrument to study use and user experience of the prototype. All measures found the overall concept feasible and the use of the application resulted in serendipitous experiences of music and places. Our findings call for service designers to support the interplay between media and places in personal meaning-making processes, to enrich urban cultural experiences with user-created information layers that accumulate over time. The design implications can be used to support serendipitous music experiences through the interplay between places and media in future content discovery services.     

一种在Internet网络上承载QoS业务的体系模型──综合服务模型

对综合服务模型这种可以在TCP／IP网络上承载QoS的体系结构作了全面的介绍，对它提供的业务类型，体系结构，及如何实现作了系统的阐述。     

基于云计算的手机图书馆服务整合探析

随着手机图书馆成为图书馆服务的新阵地,越来越多的图书馆的传统服务在手机图书馆上体现出新的生命力。依赖于云计算技术的手机图书馆克服了手机作为服务终端所存在的服务瓶颈,成为手机图书馆的最佳搭档。本文探讨了手机云计算以及其优势,以及在云计算环境下,手机图书馆的服务整合理念和模式。     

Mobile Cloud for Personalized Any-Media Services

In this paper,we define mobile cloud computing and describe how it can be used for delivering advanced any-media services to both nomadic and mobile users.We focus on service delivery that is localized and personalized and suggest that virtualization and tighter cross-layer communication allows for convergence and seamless transition of services.These are also creating new and never-before seen ways of developing and delivering personalized any-media services.We discuss current paradigms for implementing cloud-based any-media services that generate revenue.Future research topics and requirements for evolving network and service elements are also discussed.     

Effective Location Based Services with Dynamic Data Management in Mobile Environments

With the proliferation of mobile computing technologies, location based services have been identified as one of the most promising target application. We classify mobile information service domains based on feature characteristics of the information sources and different patterns of mobile information access. By carefully examining the service requirements, we identify the dynamic data management problem that must be addressed for effective location based services in mobile environments. We then devise a general architecture and cost model for servicing both location independent and location dependent data. Based on the architecture and cost model, we propose a set of dynamic data management strategies that employs judicious caching, proactive server pushing and neighborhood replication to reduce service cost and improve response time under changing user mobility and access patterns. Detail behavior analysis helps us in precisely capturing when and how to apply these strategies. Simulation results suggest that different strategies are effective for different types of data in response to different patterns of movement and information access. Shiow-yang Wu is an associate professor of the Department of Computer Science and Information Engineering at National Dong Hwa University, Hualien, Taiwan, R.O.C. He received the BS and MS degrees in computer engineering from National Chiao Tung University, Hsinchu, Taiwan, ROC, and the PhD degree in computer science from the University of Texas at Austin in 1984, 1986, and 1995, respectively. His research interests include data/knowledge bases, mobile computing, distributed processing, intelligence information systems, and electronic commerce. Kun-Ta Wu was born in Taipei, Taiwan, R.O.C., in 1976. He received the B.S. degree in computer science from Soochow University, Taipei, Taiwan, R.O.C., in 1999 and the M.S. degree in computer science and information engineering from National Dong Hwa University, Hualien, Taiwan, R.O.C., in 2001. Currently, he is an Assistant Researcher in the Domestic Division at Science and Technology Information Center, National Science Council, R.O.C., as a member of Information Gathering and Analysis Group of National Information and Communication Security Taskforce. His research interests include mobile computing, wireless network and information security.     

基于智能手机终端的数据业务质量监测系统的研究与实现

本文首先简要分析了移动数据业务的技术特点、发展趋势以及维护工作中存在的困难。然后,通过技术经济分析,提出了基于智能手机终端平台的质量监测系统的技术解决方案。最后,展望了应用前景。     

Location-Based Services in Mobile Communication Infrastructures

Location- and context-based services form a new class of services, which supplement existing services in the mobile communication infrastructure. The paper describes shortly an architecture of systems supporting the new class of services; this architecture extends beyond those systems which have initially been introduced by support of centralized data bases (such as web servers) and by federation components providing search and mapping functions which are necessary for the full exploitation of the capabilities of such services. The concept is based on the existence of heterogeneous mobile and radio access networks. The question arises, among others, to what extent such services add to the network load and its performance, in particular the question of scalability. In this paper, an approach is outlined as a basis for future capacity planning and for the support of strategic decision making with respect to infrastructure investments.     

云服务的解决方案探索

在对云计算与云服务进行阐述的基础上提出了如何高效提供云服务的解决方案,包括总体架构设计、功能结构设计及子系统模块设计等,针对目前存在的问题对云服务的发展前景进行了展望.     

基于位置服务的分布式差分隐私推荐方法研究

随着移动互联网技术的迅速发展,传统的推荐系统已不能很好地适应基于位置的推荐服务,同时也面临隐私泄露的问题.本文针对上述问题,首先提出一种分布式隐私保护推荐框架,并利用差分隐私保护理论,设计基于分布式框架的奇异值分解推荐算法,同时利用保序加密函数实现用户请求位置的保护.理论分析和在两个真实的数据集上的实验表明,本文提出的...     

PLBSD: a platform for proactive location-based service discovery

We introduce a platform for the rapid prototyping of proactive location-based service discovery, proactive location-based services are conceptualised along three broad categories: location-triggered services chain-triggered services, proximity-triggered services, and illustrated through a number of usage scenarios. We report on a workshop with designers and researchers in the area of location-based services that resulted in a set of initial requirements for the platform. We describe how the platform aims at addressing these requirements, and illustrate the implemented features through the development of a proactive location-based application.