移动位置服务系统设计

为了更好地说明目前在定位系统中常用的移动位置服务系统,采用软件设计的方法,对LBS体系结构的框架进行了分析,按照LBS系统体系要求,设计了LBS服务器端系统功能,通过实验测试,达到原定系统设计要求。说明移动位置服务系统在定位系统中的重要作用,其性能将直接决定定位系统的性能。设计的移动位置服务系统结构完整,性能优良,达到目前定位系统的各项要求。     

基于移动定位服务的考勤管理系统

针对传统考勤系统的缺点,提出了一种基于下一代网络服务的考勤管理实现方法,该方法结合移动定位服务和地理信息服务,对员工的移动终端进行实时定位,使用范围搜索算法确定员工是否在指定工作区内,生成考勤信息.可以实时或定时进行自动或手动考勤,并能记录和回放员工工作轨迹,是一种融合网络服务实现的低成本、高灵活性的基于位置的电信增值...     

Dynamic mechanical properties and instability behavior of layered backfill under intermediate strain rates

To obtain dynamic mechanical properties and failure rule of layered backfill under strain rates from 10 to 80 s^?1, impact loading test on layered backfill specimens (LBS) was conducted by using split Hopkinson pressure bar system. The results indicate that positive correlation can be found between dynamic compressive strength and strain rate, as well as between strength increase factor and strain rate. Dynamic compressive strength of LBS gets higher as the arithmetic average cement–sand ratio increases. Compared with static compressive strength, dynamic compressive strength of LBS is enhanced by 11% to 163%. In addition, the energy dissipating rate of LBS lies between that of corresponding single specimens, and it decreases as the average cement content increases. Deformation of LBS shows obvious discontinuity, deformation degree of lower strength part of LBS is generally higher than that of higher strength part. A revised brittle fracture criterion based on the Stenerding–Lehnigk criterion is applied to analyzing the fracture status of LBS, and the average relevant errors of the 3 groups between the test results and calculation results are 4.80%, 3.89% and 4.66%, respectively.     

基于GIS的移动通信位置服务

在LBS业务的基础上介绍了移动通信位置服务的分类和应用范围；综述了实现位置服务的网络和系统架构、定位技术及实现方案；并比较了各种实现方案的性能及特点；最后展望了移动定位业务的市场前景。     

基于Ontology的LBS应用研究

LBS和Ontology都是新兴的科学技术，因而基于Ontology的LBS应用研究还在初级阶段。本文介绍了Ontology的定义，研究现状和优点，着重介绍了运用Ontology为LBS建立位置本体，从而为用户提供个性化位置服务的应用。     

“基于LBS的社交网络”在城市公共空间管理与运营中的应用

互联网Web2.0时代背景下,在城市公共空间与空间使用者之间产生了大量互动需求,同时新的互联网技术也为城市公共空间与空间使用者进行互动提供了新的解决方案。其中,"基于位置的服务(Location Based Service简称LBS)的社交网络"便是目前最为成熟、有效的方式之一。本文介绍了"基于LBS的社交网络"的组成与内涵,并构建其在城市公共空间管理与运营中的应用模型。分别侧重于确定空间后对人群的细分以及获得人群信息后对适用空间的定位。同时,根据所建模型在武汉市湖北美术馆进行了两次运作实验。证明了"基于LBS的社交网络"在城市公共空间管理与运营中,能发挥促进空间与使用者互动的作用。     

GPS＋无线网络：混合定位助力LBS

LBS（Location-Based Service，定位服务）随着3G在中国部署的开始而再次成为运营商增值产品规划的焦点。移动运营商提供的无线网络位置服务业务虽然可以让用户无需购买GPS手机也能得到定位服务，但由于其精确度较低而一直未能实现大规模推广，而且目前GPS设备价格的大幅下滑也对运营商的狭义LBS业务形成新的威胁。     

3G时代运营商的移动位置服务发展策略

文章对我国移动位置类服务LBS的发展现状、业务发展的促进和抑制因素进行了研究,着重分析了我国开始运营3G业务之后LBS的发展机会,并给出了对3G运营商发展LBS的策略建议。     

On the inclusion of geographic information systems (GIS) in global navigation satellite systems (GNSS)

The latest innovation of the global navigation satellite systems (GNSS) technologies plays an important role in improving the quality and safety of modern life. Most of the applications evolved from the integration between GNSS, geographical information systems (GIS) and wireless communications and networking (WCN) systems. The wide spread applications that are using these technologies include: the automatic vehicle location (AVL), tracking systems, navigation systems, pedestrian navigation systems, intelligent transportation systems, precise positioning, and emergency callers, among others. The location‐based services (LBS) are possible only by the combination of GNSS, GIS and WCN. The growing need for commercial LBS has forced cellular‐phone and network manufacturers to concentrate on positioning solutions, which are even more precise than the regulatory mandates for positioning of emergency callers and other user services and applications. In this paper, we will present a literature review of the GNSS, the three satellite systems GPS, GLONASS and Galileo, which are aimed to support GNSS services, and a comparison between them and their role in creating a GIS. Copyright © 2006 John Wiley & Sons, Ltd.     

基于动态交通信息的移动位置服务系统

LBS应用已经从以“数据”为核心向以“服务”为核心转化，与具体应用领域的需求也结合得越来越紧密。然而，已有的位置服务系统主要基于静态数据．服务缺乏实时性，尤其在导航服务应用中，出行者对动态交通信息的需求越来越明显。从提供动态信息的移动位置服务的角度出发，以提供个人导航服务所需的交通信息为例，设计了一个基于动态交通信息的移动位置服务系统，并在此基础上在手机上实现了一个基于J2EE、J2ME和GPRS无线通信技术的原型系统。