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Client-Server Based LBS Architecture: A Novel Positioning Module for Improved Positioning Performance 基于客户端-服务器的LBS架构:一种提高定位性能的新型定位模块
Pub Date : 2010-07-01 DOI: 10.4018/jhcr.2010070101
M. Nabhan, S. A. Masri, V. Garaj, W. Balachandran, Z. Hunaiti
This work presents a new efficient positioning module that operates over client-server LBS architectures. The aim of the proposed module is to fulfil the position information requirements for LBS pedestrian applications by ensuring the availability of reliable, highly accurate and precise position solutions based on GPS single frequency L1 positioning service. The positioning module operates at both LBS architecture sides; the client mobile device, and the server positioning server. At the server side, the positioning module is responsible for correcting user's location information based on WADGPS corrections. In addition, at the mobile side, the positioning module is continually in charge for monitoring the integrity and available of the position solutions as well as managing the communication with the server. The integrity monitoring was based on EGNOS integrity methods. A prototype of the proposed module was developed and used in experimental trials to evaluate the efficiency of the module in terms of the achieved positioning performance. The positioning module was capable of achieving a horizontal accuracy of less than 2 meters with a 95% confidence level with integrity improvement of more than 30% from existing GPS/EGNOS services.
这项工作提出了一个新的高效的定位模块,在客户端-服务器LBS架构上运行。该模块旨在通过提供基于GPS单频L1定位服务的可靠、高精度、精确的定位解决方案,满足LBS行人应用的位置信息需求。定位模块在LBS架构两侧运行;客户端为移动设备,服务器端为定位服务器。在服务器端,定位模块负责根据WADGPS的校正对用户的位置信息进行校正。此外,在移动端,定位模块持续负责监控位置解决方案的完整性和可用性,并管理与服务器的通信。完整性监测采用EGNOS完整性监测方法。开发了该模块的原型,并将其用于实验试验,以评估该模块在实现定位性能方面的效率。定位模块能够实现低于2米的水平精度,95%的置信度,完整性比现有的GPS/EGNOS服务提高30%以上。
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引用次数: 17
On Balancing Energy Consumption, Rendering Speed, and Image Quality on Mobile Devices 在移动设备上平衡能耗、渲染速度和图像质量
Pub Date : 2010-07-01 DOI: 10.4018/jhcr.2010070104
Fan Wu, E. Agu, Clifford Lindsay, Chung-Han Chen
Mobile games and graphics are popular because un-tethered computing is convenient and ubiquitous entertainment is compelling. However, rendering graphics on mobile devices faces challenges due to limited system resources, such as battery energy, and low memory and disk space. Real time frame rates, low energy consumption and high image quality are all desirable attributes of interactive mobile graphics; however, achieving these objectives is conflicting. For instance, increasing mesh resolutions improves rendered image quality but consumes more battery energy. Therefore, the authors propose a mobile graphics heuristic to minimize energy consumption while maintaining acceptable image quality and interactive frame rates. Over the lifetime of a mobile graphics application, scene complexity, animation paths, user interactivity and other elements all change its CPU and resource demands. In this regard, a heuristic that dynamically changes scene mesh LoDs and amount of CPU timeslices allotted to the mobile graphics application is presented to select optimal operating conditions that balance rendering speed, energy conservation and image quality. Additionally, a workload predict model is proposed so that the heuristic can monitor both application workload and the availability of resources of mobile devices periodically, while adaptively determining how much resources will be allocated to applications.
手机游戏和图像之所以受欢迎,是因为不受束缚的计算很方便,无处不在的娱乐很吸引人。然而,由于有限的系统资源(如电池能量、低内存和磁盘空间),在移动设备上渲染图形面临挑战。实时帧率、低能耗和高图像质量都是交互式移动图形的理想属性;然而,实现这些目标是相互矛盾的。例如,增加网格分辨率可以提高渲染图像的质量,但会消耗更多的电池能量。因此,作者提出了一种移动图形启发式算法,在保持可接受的图像质量和交互帧率的同时,将能耗降至最低。在移动图形应用程序的生命周期中,场景复杂性、动画路径、用户交互性和其他元素都会改变其CPU和资源需求。在这方面,提出了一种动态改变场景网格负载和分配给移动图形应用程序的CPU时间片数量的启发式方法,以选择平衡渲染速度,节能和图像质量的最佳操作条件。此外,提出了一个工作负载预测模型,使启发式算法可以定期监控应用程序工作负载和移动设备资源的可用性,同时自适应地确定将多少资源分配给应用程序。
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引用次数: 3
Indoor Positioning Using FM Radio 利用调频收音机进行室内定位
Pub Date : 2010-07-01 DOI: 10.4018/jhcr.2010070102
Andrei Papliatseyeu, V. Osmani, O. Mayora-Ibarra
This paper presents an indoor positioning system based on FM radio. The system is built on commercially available short-range FM transmitters. This is the first experimental study of FM performance for indoor localisation. FM radio possesses a number of features, which make it distinct from other localisation technologies. Despite the low cost and off-the-shelf components, this FM positioning system reaches a high performance, comparable to other positioning technologies such as Wi-Fi. The authors' experiments have yielded a median accuracy of 1.0 m and in 95% of cases the error is below 5 m.
提出了一种基于调频广播的室内定位系统。该系统建立在商用的短距离调频发射机上。这是第一个室内定位调频性能的实验研究。调频广播具有许多特点,这使它有别于其他本地化技术。尽管该调频定位系统的成本低,且组件现成,但其性能可与Wi-Fi等其他定位技术相媲美。作者的实验得出的中值精度为1.0 m,在95%的情况下误差小于5 m。
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引用次数: 21
Design and Implementation of Binary Tree Based Proactive Routing Protocols for Large MANETS 大型MANETS中基于二叉树的主动路由协议的设计与实现
Pub Date : 2010-06-23 DOI: 10.4018/jhcr.2011100105
Pavan Kumar Pandey, G. P. Biswas
The Mobile Ad hoc Network MANET is a collection of connected mobile nodes without any centralized administration. Proactive routing approach is one of those categories of proposed routing protocol which is not suitable for larger network due to their high overhead to maintain routing table for each and every node. The novelty of this approach is to form a binary tree structure of several independent sub-networks by decomposing a large network to sub-networks. Each sub-network is monitored by an agent node which is selected by several broadcasted regulations. Agent node maintains two routing information; one for local routing within the sub-network and another for routing through all other agent node. In routing mechanism first source node checks for destination within sub-network then source sends destination address to respective parent agent node if destination is not available in local routing, this process follows up to the destination node using agent mode. This approach allowed any proactive routing protocol with scalability for every routing mechanism. The proposed approach is thoroughly analyzed and its justification for the connectivity through sub-networks, routing between each source to destination pair, scalability, etc., are given, which show expected performance.
移动自组织网络(MANET)是连接的移动节点的集合,没有任何集中管理。主动路由方法是一类被提出的路由协议,由于维护每个节点路由表的开销很大,不适合大型网络。该方法的新颖之处在于将一个大的网络分解为多个独立的子网,形成一个二叉树结构。每个子网由一个代理节点监控,该代理节点由几个广播规则选择。代理节点维护两个路由信息;一个用于子网内的本地路由,另一个用于通过所有其他代理节点进行路由。在路由机制中,源节点首先检查子网内的目的地址,如果本地路由中没有目的地址,则源节点将目的地址发送给各自的父代理节点,这一过程使用代理模式跟踪到目的节点。这种方法允许任何具有可扩展性的主动路由协议适用于每种路由机制。对该方法进行了深入的分析,并给出了其通过子网的连通性,每个源到目标对之间的路由,可扩展性等方面的理由,显示出预期的性能。
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引用次数: 7
A 2D Barcode Validation System for Mobile Commerce 面向移动商务的二维条码验证系统
Pub Date : 2010-05-10 DOI: 10.4018/jhcr.2011040101
David Kuo, Daniel Wong, J. Gao, Lee Chang
The widely deployment of wireless networks and mobile technologies and the significant increase in the number of mobile device users have created a very strong demand for emerging mobile commerce applications and services Barcode-based identification and validation solutions have been considered as an important part of electronic commerce systems, particularly in electronic supply chain systems This paper reports a mobile-based 2D barcode validation system as a part of mobile commerce systems This barcode-based validation solution is developed based on the Data Matrix 2D-Barcode standard to support barcode-based validation in mobile commerce systems on mobile devices Furthermore, the paper also demonstrates its application by building a mobile movie ticketing system.
无线网络和移动技术的广泛部署以及移动设备用户数量的显著增加,对新兴的移动商务应用和服务产生了非常强烈的需求,基于条形码的识别和验证解决方案已被认为是电子商务系统的重要组成部分。本文报道了一种基于移动的二维条码验证系统作为移动商务系统的一部分,这种基于条码的验证解决方案是基于数据矩阵二维条码标准开发的,以支持移动设备上的移动商务系统中的基于条码的验证。此外,本文还通过构建移动电影票务系统来演示其应用。
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引用次数: 13
Applying Commonsense Reasoning to Place Identification 将常识推理应用于地点识别
Pub Date : 2010-04-01 DOI: 10.4018/jhcr.2010040103
M. Mamei
Recent mobile computing applications try to automatically identify the places visited by the user from a log of GPS readings. Such applications reverse geocode the GPS data to discover the actual places shops, restaurants, etc. where the user has been. Unfortunately, because of GPS errors, the actual addresses and businesses being visited cannot be extracted unambiguously and often only a list of candidate places can be obtained. Commonsense reasoning can notably help the disambiguation process by invalidating some unlikely findings e.g., a user visiting a cinema in the morning. This paper illustrates the use of Cyc-an artificial intelligence system comprising a database of commonsense knowledge-to improve automatic place identification. Cyc allows to probabilistically rank the list of candidate places in consideration of the commonsense likelihood of that place being actually visited on the basis of the user profile, the time of the day, what happened before, and so forth. The system has been evaluated using real data collected from a mobile computing application.
最近的移动计算应用程序试图从GPS读数日志中自动识别用户访问过的地方。此类应用程序对GPS数据进行反向地理编码,以发现用户去过的商店、餐馆等实际地点。不幸的是,由于GPS错误,无法明确地提取被访问的实际地址和企业,通常只能获得候选地点的列表。常识性推理可以通过使一些不太可能的发现无效来显著地帮助消歧过程,例如,用户在早上去电影院。本文介绍了使用cyc——一个包含常识性知识数据库的人工智能系统来改进自动地点识别。Cyc允许对候选地点列表进行概率排序,根据用户配置文件、一天中的时间、之前发生的事情等,考虑该地点实际访问的常见性可能性。使用从移动计算应用程序收集的真实数据对该系统进行了评估。
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引用次数: 15
A Novel Energy Saving Approach through Mobile Collaborative Computing Systems 一种基于移动协同计算系统的新型节能方法
Pub Date : 2010-04-01 DOI: 10.4018/jhcr.2010040101
Xiaoxin Wu, Huan Chen, Yaoda Liu, Wenwu Zhu
Energy saving has been studied widely in both of computing and communication research communities. For handheld devices, energy is becoming a more and more critical issue because lots of applications running on handhelds today are computation or communication intensive and take a long time to finish. Unlike previous work that proposes computing or communication energy solutions alone, this paper proposes a novel energy savings approach through mobile collaborative systems, which jointly consider computing and communication energy cost. In this work, the authors use streaming video as investigated application scenario and propose multi-hop pipelined wireless collaborative system to decode video frames with a requirement for maximum inter-frame time. To finish a computing task with such a requirement, this paper proposes a control policy that can dynamically adapt processor frequency and communication transmission rate at the collaborative devices. The authors build a mathematical energy model for collaborative computing systems. Results show that the collaborative system helps save energy, and the transmission rate between collaborators is a key parameter for maximizing energy savings. The energy saving algorithm in computing devices is implemented and the experimental results show the same trend.
节能在计算机和通信研究领域都得到了广泛的研究。对于手持设备来说,能源正成为一个越来越关键的问题,因为今天在手持设备上运行的许多应用程序都是计算或通信密集型的,并且需要很长时间才能完成。与以往单独提出计算或通信能源解决方案不同,本文提出了一种通过移动协作系统共同考虑计算和通信能源成本的新型节能方法。本文以流媒体视频为研究应用场景,提出了多跳流水线式无线协同系统,在最大帧间时间的要求下对视频帧进行解码。为了完成这样的计算任务,本文提出了一种可以动态调整协同设备上处理器频率和通信传输速率的控制策略。作者建立了协作计算系统的数学能量模型。结果表明,协作系统有助于节能,协作者之间的传输速率是实现节能最大化的关键参数。在计算设备上实现了节能算法,实验结果显示出相同的趋势。
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引用次数: 3
Mobile Multimedia Streaming Using Secure Multipath in Wireless Ad Hoc Networks 在无线自组织网络中使用安全多路径的移动多媒体流
Pub Date : 2010-04-01 DOI: 10.4018/jhcr.2010040104
Lei Chen, Chung-wei Lee
Supporting reliable and secure multimedia streaming service is a challenging task in the environment of wireless Mobile Ad hoc Networks MANETs where radio signals are prone to security attacks and the quality of media streaming is degraded by signal strength loss and interference. The mobility of mobile devices makes streaming even more difficult as communication links are often broken when the devices move out of the transmission range of their neighbors. This paper proposes a stable multipath routing algorithm and an intelligent secure data distribution scheme for multimedia streaming in MANETs. The multipath Neighbor Stability Routing is able to find more stable and long-lasting paths than traditional ad hoc routing algorithms. The secure data distribution takes historical data-path distribution into consideration and maximally disperses new multimedia data to reduce the possibility of information leakage to unauthorized parties. The authors' simulation and analysis indicate that the combination of these two mechanisms can provide high quality paths to achieve secure multimedia streaming.
在无线移动自组织网络(manet)环境下,支持可靠、安全的多媒体流媒体服务是一项具有挑战性的任务。无线移动自组织网络(manet)的无线信号容易受到安全攻击,流媒体的质量受到信号强度损失和干扰的影响。移动设备的移动性使得流媒体更加困难,因为当设备移动到其邻居的传输范围之外时,通信链路往往会中断。提出了一种稳定的多径路由算法和一种智能安全的数据分发方案。与传统的自组织路由算法相比,多路径邻居稳定路由能够找到更稳定、更持久的路径。安全的数据分发考虑了历史数据路径的分布,最大限度地分散新的多媒体数据,减少信息泄露给未授权方的可能性。仿真和分析表明,这两种机制的结合可以为实现安全的多媒体流提供高质量的路径。
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引用次数: 9
A Collaborative Replication Approach for Mobile-P2P Networks 移动p2p网络的协同复制方法
Pub Date : 2010-04-01 DOI: 10.4018/jhcr.2010040105
Anirban Mondal, S. Madria, M. Kitsuregawa
This paper proposes CADRE Collaborative Allocation and De-allocation of Replicas with Efficiency, which is a dynamic replication scheme for improving the typically low data availability in dedicated and cooperative mobile ad-hoc peer-to-peer M-P2P networks. In particular, replica allocation and de-allocation are collaboratively performed in tandem to facilitate effective replication. Such collaboration is facilitated by a hybrid super-peer architecture in which some of the mobile hosts act as the 'gateway nodes' GNs in a given region. GNs facilitate both search and replication. The main contributions of CADRE are as follows. First, it facilitates the prevention of 'thrashing' conditions due to its collaborative replica allocation and de-allocation mechanism. Second, it considers the replication of images at different resolutions to optimize the usage of the generally limited memory space of the mobile hosts MHs. Third, it addresses fair replica allocation across the MHs. Fourth, it facilitates the optimization of the limited energy resources of MHs during replication. The authors' performance evaluation demonstrates that CADRE is indeed effective in improving data availability in M-P2P networks with significant reduction in query response times and low communication traffic during replication as compared to a recent existing scheme as well as a baseline approach, which does not consider any replication.
本文提出了一种有效的CADRE副本协同分配和撤销方案,它是一种动态复制方案,用于改善专用和协作式移动自组织点对点M-P2P网络中数据可用性低的问题。特别是,副本分配和取消分配是协同执行的,以促进有效的复制。这种协作是由一种混合的超级对等架构促进的,在这种架构中,一些移动主机充当给定区域的“网关节点”gn。GNs促进了搜索和复制。CADRE的主要贡献如下:首先,由于它的协作副本分配和取消分配机制,它有助于防止“震荡”情况。其次,它考虑了不同分辨率下图像的复制,以优化移动主机mh普遍有限的内存空间的使用。第三,它解决了在mh之间公平分配副本的问题。第四,有利于mh在复制过程中有限的能量资源的优化。作者的性能评估表明,与最近的现有方案以及不考虑任何复制的基线方法相比,CADRE确实有效地提高了M-P2P网络中的数据可用性,在复制期间显著减少了查询响应时间和低通信流量。
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引用次数: 5
A Measurement Framework of Mobile Service Adoption 移动服务采用的度量框架
Pub Date : 2010-04-01 DOI: 10.4018/jhcr.2010040102
H. Verkasalo
This paper discusses conceptual definitions of mobile service users. These concepts reflect the domains of end-users having an intention to use the service or using the service in practice. This study also defines metrics that measure the adoption of mobile services. In addition, the paper investigates the estimation of costs due to mobile service adoption gaps. The paper demonstrates the use of the invented metrics with a data set collected from a sample of Finnish early-adopter smartphone users in 2007. Based on this data set, a ranking of mobile services is presented based on adoption-related success factors. In addition, the potential loss of perceived end-user value, that is due to adoption gaps, is estimated. The notable conclusion is that though most new mobile services experience significant adoption gaps, the value loss is only 10% in the long-term and 3% in the short-term, relative to the use of existing services.
本文讨论了移动业务用户的概念定义。这些概念反映了有意使用服务或在实践中使用服务的最终用户的领域。该研究还定义了衡量移动服务采用情况的指标。此外,本文还研究了由于移动服务采用差距而导致的成本估计。本文用2007年芬兰早期智能手机用户样本收集的数据集演示了发明指标的使用。在此数据集的基础上,根据采用相关的成功因素给出了移动服务的排名。此外,还估计了由于采用差距导致的终端用户价值的潜在损失。值得注意的结论是,尽管大多数新的移动服务经历了巨大的采用差距,但相对于现有服务的使用,长期价值损失仅为10%,短期价值损失仅为3%。
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引用次数: 3
期刊
Int. J. Handheld Comput. Res.
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