4G网络中位置服务业务解决方案

本文讨论如何综合考虑4G网络不同发展时期的网络特点和位置服务方案,给出在4G网络中部署位置服务增值业务解决方案的建议。     

移动通信网变革承载移动互联网梦想成真

移动通信网一代代的变革,通过核心网、无线接入和终端的演进一步步推进或满足着不断出现的移动互联网业务.如今它已然是最大的移动互联网,而其它渐渐成为该移动互联网的承载网或是互联子网.未来它承载着"移动互联网+"梦想改变我们的生活、工作、学习和社会的方方面面.     

基于Chord的移动对等网络资源路由算法

针对移动P2P云环境下节点由于移动太快导致路由算法失效的问题,提出一种基于Chord资源路由算法。该算法修改基本路由结构,并设置实时机制和检查机制,实时机制在每次查找过程中实时修改路由信息,检查机制是检查路径节点是否为有效节点,并修改路径节点路由信息,提供给下次查询使用。实验结果表明,该算法有效提高查询成功率,同时减少查询延时。     

A smartphone‐based U‐Healthcare system for real‐time monitoring of acute myocardial infarction

In recent years, medical service has been evolving from systems designed around centralized hospitals to Ubiquitous Healthcare (U‐Healthcare). U‐Healthcare system can facilitate real‐time monitoring of patient states, and can provide medical checkups and management whenever and wherever the medical staff deems necessary. U‐Healthcare services can provide chronic condition monitoring in the early stages of diseases and help execute decisive medical action in emergencies. However, thus far, the application of U‐Healthcare systems has been limited to diseases such as obesity, diabetes, etc. Acute myocardial infarction (AMI) is among the most critical chronic diseases and requires early detection and treatment. In this paper, we propose an AMI diagnostic software technique and protocol that can support real‐time communication between the patient and medical personnel. Our monitoring and diagnostic system has been developed using a protocol based on ISO/IEEE 11073. When data is transferred from the patient's smartphone to a server in hospital, the medical personnel consult the patient's biosensor data to determine the status of the relevant disease and provide appropriate medical service. The relevant information is sent back to the patient's smartphone through a wireless network, and patients can view their data in graphical format through their smartphone. Copyright © 2015 John Wiley & Sons, Ltd.     

Mobile Small Cells for Further Enhanced 5G Heterogeneous Networks

A heterogeneous network (HetNet) is a network topology composed by deploying multiple HetNets under the coverage of macro cells (MCs). It can improve network throughput, extend cell coverage, and offload network traffic; for example, the network traffic of a 5G mobile communications network. A HetNet involves a mix of radio technologies and various cell types working together seamlessly. In a HetNet, coordination between MCs and small cells (SCs) has a positive impact on the performance of the networks contained within, and consequently on the overall user experience. Therefore, to improve user‐perceived service quality, HetNets require high‐efficiency network protocols and enhanced radio technologies. In this paper, we introduce a 5G HetNet comprised of MCs and both fixed and mobile SCs (mSCs). The featured mSCs can be mounted on a car, bus, or train and have different characteristics to fixed SCs (fSCs). In this paper, we address the technical challenges related to mSCs. In addition, we analyze the network performance under two HetNet scenarios — MCs and fSCs, and MCs and mSCs.     

基于轨道移动激光扫描的圆形隧道正射影像纠正算法

高质量的隧道内壁影像是隧道病害检测的基础,而基于轨道移动激光扫描技术采集的圆形隧道内壁影像,在断面方向和运动方向上存在较大的影像长度误差。本文提出一种基于轨道移动激光扫描的圆形隧道正射影像纠正算法,利用速度纠正和正射投影纠正,插值激光扫描数据生成隧道内壁影像。经实验证明,该算法可有效纠正圆形隧道内壁影像在断面方向和运动方向上的长度误差,使影像具有较为精确的面积量测和病害信息判读功能。     

Coupling human mobility and social ties

Studies using massive, passively collected data from communication technologies have revealed many ubiquitous aspects of social networks, helping us understand and model social media, information diffusion and organizational dynamics. More recently, these data have come tagged with geographical information, enabling studies of human mobility patterns and the science of cities. We combine these two pursuits and uncover reproducible mobility patterns among social contacts. First, we introduce measures of mobility similarity and predictability and measure them for populations of users in three large urban areas. We find individuals'' visitations patterns are far more similar to and predictable by social contacts than strangers and that these measures are positively correlated with tie strength. Unsupervised clustering of hourly variations in mobility similarity identifies three categories of social ties and suggests geography is an important feature to contextualize social relationships. We find that the composition of a user''s ego network in terms of the type of contacts they keep is correlated with mobility behaviour. Finally, we extend a popular mobility model to include movement choices based on social contacts and compare its ability to reproduce empirical measurements with two additional models of mobility.     

Mobile Design as Neighborhood Acupuncture: Activating the Storytelling Networks of South Los Angeles

Abstract

A delicate touch is required to empower neighborhoods using civic media. Funding is persistently scarce. Especially in marginalized neighborhoods, blunt designs can be counterproductive and even entrench complex problems. New metaphors may be needed to guide design and empower local neighborhoods. Urban acupuncture is used as the basis for this study, emphasizing a light-touch strategy that has shown success in Brazil with urban transit, and more recently in Europe with urban design. We specifically propose “neighborhood acupuncture” to address the local level, tapping the sociology of place-based communication. To investigate the implications for systematic design, a case study is probed in South Los Angeles using mobile media for community mapping. Using qualitative methods, three tactics were investigated for the potential to “poke” the network into action, including one to bridge diverse storytelling networks. Each tactic ultimately seeks to build the capacity for collective action around neighborhood issues. Acupuncture is broadly argued to sustain two design shifts: first to help approach neighborhoods as ecosystems, and second, to design for circulation rather than any single technology platform.     

浅谈防疫用移动方舱开发制造与检测验证现状

防疫用移动方舱从原理和功能上属于受控洁净空间,目前没有专用制造标准与验证方法,一般沿用固定洁净室的制造测试方法。然而方舱在搭建、验证和使用过程中面临许多与固定式洁净室不同的细节问题,这主要源于方舱有限的空间条件,同时要兼顾成本、移动性和可靠性等。因此,基于已有相关技术标准与实际建造使用情况,对于方舱的专门制造标准和测试方法的讨论已经成为业内下一步工作的重要议题,以期对其有更有效合理的建造指导与质量管理,助力形成真正意义上的应急空间储备与快速投入使用的能力。     

天然气管道工程计算集成应用平台开发

针对天然气管道工程计算涉及专业广、内容庞杂、分析过程繁琐、应用层次多等难点,遵循现代天然气管道工程分析理论和方法,依据国内外现行规范和标准,结合各层次工程技术和管理人员的应用需求和特点,充分利用最新的计算机、网络、通信技术和智能移动设备,采用先进的系统集成和开发技术,实现了天然气管道工程分析方法的集成,形成了一套跨平台、跨专业、跨系统的天然气管道工程计算集成应用软件系统,搭建了针对不同系统的天然气管道工程计算集成应用平台,开发出了天然气管道专业Office工作系统,囊括了天然气管道工艺分析、工程计算、数据处理等多种应用工具。实例应用结果表明：该集成应用平台以工程师们习惯的方式进行工作并且提供相应的操作功能,为天然气管道系统的中心调度、日常管理和现场操作等各级、各层次专业技术人员提供了通用便捷的工具,且无须二次开发,提高了工作质量和效率;同时也为相关各级技术和管理人员提供了统一、全面的技术支持、工艺分析手段及交流平台,能有效促进团队协同以及各种资源、数据和结果的共享与协调。