Urban Sensing Based on Mobile Phone Data: Approaches,Applications, and Challenges

Data volume grows explosively with the proliferation of powerful smartphones and innovative mobile applications. The ability to accurately and extensively monitor and analyze these data is necessary. Much concern in cellular data analysis is related to human beings and their behaviours. Due to the potential value that lies behind these massive data, there have been different proposed approaches for understanding corresponding patterns. To that end, analyzing people’s activities, e.g., counting them at fixed locations and tracking them by generating origin-destination matrices is crucial. The former can be used to determine the utilization of assets like roads and city attractions. The latter is valuable when planning transport infrastructure. Such insights allow a government to predict the adoption of new roads, new public transport routes, modification of existing infrastructure, and detection of congestion zones, resulting in more efficient designs and improvement. Smartphone data exploration can help research in various fields, e.g., urban planning, transportation, health care, and business marketing. It can also help organizations in decision making, policy implementation, monitoring, and evaluation at all levels. This work aims to review the methods and techniques that have been implemented to discover knowledge from mobile phone data. We classify these existing methods and present a taxonomy of the related work by discussing their pros and cons.      

QoS Support in TDMA-Based Mobile Ad Hoc Networks

Mobile ad hoc networks (MANETs) are gaining a lot of attention in research lately due to their importance in enabling mobile wireless nodes to communicate without any existing wired or predetermined infrastructures. Furthermore, in order to support the growing need for multimedia and realtime applications, quality of service (QoS) support by the networking protocol is required. Several important QoS parameters that are needed by such applications can be identified. They include bandwidth, end-to-end delay, delay jitter, and bit error rate. A good amount of research has been developed in this area covering different issues and challenges such as developing routing protocols that support bandwidth reservation and delay management. In this paper, the current state of research for QoS support in TDMA-based MANETs at different layers of the networking model is presented and categorized. In addition, the current issues and future challenges involved in this exciting area of research are also included.     

IPTV的发展与挑战

近几年来，尽管总体看，电信业依然处于由网络泡沫、光纤泡沫和3G泡沫所构成的电信大泡沫破灭后的恢复过程中，但是电信大泡沫的破碎并没有停止电信技术和业务的发展势头，反而促进电信业以更加理性和有效的方式发展．一系列发展新势头已经开始显露。技术更新速度再次开始加快．建网成本继续大幅度下降，电信运营商压缩成本的努力已经接近底线，移动和IP对传统固网的冲击和分流日益严重，如此等等。面对新的形势，电信运营商如何适应？如何寻找到未来的增长点促进公司的持续增长？这是摆在全球电信运营商面前的共同课题。     

利用组播及QoS技术对IPTV网络进行优化

主要阐述了有关IPTV网络业务、组播协议、Qos协议和OPNET网络仿真软件的有关基础知识,同时阐述了在业务承载网中的IPTV网络的发展现状,研究IPTV可能出现的网络传输拥塞时的缺点,提出基于组播和QoS技术的IPTV承载网络组网方案。重点阐述了OPNET的模型层次与构建方式,并提出了OPNET网络模拟仿真的具体步骤,通过OPNET软件进行模拟仿真实验,仿真中,按照数据业务、IP语音业务、IPTV服务等三个类型,分别对网络发射数量、终端接收数据流量、网络时延值和网络抖动数值等进行测试仿真,同时对所收集的网络状态信息进行数据分析。通过仿真实验,可以发现在IPTV网络中使用Qos及组播,有效减轻业务网的流量负荷,减少传输时延,提高网络系统稳定性,从而保证了相关服务的顺利进行。     

移动应用集成:框架、技术与挑战

随着移动互联网的广泛普及和飞速发展,出现了大量的移动应用,其种类和数量还在不断增加.手机制造商、电信运营商和互联网服务提供商等纷纷推出自己的移动应用商店,移动应用已经成为互联网发展的一种新模式.移动应用的相关信息分布在应用商店、专业论坛及社交网络中,由于其信息的多样性、异构性、动态性,给移动应用集成带来了巨大挑战.移动应用集成的主要任务是研究如何把海量的移动应用及其相关信息有效地集成起来,为用户提供高质量的搜索、发现和推荐服务.移动应用集成还是一个比较新的研究领域,文中提出了一个移动应用集成的基本框架,对移动应用集成中的关键技术进行了分析总结,在此基础上对未来的研究方向及挑战进行了阐述.     

Guided Crowd Evacuation: Approaches and Challenges

Evacuation leaders and/or equipment provide route and exit information for people and guide them to the expected destinations, which could make crowd evacuation more efficient in case of emergency. The purpose of this paper is to provide an overview of recent advances in guided crowd evacuation. Different guided crowd evacuation approaches are classified according to guidance approaches and technologies. A comprehensive analysis and comparison of crowd evacuation with static signage, dynamic signage, trained leader, mobile devices, mobile robot and wireless sensor networks are presented based on a single guidance mode perspective. In addition, the different evacuation guidance systems that use high-tech means such as advanced intelligent monitoring techniques, AI techniques, computer technology and intelligent inducing algorithms are reviewed from a system’s perspective. Future researches in the area of crowd evacuation are also discussed.      

IP数字电视运营支撑系统的研究与设计

本文阐述了OSS的基本概念,研究分析了IP数字电视的业务模式,提出了OSS的设计方案.在此基础上,采用J2EE技术实现了系统架构.     

IP数字电视运营支撑系统的研究与设计

本文阐述了OSS的基本概念,研究分析了IP数字电视的业务模式,提出了OSS的设计方案。在此基础上,采用J2EE技术实现了系统架构。     

计算机网络服务质量优化方法研究综述

优化方法为设计更好的计算机网络服务质量保证机制提供了有力的理论支持.相较于传统启发式的网络设计方法,优化方法可以从理论上找到问题的最优解,从而从根本上克服了启发式方法不能证明方案优劣程度的缺陷.因此,基于优化方法的机制设计与性能评价成为了当前网络服务质量领域中的一个前沿研究领域.大量的研究着眼于从优化理论的角度重新建立...     

移动应用安全解析学:成果与挑战

随着移动应用(App)的广泛使用,移动应用的安全事件也频频发生。从数以亿计的移动应用中准确地识别出潜在的安全隐患成为了信息安全领域重要的难题之一。移动应用数量级增长的同时,也产生了海量的应用安全数据。这些数据使得移动应用的安全解析成为了可能。本文分别从用户界面解析、重打包应用检测、应用功能与安全行为一致性检测、基于上下文的恶意行为检测、终端用户应用管理和使用行为分析这五个方面介绍了移动应用安全解析学目前的成果。同时,基于以上的研究成果,对未来的研究方向进行了展望,并讨论了这些研究方向面临的挑战。     

QoS Negotiation and Renegotiation Based on Mobile Agents

As the Quality of Service （QoS） becomes increasingly important in the Internet development, there are more and more researches focusing on the issues of QoS negotiation. Mobile software agents represent a valid alternative to the implementation of strategies for the negotiation. In this paper, a QoS negotiation and renegotiation system architecture based on mobile agents is proposed. These agents perform the task in the whole process and therefore reduce the network load, overcome latency, and avoid frequent exchange information between clients and server. The simulation results show that it can improve the network resource utility about 10%.     

全IP移动网络中的动态资源预留机制与QoS研究

全IP移动网络中的QoS是最近的研究热点之一,其中资源预留协议(Resource ReserVation Protocol,RSVP)是一个关键技术。为了保证切换时的QoS,需要进行资源预留。针对RSVP不适应移动环境的缺点,文中在全IP移动网络的接入网的微移动域中,提出一种动态资源预留的QoS解决方案,实现微移动协议和RSVP协议之间的互操作。当有多个移动主机需要进行预留时,需要对它们进行优先级排序。文中提出了一种在全IP移动网络中基于信令预测优先级排队的动态排序算法,以有效地对多个移动主机进行资源预留。仿真结果表明文中提出的算法的有效性。     

移动环境下的MPLS及服务质量的实现

介绍了移动MPLS,同时分析了实现移动MPLS的关键技术,并且在研究分析了各种移动IP服务质量的基础上,提出了一种基于服务质量代理的移动IP QoS解决方案。     

Collaboration Challenges: Bridging the IT Support Gap

The more collaborative enterprises are, the better they perform. However, current collaboration technologies do not contribute as much as expected to collaboration quality. Collaboration technology seems to be stuck in just overcoming the limitation of people not being in the same place at the same time. Real time communications are supported through such things as web-conferencing and instant messaging, while email, wikis, and web-based repositories provide the electronic equivalent of the shared file cabinet. Although some technologies support workflow and project management to a degree, there is little support for the joint development lifecycle of planning, creating, evaluating, negotiating, and consolidating group work. Focusing broadly on collaboration challenges highlights limitations of current technology and can help provide direction for the kinds of information technology that will be needed to bridge the IT support gap to meet current and future collaboration challenges.     

基于云计算平台的移动IPTV系统设计及负载均衡技术研究

对现有的云计算平台进行分析和总结,结合移动IPTV的特点,基于Eucalyptus开源云计算平台,提出并设计了一个应用于移动IPTV场景的云计算系统,并对其负载均衡技术予以改进。实验仿真结果表明改进后系统比原有系统的调度算法有明显优势,并更加适合云计算平台,并适合移动IPTV服务的发展。     

Grand Challenges and Scientific Standards in Interval Analysis

This paper contains a list of grand challenge problems in interval analysis, together with some remarks on improved interaction with mainstream mathematics and on raising scientific standards in interval analysis.     

支持VoIP电话紧急呼叫的QoS保障方案及其仿真

紧急呼叫在Internet上是一个非常重要的任务,在有限带宽情况下尽可能多地接受VoIP呼叫是必要的;但同时为紧急呼叫提供高质量的服务也是必须的。本文基于一种保证端到端的VoIPQoS服务模型,提出了新的方案。该方案基于DiffservAF服务模型、SIP信息段和一种通过观察VoIP数据流信息而设计的呼叫接纳信令,来为紧急VoIP提供高质量服务。最后,根据网络仿真结果性能指标,验证提出方案的合理性、可靠性。