Real-time air pollution monitoring with sensors on city bus

This paper presents an experimental study on real-time air pollution monitoring using wireless sensors on public transport vehicles. The study is part of the GreenIoT project in Sweden, which utilizes Internet-of-Things to measure air pollution level in the city center of Uppsala. Through deploying low-cost wireless sensors, it is possible to obtain more fine-grained and real-time air pollution levels at different locations. The sensors on public transport vehicles complement the readings from stationary sensors and the only ground level monitoring station in Uppsala. The paper describes the deployment of wireless sensors on Uppsala buses and the integration of the mobile sensor network with the GreenIoT testbed. Extensive experiments have been conducted to evaluate the communication quality and data quality of the system.     

Data security in unattended wireless sensor networks with mobile sinks

Unattended wireless sensor networks operating in hostile environments face the risk of compromise. Given the unattended nature, sensors must safeguard their sensed data of high value temporarily. However, saving data inside a network creates security problems due to the lack of tamper‐resistance of sensors and the unattended nature of the network. In some occasions, a network controller may periodically dispatch mobile sinks to collect data. If a mobile sink is given too many privileges, it will become very attractive for attack. Thus, the privilege of mobile sinks should be restricted. Additionally, secret keys should be used to achieve data confidentiality, integrity, and authentication between communicating parties. To address these security issues, we present mAKPS, an asymmetric key predistribution scheme with mobile sinks, to facilitate the key distribution and privilege restriction of mobile sinks, and schemes for sensors to protect their collected data in unattended wireless sensor networks. Copyright © 2011 John Wiley & Sons, Ltd.     

基于无线传感器网络的海洋环境监测系统研究

无线传感器网络在海洋环境中最重要的应用是海洋环境的实时监控系统。与其他监测系统相比,海洋实时监测系统具有实时传感器节点,独立性高,精度高的特点。为了提高传感器的监测能力和稳定性,针对海洋环境管理的需求,提出并研究了基于无线传感器网络的海洋环境监测系统,并采用了将ZigBee通信与GPRS和GPRS相结合的技术方法。卫星通信,可以有效地监测海洋污染状况,为海洋环境监测提供一种新的方法和技术,对于后期应用具有重要的参考价值。     

Design and implementation of a wireless sensor network architecture using smart mobile devices

Wireless sensor networks improve the quality of human daily life like ubiquitous city and healthcare services as well as the fundamental monitoring such as environment pollution, tunnel monitoring, earthquake diagnostic, and so on. To increase usability and feasibility of collected sensor data, a wireless sensor network should be required to apply a variety of mobile devices to give the information at anytime and anywhere to users. Thus, we present multi-sensor centric smart sensor network architecture using general mobile devices in order to provide more efficient and valuable sensor network application and services. The proposed system architecture is based on IEEE 802.15.4-2006 standard with smart mobile devices. We also show some scenarios with on-demand request and real time event driven data to show the feasibility of the proposed architecture using five kinds of sensors such as magnetic, photodiode, microphone, motion and vibration. Based on the experiment results, we show that the proposed system has the potential as smart mobile device-based wireless sensor network architecture.     

Design and Implementation of a Network‐Adaptive Mechanism for HTTP Video Streaming

This paper proposes a network‐adaptive mechanism for HTTP‐based video streaming over wireless/mobile networks. To provide adaptive video streaming over wireless/mobile networks, the proposed mechanism consists of a throughput estimation scheme in the time‐variant wireless network environment and a video rate selection algorithm used to increase the streaming quality. The adaptive video streaming system with proposed modules is implemented using an open source multimedia framework and is validated over emulated wireless/mobile networks. The emulator helps to model and emulate network conditions based on data collected from actual experiments. The experiment results show that the proposed mechanism provides higher video quality than the existing system provides and a rate of video streaming almost void of freezing.     

Image transmission over mobile Bluetooth networks with enhanced data rate packets and chaotic interleaving

Bluetooth is a wireless personal area network. This type of networks is widely used for image communication. This paper presents a study for the transmission of images over mobile Bluetooth networks. It presents a novel chaotic interleaving scheme for this purpose. In this scheme, the chaotic Baker map is used for bit interleaving and enhanced data rate packets are used for data transmission. In the proposed scheme, the chaotic interleaver can be applied on the whole bit stream or on a packet-by-packet basis. The proposed scheme is applied with 2DH₁, 2DM₁, 3DH₅, and 3DM₅ packets. A comparison study between the proposed scheme and the traditional interleaving schemes for image transmission over correlated and uncorrelated fading channels is presented. The simulation results show the superiority of the proposed scheme over the traditional schemes. The proposed scheme also adds a degree of security to data transmission.     

Pervasive, secure access to a hierarchical sensor-based healthcare monitoring architecture in wireless heterogeneous networks

This study presents a healthcare monitoring architecture coupled with wearable sensor systems and an environmental sensor network for monitoring elderly or chronic patients in their residence. The wearable sensor system, built into a fabric belt, consists of various medical sensors that collect a timely set of physiological health indicators transmitted via low energy wireless communication to mobile computing devices. Three application scenarios are implemented using the proposed network architecture. The group-based data collection and data transmission using the ad hoc mode promote outpatient healthcare services for only one medical staff member assigned to a set of patients. Adaptive security issues for data transmission are performed based on different wireless capabilities. This study also presents a monitoring application prototype for capturing sensor data from wireless sensor nodes. The implemented schemes were verified as performing efficiently and rapidly in the proposed network architecture.     

基于环境信息监测的无线传感器网络节点设计

针对海岸、海洋环境远程实时监测的需求,设计了由超低功耗MCU芯片MSP430F1611、无线收发器芯片CC2420及各种传感器接入电路构成的具有多种环境参数采集功能的无线传感器网络节点.该节点系统利用所搭载的各种传感器采集环境中的温度、湿度、光照强度等数据,通过相邻节点间的无线通信,以多跳传输的方式,将测量数据上传给上...     

基于GIS的移动通信网络质量监控与分析系统研究

移动通信网的业务分布具有较强的地理空间特征,而无线信号的地理空间覆盖质量又涉及移动网络的基础质量,涉及无线网络优化的大部分数据分析必须结合地理环境来进行才有意义.本文重点讨论了基于GIS的移动通信网络质量监控与分析系统的开发架构思路,最后论述了系统的开发环境,并实现了GSM网络的移动通信网络质量监控与分析系统.     

基于无线传感网络的智能机房环境监控系统的设计与实现

针对传统人工采集费时费力和有线监控布线复杂、维护困难的局限性,将传感器与ZigBee无线网络技术相结合,提出了无线传感网络的智能机房环境监控系统的设计方案,并进行了实现。该系统利用ZigBee技术实现对采集数据及信息的无线收发,通过公共网关接口CGI将数据和控制信息传送到互联网,操作人员从远距离的PC机上实时查看数据、实施控制,从而实现了真正意义的远程监控。     

基于WSN的环境质量监测系统设计与实现

提出、设计并验证了一种低成本、低功耗的分布式环境质量无线实时监测系统。该系统采用基于TI CC2530微控制器的ZigBee无线协议栈。无线采集节点内置的MSP430G2553微控制器收集温湿度传感器、空气微粒传感器和光传感器得到的环境质量数据经由ZigBee无线传感网传送至ZigBee-IP网关。基于S3C2440的嵌入式ZigBee-IP网关将采集到的环境质量数据以Web网页的形式向互联网用户提供实时环境质量报告。该系统针对目前百姓普遍关心的环境质量问题,对于政府环保部门、大型污染企业环境质量监控等有一定的参考及推广价值。     

一种适合高速铁路的宽带无线接入网络架构

快速发展的高速铁路是需要覆盖移动语音和数据业务的新热点场景,这使得高速铁路宽带无线接入系统成为研究重点。根据高速铁路的特定环境,本文提出了一种基于光载无线通信技术的新型高速铁路宽带无线接入网络架构,阐述了相对应的媒体接入控制方案,并对其移动性管理进行了说明。     

Bio-inspired Patrolling Scheme Design in Wireless and Mobile Sensor and Robot Networks

Environment monitoring is an essential application in wireless sensor networks. We consider a large area surveillance in which a monitored region is divided into small sub areas where sensors, sinks, and mobile robots are responsible for surveillance jobs. Sensors collect data from the environment for specific monitoring purposes. Sinks are usually stationary and responsible for collecting regional information, while mobile robots are always patrolling the monitored areas to handle events. Under the above scenario, we propose anti-inspired digital pheromone to classify priorities of events used in a proposed patrolling algorithm, in which, mobile robots are patrolling and handling events with priorities along the roads. Events with higher priorities are handled with higher priorities, while productive event handling, i.e., handling more events, is also the goal. Extensive simulations are conducted to study the efficiency of the proposed method.

     

电能质量监测系统中无线传感器网络的设计

从杆架式变压器收集的电压、电流和温度测量值通过蜂窝移动技术传送到远程监控.由于蜂窝移动技术的高成本,电能质量监测过程中受到诸多限制且数据采集间隔较长.为了缓解这些问题,文中提出了一种有线中继子系统和无线采集子系统组合的通信基础设施,变电站和监控中心之间进行有线连接,杆架式变压器和变电站之间进行无线连接,实现了成本降低并...     

Increasing lifetime of wireless sensor networks using controllable mobile cluster heads

In a static wireless sensor network (WSN), sensors close to the base station (BS) run out of energy at a much faster rate than sensors in other parts of the network. This is because the sensor close to the BS always relays the data for other sensors, resulting in an unequal distribution of network residual energy. In this paper, we propose a scheme for enhancing the network lifetime using multiple mobile cluster heads (CHs) that can move in the WSN in a controllable manner. The CH controllably moves toward the energy‐rich sensors or the event area, offering the benefits of maintaining the remaining energy more evenly, or eliminating multihop transmission. Therefore, the proposed scheme increases the network lifetime. We theoretically analyze the energy consumption in our scheme and propose three heuristical mobility strategies. We further study the collaboration among CHs in order to maintain their connectivity to the BS to ensure the delay requirement for real‐time applications. Simulation shows that network lifetime is increased by upto 75% over existing approach by making CHs always move toward a stable equilibrium point. Our connectivity algorithm provides a best case improvement of 40% in transmission delays over existing schemes. Copyright © 2009 John Wiley & Sons, Ltd.     

A network selection scheme for multicast applications in wireless network convergence

In wireless network convergence, each mobile host is expected to have multiple kinds of wireless interfaces. Multicast‐based applications are expected to be widely deployed. In this paper, a new network selection scheme is proposed for a mobile host to select the most appropriate wireless access network to maximize user satisfaction and ISP's profit, simultaneously. We have devised a metric to measure a user's satisfaction and we also developed a ‘normalized network resource’ metric for system profit measure. We have compared our scheme with three other reference schemes, through simulations. Depending on the network deployment situations, our scheme exhibits one‐fifth service disruption time of other reference schemes, while the resource consumption of our scheme is comparable to that of the minimum resource scheme. Overall, the gain of our scheme becomes higher as users move faster and/or the population density increases. Copyright © 2010 John Wiley & Sons, Ltd.     

无线传感器网络的新进展与应用

为完成实时监测、感知和采集各种监测环境或对象的信息,将智能传感器组成分布式信息测控网络。无线传感器网络是传感器智能化发展的趋势。它是以数据获取与数据管理为核心的全新网络,综合了传感器技术、嵌入式计算技术、分布式信息处理技术和无线通信技术。介绍了无线传感器网络节点、无线传感器网络、无线传感器网络的最新进展,并给出了无线传感器网络的应用。     

基于无线传感网络的手机实时医疗监护系统简

针对通过住院观察病人的心电图来对心血管疾病进行诊断的方法的不足,文中采用无线传感网络作为监控系统的信息采集平台,将其应用于人体健康监控领域,设计并实现了一款基于无线传感网络的手机实时医疗监护系统。系统通过无线传感网络来对患者的心电数据进行集中式管理．并可通过医生工作站来实现对患者的远程病情诊断。与目前现有的远程医疗监护系统相比,基于无线佳感网络的手机实时医疗监护系统具有精确度高、实时性好、能耗低、部署方便、设备廉价等一系列优势。     

DTN Based Dominating Set Routing for MANET in Heterogeneous Wireless Networking

In mobile communications, effective inter-networking is mandatory in order to support user roaming among various types of wireless networks while maintaining connectivity. In this paper, we propose a super node system architecture to achieve the connectivity over interconnected heterogeneous wireless access networks, which employs the delay-tolerant network (DTN) concept to overcome the problem of potential intermittent connections caused by user roaming and ensures message delivery in the presence of a long disconnection period. By introducing the concept of virtual network topology, we present a new routing technique for mobile ad hoc networks (MANETs) within the system architecture, which redefines the dominating-set based routing for the challenged network environment. A time based methodology is presented to predict the probability of future contacts between node pairs for constructing the virtual network topology. Simulation results demonstrate the effectiveness of the proposed dominating-set based routing scheme under the DTN system architecture.