基于情境感知和终端适配的个性化信息推送模型构建

提出了基于情境感知和终端适配的个性化信息推送系统模型.基于无线传感器网络技术,搭建用户情境感知模型,实时获取用户情境信息.基于RFID技术,实现终端设备信息的自动获取,并建立终端设备信息库及其关联机制,从而推送与终端适配的个性化信息.该研究将为个性化信息推送提供一种新的方法.     

基于uSD卡的移动情境数据采集和汇报系统的设计与实现*

提出了一种基于uSD卡的移动情境数据采集和汇报系统。移动设备利用uSD卡与外部传感器节点通信,并将来自于内部和外部的情境数据汇报给远程数据库。提出了一种集中式的情境数据采集汇报调度算法,通过移动设备之间的协作来去除不同移动设备所汇报情境数据间的冗余,并提高情境数据采集的精度。定义了基于XML的传感器数据包描述语言,以克服外部传感器数据包的异构性。设计并实现了连接管理模块,支持在多种通信方式之间的透明动态切换。基于提出的情境数据收集和共享系统设计并实现了混合现实的PacMan游戏,游戏的试运行结果表明,本系统具有较好的实时性和可用性。     

基于Tiny OS2.0和Android4.2的可燃气监测系统

为了有效地减少由可燃气泄漏导致的损失和加强对可燃气使用的安全监测,提出了一种基于无线传感网络的可燃气监测系统;该系统主要由可燃气体无线监测节点和移动监控终端构成,其中无线监测节点是以8位超低功耗微处理芯片ATmega1281、2.4GHz射频芯片AT86RF230和通用可燃气体传感器MQ-2为核心器件,基于tinyos2.0平台利用nesC语言设计完成节点感知程序;移动监控终端选用ARM处理器S5PV210,并基于安卓4.2平台设计实现实时报警、移动监控、动态显示等功能;试验结果表明,该系统具有布设简单、测量精度高、功耗低等优点,误警率不超过0.5%并可持续工作180天。     

基于物联网的精准农业信息感知系统设计

为精准变量播种、施肥、施药及自动灌溉等的实施,并为科学研究提供全面信息,本文设计了精准农业信息感知系统。系统设计基于物联网透彻感知、可靠传输及智能处理理念,整个系统由无线感知网络、传输节点、GPRS及上位机管理系统等部分组成。其中无线感知网络由感知终端和传感模块组成,并通过标准接口进行连接。系统能实时感知作物生长环境信息及作物生理信息,并将数据可靠传输到上位机管理系统。上位机管理系统首先对数据进行处理,并将数据写入数据库,还可通过Web系统在线展示和发布。长时间运行测试表明,系统性能稳定可靠。     

基于ZigBee的多传感器物联网无线监测系统设计

设计一款基于zigbee的多传感器物联网无线监测系统,阐述该系统的主要功能,并对其总体结构、硬件电路以及软件设计进行详细论述。系统基于ZigBee技术组建树形无线传感器网络,以CC2530为核心设计模块化无线终端节点,集成了温度、湿度、烟雾、红外等的多传感器模块,组建无线监测系统。通过协调器节点无线采集数据,并利用GPRS模块远程传输数据,可实现环境信息、人流量、安防等监控。     

无线传感器网络中的数据查询

无线传感器网络以数据为中心,提供数据采集、处理和查询功能.数据查询是无线传感器网络研究中的重点和热点问题.本文从查询过程的角度出发,对目前传感器网络数据查询研究现状进行了系统总结.在此基础之上,考虑传感器网络的异构性,提出了一种基于感知数据之间的数据信息的查询模型,并设计了感知数据交互必须的数据标签,给出了这种数据查询的应用实例.分析表明,该种数据查询能够大大提高传感器网络的查询效率,同时增强网络的健壮性,延长传感器网络使用寿命.     

基于ZigBee的交变湿热箱温湿度采集监控系统设计

针对目前环境试验室温湿度试验的数据采集和监控采用人工记录和设备本身监控方式存在的不足,设计了一种基于ZigBee的交变湿热箱温湿度采集监控系统.该系统以CC2430射频模块组成无线传感网络,由传感器节点把测量的温湿度参数传递至协调器,再由协调器传至移动终端或经串口上传至PC机,PC端用VS2010制作软件实时记录、显示、存储和处理接收的数据,并发出报警信息,移动终端能与PC端同步设置和查询信息.经测试,该系统传感器布置全面、测量精度高、工作稳定、数据传输可靠,移动终端使用灵活、方便,能满足对交变湿热箱温湿度数据的无线采集和监控.     

基于ZigBee无线传感器网络的智能家居系统

随着电子、计算机和通信技术的发展以及人们生活水平的提高,人们对每日息息相关的家居功能有了更高的期望。为了改进现有大多数现场总线式系统布线和维护难的局面,提出了一种基于 ZigBee 无线传感器网络的智能家居系统实现方案。该系统包括ZigBee无线传感器网络、智能家居网关和移动手机终端三个部分,可以通过智能家居网关直观地掌握所有节点上各种传感器的工作状态,集中对各种电器进行控制,并可通过移动手机终端实现远程控制。经测试该系统运行良好,达到了预期的设计目标。     

王平：中国的传感器网络缺乏整体规划

无线传感器网络是大量的静止或移动的传感器以自组织和多跳的方式构成的无线网络,其目的是协作地感知、采集、处理和传输网络覆盖地理区域内感知对象的监测信息,并报告给用户。它的英文是Wireless Sensor Network,简称WSN。在此定义中,传感器网络实现了数据采集、处理和传输的三种功能,     

无线传感器网络分析与仿真

计算机仿真是通信网络研究的有效评估方法之一。无线传感器网络强调对目标现象及其属性的实时感知能力，支持对感知信息的本地处理和节点间协同处理，而传统网络仿真平台并不支持。从网络体系结构和典型应用场景入手，分析无线传感器网络仿真需求，提出结合传统网络通信性能、能耗控制和基础功能实现的网络性能评价指标，并给出基于NS-2的扩展设计和实现。     

Supporting information access in a hospital ward by a context-aware mobile electronic patient record

Context-awareness holds promise for improving the utility of software products. Context-aware mobile systems encompass the ability to automatically discover and react to changes in an environment. Most contemporary context-aware mobile systems aim to support users in private situations, for example, as tourist guides. Thus, we still lack an understanding of the impact of context-awareness in professional work situations. In this paper, we explore context-awareness for mobile electronic patient records through the design of a context-aware mobile prototype called MobileWard. The aim of MobileWard is to support nurses in conducting morning procedures in a hospital ward. MobileWard is context-aware as it is able to discover and react autonomously according to changes in the environment and since it integrates the ability to provide information and services to the user where the relevancy depends on the user’s task. We evaluate MobileWard in two usability evaluations to assess the usefulness of the system and we find that context-awareness holds some promising opportunities, but that it also introduces some potential interaction problems when users are mobile and working in a professional environment. Implications and limitations of the proposed solution are further discussed.     

基于RFID与WSN集成的物联网的供应链监管平台设计

为深化供应链的信息化,设计了通过统一的物联网平台对供应链实施监管.使用IEEE802.15.4标准和ZigBee协议集成WSN和RFID,形成五层网络结构模型,在Intemet上与EPCglobal连接,无缝绑定物品EPC标识和感知环境信息,增强对生产和流通过程的信息获取和处理能力.在软件体系结构中,利用XML提供统一...     

多Agent系统的上下文感知增强

如今,多agent系统(multi-agent system,简称MAS)被广泛用于开发各种应用系统.当前,开放、动态、难控的计算平台要求软件系统能够根据系统自身及其环境状态信息及其改变,动态地调节自身的行为,即具备一定的上下文感知能力.然而,现有工作并未就如何向既有的MAS应用系统引入上下文感知能力提出有效的解决方案.依照关注分离原则,结合面向上下文程序设计技术(context-oriented programming,简称COP)、反射技术(reflection)以及代码植入技术(code instrumentation),提出了一套MAS系统上下文感知增强框架和底层支撑技术.开发人员可以在既有应用源码不可得的情况下,自动地将指定agent类型转换为(扩展为)具有上下文感知能力的agent类型.此外,利用底层运行支撑环境,系统管理员可以在系统运行时刻动态地调整指定agent的上下文感知行为.     

Pervaho: A specialized middleware for mobile context-aware applications

The concept of context-awareness offers a great potential for the future of mobile applications. In order to be developed in an optimal way, mobile context-aware applications need appropriate middleware services. This paper introduces Pervaho, an integrated middleware aimed specifically at supporting the development and testing of mobile context-aware applications. To illustrate the use of Pervaho, we walk through the development of a concrete mobile application and show how it can be built on top of Pervaho’s location-based publish/subscribe service. We also illustrate how a specialized mobility testing tool significantly simplifies the process of testing proximity-based semantics. We then present the implementation of Pervaho, which is based on a set of communication protocols geared at mesh networks. Finally, we provide a performance analysis of our implementation.     

A System Architecture for Context-Aware Service Discovery

Recent technological advances have enabled both the consumption and provision of mobile services (m-services) by small, portable, handheld devices. However, mobile devices still have restricted capabilities with respect to processing, storage space, energy consumption, stable connectivity, bandwidth availability. In order to address these shortcomings, a potential solution is context-awareness (by context we refer to the implicit information related both to the requesting user and service provider that can affect the usefulness of the returned results). Context plays the role of a filtering mechanism, allowing only transmission of relevant data and services back to the device, thus saving bandwidth and reducing processing costs. In this paper, we present an architecture for context-aware service discovery. We describe in detail the system implementation and we present the system evaluation as a tradeoff between a) the increase of the quality of service discovery when context-awareness is taken into account and b) the extra cost/burden imposed by context management.     

Survey on context-awareness in ubiquitous media

Context-awareness assists ubiquitous media applications in discovering the changeable contextual information and adapting their behaviors accordingly. A wide spectrum of context-aware schemes have been proposed over the last decade. However, most of them provide partial functionalities of context-awareness in ubiquitous media applications. They are specified to a certain task and lack of systematic research on context-awareness. To this end, this survey aims at answering how close we are to developing context-aware applications in ubiquitous media in a systematic manner. This survey proposes a reference framework to identify key functionalities of context-awareness. Then, it investigates the state-of-the-art advances in every functionality of context-awareness. Finally, it points out potential directions in context-awareness research and tools for building and measuring context-aware ubiquitous media systems.     

A modular design of Bayesian networks using expert knowledge: Context-aware home service robot

Recently, demand for service robots increases, and, particularly, one for personal service robots, which requires robot intelligence, will be expected to increase more. Accordingly, studies on intelligent robots are spreading all over the world. In this situation, we attempt to realize context-awareness for home robot while previous robot research focused on image processing, control and low-level context recognition. This paper uses probabilistic modeling for service robots to provide users with high-level context-aware services required in home environment, and proposes a systematic modeling approach for modeling a number of Bayesian networks. The proposed approach supplements uncertain sensor input using Bayesian network modeling and enhances the efficiency in modeling and reasoning processes using modular design based on domain knowledge. We verify the proposed method is useful as measuring the performance of context-aware module and conducting subjective test.     

基于ARM和ZigBee的智能家居系统

为了实现家庭设施的智能化控制,提出了一种基于ARM和ZigBee的智能家居系统。该系统通过ZigBee传感器网络采集家居设备信息与传输控制指令,嵌入式系统进行数据的处理与传输,能够实现与CDMA蜂窝网以及Internet互通,用户既可以通过嵌入式控制平台进行家居系统的控制,又可以通过笔记本电脑与手机等移动设备进行控制。通信仿真和嵌入式样机视频传输性能测试表明,该系统完全能够达到家居系统的一般应用要求。     

Programmable context awareness framework

Context-awareness enables applications to provide end-users with a richer experience by enhancing their interactions with contextual information. Several frameworks have already been proposed to simplify the development of context-aware applications. These frameworks are focused on provisioning context data and on providing common semantics, definitions and representations of these context data. They assume that applications share the same semantic, which limits the range of use cases where a framework can be used, as that assumption induces a strong coupling between context management and application logic. This article proposes a framework that decouples context management from application business logic. The aim is to reduce the overhead on applications that run on resource-limited devices while still providing mechanisms to support context-awareness and behavior adaptation. The article presents an innovative approach that involves third-parties in context processing definition by structuring it using atomic functions. These functions can be designed by third-party developers using an XML-based programming language. Its implementation and evaluation demonstrates the benefits, in terms of flexibility, of using proven design patterns from software engineering for developing context-aware application.