低功耗无线传感器网络节点的设计

文章分析了传感器节点的能耗,介绍了一种采用MSP430F149处理器和无线收发模块设计的低功耗无线传感器网络节点,阐述了该节点的组成、节点处理控制单元、无线通信单元和传感探测单元的设计及节点软件的设计等。     

基于MCAPI的多核软件开发方法

提出了一种基于多核通信应用程序接口(MCAPI)标准的多核软件开发方法,该标准提供了基于消息传递的API,适用于核间通信,大大提高了应用程序在多核处理器上的可移植性。采用poly-platform软件工具进行多核软件开发,首先建立拓扑结构,然后定义节点工程,完成存储分配等工作,再利用MCAPI模板完成节点间通信,最后编制各个节点的应用程序。该软件开发流程独立于厂商、器件和操作系统,可将应用程序快速灵活地映射到不同的同构和异构多核架构上,大大提高了多核软件的开发效率。     

基于Lon Works技术的智能化电量计量系统

LonWorks网络是美国Echelon开发的一种新型现场总线控制网络。文章提出了采用该现场总线网络实现工厂电表电量自动计量的一般方法 ,智能节点的硬件、软件及PC机监测软件等的具体实施方案。     

基于LPC1100的温度检测网络节点设计

基于NXP公司LPC1100系列处理器设计了一种温度检测网络节点。介绍了网络系统的整个设计方案和温度检测网络节点的硬件设计,并给出功耗管理、温度传感器和ZigBee三个软件模块的具体软件设计方法。     

基于L0nW0rks技术的智能化电量计量系统

LonWorks网络是美国Echelon开发的一种新型现场总线控制网络。文章提出了采用该现场总线网络实现工厂电表电量自动计量的一般方法,智能节点的硬件、软件及PC机监测软件等的具体实施方案。     

基于LONWORKS网络的多处理器智能节点设计

在基于ＬＯＮＷＯＲＫＳ网络的现场总线中,Ｎｅｕｒｏｎ芯片是节点的核心,但是其处理能力不足以胜任复杂的计算任务．为增强节点的计算能力,提出并实现了一种非对称多处理器（ＡＭＰ）结构的控制节点设计方案,多个处理器之间采用享总线相连,Ｎｅｕｒｏｎ芯片为主处理器,３个从处理器并行完成信号的高速采样计算．在具体实现中,提出了单缓冲、双通道总线、两级树状网络、通信线程细化等技术手段．按该设计方案实现的总线计轴器     

列车网络通用智能检测与控制节点单元研究

针对目前列车网络检测与控制节点封闭、专用这一现状，在分析列车网络检测与控制节点功能及性能需求的基础上，采用国际标准及运用模块化方法研究了节点硬件设计，采用应用业务分析与适配及软件闭环反馈检测与控制方法进行了节点的软件设计，从而实现了列车网络节点检测与控制的通用性、智能化和单元化。此研究成果不仅可以节约列车网络的开发成本，而且极大地减少列车网络的开发时间及开发难度。实验结果验证了所研究成果的正确性。     

电气设备温度监测的无线传感器网络节点设计

提出了一种可用于对封闭式开关柜内的电气设备进行测温的无线传感嚣网络( WSNs)节点的设计方案.用可编程片上系统(PSoC)作为处理器模块的处理器,运用于WSNs节点的设计之中,使WSNs节点降低功耗,缩小体积,提高可靠性,降低成本,增加生存周期,缩短开发周期.详细阐述了节点系统的硬件和软件实现,并给出了实验结果,其实...     

基于ARM9的无线传感器网络网关节点设计

设计并实现了一种基于 ARM9处理器的无线传感器网络嵌入式网关,用来完成 Zigbee 和GPRS 之间数据的透明转换。节点以 ARM9嵌入式处理器 S3C2410为核心,ARM Linux 为实时操作系统,并结合 Zigbee 模块 JN5139和 GPRS 模块 MC55实现采集数据的节点汇聚和远程转发,给出了网关节点的硬件组成结构和软件实现流程。     

中间件在无线传感器网络节点设计中的应用

在无线传感器网络(W SNs)节点设计和应用软件开发中引入中间件技术,提出了一种基于中间件的W SNs节点软件、硬件体系结构。一定程度上简化了异构的传感器网络的应用开发,并使得不同应用实例之间实现跨网络的协同工作。     

基于主机LON节点的研究与开发

目前大多数LON节点只具有单一的神经元处理器,其控制能力不高。针对这一现状,该文论述了利用单片机AT89S51设计开发基于主机LON节点的硬件部分和软件部分。在硬件方面介绍了采用ADC0809模数转换芯片的数据采集系统、AT89S51和MC143150的接口及MC143150和物理网络的接口;在软件方面介绍了数据采集、并行Slave A模式的通信和利用网络变量发送信息三方面的程序设计。     

基于LonWorks技术双处理器结构的模拟量输出节点AO研究

目前大多数Lon节点只具有单一的神经元处理器,其控制能力不高.针对这一现状,利用LonWorks技术原理介绍了基于神经元芯片MC143150和单片机AT89S51双处理器结构模拟量输出节点AO的测控单元设计,通讯单元设计,两处理器接口设计,软件编程以及节点的抗干扰措施、节点性能的优化方法.     

A Scalable Distributed Shared Memory Architecture

Scalability of a multiprocessor architecture depends on its ability to manage interconnection network latency with increasing number of processors. Interconnection network latency can be minimized by reducing the distance traversed by a message in terms of number of nodes and wire lengths. Scalability of a DSM architecture also depends on the scalability of the coherency protocol and the associated directory storage requirements. In this paper we describe a DSM architecture based on a fat tree interconnection network with augmented switching nodes. The proposed architecture is CC-NUMA, but supports several important features of COMA architectures. The scalability of this architecture is enhanced by integrating routing and cache coherency operations, which helps in improving locality by trapping requests locally. Scalability of a DSM architecture is defined and evaluated in terms of the asymptotic speedup of an algorithm with increasing number of processors.     

基于网络处理器的MPLS VPN协议的研究与实现

MPLS VPN是下一代互联网的主流安全协议之一,本文针对如何在基于网络处理器的高性能路由器中高效实现MPLS VPN协议开展研究.本文在路由器标准功能的软件基础上进行扩 展,提出了基于网络处理器的MPLS VPN协议实现软件结构;利用网络处理器灵活可编程性与高性能的优点,对其关键技术进行了设计与实现;充分发挥了网络处理器在快速协议扩展方面的优势,同时也对网络处理器软件升级的方法进行了有益探索.     

A massively parallel fault-tolerant architecture for time-critical computing

Building large-scale parallel computer systems for time-critical applications is a challenging task since the designers of such systems need to consider a number of related factors such as proper support for fault tolerance, efficient task allocation and reallocation strategies, and scalability. In this paper we propose a massively parallel fault-tolerant architecture using hundreds or thousands of processors for critical applications with timing constraints. The proposed architecture is based on an interconnection network called thebisectional network. A bisectional network is isomorphic to a hypercube in that a binary hypercube network can be easily extended as a bisectional network by adding additional links. These additional links add to the network some rich topological properties such as node symmetry, small diameter, small internode distance, and partitionability. The important property of partitioning is exploited to propose a redundant task allocation and a task redistribution strategy under realtime constraints. The system is partitioned into symmetric regions (spheres) such that each sphere has a central control point. The central points, calledfault control points (FCPs), are distributed throughout the entire system in an optimal fashion and provide two-level task redundancy and efficiently redistribute the loads of failed nodes. FCPs are assigned to the processing nodes such that each node is assigned two types of FCPs for storing two redundant copies of every task present at the node. Similarly, the number of nodes assigned to each FCP is the same. For a failure-repair system environment the performance of the proposed system has been evaluated and compared with a hypercube-based system. Simulation results indicate that the proposed system can yield improved performance in the presence of a high number of node failures.     

一种低功耗无线传感器网络节点设计

无线传感网络节点功耗直接决定了无线网络的生存周期,为了降低节点能耗,在对多种微处理器芯片和射频芯片性能分析比较的基础上,选择了MSP430F2618处理器芯片和射频芯片CC2520射频芯片,采用微处理器与无线模块独立架构,设计了一种性能灵活无线网络节点;提出了微处理器、射频芯片在工作模式与多种低功耗模式之间切换,以及微处理器时钟的控制等节能策略,在此基础上设计了网络路由节点和端节点软件系统;实验证明:在发射功率为0 dBm,数据传输速率为1 MHz时,设计的节点运行电流和休眠电流(26.1 mA,1.57μA)与传统的Imote节点(35.1 mA,3.6μA)、Mica2节点(56.2 mA,21μA)相比,明显低于传统节点;当节点电池容量为2*700 mAh,工作周期为10分钟时,其生存周期为7.2个月;设计的节点的寿命达到预期目标。     

The M-machine multicomputer

The M-Machine is an experimental multicomputer being developed to test architectural concepts motivated by the constraints of modern semiconductor technology and the demands of programming systems. The M-Machine computing nodes are connected with a 3-D mesh network; each node is a multithreaded processor incorporating 9 function units, on-chip cache, and local memory. The multiple function units are used to exploit both instruction-level and thread-level parallelism. A user accessible message passing system yields fast communication and synchronization between nodes. Rapid access to remote memory is provided transparently to the user with a combination of hardware and software mechanisms. This paper presents the architecture of the M-Machine and describes how its mechanisms attempt to maximize both single thread performance and overall system throughput. The architecture is complete and the MAP chip, which will serve as the M-Machine processing node, is currently being implemented.     

无线传感器网络信息时空融合模型与算法研究

信息融合是解决无线传感器网络能量和通信带宽受限的有效途径,提出了一种无线传感器网络信息时间和空间多级混合融合的结构模型。首先对距离汇聚节点较远的节点信息进行时间融合和对距离汇聚节点较近的节点信息在汇聚节点进行时空融合,然后在汇聚节点对两种节点的融合结果进行全网络的空间融合。就该模型提出了基于DS证据理论的多级时空融合算法。数据分析结果表明:该模型能够降低节点能耗,延长网络寿命。     

基于CAN总线的可重构SHM系统设计

针对结构健康监测(SHM)系统现场节点功能固化,不便于机动配置及后期维护等问题,提出一种基于CAN总线的可重构SHM系统架构,设计节点功能重构、网络结构重构以及资源分配重构等技术。以功能适配接口及嵌入式操作系统的软硬件协同实现节点功能重构,以自组织特征映射网实现网络结构重构的优先级聚类,以基于组件对象模型的上位监控软件实现资源的按需分配。利用该方法设计的系统具有灵活、高效和一定自主性等特点。     

Real-time control architecture using Xenomai for intelligent service robots in USN environments

This paper describes the implementation of a dual-kernel software architecture, based on standard Linux and real-time embedded Linux, for real-time control of service robots in ubiquitous sensor network environments. Mobile robots are used in active service for the assisted living of elderly people, monitoring their mental and physiological data with wireless sensor nodes. The data collected from sensor nodes are routed back to a sink node through multi-hop communication. The moving sink node installed on the main controller of the robot collects data and transmits it to the main controller. To be able to handle emergency situations, the robot needs to satisfy real-time requirements when processing the data collected, and invoking tasks to execute. This paper realizes a multi-hop sensor network and proposes real-time software architecture based on Xenomai. The real-time tasks were implemented, with priority, to rapidly respond to urgent sensor data. In order to validate the deterministic response of the proposed system, the performance measurements for the delay in handling the sensed data transmission and the trajectory control with a feedback loop were evaluated on the non real-time standard Linux.