共查询到20条相似文献，搜索用时 593 毫秒
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本文在分析SDH同步网技术和同步时钟控制方式的基础上,提出SDH同步网中光电转换模块的硬件系统的设计方案,从逻辑上进行了模块划分并确定了各个模块要实现的功能,详细介绍了关键芯片选取的型号和特征,重点分析了CPU和控制电路的具体实现方案,对其它相关模块的硬件实现也有论述. 相似文献
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This paper presents an efficient VLSI architecture of the contest-based adaptive variable length code (CAVLC) decoder with power optimized for the H.264/advanced video coding (AVC) standard. In the proposed design, according to the regularity of the codewords, the first one detector is used to solve the low efficiency and high power dissipation problem within the traditional method of table-searching. Considering the relevance of the data used in the process of runbefore’s decoding, arithmetic operation is combined with finite state machine (FSM), which achieves higher decoding efficiency. According to the CAVLC decoding flow, clock gating is employed in the module level and the register level respectively, which reduces 43% of the overall dynamic power dissipation. The proposed design can decode every syntax element in one clock cycle. When the proposed design is synthesized at the clock constraint of 100 MHz, the synthesis result shows that the design costs 11 300 gates under a 0.25 μm CMOS technology, which meets the demand of real time decoding in the H.264/AVC standard. 相似文献
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方菁 《武汉职业技术学院学报》2010,9(1):75-78
根据电力系统地理分布地域广以及对时钟同步要求精度高的原则,提出了一种GPS授时模块和IEEE1588协议相结合的时钟同步方案,该方案按地理因素将整个电力网络划分为若干个子网络,各个网络之间利用GPS接收模块实现时钟的同步,子网络内部采用IEEEl588协议实现时钟的同步,从而实现整电力网络的时钟同步;然后在FPGA平台上对精确时钟模块、GPS信息接收及处理模块、IEEE1588协议的部分实现模块进行实现;最后通过系统误差验证表明本文所提出的方案切实可行。 相似文献
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为了对各养殖场内的温湿度信号进行自动化采集、传输、存储和显示,提供全天候、无人看守、免维护的无线监控服务,基于ZigBee技术,采用CC2430射频芯片和温湿度传感器SHT11搭建了养殖场监测网络。文章主要探讨了无线传感网络的协调器主节点、各传感器节点的结构设计及程序流程,给出了上位机的软件设计。研究表明,采用SHT11高精度、高集成度的温湿度数字传感器以及CC2430芯片作为节点的主处理和射频模块,并利用节点的休眠功能可降低系统功耗,其无论在投入成本和数据检测精度上都基本符合设计要求。 相似文献
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INTRODUCTION Networked Control System (NCS) is composed of a central controller and a remote system containing a physical plant, sensors and actuators (Halevi and Ray, 1988; Nilsson, 1998; Walsh et al., 1999a; 1999b; Branicky et al., 2000). The controller and the plant are located at different spatial locations and directly connected through network to form a closed loop control. Fig.1 shows the NCS configuration and the time delay induced by network, where u is the control signal an… 相似文献
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This paper proposes an analysis and a direct power control （DPC） design of a wind turbine driven doubly-fed induction generator （DFIG） under unbalanced network voltage conditions. A DFIG model described in the positive and negative synchronous reference frames is presented. Variations of the stator output active and reactive powers are fully deduced in the presence of negative sequence supply voltage and rotor flux. An enhanced DPC scheme is proposed to eliminate stator active power oscillation during network unbalance. The proposed control scheme removes rotor current regulators and the decomposition processing of positive and negative sequence rotor currents. Simulation results using PSCAD/EMTDC are presented on a 2-MW DFIG wind power generation system to validate the feasibility of the proposed control scheme under balanced and unbalanced network conditions. 相似文献
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针对发电厂电能电量日常管理工作,提出基于Delphi开发发电厂电能量采集管理系统的软件设计方案,给出一种利用B／S结构的软件设计方案．实际运行结果表明,此方案具有运行稳定、查询速度较快及使用方便等优点． 相似文献
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唐山医保网络设计方案浅析 总被引：2，自引：0，他引：2
对唐山医疗保险网络的拓扑结构、速率规划、网络类型、主干网设计、网络安全等进行了多方案比较论证，确定了以路由器为中心的光纤主干网和以交换机为中心的子网方案，对类似城市医疗保险网络的建设有着借鉴意义。 相似文献
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探讨了当前高校实验室开放管理过程中存在的安全隐患。分析了智能化实验室管理系统的组成结构和特点。利用研制的实验室智能管理系统,与预约、门禁刷卡连用进行身份识别,通过网络电源控制器对有源仪器设备实行电源分配和运行监管,并使用高清晰视频监控系统对实验过程进行监控,在技术上有效克服了实验室开放存在的安全隐患,为实现实验室向学生全天候开放提供了安全保障。 相似文献
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以奶粉干法生产过程为例,提出了采用IC卡和PLC的粉仓车配送控制系统方案。主PLC通过PROFIBUS网络通讯与各子PLC通讯,IC卡读卡器与子PLC的自由口连接,利用STEP7编程软件对PLC与读卡器进行程序设计,实现粉仓车上的IC卡识别与纠错控制,并利用上位机对其进行远程监控,减小奶粉干混配送过程出错的可能性,提高食品加工过程的安全性。结果表明,该系统可提高生产效率,降低工人的劳动强度,为奶粉等食品类工业生产的厂内干粉配送控制系统的进一步研究提供了实践基础。 相似文献
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校园网英语教学资源库建设方案的构建及其评估体系探索 总被引：1，自引：0，他引：1
张琴 《连云港职业技术学院学报》2005,18(1):61-63
通过对校园网教学资源库现状方面的研究，构建校园网英语教学资源库建设方案和评价体系，该方案将涉及校园网英语教学资源库的模式、内容等方面，将对网络英语教学实践具有清晰而具体的指导作用。 相似文献
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针对我国用电管理和用电量抄收的现状和存在的问题,提出了网络多路型智能电度表系统的设想,介绍了多路型智能电度表系统的结构方案和实现控制的途径,并讨论了用电量的数据采集和计量方式。 相似文献
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近几年来，随着科学技术的进步和时代的发展，人们对时间精度提出了越来越高的要求，特别是在国防、科研及电力、铁道、交通、航海等方面，所以，研制高精度时钟系统已越来越重要。现用Motorola公司的GT-on-core GPS接收模块来制作高精度时钟系统。 相似文献
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网络课程教学设计是网络教育成功的首要因素,基于网络教学评价策略的网络教学设计,是保证通过网络实施高职《计算机组网与管理》学习领域课程成功的重要组成部分。依据网络教学设计的理论依据,提出工作过程导向的高职网络教学设计的思路和方案,在实施过程中运用网络教学评价策略为高职开展基于网络的课程教学提供个案经验。 相似文献
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对高等院校校园网建设的思考 总被引：2，自引：0，他引：2
围绕高等院校校园网建设,从基本要素入手,提出校园网建设要求与选择原则,用软件工程的思想来规划和设计校园网,详细阐明了校园网总体实施方法,并提出校园网的建设实施中需注意的问题. 相似文献
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An improved linear-time retiming algorithm is proposed to incrementally optimize the clock period,especially considering the influence of the in-out degree of the critical combinational elements.Firstly,the critical elements are selected from all the critical combinational elements to retime.Secondly,for the nodes that cannot be performed with such retiming,register sharing is implemented while the path delay is kept unchanged.The incremental algorithm can be applied with the technology mapping to minimize the critical path delay and obtain fewer registers in the retimed circuit with the near-optimal clock period.Compared with Singh’s incremental algorithm,experiments show that the proposed algorithm can reduce the flip-flop count by 11% and look-up table(LUT) count by 5% while improving the minimum clock period by 6%.The runtime is also reduced by 9% of the design flow. 相似文献
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本钢物资计量网络系统的设计 总被引：1，自引：0，他引：1
在大型冶金企业中物资计量是企业计量管理的重要内容.本钢在全面的ERP战略中提出了对计量信息网络的升级改造要求,据此规划了面向公司内外的整体化、网络化的计量信息系统,并首先实施了物资计量网络系统.主要包括本钢计量信息网的总体规划与设计,物资计量网络系统的功能设计、业务处理流程设计和以称量为中心的数据流设计. 相似文献
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A high speed column-parallel CDS/ADC circuit with nonlinearity compensation is proposed in this paper.The correlated double sampling (CDS) and analog-to-digital converter (ADC) functions are integrated in a threephase column-parallel circuit based on two floating gate inverters and switched-capacitor network.The conversion rate of traditional single-slope ADC is speeded up by dividing quantization to coarse step and fine step.A storage capacitor is used to store the result of coarse step and locate the section of ramp signal of fine step,which can reduce the clock step from 2 n to 2 (n/2+1).The floating gate inverters are implemented to reduce the power consumption.Its induced nonlinear offset is cancelled by introducing a compensation module to the input of inverter,which can equalize the coupling path in three phases of the proposed circuit.This circuit is designed and simulated for CMOS image sensor with 640×480 pixel array using Chartered 0.18μm process.Simulation results indicate that the resolution can reach 10-bit and the maximum frame rate can reach 200 frames/s with a main clock of 10MHz.The power consumption of this circuit is less than 36.5μW with a 3.3V power supply.The proposed CDS/ADC circuit is suitable for high resolution and high speed image sensors. 相似文献