基于多信号流图的高层模块描述

多信号流图模型是系统测试性分析的常用模型,为解决其层次化建模分析?的信息保密问题,提出了一种高层模块的描述方法。该方法将故障-测试相关矩阵(D矩阵)扩展,描述了高层模块的故障在系统中的影响、高层模块内部测试对系统测试性的贡献及高层模块对信号传递的影响。该描述方法有效地屏蔽了高层模块的结构信息,有利于不同系统设计者之间的信息保密。实验表明:该描述方法还加快了测试性分析中D矩阵的生成速度,减少了测试性分析时间。     

基于无线Ad Hoc网络的多移动机器人系统

介绍了无线自组织网络及其发展现状和多移动机器人系统。概述了IEEE 802．11DCF协议,并在此基础上阐述Ad Hoc技术用于多移动机器人系统的应用前景,提出了一套实际方案。     

Zn~(2+)、Mn~(7+)对刺参幼参的急性毒性及富集作用研究

在静水条件下,研究了Zn2+、Mn7+两种重金属离子对刺参幼参行为及其存活状况的影响,并分析了其在幼参体内的富集状况。结果表明:Zn2+、Mn7+单独处理时,幼参在Zn2+浓度低于0.4 mg/L或Mn7+浓度低于0.5 mg/L条件下暴露96 h后死亡率均为0.0%,表明在此对应浓度范围内两种金属离子均无明显的急性毒性作用;随浓度和暴露时间增加,幼参死亡率明显升高,其附壁率呈降低趋势。Zn2+对幼参的24、48、72 h的半致死浓度LC50分别为49.70、1.35、0.82 mg/L,安全浓度(SC)为0.14 mg/L;Mn7+对幼参的48、72、96 h的半致死浓度LC50分别为31.61、4.24、3.13 mg/L,SC为3.16 mg/L。因此,Zn2+对幼参的急性毒性作用强于Mn7+。随着水体中Zn2+与Mn7+浓度的增加,幼参体内重金属元素含量和累积速率总体呈升高趋势,而富集系数呈降低趋势,Zn2+的富集作用强于Mn7+。     

基于可测性分析的高层次寄存器分配算法

为了提高综合后电路的可测性,提出了一种面向电路可测性的寄存器分配方案.该方案首先从已调度的数据流图着手,建立了一种可用于高层次综合的行为级可测性分析方法:对算子模块的门级实现进行门级可测性分析,并进而抽象出算子的行为级可控性/可观性值;在数据流图中,逐级计算出各节点变量的行为级可测性指标;然后按照最大改善可测性指标的原则,进行寄存器分配.在标准电路上的实验表明,除了较小的面积开销外,电路的可测性优于所对照的其他2种方法.     

基于无线Ad Hoc网络的多移动机器人系统

介绍了无线自组织网络及其发展现状和多移动机器人系统.概述了IEEE 802.11DCF协议,并在此基础上阐述Ad Hoc技术用于多移动机器人系统的应用前景,提出了一套实际方案.     

Re-Optimization Algorithm for SoC Wrapper-Chain Balance Using Mean-Value Approximation

Balanced wrapper scan chains are desirable for system-on-chip (SoC) testing because they minimize the time required to transport the test data. A new heuristic algorithm is proposed based on mean- value approximation and implement fast re-optimization as a subsequence of an earlier best-fit-decrease (BFD) method. The mean length of each scan chain was introduced as an approximation target to balance different scan chains and hence saved testing time. Experimental results present both for assumed arbitrary cores and cores from ITC'02 benchmark and show the effectiveness of the algorithm. The proposed algorithm can provide more balanced wrapper design efficiently for the test scheduling stage.     

数模混合片上系统联合测试调度方案

为了降低数模混合片上系统(system on chip,SoC)的测试成本,基于片上虚数字化,提出了并行模拟测试外壳组设计,用数字自动测试设备和测试访问机制完成对各个模拟芯核的并行测试.在此基础上,建立了数模混合SoC测试调度优化问题模型,提出了一种基于递增生成的数模联合调度算法PADCOS,该算法具有复杂度低和优化效...     

Reliable Remote-Monitoring Electrochemical Potentiostat for Glucose Measurements

Electrochemical methods have been widely used in the chemical and pharmaceutical industries, which require accurate concentration measurements, chemical reaction detections and analyses. The electrochemical potentiostat, the core element in electrochemical instruments, have been discussed as a hot topic addressing the difficulty of applying high-precision constant voltage and picoampere current measurements. Meanwhile, reliable potentiostats are in demand for complicated industrial environments with noises as well as requirements of remotemonitors. This paper describes a potentiostat for industrial glucose measurement that is not only accurate but also fault tolerant to guarantee high reliability in industrial environments. The instrument uses standard industrial communication protocols, profibus, and a 4–20 mA current loop, for remote control and monitoring. Experimental results show that this design has 0.01% accuracy with 1 mV resolution for voltage applications and 0.01% accuracy with 1 pA resolution for current measurements. The design is also shown to be highly reliable in noisy environments.