共查询到20条相似文献,搜索用时 0 毫秒
1.
《Microelectronics Journal》2014,45(11):1401-1415
Memristors have uses as artificial synapses and perform well in this role in simulations with artificial spiking neurons. Our experiments show that memristor networks natively spike and can exhibit emergent oscillations and bursting spikes. Networks of near-ideal memristors exhibit behaviour similar to a single memristor and combine in circuits like resistors do. Spiking is more likely when filamentary memristors are used or the circuits have a higher degree of compositional complexity (i.e. a larger number of anti-series or anti-parallel interactions). 3-memristor circuits with the same memristor polarity (low compositional complexity) are stabilised and do not show spiking behaviour. 3-memristor circuits with anti-series and/or anti-parallel compositions show richer and more complex dynamics than 2-memristor spiking circuits. We show that the complexity of these dynamics can be quantified by calculating (using partial auto-correlation functions) the minimum order auto-regression function that could fit it. We propose that these oscillations and spikes may have similar phenomena to brainwaves and neural spike trains and suggest that these behaviours can be used to perform neuromorphic computation. 相似文献
2.
The high potential of memristors as multilevel resistance devices is undermined by their highly non-linear behaviour and a strong dependency on different sources of variability (process, voltage, temperature…). Temperature fluctuations are specially harmful because small thermal variations may significantly modify the operation point of the device. For these reasons the circuitry required to accurately read or write multilevel devices is complex and area demanding, especially if multi-level storage is considered. This work addresses the problem of accurately writing a given resistance value in a memristive cell by using a time-domain architecture found on variable pulses. Temperature resiliency is achieved after performing an in depth analysis of the definition of the resistance levels in the presence of thermal variations. Furthermore, a calibration procedure has been conceived to make the writing circuitry resilient to device to device variations. Experimental results show that the proposed approach is valid for a wide temperature range. 相似文献
3.
引信X射线实时成像自动诊断系统设计 总被引:2,自引:0,他引:2
为解决引信生产过程中的在线诊断问题,基于X射线成像技术和图像处理技术提出了适合在引信生产过程中对其重要零部件进行自动诊断的系统设计方案。本文设计的方案在引信生产诊断中得到了成功的应用。 相似文献
4.
K. Hayatleh A. A. Tammam B. L. Hart F. J. Lidgey 《International Journal of Electronics》2013,100(12):1157-1170
The operation of the conventional current feedback operational amplifier (CFOA) is reviewed and its performance parameters used as benchmarks in the development of a new input stage architecture that provides a common-mode rejection ratio (CMRR) improvement of some 45 dB and offset voltage less than 10 mV. 相似文献
5.
在红外大功率激光功率密度分布的测试研究中,利用平动狭缝采样,通过计算机对采样光斑的灰度处理获得激光功率密度,是一种方便适用的方法.讨论了狭缝非均速运动对采样结果的失真及其校正方法. 相似文献
6.
Muhammad Taher Abuelma’atti Sagar Kumar Dhar 《International Journal of Electronics》2016,103(12):1984-1997
This paper presents four new topologies for emulating floating immittance functions. Each circuit uses two or three current-feedback operational-amplifiers (CFOAs) and three passive elements. The proposed topologies can emulate positive/negative lossless and lossy floating inductances, and positive/negative capacitance, resistance and inductance multipliers in addition to floating frequency-dependent positive and negative resistances. The functionality of the proposed circuits is verified using the Advanced Design System software and the AD844 CFOA. The simulation results are in excellent agreement with the theoretical calculations. 相似文献
7.
电子侦察采用截获信号分析的手段,获取电子干扰和情报侦察所需要的信息。随着数字化和软件化的发展趋势,数字信号处理必定在其中发挥十分重要的作用。近年来,电子侦察技术的进步在很大程度上体现在信号处理技术上。简要地综述了在电子侦察中所使用的信号处理方法的基本思路和手段,试图论述其方法体系,并提出一些观点和评述。 相似文献
8.
9.
云对激光引信测高性能的影响分析及解决方案 总被引:2,自引:1,他引:2
激光引信在弹道导弹上的作用是用于测量并控制弹头的爆炸高度,而云的消光及后向散射会对激光引信的测高性能造成干扰,本文利用激光引信测高方程及接收信噪比公式具体分析和计算了云的影响程度,得出了具有说服力的结论。为解决云的干扰问题,研究了将时变增益控制、多停止脉冲计数、距离选通、脉宽测量等几项抗干扰测距技术结合起来,设计了一种硬软结合的激光引信信号处理方案,以尽可能减小云的干扰影响。 相似文献
10.
11.
通过一个示例介绍了网格及其性能特征,以及网格的安全需求、两种基本的安全结构和网格安全中的关键技术;其次通过对电子商务的安全需求的分析,基于OGSA安全体系结构和多级代理链的思想,给出了基于网格的电子商务安全结构,并对其安全性能进行了分析。 相似文献
12.
基于TS101的多DSP并行视频实时处理系统硬件设计 总被引:2,自引:0,他引:2
为了满足空中微型传感器双目视频导航图像数字化处理系统的实时需求,文中在介绍了在并行处理技术应用背景的基础上,提出了一种基于TS101的多数字信号处理器(DSP)并行双通道视频处理系统的解决方案,并给出了具体硬件实现.目前,该系统能够实现对双目视频图像的实时采集、数字视频合成和实时存储,从而为双目视频图像导航的实时处理奠定了基础. 相似文献
13.
图像加密传送系统的设计与实现 总被引:4,自引:2,他引:4
在一些特殊的应用领域,一些场景图像需要通过网络或其他开放的通信手段发送到指定的工作点,供监控人员使用。由于其中可能存在着敏感信息和保密信息,需要对它们进行保护,防止泄漏。通过采用矩阵变换方法和局部数值调整方法,结合DSP技术实现局部图像加密系统,既保护传送图像信息的安全,又不影响合法用户对图像的使用,可有效地提高我国的远程监测监视能力。 相似文献
14.
Claudio Moraga 《Integration, the VLSI Journal》1984,2(3):243-253
The paper studies the problem of efficiently computing the product of three n × n matrices using O(n2) elementary processors in O(n) time. The problem is relevant in image processing.After a critical analysis of extensions on well-known systolic arrays for matrix multiplication to solve the proposed problem, a systolic system is disclosed, which achieves the optimal VLSI-complexity AT2 = O(n4). 相似文献
15.
16.
17.
18.
19.
视频实时图像处理系统研究及设计 总被引:1,自引:0,他引:1
提出了一种基于实时图像统计特征的处理系统,分析了硬件基本结构,针对该实时系统进行了分析和验证.该系统的进一步研制可以满足当前的远程监控、电视电话和会议电视等诸多视频/图像处理与传输领域应用的需求. 相似文献