Internet AS幂律建模及其参数估计

为了精确建模Internet自治系统层面上的拓扑结构,提出了基于最小节点度和最大节点度的拓扑幂律模型及其参数估计新算法。针对Internet自治系统层拓扑实际测量数据,利用新算法对拓扑幂律模型中的最小节点度、最大节点度以及标度参数进行计算。实验结果表明,由新算法估计的Internet自治系统层拓扑幂律模型的最小节点度为1,最大节点度随网络规模的增大而增大,标度参数的误差与使用最大然似估计法误差一样均非常小,约为2.25。     

基于WSAN的AGVS控制系统模型研究

给出了一种基于无线传感反应网络的自动导引搬运车系统的结构,研究了该系统的控制模型,提出了把无线传感器网络作为控制系统观测器的方法,在此模型基础上讨论了传感器节点模型和定位算法,最后制定了分布式动态路径规划策略。     

悉数软件“潜规则”——揭露软件灰色地带

所谓＂潜规则＂,是指相对于＂元规则＂、＂明规则＂而言的。是指看不见的、明文没有规定的、约定俗成的,但却又是广泛认同、实际起作用的。我们知道餐饮业有消费潜规则、娱乐界有潜规则、旅游行业也有潜规则。这些行业的潜规则经常被媒体所揭露,我们也都习以为常,那么同我们电脑应用紧密相关的各种软件也有潜规则么？让我们一同来揭露软件领域的灰色地带。     

Repetitive learning control of nonlinear systems over finite intervals

Iterative learning control requires initial repositioning, while the time functions to be learned should be of periodicity in repetitive control. However, there are cases in practice where the time-varying unknowns are not periodic but repetitive, and repetitive learning control is applicable with avoidance of initial repositioning. In this paper, repetitive learning control designs are presented for a broader class of nonlinear systems over finite intervals. The Freeman formula is modified and used for sta...     

A two-round honest-verifier zero-knowledge protocol

Since the concept of zero-knowledge protocols was introduced, it has attracted a lot of attention and in turn showed significant effect on the development of cryptography, complexity theory and other areas. The round complexity of a zero-knowledge protocol is a very important efficiency consideration, and it is required to be as small as possible. Generally, it is desirable to have zero-knowledge protocols with constant numbers of rounds. Goldreich and Oren proved that only languages in BPP have one-round a...     

Identifying heavy hitters in high-speed network monitoring

Identifying heavy hitters in a network traffic stream is important for a variety of network applications ranging from traffic engineering to anomaly detection such as detection of denial-of-service attacks. Existing methods generally examine newly arriving items in the stream, perform a small number of operations using a small amount of memory, and still provide guarantees on the identifying accuracy. In high-speed network monitoring, the update speed per item is extremely critical. However, so far as we kn...     

Array errors active calibration algorithm and its improvement

The combined effects of mutual coupling, gain and phase errors, and sensor position errors have great negative impact on the direction-finding performance of the MUSIC algorithm. This paper investigates the calibration of the array errors induced by the three errors. Based on the array errors calibration algorithm (algorithm 1) presented by See, two improved array error-calibrating algorithms are presented. One (algorithm 2) uses the sparseness of mutual coupling matrix, and the other (algorithm 3) utilizes...     

Improvements on radiation-hardened performance of static induction transistor

The radiation-hardened performances of static induction transistor (SIT) have been studied in depth in this paper. The effects of radiation of electron beam on the I-V characteristics, carrier distribution and potential distribution in the channel of SIT have been represented. A large number of electron-hole pairs are generated in the depletion region of reversely biased gate-channel PN junction. The radiation-generated electrons drift towards the drain region at high positive potential, while generated hol...     

高速A/D数据采集的SOPC设计

本论文对高速 A/D 数据采集的 SOPC 系统进行了设计。本设计以美国模拟器件公司的高速 AD 芯片 AD9433为转换芯片,在 Stratix EP2S180 DSP 开发板上进行设计。AD9433直接从信号源采集一个模拟信号转换为12位数据。软件设计中对采集到的数据原封不动地从 DAC904数模转换器输出,从而可以得出输入输出的波形完全一致。     

手写文稿识别的一种后处理方法和系统集成

本文提出了一种词间匹配的后处理方法,利用汉语上下文中词和词之间有一定的联系来对识别结果进行纠错,并综合词匹配、词间匹配和Markov语言模型使各环节之间形成反馈,相互补偿,形成一个较好的组合,以此来提高后处理部分的纠错能力以及稳定性。