记忆的测量模型

本文讨论了正态分布下的信号检测法，对数分布下的信号检测法，双高阈限模型法和非参数模型法等四种具有代表性的记忆测量模型并对以上模型的分辩力指标和反应倾向指标作了分析说明．     

斜拉桥主梁损伤对车激索力响应的影响研究

以斜拉桥的损伤识别为目的,提出了一种索力比指标,研究了斜拉桥在车辆荷载激励下,主梁发生损伤时斜拉索索力比指标的变化规律。以实验室独塔斜拉桥试验模型为研究对象,基于ANSYS建立其空间板壳有限元模型,以单元刚度的折减模拟主梁损伤,对主梁在不同位置损伤、不同程度损伤两类工况下,车辆荷载激励下斜拉索的索力比指标变化进行了数值仿真。结果表明：车辆荷载激励下,斜拉索的索力比指标与主梁的损伤位置和损伤程度存在一定的对应关系。为后续基于车辆荷载激励下的索力响应指标识别斜拉桥损伤方法的研究提供了重要的参考,具有一定的理论意义。     

转型与整合——90年代前期长篇小说叙事语境及策略

针对耦合非线性混沌振子复杂的动力学行为,本文将Duffing振子和Van der Pol振子进行耦合,建立了Duffing振子和Van der Pol振子的耦合模型。与单个振子相比,耦合Duffing振子和Van der Pol振子表现出了更加丰富的动力学特性,采用Simulink仿真的方法,通过不同策动力幅值、不同耦合系数、不同频率下耦合非线性振子的相图和庞加莱截面图分析了耦合非线性振子的动力学行为,研究了耦合振子对微弱周期信号的敏感性和对噪声的免疫力,并将此模型应用于微弱信号检测的研究中。     

唯物史观视域中的历史虚无主义

介绍了光纤光栅激光传感器的传感机理和信号的解调算法,设计并实现了一种基于LabView光纤传感检测系统。实验得出该传感检测系统成功解调传感器被测信号,系统噪声达10-6 pm/[KF（]Hz[KF）],动态范围达到了120 dB@100 Hz,线性度达到了0.999 9。结果表明：该检测系统性能可靠,可对光纤光栅传感器信号进行实时的解调。     

多孔介质内流体相态特征超声波探测研究进展

目前有关烃类流体相态的研究已较为成熟,能为油气田的高效开发提供相应的理论指导和技术支持。但研究成果大多忽略多孔介质对流体相态的影响。为此,在充分考虑流体与多孔介质相互作用的基础上,开展多孔介质内流体相态特征的研究十分必要。随着研究的不断深入,超声波探测技术不受压力温度限制、不改变流体成分、检测成本低、对人体无害等优点逐渐得到重视,并在多孔介质内相态研究领域逐渐得到了应用。在参考国内外相关文献资料的基础上,简述了超声波的探测机理,重点综述了超声波探测在多孔介质内天然气水合物、凝析油气相态特征研究的应用进展,并指出了目前存在的主要问题及今后的研究重点。     

An online copy number variant detection method for short sequencing reads

The availability of the next generation sequencing (NGS) technology in today's biomedical research has provided new opportunities in scientific discovery of genetic information. The high-throughput NGS technology, especially DNA-seq, is particularly useful in profiling a genome for the analysis of DNA copy number variants (CNVs). The read count (RC) data resulting from NGS technology are massive and information rich. How to exploit the RC data for accurate CNV detection has become a computational and statistical challenge. We provide a statistical online change point method to help detect CNVs in the sequencing RC data in this paper. This method uses the idea of online searching for change point (or breakpoint) with a Markov chain assumption on the breakpoints loci and an iterative computing process via a Bayesian framework. We illustrate that an online change-point detection method is particularly suitable for identifying CNVs in the RC data. The algorithm is applied to the publicly available NCI-H2347 lung cancer cell line sequencing reads data for locating the breakpoints. Extensive simulation studies have been carried out and results show the good behavior of the proposed algorithm. The algorithm is implemented in R and the codes are available upon request.     

时频混合重叠复用系统的快速检测算法

为提高通信系统的频谱效率,研究了一种时频混合重叠复用系统,并提出针对该系统的基于Gabor变换的快速检测算法和利用误差反向传播思想的改进检测算法。实验结果表明,与利用最大似然序列估计检测算法相比,该算法在牺牲部分性能的条件下,检测速度大幅提高,且系统性能和检测速度做了很好的折衷,在较高信噪比时仍然优于相同频谱效率的高阶调制。采用相互重叠的信号复用传输方式直接提高传输速率比使用同样频谱效率的高阶QAM调制能带来更大的增益。     

SAR的海洋遥感探测技术综述

从研究SAR的海洋遥感探测重要性和基本特点出发,概述了SAR系统的海洋遥感探测技术所涉及的主要研究内容,针对海洋环境要素分布的随机性和时变性,研究了海面微波散射特性和SAR的海面成像机理,给出了研究结果;分析了SAR系统主要特点,提出研究包括系统的宽测绘带特性和雷达的弱信号获取、海面精确成像算法和时空相关性等方面;同时探讨了海洋目标检测的技术途径,以满足SAR系统海洋观测应用的需要.     

Poliovirus Surveillance by Examining Sewage Water Specimens: Studies on Detection Probability Using Simulation Models

Efficiency of environmental surveillance of poliovirus circulation was studied using simulation models. First, three transmission models were defined for describing different scenarios of poliovirus infections in a large unstructured population. Second, environmental factors, such as the total volume of the sewage network and losses of viruses, were modeled for computing the virus output at the sewage sampling site. Third, the effect of sampling and laboratory procedures was accounted for in the probability of detection, given the amount of polioviruses in a specimen. The simulation model can be used for theoretical assessments of the likely efficiency of environmental surveillance, compared with acute flaccid paralysis (AFP) surveillance. Under reasonable assumptions in a vaccinated population, the AFP surveillance can be outperformed if the poliovirus outbreak is not large. However, this depends on the assumed case-to-infection ratio and on the sampling frequency of the sewage water specimens. Increasing the latter will lead to a higher detection probability, which will further enhance the method based on environmental surveillance.     

高校校园网P2P流量检测和分类研究

随着P2P技术的发展及网络流量的急剧增加,如何对不同类型的流量进行控制成为各园区网络管理人员要加以解决的问题。文章提出一种基于主机行为的流量检测方法。该方法不对数据包载荷部分的内容进行检测,而是分析主机通信时的连接特征,并根据特征得到流量的分类。