时域背腔式领结天线的工程化设计

通过分析时域脉冲辐射信号的频谱,确定了天线的工作频率和带宽,并根据在探地雷达应用中满足信号最大能量对地辐射的要求,提出了一种快速有效的时域背腔式领结天线的设计方法,该方法简便实用,便于在探地雷达系统的整体工程化设计中使用。所提出建立的方法得到了实验和数值仿真结果的验证,并在探地雷达整机的开发和设计中得到了成功应用。     

对学术论文如何获得更高的EI收录率的探讨

《工程索引》(EI)要求收录的论文学术水平较高,且具有创新性,对论文的格式也具有一定的要求。论文的学术水平,英文题名、摘要的格式与质量,投稿方向是影响论文能否被EI收录的三个主要因素。     

A kernel smoothing method of adjusting for unit non‐response in sample surveys

Non‐response is a common problem in survey sampling and this phenomenon can only be ignored at the risk of invalidating inferences from a survey. In order to adjust for unit non‐response, the authors propose a weighting method in which kernel regression is used to estimate the response probabilities. They show that the adjusted estimator is consistent and they derive its asymptotic distribution. They also suggest a means of estimating its variance through a replication‐based technique. Furthermore, a Monte Carlo study allows them to illustrate the properties of the non‐response adjustment and its variance estimator.     

论大学生信用贷款的"可能"问题

自我国实行大学生国家助学贷款及信用贷款以来,关于大学生的信用问题、偿债能力的研讨以及案例时有发生.本文认为,只有从理论上弄清大学生信用贷款"何以可能"、"能否可能"的问题,才能真正解决大学生信用贷款"如何可能",从而为国家助学贷款的发放及顺利回收打下良好的基础.     

基于PC的ECU自动测试系统

介绍了汽车安全气囊电子控制单元相关的技术背景、工作原理及其自动测试的必要性,阐述了其研发阶段的系统测试任务、实现方案,及ACU测试环境的搭建和ACU测试的原理。对ECU的自动测试技术进行了总结,指出该方案可用于其他原理上类似的ECU测试工作中。     

Second-order refined peaks-over-threshold modelling for heavy-tailed distributions

Modelling excesses over a high threshold using the Pareto or generalized Pareto distribution (PD/GPD) is the most popular approach in extreme value statistics. This method typically requires high thresholds in order for the (G)PD to fit well and in such a case applies only to a small upper fraction of the data. The extension of the (G)PD proposed in this paper is able to describe the excess distribution for lower thresholds in case of heavy-tailed distributions. This yields a statistical model that can be fitted to a larger portion of the data. Moreover, estimates of tail parameters display stability for a larger range of thresholds. Our findings are supported by asymptotic results, simulations and a case study.     

Jackknife method for intermediate quantiles

Quantile function plays an important role in statistical inference, and intermediate quantile is useful in risk management. It is known that Jackknife method fails for estimating the variance of a sample quantile. By assuming that the underlying distribution satisfies some extreme value conditions, we show that Jackknife variance estimator is inconsistent for an intermediate order statistic. Further we derive the asymptotic limit of the Jackknife-Studentized intermediate order statistic so that a confidence interval for an intermediate quantile can be obtained. A simulation study is conducted to compare this new confidence interval with other existing ones in terms of coverage accuracy.     

FIR线性数字滤波器在数字电视中的应用

FIR滤波器具有严格的线性相位和任意的幅度特性 ,能满足数字电视对信号的实时处理和高保真度的要求 ,目前已有计算机程序可资利用 ,使得FIR滤波器的设计大大简化 ,因而使线性相位FIR滤波器在数字电视的亮、色信号分离电路中得到了广泛的应用。     

基于电容近感原理的无源探测信号分析

无源近感探测系统信号处理模块中的振荡网络设计是产生探测信号的关键所在,系统通过产生准静电场敏感近距目标的存在与否。鉴于此,讨论了一种基于电容原理的无源近感探测系统的探测信号。通过对三导体进行电磁分析,描述了探测信号产生的机理。仿真实验指出了相关部件设计的关键点所在,并描述了不同弹目交会条件下,鉴频信号变化的特点。     

技术的伦理评价

本文首先分析了对技术进行伦理评价的可能性和必要性。在此基础上,从人的利益、价值观的角度对技术的伦理评价的本质和特点作了初步分析,指出技术的伦理评价的本质是人们对自身利益的终极关怀,是对人性、人的利益和价值观的评价。对技术的伦理评价具有过程性、多元性和差异性、历史性和具体性的特点。