低轨移动卫星异步多用户检测算法

介绍了一种适合在低轨(LEO)星载接收机上运行、低复杂度的异步CDMA多用户检测算法,能够有效对抗强多用户干扰和大多普勒频移。基带信号通过码片滤波后以码速率采样信号作为观测信号,然后利用Kalman滤波算法对各个用户信号进行分离。状态方程综合考虑了多普勒频移、定时误差。该算法能够抵抗高达35dB的远近效应,并且对频率和定时误差不敏感。     

陆军导弹武器系统测试性研究

针对陆军导弹武器系统的特点,论述了系统测试性和系统测试性设计的基本概念,在解释它们内涵的同时,说明了如何从本质上理解它们在导弹武器系统全寿命周期中的重要作用。为了保持系统的良好测试性,从定量和定性两个方面提出了测试性设计的基本要求,研究了提高系统测试性的主要方法。     

静电放电辐射场的实验研究

对人体 -金属ESD模型和家具ESD模型进行了讨论 ,介绍了其放电电流波形的主要特点及影响它们的主要因素。利用单极子天线和数字存储示波器对静电放电产生的电磁脉冲辐射场进行了实验研究。实验表明 ,ESD的辐射场在距离放电源几米以内是很短的窄脉冲 ,其脉冲持续时间约为几百ns,但其场强很大 ,典型可达几kV/m (在 1 8cm处 ) ,一般在约几百V/m (在 1 5m以内 ) ,共频谱主要分布在几十到几百MHz,频谱上限可以达到几个GHz.     

脉冲高电压的频率对电容分压器性能的影响

研制了一种测量脉冲高电压的电容分压器,从理论和实验两个方面分析了高电压脉冲的频率对电容分压器分压比的影响。并用此电容分压器测量了Tesla变压器型强流电子束加速器的谐振特性波形,测量结果与理论分析一致。     

利用波形合成技术对柴油机排气噪声实行有源控制的研究

对四冲程柴油机(4-85)的排气噪声的机理和特性进行了研究;利用波形合成的原理,控制高速信号处理芯片TMS320C25合成次级声源的声波,可以实现宽带消声．对柴油机的排气噪声进行了有源消声的初步设计．     

Multivariate meta analysis with potentially correlated marketing study results

A univariate meta analysis is often used to summarize various study results on the same research hypothesis concerning an effect of interest. When several marketing studies produce sets of more than one effect, multivariate meta analysis can be conducted. Problems one might have with such a multivariate meta analysis are: (1) Several effects estimated in one model could be correlated to each other but their correlation is seldom published and (2) an estimated effect in one model could be correlated to the corresponding effect in the other model due to similar model specification or the data set partly shared, but their correlation is not known. Situations like (2) happen often in military recruiting studies. We employ a Monte‐Carlo simulation to evaluate how neglecting such potential correlation affects the result of a multivariate meta analysis in terms of Type I, Type II errors, and MSE. Simulation results indicate that such effect is not significant. What matters is rather the size of the variance component due to random error in multivariate effects. © 2000 John Wiley & Sons, Inc. Naval Research Logistics 47: 500–510, 2000.     

Estimating distribution functions from partially observed samples

Suppose that some components are initially operated in a certain condition and then switched to operating in a different condition. Working hours of the components in condition 1 and condition 2 are respectively observed. Of interest is the lifetime distribution F of the component in the second condition only, i.e., the distribution without the prior exposure to the first condition. In this paper, we propose a method to transform the lifetime obtained in condition 1 to an equivalent lifetime in condition 2 and then use the transformed data to estimate F. Both parametric and nonparametric approaches each with complete and censored data are discussed. Numerical studies are presented to investigate the performance of the method. © 2000 John Wiley & Sons, Inc. Naval Research Logistics 47: 521–530, 2000     

实施课题立项,推进教学改革

实施教学改革立项是推进院校教学改革的有效途径,结合实践,对教学改革立项的规划、组织、实施与管理,以及需注意的问题等进行了研究与探讨.     

有约束的Hartley域自适应算法的应用研究

通过对有约束的Hartley域自适应算法、频域自适应算法及时域自适应算法用于自适应降噪系统的计算机仿真研究 ,认为在自适应通信降噪中采用基于Hartley变换的自适应算法较频域自适应算法及时域自适应算法性能更优、降噪效果更好 ,并在高速信号处理器TMS32 0C30上开发实现了该算法 .实验结果表明 ,将Hartley域自适应算法应用于通信降噪系统 ,方法实际可行     

加强党性党风建设 提高党员干部的整体水平

党性党风建设历来是我党高度重视的一个问题。高校领导干部亦不例外。目前 ,高校基层党员干部普遍存在政治理论水平不高 ,道德修养变形 ,党的意识淡薄等现象。要想提高高校基层党员干部党性党风建设的整体水平 ,就必须加强对其进行政治理论教育和道德教育 ,同时加强制度建设。唯有此 ,才能提高基层管理者的管理水平和整体办学层次