压电式微定位工作台及其控制系统

为了提高机床的定位精度，研究、设计了一种以柔性铰链为导向元件、压电陶瓷为驱动器的微定位工作台。微定位工作台在滚珠丝杠副驱动的基础上，对工作台进行了二次精定位。给出了工作台的设计简图，并对其动力学模型进行了分析，结合检测装置和微机控制系统，设计了基于前馈控制同数字PID反馈控制相结合的复合控制的微定位控制系统。实测表明，微定位工作台定位分辨率可达到0．01μm，可满足精密、超精密加工的需要。     

几种基于最大互信息准则的联合均衡方法性能比较

在块传输系统中，采用预编码—后均衡相结合的联合均衡技术能够有效克服信道的色散效应。本文针对无线信道中三种用滤波器组实现的块传输系统的联合均衡方法，就系统的最大互信息量和误码率性能作了分析比较。理论分析和仿真结果表明，作者提出的MMI—DFEl方法具有最佳性能。     

Multi-User MIMO Mobile CDMA Uplink System Employing Turbo Coding and Joint Detection Through a Multipath Rayleigh Fading Channel

In this paper, a generalized multiple-input multiple-output (MIMO) antenna system that can be fitted to the uplink of a wireless communication system is considered for the general case of multi-user. At the transmitter, the information bits are Turbo coded, then interleaved and passed through a serial-to-parallel converter. The channel is assumed bad urban suffering from multipath Rayleigh fading resulting in inter-symbol and multiple access interferences (ISI and MAI). At the front-end of the receiver, a number of receiving antennas are used followed by a joint multi-user estimator based on the Minimum Mean Square Error Block Linear Equalizer (MMSE-BLE).Computer simulations demonstrate a significant performance improvement in both single user and multi-user cases.This paper depends in parts on that presented at the 11th European Wireless Conference, Cyprus, Nicosia, pp. 187–192, April 2005. Yasmine A. Fahmy was born in Guiza, Egypt, on June 4, 1976. She received the B.Sc., M.Sc. and Ph.D. degrees in Communication and Electronics engineering from Cairo University, Egypt on 1999, 2001 and 2005 respectively. She is presently an assistant professor at Cairo University, Egypt. Her current field of interest is wireless communication and channel estimation. Hebat-Allah M. Mourad received her B.Sc., M. Sc. and Ph.D. degrees in electrical communication engineering from Cairo University, Egypt, in 1983, 1987 and 1994 respectively. Since 1983, she has been with the Department of Electronics and Communications, Faculty of Engineering, Cairo University, and is currently associate professor there. Her research interests include optical fiber communications, mobile and satellite communications. Emad K. Al-Hussaini received his B.Sc degree in Electrical Communication Engineering from Ain-Shams University, Cairo, Egypt, in 1964 and his M.Sc and Ph.D. degrees from Cairo University, Giza, Egypt, in 1974 and 1977, respectively. From 1964 to 1970, he was with the General Egyptian Aeroorganization. Since 1970, he has been with the Department of Electronics and Communications, Faculty of Engineering, Cairo University, and is currently professor there. He was a research fellow at Imperial College, London, UK, and at the Moore School of Electrical Engineering, University of Pennsylvania, Philadelphia, PA, USA, in the academic years 1976/1977 and 1981/1982, respectively. In 1990, he received the Egyptian national encouragement award for outstanding engineering research. He has written several papers for technical international journals and conferences. His research interests include signal processing, fading channel communication, modulation, and cellular mobile radio systems. Dr Al-Hussaini is a senior member of IEEE. He is listed in Marquis Whos Who in the World and in the IBC (International Biographical Center, Cambridge) for outstanding people of the 20th century.     

对美军联合战术信息分发系统的通信干扰研究

根据联合战术信息分发系统（JTIDS）的工作方式和信号特点,探讨了干扰JTIDS的技术样式,分析了对JTIDS进行组合干扰（由宽带噪声干扰与非相干瞄准式伪码扩频干扰构成）的效果．提出了有效干扰JTIDS的具体方法。     

可堆积饼式旋转关节的设计

提出了可堆积饼式旋转关节的结构原型,介绍了设计该旋转关节时需要考虑的因素以及关键部分的设计方法,并且设计加工了一个L波段饼式旋转关节,给出了实验结果,验证了该方法的可行性。     

联合变换相关法测量空间相机像移的实验研究

为了测量由卫星姿态不稳定或振动等原因引起的空间相机的亚像元像移,使用了光学联合变换相关(JTC)的方法对安装在相机焦面上的辅助面阵CCD采集到的相邻两帧图像进行相关运算.给出了使用该方法测量像移的原理,搭建了实现JTC的光学平台,对JTC测量相机像移的性能进行了实验研究.结果表明,使用联合交换相关器可以测量空间相机的亚像元像移,测量误差服从均值为0的正态分布,在显著水平为0.05下,像移测量误差的均方差不大于0.12个像元,完全满足空间相机的使用要求.     

基于全局运动补偿的红外目标变换相关跟踪算法

提出了一种新的前视红外序列图像目标跟踪方法.利用基于区域分割和模板匹配的全局补偿算法进行运动估计,有效消除了运动平台中摄像机运动对跟踪性能带来的不利影响.同时,采用二元联合变换相关器进行红外目标的检测与跟踪.通过将振幅调制的功率谱转化为脉冲调制的功率谱,可以获得更清晰尖锐的相关峰,提高了算法的鲁棒性.实验结果表明,该方法是有效的和稳健的.     

An automated patient monitoring using discrete‐time wireless sensor networks

In recent years, Internet of Things (IoT) devices are used for remote health monitoring. For remotely monitoring a patient, only the health information at different time points are not sufficient; predicted values of biomarkers (for some future time points) are also important. In this article, we propose a powerful statistical model for an efficient dynamic patient monitoring using wireless sensor nodes through Bayesian Learning (BL). We consider the setting where a set of correlated biomarkers are measured from a patient through wireless sensors, but the sensors only report the ordinal outcomes (say, good, fair, high, or very high) to the sink based on some prefixed thresholds. The challenge is to use the ordinal outcomes for monitoring and predicting the health status of the patient under consideration. We propose a linear mixed model where interbiomarker correlations and intrabiomarker dependence are modeled simultaneously. The estimated and the predicted values of the biomarkers are transferred over the internet so that health care providers and the family members of the patient can remotely monitor the patient. Extensive simulation studies are performed to assess practical usefulness of our proposed joint model, and the performance of the proposed joint model is compared to that of some other traditional models used in the literature.     

Multisim和LabVIEW联合仿真在高职传感器课程教学中的应用研究

我院应用电子技术、工业机器人技术等专业都开设了传感器课程,该课程主要介绍各类传感器的基本原理及典型应用.随着仿真技术的发展,传感器教学中也引入了仿真技术辅助教学以提高教学效果,但是目前用于电子电路仿真软件中的传感器模型较少,很难实现传感器技术的信息化教学.针对这一情况,提出了采用Multisim和LabVIEW联合仿真来进行传感器的教学以提高教学质量,完成教学目标.Multisim和LabVIEW的引入进一步完善项目教学法,改进了学生学习方式提高学生学习效率,并且有利于学生创新能力的培养,值得推广.     

无铅倒装焊点的热应力与湿热应力分析

板上倒装芯片（FCOB）作为一种微电子封装结构形式得到了广泛的应用。微电子塑封器件中常用的聚合物因易于吸收周围环境中的湿气而对封装本身的可靠性带来很大影响。文章采用有限元软件分析了潮湿环境下板上倒装芯片下填充料在湿敏感元件实验标准MSL-1条件下（85℃／85％RH、168h）的潮湿扩散分布,进而分别模拟计算出无铅焊点的热应力与湿热应力,并加以分析比较。论文的研究成果不仅对于塑封电子元器件在潮湿环境中的使用具有一定的指导意义,而且对于FCOB器件在实际应用中的焊点可靠性问题具有一定的参考价值。