A.I. Kayssi: Delay modeling of CMOS clock drivers

A delay model for CMOS clock drivers loaded by resistive–capacitive interconnect is derived using dimensional analysis. A model for a purely capacitive load is first developed, then the delay model for a capacitor–resistor–capacitor load is derived and verified. The implementation of the delay function for the clock driver uses a combination of lookup table and analytical functions. The accuracy of the models is shown to be within 5% of detailed circuit simulation of a 0.18-micron CMOS process. A simple formula is also given to help in determining whether the resistance of the interconnect has any significant shielding effect on the clock driver.     

基于数字温度计DS18B20的温度测量仪的开发

传统的温度测量系统通常需要对采样电压进行信号放大和A/D转换,介绍了基于数字式温度计DS18B20的温度测量仪的硬软件开发过程,DS18B20将温度信号直接转换为数字信号,实现了与单片机的直接接口,从而省去了信号调理电路。该仪器电路简单、功能可靠、测量效率高,很好地弥补了传统温度测量方法的不足。     

基于MDA的工作流门户整体风格的配置

针对不同的企业对业务过程管理有不同需求的问题，提出了可配置整体风格的业务过程管理门户。通过分析门户的组成来讲述门户整体风格配置所涉及的各个方面，并根据MDA（模型驱动框架）的思想给出具体的实现方案和步骤。     

Performance evaluation of a new BPSK-OFDM timing estimation algorithm

Previously, the timing estimation in OFDM system employs cyclic prefix has been presented with the assumption of independent identified distributed OFDM symbol. The information used to find the symbol synchronization depends on the length of cyclic prefix. Actually, the data in the BPSK-OFDM modulated symbol, transferred by inverse fast Fourier transform, is with a complex symmetry character. With this character, more information from the whole OFDM symbol could be provided for the symbol timing. In this paper, the proposed algorithm uses the autocorrelation of the received signal to obtain the symbol timing. The simulation of Beek’s algorithm and the proposed scheme are presented. The performances of these algorithms are evaluated based on the missing symbol probability and the estimator mean square error. The simulation results show that the proposed algorithm is suitable to achieve a better symbol synchronization.     

基于正弦波形的定时同步算法

针对突发通信的定时同步问题,提出一种基于正弦波形的快速定时同步算法。利用四个平均幅值点确定一条正弦曲线估计出定时误差,既能够实现4倍符号速率的定时同步,又避免了传统最大似然估计法需要进行的大量乘法运算,能够实现定时误差的快速估计。最后利用MATLAB进行Monte Carlo仿真实验,仿真结果表明新算法不仅具有低的复杂度,还具有高的估计精度。     

Capacitance fluctuations in bulk MOSFETs due to random discrete dopants

Accuracy of timing in circuits and systems using nanoscale transistors is crucial and is dependent, to first order, on the capacitances of the load transistors. It is accepted that variation in parameters will be intrinsic to such devices due to, among other factors, the discrete nature of the doping. It is likely that one such parameter exhibiting variation will be capacitance. Here we investigate, using 3-dimensional simulation, the fluctuation in gate and drain capacitance in a 30 nm MOSFET due to random discrete doping.     

湿陷性黄土地区桩基础的应用分析

本文通过实例 ,对湿陷性黄土地区常见的桩基础从施工工艺、设计计算、桩基检测、适用范围、常见问题及对策和经济指标各个方面进行分析论述 ,总结该地区桩基础选型原则及其发展趋势     

3-RPC型并联机器人模糊滑模轨迹跟踪控制研究

分析了直流伺服电机驱动的3-RPC并联机器人的运动学反解,并对其进行了轨迹规划;设计了传统滑模控制及模糊滑模控制,建立了仿真模型,并完成了各支路的期望运动的轨迹跟踪。仿真结果表明:模糊自适应增益滑模控制比传统滑模控制精度更高,响应时间明显更快,更能有效地消弱控制中带来的抖振现象。     

利用案例驱动促进计算机课堂教学优化的策略

案例驱动教学模式是一种非常适合高校计算机课堂的教学方式。详细阐述计算机课堂案例教学的策略，包括案例的选取、案例教学的进行、学习方式及评价等。对高校计算机课堂教学的改革具有现实的指导意义。