高校校园网内联网计算机的故障分析与维护方案

在高校校园网中,计算机的使用量和计算机的数量与日俱增,无论是负责维护计算机网络教室或者电子阅览室的工程技术人员还是接入校园网的个人用户都会遇到各种各样的计算机故障.本文通过对计算机产生故障现象的分析,对计算机硬件及系统软件的维护提出了解决方法.     

基于0．18um CMOS工艺线性调整器设计

本设计采用0．18umCMOS工艺实现液晶显示器（LCD）控制芯片中的基准源电路，设计增加一级线性调整器电路，将带隙基准电路产生的1．2V左右的带隙电压调整为与数字核心电路所要求的电源电压1．8V的输出电压。通过元器件模型参数的电路仿真，性能指标基本达到要求。     

传真通信实现方式及其基本组成

本文以INTERNET网络传真机系统为对象，论述了系统的实现方法，并介绍了实现系统时所用到的一些关键技术。     

Development of CMOS Digital Image Sensor

The CMOS image sensor has developed from passive pixel sensors and active pixel sensors to digital pixel sensors(DPS),which is the trend of image sensors.The advantage of DPS is that the imaging system can be integrated on a chip as imaging system-on-a-chip,decreasing the cost and power consumption,improving the imaging quality.The A/D conversion is the key component of the CMOS sensor.The authors analyze and compare the theories,performances and features of the chip level,column level and pixel level integrated ADC of the image sensor.They present the present and the future trend of the development about digital image sensor in the home and abroad.     

一种互补式LVTSCR的CMOS芯片ESD保护方法

为实现对CMOS芯片进行ESD防护提出了一种互补式LVTSCR结构,给出了该结构横切面电路模型以及等效电路,分析了工作原理及可行性,并与现有的ESD保护结构进行对比分析,采用ISE-TCAD工具进行仿真实验.结果表明：该结构具有占用面积小,单位面积防护效率高的特性,可有效降低成本.     

四个有特色的CMOSD触发器的逻辑设计

本文给出了我们设计的四个有特色的ＣＭＯＳＤ触发器的逻辑，它们应用于一个ＶＬＳＩ单片微机电路中。文章分析了它们的特点和原理。其主要特点是：①增强了同步控制措施；②“预≈帽与“清除”共用一根控制线以减少芯片面积；③附加功能，提高Ｄ触发器的处理能力。这些适应了ＶＬＳＩ系统设计的要求。     

基于0.18um CMOS工艺线性调整器设计

本设计采用0.18 amCMOS工艺实现液晶显示器(LCD)控制芯片中的基准源电路,设计增加一级线性调整器电路,将带隙基准电路产生的1.2 V左右的带隙电压调整为与数字核心电路所要求的电源电压1.8 V的输出电压.通过元器件模型参数的电路仿真,性能指标基本达到要求.     

Hardware-based image processing for high-speed inspection of grains

A high-speed, low-cost, image-based sorting device was developed to detect and separate grains having slight color differences or small defects. The device directly combines a complementary metal–oxide–semiconductor (CMOS) color image sensor with a field-programmable gate array (FPGA) which was programmed to execute image processing in real-time, without the need of an external computer. Spatial resolution of the imaging system is approximately 16 pixels/mm. The system includes three image sensor/FPGA combinations placed around the perimeter of a single-file stream of kernels, so that most of the surface of each kernel is be inspected. A vibratory feeder feeds kernels onto an inclined chute that kernels slide down in a single-file manner. Kernels are imaged immediately after dropping off the end of the chute and are diverted by activating an air valve. The system has a throughput rate of approximately 75 kernels/s per channel which is much higher than previously developed image inspection systems. This throughput rate corresponds to an inspection rate of approximately 8 kg/h of wheat and 40 kg/h of popcorn. The system was initially developed to separate white wheat from red wheat, and to remove popcorn having blue-eye damage, which is indicated by a small blue discoloration in the germ of a popcorn kernel. Testing of the system resulted in accuracies of 88% for red wheat and 91% for white wheat. For popcorn, the system achieved 74% accuracy when removing popcorn with blue-eye damage and 91% accuracy at recognizing good popcorn. The sorter should find uses for removing other defects found in grain, such as insect-damaged grain, scab-damaged wheat, and bunted wheat. Parts for the system cost less than $2000, suggesting that it may be economical to run several systems in parallel to keep up with processing plant rates.     

CMOS反相器在低电压低功率模拟系统中的应用研究

研究了ＣＭＯＳ反相器在低电压低功率模拟系统中的应用，基于对传统ＣＭＯＳ反相器电路的分析，提出了新颖的一阶低通、高通和全通ＣＭＯＳ滤波器，它具有工作电压低（±１Ｖ）、功耗极低、动态范围宽、元件数少（仅２个ＭＯＳ管）等特点，同时提出了由ＣＭＯＳ反相器构成的能工作在±１Ｖ电源下阈值电压可调的神经元器件，文中所有的电路均经ＰＳＰＩＣＥ软件验证．     

基于视觉传感器的棉花果实定位方法

针对棉花采摘机器人,提出了一种快速、准确的实现棉花果实定位的方法,构建了以CMOS图像传感器为基础的双目图像采集系统。其中,两个由单片机控制的CMOS图像传感器对图像信息进行二值化处理。考虑数据在RAM中的存储形式,采用行列组合法求解果实在单目下的质心平面坐标(以像素点为单位),构建以左目坐标为基准的三维坐标系,单片机对传递过来的同一个果实的两组质心平面坐标,依据立体视差的关系,解得果实的空间坐标,完成果实的定位。