新丰江大坝监测自动化系统的成功实施与现场维护

本文介绍了新丰江大坝监测自动化系统从失败走向成功的实施过程，强调了良好的工作环境以及精心的现场维护在大坝监测自动化应用中的重要性。     

基于SDL的通信软件维护模型SMM

软件维护是软件生存周期的一个重要且花费很大的阶段，维护工作的自动化是软件行业十分迫切的需要。本文提出了一个基于ＩＴＵ－ＴＳＤＬ语言的通信软件维护模型ＳＭＭ。在此模型中，软件维护被分成三个部分：建立面向维护的数据库，制定维护规范和基于功能转换的自动维护。该模型将有助于软件维护支撑环境的建立     

A Low-Power Wide-Dynamic-Range Analog VLSI Cochlea

Low-power wide-dynamic-range systems are extremely hard to build. The biological cochlea is one of the most awesome examples of such a system: It can sense sounds over 12 orders of magnitude in intensity, with an estimated power dissipation of only a few tens of microwatts. In this paper, we describe an analog electronic cochlea that processes sounds over 6 orders of magnitude in intensity, and that dissipates 0.5 mW. This 117-stage, 100 Hz to 10 KHz cochlea has the widest dynamic range of any artificial cochlea built to date. The wide dynamic range is attained through the use of a wide-linear-range transconductance amplifier, of a low-noise filter topology, of dynamic gain control (AGC) at each cochlear stage, and of an architecture that we refer to as overlapping cochlear cascades. The operation of the cochlea is made robust through the use of automatic offset-compensation circuitry. A BiCMOS circuit approach helps us to attain nearly scale-invariant behavior and good matching at all frequencies. The synthesis and analysis of our artificial cochlea yields insight into why the human cochlea uses an active traveling-wave mechanism to sense sounds, instead of using bandpass filters. The low power, wide dynamic range, and biological realism make our cochlea well suited as a front end for cochlear implants.     

Inference and retrieval of facial images

Attempts have been made to extend SQL to work with multimedia databases. We are reserved on the representation ability of extended SQL to cope with the richness in content of multimedia data. In this paper we present an example of a multimedia database system, Computer Aided Facial Image Inference and Retrieval system (CAFIIR). The system stores and manages facial images and criminal records, providing necessary functions for crime identification. We would like to demonstrate some core techniques for multimedia database with CAFIIR system. Firstly, CAFIIR is a integrated system. Besides database management, there are image analysis, image composition, image aging, and report generation subsystems, providing means for problem solving. Secondly, the richness of multimedia data urges feature-based database for their management. CAFIIR is feature-based. A indexing mechanism,iconic index, has been proposed for indexing facial images using hierarchical self-organization neural network. The indexing method operates on complex feature measures and provides means for visual navigation. Thirdly, special retrieval methods for facial images have been developed, including visual browsing, similarity retrieval, free text retrieval and fuzzy retrieval.     

起重机吊钩拖动绕线电动机他励双高调速系统

本文提出励磁电流可自动控制的他励式双高调速系统设计方案。系统在提升特别是在下放重物时，具有较硬的机械性；在负载１０－１００％的变化范围内，可实现最大偏差Δｎｍａｘ／ｎｍｉｎ１００％≤１０％，调速范围Ｄ≥１０；在满载运行条件下，可节约电能８０％以上。     

An automatic torque ripple compensation system for direct drive motors

A serious problem in motion control is the occurrence of torque ripple. Since a direct drive (DD) motor with a magnet rotor uses a rare-earth magnet, the torque ripple is more serious than that of conventional servomotors. This paper presents an auto-compensation of torque ripple using a software-implemented torque observer. The frequency and amplitude of torque ripple can be obtained in the controller by using the estimated torque from an observer, and the autonomous generation of a compensating current component for a torque ripple is possible. The proposed algorithm has been verified by experiments.     

潜油电动机滑行时间的自动测量

潜油电动机滑行时间是评定电动机装配质量的重要指标。鉴于手工测量电动机滑行时间存在效率低和误差较大的不足,设计了潜油电动机滑行时间自动测量系统。它通过分压电路和计算机自动测量系统测量潜油电动机定子上感应的电压变化状况,即可得到电动机滑行时间。用手工测量、波形分析和自动测量3种方法测量6种型号电动机的滑行时间,其中5种滑行时间长于3s,判定为合格;1种滑行时间短于3s,判定为不合格。3种方式测量的滑行时间具有较好的一致性,仅波形分析法得出的滑行时间比自动测量的滑行时间稍长,表明自动测量方法的精度和重复性可满足要求。     

引黄五座泵站火灾自动报警及联动控制系统

介绍了引黄工程五座泵站的火灾自动报警系统的组成及功能，对泵站的火灾探测系统、报警系统、联动控制系统、灭火系统、控制台等原理进行了详细说明，供同行参考借鉴。     

闸门自动启闭控制系统在冯家山水库的建设与运用

经过两年多的努力,冯家山水库闸门自动启闭控制系统于2006年3月建成.初步投入运用后,该系统在精确度、安全性、可靠性等方面均取得了较好的效果,值得类似水库自动化建设时参考.     

结晶器液面自动控制系统在唐钢板坯连铸机的应用

介绍了涡流法和同位素法2种结晶器钢水液面自动控制检测方式,及其在唐钢板坯连铸机的应用.