Development of neural networks integrated circuit driving electrostatic motors for microrobot

Artificial Life and Robotics - The authors are studying an insect-type microrobot using Micro-Electro-Mechanical Systems (MEMS) technology. The microrobot actuates by electrostatic motors that use...     

面向高密度柔性集成电路封装基板的精密视觉检测算法

高密度柔性集成电路(IC)封装基板是电子组件的核心载体, 其制造过程中的刻蚀、显影等工艺需要严格的品质控制. 本文开发了一种融合金相显微镜与工业相机的成像视觉检测系统, 用于柔性IC封装基板的图像采集与品质控制. 针对显微成像视野小、易离焦等问题, 提出了一种基于中值的三元模式局部纹理快速自动对焦算法. 此外,针对高倍镜下柔性IC封装氧化缺陷分布不均匀问题, 引入微分几何工具, 利用曲率等几何特征提出了一种基于动态曲线演化的高精度表面氧化分布特征检测模型. 通过定性与定量的实验研究, 验证了两种算法在快速性和高精度方面的优越性能.     

Methods and algorithms for verification of knowledge bases in integrated expert systems

In this paper, a brief analysis is presented and methods of verification of expert systems and conventional programs are compared. The specific features of the verification of knowledge bases of integrated expert systems are shown, methods and algorithms of detecting static and dynamic anomalies in the knowledge field are described.     

多媒体知识库管理系统的Jasmine实现

随着网络技术和知识工程的飞速发展，网络多媒体数据日益增加，提出使用Jasmine面向对象数据库实现多媒体知识库管理系统，探讨了将面向对象，数据库和多媒体技术有机结合，构造出能对知识进行系统化的组织与管理，存储，增加，删除和查询等功能齐全的多媒体知识库管理系统。     

基于仿真的通用模拟电路故障知识获取平台

故障知识获取是基于知识的模拟电路故障诊断方法的瓶颈问题。总结了通过故障仿真获取模拟电路故障知识的一般过程,简要描述了知识获取自动化的方法,提出建立通用模拟电路故障知识获取平台的方案,并对其主要组成部分和功能进行了详细描述。该平台能自动穷举电路所有可能的故障,调用外部电路仿真软件进行仿真,从仿真结果提取故障知识并加以简化,形成结构化的故障知识库。实验结果证实其可行性。     

MEMS可编程光栅动态驱动电路的研制

MEMS可编程光栅的工作性能很大程度依赖于驱动电路的性能。本文根据MEMS可编程光栅的工作特点及结构参数,提取出光栅的等效电容值,并采用集成高压运放研制出一种新型的MEMS可编程光栅的动态驱动电路。为了避免自激振荡的发生,电路中采用了频率补偿和并联反馈电容的方法,有效提高了电路的稳定性。实际电路经过测试,其动态性能与PSPICE10仿真的结果非常吻合。该动态驱动电路具有高的电压输出范围(0~180V),较高的频率响应(10kHz),大范围容性负载能力(1~1000pF),完全能够满足MEMS可编程光栅动态复杂控制的需要。     

PREPARE: a tool for knowledge base verification

The knowledge base is the most important component in a knowledge-based system. Because a knowledge base is often built in an incremental, piecemeal fashion, potential errors may be inadvertently brought into it. One of the critical issues in developing reliable knowledge-based systems is how to verify the correctness of a knowledge base. The paper describes an automated tool called PREPARE for detecting potential errors in a knowledge base. PREPARE is based on modeling a knowledge base by using a predicate/transition net representation. Inconsistent, redundant, subsumed, circular, and incomplete rules in a knowledge base are then defined as patterns of the predicate/transition net model, and are detected through a syntactic pattern recognition method. The research results to date have indicated that: the methodology ran be adopted in knowledge-based systems where logic is used as knowledge representation formalism; the tool can be invoked at any stage of the system's development, even without a fully functioning inference engine; the predicate/transition net model of knowledge bases is easy to implement and provides a clear and understandable display of the knowledge to be used by the system     

烧结法氧化铝配料知识库编辑维护系统的实现

根据烧结法氧化铝生料浆配料机理和长期积累的专家经验知识,设计了一种适用于烧结法氧化铝配料的知识库编辑和维护系统,该系统从生产过程出发,将机理知识和群体专家知识统一为一种形式,通过产生式知识表示,对本系统的知识的特点进行了阐述,然后由知识的特点分别建立有关配料参数、状态、关系等字典,最后对系统的编辑和维护功能的实现进行了说明.实际使用效果表明,该知识库系统操作简单,编辑和维护方便.     

基于PMU的小型集成电路测试系统实现及性能分析

文中给出了一种基于精密测量单元的小型集成电路测试系统的设计方法,并对小功率范围进行详细实验验证。该测试系统将电压/电流钳位技术、比较技术、功率扩展技术、恒流源和恒压源技术和四象限驱动技术等多项技术相结合,能够对被测器件(DUT)施加精确地激励值,并准确测量DUT在激励下的响应,该系统同时具备大功率扩展能力满足多种电路测试的需求。系统借助四通道集成仪表放大器电路,结合嵌入式控制器、功率扩展电路以及上位机控制界面共同完成设计,解决了nA级电流无法准确测量的问题,通过优化补偿电路设计,提高电路测试速度。系统性能分析结果表明,文章所设计的小型集成电路测试系统测量精度高、施加激励稳定可靠、响应速度快,相比类似产品节约2/3的硬件设计成本,能够满足集成电路测试中直流参数测试的要求。     

线阵CCD光谱测量系统的驱动电路设计

以ILX554B线阵CCD为例,分析了该电荷耦合器件的工作原理及驱动时序,介绍一种线阵CCD光谱测量系统的驱动电路的设计方法。设计主要内容包括ILX554B线阵CCD驱动电路和输出信号处理电路。结果表明,各项参数及指标均符合实际工作需要。此设计发挥了单片机的优势,使驱动具有方便、灵活、可靠性高、成本低等优点,能够满足ILX554B芯片多路驱动时序的要求,已用于CCD荧光光谱测量系统中。     

Three-dimensional monolithic microwave integrated circuit technology for fully computer-aided design-compatible monolithic microwave integrated circuit development

This paper presents the advantages of the three-dimensional (3D) masterslice monolithic microwave integrated circuit (MMIC) technology and the application of its technology to computer-aided design (CAD) software. Its high level of freedom in transmission line routing offers design flexibility and the high integration of 3D MMICs. A 20-GHz single-chip receiver and 60 GHz amplifier are demonstrated. The 3D masterslice MMIC technology, an advanced MMIC design method, is effective in making existing CAD software fully CAD compatible by attaching software packages which allow the sharing of parameters between schema and layout, autorouting, customized simulation and database including reference circuits, and so on. Masterslice MMIC CAD software is also developed. © 1998 John Wiley & Sons, Inc. Int J RF and Microwave CAE 8: 498–506, 1998.     

Knowledge structures in a knowledge base

Rough set theory is a useful tool for dealing with imprecise knowledge. One of the advantages of rough set theory is the fact that an unknown target concept can be approximately characterized by existing knowledge structures in a knowledge base. This paper explores knowledge structures in a knowledge base. Knowledge structures in a knowledge base are firstly described by means of set vectors and relationships between knowledge structures divided into four classes. Then, properties of knowledge structures are discussed. Finally, group, lattice, mapping, and soft characterizations of knowledge structures are given.     

Translating a knowledge base into HTML

The problem treated in this paper is the slow response of inference engines, especially in a multi-user environment. In this paper, we present a solution that caches all the possible answers to all the possible consultations, by means of translating the entire knowledge base into a set of HTML documents. We prove that the consumption of memory in this case is acceptable (depends linearly on the number of rules in the initial knowledge base), and that the translational algorithm has polynomial complexity. This solution outperforms any other possible solution, since in this case the infering time becomes equal to zero.     

一种光纤传感器光源驱动电路的设计

半导体激光器作为光纤传感器的光源,其输出功率的稳定度直接影响着光纤传感器的准确度。根据光源的工作原理和输出特性,设计了一种应用于低温环境下的光源驱动电路。该电路基于自动功率控制(APC)原理,并引入了慢启动电路,有效防止了电源电压带来的干扰,延长了激光器的使用寿命。通过实验验证,该电路解决了激光器在使用中输出功率不稳定的问题,其稳定度优于0.5%,达到了较好的稳流效果。     

CCD时序驱动电路的设计

针对L3Vision CCD图像传感器,提出了时序驱动电路的设计方法.在分析CCD时序工作原理的基础之上,采用CCD驱动芯片EL7212和EL7155,完成了成像区、存储区和水平读出寄存器所需时序驱动电路的设计.仿真与实验结果表明:所提出的方法完全满足CCD各项驱动时序的要求.