光电摆角动态测量原理及其测量系统

本文阐述了用于测量物体摆角及摆心浮动量的光电动态实时测量原理,以及根据此原理研制的光电导弹喷管摆角动态测量系统。     

多功能滚齿机的数字控制系统

本文叙述了以ＳＴＤＰＣ／ＸＴ（或ＰＣ／ＡＴ）机为主要核心构成的滚齿机数字控制系统的结构，软件设计和特点，系统采用混合语言编程，极大地提高了软件设计的灵活性与快速性，也分析了ＣＮＣ系统的加工过程，提出了加工中的软件预处理控制方法，并给出了轴伺服控制的并行算法分析与实现。     

灌溉水库水资源优化调度

以榆社云簇水库为例、以水库灌区多种作物所能达到的最大产值为目标函数，本文研究了一套灌溉水库用水优化调度模型。它包括计划调度模型和实时调度模型两部分，适用于干旱半干旱地区灌溉水量不足的水库的用水调度。     

Two-tier architecture for unconstrained handwritten character recognition

In this paper, we propose an approach that combines the unsupervised and supervised learning techniques for unconstrained handwritten numeral recognition. This approach uses the Kohonen self-organizing neural network for data classification in the first stage and the learning vector quantization (LVQ) model in the second stage to improve classification accuracy. The combined architecture performs better than the Kohonen self-organizing map alone. In the proposed approach, the collection of centroids at different phases of training plays a vital role in the performance of the recognition system. Four experiments have been conducted and experimental results show that the collection of centroids in the middle of the training gives high performance in terms of speed and accuracy. The systems developed also resolve the confusion between handwritten numerals.     

检测骨架图形特征点的新方法

端点、折点、歧点和交点是骨架图形的重要特点是，提出用快速查表法检测侯选特征点，再进行侯选特征点聚集，用局部结构分析，去除假特征点，判别真特征点的类型，并对折点给以大致的定量描述。实验结果表明，该方法能快速有效地找出骨架图形的特征点，在目标识别、字符识别等应用中起着关键作用。     

快速Hartley变换在实时相关器中的应用

快速Ｈａｒｔｌｅｙ变换（ＦＨＴ）是离散Ｈａｒｔｌｅｙ变换（ＤＨＴ）的快速算法，它是一种实序的变换，其正反变换具有完全相同的形式。利用ＦＨＴ进行实数据相关可以避免复数运算，特别适用于采和可编程数字信号处理器（ＤＳＰ）来实现的实时相关器。和ＦＦＴ相关算法相比，在保持同样数据吞吐率的情况下，采用ＦＨＴ方法，可显著减少系统所需的高速存贮器，从而，可降低系统的成本。本文讨论了ＤＨＴ的有关性质和ＦＨＴ算法和运     

应用并行技术实现CAD／CAM的高度集成

传统的CAD/CAM系统由于设计思想本身的局限性,其内部只能达到一种松散的基于数据交换的低水平的集成,产品的设计方法也不符合工程技术人员的设计思路。本文提出了基于全耦合的单一数据模型的并行CAD/CAM系统设计思想,使得CAD/CAM系统内部达到以数据共享为基础的高度集成。并行CAD/CAM系统充分体现了工程技术人员的思维方式及产品设计过程的反复性和协调性。此外,文中还提出广义参数化设计的新概念,它与特征设计方法的有机结合保证了产品模型的完整性和产品设计过程的同步性。特征共享是实现CAD和CAM集成的关键因素。并行CAD/CAM系统应用面向对象软件设计思想,实现了复杂数据模型的内部封装,并为数据模型和功能模块之间提供简单直观的界面。面向对象设计方法是开发并行CAD/CAM系统的有效手段。     

Application of the blind source separation method to feature extraction of machine sound signals

As the result of vibration emission in air, a machine sound signal carries important information about the working condition of machinery. But in practice, the sound signal is typically received with a very low signal-to-noise ratio. To obtain features of the original sound signal, uncorrelated sound signals must be removed and the wavelet coefficients related to fault condition must be retrieved. In this paper, the blind source separation technique is used to recover the wavelet coefficients of a monitored source from complex observed signals. Since in the proposed blind source separation (BSS) algorithms it is generally assumed that the number of sources is known, the Gerschgorin disk estimator method is introduced to determine the number of sound sources before applying the BSS method. This method can estimate the number of sound sources under non-Gaussian and non-white noise conditions. Then, the partial singular value analysis method is used to select these significant observations for BSS analysis. This method ensures that signals are separated with the smallest distortion. Afterwards, the time-frequency separation algorithm, converted to a suitable BSS algorithm for the separation of a non-stationary signal, is introduced. The transfer channel between observations and sources and the wavelet coefficients of the source signals can be blindly identified via this algorithm. The reconstructed wavelet coefficients can be used for diagnosis. Finally, the separation results obtained from the observed signals recorded in a semi-anechoic chamber demonstrate the effectiveness of the presented methods .     

Internet环境下漫游系统中的视点控制技术

在研究了基于Web的虚拟真实漫游系统的应用前景的基础上,利用VRML的网络特性以及内置接口语言Java和JavaScript,对系统中的视点绑定、视点动画交互等关键技术进行了详细的阐述,并给出了相应的VRML程序。     

基于网络的实时数据采集系统的应用

介绍了中国石油抚顺石化分公司实时数据采集系统的系统结构、软硬件平台、系统具有的功能，以及与现场DCS连接类型的实例。该项目自2002年开始实施，目前已实现41套装置，近2万点数据的采集。该系统为公司进一步加强管理，提高工作效率，增强公司整体竞争能力，发挥了重要的作用。