林业土地信息管理中的多源遥感图像融合技术

多源遥感图像为林业土地监测提供了更为丰富、精确和详尽的动态信息,提升了遥感技术科技含量和应用价值,在林业土地信息管理中得到日益广泛的重视和应用.然而多源遥感同时也增加了有效图像信息的识别问题.结合多源遥感图像融合的信息处理特点,采用基于模糊径向基函数网络、模糊Kohonen神经网络和模糊自适应谐振网的计算机图像目标识别技术,自主开发设计软件对高分辨率SPOT全色影像的多波段数据信息进行图像融合类别判断.实验证明模糊Kohonen神经网络在识别的精度、速度以及识别率是最佳方法.     

Investigation of point-to-point performance test of touch trigger probes on coordinate-measuring machines

A major factor contributing to the total measuring error of coordinate measuring machines (CMMs) is the performance of the probing sub-system. Probing test methods are typically used to detect errors due to the probing sub-system. The probe performance evaluation method specified in the ANSI B89 standard is investigated in this paper. The sampling plan associated in the probe performance evaluation was tested by using experimental probing data from a CMM. Research findings indicate that the performance of touch trigger probes is overestimated due to a systematic bias in the vertical direction of the best-fit reference ball center in the probe performance test. A two-latitude sampling plan synthesis method based on a pretravel model for touch trigger probes is proposed in this paper. The proposed method can be used to accurately identify the reference ball center in the performance test of touch trigger probes.     

PLC在钢坯温度自动监控系统中的应用

提出了一种以PC＋PLC结构组成的钢坯温度自动监控系统,并对该系统的构成、功能作了介绍。较详细地讨论了系统中PLC的程序设计,包括对AD模块的编程技术;给出了相应的PLC梯形图程序。     

图像集的离散度矩阵及其在人脸图像识别中的应用

本文提出了图像集离散度矩阵的基本概念及用于人脸图像识别的方法。该方法把同一类图像集中的各幅图像的信息矩阵的奇异值向量作为矩阵中的一列构成图像集特征矩阵。把这些矩阵组成一图像库,并找出图像集离散度矩阵和图像库离散度矩阵,从而计算出它们的最佳投影系数。然后,把测试样本的图像集特征矩阵与图像集库中的训练样本图像集的特征按投影系数相比较找出它的相似程度,从而进行人脸图像识别。     

过程建模的Petri网模型

工作流管理的问题由于广泛存在于计算机应用的许多方面而迅速得到发展。本文介绍了一个以扩展的Petri网作为建模工具、以消息队列作为执行机制实现的过程管理的原型系统。该模型描述了活动的并发执行和依赖关系、活动激发的条件、事件顺序及文档管理等信息。执行该模型,在分布、异构、自治的环境中可自动监视、管理和调度工作任务,为业务过程重组、业务过程自动化提供了有力的支持。     

MPEG-7及其应用

MPEG－7是国际MPEG组织正在制订定的第4个MPEG标准,旨在实现多媒体内容描述的标准化。简要介绍了MPEG－7的应用背景、目标、内容及常用术语,并探讨了MPEG－7可能的应用领域。     

Proteome analysis of substantia nigra and striatal tissue in the mouse MPTP model of Parkinson's disease

The dopaminergic neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) replicates many of the pathological hallmarks of Parkinson's disease (PD) in mice via selective destruction of dopamine neurons of the substantia nigra and striatum. Although MPTP has been widely used to study downstream effects following the degeneration of dopaminergic neurons, the underlying mechanisms of MPTP action remain poorly understood. To determine the underlying mechanisms of MPTP action at the protein level, a 2-DE-based proteomics approach was used to evaluate the changes in protein expression in substantia nigra and striatal tissue in C57BL/6 mice after MPTP administration. We identified nine proteins that were markedly altered and are likely to be involved in mitochondrial function, heat shock protein activity, and which contribute enzyme activities for energy metabolism and protein degradation.     

基于神经网络的火电厂烟气含氧量软测量

介绍了测量仪表及过程控制中的软测量技术. 讨论了软测量技术的有关问题和开发策略.提出了基于一种复合型神经网络的火电厂烟气含 氧量软测量模型,并且用它对火电厂烟气含氧量的软测量进行了建模仿真验证,现场不同负荷 下的实测数据仿真验证结果表明了软测量方法的有效性.最后给出了应用前景展望.     

A new strategy for optimizing the parameters updating algorithm of fuzzy neural controller

Fuzzy neural controllers have the advantages of ease for knowledge expression and the ability of self-learning, and are able to control adaptively by updating the fuzzy rules and the membership functions. Nevertheless, the long training time usually discourages their practical applications in industry and the parameters over-updating may make system oscillate extensively. In this paper, a new strategy for optimizing the parameters updating algorithm of fuzzy neural controller is proposed. The only effect of parameters which affects the control performance significantly are updated. Also, based on fuzzy inference, the updating step is adjusted adaptively in accordance with the error and the change of error of the system. Two examples are simulated in order to conform the effectiveness and applicability of the strategy proposed in this paper.