BSC和ABPA的比较:企业绩效测度的问题与特征

阐述了作为绩效测量和战略管理工具的平衡计分的问题与特点,在此基础上提出了一种基于企业要素概念的新的绩效衍生工具———基于活动的盈利能力分析;分析并评价了两种测度方法在适用范围、测量标准、与战略的关系等方面的差异.     

面向自动目标识别的图像压缩研究综述

如何使得经过有损压缩后的图像仍然保持一定的自动目标识别性能是一个非常有意义的问题。目前国外对这一问题的研究有了一定的进展,研究的内容集中在以下三个方面:(1)图像压缩对于ATR性能的影响;(2)面向ATR应用的图像质量测度;(3)面向ATR应用的图像压缩算法研究。本文针对这一问题的研究进行了较全面的综述,着重分析了几种重要算法的原理、实现和性能,并探讨了未来的研究方向。     

Accurate Representation of External Force in Time History Analysis

It is usually thought that the integration time step should be small enough to represent properly the variation of the dynamic loading with respect to time. However, there is no evaluation criterion that can be used to determine whether the external force is accurately represented. In this paper, criteria for accurate representation of external force are proposed based on analytical results. It is found that amplitude distortion both in the transient response and the steady-state response for each time step is closely related to the step discretization error of external force. In fact, for a negligible period distortion, an amplitude distortion will be less than 5% if the relative step discretization error is constrained to be less than 5% at each time step for the Newmark explicit method, Fox–Goodwin method, and linear acceleration method while for the constant average acceleration method it must be less than 2.5%. This criterion leads to the need of using of eight or more integration time steps to accurately represent a complete cycle of a harmonic loading for the Newmark explicit method, Fox–Goodwin method, and linear acceleration method while for the constant average acceleration method 12 or more integration time steps are required.     

马钢热电总厂节能技术及对策探讨

通过对马钢热电总厂的能源结构分析，探讨了马钢热电总厂节能技术的对策。     

HG-1944/24.7-PM6型锅炉大板梁的吊装

文章从吊装机械选择、布置、负荷分配及净空计算入手,到垂直度、同步性、就位三大措施,描述了该工程锅炉大板梁的吊装方案。     

变压器有载分接开关故障发现及排除

针对电力变压器有载分接开关运行中出现的故障,以太原供电分公司为例,分析有载分接开关故障原因并提出相应的排除方法。实践表明,方法的应用大大降低故障率,确保了主变压器的安全稳定运行。     

35 kV系统电压异常分析及处理

对35 kV系统电压异常现象进行归类分析,提出分析处理各种电压异常的"三要素"和处理复杂电压异常的具体措施。     

GW17-252隔离开关的机械故障及改进措施

主要论述了GW17-252户外高压隔离开关在调试和机械寿命试验中发现的机械故障,并对这些故障作了针对性的分析,实施了相应的改进措施.     

Face detection using discriminating feature analysis and Support Vector Machine

This paper presents a novel face detection method by applying discriminating feature analysis (DFA) and support vector machine (SVM). The novelty of our DFA-SVM method comes from the integration of DFA, face class modeling, and SVM for face detection. First, DFA derives a discriminating feature vector by combining the input image, its 1-D Haar wavelet representation, and its amplitude projections. While the Haar wavelets produce an effective representation for object detection, the amplitude projections capture the vertical symmetric distributions and the horizontal characteristics of human face images. Second, face class modeling estimates the probability density function of the face class and defines a distribution-based measure for face and nonface classification. The distribution-based measure thus separates the input patterns into three classes: the face class (patterns close to the face class), the nonface class (patterns far away from the face class), and the undecided class (patterns neither close to nor far away from the face class). Finally, SVM together with the distribution-based measure classifies the patterns in the undecided class into either the face class or the nonface class. Experiments using images from the MIT-CMU test sets demonstrate the feasibility of our new face detection method. In particular, when using 92 images (containing 282 faces) from the MIT-CMU test sets, our DFA-SVM method achieves 98.2% correct face detection rate with two false detections.     

CASIO fx-4800P计算器在公路施工测量中的应用

CASIO fx-4800P程序计算器可以储存多个文件名的可运行程序,储存量4500字节,在公路施工测量中应用可以大幅度提高工作效率.本文重点介绍了公路中线测量及路基边桩放样程序.