浅谈企业应收帐款的成本管理

针对有些单位单纯依靠赊销手段开拓市场,导致应收帐款不断增加的现象,分析了应收帐款的占用成本构成内容和确定应收帐款的最佳水平一般标准,指出企业应建立赊销风险责任制和风险预警机制并应选择好银行结算方式以加强应收帐款的成本管理。     

探索有效的培训方式,促进企业发展

通过培训达到提高职工队伍整体素质的目的,采用的培训形式有两种,一是因地制宜,立足企业内部力量进行培训;二是突出重点,"走出去,请进来",拓宽培训渠道.     

基于数据仓库的综合决策支持系统的设计研究

侧重介绍了数据仓库、OLAP和模型库的设计,该系统采用了OLAP、DSS模型库等多项新的技术和模型,有机地集成了多个子系统,经武钢等单位实际应用,证明充分利用了前期开发的多个信息系统中的数据源,可不断增加新模型和新知识以适应更多决策主题的需要,使模型的参数“自适应”成为事实。     

Using categorical methods in computer science

Some categorical methods used in developing computer programs are considered. Relevant theorems are proved. Translated from Kibernetika i Sistemnyi Analiz, No. 4, pp. 3–11, July–August, 2000.     

安全可靠无线测控数据传输研究

有线数据传输广泛应用于各个领域,然而有些领域或场景却不便于应用有线数据传输,在这里无线数据传输有其特殊的用途。本文就单片机无线数据传输系统的可靠性、安全性等方面进行了研究,提出了无线数据传输的关键技术。通过无线数据传输应用于测控过程的实例证明,其结果是可靠、安全的,从而为特殊领域的数据传输开辟了新的途径。     

An approximate compositional approach to the analysis of fluid queue networks

Fluid models have for some time been used to approximate stochastic networks with discrete state. These range from traditional ‘heavy traffic’ approximations to the recent advances in bio-chemical system models. Here we present a simple approximate compositional method for analysing a network of fluid queues with Markov-modulated input processes at equilibrium. The idea is to approximate the on/off process at the output of a queue by an n-state Markov chain that modulates its rate. This chain is parameterised by matching the moments of the resulting process with those of the busy period distribution of the queue. This process is then used, in turn, as a separate Markov-modulated on/off process that feeds downstream queue(s). The moments of the busy period are derived from an exact analytical model. Approximation using two- and three-state intermediate Markov processes are validated with respect to an exact model of a tandem pair of fluid queues — a generalisation of the single queue model. The analytical models used are rather simpler and more accessible, albeit less general, than previously published models, and are also included. The approximation method is applied to various fluid queue networks and the results are validated with respect to simulation. The results show the three-state model to yield excellent approximations for mean fluid levels, even under high load.     

Learning independent components on the orthogonal group of matrices by retractions

Neural independent component learning algorithms based on optimization on manifolds have attracted interest in the neural network community. In the past years, we have developed learning algorithms specialized for the orthogonal group of matrices as parameters manifold. Here, we sketch a view of these algorithms by the help of ‘retractions’ on manifolds.     

基于直接转矩控制的风轮模拟仿真研究

基于直接转矩控制理论分析和永磁同步电机直接转矩控制结构原理,借助MatLab/SimuLink工具,对永磁同步电机直接转矩控制系统各环节进行了仿真建模;基于直接转矩控制快速动态响应的特点,成功应用该控制系统进行风轮模拟仿真实验,获得了理想的风力特性输出曲线,验证了理论的正确性。     

基于干燥减量法水分检测仪的研制

干燥减量法是经典的水分测量方法,它通过测量样品在干燥前和干燥后的质量变化来计算样品的水分含量。本文介绍了基于干燥减量法水分检测仪的研制,分析了水分检测仪两个重要组成部分：温度控制模块和重量检测模块的组成和工作原理,详细介绍了水分检测的工作过程,并给出了系统的结构框图和程序流程图。     

基于数字图像处理的地震波初至时间检测

地震波初至时间的检测是地震信号处理中的一个重要环节.在地震波接收记录上,初至波振幅大于噪声振幅,初至时间位于纯噪声信号与地震有效信号和噪声之叠加信号之间的分界处.根据这些特征,本文把地震信号幅值数据处理成256级灰度图,再把灰度图二值化,然后通过检测二值图像的边缘,获得地震波的初至时刻.对于存在较多的连续异常记录道,或其它强干扰信号的地震波记录,提出了二次或多次用不同阈值对图像进行二值化的检测方法.对实际地震记录的处理表明,本文方法具有较高的精度和效率.