关于逻辑函数化简的行为诊断的研究

本文以逻辑函数化简的行为诊断为研究背景，提出了一种适合于解题ＩＣＡＩ系统中学生行为的、符合人类思维特征的认识诊断系统模型，详细论述了逻辑函数化简过程中，学生行为认识诊断的具体实现，在准确捕捉学生行为中的错误及错误原因等重要问题上取得了意义的研究成果。     

第四方物流在石化企业的发展前景

通过实现企业物流的现代化来提升管理水平,获得最大的利润空间,已经越来越受到企业的关注。因此,很多企业已经把引入现代物流管理理念,建立自己的物流系统,作为降低成本,提高效益,增强市场竞争力的有效手段。结合当前石化企业物流的现状,分析第四方物流在整个供应链设计中的特点和作用,特别是在石油化工企业的发展前景。     

确定CO2最小混相压力的状态方程法

混相压力是确定油藏能否采用混相驱的重要依据,测定混相压力的最好方法是细管实验法,但室内实验法测定费时费力。基于细管实验的结果,结合“混相函数”的概念,提出了一种利用组分分割和组合的方法,即将C1^＋组分分割为几种以后,对利用修正的Redlich—kwong状态方程确定CO2最小混相压力的方法进行了研究和改进,克服了原方法中重组分临界值难以确定的缺点;同时提高了温度对计算结果的敏感性。计算结果与实验结果对比表明,确定的最小混相压力误差小于5％,充分证明该方法的有效性。     

C50引导功能的使用

Ｃ５０内部具有９Ｋ单指令周期访问的片内ＲＡＭ，在应用程序不太大的情况下，将程序在运行前由存取速度较慢的片外的ＥＰＲＯＭ读入片内ＲＡＭ，再在零等待状态下运行不失为一种方便快速的方法。本文就此进行了说明。     

A Software-Optimized Encryption Algorithm

We describe the software-efficient encryption algorithm SEAL 3.0. Computational cost on a modern 32-bit processor is about 4 clock cycles per byte of text. The cipher is a pseudorandom function family: under control of a key (first preprocessed into an internal table) it stretches a 32-bit position index into a long, pseudorandom string. This string can be used as the keystream of a Vernam cipher. Received 3 May 1996 and revised 17 September 1997     

二维随机粗糙面的fBm模拟及其统计特性

数值模拟在物理建模中具有相当重要的地位。本文基于对二维分形布朗运动（ｆＢｍ）的研究，根据ｆＢｍ的特征，阐述了用二维ｆＢｍ函数模拟随机粗糙面的方法。由于很多电磁散射问题与粗糙面的各阶矩有很大的关系，我们导出了二维随机粗糙面的统计参量与分维Ｄ的关系。基于对二维ｆＢｍ的小波分析，提出了在时－频相空间估计分维Ｄ的方法。这种方法比较简单而切实可行，不但适合于粗糙面整体分维的计算，更适合于局部分数维的计算。所     

一种新的CATV系统设计方法及CAD程序

本文分析了CATV传输系统中制约传输效率的因素,阐明了传输放大器输出电平对传输系统主要指标的关系,从而提出了最佳传输函数的概念及其机辅设计程序。     

Optimum thermoeconomic and thermodynamic performance characteristics of an irreversible three-heat-source heat pump

The coefficient of performance and specific heating load of an irreversible three-heat-source heat pump are given by using a general cycle model affected by the finite-rate heat transfer, heat leak and internal irreversibility of the cyclic working fluid. The heat pumping load divided by the total cost per unit time is taken as a new objective function and used to investigate the performance of the heat pump. The thermoeconomic and thermodynamic performance characteristics of the heat pump are discussed in detail. Some important performance parameters such as the thermoeconomic objective function and coefficient of performance are optimized. The optimally operating regions of the heat pump and the bounds of several performance parameters are determined. Finally, it is pointed out that the Carnot heat pump may be taken as a special case of a three-heat-source heat pump and consequently its optimal performance can be directly derived from the results obtained here.     

Bi-directional transmission properties of Venetian blinds: experimental assessment compared to ray-tracing calculations

An accurate evaluation of daylight distribution through advanced fenestration systems (complex glazing, solar shading systems) requires the knowledge of their Bidirectional light Transmission (Reflection) Distribution Function BT(R)DF. An innovative equipment for the experimental assessment of these bi-directional functions has been developed, based on a digital imaging detection system. An extensive set of BTDF measurements was performed with this goniophotometer on Venetian blinds presenting curved slats with a mirror coating on the upper side.In this paper, the measured data are compared with ray-tracing results achieved with a virtual copy of the device, that was constructed with a commercial ray-tracing software. The model of the blind was created by implementing the measured reflection properties of the slats coatings in the ray-tracing calculations. These comparisons represent an original and objective validation methodology for detailed bi-directional properties for a complex system; the good agreement between the two methods, yet presenting very different parameters and assessment methodologies, places reliance both on the digital-imaging detection system and calibration, and on the potentiality of a flexible calculation method combining ray-tracing simulations with simple components measurements.     

采用径向基函数神经网络的热工过程在线辨识方法

基于M-RAN算法的RBF神经网络是一种动态神经网络,适合于过程的在线建模。对M-RAN算法的删除策略进行了改进,不仅删除那些连续对网络输出贡献较小的隐层单元,同时还将相似的隐层单元合并,使网络结构更加紧凑。将基于这种算法的RBF神经网络用于电厂非性线模型热工过程的在线辨识,仿真研究表明了这种建模方法的有效性,且所得模型精度高,计算量小,可直接应用于基于模型的控制算法。图4表1参18