油画技法中的灰色表现

灰色对于油画具有十分重要的意义。古典罩染技法产生的“视觉灰色”可以作为研究对象，以其在油画发展过程中向直接灰色转变为研究主体，可以梳理灰颜色表现与油画发展的重要关系，透析古往今来艺术大师们对灰色的表现。梳理灰色的创作系统，引发关于灰色命题的思考。     

立井凿井设备选择布置专家系统的实现

立井凿井设备选择布置专家系统采用了分层次的数值与产生式知识表示，正向模糊推理的控制策略，有Ｖｂ和ＡｕｔｏＣＡＤ两种软件工具开发。系统的实现对井设计人员的工作有较大的帮助。     

Color appearance seen through a colored filter of various sizes

It will provide us an effective method to study the color perception of the elderly if we can employ for young subjects a pair of glasses with color property chosen to simulate that of the elderly. One problem has to be solved before using such glasses based on the concept of the recognized visual space of illumination, that is, the size of the glasses. When a piece of a white paper is seen through a yellow filter in a room, it naturally appears yellowish. But if the observer uses the filter to cover his/her eyes entirely the white paper returns to its original white; this is known as color constancy. Between these two extreme cases, the color is expected to change from yellow to white. Chromaticness and hue of an achromatic test chart of a small or large size were determined by the elementary color naming method when the chart was seen monocularly through a red, yellow, green or blue filter, respectively, placed at various distances from the eyes. Chromaticness was large at around 40% when the visual field through the filter was equal to or smaller than the test chart, but it rapidly decreased when the visual field extended over the test chart so that objects other than the test chart were included in the visual field. It decreased to almost zero when the filter was about 5 cm or less away from the eye. It was concluded that we do not necessarily have to use goggles to cover the entire visual field but can use a normal pair of glasses made of colored filters for young subjects to study the color perception of the elderly with understanding that the study is only for the color perception experienced while wearing the glasses.     

市场模拟问题的描述模型

市场模拟是一种崭新的计算机辅助市场决策的现代化管理技术，具有多学科相结合的特点２，然而实际应用中远未达到目的，本文分析了存在的问题，建立市场模拟问题的描述模型。     

Superiority of zoom lens coupling in designing a novel X-ray image detector

We design a novel X-ray image detector by lens coupling a Gd2O2S:Tb intensifying screen with a high performance low-light-level (L3,which often means luminescence less than 10-3 Lux) image intensifier.Different coupling effects on imaging performance between zoom lens and fix-focus lens are analyzed theoretically.In experiment,for designing a detector of 15-inch visual field,the system coupled by zoom lens is of 12.25-1p/cm resolution,while the one with fix-focus lens is 10 lp/cm.The superiority of zoom lens is validated.It is concluded that zoom lens preserves the image information better than fix-focus lens and improves the imaging system's performance in this design,which is referential to the design of other optical imaging systems.     

一类单参数假设检验拒绝域的直观构造法

本文提出直观法的理论 ,举出用直观法构造单参数假设检验拒绝域的应用实例 ,并得出构造形如 ( * )式的检验拒绝域的一种方法     

Visual Foxpro课程教学改革探索

Visual Foxpro作为一门数据库基础课程，在大多数高校都在开设。随着素质教育的不断推进，传统教学模式受到了很大冲击，教学改革势在必行。本文结合Visual Foxpro的教学实践，从教学模式、教学重点，实践教学等方面进行了较为全面的探讨，为Visual Foxpro课程教学提供了有益的恩路和建议。     

A modified model for dynamic properties of visual receptive field

The extended Gabor function model for visual receptive field ( RF) was modified by substituting the term related to time with two-order integral kernel of F function to generate a new model called modified Gabor function model of RF. A set of the modified Gabor models (MGM) can present the major spatiotemporal properties of neuronal receplive fields at different levels of primary visual pathway. The transient responses, dynamic properties of RF simulated by MGM, are in good agreement with the observations in electrophysiological experiments.     

Luminance and Chromaticity Conditions of a Bichromatic Cross Pattern for Chromatically-Uniform Transparency

We can perceive a surface through another surface. This perception is called transparency. It is known that transparency can be perceived even if the stimulus conditions are not consistent with physical conditions for a real transparent surface. In this study, we measured the ranges of luminance and chromaticity of the overlapping area of two crossed layers at which a surface was perceived as chromatically-uniform transparent. As the results, the luminance range of the overlapping area existed around or near the luminance of the inducing area. The upper and lower limits of the luminance range were higher for the dark background than for the light background. Moreover, the chromatic range existed around the additive colormixture line between two chromaticities of the inducing areas for both dark and light backgrounds. This indicates that the perceptual transparency mechanism would divide the color of an additive color mixture into the original colors that exist in the inducing areas. We noticed that the perceptual appearance of the stimulus changed greatly depending on the luminances of the overlapping area and the background. These differences in perceptual appearance would be a factor explaining individual difference and deciding the luminance conditions for transparency.