乙烯装置微机优化系统

介绍乙烯装置上实现的一种计算机生产优化系统．该系统在操作经验的记忆、对比和推理的基础上对生产过程进行优化．为复杂工艺过程的优化控制提供了一条新的可行途径。     

Perceptual grouping of segmented regions in color images

Image segmentation is often the first yet important step of an image understanding system. However, general-purpose image segmentation algorithms that do not rely on specific object models still cannot produce perceptually coherent segmentation of regions at a level comparable to humans. Over-segmentation and under-segmentation have plagued the research community in spite of many significant advances in the field. Therefore, grouping of segmented region plays a significant role in bridging image segmentation and high-level image understanding. In this paper, we focused on non-purposive grouping (NPG), which is built on general expectations of a perceptually desirable segmentation as opposed to any object specific models, such that the grouping algorithm is applicable to any image understanding application. We propose a probabilistic model for the NPG problem by defining the regions as a Markov random field (MRF). A collection of energy functions is used to characterize desired single-region properties and pair-wise region properties. The single-region properties include region area, region convexity, region compactness, and color variances in one region. The pair-wise properties include color mean differences between two regions; edge strength along the shared boundary; color variance of the cross-boundary area; and contour continuity between two regions. The grouping process is implemented by a greedy method using a highest confidence first (HCF) principle. Experiments have been performed on hundreds of color photographic images to show the effectiveness of the grouping algorithm using a set of fixed parameters.     

基于DOG模型的线条检测算法

在计算机视觉领域，线条检测是图像低层次处理中一个重要的问题．文中提出一种基于双高斯差(DOG)模型的线条检测算法．分析比较了DOG检测器和高斯及高斯-拉普拉斯二阶微分检测器在线条检测方面的性能，解释了DOG函数和高斯及高斯-拉普拉斯二阶微分函数之间的关系，还给出了DOG检测器的线条检测范围并在二维空间中分析了其线条检测机理．实验中选用了指纹图像，实验结果表明DOG线条检测器能够对宽度在一定范围内的线条进行骨架提取。     

A New Grade Carbon Black Produced by Thermal Plasma Process

This paper presents a new route about producing carbon black,by wich the natural gas cracking is carried out in the absence of oxygen thanks to an electric energy supply externally given by a plasma jet.The carbon black produced by this process has a narrow size distribution and a small average diameter of 38nm as well as a highly branched aggregate.The higher DBP value of 1.40ml/g shows it should be a high structure carbon black.The FTIR spectra shows that there are lots of aromatic c-c bonds and a large amount of nitrogen-coutaining functional groups on the carbon blacks surface,such as-NH,-CN as we3ll as -CH,-OH,-COOH groups.     

视频流媒体的QoS特征分析及质量保证

网络数据传输的质量保证一般可分为空间域保证和时间域保证。空间域保证是传输数据的量的保证,取决于网络的带宽和丢失率特征;时间域的保证是对传输数据的时效性保证,取决于网络的延时和延时抖动特征。传统的数据媒体对网络传输的空间域保证有严格的要求,而没有严格的时间域保证要求。它不允许有数据丢失,但能够容忍一定的时间延时和延时抖动;而视频流媒体与此相反,它能够容忍一定的数据丢失,但要求较为严格的延时和延时抖动保证。这篇文章主要对视频流媒体数据传输的空间域特征和时间域特征进行讨论,分析其对视频流媒体的质量影响,为流媒体的网络传输QoS保证策略提供有价值的参考。     

CDM通信模型

CDM是一个嵌入式系统软硬一体化设计的计算模型,论文在CDM的基础上提出并定义了CDM的通信模型。     

DIASYS-UP系统中再热汽温控制系统的设计与调试

DIASYS UP系统是日本三菱公司生产的分散控制系统 ,在我国的一些电厂中获得应用 ,实现机组的自动控制功能。结合DIASYS UP型DCS系统的设计特点 ,详细介绍了 35 0MW机组再热汽温控制系统 ,对系统的优化运行进行了分析 ,并提出了具体、有效的调试方法     

模糊模型算法控制的永磁同步电动机位置伺服系统

提出一种模糊预测控制算法 ,它兼有模糊控制和预测控制的优点 ,对被控对象的数学模型要求不高 ,能够克服传统控制方法中由于电机参数测量不准而带来的建模困难 ,并且具有较好的鲁棒性和实时性。本文将模糊模型算法控制应用于永磁同步电动机位置伺服系统中。仿真和试验结果表明 ,模糊模型算法控制的永磁同步电机位置伺服系统具有良好的静态和动态性能     

镜面式与阻容式露点仪测试SF6气体微水时的对比及分析

通过现场的实例,说明镜面式露点仪及阻容式露点仪由于试验方法的不同,会在SF6气体存在某些杂质的情况下,使测得的露点值相差很大,从而导致由露点换算出来的SF6气体微水含最结果也相差很大.由此引发了对试验方法、监督指标、设备的安全运行等问题的讨论,并提出了一些建议.     

一种保护特性分析新方法

继电保护的实际动作行为既取决子所采用的保护原理，也与保护装置所采用的具体实现技术密切相关。本文讨论了如何利用微机故障录波数据进行保护特性分析，对保护动作情况进行检测判断的方法；系统介绍了软件的设计原则、主要功能、所采用的主要分析和计算方法以及软件的基本程序流程等。