一种改进的图像边缘检测方法

为了有效提取图像的边缘,提出一种新的基于欧氏距离图的边缘检测方法.首先计算像素间新的欧氏距离,得到欧氏距离图,新得到的欧氏距离在计算过程中强化了图像块中心像素的作用.为了消除噪声对距离图计算的影响,利用主成分分析去除图像块组中的图像块之间的相关性,从而达到降噪目的.得到的距离图能更好地突出背景与边缘信息,通过改进的水平...     

一种改进的凝聚层次聚类法

以实例说明了选用以欧氏距离或明考斯基距离为距离度量的凝聚层次聚类法进行聚类时会出现的问题,并详细分析了用该算法出现问题的原因.结合模糊聚类思想,给出了一种改进算法,通过实例说明该改进算法的合理性和有效性.     

Lab空间的改进k-means算法彩色图像分割

为减弱经典k-means 算法中ＲGB( Ｒed Green Blue) 空间各个颜色分量高度线性相关以及欧氏距离的尺度相关性对图像分割结果产生的影响,并克服ＲGB 空间色彩分布不匀的缺陷,提出了一种基于Lab 颜色空间的改进k-means 聚类彩色图像分割方法。首先,将颜色空间从ＲGB 转换为Lab 空间,每个像素点都可以由L、a、b 3 分量组合进行表示。其次,用马氏距离替换欧氏距离进行改进,应用改进后的k-means 算法对图像像素点进行聚类,从而实现分割目的。通过实验证明该改进算法比经典k-means 算法具有更好的分割效果和准确度。     

涤纶仿毛织物热湿舒适性能的评价

优良的涤纶化纤仿毛织物除应具有羊毛织物的外观及手感外，还应具有与羊毛织物相似的的舒适性．本文将涤纶化纤仿毛织物与羊毛织物的舒适性能的差异进行了比较．通过主成份分析．探讨影响两者舒适性能差异的主要因素，同时利用欧氏空间距离概念，建立评价涤纶化纤仿毛织物舒适性的客观性指标．     

非光滑约束优化的改进水平束方法

为求解一类非光滑约束凸优化问题,提出了基于Bregman距离的水平束方法,将传统欧氏距离推广到广义Bregman距离,从而可充分利用可行集的几何结构,提升计算效率。该方法利用多面体模型近似原问题的目标函数和约束函数,并引入改进函数作为最优性判别函数。最后证明了算法的全局收敛性并分析了迭代复杂度。     

工业机器人时间-冲击最优轨迹规划

提出了一种基于改进遗传算法的时间-冲击最优轨迹规划算法,所提算法采用五次多项式插值方法对轨迹规划进行连续性控制,并引入海明距离和欧氏距离对遗传算法的交叉和变异策略进行改进。仿真结果表明,所提算法性能更优,能够更好地规划出时间-冲击最优轨迹。     

工业机器人时间一冲击最优轨迹规划

提出了一种基于改进遗传算法的时间-冲击最优轨迹规划算法,所提算法采用五次多项式插值方法对轨迹规划进行连续性控制,并引入海明距离和欧氏距离对遗传算法的交叉和变异策略进行改进.仿真结果表明,所提算法性能更优,能够更好地规划出时间-冲击最优轨迹.     

AWGN信道中8-PSK TCM抗噪声性能的改进

以误差序列的欧氏重量为度量,改进了传统编码方案中自由欧氏距离的算法,并且通过简化条件译码概率的计算对V iterbi最大似然译码算法进行了优化,从而提高了系统的抗噪声性能。最后通过MATLAB仿真验证了该改进方案具有较高的渐近编码增益,使系统性能更逼近理论限。     

织物物理力学性能及其与风格关系研究的现状

织物的物理力学性能影响着织物风格的评价，并与穿用外观关联密切。研究并探讨它们之间的关联性，有助于指导织物生产者科学地设计和生产面料，有助于指导服装设计者合理地选择和使用面料。文章略述了织物风格研究的历史，回顾了织物物性的测试方法，并就织物风格研究的现状做了评述。     

K-means算法的分析及改进

研讨了数据挖掘中K-means聚类算法,在继承经典K-means算法的优点和基于最大最小距离的方法基础上实现了算法的改进,改进后的算法可根据欧氏距离度量的方法自动确定聚类中心个数K值,并能够识别数据对象中存在的孤立点和噪声,经过实验证明改进后的算法在执行效率、稳定性和K值确定方面都优于K-means算法.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that