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Search Results: 1 - 10 of 150523 matches for " 华平? "
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基于变分水平集方法的散乱数据曲面重构研究
Surface Reconstruction from Scattered Data Based on Variational Level Set Method
 [PDF]

朱云云,
Journal of Image and Signal Processing (JISP) , 2016, DOI: 10.12677/JISP.2016.52007
Abstract:
工程学和医学等领域中的很多问题进行抽象后可转化为散乱数据的光滑曲面重构问题。在散乱数据附近设定初始轮廓,将初始轮廓间接地表示为水平集函数的零水平集形式,最终将初始活动轮廓的演化转化成水平集函数的演化。定义一个以水平集函数为自变量的能量泛函来度量它与散乱点的逼近程度,利用改进的变分水平集方法演化初始轮廓,达到重构目的。本文中,一是对Heaviside函数进行改进,使初始轮廓能更好的收敛于目标轮廓;二是给出了模型数值计算的具体过程,并以二维实例说明散乱数据重构的效果。
A lot of problems in the field of engineering and medicine after abstraction can be converted into scattered data reconfiguration problems. We set initial contour near the scattered data, expressed as the zero level set of the level set function, which will eventually turn the evolution of initial active contour into the evolution of the level set function. We define an energy functional who takes the level set function as its independent variable, to measure approximation degree with the scattered data, and use the improved variational level set method to evolve the initial contour and achieve reconstruction. In this paper, firstly, putting forward an improved Heaviside function to make the initial contour can better converge in the target contour; secondly, the specific process of numerical calculation model is given, and a two-dimensional example illustrates the effect of the scattered data reconstruction.
拓扑空间偶范畴中的同伦正则态射
On Homotopy Regular Morphism in the Category of Topological Pairs
 [PDF]

钱有, , 陈胜敏
Pure Mathematics (PM) , 2013, DOI: 10.12677/PM.2013.31004
Abstract:
本文将点标拓扑空间范畴中的同伦单、同伦满和同伦正则态射等概念推广到拓扑空间偶范畴的情形。研究了在中,同伦正则态射存在的条件、性质以及它与同伦单()态和同伦等价之间的关系。
In this paper, the concepts of homotopy monomorphism (epimorphism) and homotopy regular morphism in the category of topological space with base point are generalized to the category of topological pairs . The paper studies the conditions and properties of homotopy regular morphism and the relationships between homotopy monomorphism (epimorphism) and homotopy equivalent morphism in .
以对轮图为缩影图式流形的同胚类数
The Homeomorphic Class number of Graphlike Manifold with Contraction Round Diagrams
 [PDF]

, 陈胜敏, 钱有
Pure Mathematics (PM) , 2012, DOI: 10.12677/PM.2012.23018
Abstract: 对于某些自然数n,通过分类法可以得出以对轮图Wn 为缩影的所有图式流形Wn*的同胚类的类数,并且用Matlab软件算出Wn*中每个图式流形的伴随矩阵的不同特征多项式个数,得出Wn*同胚类数的下界。对于所有的自然数n,利用Burnside引理给出了求Wn*的同胚类数的上界的一个方法。
This article obtains the number of homeomorphic class of Wn*  by means
师范院校大学生专业承诺、学习倦怠的状况及其关系分析
A Study on the Professional Commitment and Learning Burnout of Undergraduates in Normal School
 [PDF]

杨青青,, 李娟
Advances in Psychology (AP) , 2016, DOI: 10.12677/AP.2016.69128
Abstract:
为了了解当前师范院校大学生积极和消极的学习心理状况,采用量表法对对157名的大学生进行了专业承诺和学习倦怠的状况及其关系的研究。结果表明,(1) 专业承诺水平均于中间值,情感承诺、规范承诺、继续承诺的水平高于理想承诺。学习倦怠水平较高,主要表现在行为不当因子上。(2) 男生的情感承诺和理想承诺显著高于女生。男生行为不当显著低于女生;(3) 大一的理想承诺显著高于大四的同学,大三学生在情绪低落显著低于大一大二学生;大一低成就感显著高于大二、大四,大二低成就感显著高于大三;(4) 文科学生的情绪低落、行为不当、低成就感显著低于理科学生。(5) 师范类型的学生在情绪低落、低成就感上显著高于非师范类学生,师范类的在情感承诺和理想承诺上均显著低于非师范类学生。(6) 情感承诺是当前大学生学习倦怠的最重要的预测变量,说明大学生对专业的理性认识不够。
To have a better understanding of the positive and negative learning psychology of current un-dergraduates, scales were used to study the professional commitment and learning burnout of 170 under graduates of different sexes, grades, majors. The research shows that undergraduates, specialty commitment level is not high, while their learning burnout level is comparatively high. In terms of gender difference, male students are higher than females at the level of affective com-mitment and ideal commitment, while female students are lower than males at the level of achievement sense. In terms of grades, freshmen are higher than seniors at the level of ideal com-mitment; freshmen and sophomores are higher than juniors at the level of the general burnout; freshman are higher than sophomores and seniors at the level of reduced personal accomplishment. In terms of majors, behavior inadequacy, the general burnout and reduced personal accom-plishment level of students of liberal arts is higher than science. As far as the types of major are concerned, the specialty commitment and the affective commitment level of normal students are lower than those of non-normal students, while their behavior inadequacy, the general burnout and reduced personal accomplishment level are higher than those of non-normal students. The affective commitment level is the most effective forecasting factor in measuring the burnout level of undergraduates.
物元分析在产品评价中的应用

系统工程理论与实践 , 1990,
Abstract: 本文根据物元分析理论并结合产品评价要素的特点建立关联函数,为产品评价提供一个简便实用的数学模型及对产品评价选择的方法。
Deep Editing Process in Sci-tech Journals
科技编辑工作中的深度编辑加工


中国科技期刊研究 , 2002,
Abstract: 依据编辑加工的深浅和粗细,把编辑加工分为浅层加工和深度加工两个不同的加工层面。并对深度编辑加工的内涵作了阐述,论述了深度编辑加工的具体内容和需要的技术和方法的支持。
西藏“一江两河”流域中部地区草地资源特点

自然资源学报 , 1994,
Abstract: (西藏“一江两河”流域中部地区是自治区工农业经济最集中发达的地区,畜牧业生产在本区农业经济中占有一定的比重。本文阐述了本区草地的资源状况,生产力特点及草地的分布规律。研究发现:本区草地面积525.4万ha,草地类型较复杂,垂直分布明显,牧草组成较丰富,营养价值较高。但草地生产力水平较低,平均产草量为1275-1350kg/ha。从草地资源的水平分布格局看,存在着明显的南北差异,雅鲁藏布江以北占63%以上。从时间分布看,存在着明显的季节性差异,其冬季的草地现存量仅为秋季的10-30%,但本区饲草饲料构成、分布格局与畜牧业生产是相协调的,构成了一个相对匹配的草地畜牧业整体。
川东高海拔山区红三叶,红三叶—鸭茅和红三叶—黑麦草人工群落生物量的比较…

自然资源学报 , 1994,
Abstract:
西藏山南地区河谷五县饲草资源及其利用

资源科学 , 1991,
Abstract: 山南地区的贡嘎、扎朗、乃东、琼结和桑日五县位于雅鲁藏布江中游宽谷河段,为一相对独立的高寒河谷盆地单元,面积为1.02万km~2。雅鲁藏布江由西至东贯穿本区。河谷底部海拔高3500—3600m。平均宽5km,河道平缓、汊流发育,河漫滩分布广泛,在谷缘山麓普遍发育有洪积扇;在宽谷中还出现了大量风沙堆积,在恒定风长期作用下,沙丘呈新月形。河谷南北两侧的山地海拔高一般在5000—5500m,积雪甚少,无现代冰川发育。气候温暖干燥,河谷年平均气温6—8.5℃,最热月均温15℃左右,≥10℃积温在1800—2200℃之间,无霜期120—150d,
共享存储并行处理系统中的自适应同步路障算法

计算机科学 , 1998,
Abstract: 在井行程序设计中,如何有效地协调各进程(子任务)之间的并行计算是直接影响整个系统执行性能的一个主要因素~1,2]。在许多基于共享存储器模型
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