Bézier曲线等分作图算法的包络性分析     

王志秦 《唐山学院学报》2004,17(4):98-101

Bézier曲线是一种最重要且最简便的构造控制参数曲线方法,是计算机图形学的重要内容。Bézier曲线的等分作图算法是一种简便、计算量小的算法;同时Bézier曲线在一些实际应用中可由包络形成因而具有包络性。本文给出了二次三次及n次Bézier曲线等分图算法的包络性证明,证明了Bézier曲线的包络性,为理解Bézier曲线的等分图算法提供了新的方式。  相似文献   

一种新型分数有理Bézier曲线     

吴蓓蓓  顾传青 《上海大学学报(英文版)》2005,9(3)

Based on rational Bézier curves given by Ron Goldman, a new fractional rational Bézier curve was first defined in terms of fractional Bernstein bases. Moreover, some basic properties were dicussed and a theorem connected to Poisson curves was obtained.Some examples in this paper were given by the visual results.  相似文献   

‘Diff‐ability’ not ‘disability’: right‐brained thinkers in a left‐brained education system     

CASEY EDMONDS 《Support for Learning》2012,27(3):129-135

This article draws on critical disability studies, challenging the exclusion of right‐brained thinkers from an education system designed to privilege left‐brained thinkers. It focuses on individuals who are labelled dyspraxic, providing data from qualitative interviews with adults about childhood experiences in school and the impact on their emotional well‐being and peer relationships. Utilising Ornstein's pioneering research on the bilateral specialisation of the brain and hemispheric dominance in addition to a critical disability studies theoretical framework, this article innovatively argues that the fact that education in England continues to be delivered in a logical sequential form, even 40 years after Ornstein's work, is systemic discrimination in which dyspraxic children are constructed as ‘deviant’. The article concludes by arguing that individuals with dyspraxia should be seen as having a ‘diff‐ability’ in thinking style rather than a disability and therefore recommends both change and awareness‐raising at institutional level in the education system.  相似文献   

Comparison with Trados and Déjà Vu     

卢甜甜 《教育教学论坛》2010,(27)

The biggest difference between Star and Trados and DéjàVu is that Star has no translation memory.When working with Trados or DéjàVu,the user will always build up the translation memory.During the translation,user can click"Set/Close Next Open/Get"in Trados translation workbench or"Add Pair to Translation Memory"in DéjàVu to send the translated sentence pair to the translation memory.In that case,translation memory is like a big storage,the more translation work the user does,the more translation units the memory has and large memory usually requires large storage space.However,Star develops a distinct function of alignment.With alignment,users can match source text and its corresponding target text as reference language pairs.This is a flexible solution of translation assistance,but it may not be as systematic as translation memory is.  相似文献   

C~2连续的有理三次Bézier样条插值曲线     

黄日朋 《滁州学院学报》2010,12(2)

有理Bézier曲线具有很多良好的性质,是曲线曲面设计的重要方法.根据给定的型值点,通过构造有理Bézier样条插值曲线的公式,给出了计算方法,并且分析了重节点情形曲线的形状和特点,最后通过数值实例验证了方法的有效性.  相似文献   

“异书同号”现象浅析   总被引：2，自引：0，他引：2  

吴玉玲 《渭南师范学院学报》2009,24(2):88-90

＂异书同号＂是图书分类中常见的现象,文章主要从多校区合并、回溯建库、有无编目细则、套书分编、编目人员失误等方面分析了＂异书同号＂现象产生的原因.指出了＂异书同号＂带来的诸多不良影响：造成书目数据库的臃肿庞大、不利于中央书目数据库的维护;藏书组织的混乱无序;检索不单一,影响读者查准率等.最后提出了防治修改措施.  相似文献   

叙词表词间关系可视化实验研究     

刘俊  李华  侯汉清  徐焕良 《大学图书馆学报》2008,26(1):61-65

叙词表已有的参照系统及几种图形显示形式在网络环境中显然不能动态地、全面地显示词间关系,不便于浏览和检索。在分析本体编辑工具Protg实现叙词表可视化的必要性基础上,以《汉语主题词表》为例,利用Protg的可视化插件TGVizTab,进行叙词表等同关系、等级关系和相关关系的可视化实验,并讨论了整部关系和例举关系的可视化。  相似文献   

列维-斯特劳斯与意识形态批评——以《聊斋志异·乐仲》为案例的分析     

陈然兴 《南阳师范学院学报》2014,(4):43-48

在列维-斯特劳斯的神话结构分析方法中存在着一条通往意识形态批评的路径。这条路径的开辟需要将结构主义分析中的逻辑张力解读为特定社会意识形态内部的矛盾,从而把结构无意识转化为意识形态斗争所造成的压抑的结果。运用这一方法解读《聊斋志异·乐仲》,可以看到,在该文本的深层结构中包含着肯定欲望与否定欲望、肯定母子血亲与肯定父子血亲两组矛盾,这两组矛盾之间存在着既是矛盾的又是可置换的关系。小说从佛教禁欲思想出发对欲望的否定在这里表现为对母子血亲关系的削弱和对父子血亲关系之权威性的巩固,它可以解读为是作者对封建伦理矛盾的一种无意识的和想象性的调和。  相似文献