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Part five discusses 3D model parametric representation, which includes 3D geometry parametrization and relative position relationship parametrization. In the former, the sweeping rules are further formalized, the concept of design parameters and modeling parameters is introduced. In the later, constraint transformation matrices of the position relationships between features are deduced, and the lost of model freedom resulted from the correspending constraint is analysed.

在特征几何参数化中，进一步规范化了特征几何的扫描生成规则，引入了设计参数和造型参数的概念，分析了造型参数向设计参数适时转化的必要性；在相对定位约束参数化中，推导了特征间一般位置约束关系的约束变换矩阵，拓宽了约束表示范围，并对约束的自由度亏损情况进行了分析。

The parametric representation, namely the feature extraction techniques, evaluated in this thesis can be divided into two groups: based on the speech production and based on the speech perception.

这些特徵粹取技术可以被分为以「语音产生方式」为主以及以「语音感知」为主两类。

It uses an unmanned air vehicle with flying-wing configuration as a test example, presents the three key elements of the approach: the parametric representation of the aircraft structural and internal layout; the model templates for structural elements; the clash check and position adjustment algorithm for internal layout.

该方法有3个关键点：(1)飞机结构布置与内部装载布置的参数化描述；(2)结构件模板的设计；(3)内部装载干涉检查和位置调整算法。

Using hybrid CSG/Brep representation, the whole solid model is a CSG tree made of leaf nodes with basic Brep, which include triangular mesh, subdivision surface control mesh and basic geometries with parametric representation.

该方法采用混合CSG/Brep表示，实体模型在整体上用CSG树表示，整个模型为基本边界表示的叶节点的组合，叶结点可以是三角网格、细分曲面控制网格或参数表示的基本几何体。

Properties of bi quadratic B spline surface are investigated by the subdivision approach, and the control mesh of bi quadratic B spline surface is constructed by employing Doo Sabin subdivision to derive the parametric representation of interpolation surface.

文中利用子分曲面理论研究双二次 B样条曲面的性质，在此基础上利用 Doo- Sabin子分模式构造插值顶点位置和法向的双二次 B样条曲面控制网格，得到插值曲面的参数表示。

We provide particular comparison results of error on an implicit and parametric surface.

我们选择隐式曲面和参数曲面做了详细的误差比较。

Chapter four and five aim at the problems of construcfion and representation of blend surface for parametric surfaces.

第四章与第五章研究的是参数曲面的过渡曲面生成问题。

Interpolation to vertex positions and normals is one of important contents in parametric surface modeling.

顶点位置和法向插值是参数曲面造型的重要内容。

To satisfy the requirement of finite element analysis, a geometry adaptive mesh generation approach is proposed for parametric surface.

为满足有限元分析的需要，针对参数曲面提出一种几何自适应的网格生成方法。

Further more, in patch based parametric surface case, we.

这里的创新点在于平衡化几何连续性条件的发现和求解。

Looking to bounce back from defeat against Cesena last weekend, the Calabrian boss will be sticking to his tried and tested 4-3-3, with Lopez and Sedivic joined up front in Giampaolo's absence by either Nanni or Plasmati.

鉴于上周末对切塞纳的比赛中反败为胜，这支南方球队将会更坚持其一贯而有效的4-3-3阵型，洛佩斯和塞德维奇将取代受伤缺席的詹保罗，和纳尼或者帕斯马蒂中的一个搭档锋线。

Meanwhile, their exposure to the more freewheeling ways of the West broadened dramatically.

另外，西方较自由的生活方式对年轻人的影响增大。