三维

The algorithm for calculating natural neighbour co-ordinates and their derivatives based on Lasserre's algorithm for the volume of a convex polyhedron was derived and the generalized flowchart for NEM in 3D case was presented.

文中推导了基于 Lasserre凸多面体体积公式的三维自然邻结点坐标及其导数的算法，给出了三维自然单元法算法的流程图。

In addition we establish a new moving coordinate system in the neighborhood of the wave front and obtain a revised eikonal equation describing the curvature effect of waves in the usual orthogonal coordinate system.

由此我们获得了二维和三维情形下靶型波的具体形式。对三维涡卷波和V-形波，我们也给出了它们的具体形式。在第四章，我们应用摄动方法，较简捷地获得了组织中心沿径向和轴向的运动规律。

In order to improve the measurement speed and meet the demand of dimensions of surface, shadow moire profilometry based on frequency shifting technology for measuring the BGA coplanarity is analyzed.

为了提高测量速度，满足表面外形尺寸的在线检测，针对频移阴影莫尔测量方法在BGA引脚共面度检测中的应用进行研究：(1)介绍了光学三维传感技术的概况及应用现状，简要叙述了光学三维轮廓测量技术的发展及原理。

Construct the three-dimensional manifold element covering hexahedron, provide cover displacement function, strain matrix, stiffness matrix and stress matrix of the three-dimensional manifold element by the previous research work.

6在前人研究的基础上，构造了六面体有限覆盖的三维流形单元，推导了三维流形单元覆盖位移函数、应变矩阵、刚度矩阵、荷载矩阵等表达式。

In this thesis, we implement a computational procedure to categorize and classify 3-D objects from their contour under a simple environment. First, we use foreground detection, Canny edge detection and speedy GVF snake to obtain the object's contour. The contour is then used to establish the object's features. Two databases are built using methods which compute similarity by modified aspect-combination algorithm proposed by Cyr and Kimia and new proposed aspect-combination algorithm. By using these two databases, we recognize 3-D objects using four recognition methods and compare their performance. Finally, a conclusion is made that our newly proposed algorithm is better than the modified algorithm proposed by Cyr and Kimia.

在本论文中，对一个在单纯环境下的三维物体，由撷取到辨识出此物体做了一个完整的实现，首先，利用前景侦测结合肯尼边缘侦测法和加速的梯度向量流动态轮廓侦测法，来得到物体轮廓，接著利用此轮廓找寻出物体的特徵，然后配合计算相似度的方法，代入修改后的Cyr and Kimia的外观结合演算法（aspect-combination algorithm）和新提出的外观结合演算法去建资料库，然后，对於三维物体则依据两种不同方法所建出的资料库，利用四种辨识的方法来辨识并比较其结果，最后得出新提出的外观结合演算法是优於修改后的Cyr and Kimia的外观结合演算法的结论。

In order to solve the problem of human-computer interaction in virtual assembly systems, driver classes for data glove and 3D tracker are formed, integrated with virtual assembly environment. Methods of assessing and strategies of processing raw data are given.

为了解决虚拟装配系统中的人机交互问题，结合虚拟装配环境，给出了数据手套和三维跟踪器的驱动类，阐述了数据手套和三维跟踪器的原始数据获取方法和处理策略。

The compare of reconstruction data and measurement data denominate that the reconstruction errors fall under the accepted level.

对股骨的重建结果表明，该方法对股骨的三维重建误差较小，体现了股骨的三维状况。

In consideration of cost efficiency and convenience, the dermis and subcutis could be examined simply by the 3D PPG graph derived from the proposed PPG array system. According to the amplitude of 3D PPG waveforms, the situation of skin could be evaluated that the worse skin processes the larger standard deviation of amplitude.

此外，本研究提出一套新颖的光容积阵列系统，在成本效益与方便性的考量下，透过光容积阵列所得之三维光容积讯号图，针对皮肤真皮层与皮下组织进行微循环检测，并藉由不同三维光容积变化图的振幅，可推知越差的肤质，其振幅标准差越大。

Through the studies on the local geometrical features of Tripod Operator, an approach for 3-D surface discontinuous detection is proposed at first. A Tripod Operator based description approach for free-form 3-D surface is then investigated.

并根据Tripod算子所具有的与模型无关的局部几何特性，提出一种基于Tripod算子的任意型表面整体描述方法，利用Tripod算子提取的局部特征在整个三维表面的统计特性，对三维表面进行更为简洁、准确的整体描述。

Using planar graph to express the three-dimensional objects, or a projection map to express the three-dimensional objects, must be consistent with the projection theory of descriptive geometry.

用平面图形来表达三维立体实物，或用一个投影图来表达三维立体实物，必须符合画法几何的投影理论要求。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。