ffd

A study on the strengthening mechanism of the FFD system resin sand

FFD系树脂砂增强机理研究

A New FFD ( Free Form Deformation ) Method for CAGD

一种新的自由变形方法及其建模研究

Application of FFD based on subdivision surfaces in CACD system

基于细分思想的自由造型技术在CACD中的应用

Signal detection in FFD channels in wavelet domain

小波域的频率扩展信道的信号检测

Free Form Deformation ( FFD ) is one of the most important methods in computer animation and deformation .

FFD（Free-FormDeformation）是计算机动画和变形中最重要的方法之一。

Direct manipulation of FFD improves controllability and efficiency of the deformation .

FFD的直接操作为变形提供了更直观更方便的控制手段。

At last with the editing on surface , the thesis tells a FFD free distortion method .

最后结合复原曲面的编辑，讨论了曲面编辑中常用的FFD自由变形方法。

Body modeling and FFD ( Free Form Deformation ) methods are key techniques in the field of body digitalization .

人体曲面建模与自由变形方法是实现人体数字化的关键技术。

Method A non-rigid registration method of multimodal medical images based on Free Form Deformation ( FFD ) was proposed .

方法提出一种基于自由变形模型的多模态医学图像的非刚性配准的方法。

I formed the planes to follow the slopes using primitive tools such as FFD box .

我形成了飞机走斜坡发展筹资框使用原始的工具，如。

We improved FFD extrapolation operator to compensate the amplitude difference generated by geometry diffusion loss .

通过改进傅立叶有限差分的延拓算子，补偿了几何扩散损失引起的振幅误差。

Adopted the FFD heuristics and direct search method to solve large-scale respectively , and small-scale one-dimensional problem .

采用FFD启发式算法和直接搜索法分别解决大、小规模的一维排料问题。

In this positioning system , every robot has a FFD device , construct a MESH network with peer to peer topology .

在这个定位系统中，每个搜救机器人都携带有FFD设备，采用点对点的通信方式组成多跳网状网拓扑结构。

Taking into account the difference of functional needs , the FFD node and RFD node we adopt different hardware and software design .

考虑到节点功能需求，对协调器节点和精简功能节点分别采取了不同的软硬件设计方案。

The deformation of an arbitrary point in the volume space was interpolated using the movement information of the discrete mass points by FFD .

利用FFD从离散质点的运动信息插值求得体数据空间任意点的变形；

The whole process about FFD modeling system is mentioned , especially the direct manipulation of NURBS-based FFD and some classical algorithms .

对自由变形造型系统的整体过程进行了介绍，着重研究了基于NURBS的直接操纵自由变形理论，并对其中一些主要过程的经典算法进行了详细的介绍。

In this paper the free-form deformation ( FFD ) was applied to transfer deformation of the MDO procedure for turbine blades .

本文研究了一种网格变形技术&自由网格变形法（FFD）在涡轮叶片多学科设计优化（MDO）过程中的应用。

Finally , realized the local fine registration of thorax multimodal medical images by a free-form deformation ( FFD ) based on hierarchical B-splines .

为了实现胸部多模态医学图像的自动配准，提出了一种基于层次B样条自适应自由变形法和梯度下降法的配准方法。

FFD ( Free Form Deformation ) is general approach for computer facial animation and express editing while troublesomely solving control point and unconspicuous deformation result .

自由变形（FFD）是计算机人脸动画和表情编辑的常用方法，但对控制点的反求和变形结果的不直观是该方法的不足。

Free Form Deformations ( FFD ), which have been extensively investigated for computer animation and geometric modeling , constitute an important branch of the representation independent deformation methods .

自由变形（Free-FormDeformation，FFD）是与物体表示无关的变形方法的重要分支，被广泛地应用于计算机动画和几何建模领域中。

The affect of anisotropy on FFD in formation strike is larger than that in its orthonormal direction , the same is true for its value .

地层走向方向的远区场距离（FFD）受各向异性的影响程度要比其正交方向大得多，且其值同样也比正交方向大得多。

Phase-shift downward extrapolation and finite-difference downward extrapolation preserves the advantage of phase-shift method and finite-difference method . So FFD migration method is an effective scheme .

FFD算法既保持了相移法的精确性，又可以处理剧烈横向变速问题，在一定程度上克服了相移法偏移和有限差分法偏移的缺点，是一种比较有效的偏移方法。

The main idea is to design a fitness function , using group genetic algorithm combined with the BF algorithm and FFD algorithm to optimize it , and an available bin-packing result is obtained .

其主要思想是设计一种适应度函数，利用分组遗传算法结合BF算法和FFD算法来对此适应度函数进行优化，从而求得一个优化的装箱结果。

It is shown that FFD vaccine has its own superiority on heat resistance . It is worthy to carry out further work on the foam freeze drying of vaccine .

本文研究结果表明，用泡沫冷冻干燥法制得的疫苗在耐热性能上有其优越性，值得进一步深入研究。

Moreover , the Split Step Fourier ( SSF ) and Fourier Finite Difference ( FFD ) migration operators with true amplitude are derived by mathematical inference and specific steps are given .

经过数学推理，导出裂步Fourier法真振幅偏移和Fourier有限差分法真振幅偏移的算子方程，并给出其具体的实现过程。

This paper presents a set of axioms on FD , MVD and FD-MVD in terms of basic definition about FD , FFD and MVD for relational database .

本文从关系数据库关于FD，FFD及MVD的基本定义出发，讨论了FD，MVD及FD-MVD的公理系。

Numerical results show that the precision of the generalized phase screen method is better than that of SSF and can match with that of FFD while its computation amount is less than that of FFD .

数值计算表明，广义相位屏法的精度比裂步法高，与傅里叶有限差分法的精度相当，而其计算量要小于傅里叶有限差分法。

Taking computing efficiency , precision and stability into consideration , we used Pre-SDM of SSF and FFD , forward-modeling of high-order FD , CFP migration and CRS stack method .

考虑到计算效率、精度和稳定性，我们采用了SSF和FFD法叠前深度偏移、高阶差分正演模拟、CFP偏移、和CRS叠加。

The real seismic data processing proved that CFP migration has the same quality as FFD migration basically . The computing efficiency of CFP migration mainly depends on the sizes of migration aperture and computing grid .

对实际资料的试处理说明，共聚焦点偏移的效果基本达到了利用FFD法获得叠前深度偏移的效果，而其计算效率主要取决于偏移孔径和计算网格的大小。

Based on the direct manipulation of NURBS-based FFD and the constrained optimization method , a uniform model which has a uniform skeleton structure is feasible , through separating the definition of deformation control methods and the definition of deformation spaces .

在基于NURBS直接操作的自由变形的基础上，应用约束优化的方法，通过将变形控制手段和变形空间的定义相分离的思想，证明了构建一个拥有相同底层结构的统一模型的可行性。