查询词典 projection gradient method

In this paper, we propose a simple alternating direction method. It needs only to perform some matrix-vector productions and projection onto a simple set.

在每一步迭代中，只需要做矩阵－向量乘法和到简单集合的投影，使得算法的效率得到保证。

The problem of obtaining the dip angle of the plane figure to projection plane with Rytz Method is studied in this paper.

本文应用里茨作图法，研究由单面投影求平面图形对投影面的倾角问题

A method of right angle auxilliary projection on an arbitrary plane is provided, by which the dihedral angle can be obtained directly.

提供一种在一般位置平面上的直角辅助投射方法，直接求两面角，具有概念明确唯一，作图方法简单，可以适应钣金划线工作中制造卡角样板的实际需要。

Abstract］ Objective To evaluate the role of three-dimensional （3D） digital subtraction angiography in the diagnosis and treatment of symptomatic intracranial arterial stenosis.Methods Stent-assisted angioplasty was performed on 30 patients with symptoms of intracranial artery stenosis by 3-dimesion（3D） method.These imagings were reviewed by different locations to get information of optimal projection angle in 2D angiography.

目的 探讨三维重建技术在颅内动脉狭窄的诊断和治疗中的应用方法对使用具有三维重建功能的美国Advantx LCN+型X线血管造影机进行的30例症状性颅内动脉狭窄的患者的支架成形术进行回顾性分析。

By applying the smoothed particle hydrodynamics method to the detonation driving plate problems, a clear wave structure in the metal plate and the varying process of the projection angle were obtained.

将光滑粒子法(smoothed particle hydrodynamics method， SPH)应用于金属平板爆轰驱动过程的数值模拟，得到了炸药与金属相互作用的清晰的图像和平板抛射角的变化。

Convert relationship of prototype robot joint angle and equivalent model joint angle is presented based on the method of kinematics inverse solution. The Jacobian algorithm of redundant robot for achieving effective joint excursion is studied, which is fit for digital calculating. The grads projection algorithm of redundant robot multi optimizing capability function's proportion factor is deduced. The issues of apery arm robot singularity and joint self-movement are researched. The simulation experiment result of apery arm joint self-movement and line movement is presented.

因为七自由度拟人手臂机器人的建模比较困难，采用了在等效模型下求解其运动学逆解的方法，给出了原机器人机构关节角与等效模型关节角之间的转换关系；提出了一种适于数值计算的有效的求解有关节偏置的冗余度机器人Jacobian的算法，并在此基础上推导了冗余度机器人多优化性能指标函数的均衡比例因子梯度投影算法；研究了拟人手臂机器人的奇异问题和关节自运动问题；给出了拟人手臂进行关节自运动和进行直线轨迹跟踪的仿真实验结果。

Then, we use the pattern method to represent the cube projection on Platonic solids, Archimedean solids and Catalan solids, and observe their dynamic variations.

在第二章至第五章，我们用切割的方法做出正立方体在正多面体、阿基米德多面体、卡塔兰多面体上的投影，并观察其动态变化。

Based on the correlative constraints between vertices and straight lines on a planar object, we have proposed a new recursive method for computer interpretation of linedrawings under orthographically axonometric projection.

在建立了相关约束关系式的基础上，提出一种基于点与直线的相对位置关系递归解释线框图的新方法，主要针对的是正轴测投影线框图的计算机解释。

An improvement has been carried out on the generation method of 2D engineering drawing from 3D model in AutoCAD, and formed an intact methodology and skill of generating axonometric drawing and multi-planed orthogonal projection drawing from 3D model.

对AutoCAD中由三维模型生成二维工程图的方法进行了改进，形成由三维模型生成轴测图和多面正投影图的完整方法和技巧，这种方法所得到的轴测图和正投影图，可以对其更加方便地进行各种编辑，是一种适用的方

The simulation experiments illustrate that the method effectively improve the back projection speed.

仿真实验表明，这种方法可以有效提高反投影速度。

We have something to do in the new stage.

在这段崭新的时期中，我们有一些要做的。

The difference between tourism decision-making under uncertainty and risky tourism decision-making is indistinctive.

其中不确定性旅游决策和风险旅游决策的界线比较模糊，两者的区分是相对的。