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Like the lattice factorization, the decomposition presented here asymptotically reduces the computational complexity of the transform by a factor two.


Computational complexity of (2,2) path chromatic number problem


The algorithm exhibits either a solution or its nonexistence after at most, steps (where n is the dimension of the problem) and the computational complexity is at most1/3n3 + O(n2)


This paper studies the computational complexity of this problem for graphs with small diameters.


However, its computational complexity was comparable to that of the normalized leastmeansquare (NLMS) algorithm.

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Like the lattice factorization, the decomposition presented here asymptotically reduces the computational complexity of the transform by a factor two.


Computational complexity of (2,2) path chromatic number problem


The algorithm exhibits either a solution or its nonexistence after at most, steps (where n is the dimension of the problem) and the computational complexity is at most1/3n3 + O(n2)


This paper studies the computational complexity of this problem for graphs with small diameters.


However, its computational complexity was comparable to that of the normalized leastmeansquare (NLMS) algorithm.

 更多 


 As back propagation learning algorithm of feedforward network which has large computation complexity is prone to converge slowly and stick into local minima, two hybrid learning strategies of feedforward network, named BP&SA hybrid strategy and GA&SA hybrid strategy, which combine the supervising learning property of BP with the probabilistic jumping property of simulated annealing (SA) algorithm and combine the paralell searching property of genetic algorithms (GA) with SA are presented. As far as exclusive... As back propagation learning algorithm of feedforward network which has large computation complexity is prone to converge slowly and stick into local minima, two hybrid learning strategies of feedforward network, named BP&SA hybrid strategy and GA&SA hybrid strategy, which combine the supervising learning property of BP with the probabilistic jumping property of simulated annealing (SA) algorithm and combine the paralell searching property of genetic algorithms (GA) with SA are presented. As far as exclusive OR problem is concerned, computer simulation results by comparing with BP and improved BP algorithms show that the hybrid strategies are feasible and effective learning algorithms which greatly improve the convergence property and avoid large computation complexity to some extent.  针对前向网络反向传播算法（ＢＰ）训练缓慢和易于陷入局部极小的缺点以及反向运算的复杂性，利用ＢＰ算法监督学习特点、模拟退火（ＳＡ）算法在局部极小处的概率突跳特性和遗传算法（ＧＡ）的并行化群体搜索的特点，有效结合ＢＰ和ＳＡ算法以及ＧＡ和ＳＡ算法，提出了前向网络的两种混合学习策略即ＢＰ＆ＳＡ混合策略和ＧＡ＆ＳＡ混合策略。以异或问题为例，通过计算机仿真对混合策略与ＢＰ、改进ＢＰ算法的比较表明混合学习策略较大程度改进了前向网络学习的收敛性能和收敛速度，并一定程度上避免了反向运算的复杂性，是前向神经网络学习的有效算法。  Analysis is made on the cutterorientation capability of using the 6TPS parallel machine tool for surface machining. At first, the constraintsresult from the cutter contact interferrence and cutter edge interference, the length limit of extensible struts, the subchain interference, the angle limit of joints, the singularity configuration of the machineeffecting on the cutter orientation are analyzed, and the equations expressing these constraints are acquired. Then, the effect of the setting of the same side... Analysis is made on the cutterorientation capability of using the 6TPS parallel machine tool for surface machining. At first, the constraintsresult from the cutter contact interferrence and cutter edge interference, the length limit of extensible struts, the subchain interference, the angle limit of joints, the singularity configuration of the machineeffecting on the cutter orientation are analyzed, and the equations expressing these constraints are acquired. Then, the effect of the setting of the same side joints on two adjacent subchains on the calculation of subchain interference test is investigated, and the formulas to determine the distance between the same side joints are derived aiming to reduce the calculation complexity. Based on the obtained equations, an efficient algorithm to calculate the allowable value region of the cutterorientation angle for surface machining using the 6TPS parallel machine tool with the flat cutter is presented. The algorithm can be used to control the orientation of the cutter so as to avoid overcutting in surface machining.  为了研究6TPS并联机床曲面加工的刀具姿态能力问题,首先对刀具的切触干涉、外缘干涉以及机床支链杆长极限、支链干涉、铰链约束和奇异位形对刀具姿态的制约进行了分析,得到了相应的约束表达式;其次分析了相邻支链同侧铰链点的布位对支链干涉检验计算量的影响,并从降低运算复杂性的角度提出了确定同侧铰链点间的距离公式.基于得到的约束表达式及距离公式,给出了确定6TPS并联机床采用平底刀加工曲面时刀具姿态角许用取值域的有效算法.该算法可用于曲面加工过程中的刀具姿态控制,以避免曲面的过切现象.  Due to the physical structure of singlechip CCD or CMOS color image sensor, there is only a single color component at each pixel position. As a result, color interpolation or color demosaicing is required to reconstruct the other two color components. General linear interpolation method may blur the image edge, and introduce color artifacts near edges. Although stateofart methods may increase image quality, the computational complexity limits their applications. This paper presents a novel color interpolation... Due to the physical structure of singlechip CCD or CMOS color image sensor, there is only a single color component at each pixel position. As a result, color interpolation or color demosaicing is required to reconstruct the other two color components. General linear interpolation method may blur the image edge, and introduce color artifacts near edges. Although stateofart methods may increase image quality, the computational complexity limits their applications. This paper presents a novel color interpolation method. It effectively increases the quality of interpolated images in three ways. At first, it performs interpolation in color difference space rather then in normal color space. Secondly, it introduces Rational Functions (RF) based operator instead of linear operator. And at last, a postprocessing step is employed further to enhance the image quality. Because interpolation in color difference space takes into account the correlations between each color components, and RF based operator is edgeadaptive, this is the reason why the image quality can be improved using this method. In addition, this method is simple and calculating efficient in contrast to some of the stateofart methods. The experiments compare PSNR and PESNR as while as MSE with the other three methods at the end of this paper.  由于物理结构的限制 ,单片 CCD和 CMOS彩色图象传感器在每个像素的位置上只能采集一个颜色分量 ,其余两个颜色分量只能通过插值的办法得到 .鉴于通常的线性插值方法容易使图象的边缘变得模糊 ,并可能出现较为明显的颜色失真 ,而一些新方法尽管可以得到较高质量的插值图象 ,然而运算的复杂性限制了它们的应用 .为此提出了一种在色差空间进行插值的算法 ,以代替普通颜色空间的插值 ,同时用基于有理函数的插值算子来代替普通的线性算子 ,并通过后处理来进一步提高插值图象的质量 .由于色差空间的插值考虑了不同颜色分量间的耦合性 ,并利用了有理函数插值算子固有的边缘自适应特性 ,因而得到了较好的效果 .该方法另外的一个优点是计算速度较快 .实验结果表明 ,该该算法是有效的 .   << 更多相关文摘 
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