查询词典 method of iteration

this paper analyses the basic principle of tpc,compares the error performance in the system which has been applied with tpc with the uncoded system,studies the influences which different block codes and iterative numbers to tpc decode performance.under the circumstances of different iteration numbers and block codes,experiment simulation is carried on.the simulation results indicate that introduction of tpc can get the code gain of 5~6 db.tpc decoding algorithm is simple,and doesn′t have the error floor,the complexity of its hardware implementation is smaller,it is a kind of practical channel coding method.

摘 要：在分析turbo 乘积码的基本编译码原理的基础上，比较了未编码与编码后系统的差错性能，研究了选取不同分量码、不同迭代次数对tpc译码性能的影响。在不同迭代次数与分量码情况下，进行了仿真实验。仿真实验表明，在相同的差错性能条件下，采用tpc码能带来5~6 db的编码增益。tpc译码算法简单，没有错误平层，硬件实现复杂度较小，是一种非常实用的信道编码方式。

The dispreading module is expressed through a bidirectional chart of a given nonlinear combination sequence. The bidirectional chart is optimized and the information data is decoded with a BP iteration method. The new system has better capability as the new system takes the interrelation between the information bits into consideration.

解扩模块通过给出非线性组合序列的双向图表达，优化双向图，用BP迭代方法来解得信息数据，由于新系统考虑了信息比特之间的相互关系，因此新系统有更好的性能。

On the basis of solute transport theory, the coal gangue eluviated in Xinqiu in Fuxin coal miming area was studied for the pollution of groundwater. The mechanism of coal gangue eluviated in the aquifer was analyzed. A coupled numerical model was developed with convection、sorption and dissolve、disintegration for simulating the leachate transport in groundwater. The model was discreted by using a Gelarkin finite-element method and a Picard iteration scheme, and the process of coal gangue leachate was presented, which predict the temporal and spatial distribution features of contaminant concentration. The result indicates that the contaminated plume is continually extended as time increases, and the vertical diffusion is more abvious.

以溶质运移理论为基础，针对阜新市新邱露天煤矿煤矸石淋滤液对地下水污染实际情况，分析了煤矸石渗滤液在含水层中运移的规律，在综合考虑对流扩散、吸附解吸、生物降解条件下建立了淋滤液在地下水中运移的耦合动力学数学模型，采用Galerkin有限元方法和Picard迭代法相结合对耦合模型进行了离散，模拟了淋溶液对地下水污染的动态过程，预测了污染浓度的时空分布特征，并结合实际观测数据进行对比。

The modal parameters of some typical structures, such as cantilever beam, stiffened plate were calculated with the iteration method.

用这种迭代算法计算了几种典型阻尼结构悬臂梁和压筋板的模态参数，计算结果与试验模态分析结果或理论解析计算的结果基本一致。

Experiments show that each iteration can be completed in 30 seconds and that the peak memory demand is 585MB during the PageRank computation of 17 million Web Pages containing 280 million links,indicating that this method meets the deman...

实验表明1 700多万的网页2.8亿条链接，可以在30秒内完成一次迭代，内存需求峰值585MB，可以满足工程化应用的需求。

5Study on vehicle-bridge coupled vibration program of multi-beams bridgeThe vehicle-bridge coupled vibration equation is detruded on the base of three axisvehicle,and the vehicle-bridge coupled vibration program is established with iteration method,which is used for analyzing the dynamic response of the assembly slab bridge.

5板桥车-桥耦合振动程序研究以三轴车辆为例建立车-桥耦合振动方程，采用分离迭代法，编制了板桥车-桥耦合振动程序，并以实例验证了其计算结果的正确性，为装配式板桥动力响应分析提供计算平台。

This new method mainly comprises three steps: firstly, normalize the point-gradient vectors and calculate the block-gradient vectors and the corresponding block-coherence; then detect the noisy areas to eliminate the side effect of noise diffusing; finally, re-estimate all block- gradient vectors based on iteration and transform the gradient field to orientation field.

提出了一种基于梯度的健壮的指纹方向场估计算法，新算法首先归一化点梯度向量并计算块梯度向量及相应的块一致性；然后估计噪声区域；最后采用基于迭代的方法，重新估计所有块梯度向量并将梯度向量场转化为方向场。

Based on the principle of Hamilton, dividing the main blade, flexbeam and torque tube into several beam elements, the bearingless rotor is nonlinearly modeled in this paper through modal transformation. By Newton-Raphson iteration and temporal finite element method, the above nonlinear equations are solved.

将无轴承旋翼的主桨叶、柔性梁和套管3个部分各自离散成若干梁单元，并将桨叶运动的物理坐标转换为挥舞、摆振、扭转方向的模态坐标，根据Hamilton原理建立旋翼气弹分析的动力学模型。

The 2D integral equations are computed by an integrated iteration algorithm of modified successive approximation method and Aitken acceleration technique.

采用改进型逐次逼近解法和Aitken加速技术相结合的迭代算法计算二维积分方程。

To compute the solution to the nonlinear equation of pressure in the Riemann problem for the pressure grdient equations, the Godunov scheme gives a reasonable approximate value for the exact solution. By using the Newton-Ruphson iteration method and some necessary computation, we get the inter-cell numerical flux directly.

为求压差方程黎曼问题中关于压力的非线性方程的解，Godunov格式给出一个合理的初始近似值，利用Newton迭代法和一些必要的计算得到格式中的数值流。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。