比较函数

Comparing EMD method with traditional FFT method in the analytical process, HilbertHuang transformation is found to be superior in performance.

基于这种方法编写了非线性信号分析程序，把振动信号分解成多个本征函数，在分析过程中比较EMD方法与传统的FFT方法，通过两种方法的对比分析，体现了基于EMD的希尔伯特一黄变换的先进性。

ABSTRACT Objective The purpose of this paper is to investigate the ef fects of ametropia and anisometropia on visual development. Methods Animal models were made by binocular and monocular chronic atropinization.

用幼猫双眼或单眼慢性阿托品化的方法，造成屈光不正或屈光参差的弱视动物模型，在整个视觉发育期，连续检测其条栅视力和对比敏感度函数，并与正常幼猫相比较。

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。

Nonlinear function approximation using BP neural network and RBF neural network is simulated.

最后，作了用BP网络和RBF网络逼近非线性函数的仿真研究，并作了比较。

An example of nonlinear function approximation is given to demonstrate the effectiveness of the algorithm, where some comparisons are made with other approaches.

通过对非线性函数逼近的分析，证明了该自组织算法的有效性，并与其他算法作了比较。

This paper proposes an universal e-cash system based on partially blind signature which can be divided to small pieces of arbitrary number one time, so-called single-divisibility.

针对通用电子现金系统的难点在于其可分性，本文提出的方案以SK00系统为基础，实现其转移性(SK00公开问题)，并给商家颁发电子执照行使银行的部分职能，进而提出了一个显式可分(即一次性任意分割电子现金)的离线电子货币系统；同时利用以前的技术实现了一个采用树型结构的可分电子现金系统，并比较了这两个方案和以前方案的效率；二者安全性基于离散对数问题和强无碰撞Hash函数安全性；最后本文利用代理签名给出了一个新的部分盲签名方案。

That version takes an extra argument that is the name of a function to use to compare the elements.

这个版本需要一个额外的参数：实现元素比较的函数名字。

Optimization arithmetic of objective function is introduced to determine the optimum combination of these prediction methods.

采用了一阶指数平滑模型、神经网络模型进行聚合物驱产量的预测和比较分析；引入了目标函数的评优算法来确定前述的预测方法的最佳组合策略。

The proposed method is based on a higher order likelihood-based asymptotic procedure. The merits of the proposed method are numerically compared with the signed log-likelihood ratio statistic and the simple t-test method with respect to their expected lengths, coverage probabilities and type I errors.

我们所利用的方法是以概似函数为基础的高阶近似方法，并且我们利用模拟的方法去跟signed log-likelihood ratio及 simple t-test 两种方法比较所建构出的信赖区间的覆盖机率和平均宽度以及所对应检定的型I错误来检视我们所利用方法的优劣。

This paper consists of three parts:We first consider the non-autonomous predator-prey system with both Beddirigton-DeAngelis functional response and dispersion. By using comparison theorem of differential equation, we study the permanance of the system. After that, by constructing suitable Lyapunov function, we obtain some sufficient condition which guarantee the existence of globally asymptotically stable almost periodic solution of the system.

本文研究三方面的内容：第一部分考虑具有扩散和Beddington—DeAngelis功能反应的捕食-食饵系统，利用微分方程比较原理得到该系统一致持续生存的条件；通过构造适当的Lyapunov函数得到了该系统存在全局渐近稳定概周期解的充分条件。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。