查询词典 a trace

For this purpose, this paper presents a novel clustering algorithm for these mixed data sets by modifying the common cost function, trace of the within cluster dispersion matrix. The Genetic Algorithm is used to optimize the new cost function to obtain valid clustering result.

为此，该文提出了一种基于GA的模糊聚类新算法，通过改进聚类目标函数将数值特征与类属特征相结合，从而实现具有混合属性特征数据的聚类分析；通过引入GA算法能够快速得到全局最优解，而且不依赖于原型初始化。

The forgetting factor was optimized by reducing the trace of the input error covariance matrix. This factor is able to modify the iterative learning law of control input. The error signal of the feed-forward learning controller was filtered by a zero-phase FIR digital filter.

通过减小系统输入误差协方差矩阵迹的方式得到优化的遗忘因子，来修正控制输入的迭代学习律，同时采用零相位FIR数字滤波器对前馈学习控制器中的误差信号进行滤波处理。

A practical sample testifies that the new dynamic OD estimation methodology can overcome the defect due to unsynchronized flow and better trace the variation of OD matrix.

数值算例表明，该估计模型能够有效地过滤交通流运行时间的影响，提高动态OD矩阵的估计精度，具有较强的实用性。

Considering linear and O-linear predictable variables, the author investigates optimal prediction problems by the trace of matrix. A few necessary conditions are derived and accordingly optimal linear and optimal O-linear unbiased predictors, which are unique with probabitity one, are obtained respectively by the author.

对于一类线性可预测变量和Φ-线性可预测变量，作者在矩阵迹意义下研究了一般增长曲线模型中最优预测问题，找到了其存在最优预测的几个必要条件，并在给定的条件下分别得到了最优线性无偏预测和最优Φ-线性无偏预测，而且还证明了它们在几乎处处意义下的唯一性。

The trace of a point whose direction of motion changes.

运动的方向改变的一个点的迹线。

Only we trace back to the original point can we seek the real meaning of education and find a way out,that is ,innnovative teaching.

通过回到"原点"的思考，发现创意式教学就是新形势下真正意义上的可持续发展教学，并对创意式教学的概念、特色等进行了探讨。

According to the mathematical models established with a simple and effective method,and using the computer simulation technology,the movement of mechanism can be demonstrated,and the trace of any point on the linkage can be plotted automatically.

通过一种简单有效的方法建立了数学模型，采用计算机模拟技术，能动态演示机构的运动和自动绘制连杆上任意点的轨迹曲线，并能输出各运动构件的位移图、速度图和加速度图。

We trace the jumping-of point of human being in a diverse direction of time's growth.

温馨提示：多数情况下，点击图片可浏览原大小高清效果！

To solve problems of the wheel interference and the linear speed change on grinding points which has an effeet on the grinding surface roughness,a polar-coordinate-based equal step interpolating method for the grinding point trace is presented.

为解决砂轮干涉及磨削点处线速度变化影响磨削表面粗糙度的问题，提出了极坐标下砂轮磨削点轨迹的等步长插补方法，该方法可应用于任何具有C1连续性的正则曲线的CNC磨削。

Standing in front of these oil paintings of Feng Jincao , as if we were flying through the time tunnel. Whirring wind slipped by , clouds changed their shapes quickly, and continual changing views blurred and danced before our eyes. We trace the jumping-of point of human being in a diverse direction of time's growth. Those brilliant rays of history frozen in memory reflect on our dress, and the root of our culture shows loving care for modern people's sprit and life by Feng's painting.

站在冯劲草的油画作品面前，我们仿佛正在穿越时空隧道，耳边是呼呼的风声，眼前是千层万叠的烟云和不断模糊变幻的视野，我们逆向时间轴的速度要追回人类逝去的起点，那些凝结在记忆里的历史光芒斑驳地映在我们的衣杉上，我们的文化之根正通过冯劲草特殊的油画表达方式，关怀着当代人的精神和生活。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。