查询词典 hypothesis

About the problem of hypothesis testing for the problem of estimate interval,first of all,we set statistic and the distributions of the statistic.Fron this ,we derivate the methods of testing.

对于点估计问题，讨论了估计的优良性质；对于区间估计问题，讨论了估计的精度；关于参数的检验问题，首先建立检验用的统计量及其分布，由此导出检验的方法。

To explain the derivational process of the two constructions, this thesis weaves the event structure theory into the theory of Minimalist Program and proposes the biprojection hypothesis.

为解释这两种结构的派生过程，本文将事体结构理论和最简方案理论结合起来，提出了双重投射假设。

Based on the processing of the model and field data, the algorithm can evidently improve the resolution and desirably eliminate ground-roll; Moreover, the algorithm has no limitation for any hypothesis.

经过理论模型和实际资料的处理，能显著提高分辨率，对於面波的去除也很理想；此算法没有任何假设条件的约束。

This hypothesis was verified by using various spectroscopic techniques like fluorescence, circular dichroism, mass spectrometry and NMR.

为了研究此课题，我们利用了萤光光谱、原二色光谱仪、质谱仪和核磁共振仪来进行研究。

Research on animals seems to bolster this hypothesis. Retha Newbold of the National Institute of Environmental Health Sciences, a government agency in America, points to diethylstilbestrol as an example.

但是，在动物身上做的研究似乎可以支持这一假设，美国国家环境卫生科学研究所的 Retha Newbold 指出，乙烯雌酚就是一个明证。

Among used machine learning methods, the gradient descent method is widely used to train various classifiers, such as Back-propagation neural network and linear text classifier. However, the gradient descent method is easily trapped into a local minimum and slowly converges. Thus, this study presents a gradient forecasting search method based on prediction methods to enhance the performance of the gradient descent method in order to develop a more efficient and precise machine learning method for Web mining.However, a prediction method with few sample data items and precise forecasting ability is a key issue to the gradient forecasting search method. Applying statistic-based prediction methods to implement GFSM is unsuitable because they require a large number of data items to model a prediction model. In the contrast with statistic-based prediction methods, GM(1,1) grey prediction model does not need a large number of data items to build a prediction model, and it has low computational load. However, the original GM(1,1) grey prediction model uses a mathematical hypothesis and approximation to transform a continuous differential equation into a discrete difference equation in order to model a forecasting model.

其中梯度法是一个最常被使用来实现机器学习的方法之一，然而梯度法具有学习速度慢以及容易陷入局部最佳解的缺点，因此，本研究提出一个梯度预测搜寻法则(gradient forecasting search method， GFSM)来改善传统梯度法的缺点，用来提升一些以梯度学习法则为基础的分类器在资讯探勘上的效率与正确性；而一个所需资料量少、计算复杂度低且精确的预测模型是梯度预测搜寻法能否有效进行最佳解搜寻之关键因素，传统统计为基础之预测方法的缺点是需要较大量的数据进行预测，因此计算复杂度高，灰色预测模型具有建模资料少且计算复杂度低等优点，然而灰色预测理论以连续之微分方程式为基础，并且透过一些数学上的假设与近似，将连续之微分方程式转换成离散之差分方程式来对离散型资料进行建模及预测，这样的作法不尽合理，且缺乏数学理论上的完备性，因为在转换过程中已经造成建模上的误差，且建模过程仅考虑相邻的两个资料点关系，无法正确反应数列未来的变化趋势。

Although the dinosaurian hypothesis of bird origins is widely accepted, debate remains about how the ancestor of birds first learned to fly.

一个在前肢以及后肢上都有飞行羽毛的小型带羽毛恐龙化石的发现，将在古生物学界引起轩然大波。

The theoretical arguments disallow by hypothesis any impact of social structure and social relations on production, distribution, or consumption.

这些理论的探讨不接受任何关於社会结构和关系会影响生产、分配和消费的假设。

Based on results ofexperiment, it proposes the hypothesis of quasi-crystal disassociation and recrystallization in the quasi-crystal p...

解释了碱处理去原纤化及乙烯基单体接枝防原纤化的原因。

In these cases it is hard to conceive of any explanation other than infidelity on the part of the woman—a hypothesis supported by the observation that female-positive discordancy is more common in polygamous marriages, where a wife is competing for attention from her husband, than in monogamous ones.

那么，除了不贞之外很难想象任何其他理由来解释这些地区由女性导致的不一致关系率。一个现象的观察资料可以支持这个假设，女性主导的不一致关系在一夫多妻的婚姻里发生的概率高于一夫一妻的婚姻，在这种婚姻里，女性需要通过竞争才能得到丈夫的关注。

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。