查询词典 in the rough

How big is the boost from an equatorial launch? To make a rough estimate, we can

从赤道发射卫星到底能获得多大的推力呢？

Classic rough set theory based on equivalence relation takes complete system as object of study , and divides the region into some non-intersect equivalence class; But, in the real life, because of the errors in data measuring, understanding of data, or the restriction in data collection , it can make the decision-making system incomplete, that is, value of attribution of some objects is unknown, which restrains development of the theory to practical direction.

经典粗糙集理论以完备系统为研究对象，以等价关系为基础，通过等价关系将论域划分为互不相交的等价类；然而，在现实生活中，由于数据测量的误差，对数据理解或获取的限制等原因，使得在知识获取时往往面临的是不完备系统，即可能存在部分对象的一些属性值未知的情况，这就极大地限制了粗糙集理论向实用化方向发展。

To solve this problem,the equivalence relation of rough set theory is replaced by an asymmetrical similar relation,and from this relation,an asymmetrical similar matrix is defined,then a new heuristic algorithm with less space complexity that require core and knowledge reduction based on asymmetrical similar matrix is proposed,and an example is given to confirm the validity of the algorithm.

用非对称相似关系代替粗糙集理论中的等价关系，定义了非对称相似差别矩阵，提出了基于非对称相似差别矩阵的高效求核和知识约简算法。该算法无需改变初始不完备信息系统的结构，能直接处理缺省数据。实验结果表明，新算法所获得的决策规则简洁、高效，与缺省值无关。

The classic rough set theory is based on equivalence relation, but it is not able to handle the incomplete information system.

经典粗集理论以等价关系为基础，它们在处理不完备信息系统的时候存在一定的局限性。

This equivalence relation, however, seems to be a very stringent condition that may limit the application domain of the rough set model.

此外，等价关系是经典粗糙集理论中最为关键和重要的概念，然而等价关系看起来是一个过强的条件，可能会限制了粗糙集模型的应用领域。

Based on the method of similarity measure, it proves that the equivalence relation of rough set can be transformed into fuzzy equivalence matrix comp.

在这种相似性度量方法基础上，证明了粗集的等价关系可以被转化为模糊等价矩阵。

Rough set theory is developed based on the notion of equivalence relation,but the property of equivalence has limited its application fields,which may not provide a realistic description of real-world relationships between elements.

粗糙集理论是建立在等价关系的基础上发展起来的，但等价关系性质的应用领域是有限的，等价关系不能对现实世界中的元素关系给出客观的描述。

However, a rough estimate, it is so at least 12 years to recover the investment.

但是，粗略的估计，就这样至少12年收回投资。

I asked for a rough estimate but it was way off base.

我要的是近似估算，结果却完全搞错了。

This is a rough estimate of the costs.

这是对费用的大致估计。

Finally it offers the analysis of the fault-tolerance system as well as its test verification.

这样，运行于空间环境中的系统的设计目标就是在保证系统实时性

However, it is still difficult to find out the real reason of the increase of the keratinized gingiva during the orthodontic extrusion whether it is due to the proliferation of the gingival tissue or to its elastic nature, that is because the proliferation of the fibroblasts as well as the connective tissue changes in volume and the intra-fibers spaces were all immeasurable in most of the studies.

然而，仍然难以找到真正的原因增加的角化牙龈在正畸挤压它是否是由于扩散的牙龈组织或其弹性性质，这是因为增殖的成纤维细胞以及作为结缔组织的变化量和内部纤维空格都是不可估量的，大多数的研究。