查询词典 difficult problem

B. Discussed how to create the evidence model in the theory of multi-information fusion, proposed an approach to creating the evidence model by using statistical data in order to solve the problem which is difficult to get a priori probability in advance.

研究了多信息融合理论中证据模型的建立问题，并提出了一种利用统计数据建立证据模型的方法，以解决因无法得到先验概率时证据模型的建立问题。C。

The problem for America in Iraq is that it is agonisingly difficult to tell which is which.

对于在现在处于伊拉克困境中的美国来说，辨认出哪儿是哪儿实在是件非常困难的事情。

The main research of this paper is how to apply Soft-sensing Technique in the process of distilling and fermentation to solve the problem of an effluent quality parameter of the amylum rate which is usually difficult to measure.

本文主要研究如何应用软测量技术解决酿酒发酵过程中重要质量参数——淀粉利用率的难测问题。

With growth of ages, our arthrosis become ankylosis, and difficult to supple which is really a problem to the old.

随着年龄的增长，关节变得僵硬，不易弯曲。

However, the problem is very difficult, and because China's ancient architecture is not so high.

但是，这个问题非常难做，因为中国古代的建筑没有这么高的。

Chapter 5 solves the difficult degree-constrained minimum spanning tree problem by ant algorithm. Large number of tests and comparisons show the effectiveness of the searching strategy for highly constrained problem instances.

第五章对度约束最小生成树问题这个难题设计了相应的蚂蚁算法，通过大量试验求解并与其他算法作比较，发现这种蚂蚁搜索策略对于约束条件苛刻的问题实例来说，效果十分明显。

The essential problem of KBOOA are acquirement and organization of knowledge about the application domain. First of all, we recognize objects according to their outside characteristics and build stable concepts structures. In this way, the attributes and behaviors of any objects are treated as objects as well. The concepts are organized in hierarchies, the concepts' semantics are demostrated in the form of conceptual graphs. As hierarchy structure has inheritance, the system has ability to recognize and reuse concepts, analyze and reason the acquired information according to the existing knowledge, understand the problem space and present the system's functions and characteristics to the analysts and users in the form of scenarios. The main means of transforming informal requirements to formal ones is to recognize objects according to their outside characteristics, recognize attributes according to their functional dependence and describe the semantics of objects, behavior and attribute's relationship's because there is a automatic map from the descriptions of attributes and behaviors to class structures. It is difficult to transfer from OOA to OOD, We disscussed the modularity of Object-Oriented programs according to the principles of software engineering and presented the methods to decrease couplings and increase cohesions, i.

KBOOA以知识的获取、组织为中心问题，首先依据对象的外特性识别对象，并将属性和行为也作为对象处理，从而建立起较稳定的概念结构；KBOOA以层次的方法组织概念，以概念图的形式描述概念的语义，利用层次结构的继承特性，使系统具有识别、重用概念的能力，根据已有知识对系统所获信息进行分析、推理，产生对问题空间的理解，并以想定的形式向分析师、用户展示系统功能、性能，从而构成了一个交互式的，具有一定智能的需求分析环境；依据外特性识别对象，依据函数依赖关系识别属性，用概念图描述对象、行为及属性关联，是将需求由非形式化形式向形式化形式转换的主要手段，使属性及行为描述可向类型结构自动映射，为提高需求分析的自动化程度提供了依据。

Combustion control and performance evaluation for scramjets need effective measurement information, therefore it is important to choose the optimal location and number of sensors. This problem is a combinatorial optimization problem which is difficult to solve.

超燃冲压发动机的燃烧控制和性能评估需要有效的燃烧室测量信息，而如何确定传感器的最佳位置和数量是非常重要的，要求选择最小的传感器数目和最佳的测量位置来较准确的描述燃烧室工作特性，这是一个组合优化问题，直接求解比较复杂。

This problem is generally NP-hard and its deterministically equivalent problem is also difficult to be found.

这样的一个问题一般是NP-难，而且其确定性等价问题一般很难导出。

One of the most important, most difficult, and most exasperating unsolved problem s of operator theory is the problem of invariant subspaces

算子理论中最重要、最困难也最令人烦恼的未解决问题之一就是不变子空间问题。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！