查询词典 difficult problem

Because stock forecasting is a uncertain, nonlinear and nonstationary time series problem, it is difficult to achieve a satisfying prediction effect by traditional methods.

由于股票预测是不确定、非线性、非平稳的时间序列问题，传统的方法往往难以取得满意的预测效果。

Not only does the internet ofer abundant learning content, but also brings a series of problems. Facing the disorderly and unsystematic, tremendous amount of information, how to filtrate and conformity the knowledge being useful to self is a difficult problem.

但网络在提供了丰富的学习内容的同时却也带来了问题，面对浩如烟海杂乱无章的信息，如何快捷高效地筛选并整合对自己有利的知识变成了难题。

High precision phylliform process is rather a difficult problem at home in manufacturing industry.

高精度叶形加工在国内来讲是制造业一个较困难的课题。

To construct linear combination model, a restrained optical flow algorithm is proposed to solve the difficult problem of the pixel-wise alignments among the labeled prototypic faces.

在建立人脸线性组合模型的过程中，提出了局部约束光流算法，解决了有局部特徵信息的人脸图像稠密对应问题。

Because the model solution is one kind of NP difficult problem, we propose a new multinomial solution algorithm, and finally take online handwriting signature verification as example to confirm the mathematical model. For 150 test signatures that we choose randomly, the successful matching rate is 91.33%, the wrong reacceptance is 6% and the wrong reject rate is 2.67%.

由于模型的求解是NP困难问题，针对这种情况，提出了一种新的多项式的求解算法，以在线手写签名验证为例验证数学模型，然后对随机的150个测试签名进行检验，结果成功匹配率为91.33%，误纳率为6%，误拒率为2.67%。

The difficult problem is how to reformulate a global query into multiple sub-queries over those local data bases.

基于本体的异构信息集成中的关键问题是如何实现全局本体概念实例查询到局域信息数据查询的变换。

The research result shows that, knowledge acquisition of ES, which can acquire through the learning of ANN, is not again a difficult problem; numerical values of ANN become more definite through rehandling by ES.

以卡钻事故为例的研究结果表明，对专家系统而言，知识的获取可以通过神经网络进行学习得到；对于神经网络纯粹的数值活动，通过专家系统再处理变得更加明确。

However, the case of highly increasing business but underqualified working group in the insurance field has not changed greatly up to now. The difficult problem is that the fewness of highly qualified working group will be bound to hold back insurance restainable development.

而反观我国保险业的发展，&业务高增长、人员低素质&的现状依然没有改变，在愈演愈烈的市场竞争中，人才稀缺问题将是阻碍其可持续发展的一大难题。

In anFDD wireless system, the duplex spacing between uplink and downlink islarger than the coherence bandwidth of the mobile radio channel, thus theuplink and the downlink small-scale fading is uncorrelated. Moreover, thearray response is correlated with the frequency of the signal carrier. So it isimpossible to resue the uplink weights for downlink beamforming. As aresult, the application of smart antenna for the downlink is a difficult problem.

在频分双工系统中，由于上、下行载波的频率差大于相干频带，上、下行信道衰落是不相关的，而且阵列响应也与信号的载波频率有关，因此，上行信道不能直接用来估计下行信道，故智能天线应用于下行链路是一个难点。

Background: Sacrococcygeal chordoma presents a difficult diagnostic and therapeutic problem, with a high rate of local recurrence.

背景：骶尾部的脊索瘤在局部有很高的复发率，在诊断和治疗上都是一个难题。

Many will continue to choose to live in duality and in conflict.

许多人将继续选择活在二元对立性和冲突中。

I find that students of the University of Physical Education all wear sportswear at first sight.

我发现：体育大学的学生乍一看，都是穿运动衣，大家都一样