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It describes the heteroskedasticity character of interest rate by projecting the sample data onto the EGARCH (1, 1) auxiliary model, makes making the covariance matrix as moment conditions and uses EMM to estimate the parameters. EMM avoids the disadvantage of infeasible or computationally intensive of maximum likelihood functions.

通过将观测数据映射成EGARCH(1， 1)辅助模型描述利率行为的异方差特征，以协方差矩阵为矩条件，用有效矩估计方法得出模型参数，避免了最大似然估计法似然函数不可知或难以求积分的缺陷。

Multiple sequence alignment is computationally difficult and is classified as an NP-Hard problem.

多序列比对编程实现困难。被归为 NP难题的一种。

Straightforward techniques for spatial domain digital video editing of compressed video via decompression and recompression are computationally expensive.

讨论了如何在压缩域直接将4：2：2采样结构的MPEG码流转换为4：2：0采样结构的码流。

High precision format, unstructured dynamic mesh with a large displacement and multi-species gas flows were computationally expensive, the problem of resourceless and inefficient of single computer appeared. Parallel arithmetic based on PC-Cluster system for the oblique detonation wave flow and the muzzle flow include high speed projectile were discussed. The results proved that the rationality of parallel arithmetic provided a new method to simulate the complex chemical reaction flows. The present code represents a validated, efficient and versatile tool developed for the simulation of hypersonic multi-species chemical non-equilibrium flows.

高精度计算格式、化学反应源项的刚性和大位移的运动边界处理都给计算和存储带来了沉重的负担，单机资源不足和计算时间长的问题凸现，利用PC机和局域网资源建立分布存储式并行计算系统，并基于非结构动网格和分区算法开发了复杂化学反应流场数值模拟的并行计算程序，对高速飞行实验弹丸诱导的斜爆轰波流场和含有大位移动边界的膛口燃气射流场进行了并行模拟，有效地缩短了计算时间，扩展了计算规模，为复杂化学反应流数值模拟研究提供了新的手段。

This method is computationally simple, intuitive in nature, easy to implement and with higher semantical resolution.

使用标尺法进行模糊的评分，简单、直观，计算量小，更加易于实现，并且具有更高的语义分辨度。

It is known that a production sequencing problem in mixed-model assembly line falls into NP-hard class of combinatorial optimization problem and thus a large-sized problem may be computationally intractable.

本文应用一种解大规模组合优化问题，特别是NP完全组合优化问题的有效近似算法——模拟退火算法，来求解混流生产线的投产排序问题，克服了上述缺点。

Now some problems are computationally hard, which means that they are not solvable even given infinite time.

现在，一些问题是很难计算，这就意味着他们没有解决甚至无限时间。

The development of accurate, computationally tractable methods to probe thecharacteristic of large molecules is a major goal of modern theoretical chemistry.

发展准确的、计算上易于实行的方法用于探讨大分子的性质是现代理论化学的。。。

The proposed algorithm is demonstrated by applications to be invariant to translation and scaling, is about 30 times more computationally efficient than the Fourier-based descriptors.

实际应用验证表明，该算法对轮廓特征的表述具有较好的平移、尺度不变性，且具有30倍于傅里叶描述子的运算效率。

The traditional gray-level co-occurrence matrix was computationally intensive and discriminatively insufficient.

分析了传统的灰度共生矩阵在计算纹理特征时计算量大，且分辨能力差的缺点。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。