Improving the Estimations of VaR-GARCH Using Genetic Algorithm

1　 IntroductionIn recent years,well-publicized losses suffered by some institutions such as Natwest,Baring Bank,Metallgesellschaft,and Orange County have brought risk management tothe core of policy making and public discussion,and there has a widespread call for betterquantification of financial market risk facing regulations and financial society.At theforefront of this clamor for a standardizaed risk measure has been Value at Risk( Va R) [1～ 5] .Va R is defined as the expected loss on…     

国外鲟鱼类渔业生物学研究现状

概述了国外鲟类生理学、遗传学及生态学领域的研究现状。从微观和宏观两方面描述了国外鲟类成熟性腺、受精卵、胚胎发育、营养生理、遗传分析及生态等内容的研究结果。     

Morphological variability and genetic diversity in five species of Skeletonema （Bacillariophyta）

Twelve strains of Skeletonema from Chinese coastal waters and another strain from the West Sea of Korea were examined using light microscopy （LM）, scanning and transmission electron microscopy （SEM, TEM）, and small subunit （SSU） rDNA sequence analysis. We identified four species of Skeletonema： S. marinoi Sarno et Zingone, S. subsalsum （A.Cleve） Bethge, S. dohrnii Sarno et Kooistra, S. trop- icum Cleve, as well as a Skeletonerna-like species. These are the first records of S. rnarinoi, S. dohrnii and S. subsalsurn in China. The Skeletonema-like species, MMDLS067, was isolated from the estuary of the Changjiang River. The morphologic and phylogenetic characteristics of this species are not correspond to those of any previously published Skeletonerna species. The intercalary fultoportula pro- cesses （IFPPs） has long open tubes, and the intercalary rimoportula process （IRP） is short and located inside the rim of the IFPPs. Phylogenetic analysis revealed that MMDL5630 clustered with S. tropicurn in the NJ and MP trees, but its IRPs differed from those of previously described specimens of S. tropicum. The IRP is partially open, with an elongated opening at the base of the tube, and is longer than the IFPPs. Some specimens of S. marinoi and S. dohrnii also have longer tubular IRPs than the IFPPs. Compared to pre- viously described specimens of S. rnar＆oi and S. dohrnii, these two specimens we identified have shorter IRPs. Our results reflect the ambiguity and diversity of Skeletonema taxonomy. They are also significant for the future identification and management of red tides caused by Skeletonerna in the seas around China.     

基于遗传算法的干扰试井解释方法

提出了一种基于遗传算法（ＧｅｎｅｔｉｃＡｌｇｏｒｉｔｈｍ）的简便、高速、应用范围广的干扰试井解释新方法，并用中原油田、大庆油田的现场测试数据进行了验证．和传统方法比较，它不需要目标函数连续，不需预估初值，运算速度快、精度高．这种方法还可以推广到裂缝井、水平井等复杂情况下油藏参数辨识中．     

遗传语言中的偏好模与读码框架

评述了ＤＮＡ核苷酸关联的几种研究途径。重点研究了偏好模分析方法，讨论了它与信息参数的联系，发现了编码区偏好用Ｓ－Ｗ（强弱键）语言，而非编码区偏好用Ｒ－Ｙ（嘌呤嘧啶）语言，解释了这种区分的意义，找到了编码区常用模（＊ＷＳ）的规律性，指出这种偏好性可能与ｔ－ＲＮＡ丰度有关。研究了如何寻找读码框架及非编码区中是否存在隐蔽框架的问题。     

基于线性均方误差估值的LPC距离量度

本文从LPC系数的统计特性出发,基于线性均方误差估值的思想,提出了一种用于语音识别的新的LPC距离量度——LMSE距离.在一个IBM-PC机语音处理系统和一个VAX-11/750机语音处理系统上,做了大量孤立词识别实俭,证实了这种距离的可行性.文中还将它与著名的Itakura距离进行了比较.     

基于遗传算法和神经网络的软件界面美感建模

用户界面作为人与机器之间信息交互的桥梁,良好的用户界面能够提高人机交互的效率.本文以软件界面布局和色彩特征作为研究对象,采用神经网络方法建立特征与软件美感之间的关系模型,遗传算法进行特征选择,找出对界面美感影响较大的特征,并且通过主成分分析,最终提炼出界面美感的设计要素.     

WindowsMedia服务原理及在教学中的应用

WindowsMedia服务是Micmsoft提出的流信息播放方案，能够通过各类网络传送流式化多媒体内容，它由3个部分组成：MediaTools,Media Server和Media Player.Windows Media服务具有先进的编码技术、流技术以及媒体同步技术，对于目前正日渐兴起的远程教学提供了一种良好的解决方案。     

中国柞蚕小杏黄、鲁红和青六号品种幼虫体色基因分析(英文)

通过对鲁红、小杏黄和青六号品种杂交试验，查明了中国柞蚕幼虫体色红色、黄色、黄绿的受控基因和遗传方式．鲁红为杂合体，基因型为Ｒ／＋Ｙ／ＹＧ／Ｇ，纯合体Ｒ／ＲＹ／ＹＧ／Ｇ在卵期致死．小杏黄纯合体基因型为ｒ／ｒＹ／ＹＧ／Ｇ．青六号纯合体基因型为ｒ／ｒ＋ｒ／＋ｒＧ／Ｇ．鲁红和青六号体色有两对基因差异．基因Ｇ、Ｙ、Ｒ位于不同染色体上，基因间存在互作，Ｇ表现型为黄绿色，Ｇ、Ｙ共存表现型为黄色，Ｇ、ｒ、Ｒ共存表现型为红色     

从成本曲线谈远程教育系统的成本效益优势

对远程教育系统和传统校园面授教育系统的成本曲线进行了分析,对传统校园面授教育和远程教育的成本效益进行对比,并探讨了远程教育的成本效益优势.