直线度误差的计算机处理

论述了检测直线度误差时,利用计算机对检测所得的数据进行处理,代替了人工作图处理方法、这对于提高检测工作的质量和效率有较大的实用意义,可以在质检部门推广使用。     

多序列比对的两种新方法

对两种用于多序列比对的新方法——T—COFFEE和MAFFTT进行了研究,结果表明：T—COFFEE是迄今为止准确性最高的方法,但此方法速度较慢;而MAFFT则将FFT运用于比对中,使速度大大提高,并且与T—COFFEE的准确程度相当。     

道路布线与环境景观的协调配合

针对环境因素在道路线形设计中日益重要的情况,基于道路线形与景观配合设计的原则,提出了道路布线内部和谐与外部和谐相统一的思想．并进一步阐述了为达到二者和谐,在道路的平、纵线形设计,平、纵线形组合设计,道路和地形与植被的融合以及道路绿化等方面应充分考虑的若干问题．通过工程实际运用分析和道路线形透视图分析等方法,阐明了解决这些问题的有效途径．     

2株黄瓜花叶病毒卫星RNA的cDNA克隆及序列分析

在辣椒上获得2株黄瓜花叶病毒卫星RNA(CS1和CS2),通过cDNA克隆和测序并将其与35个已知的卫星RNA序列进行同源比较．结果表明,CS1和CS2的全长序列分别为336,382nt;与CS2、Rs和Yns比较,CS1从第80位起有连续30多个核苷酸的缺失．由此推测,卫星RNA的二级结构也随这些核苷酸的缺失而发生了改变．将CMV卫星RNA分为4个组,卫星RNA CS1属于中小卫星组小卫星亚组Ⅱ,CS2属于长卫星组,CS1与其他来源的卫星RNA的同源性为80．4％～93．7％,CS2与其他来源的卫星RNA的同源性则为75％～94．8％;两之间的序列同源性为86％．CMV卫星RNA的序列同源性和分组与卫星RNA分布的地区和寄主来源并无直接联系．     

蛋白质偶联分析似然算法的实现

为构建基于MATLAB语言的蛋白质统计偶联分析系统,利用子集共变显式似然(Explicit Likelihood of Subset Covaria-tion,ELSC)算法并进行实验。所实现的分析系统对GPCR多序列比对(Multiple Sequences Alignment,MSA)中的Leu-152位点进行统计偶联分析的结果和已有生物学实验结果吻合,验证了系统的正确性和实用性。     

Cytological aspects of meiotic recombination

This article reviews current views on the mechanisms of meiotic homology searching and recombination. It discusses the relationship between molecular events at meiotic prophase and concomitant cytological processes. The role of the synaptonemal complex and other meiosis-specific structures is discussed. Whereas the relationship of crossovers, late recombination nodules, and chiasmata is well established, there is still some controversy about the temporal and causal relationships between double strand breaks, homologue recognition, heteroduplexes, early nodules and presynaptic alignment.     

An approach to measuring business-IT alignment maturity via DoDAF2.0

Measuring the business-IT alignment(BITA)of an organization determines its alignment level,provides directions for further improvements,and consequently promotes the organizational performances.Due to the capabilities of enterprise architecture(EA)in interrelating different business/IT viewpoints and elements,the development of EA is superior to support BITA measurement.Extant BITA measurement literature is sparse when it concerns EA.The literature tends to explain how EA viewpoints or models correlate with BITA,without discussing where to collect and integrate EA data.To address this gap,this paper attempts to propose a specific BITA measurement process through associating a BITA maturity model with a famous EA framework:DoD Architectural Framework 2.0(DoDAF2.0).The BITA metrics in the maturity model are connected to the meta-models and models of DoDAF2.0.An illustrative ArchiSurance case is conducted to explain the measurement process.Systematically,this paper explores the process of BITA measurement from the viewpoint of EA,which helps to collect the measurement data in an organized way and analyzes the BITA level in the phase of architecture development.     

速度匹配算法在传递对准中的应用分析

理论上，载机机动对提升速度匹配传递对准滤波器的性能是有益的，但机动同时会带来较大的机翼动态挠曲变形角，这一过程对传递对准又是不利的。为了分析机动对速度匹配传递对准过程的影响，首先给出了考虑机翼柔性变形时主子惯导之间的失准角模型,并采用二阶Markov过程来表示机翼动态挠曲变形角。其次，给出了在动态挠曲变形的影响下,杆臂速度与杆臂加速度的表达式。然后，推导出了本文使用速度匹配算法的误差评估方法。最后，结合提出的相关模型,对机动条件下速度匹配算法的性能进行仿真分析。结果表明，在机翼动态挠曲变形角标准差达到20′时，滤波器出现明显的发散现象，因此速度匹配算法在应用时，应充分考虑机动带来的动态挠曲变形角所产生的影响，合理选择机动大小或武器挂点。     

Anchor-based English-Chinese Bilingual Chunk Alignment Model

Introduction Withtheincreasingdevelopmentofcorpuslinguistics,Example basedMachineTranslation(EBMT)hasbeena viabletrendinrecentyears[1,2].Thetranslationprocedure intheEBMTsystemconsistsgenerallyofthreesteps:First,asource languagesentenceisshallowlyparsedintoa sequenceofchunks;thenthebesttranslationsforthese chunksareselectedfromtheparallelchunk alignedcorpus accordingtotheircontexts;finallytheselectedtranslation chunksarecombinedintothetarget languagesentence.Thisapproachcircumventstoughpr…     

关于(n、K)—图的几个证明结果

(n、K)—图是n—连通图中一类很重要的图。本文利用Atomic序列的概念,得到了关于(n、K)—图的几个结果。