检索结果-内蒙古大学图书馆

Generation, recognition and recoding of 64-chip bipolar optical code sequences using superstructured fibre Bragg gratings

引用

ELECTRONICS LETTERS 2001年第3期37卷 190-191页

作者： Teh, PC Petropoulos, P Ibsen, M Richardson, DJ Univ Southampton Optoelect Res Ctr Southampton SO17 1BJ Hants England

The generation, recognition and subsequent recoding of ac:hip. 160Gchip/s bipolar optical codes using superstructured fibre Bragg gratings is demonstrated. The results represent an eightfold increase in code length re... 详细信息

关键词： optical code code length coding sequence Fiber Bragg gratings ambipolar

来源：评论

学校读者我要写书评

暂无评论

NEW TERNARY LINE CODES BASED ON TRELLIS STRUCTURE

引用

IEEE TRANSACTIONS ON COMMUNICATIONS 1993年第6期41卷 864-873页

作者： AYGOLU, U PANAYIRCI, E NEW JERSEY INST TECHNOL DEPT ELECT & COMP ENGNCTR COMMUN & SIGNAL PROCNEWARKNJ 07102

The trellis coding technique is applied to line-coded baseband digital transmission systems. For R = n/n + 1(n = 1, 2, 3) coding rates, a new codeword assignment model is proposed to accomplish basic requirements for line coding in which each length n binary data sequence is encoded into a length n + 1 ternary (+, 0, -) line codeword chosen among the code alphabet with 2n+2 elements. Assuming Viterbi decoding, the system error performance is improved by increasing the free Euclidean distance between coded sequences. A new algorithm is given for the calculation of the free distance between line-coded sequences so obtained. For R = 1/2 and R = 3/4 rates, the analytical error performance upper bounds are derived. The power spectral densities of the new line codes are also calculated and compared with those of known line codes.

关键词： codeword line code Codes Digital transmission systems Ternary Trellis codes GPR17 protein, human Euclidean distance error performance coding sequence

来源：评论

学校读者我要写书评

暂无评论

ANALYSIS OF A DIRECT-sequence CDMA MOBILE RADIO SYSTEM WITH REDUCED SET OF CODE sequenceS

引用

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 1995年第3期44卷 525-534页

作者： KIM, DI Department of Electronics Engineering Seoul City University Seoul South Korea

A code-division multiple-access scheme that requires a reduced set of code sequences, in which the size of the set is much less than the number of users in the system, is proposed for mobile radio communications, A direct-sequence spread-spectrum signaling is adopted to exploit the property of high time resolution and combat fading effects through multipath diversity reception. Theoretical performance of the proposed system is analyzed by deriving the collision-free path distribution and determining the proper size of the set without reducing the effect of multipath diversity, In connection with the proposed system, two combining schemes are investigated to characterize the effects of the primary and secondary user interferences and evaluate the behavior of the error rate when compared to the original CDMA system.

关键词： code division multiple access diversity reception fading land mobile radio multipath channels pseudonoise codes radiofrequency interference spread spectrum communication code sequences collision-free path distribution direct-sequence CDMA mobile radio sy Error analysis Codes coding sequence Code division multiple access pseudonoise codes Spread spectrum communication diversity reception fading color land mobile radio Direct-sequence code-division multiple access Mobile radio systems Radiofrequency interference Multipath channels

来源：评论

学校读者我要写书评

暂无评论

PN-curve: A 3D graphical representation of DNA sequences and their numerical characterization

引用

CHEMICAL PHYSICS LETTERS 2007年第4-6期442卷 434-440页

作者： Qi, Zhao-Hui Fan, Tong-Rang Shijiazhuang Railway Inst Dept Comp & Informat Engn Shijiazhuang 050043 Hebei Peoples R China

We consider a novel 3D graphical representation of DNA sequences based on the pairs of nucleotides (PNs). The model avoids loss of information accompanying alternative 3D representations in which the curve standing for DNA sequence overlaps or intersects itself. The utility of the method can be illustrated by the examination of similarities/dissimilarities among the complete coding sequence part of beta globin gene of several different species. (c) 2007 Elsevier B.V. All rights reserved.

关键词： SIMILARITY/DISSIMILARITY SIMILARITY BASES Three Dimensions information loss coding sequence beta-Globins DNA sequence

来源：评论

学校读者我要写书评

暂无评论

FREQUENCY-HOPPING CODE sequence DESIGNS HAVING LARGE LINEAR SPAN

引用

IEEE TRANSACTIONS ON INFORMATION THEORY 1988年第1期34卷 146-151页

作者： KUMAR, PV NTT Media Intelligence Laboratories Tokyo Japan

In frequency-hopping spread-spectrum multiple-access communication systems, it is desirable to use sets of hopping patterns that, in addition to having good Hamming correlation properties and large period, are also derived from sequences having large linear span. Here, two such frequency hopping code sequence designs that are based on generalized bent functions and generalized bent sequences are presented. The Hamming correlation properties of the designs are optimal in the first case and close to optimal in the second. In terms of the alphabet size p (required to be prime in both cases), the period and family size of the two designs are given by (p/sup 2/, p) and (p/sup n/, p/sup n/2/+1) (n an even integer), respectively. The finite field sequences underlying the patterns in the first design have linear span exceeding p, whereas still larger linear spans (when compared to the sequence period) can be obtained using the second design method.

关键词： Optimal Family Size Agrostis Linear Long spans frequency hopping spread spectrum Prime multiple access communications coding sequence two-phase design Frequency hopping sequences

来源：评论

学校读者我要写书评

暂无评论

Hidden Markov Model for Splicing Junction Sites Identification in DNA sequences

引用

CURRENT BIOINFORMATICS 2013年第3期8卷 369-379页

作者： Maji, Srabanti Garg, Deepak Thapar Univ Dept Comp Sci & Engn Patiala 147004 Punjab India

Identification of coding sequence from genomic DNA sequence is the major step in pursuit of gene identification. In the eukaryotic organism, gene structure consists of promoter, intron, start codon, exons and stop codon, etc. and to identify it, accurate labeling of the mentioned segments is necessary. Splice site is the 'separation' between exons and introns, the predicted accuracy of which is lower than 90% (in general) though the sequences adjacent to the splice sites have a high conservation. As the accuracy of splice site recognition has not yet been satisfactory (adequate), therefore, much attention has been paid to improve the prediction accuracy and improvement in the algorithms used is very essential element. In this manuscript, Hidden Markov Model (HMM) based splice sites predictor is developed and trained using Modified Expectation Maximization (MEM) algorithm. A 12 fold cross validation technique is also applied to check the reproducibility of the results obtained and to further increase the prediction accuracy. The proposed system can able to achieve the accuracy of 98% of true donor site and 93% for true acceptor site in the standard DNA (nucleotide) sequence.

关键词： Algorithms coding sequence cross validation gene finding hidden markov model modified expectation maximization (MEM) splice site

来源：评论

学校读者我要写书评

暂无评论

ORGANIZATION AND CHROMOSOMAL LOCATIONS OF RAP1A/KREV sequenceS IN THE MOUSE

引用

MAMMALIAN GENOME 1992年第3期3卷 162-167页

作者： DOWER, NA SELDIN, MF PUGH, S STONE, JC UNIV ALBERTA DEPT PAEDIATEDMONTON T6G 2E1ALBERTACANADA DUKE UNIV MED CTRDEPT MEDDURHAMNC 27710 DUKE UNIV MED CTRDEPT MICROBIOLDURHAMNC 27710 UNIV ALBERTA DEPT BIOCHEMEDMONTON T6G 2E1ALBERTACANADA

The human RAP1A gene encodes a protein that apparently can antagonize the function of oncogenic ras genes in gene transfer experiments, but its normal function is unknown. To understand the function of this gene, we have undertaken a study of the mouse homolog, Rap1a. The complete coding sequence of a mouse Rap1a cDNA has been determined, and genomic clones representing three distinct Rap1a species were recovered. We find that Rap1a is located on distal mouse Chromosome (Chr) 3 near Nras, Ampd-1, Tshb, Ngfb, and Atp1a1. Two related sequences (Rap1a-rs1 and Rap1a-rs2) were also characterized. Rap1a-rs1, which was not localized, has a sequence very similar to the Rap1a cDNA, suggesting that it has been recently acquired by the mouse genome. Rap1a-rs2 is more distantly related to the gene sequence and is located on Chr 2 near Actc-1.

关键词： Organizations Chromosomes Molecular cloning Gene transfer Mouse sequences Gene function normal function Transgenes Mus Base sequence coding sequence Function

来源：评论

学校读者我要写书评

暂无评论

The exon 13 duplication in the BRCA1 gene is a founder mutation present in geographically diverse populations

引用

AMERICAN JOURNAL OF HUMAN GENETICS 2000年第1期67卷 207-212页

作者： Mazoyer, S Leary, J Kirk, J Fleischmann, E Wagner, T Claes, K Messiaen, L Foulkes, W Desrochers, M Simard, J Phelan, CM Kwan, E Narod, SA Vahteristo, P Nevanlinna, H Durando, X Bignon, YJ Peyrat, JP Bonnardel, C Sinilnikova, OM Puget, N Lenoir, GM Mazoyer, S Audoynaud, C Goldgar, D Maugard, C Caux, V Gad, S Stoppa-Lyonnet, D Noguès, C Lidereau, R Machavoine, C Bressac-de Paillerets, B Kuschel, B Betz, B Niederacher, D Beckmann, MW Hamann, U Gayther, SA Ponder, BAP Robinson, M Taylor, GR Bishop, T Catteau, A Solomon, E Cohen, B Steel, M Collins, N Stratton, M van der Looij, M Oláh, E Miller, NJ Barton, DE Sverdlov, RS Friedman, E Radice, P Montagna, M Sensi, E Caligo, M van Eijk, R Devilee, P van der Luijt, R Heimdal, K Moller, P Borg, Å Diez, O Cortes, J Domenech, M Baiget, M Osorio, A Benítez, J Borg, Å Maillet, P Sappino, AP Özdag, H Özçelik, T Ozturk, M Rohlfs, EM Boyd, J McDermott, D Offit, K Unger, M Nathanson, K Weber, BL Sellers, TA Hampton, E Couch, FJ Neuhausen, S Fac Med UMR CNRS UCBL 5641 F-69373 Lyon 08 France

Recently a 6-kb duplication of exon 13, which creates a frameshift in the coding sequence of the BRCA1 gene, has been described in three unrelated U.S. families of European ancestry and in one Portuguese family. Here, our goal was to estimate the frequency and geographic diversity of carriers of this duplication. To do this, a collaborative screening study was set up that involved 39 institutions from 19 countries and included 3,580 unrelated individuals with a family history of the disease and 934 early-onset breast and/or ovarian cancer cases. A total of 11 additional families carrying this mutation were identified in Australia (1), Belgium (1), Canada (1), Great Britain (6), and the United States (2). Haplotyping showed that they are likely to derive from a common ancestor, possibly of northern British origin. Our results demonstrate that it is strongly advisable, for laboratories carrying out screening either in English-speaking countries or in countries with historical links with Britain, to include within their BRCA1 screening protocols the polymerase chain reaction-based assay described in this report.

关键词： .mainly Breast Cancer rearrangements carriers carrying unrelated ancestor coding sequence Great Britain Founder Mutation Exon Duplication BRCA Gene BRCA Exon Duplication Screening breast and/or ovarian English-speaking countries

来源：评论

学校读者我要写书评

暂无评论

THE COMPLETE DERIVED AMINO-ACID-sequence OF HUMAN LYSYL OXIDASE AND ASSIGNMENT OF THE GENE TO CHROMOSOME-5 - (EXTENSIVE sequence HOMOLOGY WITH THE MURINE RAS RECISION GENE)

引用

MATRIX 1992年第3期12卷 242-248页

作者： MARIANI, TJ TRACKMAN, PC KAGAN, HM EDDY, RL SHOWS, TB BOYD, CD DEAK, SB BOSTON UNIV SCH MEDDEPT BIOCHEMBOSTONMA 02118 ROSWELL PK CANC INST DEPT HUMAN GENETBUFFALONY 14263

Lysyl oxidase catalyzes the oxidation of lysine residues to alpha-aminoadipic-delta-semialdehyde. This is the first step in the covalent cross-linking of collagen and tropoelastin and results in the formation of insoluble collagen and elastic fibers in the extracellular matrix. We have characterized the complete nucleotide sequence of human lysyl oxidase (EC 1.4.3.13) and compared the derived amino acid sequence (417-amino acids) to rat lysyl oxidase and the mouse ras recision gene (rrg). 88% of amino acids and 83% of nucleotides were conserved between human and rat lysyl oxidase. The mouse ras recision gene demonstrated 89% conservation of amino acids with human lysyl oxidase. The sequence conservation was not evenly distributed along the molecule. The carboxy terminus of the protein, which contains the putative copper binding sites and is likely to be the catalytically active domain, was more highly conserved than the amino terminus. The 89% amino acid sequence similarity between the murine ras recision gene and human lysyl oxidase suggests that they are the same gene product. Therefore, in addition to cross linking of extracellular matrix proteins, lysyl oxidase may have a direct role in tumor suppression. Northern blot analysis of poly A + RNA from cultured skin fibroblasts revealed at least three-distinct transcripts, sized 4.8 kb, 3.8 kb and 2.0 kb. In addition, using a panel of human mouse cell hybrids, the lysyl oxidase gene was assigned to human chromosome 5.

关键词： coding sequence CHROMOSOME ASSIGNMENT HUMAN LYSYL OXIDASE RRG

来源：评论

学校读者我要写书评

暂无评论

STRUCTURE AND EXPRESSION OF PEA MITOCHONDRIAL F1ATPASE ALPHA-SUBUNIT GENE AND ITS PSEUDOGENE INVOLVED IN HOMOLOGOUS RECOMBINATION

引用

JOURNAL OF BIOCHEMISTRY 1987年第4期101卷 967-976页

作者： MORIKAMI, A NAKAMURA, K NAGOYA UNIV FAC AGR BIOCHEM LAB CHIKUSA KU NAGOYA AICHI 464 JAPAN

We have characterized four pea mitochondrial DNA segments carrying the F1ATPase .alpha.-subunit coding sequences. These four types share a common 1.7-kb repeat sequence flanked by four combinations of two different left- and right-hand sequences. These results suggest that the .alpha.-subunit genes locate at the homologous recombination sites in the pea mitochondrial genome and that homologous recombination between two of these loci generates the other two types of structures. The uninterrupted .alpha.-subunit coding sequence of 1,521 bp is present in two of these loci. A rearrangement of 965 bp 3'' to the ATG initiation codon generates two copies of pseudogenes where the C-terminal two-thirds of the .alpha.-subunit coding sequence is replaced with an unidentified coding frame. The other border of sequence divergence is located 733 bp upstream of the ATG initiation codon. Although multiple forms of .alpha.-subunit gene transcripts are present in mitochondria, the pseudogenes do not seem to express any .alpha.-subunit-related polypeptide.

关键词： Two Initiator Codon sequences Loci Pseudogenes coding sequence Peas loci Homologous Recombination Mitochondrial Genome Antithymoglobulin Mitochondria

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：