A dynamic fuzzy clustering method based on genetic algorithm

A dynamic fuzzy clustering method is presented based on the genetic algorithm. By calculating the fuzzy dissimilarity between samples the essential associations among samples are modeled factually. The fuzzy dissimilarity between two samples is mapped into their Euclidean distance, that is, the high dimensional samples are mapped into the two-dimensional plane. The mapping is optimized globally by the genetic algorithm, which adjusts the coordinates of each sample, and thus the Euclidean distance, to approximate to the fuzzy dissimilarity between samples gradually. A key advantage of the proposed method is that the clustering is independent of the space distribution of input samples, which improves the flexibility and visualization. This method possesses characteristics of a faster convergence rate and more exact clustering than some typical clustering algorithms. Simulated experiments show the feasibility and availability of the proposed method.     

生物机制在智能计算中的应用

揭示生物机制在智能计算中的应用。与生物学相关理论相结合 ,论述遗传算法、人工神经网络和DNA计算的生物机制 ,揭示生物学思想在其中的应用 ,说明现在各类学科交叉发展的趋势     

一种基于遗传算法的BP神经网络算法及其应用

主要分析了神经网络和遗传算法的特点和存在的一些缺陷，研究了遗传算法和BP神经网络学习算法相结合的相关技术，设计并实现了一个基于遗传算法的BP神经网络算法BP—GA，已应用于肺癌早期细胞病理诊断系统中。实验结果表明，该算法具有较强的收敛性和鲁棒性，其应用效果很好。     

准噶尔盆地南缘构造物理模拟实验

根据准噶尔盆地南缘地质构造特征和相似理论 ,成功地设计并进行了两组实验 :①利用砂箱模拟了该区剖面中可见的三排背斜带以及背斜紧闭、向斜开阔的特征 ;②利用湿粘土模拟了南缘几排背斜带与边界断裂斜交成“入”字型的平面特征 ,对西南缘存在东、西分段性的形成机制给予了很好的解释。模拟实验结果表明 ,压扭性走滑作用可以产生准噶尔盆地南缘的复杂构造现象 ,在右行压扭的区域动力学背景下可以产生与主位移带呈高角度斜交的张扭性断裂 ,以此可以解释南缘地区东、西分带的原因     

Genetic Diversity in Populations of Sepiella maindroni Using 16S rRNA Gene Sequence Analysis

Part of the 16S rRNA gene is amplified with PCR and sequenced for 5 populations of common Chinese cuttlefish Sepiella maindroni:three from the South China Sea,one from East China Sea and one from Japan.The result shows that a total of 5 nucleotide positions are found to have gaps or insertions of base pairs among these individuals,and 13 positions are examined to be variable in all the sequences,which range from 494 to 509 base pairs.All of the individuals are grouped into 7 haplotypes (h1-h7).No marked genetic difference is osberved among those populations.All of the individuals from Nagasaki belong to h1 and the h3 haplotype is found only in the coastal waters of China.A→←G transition in Nucleotide 255 is suggested to be taken as a kind of genetic marker to identify the populations distributed in East-South China Sea and the Nagasaki waters of Japan.     

Design and Implementation of a Novel Algorithm for Iterative Decoding of Product Codes

A novel product code iterative decoding algorithm and its high speed implementation scheme are proposed in this paper.Based on partial combination of selected columns of check matrix,the reduced-complexity syndrome decoding method is proposed to decode sub-codes of product code and deliver soft output information.So iterative decoding of product codes is possible.The fast sorting algorithm and a look-up method are proposed for high speed implementation of this algo-rithm.Compared to the conventional weighing iterative algorithm,the proposed algorithm has lower complexity while offering better performance,which is demonstrated by simulations and implementation analysis.The implementation scheme and verilog HDL simulation show that it is feasible to achieve high speed decoding with the proposed algorithm.     

4种木麻黄亲缘关系的RAPD分析

应用RAPD枝术对普通木麻黄(Casuarina equiseti folia)，粗枝木麻黄(C.gluca)，细枝木麻黄(C．cunninghamaina)和滨海木麻黄(Allocasuarina littoralis)的亲缘关系进行分析，从40个引物中筛选出18个重复性好、稳定性高的有效引物．18个有效引物共扩增出690条DNA带，其中多态性条带318条，占总扩增条带的46．09％．对扩增出来的690条DNA带进行聚类分析，结果表明：木麻黄属(Casuarina)的普通木麻黄、粗枝木麻黄和细枝木麻黄的平均遗传距离为0．30，其中细枝木麻黄和粗枝木麻黄的遗传距离特别小，为0．19；而异果木麻黄属(Allocasuarina)的滨海木麻黄与其他3种木麻黄的平均遗传距离为0．65．RAPD聚类分析结果表明，4种木麻黄之间的亲缘关系与血清学和化学分类学的结果一致，说明RAPD分子标记技术适用于木麻黄植物的遗传多样性研究．     

台湾海区斜带石斑鱼群体遗传学的等位酶研究

应用聚丙烯酰胺凝胶和淀粉凝胶技术对台湾海区斜带石斑鱼的遗传结构和遗传多样性水平进行了等位酶分析。对18种酶系统共27个等位酶基因座位的检测表明。ADH—l、ODH-2、FDH-1和Est-3等5个基因座位具多态性，其群体的多态位点百分率P为18．5％。有效等位基因平均数Ne为1．185，平均杂合度的观测值Ho为0．0469，预期值He为0．0662，反映了该群体的遗传多样性水平在鱼类中处于中等程度，而其Hardy-Weinberg遗传偏离指数(D)为-0．246，表明该群体仍存在着明显的杂合子缺失现象，相对于捕捞压力，海岸线的工程改造是对其资源的更主要威胁。     

一种用于多峰函数优化的改进混合遗传算法

针对遗传算法在处理复杂多峰函数优化问题中存在的一些缺陷，提出了一种改进型的混合遗传算法，它在小生境技术的基础上引入单纯搜索算法、最优保存算法和近优淘汰算法，并使之相互结合，经编程实践证明，这种改进的混合遗传算法在处理复杂多峰函数优化问题时，局部搜索能力和克服过早收敛能力方面都显著优于标准遗传算法，并在实际应用中取得了较好的效果。     

基因工程中常用的酶及其功能分析

酶是活细胞所产生的一种具有特殊催化功能的蛋白质,在生物工程中应用非常广泛,如食品、医药、废水处理等方面.基因工程中常用的酶主要包括核酸酶、连接酶、聚合酶和修饰酶,分别发挥着不同的功能.