番石榴4个品种间的遗传多样性RAPD分析

应用RAPD技术对番石榴4个品种的遗传多样性和亲缘关系进行分析,从50个随机引物中筛选出7个多态性明显、反应稳定的引物,共扩增出49条谱带,且全部为多态性谱带,对扩增出来的49条带进行统计分析、计算遗传距离,并PAUP4.0b10软件包选择UPGMA法对所得到数据矩阵进行聚类分析.结果表明4个品种之间的遗传距离为0.154 74-0.451 61,存在明显遗传差异,并且它们可以被分为两大类.     

基于遗传算法的无人机航路规划与建模仿真

依据无人机设计需求,建立了威胁源模型、无人机飞行动力学模型、导航模型和航路规划模型。航路规划采用遗传算法,遗传算法编码方案使用＂距离、转角＂方案。通过Matlab/Simlink进行仿真验证,证明了规划航路符合无人机动力学特性。     

基于遗传算法的ISAR运动补偿新算法

提出了基于遗传算法进行逆合成孔径雷达运动补偿的新算法.针对遗传算法解的收敛性问题,在遗传算法中采用了最优个体保存策略,使得解以概率1收敛于全局最优解;针对遗传算法运算量大的问题,提出了采用运动补偿后最小熵和最小距离作为适应度函数,由此形成2种称为GAMCE和GAMCD的ISAR运动补偿新算法.仿真数据和实测数据验证了所提新算法的有效性.     

HHGA-RBFNN在DGS设计中的应用

将递阶遗传算法和最小二乘法相结合, 构成一种混合递阶遗传算法,用于优化径向基函数神经网络的结构和参数,通过MATLAB仿真实现该算法,并将该神经网络运用于微带缺陷接地结构的神经网络建模之中,实现对微带缺陷接地结构传输系数的仿真.实验结果表明,应用混合递阶遗传算法优化的径向基函数神经网络,具有很高的拟合精度和很好的泛化能力,可以与时域有限差分分析方法结合,辅助微带缺陷接地结构的设计.     

核电站建设项目进度模糊遗传优化控制研究

文章针对核电建设项目进度控制的不确定性特点,运用模糊规划理论构建了核电进度计划的模糊目标及模糊约束的模糊集成模型,然后应用遗传算法解决了进度计划动态优化调整问题,并以某核电站建设进度计划为例,较好的实现了工期、成本的协调优化,创造了较好的经济价值,为核电站项目管理提供了应用前景。     

竞争环境下的轴-辐式集装箱海运网络设计问题

针对航运企业的重组与全球扩张引起的竞争问题,提出了竞争环境下的轴-辐式集装箱海运网络设计模型。模型采用基于路径的变量作为决策变量,利用离散函数来表示航运企业与航运联盟的竞争可吸引的流量(或客户),目的在于通过设计混合轴-辐式集装箱海运网络,实现以更低的服务成本和更短的服务时间最大化可吸引的流量,建立了枢纽港口数量约束、航线连接约束、航线中转约束、流量竞争约束等,运用多点交叉遗传算法进行求解,最后结合亚欧航线的集装箱海运市场进行实例分析,对考虑客户需求多样性与航运联盟对策下的轴-辐式集装箱海运网络进行设计,并验证了算法的计算效果。     

Genetic variants in ATP6 and ND3 mitochondrial genes are not associated with aggressive prostate cancer in Mexican–Mestizo men with overweight or obesity

Mitochondrial defects have been related to obesity and prostate cancer. We investigated if Mexican–Mestizo men presenting this type of cancer, exhibited somatic mutations of ATP6 and/or ND3.Body mass index (BMI) was determined; the degree of prostate cancer aggressiveness was demarcated by the Gleason score. DNA from tumor tissue and from blood leukocytes was amplified by the polymerase chain reaction and ATP6 and ND3 were sequenced. We included 77 men: 20 had normal BMI, 38 were overweight and 19 had obesity; ages ranged from 52 to 83. After sequencing ATP6 and ND3, from DNA obtained from leukocytes and tumor tissue, we did not find any somatic mutations. All changes observed, in both genes, were polymorphisms. In ATP6 we identified, in six patients, two non-synonymous nucleotide changes and in ND3 we observed that twelve patients presented non-synonymous polymorphisms. To our knowledge, this constitutes the first report where the complete sequences of the ATP6 and ND3 have been analyzed in Mexican–Mestizo men with prostate cancer and diverse BMI. Our results differ with those reported in Caucasian populations, possibly due to ethnic differences.     

Differentiating Contemporary Racial Prejudice from Old-Fashioned Racial Prejudice

The present study addresses the distinction between contemporary and old-fashioned prejudice using survey data from a national sample (n = 600) of self-identified whites living in the United States and interviewed by telephone in 2001. First, we examine associations among indicators of contemporary and old-fashioned prejudice. Consistent with the literature, contemporary and old-fashioned prejudice indicators represent two distinct but correlated common factors. Second, we examine whether belief in genetic race differences uniformly predicts both types of prejudice. As might be expected, belief in genetic race differences predicts old-fashioned prejudice but contrary to recent theorizing, it also predicts contemporary prejudice.     

引入模拟退火机制的新型遗传算法

提出了一种将遗传算法与模拟退火算法相结合的新搜索算法。该算法以遗传算法运算流程作为主体流程,并把模拟退火机制融入其中,用以调整优化群体。在进化过程中使用了保留策略,以保存适应度较好的个体。在模拟退火算法的跳变操作过程中使用类似遗传算法变异来实现,先作置反操作,再作前后等长交换操作,以防止陷入局部最优。实验表明,该算法与传统遗传算法相比,提高了进化速度和全局寻优能力。