نتایج جستجو برای: genealogy

تعداد نتایج: 2848  

2009
Nam Wook Kim

We present a machine learning approach for estimating missing temporal attributes in genealogical data. Genealogy analyses have been commonly focused on understanding generational relations. The importance of temporal analyses has often been suppresed in genealogical research. We have observed that temporal attributes of an individual, birth, death, marriage and divorce dates, are frequently mi...

Journal: :Trends in ecology & evolution 2009
Mary K Kuhner

Coalescent genealogy samplers attempt to estimate past qualities of a population, such as its size, growth rate, patterns of gene flow or time of divergence from another population, based on samples of molecular data. Genealogy samplers are increasingly popular because of their potential to disentangle complex population histories. In the last decade they have been widely applied to systems ran...

Journal: :Theoretical population biology 2000
M Stephens

In this paper we consider the genealogy of a random sample of n chromosomes from a panmictic population which has evolved with constant size N over many generations. We address two related problems. First we describe how genealogical information may be usefully partitioned into information on the events (mutations and coalescences) which occur in the genealogy, and the times between these event...

2015
Qiansheng Zhang Xinmeng Zhang Bailin Xie

This paper presents a novel warning decision model for uncertain network public sentiment emergency of which index assessments are provided as uncertain values. First, a weighted grey relational formula is proposed to compute the comprehensive grey relational degree between the unknown network public sentiment emergency and each original emergency case. According to the evaluated grey relation ...

2014
BRIAN EPSTEIN

Many theorists have regarded genealogy as an important technique for social criticism. But it has been unclear how genealogy can go beyond the accomplishments of other, more mundane, critical methods. I propose a new approach to understanding the critical potential of history. I argue that theorists have been misled by the assumption that if a claim is deserving of criticism, it is because the ...

Journal: :Australasian J. Combinatorics 2004
Anton Betten

Abstract Recent years have seen a dramatic increase in existence results for tdesigns with large t, i.e. t ≥ 5. Designs are now known to exist for several thousand parameter sets, mostly constructed by the method of orbiting under a group. This note is a contribution to the classification of these designs by parameters. We take an abstract look at admissible parameter sets in general. We introd...

2009
Jesse E. Taylor Amandine Véber

We investigate the infinitely many demes limit of the genealogy of a sample of individuals from a subdivided population that experiences sporadic mass extinction events. By exploiting a separation of time scales that occurs within a class of structured population models generalizing Wright’s island model, we show that as the number of demes tends to infinity, the limiting form of the genealogy ...

2014
Götz Kersting Jason Schweinsberg Anton Wakolbinger

In mathematical population genetics, it is well known that one can represent the genealogy of a population by a tree, which indicates how the ancestral lines of individuals in the population coalesce as they are traced back in time. As the population evolves over time, the tree that represents the genealogy of the population also changes, leading to a tree-valued stochastic process known as the...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Yujun Cui Chang Yu Yanfeng Yan Dongfang Li Yanjun Li Thibaut Jombart Lucy A Weinert Zuyun Wang Zhaobiao Guo Lizhi Xu Yujiang Zhang Hancheng Zheng Nan Qin Xiao Xiao Mingshou Wu Xiaoyi Wang Dongsheng Zhou Zhizhen Qi Zongmin Du Honglong Wu Xianwei Yang Hongzhi Cao Hu Wang Jing Wang Shusen Yao Alexander Rakin Yingrui Li Daniel Falush Francois Balloux Mark Achtman Yajun Song Jun Wang Ruifu Yang

The genetic diversity of Yersinia pestis, the etiologic agent of plague, is extremely limited because of its recent origin coupled with a slow clock rate. Here we identified 2,326 SNPs from 133 genomes of Y. pestis strains that were isolated in China and elsewhere. These SNPs define the genealogy of Y. pestis since its most recent common ancestor. All but 28 of these SNPs represented mutations ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1998
A S Peek R A Feldman R A Lutz R C Vrijenhoek

Vesicomyid clams depend entirely on sulfur-oxidizing endosymbiotic bacteria for their nutriment. Endosymbionts that are transmitted cytoplasmically through eggs, such as these, should exhibit a phylogenetic pattern that closely parallels the phylogeny of host mitochondrial genes. Such parallel patterns are rarely observed, however, because they are obscured easily by small amounts of horizontal...

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