针对以往基于离散度函数(function of degree of disagreement, FDOD)度量对航空发动机的健康状况进行综合评价时,未全面考虑各指标的权重,导致评价结果不够准确的问题,提出一种改进FDOD度量的综合评价方法。首先,利用序关系分析法(简称...针对以往基于离散度函数(function of degree of disagreement, FDOD)度量对航空发动机的健康状况进行综合评价时,未全面考虑各指标的权重,导致评价结果不够准确的问题,提出一种改进FDOD度量的综合评价方法。首先,利用序关系分析法(简称为G1法)确定各指标的主观权重,利用因子分析法确定各指标间的相关性,得到各指标的客观权重。其次,基于离差最大化的组合赋权法确定各指标的组合权重,使赋权结果更加科学合理,提高不同对象的区分度。然后,基于组合权重对传统FDOD度量进行改进,以提高综合评价的准确性。最后,通过美国国家航空航天局提供的涡扇发动机性能仿真数据,验证了所提方法的有效性。展开更多
SARS-CoV, as the pathogeny of severe acute respiratory syndrome (SARS), is a mystery that the origin of the virus is still unknown even a few isolates of the virus were completely sequenced. To explore the genesis of ...SARS-CoV, as the pathogeny of severe acute respiratory syndrome (SARS), is a mystery that the origin of the virus is still unknown even a few isolates of the virus were completely sequenced. To explore the genesis of SARS-CoV, the FDOD method previously developed by us was applied to comparing complete genomes from 12 SARS-CoV isolates to those from 12 previously identified coronaviruses and an unrooted phylogenetic tree was constructed. Our results show that all SARS-CoV isolates were clustered into a clique and previously identified coronaviruses formed the other clique. Meanwhile, the three groups of coronaviruses depart from each other clearly in our tree that is consistent with the results of prevenient papers. Differently, from the topology of the phylogenetic tree we found that SARS-CoV is more close to group 1 within genus coronavirus. The topology map also shows that the 12 SARS-CoV isolates may be divided into two groups determined by the association with the SARS-CoV from the Hotel M in Hong Kong that may give some information about the infectious relationship of the SARS.展开更多
SARS-CoV, as the pathogeny of severe acute respiratory syndrome (SARS), is a mystery that the origin of the virus is still unknown even a few isolates of the virus were completely sequenced. To explore the genesis of ...SARS-CoV, as the pathogeny of severe acute respiratory syndrome (SARS), is a mystery that the origin of the virus is still unknown even a few isolates of the virus were completely sequenced. To explore the genesis of SARS-CoV, the FDOD method previously developed by us was applied to comparing complete genomes from 12 SARS-CoV isolates to those from 12 previously identified coronaviruses and an unrooted phylogenetic tree was constructed. Our results show that all SARS-CoV isolates were clustered into a clique and previously identified coronaviruses formed the other clique. Meanwhile, the three groups of coronaviruses depart from each other clearly in our tree that is consistent with the results of prevenient papers. Differently, from the topology of the phylogenetic tree we found that SARS-CoV is more close to group 1 within genus coronavirus. The topology map also shows that the 12 SARS-CoV isolates may be divided into two groups determined by the association with the SARS-CoV from the Hotel M in Hong Kong that may give some information about the infectious relationship of the SARS.展开更多
文摘针对以往基于离散度函数(function of degree of disagreement, FDOD)度量对航空发动机的健康状况进行综合评价时,未全面考虑各指标的权重,导致评价结果不够准确的问题,提出一种改进FDOD度量的综合评价方法。首先,利用序关系分析法(简称为G1法)确定各指标的主观权重,利用因子分析法确定各指标间的相关性,得到各指标的客观权重。其次,基于离差最大化的组合赋权法确定各指标的组合权重,使赋权结果更加科学合理,提高不同对象的区分度。然后,基于组合权重对传统FDOD度量进行改进,以提高综合评价的准确性。最后,通过美国国家航空航天局提供的涡扇发动机性能仿真数据,验证了所提方法的有效性。
基金Natural Science Foundation of the Education Department of Henan Province,China(2006520022)Youth Foundation of Zhoukou Normal University(ZKNUQN200615)
文摘SARS-CoV, as the pathogeny of severe acute respiratory syndrome (SARS), is a mystery that the origin of the virus is still unknown even a few isolates of the virus were completely sequenced. To explore the genesis of SARS-CoV, the FDOD method previously developed by us was applied to comparing complete genomes from 12 SARS-CoV isolates to those from 12 previously identified coronaviruses and an unrooted phylogenetic tree was constructed. Our results show that all SARS-CoV isolates were clustered into a clique and previously identified coronaviruses formed the other clique. Meanwhile, the three groups of coronaviruses depart from each other clearly in our tree that is consistent with the results of prevenient papers. Differently, from the topology of the phylogenetic tree we found that SARS-CoV is more close to group 1 within genus coronavirus. The topology map also shows that the 12 SARS-CoV isolates may be divided into two groups determined by the association with the SARS-CoV from the Hotel M in Hong Kong that may give some information about the infectious relationship of the SARS.
文摘SARS-CoV, as the pathogeny of severe acute respiratory syndrome (SARS), is a mystery that the origin of the virus is still unknown even a few isolates of the virus were completely sequenced. To explore the genesis of SARS-CoV, the FDOD method previously developed by us was applied to comparing complete genomes from 12 SARS-CoV isolates to those from 12 previously identified coronaviruses and an unrooted phylogenetic tree was constructed. Our results show that all SARS-CoV isolates were clustered into a clique and previously identified coronaviruses formed the other clique. Meanwhile, the three groups of coronaviruses depart from each other clearly in our tree that is consistent with the results of prevenient papers. Differently, from the topology of the phylogenetic tree we found that SARS-CoV is more close to group 1 within genus coronavirus. The topology map also shows that the 12 SARS-CoV isolates may be divided into two groups determined by the association with the SARS-CoV from the Hotel M in Hong Kong that may give some information about the infectious relationship of the SARS.
