异步异构分层并行演化算法及其在串并系统可靠性优化中的应用(英文)

本文提出了一种新的并行演化算法――异步异构分层并行演化算法(AHHPGA),用于求解串并系统可靠性分配的多目标优化问题(RAP)。AHHPGA采用分层结构,上层由粗粒度模型构成,下层由细粒度模型构成。在AHHPGA的每个子种群中,采用不同的全局/局部搜索度和拓扑结构,构成异构模型。AHHPGA的迁移方式包括异步接收和异步迁出。采用基于模型的复杂系统可靠性评价工具(HiP-HOPS),以克服可靠性框图方法(RBD)的缺点。仿真结果表明,基于异步异构分层并行演化算法和HiP-HOPS工具的串并系统可靠性分配的多目标优化方法,优于传统的基于遗传算法的优化方法。     

Recollections of parental style and perceptions of current family functioning at age 50

It is hypothesized that recollections of an individual's parental behaviour towards them is associated with their view of their current family functioning. This hypothesis was tested for using data provided by 213 men and 270 women drawn at age 50 from the Newcastle Thousand Families Study. Relationships between retrospective reports of parental behaviour during childhood and perceptions of current family functioning at age 50 were investigated using a univariate regression analysis in order to explore the relationship between scores on the Parental Bonding Instrument (PBI) and the McMaster Family Assessment Device (FAD). Where a significant association was observed the relationship between subscale scores was further examined using a multivariate regression analysis including gender and self‐reported psychological well‐being (as measured by the General Health Questionnaire‐ GHQ) as covariates. Several statistically significant associations between PBI and FAD subscale scores were observed. Four of these remained statistically significant once gender and self‐reported psychological well‐being were adjusted for. In this population sample, aspects of recalled parental behaviour were associated with the health of current family functioning in several domains as reported by the FAD. These associations appear to be partly mediated by current psychological well‐being.     

Temporal integration of spatially filtered visual images.

Factors which govern the temporal integration of spatial information were examined in a group of five experiments. A series of high-pass and low-pass spatially filtered versions of a visual scene were generated. Observers' ratings of these filtered versions of the scene for perceived image quality indicated that quality was determined both by the bandwidth of spatial information and the presence of high-spatial-frequency edge information. When sequences of three different versions of the scene were presented over an interval of 120 ms the perceived quality of the resulting composite image was determined both from the ratings of the individual components of that sequence and from the order in which these components were presented. When the order of spatial information in a sequence moved from coarse to fine detail the perceived quality of the composite image was significantly better than when the order moved from fine to coarse. This evidence of a coarse-to-fine bias in pattern integration was further investigated with a detection paradigm. The pattern of errors once again indicated that temporal integration of spatial information was superior when a coarse-to-fine mode of information delivery was employed. Taken together the data indicate that the pattern-integration mechanism has an inherent order bias and does not accumulate spatial information so efficiently when the 'natural' coarse-to-fine order is violated.