针对求解多目标优化问题(MOP:Multi-Objective Problem)时,人工蜂群算法(ABC:Artificial Bee Colony)存在难以收敛和候选解多样性难以保持的问题,对其各部分求解策略进行了改进。基于ABC算法框架,设计了一种基于自适应求解策略的多目标...针对求解多目标优化问题(MOP:Multi-Objective Problem)时,人工蜂群算法(ABC:Artificial Bee Colony)存在难以收敛和候选解多样性难以保持的问题,对其各部分求解策略进行了改进。基于ABC算法框架,设计了一种基于自适应求解策略的多目标ABC算法,并在机电执行器设计的实际应用工程设计问题中,将所提出的改进多目标ABC与其他典型的群智能算法进行优化性能比较。通过实验验证可知,所提出的MOABC/DD(Multi-Objective Artificial Bee Colony Based on Dominance and Decomposition)算法在求解机电执行器设计问题基准测试用例时,与典型算法相比,具有较好的问题求解精度。并且MOABC/DD的实验结果较为稳定,从而证明了MOABC/DD具有较高的求解稳定性和健壮性。展开更多
Magnolia grandiflora is an important medicinal, ornamental and horticultural plant species. The chloroplast （cp） genome of M. grandiflora was sequenced using a 454 sequencing platform and the genome structure was co...Magnolia grandiflora is an important medicinal, ornamental and horticultural plant species. The chloroplast （cp） genome of M. grandiflora was sequenced using a 454 sequencing platform and the genome structure was compared with other related species. The complete cp genome ofM. grandiflora was 159623 bp in length and contained a pair of inverted repeats （IR） of 26563 bp separated by large and small single copy （LSC, SSC） regions of 87757 and 18740 bp, respectively. A total of 129 genes were successfully annotated, 18 of which included introns. The identity, number and GC content of M. grandiflora cp genes were similar to those of other Magnoliaceae species genomes. Analysis revealed 218 simple sequence repeat （SSR） loci, most composed of A or T, contributing to a bias in base composition. The types and abundances of repeat units in Magnoliaceae species were relatively conserved and these loci will be useful for developing M. grandiflora cp genome vectors. In addition, results indicated that the cp genome size in Magnoliaceae species and the position of the IR border were closely related to the length of the ycfl gene. Phylogenetic analyses based on 66 shared genes from 30 species using maximum parsimony （MP） and max- imum likelihood （ML） methods provided strong support for the phylogenetic position of Magnolia. The availability of the complete cp genome sequence of M. grandiflora provides valuable information for breeding of desirable varieties, cp genetic engineering, developing useful molecular markers and phylogenetic analyses in Magnoliaceae.展开更多
文摘针对求解多目标优化问题(MOP:Multi-Objective Problem)时,人工蜂群算法(ABC:Artificial Bee Colony)存在难以收敛和候选解多样性难以保持的问题,对其各部分求解策略进行了改进。基于ABC算法框架,设计了一种基于自适应求解策略的多目标ABC算法,并在机电执行器设计的实际应用工程设计问题中,将所提出的改进多目标ABC与其他典型的群智能算法进行优化性能比较。通过实验验证可知,所提出的MOABC/DD(Multi-Objective Artificial Bee Colony Based on Dominance and Decomposition)算法在求解机电执行器设计问题基准测试用例时,与典型算法相比,具有较好的问题求解精度。并且MOABC/DD的实验结果较为稳定,从而证明了MOABC/DD具有较高的求解稳定性和健壮性。
基金supported by the National Natural Science Foundation of China (30970307, 81130069)the Innovation Research Team of the University of Ministry of Education of China (IRT1150)
文摘Magnolia grandiflora is an important medicinal, ornamental and horticultural plant species. The chloroplast （cp） genome of M. grandiflora was sequenced using a 454 sequencing platform and the genome structure was compared with other related species. The complete cp genome ofM. grandiflora was 159623 bp in length and contained a pair of inverted repeats （IR） of 26563 bp separated by large and small single copy （LSC, SSC） regions of 87757 and 18740 bp, respectively. A total of 129 genes were successfully annotated, 18 of which included introns. The identity, number and GC content of M. grandiflora cp genes were similar to those of other Magnoliaceae species genomes. Analysis revealed 218 simple sequence repeat （SSR） loci, most composed of A or T, contributing to a bias in base composition. The types and abundances of repeat units in Magnoliaceae species were relatively conserved and these loci will be useful for developing M. grandiflora cp genome vectors. In addition, results indicated that the cp genome size in Magnoliaceae species and the position of the IR border were closely related to the length of the ycfl gene. Phylogenetic analyses based on 66 shared genes from 30 species using maximum parsimony （MP） and max- imum likelihood （ML） methods provided strong support for the phylogenetic position of Magnolia. The availability of the complete cp genome sequence of M. grandiflora provides valuable information for breeding of desirable varieties, cp genetic engineering, developing useful molecular markers and phylogenetic analyses in Magnoliaceae.
