研究638株德江红天麻(Gastrodia elata BI. f. elata)的18个农艺性状,并进行变异系数、相关性、因子和通径分析。结果表明,德江红天麻地上部分农艺性状中,花茎粗度、花被筒长度、花被筒宽度、子房长度、果实长度和果实宽度具有较高的一...研究638株德江红天麻(Gastrodia elata BI. f. elata)的18个农艺性状,并进行变异系数、相关性、因子和通径分析。结果表明,德江红天麻地上部分农艺性状中,花茎粗度、花被筒长度、花被筒宽度、子房长度、果实长度和果实宽度具有较高的一致性和特异性,其因子贡献率和通径分析的正向直接作用也较大;地下部分主要农艺性状中,纵长、横长和环纹数的变异系数较小,与单个块茎鲜重有极为显著的相关性,其因子贡献率和通径分析的正向直接作用也较大。上述主要农艺性状可作为德江红天麻品质控制和品种选育的关键性状指标。展开更多
Wavelength and bandwidth allocation is important for multicast communication in optical networks. In this paper,a new method based on scheduling theory is proposed. The proposed method formulates wavelength bandwidth ...Wavelength and bandwidth allocation is important for multicast communication in optical networks. In this paper,a new method based on scheduling theory is proposed. The proposed method formulates wavelength bandwidth capacity as a large rectangle and these multicast stream bandwidth requirements as small rectangles. It treats the wavelength and bandwidth allocation question as a rectangle packing problem. The proposed algorithm solves the problem by taking quasi-human strategy with Euclidian distance. It is an effective heuristic algorithm to quickly solve multicast stream bandwidth allocation problem in optical networks by theoretic analysis. Further simulation experiments show the bandwidth allocation algorithm can increase network utilization and have a good fairness performance for unicast stream and multicast stream in optical networks. The results indicate the effectiveness of the algorithm.展开更多
文摘研究638株德江红天麻(Gastrodia elata BI. f. elata)的18个农艺性状,并进行变异系数、相关性、因子和通径分析。结果表明,德江红天麻地上部分农艺性状中,花茎粗度、花被筒长度、花被筒宽度、子房长度、果实长度和果实宽度具有较高的一致性和特异性,其因子贡献率和通径分析的正向直接作用也较大;地下部分主要农艺性状中,纵长、横长和环纹数的变异系数较小,与单个块茎鲜重有极为显著的相关性,其因子贡献率和通径分析的正向直接作用也较大。上述主要农艺性状可作为德江红天麻品质控制和品种选育的关键性状指标。
基金Funded by the Project "Research on Key Technology and System of next Generation Optical Access" of Open Foundation of State Key Laboratory of Optical Communication Technologies and Networks,Wuhan Research Institute of Posts&Telecommunications(No.2010OCTN-03)
文摘Wavelength and bandwidth allocation is important for multicast communication in optical networks. In this paper,a new method based on scheduling theory is proposed. The proposed method formulates wavelength bandwidth capacity as a large rectangle and these multicast stream bandwidth requirements as small rectangles. It treats the wavelength and bandwidth allocation question as a rectangle packing problem. The proposed algorithm solves the problem by taking quasi-human strategy with Euclidian distance. It is an effective heuristic algorithm to quickly solve multicast stream bandwidth allocation problem in optical networks by theoretic analysis. Further simulation experiments show the bandwidth allocation algorithm can increase network utilization and have a good fairness performance for unicast stream and multicast stream in optical networks. The results indicate the effectiveness of the algorithm.
