基于《JCR期刊影响因子及分区情况》,从论文整体质量、学科结构分布、国际合作产出及基金论文产出等方面,对东华大学2005—2009年被SCI-E(Science Citation Index Expanded)收录的学术论文进行统计研究.通过对各学科论文产出能力的分析...基于《JCR期刊影响因子及分区情况》,从论文整体质量、学科结构分布、国际合作产出及基金论文产出等方面,对东华大学2005—2009年被SCI-E(Science Citation Index Expanded)收录的学术论文进行统计研究.通过对各学科论文产出能力的分析与对比,探讨东华大学的科研活动方向及发展趋势.并在统计分析的基础上,就如何提高东华大学科研水平、促进学科建设与发展提出具体建议.展开更多
In order to solve the problem of weighting factors selection in the conventional finite-control-set model predictive control for a grid-connected three-level inverter,an improved multi-objective model predictive contr...In order to solve the problem of weighting factors selection in the conventional finite-control-set model predictive control for a grid-connected three-level inverter,an improved multi-objective model predictive control without weighting factors based on hierarchical optimization is proposed.Four control objectives are considered in this strategy.The grid current and neutral-point voltage of the DC-link are taken as the objectives in the first optimization hierarchy,and by using fuzzy satisfaction decision,several feasible candidates of voltage vectors are determined.Then,the average switching frequency and common-mode voltage are optimized in the second hierarchy.The average ranking criterion is introduced to sort the objective functions,and the best voltage vector is obtained to realize the coordinated control of multiple objectives.At last,the effectiveness of the proposed strategy is verified by simulation results.展开更多
为了提高PageRank算法的准确性,从网络用户对已知网页进行评价的角度引入网页等级,从网页链接分析的角度解决权威性需求.结合网页链接分析和页面内容分析提出一种改进的PageRank算法PRP(PageRank based on Page-level).实验证明,算法为...为了提高PageRank算法的准确性,从网络用户对已知网页进行评价的角度引入网页等级,从网页链接分析的角度解决权威性需求.结合网页链接分析和页面内容分析提出一种改进的PageRank算法PRP(PageRank based on Page-level).实验证明,算法为扩展PageRank提供了广阔的空间,通过选择合适的参数page-level,可以提高传统PageRank算法的网页排序的准确性,有效防止恶意链接对pagerank排序值(PR值)造成的影响.展开更多
文摘基于《JCR期刊影响因子及分区情况》,从论文整体质量、学科结构分布、国际合作产出及基金论文产出等方面,对东华大学2005—2009年被SCI-E(Science Citation Index Expanded)收录的学术论文进行统计研究.通过对各学科论文产出能力的分析与对比,探讨东华大学的科研活动方向及发展趋势.并在统计分析的基础上,就如何提高东华大学科研水平、促进学科建设与发展提出具体建议.
基金Supported by the Key Research and Development Program of Hunan Province of China(2018GK2031)the Independent Research Project of State Key Laboratory of Advance Design and Manufacturing for Vehicle Body(71965005)+2 种基金the Innovative Construction Program of Hunan Province of China(2019RS1016)the 111 Project of China(B17016)the Excellent Innovation Youth Program of Changsha of China(KQ2009037).
文摘In order to solve the problem of weighting factors selection in the conventional finite-control-set model predictive control for a grid-connected three-level inverter,an improved multi-objective model predictive control without weighting factors based on hierarchical optimization is proposed.Four control objectives are considered in this strategy.The grid current and neutral-point voltage of the DC-link are taken as the objectives in the first optimization hierarchy,and by using fuzzy satisfaction decision,several feasible candidates of voltage vectors are determined.Then,the average switching frequency and common-mode voltage are optimized in the second hierarchy.The average ranking criterion is introduced to sort the objective functions,and the best voltage vector is obtained to realize the coordinated control of multiple objectives.At last,the effectiveness of the proposed strategy is verified by simulation results.
文摘为了提高PageRank算法的准确性,从网络用户对已知网页进行评价的角度引入网页等级,从网页链接分析的角度解决权威性需求.结合网页链接分析和页面内容分析提出一种改进的PageRank算法PRP(PageRank based on Page-level).实验证明,算法为扩展PageRank提供了广阔的空间,通过选择合适的参数page-level,可以提高传统PageRank算法的网页排序的准确性,有效防止恶意链接对pagerank排序值(PR值)造成的影响.
