A hybrid model that is based on the Combination of keywords and concept was put forward. The hybrid model is built on vector space model and probabilistic reasoning network. It not only can exert the advantages of key...A hybrid model that is based on the Combination of keywords and concept was put forward. The hybrid model is built on vector space model and probabilistic reasoning network. It not only can exert the advantages of keywords retrieval and concept retrieval but also can compensate for their shortcomings. Their parameters can be adjusted according to different usage in order to accept the best information retrieval result, and it has been proved by our experiments.展开更多
The aim of this paper is to evaluate the fatigue reliability with hybrid uncertain parameters based on a residual strength model. By solving the non-probabilistic setbased reliability problem and analyzing the reliabi...The aim of this paper is to evaluate the fatigue reliability with hybrid uncertain parameters based on a residual strength model. By solving the non-probabilistic setbased reliability problem and analyzing the reliability with randomness, the fatigue reliability with hybrid parameters can be obtained. The presented hybrid model can adequately consider all uncertainties affecting the fatigue reliability with hybrid uncertain parameters. A comparison among the presented hybrid model, non-probabilistic set-theoretic model and the conventional random model is made through two typical numerical examples. The results show that the presented hybrid model, which can ensure structural security, is effective and practical.展开更多
在确定性规划准则和概率性规划准则的基础上,提出一个应用于输电网中长期规划的混合性规划模型。该模型采用静态安全柔性约束、故障发生概率、可靠性成本、投资费用、期望缺供电量(expected energy not served,EENS)以及缺电时间期望(lo...在确定性规划准则和概率性规划准则的基础上,提出一个应用于输电网中长期规划的混合性规划模型。该模型采用静态安全柔性约束、故障发生概率、可靠性成本、投资费用、期望缺供电量(expected energy not served,EENS)以及缺电时间期望(loss of load expectation,LOLE)等因素来计算、评估潜在故障的影响,并通过建立电网成本期望值最小的目标函数、经济性约束和可靠性约束保证电网规划的可靠性和经济性,利用直流潮流模型和最优潮流模型将输电网规划问题转为混合整数线性规划问题,采用商业优化软件CPLEX进行寻优计算,实现了为输电网规划寻找最优规划方案的目的。最后,通过与传统规划模型的比较和实际电网算例验证了模型的合理性、有效性和经济性。展开更多
文摘A hybrid model that is based on the Combination of keywords and concept was put forward. The hybrid model is built on vector space model and probabilistic reasoning network. It not only can exert the advantages of keywords retrieval and concept retrieval but also can compensate for their shortcomings. Their parameters can be adjusted according to different usage in order to accept the best information retrieval result, and it has been proved by our experiments.
基金supported by the National Natural Science Foundation of China (90816024, 10872017 and 10876100)the 111 Project (B07009)the Innovation Foundation of Beihang University for PhD Graduates
文摘The aim of this paper is to evaluate the fatigue reliability with hybrid uncertain parameters based on a residual strength model. By solving the non-probabilistic setbased reliability problem and analyzing the reliability with randomness, the fatigue reliability with hybrid parameters can be obtained. The presented hybrid model can adequately consider all uncertainties affecting the fatigue reliability with hybrid uncertain parameters. A comparison among the presented hybrid model, non-probabilistic set-theoretic model and the conventional random model is made through two typical numerical examples. The results show that the presented hybrid model, which can ensure structural security, is effective and practical.
文摘在确定性规划准则和概率性规划准则的基础上,提出一个应用于输电网中长期规划的混合性规划模型。该模型采用静态安全柔性约束、故障发生概率、可靠性成本、投资费用、期望缺供电量(expected energy not served,EENS)以及缺电时间期望(loss of load expectation,LOLE)等因素来计算、评估潜在故障的影响,并通过建立电网成本期望值最小的目标函数、经济性约束和可靠性约束保证电网规划的可靠性和经济性,利用直流潮流模型和最优潮流模型将输电网规划问题转为混合整数线性规划问题,采用商业优化软件CPLEX进行寻优计算,实现了为输电网规划寻找最优规划方案的目的。最后,通过与传统规划模型的比较和实际电网算例验证了模型的合理性、有效性和经济性。
