In order to accurately describe the dynamic characteristics of flight vehicles through aerodynamic modeling, an adaptive wavelet neural network (AWNN) aerodynamic modeling method is proposed, based on subset kernel pr...In order to accurately describe the dynamic characteristics of flight vehicles through aerodynamic modeling, an adaptive wavelet neural network (AWNN) aerodynamic modeling method is proposed, based on subset kernel principal components analysis (SKPCA) feature extraction. Firstly, by fuzzy C-means clustering, some samples are selected from the training sample set to constitute a sample subset. Then, the obtained samples subset is used to execute SKPCA for extracting basic features of the training samples. Finally, using the extracted basic features, the AWNN aerodynamic model is established. The experimental results show that, in 50 times repetitive modeling, the modeling ability of the method proposed is better than that of other six methods. It only needs about half the modeling time of KPCA-AWNN under a close prediction accuracy, and can easily determine the model parameters. This enables it to be effective and feasible to construct the aerodynamic modeling for flight vehicles.展开更多
面向机器人的多种单一运动灵活性指标,基于主成分分析(principal component analysis,PCA)方法对其综合运动灵活性进行分析和评价,评价结果受奇异位形处指标极端值的影响。进而将模糊集引入PCA,使用模糊主成分分析(fuzzy principal comp...面向机器人的多种单一运动灵活性指标,基于主成分分析(principal component analysis,PCA)方法对其综合运动灵活性进行分析和评价,评价结果受奇异位形处指标极端值的影响。进而将模糊集引入PCA,使用模糊主成分分析(fuzzy principal component analysis,FPCA)方法进行机器人灵活性综合评价。通过调节模糊隶属函数,吸收奇异位形及其附近的极端值,突出主要信息,提高分析结果的准确性和可信度,提高机器人灵活性的综合评价的效果,从而提出一种基于多种性能指标的含奇异位形的机器人任务优选的新方法。展开更多
The purpose of objective and quantitative evaluating the organizational learning ability is to make the enterprise have reliable criterions and operable procedures during the process of improving the organizational le...The purpose of objective and quantitative evaluating the organizational learning ability is to make the enterprise have reliable criterions and operable procedures during the process of improving the organizational learning ability and founding learning organization. In this paper, an evaluating indicator system is established by analyzing the whole process of organizational learning; both qualitative and quantitative analyses are used, and a new combined evaluating method is presented. A measurement case involving twenty enterprises is given to prove the validity of this method. In conclusion, learning strategies are presented according to measurement result. This paper applies 4 models synthetically. The evaluating effect is superior to other methods.展开更多
基金Project(51209167) supported by Youth Project of the National Natural Science Foundation of ChinaProject(2012JM8026) supported by Shaanxi Provincial Natural Science Foundation, China
文摘In order to accurately describe the dynamic characteristics of flight vehicles through aerodynamic modeling, an adaptive wavelet neural network (AWNN) aerodynamic modeling method is proposed, based on subset kernel principal components analysis (SKPCA) feature extraction. Firstly, by fuzzy C-means clustering, some samples are selected from the training sample set to constitute a sample subset. Then, the obtained samples subset is used to execute SKPCA for extracting basic features of the training samples. Finally, using the extracted basic features, the AWNN aerodynamic model is established. The experimental results show that, in 50 times repetitive modeling, the modeling ability of the method proposed is better than that of other six methods. It only needs about half the modeling time of KPCA-AWNN under a close prediction accuracy, and can easily determine the model parameters. This enables it to be effective and feasible to construct the aerodynamic modeling for flight vehicles.
文摘The purpose of objective and quantitative evaluating the organizational learning ability is to make the enterprise have reliable criterions and operable procedures during the process of improving the organizational learning ability and founding learning organization. In this paper, an evaluating indicator system is established by analyzing the whole process of organizational learning; both qualitative and quantitative analyses are used, and a new combined evaluating method is presented. A measurement case involving twenty enterprises is given to prove the validity of this method. In conclusion, learning strategies are presented according to measurement result. This paper applies 4 models synthetically. The evaluating effect is superior to other methods.
