Aiming at the topic of electroencephalogram （EEG） pattern recognition in brain computer interface （BCI）, a classification method based on probabilistic neural network （PNN） with supervised learning is presented ...Aiming at the topic of electroencephalogram （EEG） pattern recognition in brain computer interface （BCI）, a classification method based on probabilistic neural network （PNN） with supervised learning is presented in this paper. It applies the recognition rate of training samples to the learning progress of network parameters. The learning vector quantization is employed to group training samples and the Genetic algorithm （GA） is used for training the network＇ s smoothing parameters and hidden central vector for detemlining hidden neurons. Utilizing the standard dataset I （a） of BCI Competition 2003 and comparing with other classification methods, the experiment results show that the best performance of pattern recognition Js got in this way, and the classification accuracy can reach to 93.8%, which improves over 5% compared with the best result （88.7 % ） of the competition. This technology provides an effective way to EEG classification in practical system of BCI.展开更多
This thesis reports the impact of strategies-based instruction on reading comprehension. In the study, 76 intermediate EFL students of non-English major were either participants in a strategies-based instruction treat...This thesis reports the impact of strategies-based instruction on reading comprehension. In the study, 76 intermediate EFL students of non-English major were either participants in a strategies-based instruction treatment or were comparison students receiving regular language course. Both groups filled out a pre-treatment learning strategy questionnaire and then performed a pre-test and a post-test. The data looked for links between strategy training and reading proficiency. The findings indicated significant improvements in students' reading comprehension as a result of the strategies-based instruction program. Another finding was that the strategy intervention had an effect on the improvement of students' ability to understand main ideas and make inferences from given passages.展开更多
基金Supported by the National Natural Science Foundation of China (No. 30570485)the Shanghai "Chen Guang" Project (No. 09CG69).
文摘Aiming at the topic of electroencephalogram （EEG） pattern recognition in brain computer interface （BCI）, a classification method based on probabilistic neural network （PNN） with supervised learning is presented in this paper. It applies the recognition rate of training samples to the learning progress of network parameters. The learning vector quantization is employed to group training samples and the Genetic algorithm （GA） is used for training the network＇ s smoothing parameters and hidden central vector for detemlining hidden neurons. Utilizing the standard dataset I （a） of BCI Competition 2003 and comparing with other classification methods, the experiment results show that the best performance of pattern recognition Js got in this way, and the classification accuracy can reach to 93.8%, which improves over 5% compared with the best result （88.7 % ） of the competition. This technology provides an effective way to EEG classification in practical system of BCI.
文摘This thesis reports the impact of strategies-based instruction on reading comprehension. In the study, 76 intermediate EFL students of non-English major were either participants in a strategies-based instruction treatment or were comparison students receiving regular language course. Both groups filled out a pre-treatment learning strategy questionnaire and then performed a pre-test and a post-test. The data looked for links between strategy training and reading proficiency. The findings indicated significant improvements in students' reading comprehension as a result of the strategies-based instruction program. Another finding was that the strategy intervention had an effect on the improvement of students' ability to understand main ideas and make inferences from given passages.
