The probability-based covering algorithm(PBCA) is a new algorithm based on probability distribution. It decides, by voting, the class of the tested samples on the border of the coverage area, based on the probability ...The probability-based covering algorithm(PBCA) is a new algorithm based on probability distribution. It decides, by voting, the class of the tested samples on the border of the coverage area, based on the probability of training samples. When using the original covering algorithm(CA), many tested samples that are located on the border of the coverage cannot be classified by the spherical neighborhood gained. The network structure of PBCA is a mixed structure composed of both a feed-forward network and a feedback network. By using this method of adding some heterogeneous samples and enlarging the coverage radius,it is possible to decrease the number of rejected samples and improve the rate of recognition accuracy. Relevant computer experiments indicate that the algorithm improves the study precision and achieves reasonably good results in text classification.展开更多
Rock-fill dykes are often damaged caused by rapid flow currents in a mountainriver. Based on the relationship between the rock size on cover layer and its incipient velocity,it is found that rock weight is directly pr...Rock-fill dykes are often damaged caused by rapid flow currents in a mountainriver. Based on the relationship between the rock size on cover layer and its incipient velocity,it is found that rock weight is directly proportional to the 6th-9th power of incipient velocity,and 50% increase of the velocity may result in about 40 times increase of the rock weight.Therefore, it is inappropriate to improve the stability of rock-fill dykes by simply increasing therock weight. Some new measures should be used to reach this purpose.展开更多
基金supported by the Fund for Philosophy and Social Science of Anhui Provincethe Fund for Human and Art Social Science of the Education Department of Anhui Province(Grant Nos.AHSKF0708D13 and 2009sk038)
文摘The probability-based covering algorithm(PBCA) is a new algorithm based on probability distribution. It decides, by voting, the class of the tested samples on the border of the coverage area, based on the probability of training samples. When using the original covering algorithm(CA), many tested samples that are located on the border of the coverage cannot be classified by the spherical neighborhood gained. The network structure of PBCA is a mixed structure composed of both a feed-forward network and a feedback network. By using this method of adding some heterogeneous samples and enlarging the coverage radius,it is possible to decrease the number of rejected samples and improve the rate of recognition accuracy. Relevant computer experiments indicate that the algorithm improves the study precision and achieves reasonably good results in text classification.
文摘Rock-fill dykes are often damaged caused by rapid flow currents in a mountainriver. Based on the relationship between the rock size on cover layer and its incipient velocity,it is found that rock weight is directly proportional to the 6th-9th power of incipient velocity,and 50% increase of the velocity may result in about 40 times increase of the rock weight.Therefore, it is inappropriate to improve the stability of rock-fill dykes by simply increasing therock weight. Some new measures should be used to reach this purpose.
