A continuous wavelet transform(CWT)and globallocal feature(GLF)extraction-based signal classificationalgorithm is proposed to improve the signal classification accuracy.First,the CWT is utilized to generate the timefr...A continuous wavelet transform(CWT)and globallocal feature(GLF)extraction-based signal classificationalgorithm is proposed to improve the signal classification accuracy.First,the CWT is utilized to generate the timefrequency scalogram.Then,the GLF extraction method is proposed to extract features from the time-frequency scalogram.Finally,a classification method based on the support vector machine(SVM)is proposed to classify the extracted features.Experimental results show that the extended binary phase shift keying(EBPSK)bit error rate(BER)of the proposed classification algorithm is1.3x10_5under the environment of additional white Gaussian noise with the signal-to-noise ratio of-3dB,which is24times lower than that of the SVM-based signal classification method.Meanwhile,the BER using the GLF extraction method is13times lower than the one using the global feature extraction method and24times lower than the one using the local feature extraction method.展开更多
Using the fuzzy cluster analysis and the temperature-salinity(T-S) similarity number analysis of cruise conductivity-temperature-depth(CTD) data in the upper layer(0–300 m) of the northern South China Sea(NSCS), we c...Using the fuzzy cluster analysis and the temperature-salinity(T-S) similarity number analysis of cruise conductivity-temperature-depth(CTD) data in the upper layer(0–300 m) of the northern South China Sea(NSCS), we classify the upper layer water of the NSCS into six water masses: diluted water(D), surface water(SS),the SCS subsurface water mass(U_S), the Pacific Ocean subsurface water mass(U_P), surface-subsurface mixed water(SU) and subsurface-intermediate mixed water(UI). A new stacked stereogram is used to illustrate the water mass distribution, and to examine the source and the distribution of U_P, combining with the sea surface height data and geostrophic current field. The results show that water mass U_P exists in all four seasons with the maximum range in spring and the minimum range in summer. In spring and winter, the U_P intrudes into the Luzon Strait and the southwest of Taiwan Island via the northern Luzon Strait in the form of nonlinear Rossby eddies, and forms a high temperature and high salinity zone east of the Dongsha Islands. In summer, the U_P is sporadically distributed in the study area. In autumn, the U_P is located in the upper 200 m layer east of Hainan Island.展开更多
Based on China National Standard of Soil Engineering Classification (GB/T 50145-2007) and the Unified Soil Classification System of American Society for Testing Materials (ASTM D-2478), two kinds of soil laboratory en...Based on China National Standard of Soil Engineering Classification (GB/T 50145-2007) and the Unified Soil Classification System of American Society for Testing Materials (ASTM D-2478), two kinds of soil laboratory engineering classification methods were discussed and analyzed from the aspects of the definition in particle fraction, classification of soil type and evaluation standard for soil gradation. There is a same limit of fine grains fraction in the two standards, and there are three main types of soil in GB/T 50145-2007 and two in ASTM D-2487. Different evaluation standards of gradation are put forward for gravels and sands in ASTM D-2487. Same criteria of A line, B line and controlling value of plastic index are in the plasticity chart of both standards.展开更多
The rough sets and Boolean reasoning based discretization approach (RSBRA) is no t suitable for feature selection for machine learning algorithms such as neural network or SVM because the information loss due to discr...The rough sets and Boolean reasoning based discretization approach (RSBRA) is no t suitable for feature selection for machine learning algorithms such as neural network or SVM because the information loss due to discretization is large. A mo dified RSBRA for feature selection was proposed and evaluated with SVM classifie rs. In the presented algorithm, the level of consistency, coined from the rough sets theory, is introduced to substitute the stop criterion of circulation of th e RSBRA, which maintains the fidelity of the training set after discretization. The experimental results show the modified algorithm has better predictive accur acy and less training time than the original RSBRA.展开更多
背景与目的:调强放射治疗可以明显提高鼻咽癌的局部控制率,使T分期的预后价值发生改变。本文拟评价接受调强放射治疗的鼻咽癌患者国际抗癌联盟(Union for International Cancer Control,UICC)第7版分期中T分期的预后价值,并对其简化方...背景与目的:调强放射治疗可以明显提高鼻咽癌的局部控制率,使T分期的预后价值发生改变。本文拟评价接受调强放射治疗的鼻咽癌患者国际抗癌联盟(Union for International Cancer Control,UICC)第7版分期中T分期的预后价值,并对其简化方式进行探讨。方法:回顾浙江省肿瘤医院放疗科2007年1月—2011年6月收治的641例初治鼻咽癌患者的基本资料,采用Kaplan-Meier法及COX回归评价UICC第7版分期中T分期的预后价值。结果:641例患者的5年总生存率(overall survival,OS)、无局部复发生存率(loco-relapse free survival,LRFS)、无进展生存率(progression-free survival,PFS)和无远处转移生存率(distant metastasis free survival,DMFS)分别为85.4%、88.5%、78%和87.1%,其中T_1、T_2、T_3和T_4分期患者的5年OS分别为91.6%、85.3%、90.1%和76.5%,LRFS为93%、85.3%、91.5%和84.4%,PFS为88.2%、77.3%、80.8%和70.9%,DMFS为95.1%、88.9%、88.2%和81.3%。其中T_1、T_2和T_3期的各指标间差异无统计学意义,而T_4期与T_1、T_2和T_3期之间多个预后指标差异均有统计学意义(P<0.05)。将T_1、T_2和T_3期合并为新T_1期,T_4期为新T_2期。新T_1和T_2期的5年OS为89.1%和76.5%(P=0.001);LRFS为90.1%和84.4%(P=0.028);PFS为81%和70.9%(P=0.001);DMFS为90.8%和81.2%(P=0.002),差异均有统计学意义。在不同的N分期中分别分析,简化的T分期仍有明显的预后预测优势。结论:在调强放射治疗时代,UICC第7版分期中的T分期之间的预后差异不明显,简化T分期能更好地适应治疗方法的改革和预测预后。展开更多
基金The National Key Technology R&D Program(No.2012BAH15B00)the Scientific Innovation Research of College Graduates in Jiangsu Province(No.KYLX150076)
文摘A continuous wavelet transform(CWT)and globallocal feature(GLF)extraction-based signal classificationalgorithm is proposed to improve the signal classification accuracy.First,the CWT is utilized to generate the timefrequency scalogram.Then,the GLF extraction method is proposed to extract features from the time-frequency scalogram.Finally,a classification method based on the support vector machine(SVM)is proposed to classify the extracted features.Experimental results show that the extended binary phase shift keying(EBPSK)bit error rate(BER)of the proposed classification algorithm is1.3x10_5under the environment of additional white Gaussian noise with the signal-to-noise ratio of-3dB,which is24times lower than that of the SVM-based signal classification method.Meanwhile,the BER using the GLF extraction method is13times lower than the one using the global feature extraction method and24times lower than the one using the local feature extraction method.
基金The National Natural Science Foundation of China under contract No.41776027the National Basic Research Program of China under contract Nos 2015CB954004 and 2009CB421208the Open Fund of the Key Laboratory of Ocean Circulation and Waves,Chinese Academy of Sciences under contract No.KLOCW1808
文摘Using the fuzzy cluster analysis and the temperature-salinity(T-S) similarity number analysis of cruise conductivity-temperature-depth(CTD) data in the upper layer(0–300 m) of the northern South China Sea(NSCS), we classify the upper layer water of the NSCS into six water masses: diluted water(D), surface water(SS),the SCS subsurface water mass(U_S), the Pacific Ocean subsurface water mass(U_P), surface-subsurface mixed water(SU) and subsurface-intermediate mixed water(UI). A new stacked stereogram is used to illustrate the water mass distribution, and to examine the source and the distribution of U_P, combining with the sea surface height data and geostrophic current field. The results show that water mass U_P exists in all four seasons with the maximum range in spring and the minimum range in summer. In spring and winter, the U_P intrudes into the Luzon Strait and the southwest of Taiwan Island via the northern Luzon Strait in the form of nonlinear Rossby eddies, and forms a high temperature and high salinity zone east of the Dongsha Islands. In summer, the U_P is sporadically distributed in the study area. In autumn, the U_P is located in the upper 200 m layer east of Hainan Island.
基金Supported by Projects of National Natural Science Foundation of China ( Nos. 40902077,41111120084,41172236)
文摘Based on China National Standard of Soil Engineering Classification (GB/T 50145-2007) and the Unified Soil Classification System of American Society for Testing Materials (ASTM D-2478), two kinds of soil laboratory engineering classification methods were discussed and analyzed from the aspects of the definition in particle fraction, classification of soil type and evaluation standard for soil gradation. There is a same limit of fine grains fraction in the two standards, and there are three main types of soil in GB/T 50145-2007 and two in ASTM D-2487. Different evaluation standards of gradation are put forward for gravels and sands in ASTM D-2487. Same criteria of A line, B line and controlling value of plastic index are in the plasticity chart of both standards.
基金National Key Fundamental Research Pro-ject of China (No.2002cb312200-01-3),National Natural Science Foundation ofChina (No.60174038) and Specialized Re-search Fund for the Doctoral Program ofHigher Education (No.20030248040)
文摘The rough sets and Boolean reasoning based discretization approach (RSBRA) is no t suitable for feature selection for machine learning algorithms such as neural network or SVM because the information loss due to discretization is large. A mo dified RSBRA for feature selection was proposed and evaluated with SVM classifie rs. In the presented algorithm, the level of consistency, coined from the rough sets theory, is introduced to substitute the stop criterion of circulation of th e RSBRA, which maintains the fidelity of the training set after discretization. The experimental results show the modified algorithm has better predictive accur acy and less training time than the original RSBRA.
文摘背景与目的:调强放射治疗可以明显提高鼻咽癌的局部控制率,使T分期的预后价值发生改变。本文拟评价接受调强放射治疗的鼻咽癌患者国际抗癌联盟(Union for International Cancer Control,UICC)第7版分期中T分期的预后价值,并对其简化方式进行探讨。方法:回顾浙江省肿瘤医院放疗科2007年1月—2011年6月收治的641例初治鼻咽癌患者的基本资料,采用Kaplan-Meier法及COX回归评价UICC第7版分期中T分期的预后价值。结果:641例患者的5年总生存率(overall survival,OS)、无局部复发生存率(loco-relapse free survival,LRFS)、无进展生存率(progression-free survival,PFS)和无远处转移生存率(distant metastasis free survival,DMFS)分别为85.4%、88.5%、78%和87.1%,其中T_1、T_2、T_3和T_4分期患者的5年OS分别为91.6%、85.3%、90.1%和76.5%,LRFS为93%、85.3%、91.5%和84.4%,PFS为88.2%、77.3%、80.8%和70.9%,DMFS为95.1%、88.9%、88.2%和81.3%。其中T_1、T_2和T_3期的各指标间差异无统计学意义,而T_4期与T_1、T_2和T_3期之间多个预后指标差异均有统计学意义(P<0.05)。将T_1、T_2和T_3期合并为新T_1期,T_4期为新T_2期。新T_1和T_2期的5年OS为89.1%和76.5%(P=0.001);LRFS为90.1%和84.4%(P=0.028);PFS为81%和70.9%(P=0.001);DMFS为90.8%和81.2%(P=0.002),差异均有统计学意义。在不同的N分期中分别分析,简化的T分期仍有明显的预后预测优势。结论:在调强放射治疗时代,UICC第7版分期中的T分期之间的预后差异不明显,简化T分期能更好地适应治疗方法的改革和预测预后。
