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| 1 | Research on heart sound identification technology显示文摘In this article,both the basic principles and the experimental methods of identity recognition technology based on heart sounds are addressed.First,the characteristics of heart sounds and the feasibility of heart sounds as a biometric were analyzed.A synthetic model of heart sounds was then developed based on a family of wavelets;Finally,the characteristic parameters of heart sounds were extracted by using the heart sounds linear band frequency cepstra(HS-LBFC)with a specified configuration,and the similarity distance was adopted for heart sound identification.To highlight the difference in two heart sound signals between the time and frequency domains,a construction method of the heart sound wavelet,a calculation method of the parameters of a synthetic model,selection of the characteristic parameters of heart sounds and the corresponding data processing technology were examined.The experimental results showed that the proposed method exhibited excellent performance and practicability. | CHENG XieFeng MA Yong LIU Chen ZHANG XueJun GUO YuFeng | 2012 | Science China(Information Sciences)2012，55，2： | 20 |
| 2 | Brain Network Analysis of Schizophrenia Based on the Functional Connectivity显示文摘Network analysis based on graph theory has greatly promoted the cognition of the human brain network. A detailed brain network function connection analysis was carried out for the brain of normal human brain and mental illness patients. We studied the Magnetoencephalography(MEG) of 9 normal subjects and9 schizophrenics in left hemisphere temporal lobe and frontal lobe regions. And obtained the dynamic function connectivity matrix by calculating Pearson correlation coefficients that based on sliding time window and shorttime Fourier transform, and constructed weight and binary network by graph theory. Analyzed the small world properties of normal human brain networks, and compared the differences of network between normal subjects and patients with schizophrenia. | ZHANG Xuejun WANG Longqiang DING Yuhan HUANG Liya CHENG Xiefeng | 2019 | Chinese Journal of Electronics2019，28，3： | 3 |
| 3 | A New Cerebellar Control Scheme and Simulation Based on Kalman Estimator显示文摘 | ZHANG Shaobai RUAN Xiaogang CHENG Xiefeng | 2009 | Chinese Journal of Electronics2009，18，2： | 2 |
| 4 | Heart Sound recognition-a prospective candidate for biometric identification显示文摘 | Cheng Xiefeng Tao Yewei Huang Zhengjiang | | 0，，06： | 1 |
| 5 | Research on classification method of speech signal based on DIVA mod- el显示文摘 | ZHANG Shaobai XU Lei CHENG Xiefeng | 2012 | International Review on Computers and Software2012，7，6： | 1 |
| 6 | Research on heart sound identification technology 显示文摘 | CHENG Xiefeng MA Yong LIU Chen | 2012 | Science China Information Sci- ence2012，，42： | 1 |
| 7 | A Radar Fault Diagnosis Expert System Based on Lmproved CBR显示文摘 | cheng huizhong Cheng xiefeng | 2013 | Desing and Manufacture in Mechanical Engineering2013，432，6： | 1 |
| 8 | Root production, mortality and turnover in soil profiles as affected by clipping in a temperate grassland on the Loess Plateau显示文摘Aims Clipping or mowing for hay,as a prevalent land-use practice,is considered to be an important component of global change.Root production and turnover in response to clipping have great implications for the plant survival strategy and grassland ecosystem carbon processes.However,our knowledge about the clipping effect on root dynamics is mainly based on root living biomass,and limited by the lack of spatial and temporal observations.The study aim was to investigate the effect of clipping on seasonal variations in root length production and mortality and their distribution patterns in different soil layers in semiarid grassland on the Loess Plateau.Methods Clipping was performed once a year in June to mimic the local spring livestock grazing beginning from 2014.The minirhizotron technique was used to monitor the root production,mortality and turnover rate at various soil depths(0–10,10–20,20–30 and 30–50 cm)in 2014(from 30 May to 29 October)and 2015(from 22 April to 25 October).Soil temperature and moisture in different soil layers were also measured during the study period.Important Findings Our results showed that:(i)Clipping significantly decreased the cumulative root production(P<0.05)and increased the cumulative root mortality and turnover rates of the 0–50 cm soil profile for both years.(ii)Clipping induced an immediate and sharp decrease in root length production and an increase in root length mortality in all soil layers.However,with plant regrowth,root production increased and root mortality decreased gradually,with the root production at a depth of 30–50 cm even exceeding the control in September–October 2014 and April–May 2015.(iii)Clipping mainly reduced root length production and increased root length mortality in the upper 0–20 cm soil profile with rapid root turnover.However,roots at deeper soil layers were either little influenced by clipping or exhibited an opposite trend with slower turnover rate compared with the upper soil profile,leading to the downward transport of root production and living root biomass.These findings indicate that roots in deeper soil layers tend to favour higher root biomass and longer fine root life spans to maximize the water absorption efficiency under environmental stress,and also suggest that short-term clipping would reduce the amount of carbon through fine root litter into the soil,especially in the shallow soil profile. | Lin Wei Pengwei Yao Guanghua Jing Xiefeng Ye Jimin Cheng | 2019 | Journal of Plant Ecology2019，12，6： | 0 |
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