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您的检索式：作者名="Kaixin Cheng"
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| 1 | DCGAN Based Spectrum Sensing Data Enhancement for Behavior Recognition in Self-Organized Communication Network显示文摘Communication behavior recognition is an issue with increasingly importance in the antiterrorism and national defense area.However,the sensing data obtained in actual environment is often not sufficient to accurately analyze the communication behavior.Traditional means can hardly utilize the scarce and crude spectrum sensing data captured in a real scene.Thus,communication behavior recognition using raw sensing data under smallsample condition has become a new challenge.In this paper,a data enhanced communication behavior recognition(DECBR)scheme is proposed to meet this challenge.Firstly,a preprocessing method is designed to make the raw spectrum data suitable for the proposed scheme.Then,an adaptive convolutional neural network structure is exploited to carry out communication behavior recognition.Moreover,DCGAN is applied to support data enhancement,which realize communication behavior recognition under small-sample condition.Finally,the scheme is verified by experiments under different data size.The results show that the DECBR scheme can greatly improve the accuracy and efficiency of behavior recognition under smallsample condition. | Kaixin Cheng Lei Zhu Changhua Yao Lu Yu Xinrong Wu Xiang Zheng Lei Wang Fandi Lin | 2021 | China Communications2021，18，11： | 3 |
| 2 | New discrete element models for elastoplastic problems显示文摘The discrete element method (DEM) has attractivefeatures for problems with severe damages, but lack oftheoretical basis for continua behavior especially for nonlinearbehavior has seriously restricted its application.The present study proposes a new approach to developingthe DEM as a general and robust technique for modeling theelastoplastic behavior of solid materials. New types of connectivelinks between elements are proposed, the inter-elementparameters are theoretically determined based onthe principle of energy equivalence and a yield criterion anda flow rule for DEM are given for describing nonlinear behaviorof materials. Moreover, a numerical scheme, which canbe applied to modeling the behavior of a continuum as wellas the transformation from a continuum to a discontinuum,is obtained by introducing a fracture criterion and a contactmodel into the DEM. The elastoplastic stress wave propagationsand the tensile failure process of a steel plate aresimulated, and the numerical results agree well with thoseobtained from the finite element method (FEM) and correspondingexperiment, and thus the accuracy and efficiencyof the DEM scheme are demonstrated. | Ming Cheng Weifu Liu Kaixin Liu LTCS and Department of Mechanics and Aerospace Engineering,College of Engineering, Peking University, 100871 Beijing, China | 2009 | Acta Mechanica Sinica2009，25，5： | 2 |
| 3 | Analyzing the cellular and molecular atlas of ovarian mesenchymal cells provides a strategy against female reproductive aging显示文摘Ovarian mesenchymal cells(oMCs)constitute a distinct microenvironment that supports folliculogenesis under physiological conditions.Supplementation of exogenous non-ovarian mesenchymal-related cells has been reported to be an efficient approach to improve ovarian functions.However,the development and cellular and molecular characteristics of endogenous oMCs remain largely unexplored.In this study,we surveyed the single-cell transcriptomic landscape to dissect the cellular and molecular changes associated with the aging of oMCs in mice.Our results showed that the oMCs were composed of five ovarian differentiatedMC(odMC)populations and one ovarian mesenchymal progenitor(oMP)cell population.These cells could differentiate into various odMCs via an oMP-derived route to construct the ovarian stroma structures.Comparative analysis revealed that ovarian aging was associated with decreased quantity of oMP cells and reduced quality of odMCs.Based on the findings of bioinformatics analysis,we designed different strategies involving supplementation with young oMCs to examine their effects on female fertility and health.Our functional investigations revealed that oMCs supplementation prior to ovarian senescence was the optimal method to improve female fertility and extend the reproductive lifespan of aged females in the longterm. | Longzhong Jia Wenji Wang Jing Liang Shudong Niu Yibo Wang Jian Yang Lingyu Li Ge Wang Xueqiang Xu Lu Mu Kaixin Cheng Xuebing Yang Yijing Wang Haoshu Luo Guoliang Xia Yuwen Ke Yan Zhang Hua Zhang | 2023 | Science China(Life Sciences)2023，66，12： | 0 |
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