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Jiemei Zhao,Zhonghui Hu,Lijun Zhang 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.4
In this paper, a reliable H∞ controller is designed for discrete-time singular systems with infinite distributed delays. Firstly, a stability criterion is obtained based on linear matrix inequality (LMI). Then a controller is designed to ensure the singular time-delay system to be regular, causal and stable with disturbance attenuation level γ for possible actuator failures. A numerical example is given to illustrate the validity of the proposed approach.
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Exponential H∞ Control for Singular Systems with Time-varying Delay
Jiemei Zhao,Zhonghui Hu 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.4
This paper studies the exponential admissibility and H∞ control problems for a class of singular systemswith time-varying delay in state. Firstly, an exponential admissibility criterion is obtained based on linear matrixinequalities (LMIs). It is worth mentioning that the derivative of the time-varying delay does not need to be smallerthan one. Based on the proposed condition, a new delay-dependent H∞ controller is also given, which guaranteesthe admissibility and the H∞ performance g . Numerical examples are given to illustrate the effectiveness of theproposed method.
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Improved Results on Reachable Set Estimation of Linear Systems
Jiemei Zhao,Zhonghui Hu 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.5
In this study, we investigate the reachable set estimation for linear systems with discrete delay and distributeddelay as well as disturbances. Based on the reciprocally convex combination lemma, free-weighting matrixapproach and convex analysis technique, improved delay-dependent linear matrix inequalities (LMIs) criteria arederived for finding an ellipsoid to bound the reachable sets of such systems. Moreover, this result is extended to theone for linear systems with discrete delay, distributed delay and disturbances as well as polytopic-type uncertainties. In addition, the proposed results include some existing ones as special cases since the initial conditions of thesystems are not required to be zero. Finally, two numerical examples are provided to show that our results have lessconservative.
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The Phylogenetic Analysis of Camellia sinensis cv. Longjing 43
Xiaoqian Ye,Zhonghui Zhao,Lili Sun,Yue Xu,Hairong Xu 한국차학회 2015 한국차학회지 Vol.- No.S
In the recent years, researches in phylogeny and evolution based on the chloroplast genome attracted more and more attentions. The entire chloroplast genome of 13 species of typical core eudicots including Camellia sinensis cv. Longjing 43 was compared to analyze the genetic relationship in this study. 3 different methods were used to buildParsimony method. All the results showed that Longjing 43 and Ardisia polysticta have a closer relationship, with 100% support. Further researches should be done and more factors should be considered in phylogenetic analysis based on the complete chloroplast genome.
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Tian’ge Lu,Yao Yu,Zhonghui Zhao,Rongjuan Guo 대한신경정신의학회 2022 PSYCHIATRY INVESTIGATION Vol.19 No.1
Objective Adolescents are at a special stage of physical and mental development, which is a susceptible period for mental disorders. Since the outbreak of coronavirus pneumonia in December 2019, long term stress may have negative effects on the mental health of the adolescents. In the context of the coronavirus disease 2019 (COVID-19), the study was designed to investigate the mental and psychological health of adolescents in China and its possible related factors. Methods A cross-sectional study design was adopted using a structured questionnaire which were distributed through the Internet to measure depression, anxiety, life events and stress related factors. Descriptive statistics and multiple regression analyses were conducted to process the data. Results The final sample comprised 795 adolescents. The total detection rate of depression was 76.48% and the total detection rate of anxiety was 33.08%. ANOVA showed that there were significant differences in depression scores in terms of gender, anxiety scores, history of mental disorders, COVID-19 knowledge reserve, family and social contradictions (p<0.05). And there were significant differences in anxiety scores in terms of gender, depression scores, mental health knowledge reserves, family and social contradictions (p<0.05). Multiple regression analysis showed that anxiety score, health status and COVID-19 knowledge reserve were positively associated with depression score (p<0.01), and history of psychosocial disorders was negatively associated with depression score (p<0.05); depression score, family and social contradictions were significantly positively correlated with anxiety score (p<0.01), and history of mental disorders was significantly negatively correlated with SDS score (p<0.01). Conclusion During the outbreak of COVID-19, adolescent students with better understanding of the pandemic, more complete knowledge of mental health, and better family and social relationship had less impact on their mental health. Therefore, to ensure a sound social support system, elaborate health instruction, and family communication and mutual understanding are conducive to alleviating the psychological stress caused by the epidemic, and it is positive for adolescent students to maintain a good mental health.
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