In the environment of smart examination rooms, it is important to quickly and accurately detect abnormal behavior(human standing) for the construction of a smart campus. Based on deep learning, we propose an intellige...In the environment of smart examination rooms, it is important to quickly and accurately detect abnormal behavior(human standing) for the construction of a smart campus. Based on deep learning, we propose an intelligentstanding human detection (ISHD) method based on an improved single shot multibox detector to detect thetarget of standing human posture in the scene frame of exam room video surveillance at a specific examinationstage. ISHD combines the MobileNet network in a single shot multibox detector network, improves the posturefeature extractor of a standing person, merges prior knowledge, and introduces transfer learning in the trainingstrategy, which greatly reduces the computation amount, improves the detection accuracy, and reduces the trainingdifficulty. The experiment proves that the model proposed in this paper has a better detection ability for the smalland medium-sized standing human body posture in video test scenes on the EMV-2 dataset.展开更多
Nonlinear optics,which is a subject for studying the interaction between intense light and materials,has great impact on various research fields.Since many structures in biological tissues exhibit strong nonlinear opt...Nonlinear optics,which is a subject for studying the interaction between intense light and materials,has great impact on various research fields.Since many structures in biological tissues exhibit strong nonlinear optical effects,nonlinear optics has been widely applied in biomedical studies.Especially in the aspect of bio-imaging,nonlinear optical techniques can provide rapid,label-free and chemically specific imaging of biological samples,which enable the investigation of biological processes and analysis of samples beyond other microscopy techniques.In this review,we focus on the introduction of nonlinear optical processes and their applications in bio-imaging as well as the recent advances in this filed.Our perspective of this field is also presented.展开更多
With the development of the new detection methods and the function of fluorescent molecule,researchers hope to further explore the internal mechanisms of organisms,monitor changes in the intracellular microenvironment...With the development of the new detection methods and the function of fluorescent molecule,researchers hope to further explore the internal mechanisms of organisms,monitor changes in the intracellular microenvironment,and dynamic processes of molecular interactions in cells.Fluo-rescence resonance energy transfer(FRET)describes the energy transfer process between donor fluorescent molecules and acceptor fluorescent molecules.It is an important means to detect protein-protein interactions and protein conformation changes in cells.Fluorescence lifetime imaging microscopy(FLIM)enables noninvasive measurement of the fAuorescence lifetime of fluorescent particles in vivo.The FRET-FLIM technology,which is use FLIM to quantify and analyze FRET,enables real-time monitoring of dynamic changes of proteins in biological cells and analysis of protein interaction mechanisms.The distance between donor and acceptor and their respective fAuorescent lifetime,which are of great importance for studying the mechanism of intracellular activity can be obtained by data analysis and algorithm ftting.展开更多
The RUN domain Beclin-1-interacting cysteine-rich-containing(Rubicon)protein is involved in the maturation step of autophagy and the endocytic pathway as a Beclin-1-binding partner,but little is known regarding the ro...The RUN domain Beclin-1-interacting cysteine-rich-containing(Rubicon)protein is involved in the maturation step of autophagy and the endocytic pathway as a Beclin-1-binding partner,but little is known regarding the role of Rubicon during viral infection.Here,we performed functional studies of the identified target in interferon(IFN)signaling pathways associated with Rubicon to elucidate the mechanisms of viral resistance to IFN.The Rubicon protein levels were elevated in peripheral blood mononuclear cells,sera and liver tissues from patients with hepatitis B virus(HBV)infection relative to those in healthy individuals.Assays of the overexpression and knockdown of Rubicon showed that Rubicon significantly promoted HBV replication.In addition,Rubicon knockdown resulted in the inhibition of enterovirus 71,influenza A virus and vesicular stomatitis virus.The expression o0f Rubicon led to the suppression of virus-induced type-I interferon(IFN-αand IFN-β)and type-III interferon(IFN-λ1).Translocation of activated IRF3 and IRF7 from the cytoplasm to the nucleus was involved in this process,and the NF-κB essential modulator(NEMO),a key factor in the IFN pathway,was the target with which Rubicon interacted.Our results reveal a previously unrecognized function of Rubicon as a virus-induced protein that binds to NEMO,leading to the inhibition of type-I interferon production.Rubicon thus functions as an important negative regulator of the innate immune response,enhances viral replication and may play a role in viral immune evasion.展开更多
The unsteady flow separation of airfoil with a local flexible structure(LFS)is studied numerically in Lagrangian frames in detail,in order to investigate the nature of its high aerodynamic performance.For such aeroela...The unsteady flow separation of airfoil with a local flexible structure(LFS)is studied numerically in Lagrangian frames in detail,in order to investigate the nature of its high aerodynamic performance.For such aeroelastic system,the characteristicbased split(CBS)scheme combined with arbitrary Lagrangian-Eulerian(ALE)framework is developed firstly for the numerical analysis of unsteady flow,and Galerkin method is used to approach the flexible structure.The local flexible skin of airfoil,which can lead to self-induced oscillations,is considered as unsteady perturbation to the flow.Then,the ensuing high aerodynamic performances and complex unsteady flow separation at low Reynolds number are studied by Lagrangian coherent structures(LCSs).The results show that the LFS has a significant influence on the unsteady flow separation,which is the key point for the lift enhancement.Specifically,the oscillations of the LFS can induce the generations of moving separation and vortex,which can enhance the kinetic energy transport from main flow to the boundary layer.The results could give a deep understand of the dynamics in unsteady flow separation and flow control for the flow over airfoil.展开更多
基金supported by the Natural Science Foundation of China 62102147National Science Foundation of Hunan Province 2022JJ30424,2022JJ50253,and 2022JJ30275+2 种基金Scientific Research Project of Hunan Provincial Department of Education 21B0616 and 21B0738Hunan University of Arts and Sciences Ph.D.Start-Up Project BSQD02,20BSQD13the Construct Program of Applied Characteristic Discipline in Hunan University of Science and Engineering.
文摘In the environment of smart examination rooms, it is important to quickly and accurately detect abnormal behavior(human standing) for the construction of a smart campus. Based on deep learning, we propose an intelligentstanding human detection (ISHD) method based on an improved single shot multibox detector to detect thetarget of standing human posture in the scene frame of exam room video surveillance at a specific examinationstage. ISHD combines the MobileNet network in a single shot multibox detector network, improves the posturefeature extractor of a standing person, merges prior knowledge, and introduces transfer learning in the trainingstrategy, which greatly reduces the computation amount, improves the detection accuracy, and reduces the trainingdifficulty. The experiment proves that the model proposed in this paper has a better detection ability for the smalland medium-sized standing human body posture in video test scenes on the EMV-2 dataset.
基金the National Natural Science Foundation of China(61722508/61525503/61620106016/61835009/61935012/61961136005)(Key)Project of Department of Education of Guangdong Province(2016KCXTD007)Shenzhen Basic Research Project(JCYJ20180305124902165).
文摘Nonlinear optics,which is a subject for studying the interaction between intense light and materials,has great impact on various research fields.Since many structures in biological tissues exhibit strong nonlinear optical effects,nonlinear optics has been widely applied in biomedical studies.Especially in the aspect of bio-imaging,nonlinear optical techniques can provide rapid,label-free and chemically specific imaging of biological samples,which enable the investigation of biological processes and analysis of samples beyond other microscopy techniques.In this review,we focus on the introduction of nonlinear optical processes and their applications in bio-imaging as well as the recent advances in this filed.Our perspective of this field is also presented.
基金supported by the National Natural Science Foundation of China(61722508/61525503/61620106016/81727804)The National Key Research and Development Program of China(2017YFA0700402)+1 种基金Guangdong Natural Science Foundation Innovation Team(2014A030312008)Shenzhen Basic Research Project(JCYJ20150930104948169/JCYJ20160328144746940/GJHZ20160226202139185/JCYJ20170412105003520)。
文摘With the development of the new detection methods and the function of fluorescent molecule,researchers hope to further explore the internal mechanisms of organisms,monitor changes in the intracellular microenvironment,and dynamic processes of molecular interactions in cells.Fluo-rescence resonance energy transfer(FRET)describes the energy transfer process between donor fluorescent molecules and acceptor fluorescent molecules.It is an important means to detect protein-protein interactions and protein conformation changes in cells.Fluorescence lifetime imaging microscopy(FLIM)enables noninvasive measurement of the fAuorescence lifetime of fluorescent particles in vivo.The FRET-FLIM technology,which is use FLIM to quantify and analyze FRET,enables real-time monitoring of dynamic changes of proteins in biological cells and analysis of protein interaction mechanisms.The distance between donor and acceptor and their respective fAuorescent lifetime,which are of great importance for studying the mechanism of intracellular activity can be obtained by data analysis and algorithm ftting.
基金the supporting of special funding for the PhD students of Wuhan University short-term study abroadsupported by research grants from the Major State Basic Research Development Program of China(2013CB911102)the National Natural Science Foundation of China(81461130019,81271821 and 31570870).
文摘The RUN domain Beclin-1-interacting cysteine-rich-containing(Rubicon)protein is involved in the maturation step of autophagy and the endocytic pathway as a Beclin-1-binding partner,but little is known regarding the role of Rubicon during viral infection.Here,we performed functional studies of the identified target in interferon(IFN)signaling pathways associated with Rubicon to elucidate the mechanisms of viral resistance to IFN.The Rubicon protein levels were elevated in peripheral blood mononuclear cells,sera and liver tissues from patients with hepatitis B virus(HBV)infection relative to those in healthy individuals.Assays of the overexpression and knockdown of Rubicon showed that Rubicon significantly promoted HBV replication.In addition,Rubicon knockdown resulted in the inhibition of enterovirus 71,influenza A virus and vesicular stomatitis virus.The expression o0f Rubicon led to the suppression of virus-induced type-I interferon(IFN-αand IFN-β)and type-III interferon(IFN-λ1).Translocation of activated IRF3 and IRF7 from the cytoplasm to the nucleus was involved in this process,and the NF-κB essential modulator(NEMO),a key factor in the IFN pathway,was the target with which Rubicon interacted.Our results reveal a previously unrecognized function of Rubicon as a virus-induced protein that binds to NEMO,leading to the inhibition of type-I interferon production.Rubicon thus functions as an important negative regulator of the innate immune response,enhances viral replication and may play a role in viral immune evasion.
基金the National Fundamental Research Program of China(973 Program),No.2012CB026002the National High Technology Research Program of China(863 Program),No.2012AA052303.
文摘The unsteady flow separation of airfoil with a local flexible structure(LFS)is studied numerically in Lagrangian frames in detail,in order to investigate the nature of its high aerodynamic performance.For such aeroelastic system,the characteristicbased split(CBS)scheme combined with arbitrary Lagrangian-Eulerian(ALE)framework is developed firstly for the numerical analysis of unsteady flow,and Galerkin method is used to approach the flexible structure.The local flexible skin of airfoil,which can lead to self-induced oscillations,is considered as unsteady perturbation to the flow.Then,the ensuing high aerodynamic performances and complex unsteady flow separation at low Reynolds number are studied by Lagrangian coherent structures(LCSs).The results show that the LFS has a significant influence on the unsteady flow separation,which is the key point for the lift enhancement.Specifically,the oscillations of the LFS can induce the generations of moving separation and vortex,which can enhance the kinetic energy transport from main flow to the boundary layer.The results could give a deep understand of the dynamics in unsteady flow separation and flow control for the flow over airfoil.
