This paper studies the coordinated planning of transmission tasks in the heterogeneous space networks to enable efficient sharing of ground stations cross satellite systems.Specifically,we first formulate the coordina...This paper studies the coordinated planning of transmission tasks in the heterogeneous space networks to enable efficient sharing of ground stations cross satellite systems.Specifically,we first formulate the coordinated planning problem into a mixed integer liner programming(MILP)problem based on time expanded graph.Then,the problem is transferred and reformulated into a consensus optimization framework which can be solved by satellite systems parallelly.With alternating direction method of multipliers(ADMM),a semi-distributed coordinated transmission task planning algorithm is proposed,in which each satellite system plans its own tasks based on local information and limited communication with the coordination center.Simulation results demonstrate that compared with the centralized and fully-distributed methods,the proposed semi-distributed coordinated method can strike a better balance among task complete rate,complexity,and the amount of information required to be exchanged.展开更多
There are many proposed optimal or suboptimal al- gorithms to update out-of-sequence measurement(s) (OoSM(s)) for linear-Gaussian systems, but few algorithms are dedicated to track a maneuvering target in clutte...There are many proposed optimal or suboptimal al- gorithms to update out-of-sequence measurement(s) (OoSM(s)) for linear-Gaussian systems, but few algorithms are dedicated to track a maneuvering target in clutter by using OoSMs. In order to address the nonlinear OoSMs obtained by the airborne radar located on a moving platform from a maneuvering target in clut- ter, an interacting multiple model probabilistic data association (IMMPDA) algorithm with the OoSM is developed. To be practical, the algorithm is based on the Earth-centered Earth-fixed (ECEF) coordinate system where it considers the effect of the platform's attitude and the curvature of the Earth. The proposed method is validated through the Monte Carlo test compared with the perfor- mance of the standard IMMPDA algorithm ignoring the OoSM, and the conclusions show that using the OoSM can improve the track- ing performance, and the shorter the lag step is, the greater degree the performance is improved, but when the lag step is large, the performance is not improved any more by using the OoSM, which can provide some references for engineering application.展开更多
This paper proposes a deep learning(DL)resource allocation framework to achieve the harmonious coexistence between the transceiver pairs(TPs)and the Wi-Fi users in LTE-U networks.The nonconvex resource allocation is c...This paper proposes a deep learning(DL)resource allocation framework to achieve the harmonious coexistence between the transceiver pairs(TPs)and the Wi-Fi users in LTE-U networks.The nonconvex resource allocation is considered as a constrained learning problem and the deep neural network(DNN)is employed to approximate the optimal resource allocation decisions through unsupervised manner.A parallel DNN framework is proposed to deal with the two optimization variables in this problem,where one is the licensed power allocation unit and the other is the unlicensed time fraction occupied unit.Besides,to guarantee the feasibility of the proposed algorithm,the Lagrange dual method is used to relax the constraints into the DNN training process.Then,the dual variable and the DNN parameter are alternating update via the batch-based gradient decent method until the training process converges.Numerical results show that the proposed algorithm is feasible and has better performance than other general algorithms.展开更多
Objective: The incidence and mortality of lung cancer in people over 70 years were increased in the past 10 years. We defined age 70 years as boundary line of the elderly patients in lung cancer and analyzed and ident...Objective: The incidence and mortality of lung cancer in people over 70 years were increased in the past 10 years. We defined age 70 years as boundary line of the elderly patients in lung cancer and analyzed and identified the factors affecting prognosis. Methods: A retrospective study had enrolled 408 cases of lung cancer aged over 70 years old and SPSS13.0 software was used in univariate analysis and COX regression analysis to analyze factors affecting prognosis, such as gender, age, complications, symptoms, pathological type, clinical stage, effusion, surgery, radiotherapy, chemotherapy and so on. Results: In univariate analysis, symptoms, stage, effusion, surgery, chemotherapy and chemotherapy cycles showed affecting prognosis significantly. In COX regression analysis, it showed that clinical stage (P = 0.000), surgery (P = 0.013), chemotherapy cycles (P = 0.001) were independent prognostic factors. Conclusion: Elderly lung cancer patients could be benefit from surgery and adjuvant chemotherapy while early stage. At late stage, their survival time may be prolonged when receive chemotherapy at least 4 cycles. Single-agent chemotherapy would be a good choice for elderly lung cancer. Effusion, particularly, pericardial effusion significantly influenced the prognosis, so that it should be effectively controlled.展开更多
The family of flaviviruses is one of the most medically important groups of emerging arthropod-borne viruses. Host cell cytoskeletons have been reported to have close contact with flaviviruses during virus entry, intr...The family of flaviviruses is one of the most medically important groups of emerging arthropod-borne viruses. Host cell cytoskeletons have been reported to have close contact with flaviviruses during virus entry, intracellular transport, replication, and egress process, although many detailed mechanisms are still unclear. This article provides a brief overview of the function of the most prominent flaviviruses-induced or-hijacked cytoskeletal structures including actin, microtubules and intermediate filaments, mainly focus on infection by dengue virus, Zika virus and West Nile virus. We suggest that virus interaction with host cytoskeleton to be an interesting area of future research.展开更多
Background and Aims:Chronic hepatitis B virus(HBV)infection is a serious health problem worldwide.Evaluating liver injury in patients with hepatitis B e antigen(HBeAg)-negative chronic hepatitis B(CHB)with detectable ...Background and Aims:Chronic hepatitis B virus(HBV)infection is a serious health problem worldwide.Evaluating liver injury in patients with hepatitis B e antigen(HBeAg)-negative chronic hepatitis B(CHB)with detectable HBV DNA and normal alanine aminotransferase(ALT)is crucial to guide their clinical management.We aimed to investigate the stages of liver inflammation and fibrosis as well as the predictive accuracy of gamma-glutamyl transpepti-dase-to-platelet ratio(GPR)in these patients.Methods:A total of 184 treatment-naïve HBeAg-negative CHB pa-tients with detectable HBV DNA and normal ALT were enrolled.The Scheuer scoring system was used to classify liver inflammation and fibrosis.Results:The distribution of patients with different liver inflammation grades were as follows:G0,0(0%);G1,97(52.7%);G2,68(37.0%);G3,12(6.5%);and G4,7(3.8%).The distribution of patients with different liver fibrosis stages were as follows:S0,22(12.0%);S1,72(39.1%);S2,42(22.8%);S3,19(10.3%);and S4,29(15.8%).The areas under the re-ceiver operating characteristic(AUROC)curves of GPR in predicting significant inflammation,severe inflammation,and advanced inflammation were 0.723,0.895,and 0.952,respectively.The accuracy of GPR was significantly superior to that of ALT in predicting liver inflammation.The AUROCs of GPR in predicting significant fibrosis,severe fibrosis,and cirrhosis were 0.691,0.780,and 0.803,respectively.The predictive accuracy of GPR was significantly higher than that of aminotransferase-to-platelet ratio index(APRI)and fibrosis index based on four factors(FIB-4)in identifying advanced fibrosis and cirrhosis,and it was superior to FIB-4 but comparable to APRI in identifying significant fibrosis.Conclusions:Nearly half of the HBeAg-negative CHB patients with detectable HBV DNA and normal ALT levels had significant liver inflammation or fibrosis.GPR can serve as an accurate predictor of liver inflammation and fibrosis in these patients.展开更多
In this study,ethanol production abilities of the novel carbon sources:sodium and calcium gluconate in different minimal and rich media were compared with glucose using Escherichia coli KO11.The strain produced higher...In this study,ethanol production abilities of the novel carbon sources:sodium and calcium gluconate in different minimal and rich media were compared with glucose using Escherichia coli KO11.The strain produced higher ethanol yield in the rich medium Luria-Bertani(LB)than the other two minimal media:corn steep liquor(CSL)and M9 for two substrates(sodium and calcium gluconate).Additionally,higher ethanol yields were achieved when the strain was grown in LB and M9 medium with calcium gluconate than sodium gluconate,while the ethanol yields were similar when both sodium and calcium gluconate were added into CSL medium respectively.Response surface methodology was used to optimize the fermentation medium components for enhancing ethanol production using strain E.coli KO11 in CSL medium with calcium gluconate as the substrate in batch culture.The concentration of the potassium phosphate buffer is the only significant factor among five factors considered.A quadratic model was developed to describe the relationship between ethanol production and the factors.The optimal conditions predicted for five factors were 14.38 g/L CSL,0.0398 g/L FeCl_(3)·6H2O,1.12 g/L MgSO_(4)·6H_(2)O,15.41 g/L(NH4)_(2)SO_(4),and 1.58/1.26 g/L KH_(2)PO_(4)/K_(2)HPO_(4)(2:1 molar ratio).The highest ethanol concentration under optimal conditions was 31.5 g/L,which was 5.6 g/L higher than that from the same fermentation concentration of calcium gluconate in LB media.The high correlation between the predicted and experimental values confirmed the validity of the model.展开更多
Patch clamp techniques were applied to investigating the regulation of the inward K^+channels in Vicia stomatal guard cells by cytoskeletal microtubules. The intracellular addition of either microtubule-disassembling ...Patch clamp techniques were applied to investigating the regulation of the inward K^+channels in Vicia stomatal guard cells by cytoskeletal microtubules. The intracellular addition of either microtubule-disassembling reagent amprophos-methyl (APM) or microtubule-stabilizing reagent taxol resulted in significant inhibition of the inward K^+ -currents across the plasma membranes of Vicia stomatal guard cells. The results suggest that the activation of the inward K^+channels in stomatal guard cells requires proper dynamic organization of cytoskeletal microtubules. The regulation of the inward K^+-channels in guard cells by microtubules may mediate the regulation of stomatal movements by cytoskeleton.展开更多
In this study,we extend traditional(single-target)hybrid systems to multi-target hybrid systems with a focus on the multi-maneuvering-target tracking system.This system consists of a continuous state,a discrete and sw...In this study,we extend traditional(single-target)hybrid systems to multi-target hybrid systems with a focus on the multi-maneuvering-target tracking system.This system consists of a continuous state,a discrete and switchable state,and a discrete,time-constant,and unique state.By defining a new generalized labeled multi-Bernoulli density,we prove that it is closed under the Chapman-Kolmogorov prediction and Bayes update for multi-target hybrid systems.In other words,we provide the exact derivation of a solution to this system,i.e.,the multi-model generalized labeled multi-Bemoulli filter,which has been developed without strict proof.展开更多
At 04∶50 on January 1,2021,a 36-year-old Chinese project manager(Case A),a 29-year-old Chinese worker(Case B),and a 53-year-old Chinese businessman(Case C)returned from Africa(Case A and B from South Africa and Case ...At 04∶50 on January 1,2021,a 36-year-old Chinese project manager(Case A),a 29-year-old Chinese worker(Case B),and a 53-year-old Chinese businessman(Case C)returned from Africa(Case A and B from South Africa and Case C from Lesotho)on the same flight and tested coronavirus disease 2019(COVID-19)RNA positive by real-time polymerase chain reaction(PCR)by Baoan District People’s Hospital.Shenzhen CDC received their oral nasopharyngeal swabs packages from the hospital and retested COVID-19 RNA positive at 09∶50.Meanwhile,Case D.展开更多
In space information networks,resource mobility is an important factor affecting the network performance,which not only results in challenges in resource management but also brings opportunities to the improvement of ...In space information networks,resource mobility is an important factor affecting the network performance,which not only results in challenges in resource management but also brings opportunities to the improvement of network service capability.In order to explore the restriction and improvement mechanism of resource mobility on network performance,we firstly use the time-expanded resource relationship graph to represent the moving behavior of multidimensional resources and the collaborative relationship between different resources.Then by jointly considering the number of disjoint resource combinations,the length of moving time window,and the parameter of resource independence,we propose(k,n,L)degree of freedom on resource combination as a metric measuring performance gain resulted from resource mobility.Furthermore,the analysis of resource mobility is transformed into the problem of finding disjoint paths in the graph,and the tradeoff relationship between QoS requirements of task and resource mobility utilization is discussed.Finally,the tradeoff between the gain of resource mobility utilization and the payment of service process delay is revealed through simulation.展开更多
We investigate the squeezed back-to-back correlations(BBC) of K^+K^-, caused by the mass modification of particles in the dense medium formed in d + Au collisions at √sNN= 200 GeV and Au + Au collisions at √sNN= 62....We investigate the squeezed back-to-back correlations(BBC) of K^+K^-, caused by the mass modification of particles in the dense medium formed in d + Au collisions at √sNN= 200 GeV and Au + Au collisions at √sNN= 62.4 GeV. Considering that some kaons may not be affected by the medium, we further study the BBC functions of K+K-when parts of all kaons have a mass-shift. Our results indicate that the BBC functions of K+K-can be observed when only ~10% of all kaons have a mass-shift in d + Au collisions at √sNN = 200 GeV and the peripheral collisions of Au + Au at √sNN= 62.4 GeV. Since the BBC function is caused by the mass-shift due to the interactions between the particle and the medium, the successful detection of the BBC function indirectly marks that the dense medium has formed in these collision systems. We suggest the experimental measurement of the BBC function of K^+K^- in d + Au collisions at √sNN = 200 GeV and peripheral collisions of Au + Au at √sNN= 62.4 GeV.展开更多
Dear Editor,Developing a variant-specific vaccine has drawn great concern due to the considerably altered antigenicity and immune evasion of the Omicron variant.Several recent studies have evaluated the immunogenicity...Dear Editor,Developing a variant-specific vaccine has drawn great concern due to the considerably altered antigenicity and immune evasion of the Omicron variant.Several recent studies have evaluated the immunogenicity of Omicron-based mRNA vaccines for both regular and booster vaccination and compared it with the wildtype(WT)SARS-CoV-2 counterpart in animal models.展开更多
Frontiers in Biology,an international peer-reviewed scientific journal to be published bi-monthly,is launched today.It is jointly published by Higher Education Press and Springer.
In this paper,a resource mobility aware two-stage hybrid task planning algorithm is proposed to reduce the resource conflict between emergency tasks and the common tasks,so as to improve the overall performance of spa...In this paper,a resource mobility aware two-stage hybrid task planning algorithm is proposed to reduce the resource conflict between emergency tasks and the common tasks,so as to improve the overall performance of space information networks.Specifically,in the common task planning stage,a resource fragment avoidance task planning algorithm is proposed,which reduces the contention between emergency tasks and the planned common tasks in the next stage by avoiding the generation of resource fragments.For emergency tasks,we design a metric to quantify the revenue of the candidate resource combination of emergency tasks,which considers both the priority of the tasks and the impact on the planned common tasks.Based on this,a resource mobility aware emergency task planning algorithm is proposed,which strikes a good balance between improving the sum priority and avoiding disturbing the planned common tasks.Finally,simulation results show that the proposed algorithm is superior to the existing algorithms in both the sum task priority and the task completion rate.展开更多
基金supported in part by the NSF China under Grant(61701365,61801365,62001347)in part by Natural Science Foundation of Shaanxi Province(2020JQ-686)+4 种基金in part by the China Postdoctoral Science Foundation under Grant(2018M643581,2019TQ0210,2019TQ0241,2020M673344)in part by Young Talent fund of University Association for Science and Technology in Shaanxi,China(20200112)in part by Key Research and Development Program in Shaanxi Province of China(2021GY066)in part by Postdoctoral Foundation in Shaanxi Province of China(2018BSHEDZZ47)the Fundamental Research Funds for the Central Universities。
文摘This paper studies the coordinated planning of transmission tasks in the heterogeneous space networks to enable efficient sharing of ground stations cross satellite systems.Specifically,we first formulate the coordinated planning problem into a mixed integer liner programming(MILP)problem based on time expanded graph.Then,the problem is transferred and reformulated into a consensus optimization framework which can be solved by satellite systems parallelly.With alternating direction method of multipliers(ADMM),a semi-distributed coordinated transmission task planning algorithm is proposed,in which each satellite system plans its own tasks based on local information and limited communication with the coordination center.Simulation results demonstrate that compared with the centralized and fully-distributed methods,the proposed semi-distributed coordinated method can strike a better balance among task complete rate,complexity,and the amount of information required to be exchanged.
基金supported by the National Natural Science Foundation of China(61102168)
文摘There are many proposed optimal or suboptimal al- gorithms to update out-of-sequence measurement(s) (OoSM(s)) for linear-Gaussian systems, but few algorithms are dedicated to track a maneuvering target in clutter by using OoSMs. In order to address the nonlinear OoSMs obtained by the airborne radar located on a moving platform from a maneuvering target in clut- ter, an interacting multiple model probabilistic data association (IMMPDA) algorithm with the OoSM is developed. To be practical, the algorithm is based on the Earth-centered Earth-fixed (ECEF) coordinate system where it considers the effect of the platform's attitude and the curvature of the Earth. The proposed method is validated through the Monte Carlo test compared with the perfor- mance of the standard IMMPDA algorithm ignoring the OoSM, and the conclusions show that using the OoSM can improve the track- ing performance, and the shorter the lag step is, the greater degree the performance is improved, but when the lag step is large, the performance is not improved any more by using the OoSM, which can provide some references for engineering application.
基金supported in part by the NSF China under Grant(61801365,61701365,61971327,61901319)in part by the China Postdoctoral Science Foundation under Grant(2018M643581,2018M633464,2019TQ0210,2019M663015)+5 种基金in part by Natural Science Foundation of Shaanxi Province(2019JQ-152,2020JQ-686)in part by Young Talent fund of University Association for Science and Technology in Shaanxi,China(20200112)in part by Natural Science Basic Research Plan in Shaanxi Province of China(2020JQ-328)in part by Natural Science Foundation of the Jiangsu Higher Education Institutions(19KJB510021)in part by Postdoctoral Foundation in Shaanxi Province of Chinathe Fundamental Research Funds for the Central Universities.
文摘This paper proposes a deep learning(DL)resource allocation framework to achieve the harmonious coexistence between the transceiver pairs(TPs)and the Wi-Fi users in LTE-U networks.The nonconvex resource allocation is considered as a constrained learning problem and the deep neural network(DNN)is employed to approximate the optimal resource allocation decisions through unsupervised manner.A parallel DNN framework is proposed to deal with the two optimization variables in this problem,where one is the licensed power allocation unit and the other is the unlicensed time fraction occupied unit.Besides,to guarantee the feasibility of the proposed algorithm,the Lagrange dual method is used to relax the constraints into the DNN training process.Then,the dual variable and the DNN parameter are alternating update via the batch-based gradient decent method until the training process converges.Numerical results show that the proposed algorithm is feasible and has better performance than other general algorithms.
文摘Objective: The incidence and mortality of lung cancer in people over 70 years were increased in the past 10 years. We defined age 70 years as boundary line of the elderly patients in lung cancer and analyzed and identified the factors affecting prognosis. Methods: A retrospective study had enrolled 408 cases of lung cancer aged over 70 years old and SPSS13.0 software was used in univariate analysis and COX regression analysis to analyze factors affecting prognosis, such as gender, age, complications, symptoms, pathological type, clinical stage, effusion, surgery, radiotherapy, chemotherapy and so on. Results: In univariate analysis, symptoms, stage, effusion, surgery, chemotherapy and chemotherapy cycles showed affecting prognosis significantly. In COX regression analysis, it showed that clinical stage (P = 0.000), surgery (P = 0.013), chemotherapy cycles (P = 0.001) were independent prognostic factors. Conclusion: Elderly lung cancer patients could be benefit from surgery and adjuvant chemotherapy while early stage. At late stage, their survival time may be prolonged when receive chemotherapy at least 4 cycles. Single-agent chemotherapy would be a good choice for elderly lung cancer. Effusion, particularly, pericardial effusion significantly influenced the prognosis, so that it should be effectively controlled.
基金supported by Collaborative Research Grant (KLMVI-OP-201904) of CAS Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciencesthe starting Grant of Institut Pasteur of Shanghai (1185170000), Chinese Academy of Sciences
文摘The family of flaviviruses is one of the most medically important groups of emerging arthropod-borne viruses. Host cell cytoskeletons have been reported to have close contact with flaviviruses during virus entry, intracellular transport, replication, and egress process, although many detailed mechanisms are still unclear. This article provides a brief overview of the function of the most prominent flaviviruses-induced or-hijacked cytoskeletal structures including actin, microtubules and intermediate filaments, mainly focus on infection by dengue virus, Zika virus and West Nile virus. We suggest that virus interaction with host cytoskeleton to be an interesting area of future research.
基金funded by the National Natural Science Foundation of China(82002133)Jiangsu Provincial Medical Innovation Team(CXTDA2017005)+4 种基金Nanjing Medical Science,Technique Development Foundation(QRX17121)Yangzhou Key R&D Program(Social Development)(YZ2020101)China Postdoctoral Science Foundation for COVID-19(2020T130049ZX)Natural Science Foundation of Jiangsu Province for Young Scholars(BK20200266)Foundation Project of Jiangsu Commission of Health(Q2017003).
文摘Background and Aims:Chronic hepatitis B virus(HBV)infection is a serious health problem worldwide.Evaluating liver injury in patients with hepatitis B e antigen(HBeAg)-negative chronic hepatitis B(CHB)with detectable HBV DNA and normal alanine aminotransferase(ALT)is crucial to guide their clinical management.We aimed to investigate the stages of liver inflammation and fibrosis as well as the predictive accuracy of gamma-glutamyl transpepti-dase-to-platelet ratio(GPR)in these patients.Methods:A total of 184 treatment-naïve HBeAg-negative CHB pa-tients with detectable HBV DNA and normal ALT were enrolled.The Scheuer scoring system was used to classify liver inflammation and fibrosis.Results:The distribution of patients with different liver inflammation grades were as follows:G0,0(0%);G1,97(52.7%);G2,68(37.0%);G3,12(6.5%);and G4,7(3.8%).The distribution of patients with different liver fibrosis stages were as follows:S0,22(12.0%);S1,72(39.1%);S2,42(22.8%);S3,19(10.3%);and S4,29(15.8%).The areas under the re-ceiver operating characteristic(AUROC)curves of GPR in predicting significant inflammation,severe inflammation,and advanced inflammation were 0.723,0.895,and 0.952,respectively.The accuracy of GPR was significantly superior to that of ALT in predicting liver inflammation.The AUROCs of GPR in predicting significant fibrosis,severe fibrosis,and cirrhosis were 0.691,0.780,and 0.803,respectively.The predictive accuracy of GPR was significantly higher than that of aminotransferase-to-platelet ratio index(APRI)and fibrosis index based on four factors(FIB-4)in identifying advanced fibrosis and cirrhosis,and it was superior to FIB-4 but comparable to APRI in identifying significant fibrosis.Conclusions:Nearly half of the HBeAg-negative CHB patients with detectable HBV DNA and normal ALT levels had significant liver inflammation or fibrosis.GPR can serve as an accurate predictor of liver inflammation and fibrosis in these patients.
基金California Energy Commission grant(55779A/08-03).
文摘In this study,ethanol production abilities of the novel carbon sources:sodium and calcium gluconate in different minimal and rich media were compared with glucose using Escherichia coli KO11.The strain produced higher ethanol yield in the rich medium Luria-Bertani(LB)than the other two minimal media:corn steep liquor(CSL)and M9 for two substrates(sodium and calcium gluconate).Additionally,higher ethanol yields were achieved when the strain was grown in LB and M9 medium with calcium gluconate than sodium gluconate,while the ethanol yields were similar when both sodium and calcium gluconate were added into CSL medium respectively.Response surface methodology was used to optimize the fermentation medium components for enhancing ethanol production using strain E.coli KO11 in CSL medium with calcium gluconate as the substrate in batch culture.The concentration of the potassium phosphate buffer is the only significant factor among five factors considered.A quadratic model was developed to describe the relationship between ethanol production and the factors.The optimal conditions predicted for five factors were 14.38 g/L CSL,0.0398 g/L FeCl_(3)·6H2O,1.12 g/L MgSO_(4)·6H_(2)O,15.41 g/L(NH4)_(2)SO_(4),and 1.58/1.26 g/L KH_(2)PO_(4)/K_(2)HPO_(4)(2:1 molar ratio).The highest ethanol concentration under optimal conditions was 31.5 g/L,which was 5.6 g/L higher than that from the same fermentation concentration of calcium gluconate in LB media.The high correlation between the predicted and experimental values confirmed the validity of the model.
文摘Patch clamp techniques were applied to investigating the regulation of the inward K^+channels in Vicia stomatal guard cells by cytoskeletal microtubules. The intracellular addition of either microtubule-disassembling reagent amprophos-methyl (APM) or microtubule-stabilizing reagent taxol resulted in significant inhibition of the inward K^+ -currents across the plasma membranes of Vicia stomatal guard cells. The results suggest that the activation of the inward K^+channels in stomatal guard cells requires proper dynamic organization of cytoskeletal microtubules. The regulation of the inward K^+-channels in guard cells by microtubules may mediate the regulation of stomatal movements by cytoskeleton.
基金Project supported by the National Natural Science Foundation of China(No.61601510)the Young Talent Support Project of China Association for Science and Technology(No.18-JCJQ-QT-008)。
文摘In this study,we extend traditional(single-target)hybrid systems to multi-target hybrid systems with a focus on the multi-maneuvering-target tracking system.This system consists of a continuous state,a discrete and switchable state,and a discrete,time-constant,and unique state.By defining a new generalized labeled multi-Bernoulli density,we prove that it is closed under the Chapman-Kolmogorov prediction and Bayes update for multi-target hybrid systems.In other words,we provide the exact derivation of a solution to this system,i.e.,the multi-model generalized labeled multi-Bemoulli filter,which has been developed without strict proof.
基金Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences(NO.2020-PT330-006)Shenzhen Key Medical Discipline Construction Fund(NO.SZXK064)+1 种基金Sanming Project of Medicine in Shenzhen(NO.SZSM 201811071)the China National Science and Technology Major Projects Foundation(NO.2017ZX10303406).
文摘At 04∶50 on January 1,2021,a 36-year-old Chinese project manager(Case A),a 29-year-old Chinese worker(Case B),and a 53-year-old Chinese businessman(Case C)returned from Africa(Case A and B from South Africa and Case C from Lesotho)on the same flight and tested coronavirus disease 2019(COVID-19)RNA positive by real-time polymerase chain reaction(PCR)by Baoan District People’s Hospital.Shenzhen CDC received their oral nasopharyngeal swabs packages from the hospital and retested COVID-19 RNA positive at 09∶50.Meanwhile,Case D.
基金supported by the National Natural Science Foundation of China(Nos.61701365,61801365,91638202,61725103)China Postdoctoral Science Foundation(Nos.2017M623121,2018M643581)Postdoctoral Foundation in Shaanxi Province of China,Fundamental Research Funds for the Central Universities。
文摘In space information networks,resource mobility is an important factor affecting the network performance,which not only results in challenges in resource management but also brings opportunities to the improvement of network service capability.In order to explore the restriction and improvement mechanism of resource mobility on network performance,we firstly use the time-expanded resource relationship graph to represent the moving behavior of multidimensional resources and the collaborative relationship between different resources.Then by jointly considering the number of disjoint resource combinations,the length of moving time window,and the parameter of resource independence,we propose(k,n,L)degree of freedom on resource combination as a metric measuring performance gain resulted from resource mobility.Furthermore,the analysis of resource mobility is transformed into the problem of finding disjoint paths in the graph,and the tradeoff relationship between QoS requirements of task and resource mobility utilization is discussed.Finally,the tradeoff between the gain of resource mobility utilization and the payment of service process delay is revealed through simulation.
基金Supported by the National Natural Science Foundation of China(11647166,11747155)the Natural Science Foundation of Inner Mongolia(2017BS0104)+1 种基金Changzhou Science and Technology Bureau(CJ20180054)the Foundation of Jiangsu University of Technology(KYY17028)
文摘We investigate the squeezed back-to-back correlations(BBC) of K^+K^-, caused by the mass modification of particles in the dense medium formed in d + Au collisions at √sNN= 200 GeV and Au + Au collisions at √sNN= 62.4 GeV. Considering that some kaons may not be affected by the medium, we further study the BBC functions of K+K-when parts of all kaons have a mass-shift. Our results indicate that the BBC functions of K+K-can be observed when only ~10% of all kaons have a mass-shift in d + Au collisions at √sNN = 200 GeV and the peripheral collisions of Au + Au at √sNN= 62.4 GeV. Since the BBC function is caused by the mass-shift due to the interactions between the particle and the medium, the successful detection of the BBC function indirectly marks that the dense medium has formed in these collision systems. We suggest the experimental measurement of the BBC function of K^+K^- in d + Au collisions at √sNN = 200 GeV and peripheral collisions of Au + Au at √sNN= 62.4 GeV.
基金supported by grants from the National Natural Science Foundation of China(32170936)the Emergency Key Program of Guangzhou Laboratory(EKPG22-02)National Science and Technology Major Project(2021YFC0863300 and 2021YFC2301800)。
文摘Dear Editor,Developing a variant-specific vaccine has drawn great concern due to the considerably altered antigenicity and immune evasion of the Omicron variant.Several recent studies have evaluated the immunogenicity of Omicron-based mRNA vaccines for both regular and booster vaccination and compared it with the wildtype(WT)SARS-CoV-2 counterpart in animal models.
文摘Frontiers in Biology,an international peer-reviewed scientific journal to be published bi-monthly,is launched today.It is jointly published by Higher Education Press and Springer.
基金supported by the National Natural Science Foundation of China(61701365,61801365 and 91638202)China Postdoctoral Science Foundation(2018M643581,2019TQ0241)+2 种基金National Natural Science Foundation of Shaanxi Province(2019JQ-152)Postdoctoral Foundation in Shaanxi Province of Chinathe Fundamental Research Funds for the Central Universities.
文摘In this paper,a resource mobility aware two-stage hybrid task planning algorithm is proposed to reduce the resource conflict between emergency tasks and the common tasks,so as to improve the overall performance of space information networks.Specifically,in the common task planning stage,a resource fragment avoidance task planning algorithm is proposed,which reduces the contention between emergency tasks and the planned common tasks in the next stage by avoiding the generation of resource fragments.For emergency tasks,we design a metric to quantify the revenue of the candidate resource combination of emergency tasks,which considers both the priority of the tasks and the impact on the planned common tasks.Based on this,a resource mobility aware emergency task planning algorithm is proposed,which strikes a good balance between improving the sum priority and avoiding disturbing the planned common tasks.Finally,simulation results show that the proposed algorithm is superior to the existing algorithms in both the sum task priority and the task completion rate.