为提升低空突防作战场景下分布式多输入多输出(Multiple Input and Multiple Output,MIMO)雷达系统的目标检测效能,提出一种合作博弈功率分配(Cooperative Game Power Allocation,CGPA)算法。基于带误差的支援信息建立了低空多径环境下...为提升低空突防作战场景下分布式多输入多输出(Multiple Input and Multiple Output,MIMO)雷达系统的目标检测效能,提出一种合作博弈功率分配(Cooperative Game Power Allocation,CGPA)算法。基于带误差的支援信息建立了低空多径环境下的分布式MIMO雷达信号模型,并推导了基于奈曼皮尔逊准则的检测模型。结合Max-Min准则以信干噪比(Signal to Interference plus Noise Ratio,SINR)为优化模型的效用函数。在此基础上,利用加权方法简化了联盟利益Shapley值的计算,得到满足帕累托最优性和公平性的合作资源分配方案。通过对发射功率资源的细致化管理,有效减小多径效应引起接收信号幅度的参差与衰落。在改善接收信号的稳定性的同时,挖掘并利用多径环境下丰富的散射特性,有效提升了雷达系统的探测效能。仿真实验验证了分布式MIMO雷达系统低空多径目标检测的出色性能,所提功率分配算法能够有效提升系统检测性能,并具有较好的实时性。展开更多
National parks as protected areas have been on the spotlight because they are essential in achieving ecological civilization in China.Despite the profound achievements of national parks to conserve nature,the benefits...National parks as protected areas have been on the spotlight because they are essential in achieving ecological civilization in China.Despite the profound achievements of national parks to conserve nature,the benefits of national parks for local residents remain lacking.Under the theory of harmonious coexistence between human and nature,this study focused on the development of local people’s livelihood in Qinghai’s national parks.We systematically explored the establishment of the national parks in Qinghai Province,analyzed the current prob-lems,and provided the main measures for developing people’s livelihood in protected areas in Qinghai.This study put forward the viewpoint that national parks should set a long-term goal,and gradually advance based on the environmental conditions and appropriately prioritize the improvement of local people’s wellbeing in the future.展开更多
Frontotemporal dementia(FTD) and amyotrophic lateral sclerosis(ALS) are neurodegenerative diseases that belong to the same disease spectrum,with overlapping of genetic and pathological features.Genetic mutations in TA...Frontotemporal dementia(FTD) and amyotrophic lateral sclerosis(ALS) are neurodegenerative diseases that belong to the same disease spectrum,with overlapping of genetic and pathological features.Genetic mutations in TARDBP,C9ORF72,MAPT,and GRN have been identified in these diseases.展开更多
BACKGROUND Obstructive sleep apnea hypoventilation syndrome(OSAHS)in children is a sleep respiratory disorder characterized by a series of pathophysiologic changes.Statistics in recent years have demonstrated an incre...BACKGROUND Obstructive sleep apnea hypoventilation syndrome(OSAHS)in children is a sleep respiratory disorder characterized by a series of pathophysiologic changes.Statistics in recent years have demonstrated an increasing yearly incidence.AIM To investigate the risk factors for OSAHS in children and propose appropriate management measures.METHODS This study had a case–control study design.Altogether,85 children with OSAHS comprised the case group,and healthy children of the same age and sex were matched at 1:1 as the control group.Basic information,including age,sex,height,weight and family history,and medical history data of all study participants were collected.Polysomnography was used to detect at least 8 h of nocturnal sleep.All participants were clinically examined for the presence of adenoids,enlarged tonsils,sinusitis,and rhinitis.RESULTS The analysis of variance revealed that the case group had a higher proportion of factors such as adenoid grading,tonsil indexing,sinusitis,and rhinitis than the control group.CONCLUSION A regression model was established,and glandular pattern grading,tonsil indexing,sinusitis,and pharyngitis were identified as independent risk factors affecting OSAHS development.展开更多
文摘为提升低空突防作战场景下分布式多输入多输出(Multiple Input and Multiple Output,MIMO)雷达系统的目标检测效能,提出一种合作博弈功率分配(Cooperative Game Power Allocation,CGPA)算法。基于带误差的支援信息建立了低空多径环境下的分布式MIMO雷达信号模型,并推导了基于奈曼皮尔逊准则的检测模型。结合Max-Min准则以信干噪比(Signal to Interference plus Noise Ratio,SINR)为优化模型的效用函数。在此基础上,利用加权方法简化了联盟利益Shapley值的计算,得到满足帕累托最优性和公平性的合作资源分配方案。通过对发射功率资源的细致化管理,有效减小多径效应引起接收信号幅度的参差与衰落。在改善接收信号的稳定性的同时,挖掘并利用多径环境下丰富的散射特性,有效提升了雷达系统的探测效能。仿真实验验证了分布式MIMO雷达系统低空多径目标检测的出色性能,所提功率分配算法能够有效提升系统检测性能,并具有较好的实时性。
基金This work was funded by the Second Tibetan Plateau Scientific Expe-dition and Research(STEP)program(Grant No.2019QZKK0501)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDA2002030302)+1 种基金Joint Grant from Chinese Academy of Sciences-People’s Government of Qinghai Province on Sanjiangyuan Na-tional Park(Grant No.LHZX-2020-01)Construction Fund for Qing-hai Key Laboratories(Grant No.2017-ZJ-Y23).
文摘National parks as protected areas have been on the spotlight because they are essential in achieving ecological civilization in China.Despite the profound achievements of national parks to conserve nature,the benefits of national parks for local residents remain lacking.Under the theory of harmonious coexistence between human and nature,this study focused on the development of local people’s livelihood in Qinghai’s national parks.We systematically explored the establishment of the national parks in Qinghai Province,analyzed the current prob-lems,and provided the main measures for developing people’s livelihood in protected areas in Qinghai.This study put forward the viewpoint that national parks should set a long-term goal,and gradually advance based on the environmental conditions and appropriately prioritize the improvement of local people’s wellbeing in the future.
文摘Frontotemporal dementia(FTD) and amyotrophic lateral sclerosis(ALS) are neurodegenerative diseases that belong to the same disease spectrum,with overlapping of genetic and pathological features.Genetic mutations in TARDBP,C9ORF72,MAPT,and GRN have been identified in these diseases.
文摘BACKGROUND Obstructive sleep apnea hypoventilation syndrome(OSAHS)in children is a sleep respiratory disorder characterized by a series of pathophysiologic changes.Statistics in recent years have demonstrated an increasing yearly incidence.AIM To investigate the risk factors for OSAHS in children and propose appropriate management measures.METHODS This study had a case–control study design.Altogether,85 children with OSAHS comprised the case group,and healthy children of the same age and sex were matched at 1:1 as the control group.Basic information,including age,sex,height,weight and family history,and medical history data of all study participants were collected.Polysomnography was used to detect at least 8 h of nocturnal sleep.All participants were clinically examined for the presence of adenoids,enlarged tonsils,sinusitis,and rhinitis.RESULTS The analysis of variance revealed that the case group had a higher proportion of factors such as adenoid grading,tonsil indexing,sinusitis,and rhinitis than the control group.CONCLUSION A regression model was established,and glandular pattern grading,tonsil indexing,sinusitis,and pharyngitis were identified as independent risk factors affecting OSAHS development.
