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Cooperative formation control of multiple aerial vehicles based on guidance route in a complex task environment 认领 引用 被引量：12
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作者 Guibin SUN Rui ZHOU +4 位作者 Kun XU Zhi WENG Yuhang ZHANG Zhuoning DONG Yingxun WANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第2期701-720,共20页
In recent years,formation control of multi-agent has been a significant research subject in the field of cooperative control.However,previous works have mainly concentrated on formation control for simple point-mass m... In recent years,formation control of multi-agent has been a significant research subject in the field of cooperative control.However,previous works have mainly concentrated on formation control for simple point-mass model and linear model.In contrast,this paper presents a novel cooperative algorithm for multiple air vehicles formation control,which aims to devise a control strategy based on guidance route to achieve precisely coordinated formation control for a group of fixed-wing aircraft in a complex task environment.The proposed method introduces the leader-follower structure for effective organization of the multi-agent coordination.Moreover,the Partial Integrated Formation and Control(PIFC)is adopted to design the control law for Guidance-Route based Formation Control(GRFC).Additionally,the proposed approach designs two guidance-route generation strategies for two special situations to demonstrate the effectiveness of GRFC in complex task environments.Theoretical analysis reveals that the proposed control protocol for guidance command can ensure the overall stability and tracking accuracy of the system.Numerical simulations are performed to illustrate the theoretical results,and verify that the proposed approach can achieve coordinated formation control precisely in a complex task environment. 展开更多
关键词 Complex task environments Cooperative formation control Fixed-wing aircraft Guidance route Leader-follower structure Partial integrated formation and control
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Ethical Principles and Governance Technology Development of AI in China 认领 引用 被引量：18
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作者 Wenjun Wu Tiejun Huang Ke Gong 《Engineering》 SCIE EI CAS 2020年第3期302-309,共8页
Ethics and governance are vital to the healthy and sustainable development of artificial intelligence(AI).With the long-term goal of keeping AI beneficial to human society,governments,research organizations,and compan... Ethics and governance are vital to the healthy and sustainable development of artificial intelligence(AI).With the long-term goal of keeping AI beneficial to human society,governments,research organizations,and companies in China have published ethical guidelines and principles for AI,and have launched projects to develop AI governance technologies.This paper presents a survey of these efforts and highlights the preliminary outcomes in China.It also describes the major research challenges in AI governance research and discusses future research directions. 展开更多
关键词 AI ethical principles AI governance technology Machine learning Privacy Safety Fairness
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A study on key technologies of unmanned driving 认领 引用 被引量：19
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作者 Xinyu Zhang Hongbo Gao +3 位作者 Mu Guo Guopeng Li Yuchao Liu Deyi Li 《CAAI Transactions on Intelligence Technology》 2016年第1期4-13,共10页
Although the development of machine intelligence is far from simulating all the cognitive competence of our brains, still it is absolutely possible to peel the driving activity from people＇s cognitive activities and ... Although the development of machine intelligence is far from simulating all the cognitive competence of our brains, still it is absolutely possible to peel the driving activity from people＇s cognitive activities and then make the machine finish some low-level, complicated and lasting driving cognition by simulating our brains. The goal of driving is to replace drivers and free them from boring driving activities. Based on some studies on unmanned driving, this paper summarizes and analyzes the background, significance, research status and key technology of unmanned driving and the research group also introduces some research on brain cognition of driving and sensor placement of intelligent vehicles, which offers more meaningful reference to push the study of unmanned driving. 展开更多
关键词 Unmanned driving Brain cognition of driving Sensor placement Formalization of brain cognition
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Virtual Reality:A State-of-the-Art Survey 认领 引用 被引量：8
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作者 Ning-Ning Zhou Yu-Long Deng 《International Journal of Automation and computing》 2009年第4期319-325,共7页
This paper presents a survey on virtual reality systems and provides an in-depth understanding toward the notion of immersion, according to the semantic meanings of the terms ＂virtual＂ and ＂reality＂. The paper ana... This paper presents a survey on virtual reality systems and provides an in-depth understanding toward the notion of immersion, according to the semantic meanings of the terms ＂virtual＂ and ＂reality＂. The paper analyses the structure and functions of a virtual reality system and takes the three dimensional display as the immersive medium to identify the key issues for construction of virtual environments. The paper also reviews the development of virtual reality technology and introduces new image processing techniques into the design of virtual reality systems and virtual environments. 展开更多
关键词 Virtual reality immersion virtual reality image processing technology
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Empirical Study of Tree Parity Machine and Its Applicationon Key Management for Wireless Sensor Networks 认领 引用 被引量：1
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作者 陈铁明 蔡家楣 马世龙 《China Communications》 SCIE CSCD 2011年第2期118-125,共8页
In this paper,a model with two mutual learning neural networks named Tree Parity Machine(TPM) is firstly introduced,as well as its cryptographic property of weight synchronization with that of chaos cryptography is co... In this paper,a model with two mutual learning neural networks named Tree Parity Machine(TPM) is firstly introduced,as well as its cryptographic property of weight synchronization with that of chaos cryptography is comparatively discussed. A full empirical study on the stability and security of the TPM weight synchronization is conducted in detail. Then two improvement methods for the weight synchronization are proposed. Experiment results show that the improved TPM synchronization model can be efficiently against the third party attack. At last,a lightweight TPM-based key management scheme is proposed for TinySec on wireless sensor networks,which is full implemented on the Mica2 node and the performance test result is acceptable. 展开更多
关键词 tree parity machine synchronization key management wireless sensor networks
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ALSTNet:Autoencoder fused long-and short-term time-series network for the prediction of tunnel structure 认领 引用
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作者 Bowen Du Haohan Liang +3 位作者 Yuhang Wang Junchen Ye Xuyan Tan Weizhong Chen 《Deep Underground Science and Engineering》 EI CAS CSCD 2025年第1期72-82,共11页
It is crucial to predict future mechanical behaviors for the prevention of structural disasters.Especially for underground construction,the structural mechanical behaviors are affected by multiple internal and externa... It is crucial to predict future mechanical behaviors for the prevention of structural disasters.Especially for underground construction,the structural mechanical behaviors are affected by multiple internal and external factors due to the complex conditions.Given that the existing models fail to take into account all the factors and accurate prediction of the multiple time series simultaneously is difficult using these models,this study proposed an improved prediction model through the autoencoder fused long-and short-term time-series network driven by the mass number of monitoring data.Then,the proposed model was formalized on multiple time series of strain monitoring data.Also,the discussion analysis with a classical baseline and an ablation experiment was conducted to verify the effectiveness of the prediction model.As the results indicate,the proposed model shows obvious superiority in predicting the future mechanical behaviors of structures.As a case study,the presented model was applied to the Nanjing Dinghuaimen tunnel to predict the stain variation on a different time scale in the future. 展开更多
关键词 autoencoder deep learning structural health monitoring time-series prediction
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UAV navigation in high dynamic environments:A deep reinforcement learning approach 认领 引用 被引量：36
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作者 Tong GUO Nan JIANG +3 位作者 Biyue LI Xi ZHU Ya WANG Wenbo DU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第2期479-489,共11页
Unmanned Aerial Vehicle(UAV) navigation is aimed at guiding a UAV to the desired destinations along a collision-free and efficient path without human interventions, and it plays a crucial role in autonomous missions i... Unmanned Aerial Vehicle(UAV) navigation is aimed at guiding a UAV to the desired destinations along a collision-free and efficient path without human interventions, and it plays a crucial role in autonomous missions in harsh environments. The recently emerging Deep Reinforcement Learning(DRL) methods have shown promise for addressing the UAV navigation problem,but most of these methods cannot converge due to the massive amounts of interactive data when a UAV is navigating in high dynamic environments, where there are numerous obstacles moving fast.In this work, we propose an improved DRL-based method to tackle these fundamental limitations.To be specific, we develop a distributed DRL framework to decompose the UAV navigation task into two simpler sub-tasks, each of which is solved through the designed Long Short-Term Memory(LSTM) based DRL network by using only part of the interactive data. Furthermore, a clipped DRL loss function is proposed to closely stack the two sub-solutions into one integral for the UAV navigation problem. Extensive simulation results are provided to corroborate the superiority of the proposed method in terms of the convergence and effectiveness compared with those of the state-of-the-art DRL methods. 展开更多
关键词 Autonomous vehicles Deep learning Motion planning Navigation Reinforcement learning Unmanned Aerial Vehicle(UAV)
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Conception and Exploration of Using Data as a Service in Tunnel Construction with the NATM 认领 引用 被引量：8
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作者 Bowen Du Yanliang Du +1 位作者 Fei Xu Peng He 《Engineering》 SCIE EI CAS 2018年第1期123-130,共8页
The New Austrian Tunneling Method （NATM） has been widely used in the construction of mountain tun- nels, urban metro lines, underground storage tanks, underground power houses, mining roadways, and so on, The variat... The New Austrian Tunneling Method （NATM） has been widely used in the construction of mountain tun- nels, urban metro lines, underground storage tanks, underground power houses, mining roadways, and so on, The variation patterns of advance geological prediction data, stress-strain data of supporting struc- tures, and deformation data of the surrounding rock are vitally important in assessing the rationality and reliability of construction schemes, and provide essential information to ensure the safety and scheduling of tunnel construction, However, as the quantity of these data increases significantly, the uncertainty and discreteness of the mass data make it extremely difficult to produce a reasonable con- struction scheme; they also reduce the forecast accuracy of accidents and dangerous situations, creating huge challenges in tunnel construction safety, In order to solve this problem, a novel data service system is proposed that uses data-association technology and the NATM, with the support of a big data environ- ment, This system can integrate data resources from distributed monitoring sensors during the construc- tion process, and then identify associations and build relations among data resources under the same construction conditions, These data associations and relations are then stored in a data pool, With the development and supplementation of the data pool, similar relations can then he used under similar con- ditions, in order to provide data references for construction schematic designs and resource allocation, The proposed data service system also provides valuable guidance for the construction of similar projects. 展开更多
关键词 New Austrian Tunneling Method Big data environments Data as a service Tunnel construction
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Real-time prediction of mechanical behaviors of underwater shield tunnel structure using machine learning method based on structural health monitoring data 认领 引用 被引量：8
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作者 Xuyan Tan Weizhong Chen +2 位作者 Tao Zou Jianping Yang Bowen Du 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第4期886-895,共10页
Predicting the mechanical behaviors of structure and perceiving the anomalies in advance are essential to ensuring the safe operation of infrastructures in the long run.In addition to the incomplete consideration of i... Predicting the mechanical behaviors of structure and perceiving the anomalies in advance are essential to ensuring the safe operation of infrastructures in the long run.In addition to the incomplete consideration of influencing factors,the prediction time scale of existing studies is rough.Therefore,this study focuses on the development of a real-time prediction model by coupling the spatio-temporal correlation with external load through autoencoder network(ATENet)based on structural health monitoring(SHM)data.An autoencoder mechanism is performed to acquire the high-level representation of raw monitoring data at different spatial positions,and the recurrent neural network is applied to understanding the temporal correlation from the time series.Then,the obtained temporal-spatial information is coupled with dynamic loads through a fully connected layer to predict structural performance in next 12 h.As a case study,the proposed model is formulated on the SHM data collected from a representative underwater shield tunnel.The robustness study is carried out to verify the reliability and the prediction capability of the proposed model.Finally,the ATENet model is compared with some typical models,and the results indicate that it has the best performance.ATENet model is of great value to predict the realtime evolution trend of tunnel structure. 展开更多
关键词 Shied tunnel Machine learning Monitoring Real-time prediction Data analysis
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The effects of beam drifts on elastic scattering measured by the large solid-angle covered detector array 认领 引用 被引量：7
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作者 Yong-Jin Yao Cheng-Jian Lin +6 位作者 Lei Yang Nan-Ru Ma Dong-Xi Wang Gao-Long Zhang Guang-Xin Zhang Hui-Ming Jia Feng Yang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2021年第2期24-31,共8页
A new detector array characterized by compact structure and large solid-angle coverage was designed for radioactive ion beam(RIB)experiments and measuring multi-particle correlations.A Monte Carlo simulation was perfo... A new detector array characterized by compact structure and large solid-angle coverage was designed for radioactive ion beam(RIB)experiments and measuring multi-particle correlations.A Monte Carlo simulation was performed to explore the effects of beam drifts in different directions and distances on the angular distribution of the Rutherford scattering,as measured by the detector array.The results indicate that when the beam drift distance is less than 2.0 mm,the symmetry of the detector array can maintain a count error of less than 5%.This confirms the property of the detector array for RIB experiments.Furthermore,the simulation was validated through the elastic scattering angular distributions of 6;7 Li measured by the detector array in 6;7Li t209 Bi experiments at different energies. 展开更多
关键词 Large solid-angle detector array Beam drift Monte Carlo simulation Elastic scattering
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Infinite Sequence of Conservation Laws and Analytic Solutions for a Generalized Variable-Coefficient Fifth-Order Korteweg-de Vries Equation in Fluids 认领 引用 被引量：6
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作者 于鑫 高以天 +1 位作者 孙志远 刘颖 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第4期629-634,共6页
In this paper, an infinite sequence of conservation laws for a generalized variable-coefficient fifth-order Korteweg-de Vries equation in fluids are constructed based on the Backlund transformation. Hirota bilinear fo... In this paper, an infinite sequence of conservation laws for a generalized variable-coefficient fifth-order Korteweg-de Vries equation in fluids are constructed based on the Backlund transformation. Hirota bilinear form and symbolic computation are applied to obtain three kinds of solutions. Variable coefficients can affect the conserved density, associated flux, and appearance of the characteristic lines. Effects of the wave number on the soliton structures are also discussed and types of soliton structures, e.g., the double-periodic soliton, parallel soliton and soliton complexes, are presented. 展开更多
关键词 variable-coefficient fifth-order Korteweg-de Vries equation in fluids infinite sequence of conservation laws Hirota bilinear method soliton solutions wave number symbolic computation
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Existence of Formal Conservation Laws of a Variable-Coefficient Korteweg-de Vries Equation from Fluid Dynamics and Plasma Physics via Symbolic Computation 认领 引用 被引量：3
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作者 张春义 李娟 +2 位作者 孟祥花 许韬 高以天 《Chinese Physics Letters》 SCIE EI CAS 2008年第3期878-880,共3页
Employing the method which can be used to demonstrate the infinite conservation laws for the standard Kortewegde Vries （KdV） equation, we prove that the variable-coeFficient KdV equation under the Painlevé test... Employing the method which can be used to demonstrate the infinite conservation laws for the standard Kortewegde Vries （KdV） equation, we prove that the variable-coeFficient KdV equation under the Painlevé test condition also possesses the formal conservation laws. 展开更多
关键词 NONLINEAR EVOLUTION-EQUATIONS SOLITARY WAVES MATHEMATICAL APPROACH POSITONIC SOLUTIONS KDV EQUATION DUSTY PLASMA MODEL TRANSFORMATION SOLITONS DEVRIES
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A New Kind of Subjective Trust Model 认领 引用 被引量：3
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作者 ZHANG Guangwei KANG Jianchu +3 位作者 LUO Ziqiang MENG Xiangyi FANG Peici LI Deyi 《Wuhan University Journal of Natural Sciences》 EI CAS 2006年第6期1457-1461,共5页
Based on the outstanding characteristics of Cloud Model on the process of transforming a qualitative concept to a set of quantitative numerical values, a formalized model of subjective trust is introduced by which we ... Based on the outstanding characteristics of Cloud Model on the process of transforming a qualitative concept to a set of quantitative numerical values, a formalized model of subjective trust is introduced by which we can transform between qualitative reputation and quantitative voting data. The present paper brings forward algorithms to compute direct trust and recommender trust. Further more, an effective similarity measuring method used to distinguish two users＇ reputation on knowledge level is also proposed. The given model properly settles the uncertainty and fuzziness properties of subjective trust which is always the weakness of traditional subjective trust model, and provides a step in the direction of proper understanding and definition of human trust. 展开更多
关键词 subjective trust reputation opens network cloud model uncertainty fuzziness
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The study on the mechanical characteristics of articular cartilage in simulated microgravity 认领 引用 被引量：3
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作者 Hai-Jun Niu Qing Wang +6 位作者 Yue-Xiang Wang Ang Li Lian-Wen Sun Yan Yan Fan Fan De-Yu Li Yu-Bo Fan 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第5期1488-1493,共6页
The microgravity environment of a long-term space flight may induce acute changes in an astronaut＇s musculo-skeletal systems. This study explores the effects of simulated microgravity on the mechanical characteristic... The microgravity environment of a long-term space flight may induce acute changes in an astronaut＇s musculo-skeletal systems. This study explores the effects of simulated microgravity on the mechanical characteristics of articular cartilage. Six rats underwent tail suspension for 14 days and six additional rats were kept under normal earth gravity as controls. Swelling strains were measured using high-frequency ultrasound in all cartilage samples subject to osmotic loading. Site-specific swelling strain data were used in a triphasic theoretical model of cartilage swelling to determine the uniaxial modulus of the cartilage solid matrix. No severe surface irregularities were found in the cartilage samples obtained from the control or tail-suspended groups. For the tail-suspended group, the thickness of the cartilage at a specified site, as determined by ultrasound echo, showed a minor decrease. The uniaxial modulus of articular cartilage at the specified site decreased significantly, from （6.31 ± 3.37） MPa to （5.05 ± 2.98）MPa （p 〈 0.05）. The histology- stained image of a cartilage sample also showed a reduced number of chondrocytes and decreased degree of matrix staining. These results demonstrated that the 14 d simulated microgravity induced significant effects on the mechanical characteristics of articular cartilage. This study is the first attempt to explore the effects of simulated microgravity on the mechanical characteristics of articular cartilage using an osmotic loading method and a triphasic model. The conclusions may provide reference information for manned space flights and a better understanding of the effects of microgravity on the skeletal system. 展开更多
关键词 Simulated microgravity Articular cartilage.Triphasic theory High-frequency ultrasound Uniaxialmodulus
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Design and Implementation of Spacecraft Automatic Test Language 认领 引用 被引量：4
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作者 YU Dan MA Shilong 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2011年第3期287-298,共12页
Spacecraft automatic test system,a comprehensive spacecraft test information system based on the various spacecraft test specifications formalized as spacecraft test language,is an important means to improve test effi... Spacecraft automatic test system,a comprehensive spacecraft test information system based on the various spacecraft test specifications formalized as spacecraft test language,is an important means to improve test efficiency.With the new require-ments of the multi-spacecraft test in China,the study of the spacecraft test language becomes a new challenge for spacecraft test field.In this article,a high-order spacecraft test language,China aerospace test and operation language(CATOL),is given asso-ciated with the current test requirements;meanwhile,the structure of the language is presented.Then,for characterizing and formalizing the spacecraft processes,the syntax and operational semantics of one of the sub-languages,CATOL-PR,are defined.Finally,the prototype system of this proposed language is presented.This language will improve the specification of spacecraft test work in China and the efficiency of spacecraft testers,and promote the development in spacecraft automatic test. 展开更多
关键词 spacecraft test language high-order language spacecraft automatic test operational semantics
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Painleve Analysis and Determinant Solutions of a (3+1)-Dimensional Variable-Coefficient Kadomtsev-Petviashvili Equation in Wronskian and Grammian Form 认领 引用 被引量：2
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作者 MENG Xiang-Hua TIAN Bo +2 位作者 FENG Qian YAO Zhen-Zhi GAO Yi-Tian 《Communications in Theoretical Physics》 SCIE CAS 2009年第6期1062-1068,共7页
In this paper, the investigation is focused on a （3＋1）-dimensional variable-coefficient Kadomtsev- Petviashvili （vcKP） equation, which can describe the realistic nonlinear phenomena in the fluid dynamics and plas... In this paper, the investigation is focused on a （3＋1）-dimensional variable-coefficient Kadomtsev- Petviashvili （vcKP） equation, which can describe the realistic nonlinear phenomena in the fluid dynamics and plasma in three spatial dimensions. In order to study the integrability property of such an equation, the Painlevé analysis is performed on it. And then, based on the truncated Painlevé expansion, the bilinear form of the （3＋1）-dimensionaJ vcKP equation is obtained under certain coefficients constraint, and its solution in the Wronskian determinant form is constructed and verified by virtue of the Wronskian technique. Besides the Wronskian determinant solution, it is shown that the （3＋1）-dimensional vcKP equation also possesses a solution in the form of the Grammian determinant. 展开更多
关键词 （3＋1）-dimensional variable-coefficient Kadomtsev-Petviashvili equation Painlev@ analysis bilinear form Wronskian determinant Grammian determinant symbolic computation
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The Unconventional Transport Properties of Dirac Fermions in Graphyne 认领 引用 被引量：2
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作者 LIN Xin WANG Hai-Long +1 位作者 PAN Hui XU Huai-Zhe 《Chinese Physics Letters》 SCIE EI CAS CSCD 2013年第7期189-192,共4页
A two-band Hamiltonian for β-graphyne is derived by the k·p method.The energy dispersions around the Dirac points are analytically obtained depending on the relative amplitude of the hopping terms t12,and ... A two-band Hamiltonian for β-graphyne is derived by the k·p method.The energy dispersions around the Dirac points are analytically obtained depending on the relative amplitude of the hopping terms t12,and the Dirac cones are elliptical when -2t12j.This interesting feature is useful for direction-dependent wave filter devices. 展开更多
关键词 method. Dirac Fermi
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Tensor Coupling Effects on Spin Symmetry in the Anti-Lambda Spectrum of Hypernuclei 认领 引用 被引量：2
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作者 SONG Chun-Yan YAO Jiang-Ming MENG Jie 《Chinese Physics Letters》 SCIE EI CAS CSCD 2011年第9期80-83,共4页
Effects ofΛΛω−tensor coupling on the spin symmetry ofΛspectra inΛ−nucleus systems are studied using relativistic mean-field theory.Taking 12C+Λas an example,it is found that the tensor coupling enlarges the spin... Effects ofΛΛω−tensor coupling on the spin symmetry ofΛspectra inΛ−nucleus systems are studied using relativistic mean-field theory.Taking 12C+Λas an example,it is found that the tensor coupling enlarges the spin−orbit splittings ofΛby a factor of 5 but has a negligible effect on the wave functions ofΛ.Similar conclusions are observed in otherΛ−nuclei,including 16O+Λ,40Ca+Λand 208Pb+Λ.It is indicated that the spin symmetry in anti-lambda-nucleus systems is still a good approximation irrespective of the tensor coupling. 展开更多
关键词 theory tensor symmetry
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Simulation of(p,d) reaction on RIBLL2 for study of tensor force 认领 引用
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作者 郭晨雷 张高龙 +3 位作者 屈卫卫 Satoru Terashima Isao Tanihata 乐小云 《Nuclear Science and Techniques》 SCIE CAS CSCD 2015年第4期72-76,共5页
In order to study the effect of tensor force,we plan to perform a(p,d)reaction with a 400–1600 Me V proton beam on the RIBLL2 at Lanzhou.Based on the experimental conditions of RIBLL2,a Monte Carlo method is used to ... In order to study the effect of tensor force,we plan to perform a(p,d)reaction with a 400–1600 Me V proton beam on the RIBLL2 at Lanzhou.Based on the experimental conditions of RIBLL2,a Monte Carlo method is used to simulate(p,d)reaction process.The distributions of primary beam and scattered deuterons are given on the target and at the F1,F2,F3,and F4 positions.Considering the yield of the deuteron,to separate the produced deuteron from the background particles,the target thickness is optimized.To obtain a clear particle identification spectrum by time of flight(TOF)and energy loss(?E),the distance between the two detectors,as well as the energy and timing resolution of detectors are simulated.As a result,the distance between F2 and F4 is fit for that of TOF.After taking into account the particle distribution at F4,both sizes of Multi-Wire Drift Chamber,namely MWDC2 and MWDC3,are selected to be 50 mm×50 mm. 展开更多
关键词 反应过程 模拟 张力 Carlo法 能量分辨率 实验条件 能量损失 粒子识别
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Quantitative Parameters Analysis for Prenatally Echocardiographic Diagnosis of Atrioventricular Septal Defects 认领 引用
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作者 Xiaoxue Zhou Tingyang Yang +8 位作者 Ye Zhang Yanping Ruan Jiancheng Han Xiaowei Liu Ying Zhao Xiaoyan Gu Tingting Liu Hairui Wang Yihua He 《Congenital Heart Disease》 SCIE 2023年第3期387-397,共11页
Background:Atrioventricular septal defects(AVSDs)are screened and diagnosed usually rely on the imaging characteristics of fetal echocardiography(FE).However,diagnosis on images is heavily depended on sonographers’ex... Background:Atrioventricular septal defects(AVSDs)are screened and diagnosed usually rely on the imaging characteristics of fetal echocardiography(FE).However,diagnosis on images is heavily depended on sonographers’experience and the quantitative data are rarely studied.Objective:This study aimed to realize the prenatal diagnosis of AVSDs by analyzing the quantitative data on FE.Methods:One hundred and thirteen cardiac quantitative data was analyzed in 370 normal and 49 AVSDs fetuses retrospectively.The top six with the highest diagnostic accuracy rate were acquired according to the area under the curve(AUC),and the diagnostic value of six variables was analyzed.Results:Six parameters obtained on the four-chamber view(4CHV),including the atrial to ventricular length ratio in end-diastole(AVLR-ED),AVLR-ED combined with the atrial to ventricular length ratio in end-systole(AVLR-ES),quantile score(Q score)of AVLR-ED,Q score of AVLR-ES,Q score of ventricle length in end-diastole(VL-ED),and AVLR-ES,were the top six with the highest diagnostic value,and the AUC was 0.99(95%CI 0.99–1.00),0.99(95%CI 0.99–1.00),0.99(95%CI 0.98–1.00),0.95(95%CI 0.91–0.99),0.93(95%CI 0.87–0.99),and 0.91(95%CI 0.83–1.00),respectively.And within the 20%false positive rate,the diagnostic sensitivity was greater than 100%,100%,100%,90%,90%,and 88%,respectively.Conclusions:Six variables could be used for prenatal diagnosis of AVSDs.Among them,AVLR-ED and Q score of AVLR-ED,obtained on the 4CHV,were more convenient to acquire and had higher diagnostic accuracy. 展开更多
关键词 AVSDs fetus echocardiography Q score quantitative
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