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| 1 | Neural integrated control for a free-floating space robot with suddenly changing parameters显示文摘Because the state of a free-floating space robot model is uncertain and sudden changes in the model parameters might undermine the stability of the system,this paper proposes a control strategy based on a variable structure neural integrated controller.This scheme does not need a precise space robot model,making use of the radial basis function neural network ability approach to learn about an uncertain model.The network weights are adjusted online in real-time.During the early period of the control phase and parameter changes,the variable structure controller compensates for the uncertain model which the neural network could not learn well.It also creates global asymptotic stability for the whole closed-loop system.Simulation results show that the controller can handle bad changeable conditions and has important application value for defense,aerospace and other major security fields. | ZHANG WenHui QI NaiMing MA Jing XIAO AYang | 2011 | Science China(Information Sciences)2011，54，10： | 8 |
| 2 | An optimal one-way cooperative strategy for two defenders against an attacking missile显示文摘This paper investigates a cooperative strategy for protecting an aerial target.The problem is solved as a game among four players(a target,two defenders,and a missile).In this scenario,the target launches two defenders(defender-1 and defender-2)simultaneously,to establish a oneway cooperation system(OCS)against an attacking missile.A new optimal evasion strategy for the target is also derived.During the engagement,the target takes into account the reaction of the attacking missile,and guides defender-1 to the interception point by receiving information from defender-1.Depending on the control effort of the target,defender-2 can choose appropriate launch conditions and use very limited maneuvering capability to intercept the missile.For adversaries with first-order dynamics,simulation results show that the OCS allows two defenders to intercept the missile.During the engagement,even if one defender or communication channel is broken,the OCS still allows an interception to be made,thus increasing the target’s survivability. | Qilong SUN Naiming QI Zheyao XU Yanfang LIU Yong ZHANG | 2017 | Chinese Journal of Aeronautics2017，30，4： | 6 |
| 3 | Defect Recognition in Thermosonic Imaging显示文摘This work is aimed at developing an effective method for defect recognition in thermosonic imaging.The heat mechanism of thermosonic imaging is introduced,and the problem for defect recognition is discussed.For this purpose,defect existing in the inner wall of a metal pipeline specimen and defects embedded in a carbon fiber reinforced plastic(CFRP) laminate are tested.The experimental data are processed by pulse phase thermography(PPT) method to show the phase images at different frequencies,and the characteristic of phase angle vs frequency curve of thermal anomalies and sound area is analyzed.A binary image,which is based on the characteristic value of defects,is obtained by a new recognition algorithm to show the defects.Results demonstrate good defect recognition performance for thermosonic imaging,and the reliability of this technique can be improved by the method. | CHEN Dapeng WU Naiming ZHANG Zheng | 2012 | Chinese Journal of Aeronautics2012，25，4： | 4 |
| 4 | Guidance laws for attacking defended target显示文摘In this paper,two new guidance laws based on differential game theory are proposed and investigated for the attacker in an attacker-defender-target scenario.The conditions for the attacker winning the game are analyzed when the target and defender using the differential game guidance law based on the linear model.The core ideas underlying the two guidance laws are the attacker evading to a critical safe boundary from the defender,and then maintaining a critical miss distance.The guidance law more appropriate for the attacker to win the game differs according to the initial parameters.Unlike other guidance laws,when using the derived guidance laws there is no need to know the target and the defender’s control efforts.The results of numerical simulations show that the attacker can evade the defender and hit the target successfully by using the proposed derived guidance laws. | Qilong SUN Chenfeng ZHANG Ning LIU Weixue ZHOU Naiming QI | 2019 | Chinese Journal of Aeronautics2019，32，10： | 4 |
| 5 | Comparison of surface fractal dimensions of chromizing coating and P110 steel for corrosion resistance estimation显示文摘 | Naiming Lin Junwen Guo Faqin Xie Jiaojuan Zou Wei Tian Xiaofei Yao Hongyan Zhang Bin Tang | 2014 | Applied Surface Science2014，，： | 1 |
| 6 | Ground- based space microgravity simulation test method overview 显示文摘 | QI Naiming ZHANG Wenhui GAO Jiuzhou | 2011 | Aerospace Control2011，29，3： | 1 |
| 7 | Bactericidal behavior of Cu-containing stainless steel surfaces显示文摘 | Xiangyu Zhang Xiaobo Huang Yong Ma Naiming Lin Ailan Fan Bin Tang | 2012 | Applied Surface Science2012，，24： | 1 |
| 8 | Understanding the Soil Temperature Variability at Different Depths:Effects of Surface Air Temperature,Snow Cover,and the Soil Memory显示文摘The soil temperature(ST)is closely related to the surface air temperature(AT),but their coupling may be affected by other factors.In this study,significant effects of the AT on the underlying ST were found,and the time taken to propagate downward to 320 cm can be up to 10 months.Besides the AT,the ST is also affected by memory effects-namely,its prior thermal conditions.At deeper depth(i.e.,320 cm),the effects of the AT from a particular season may be exceeded by the soil memory effects from the last season.At shallower layers(i.e.,<80 cm),the effects of the AT may be blocked by the snow cover,resulting in a poorly synchronous correlation between the AT and the ST.In northeastern China,this snow cover blockage mainly occurs in winter and then vanishes in the subsequent spring.Due to the thermal insulation effect of the snow cover,the winter ST at layers above 80 cm in northeastern China were found to continue to increase even during the recent global warming hiatus period.These findings may be instructive for better understanding ST variations,as well as land−atmosphere interactions. | Haoxin ZHANG Naiming YUAN Zhuguo MA Yu HUANG | 2021 | Advances in Atmospheric Sciences2021，38，3： | 0 |
| 9 | Sediment environmental capacity of 137Cs in Daya Bay显示文摘Sediment environmental capacity of pollutants is very important for marine environmental management.Based on the methodology of a study on water,soil environmental capacity,and mass conservation theory in a system,the concept and model on sediment environmental capacity for 137Cs in Daya Bay were developed.The static capacity for 137Cs in the upper sediment near the shore at a shallow area was calculated,and the annual dynamic capacity and total dynamic capacity were also calculated through determination of the typical biomass in the sediment.The results showed that the estimated environmental capacity for 137Cs in sedi-ments was approximately equal to the current input of 137Cs into the sediments.Controlling the input of 137Cs in the sedi-ments within the environmental capacity guarantees the sus-tainability of the current situation of the Daya Bay ecosystem and avoidance of a significant degradation of the system. | ZHANG Junli CHEN Jiajun XU Jialin LI Yuanxin HUANG Naiming | 2007 | Frontiers of Environmental Science & Engineering2007，1，2： | 0 |
| 10 | Drought Resistance of Eight Maize Varieties at Seedling Stage in Yunnan Province显示文摘Using eight maize varieties( Tiannuo 888,Yunnuo 6,Yunrui 999,Yunrui 6,Yunrui 47,Yunrui 88,Yunyou 105,Yuntianyun 2) as the research materials,this paper aimed to figure out the possible influence caused by repeated drought treatment. A pot experiment was conducted to investigate the changes in 13 phenotypic characters and physiological and biochemical indexes( plant height,fresh mass,root shoot ratio,POD activity,SOD activity) related to drought resistance,under two levels of water supply( repeated drought treatment and CK) at seedling stage of maize varieties,and evaluated drought resistance comprehensively by standard deviation coefficient allocation weighed method. The results showed that the survival rate,leaf area,plant height,shoot fresh mass,root fresh mass,shoot dry mass and root dry mass of seedling maize decreased at varying degrees after repeated drought stress. However,the MDA molality,root shoot ratio,Pro content and soluble protein content increased under repeated drought stress. There were significant difference in morphological,physiological and biochemical indexes among different maize varieties. The drought resistances of different maize varieties successively were Yunrui 47 > Yuntianyu 2 > Yunyou 105 > Yunnuo 6 >Tianuo 888 > Yunrui 6 > Yunrui 999 > Yunrui 88. These results provide references for maize drought-resistant breeding and maize production. | Du Caiyan Duan Zongyan Wang Jianxin Zhang Naiming Yang Zhixin Lei Baokun Hu Wanli Chen Shihua Pan Yanhua | 2015 | Plant Diseases and Pests2015，6，4： | 0 |
| 11 | A survey of visual analytics techniques for online education显示文摘Visual analytics techniques are widely utilized to facilitate the exploration of online educational data.To help researchers better understand the necessity and the efficiency of these techniques in online education,we systematically review related works of the past decade to provide a comprehensive view of the use of visualization in online education problems.We establish a taxonomy based on the analysis goal and classify the existing visual analytics techniques into four categories:learning behavior analysis,learning content analysis,analysis of interactions among students,and prediction and recommendation.The use of visual analytics techniques is summarized in each category to show their benefits in different analysis tasks.At last,we discuss the future research opportunities and challenges in the utilization of visual analytics techniques for online education. | Xiaoyan Kui Naiming Liu Qiang Liu Jingwei Liu Xiaoqian Zeng Chao Zhang | 2022 | Visual Informatics2022，6，4： | 0 |
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