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| 1 | Coupled dynamic model of state estimation for hypersonic glide vehicle显示文摘Aiming at handling complicated maneuvers or other unpredicted emergencies for hypersonic glide vehicle tracking,three coupled dynamic models of state estimation based on the priori information between guidance variables and aerodynamics are presented. Firstly, the aerodynamic acceleration acting on the target is analyzed to reveal the essence of the target's motion.Then three coupled structures for modeling aerodynamic parameters are developed by different ideas: the spiral model with a harmonic oscillator, the bank model with trigonometric functions of the bank angle and the guide model with the changing rule of guidance variables. Meanwhile, the comparison discussion is concluded to show the novelty and advantage of these models.Finally, a performance assessment in different simulation cases is presented and detailed analysis is revealed. The results show that the proposed models perform excellent properties. Moreover, the guide model produces the best tracking performance and the bank model shows the second; however, the spiral model does not outperform the maneuvering reentry vehicle(MaRV) model markedly. | ZHANG Kai XIONG Jiajun FU Tingting | 2018 | Journal of Systems Engineering and Electronics2018，29，6： | 12 |
| 2 | NSHV trajectory prediction algorithm based on aerodynamic acceleration EMD decomposition显示文摘Aiming at the problem of gliding near space hypersonic vehicle(NSHV)trajectory prediction,a trajectory prediction method based on aerodynamic acceleration empirical mode decomposition(EMD)is proposed.The method analyzes the motion characteristics of the skipping gliding NSHV and verifies that the aerodynamic acceleration of the target has a relatively stable rule.On this basis,EMD is used to extract the trend of aerodynamic acceleration into multiple sub-items,and aggregate sub-items with similar attributes.Then,a prior basis function is set according to the aerodynamic acceleration stability rule,and the aggregated data are fitted by the basis function to predict its future state.After that,the prediction data of the aerodynamic acceleration are used to drive the system to predict the target trajectory.Finally,experiments verify the effectiveness of the method.In addition,the distribution of prediction errors in space is discussed,and the reasons are analyzed. | LI Fan XIONG Jiajun LAN Xuhui BI Hongkui CHEN Xin | 2021 | Journal of Systems Engineering and Electronics2021，32，1： | 6 |
| 3 | A manual inspection of Defects4J bugs and its implications for automatic program repair显示文摘Automatic program repair techniques, which target to generate correct patches for real-world defects automatically, have gained a lot of attention in the last decade. Many different techniques and tools have been proposed and developed. However, even the most sophisticated automatic program repair techniques can only repair a small portion of defects while producing a large number of incorrect patches.A possible reason for the low performance is the test suites of real-world programs are usually too weak to guarantee the behavior of a program. To understand to what extent defects can be fixed with exiting test suites, we manually analyzed 50 real-world defects from Defects4J, where a large portion(i.e., 82%) of them were correctly fixed. This result suggests that there is much room for the current automatic program repair techniques to improve. Furthermore, we summarized seven fault localization and seven patch generation strategies that are useful in localizing and fixing these defects, and compared those strategies with current techniques. The results indicate potential directions to improve automatic program repair in the future. | Jiajun JIANG Yingfei XIONG Xin XIA | 2019 | Science China(Information Sciences)2019，62，10： | 2 |
| 4 | Hypersonic Vehicle Trajectory Prediction Algorithm Based on Hough Transform显示文摘Trajectory prediction is a prerequisite for missile and high-speed vehicle guidance interception.To address the trajectory problem for the near space hypersonic unpowered gliding vehicle.Firstly,the trajectory prediction mechanism is analyzed.Based on the existing NSHV trajectory prediction method,the key techniques of trajectory prediction are discussed from the perspectives of prediction parameter selection and prediction parameter description.Then,a trajectory prediction method based on Hough transform is proposed.The core of the method is to select the longitude latitude,and high direction positions as prediction parameters,and use the Hough transform to fit the prior basis functions.In the latitude and longitude direction,the rationality of predicting parameters is discussed from two aspects:position extreme point and lateral maneuverability.In the height direction,for the NSHV oscillation drop characteristic,two Hough transforms are used to separate the periodic term from the linear term.In addition,we give the approximate interval of the parameter values of the method,and design a parameter adaptive scheme.Finally,trajectory prediction is performed on two different control patterns.The error of the prediction time of 100 s is within 25 km,and the results show the effectiveness of the proposed method. | LI Fan XIONG Jiajun LAN Xuhui BI Hongkui TAN Xiansi | 2021 | Chinese Journal of Electronics2021，30，5： | 2 |
| 5 | Effects of precursor solution concentration on the properties and morphology of YBCO films deposited by TFA-MOD method显示文摘Epitaxial YBCO films were deposited on (100) LaAlO3 single-crystal substrates by metalorganic deposition ofmetal trifluoroacetate precursors with different concentrations. All the YBCO films have Tc around 91 K and Jc excess 2MA/cm2 at 77 K in zero field. XRD θ-2θscans show all the films have c-axis normal orientation. The FWHM (full width athalf-maximum intensity) values of X-ray ω-scans of (005) reflection are 0.379°, 0.283°, and 0.543° for the YBCO thin filmsdeposited with precursor solution concentrations of 1.52, 1.0, and 0.75 mol/L, respectively. With the concentration of theprecursors decreasing, the thickness of the films decreases linearly. SEM micrographs show that porosities in the films be-come bigger with the precursor solution concentration decreasing. The big porosities in the film with the lowest concentra-tion precursor deteriorate the superconducting property and make it have a wider superconducting transition and a lower Jc. | CUI Xumei TAO Bowan LI Yanrong LIU Xingzhao CHEN Jiajun XIONG Jie | 2005 | Rare Metals2005，24，3： | 2 |
| 6 | Adsorption behavior of Cd(II) from aqueous solutions onto gel-type weak acid resin显示文摘 | Xiong Chunhua Yao Caiping Wang Li Ke Jiajun | 2009 | Hydrometallurgy2009，98，34： | 1 |
| 7 | A dual channel perturbation particle filter algorithm based on GPU acceleration显示文摘The particle filter(PF) algorithm is one of the most commonly used algorithms for maneuvering target tracking. The traditional PF maps from multi-dimensional information to onedimensional information during particle weight calculation, and the incorrect transmission of information leads to the fact that the particle prediction information does not match the weight information, and its essence is the reduction of the information entropy of the useful information. To solve this problem, a dual channel independent filtering method is proposed based on the idea of equalization mapping. Firstly, the particle prediction performance is described by particle manipulations of different dimensions, and the accuracy of particle prediction is improved. The improvement of particle degradation of this algorithm is analyzed in the aspects of particle weight and effective particle number. Secondly, according to the problem of lack of particle samples, the new particles are generated based on the filtering results, and the particle diversity is increased. Finally, the introduction of the graphics processing unit(GPU) parallel computing the platform, the 'channel-level' and 'particlelevel' parallel computing the program are designed to accelerate the algorithm. The simulation results show that the algorithm has the advantages of better filtering precision, higher particle efficiency and faster calculation speed compared with the traditional algorithm of the CPU platform. | LI Fan BI Hongkui XIONG Jiajun YU Chenlong LAN Xuhui | 2018 | Journal of Systems Engineering and Electronics2018，29，4： | 1 |
| 8 | A Heuristic Clustering Algorithm forIntrusion Detection Based on Information Entropy显示文摘This paper studied on the clustering problem for intrusion detection with the theory of information entropy, it was put forward that the clustering problem for exact intrusion detection based on information entropy is NP-complete, therefore, the heuristic algorithm to solve the clustering problem for intrusion detection was designed, this algorithm has the characteristic of incremental development, it can deal with the database with large connection records from the internet. | XIONG Jiajun LI Qinghua TU Jing | 2006 | Wuhan University Journal of Natural Sciences2006，11，2： | 1 |
| 9 | A Kind of multilayer intrusion detection system using mobile agent显示文摘 | Xiong Jiajun Zhang Jing | 2003 | IEEE Proceedings of the Second International Conference on Machine Learning and Cybernetics2003，，11： | 1 |
| 10 | Integrating absolute distances in collaborative representation for robust image classification显示文摘 | Shaoning Zeng Xiong Yang Jianping Gou Jiajun Wen | 2016 | CAAI Transactions on Intelligence Technology2016，1，2： | 0 |
| 11 | Enhanced Electronic Raman Spectra of Different Morphologic Neodymium Hydroxides显示文摘Nd(OH)3 particles sized of nanometer have been prepared using the different methods. The obtained neodymium hydroxide samples were investigated using the enhanced electronic Raman spectroscopy, X-ray diffraction, transmission electron microscopy, as well as field emission electron microscopy. Observable changes in electronic Raman bands were found among the electronic Raman spectra of Nd(OH)3 particles which formed under different physical-chemical conditions. Compared to the difference of the X-ray diffraction paterns, it suggests that the change of size and morphology of Nd(OH)3 particles occurs with subtle variation on the coordination environment around the neodymium ions, while the X-ray diffraction indicates the different long-ranged ordered structure of the Nd(OH)3 particles. Furthermore, the selected area electron diffraction (SAED), which manifests several crystal cells orientation, shows that the obtained Nd(OH)3 particles are of the same hexagonal symmetry of Nd(OH)3. Therefore, the X-ray diffraction, selected area electron diffraction (SAED) and enhanced electronic Raman spectroscopy reflect different levels of structure of neodymium hydroxide in morphological, crystalline, and coordination environment. At certain extent, the subtle variation of coordination structure may account for the special physical-chemical properties of nanometer materials. The enhanced electronic Raman spectroscopy could be a new probe to study the subtle variation of the physical-chemical properties of nanometer materials. | Wang Jiajun Zhu Qingwei Xu Yizhuang Huang Yaping Zhou Yong Xiong Boqing Lin Chenguang Zhou Fengshan Wang Dujin | 2006 | Journal of Rare Earths2006，24，3： | 0 |
| 12 | The origins of kinetics hysteresis and irreversibility of monoclinic Li_(3)V_(2)(PO_(4))_(3)显示文摘Monoclinic Li_(2)V_(2)(PO_(4))_(3);is a promising cathode material with complex charge–discharge behavior.Previous structural investigation of this compound mainly focuses on local environments;while the reaction kinetics and the driving force of irreversibility of this material remain unclear.To fully understand the above issues,both the equilibrium and the non-equilibrium reaction routes have been systematically investigated in this study.Multiple characterization techniques including X-ray diffraction,variable temperature(spinning rate)and ex/in situ ^(7)Li,^(31)P solid state NMR have been employed to provide comprehensive insights into kinetics,dynamics,framework structure evolution and charge ordering,which is essential to better design and application of lithium transition metal phosphate cathodes.Our results suggest that the kinetics process between the non-equilibrium and the quasi-equilibrium delithiation pathways from Li_(2)V_(2)(PO_(4))_(3);to V_(2)(PO_(4))_(3);is related with a slow relaxation from two-site to one-site delithiation.More importantly,it has been demonstrated that the irreversibility in this system is not solely affected by cation and/or charge ordering/disordering,but mainly driven by framework structure distortion. | Hua Huo Zeyu Lin Guiming Zhong Shuaifeng Lou Jiajun Wang Yulin Ma Changsong Dai Yueping Xiong Geping Yin Yong Yang | 2022 | Journal of Energy Chemistry2022，31，4： | 0 |
| 13 | Bilayer hydrogel dressing with lysozymeenhanced photothermal therapy for biofilm eradication and accelerated chronic wound repair显示文摘Biofilms are closely associated with the tough healing and dysfunctional inflammation of chronic wounds.Photothermal therapy(PTT)emerged as a suitable alternative which could destroy the structure of biofilms with local physical heat.However,the efficacy of PTT is limited because the excessive hyperthermia could damage surrounding tissues.Besides,the difficult reserve and delivery of photothermal agents makes PTT hard to eradicate biofilms as expectation.Herein,we present a GelMA-EGF/Gelatin-MPDA-LZM bilayer hydrogel dressing to perform lysozyme-enhanced PTT for biofilms eradication and a further acceleration to the repair of chronic wounds.Gelatin was used as inner layer hydrogel to reserve lysozyme(LZM)loaded mesoporous polydopamine(MPDA)(MPDA-LZM)nanoparticles,which could rapidly liquefy while temperature rising so as to achieve a bulk release of nanoparticles.MPDA-LZM nanoparticles serve as photothermal agents with antibacterial capability,could deeply penetrate and destroy biofilms.In addition,the outer layer hydrogel consisted of gelatin methacryloyl(GelMA)and epidermal growth factor(EGF)promoted wound healing and tissue regeneration.It displayed remarkable efficacy on alleviating infection and accelerating wound healing in vivo.Overall,the innovative therapeutic strategy we came up with has significant effect on biofilms eradication and shows promising application in promoting the repair of clinical chronic wounds. | Yizhen Wang Qijun Lv You Chen Langtao Xu Miao Feng Zhiyong Xiong Jiajun Li Jie Ren Jie Liu Bo Liu | 2023 | Acta Pharmaceutica Sinica B2023，13，1： | 0 |
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