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Real-time evaluation method of flight mission load based on sensitivity analysis of physiological factors

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Chinese Journal of Aeronautics 2022年第3期35卷 450-463页

作者： Jun CHEN Lei XUE Jia RONG xudong gao School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Department of Data Science and AI Monash UniversityClaytonVIC 3800Australia

As the complexity of flight missions continues to increase,sending a timely warning or providing assistance to pilots helps to reduce the probability of operational errors and flight *** pilots’physiological data,real-time evaluation of mission load is a feasible technical way to achieve *** this paper,a set of flight tasks including aircraft control,humancomputer interaction and mental arithmetic tests are designed to simulate five mission loads at different flight difficulty levels.A sensitivity analysis method based on a comprehensive test is proposed to select a set of sensitive physiological ***,based on the SVM hierarchical combination classification method,the pilot mission load real-time evaluation model is *** test results show significant differences in EMG,respiration rate(abdomen),heart rate,blood oxygen saturation,pupil area,fixation duration,number of fixations,and *** high accuracy obtained from experiments proved that the proposed real-time evaluation model is applicable to meet the requirements of real working *** findings can provide methodological references for mission load evaluation research in other fields.

关键词： Eye movement Mission load Physiological data Sensitivity analysis Support Vector Machine(SVM)

DG polynomial algebras and their homological properties

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Science China Mathematics 2019年第4期62卷 629-648页

作者： Xuefeng Mao xudong gao Yanni Yang Jiahong Chen Department of Mathematics Shanghai University Department of Mathematics College of Mathematics and StatisticsKashgar University

In this paper, we introduce and study differential graded(DG for short) polynomial algebras. In brief, a DG polynomial algebra A is a connected cochain DG algebra such that its underlying graded algebra A~# is a polynomial algebra K[x_1, x_2,..., x_n] with |xi| = 1 for any i ∈ {1, 2,..., n}. We describe all possible differential structures on DG polynomial algebras, compute their DG automorphism groups, study their isomorphism problems, and show that they are all homologically smooth and Gorenstein DG algebras. Furthermore, it is proved that the DG polynomial algebra A is a Calabi-Yau DG algebra when its differential ?_A≠ 0 and the trivial DG polynomial algebra(A, 0) is Calabi-Yau if and only if n is an odd integer.

关键词： DG polynomial algebra cohomology graded algebra homologically smooth Gorenstein CalabiYau

A broadband integrated microwave photonic mixer based on balanced photodetection

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Frontiers of Optoelectronics 2023年第2期16卷 63-70页

作者： Zhenzhu Xu Li Mei Yuhua Chong xudong gao Shoubao Han Chengkun Yang Lin Li Anhui Province Engineering Laboratory for Antennas and Microwave East China Research Institute of Electronic EngineeringHefei 230000China Representative Ofce of the Army Armament Department in Hefei District Hefei 230000China

An integrated microwave photonic mixer based on silicon photonic platforms is proposed,which consist of a dual-drive Mach–Zehnder modulator and a balanced *** modulated optical signals from microwave photonic links can be directly demodulated and down-converted to intermediate frequency(IF)signals by the photonic *** converted signal is obtained by conducting of-chip subtraction of the outputs from the balanced photodetector,and subsequent fltering of the high frequency items by an electrical low-pass *** from balanced detection,the conversion gain of the IF signal is improved by 6 dB,and radio frequency leakage and common-mode noise are suppressed ***-level simulations show that the frequency mixing system has a spurious-free dynamic range of 89 dB·Hz^(2/3),even with deteriorated linearity caused by the two cascaded *** spur suppression ratio of the photonic mixer remains higher than 40 dB when the IF varies from 0.5 to 4 *** electrical-electrical 3 dB bandwidth of frequency conversion is 11 *** integrated frequency mixing approach is quite simple,requiring no extra optical flters or electrical 90°hybrid coupler,which makes the system more stable and with broader bandwidth so that it can meet the potential demand in practical applications.

关键词： Microwave photonics Integrated photonics Frequency conversion Photonic mixer Balanced detection

Underwater pulsed spark discharge influenced by the relative position between the top of a pin electrode and an insulating tube

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Plasma Science and Technology 2020年第5期22卷 35-43页

作者： xudong gao Jixuan WANG Yanfeng gao Hongyan YAN Kaiqiang XUE Xingnan DENG Xin YANG School of Water Conservancy and Hydroelectric power Hebei University of EngineeringHandan 056038People's Republic of China

Needle-to-plane geometry has been widely investigated and used in underwater pulsed *** position relationship between the needle tip and insulation layer significantly affects the discharge *** carried out experiments on underwater pulsed discharge with the needle tip protruding from,recessing into,and flushing with the insulating *** results are as ***,underwater pulsed discharge has a strong randomness under the experimental *** discharge patterns appeared under the same experimental ***,recession into the insulator surface led to a higher probability of occurrence but a lower strength of spark discharge than ***,between the needle tip protruding from and recessing into the insulation material,the average speed of propagation of underwater pulsed spark discharge decreased by an order of *** study shows that the optimum length of needle tip protruding from the insulation layer is 1 mm to obtain a strong underwater pulsed spark discharge.

关键词： discharge strength development speed of discharge channel plasma properties randomicity of spark discharge underwater pulsed spark discharge

Parameter optimization of control system design for uncertain wireless power transfer systems using modified genetic algorithm

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CAAI Transactions on Intelligence Technology 2022年第4期7卷 582-593页

作者： xudong gao Wenjie Cao Qiang Yang Honglin Wang Xiaolei Wang Guang Jin Jun Zhang School of Artificial Intelligence/School of Future Technology Nanjing University of Information Science and TechnologyNanjingChina School of Electronic and Information Zhongyuan University of TechnologyZhengzhouChina Graduate School of Engineering Tokyo University of Agriculture and TechnologyKoganeiTokyoJapan

The closed-loop wireless power transfer(WPT)system can realize constant voltage output in the presence of ***,the parameter design of the controller is a difficult *** traditional trial-and-error method is time-consuming and difficult to find optimal parameters.A parameter optimization strategy of control systems for uncertain WPT systems using the modified genetic algorithm(MGA)is ***,because the system has different characteristics at different periods,the simulation process is divided into three *** first one is the start-up stage,in which we mainly consider the overshoot and the rate of the voltage *** second one is the tracking stage,in which the tracking time and switching loss are mainly *** third one is the stabilisation stage,in which the steady-state error and switching loss are mainly ***,three cost functions are designed according to the characteristics of the three stages,and then the optimal controller parameters of each stage are obtained by using ***,the effectiveness of the proposed method is verified by *** optimization results show that compared with the previous parameter optimization method,the optimal controller parameters obtained by the proposed method make the WPT system achieve better performance.

关键词： power optimization system

Integrated contra‑directionally coupled chirped Bragg grating waveguide with a linear group delay spectrum

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Frontiers of Optoelectronics 2023年第1期16卷 85-93页

作者： xudong gao Zhenzhu Xu Yupeng Zhu Chengkun Yang Shoubao Han Zongming Duan Fan Zhang Jianji Dong Anhui Province Engineering Laboratory for Antennas and Microwave East China Research Institute of Electronic EngineeringHefei 230000China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Due to the advantages of low propagation loss,wide operation bandwidth,continuous delay tuning,fast tuning speed,and compact footprints,chirped Bragg grating waveguide has great application potential in wideband phased array beamforming ***,the disadvantage of large group delay error hinders their practical *** nonlinear group delay spectrum is one of the main factors causing large group delay *** solve this problem,waveguides with nonlinear gradient widths are adopted in this study to compensate for the nonlinear efect of the grating apodization on the mode efective *** a result,a linear group delay spectrum is obtained in the experiment,and the group delay error is halved.

关键词： Bragg gratings Silicon photonics True time delay

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Fostering Innovation

Beijing Review 2014年第4期57卷 36-37页

作者： gao xudong the Research Center for Technological Innovation at Tsinghua University

In the past 35 years, China has made tremendous achievements in innovation. Now the country＇s innovation-oriented development is heading for a ＂deep-water＇ phase, with both opportunities and challenges ahead. China... 详细信息

关键词：创新型培养中国

High variability of the gvpA-gvpC region in Microcystis

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Progress in Natural Science:Materials International 2007年第11期17卷 1290-1295页

作者： Xu Min, Xu xudong, gao Hong and Kong Renqiu(The State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China) State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Acad. of Sci. Wuhan 430072 China

Gas vesicles provide buoyancy to Microcystis and other common cyanobacterial bloom-forming species. gvpA and gvpC are structural genes encoding gas vesicle proteins. Phylogenetic analyses of 10 Microcystis strains/uncultured samples showed that gvpC and each intergenic segment of the gvpA-gvpC region can be divided into two types. The combination of different types of gvpC and intergenic segments is an important factor that diversifies this genomic region. Some Microcystis strains isolated in China possess a 172 to 176 bp sequence tag in the intergenic segment between gvpA and gvpC. The gvpA-gvpC region in Microcystis can be divided into at least 4 classes and more numbers of subclasses. Compared to rbcLX and other regions, the high variability of the gvpA-gvpC region should be more useful in identifying geographical isolates or ecotypes of Microcystis.

关键词： Microcystis gvpA-gvpC diversity

Structural changes in the conversion of an Arabidopsis outward-rectifying K^(+) channel into an inward-rectifying channel

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Plant Communications 2024年第6期5卷 5-8页

作者： xudong gao Xia Xu Tengfei Sun Yuhan Lu Yutian Jia Jiaqi Zhou Peng Fu Yanming Zhang Guanghui Yang State Key Laboratory of Plant Environmental Resilience Frontiers Science Center for Molecular Design BreedingDepartment of Nutrition and HealthCollege of Biological SciencesChina Agricultural UniversityBeijing 100193China

Dear Editor,By using cryo-electron microscopy and electrophysiology,this study characterizes the structural and functional dynamics of the K+outward-rectifying channel SKOR in Arabidopsis and the structural changes associated with a double mutation that transforms SKOR into an inward-rectifying K+channel,*** findings have implications for understanding and manipulating crop K+nutrition.

关键词： channel Arabidopsis changes