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RISS 인기검색어
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- 저자 : Qingquan Liu (검색결과 3 건)
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Improved Gauss Pseudospectral Method for UAV Trajectory Planning with Terminal Position Constraints
Qingquan Hu,Ping Liu,Jinfeng Yang 한국정보처리학회 2023 Journal of information processing systems Vol.19 No.5
Trajectory planning is a key technology for unmanned aerial vehicles (UAVs) to achieve complex flightmissions. In this paper, a terminal constraints conversion-based Gauss pseudospectral trajectory planningoptimization method is proposed. Firstly, the UAV trajectory planning mathematical model is established withconsidering the boundary conditions and dynamic constraints of UAV. Then, a terminal constraint handlingstrategy is presented to tackle terminal constraints by introducing new penalty parameters so as to improve theperformance index. Combined with Gauss-Legendre collocation discretization, the improved Gausspseudospectral method is given in detail. Finally, simulation tests are carried out on a four-quadrotor UAVmodel with different terminal constraints to verify the performance of the proposed method. Test studiesindicate that the proposed method performances well in handling complex terminal constraints and theimprovements are efficient to obtain better performance indexes when compared with the traditional Gausspseudospectral method.
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Jun Tang,Qingquan Liu,Haiyan Yuan,Yongxia Zhang,Weilin Wang,Suzhen Huang 한국유전학회 2018 Genes & Genomics Vol.40 No.8
Iris lactea var. chinensis is a perennial herbaceous halophyte with high salt tolerance and ornamental value. Previous RNA sequencing analysis revealed a transcription factor gene IlWRKY2 expression was upregulated by salt stress. To obtain the full-length sequence, the basic characteristics of IlWRKY2 and its expression pattern under salt stress. Full-length cDNA of IlWRKY2 was cloned by 3′/5′ RACE based on the intermediate sequence obtained by RNA sequencing analysis. Structure analysis of IlWRKY2 were performed by Compute pI/MW tool, PSIPRED and SWISS-MODEL analysis. Sequence analysis of IlWRKY2 were performed by BLAST program, DNAman software, MEGA software and MEME program. IlWRKY2 expression pattern was analyzed by quantitative real-time polymerase chain reaction. The open reading frame of IlWRKY2 is 1338 bp in length, which encodes a protein of 446 amino acids. Amino acid sequence analysis revealed that the IlWRKY2 contains one WRKY domains with a zinc finger motif C–X5–C–X23–H–X–H. Phylogenetic analysis showed that the IlWRKY2 was much closer to EgWRKY41 from Elaeis guineensis and MaWRKY42 from Musa acuminata subsp. malaccensis. Furthermore, the expression of IlWRKY2 in I. lactea var. chinensis shoots was upregulated by different concentrations of NaCl treatment and increased 16-fold after treatment with 200 mM NaCl for 12 h. Obtained the full-length cDNA of IlWRKY2 which belongs to Group II-b WRKY subfamily. IlWRKY2 expression was obviously induced by salt stress in I. lactea var. chinensis shoots and it may play an important role in halophyte I. lactea var. chinensis adaptation to environmental salt stress.
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He Dongxin,Zang Qingjing,Li Junda,Liu Hongshun,Xu Zhe,Li Qingquan 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
The thermal stress at the interface of different materials becomes distorted during the thermal expansion of a cable terminal, leading to cracking and insulation failure. To give a warning of the ultimate thermal stress of cable terminal, this paper presents a warning method for the ultimate thermal stress of the cable terminal based on tailpipe temperature monitoring. Taking a 110 kV gas-insulated switchgear cable terminal as an example, the heat transfer model of the cable terminal is established under the working condition of a through-flow. The relationship between the temperature of the tailpipe, maximum thermal stress of the epoxy casing, and current-carrying capacity of the cable is established based on a data fitting method, the ultimate stress of the epoxy is taken as a threshold value for the detection and calculate the corresponding current-carrying capacity of the cable and temperature of the tailpipe. The results show that the thermal stress concentration in the cable terminal exceeds the limit when the monitoring temperature at the exposed tailpipe reaches 54.25 °C. If the relationship between the external temperature of the cable terminal and maximum thermal stress is known, warning of the ultimate thermal stress of cable terminal by monitoring the temperature of the tailpipe, providing theoretical support for the regulation of the current-carrying capacity of the cable.
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