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RISS 인기검색어
- 검색키워드
- 저자 : Chunling Yang (검색결과 4 건)
- 무료
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- 유료
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The Frequency Estimation of Weak Signal Based on Chaotic System Fusion Technology
Yanchun Xu,Chunling Yang,Xiaodong Qu,Mengda Yang,Quan Yang 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
in this paper we use fusion technology based on Rossler chaotic oscillator and proportional differential control technology to detect the frequency of the weak signal. The dynamic character of Rossler equation is analyzed and it is immune against the white noise and the interference signal having larger frequency difference with the intrinsicfrequency of chaotic oscillator. And proportional differential control is used to regulate the system to periodic state and the method of spectrum analysis to detect the unknown frequency. The simulation result verified that the presentedmethod is effective and it is very feasible.
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Design of On-line UPS Based on Boost Converter
Chunyang Gu,Zhibing Yang,Chunling Yang,Mengda Yang 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Design and build up a new on-line digital UPS based on boost topological structure with a new kind of single-chip computer, STC12C5412AD, realizing sine wave and square wave output, and shifting among 50Hz, 60 Hz, and 400Hz of the supply for adopting into different industrial standards and applications. Such UPS system contains the module of intelligent charging from storage battery and thorough security functions, characterized by the output of un-interruption and high stability, low distortion, free of interference, low cost and multi-function.
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Finite-time Peak-to-peak Gain Minimization
Honghai Wang,Chunling Wang,Yang Zheng,Zihong Chen,Shuping He 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.2
The finite-time peak-to-peak filtering problem is studied for a class of linear dynamic systems. By reconstructingthe system, the dynamic filtering error system is obtained. Our aim is to design a peak-to-peak filtersuch that the induced L∞ gain from the unknown disturbance to the estimated errors is minimized with respect tothe finite-time interval. By using a proper Lyapunov function, sufficient conditions are established on the existenceof peak-to-peak filter which also guarantees the finite-time boundedness of the filtering error dynamic systems. Thedesign criteria are presented in the form of linear matrix inequalities and then described as an optimization problem. Simulation results are given to illustrate the validity of the proposed approaches.
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Li Xin,Wang Chunling,Liu Jiawei,Guo Yu,Cheng Fei,Yang Yanjie,Yan Zhengnan 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.6
Optimizing light conditions is critical for plant growth and seedling production in greenhouse, especially in seasons when the sunlight is insuffi cient. In the present study, tomato ( Solanum Lycopersicum cv. Fenbeibei) seedlings were grown at two levels of supplementary light duration of 6 h·d − 1 (short) (07:00–10:00 and 15:00–18:00) or 12 h·d − 1 (long) (04:00–10:00 and 15:00–21:00) provided by white light-emitting diodes (LEDs, white long and white short, WL and WS) or combinations of white and blue LEDs (white & blue long and white & blue short, WBL and WBS) with same supplementary daily light integral (at 5.5 mol m − 2 d − 1 ) after sowing, and tomato seedlings grown under sunlight only were set as the control. The per centages of light intensity provided by white and blue LEDs under the WB treatments were 85% and 15%, respectively. The results indicated that tomato seedlings grown under WBL treatment exhibited the lowest plant height and shortest hypocotyl length, which was decreased by 34.6% and 41.8%, respectively, compared with the control. The chlorophyll a, chlorophyll b, and total chlorophyll contents of tomato seedlings grown under WBL were signifi cant higher than those under other treat ments. The root fresh weight, root dry weight, and the stem fi rmness of the greenhouse-grown tomato seedlings under WBL were increased by 21.5%, 41.2%, and 38.6%, compared with those grown under WBS, respectively. The sucrose content of tomato seedlings under WBL was increased by 60.4%, compared with that under WL. In conclusion, 12 h·d − 1 supplementary light provided by combinations of white and blue LEDs led to compact morphological characteristics, superior mechanical properties, and satisfactory growth performance. Our fi ndings provide an available lighting strategy to obtain the desired morphological and quality properties of tomato seedlings grown in the seasons with insuffi cient light.
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