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RISS 인기검색어
- 검색키워드
- 저자 : Cai Tianfang (검색결과 3 건)
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Wireless Sensor Network Achieved by Automatic Positioning System Node
Yang Zhongguo,Cai Tianfang 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.2
In application of wireless sensor network, the position information of sensor node is crucial within life cycle in the whole network. In order to design algorithm of node positioning with high-efficiency, high-precision and low-consumption, this paper puts forward using the encryption algorithm of space control node originally applied in field of engineering measurement, by using SDI algorithm ( space and distance intersection algorithm) as three-dimensional position algorithm used in system to achieve three-dimensional automatic positioning calculation of distributed nodes. Test proves that this kind of algorithm has better positioning nature and higher precision; it is used as three-dimensional positioning because it has good engineering application value.
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The Research on Smart Home’s Wireless Control Mechanism
Yang Zhongguo,Cai Tianfang 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.6
In order to improve smart home’s wireless control measure and overall level of smart home, the current concerned problem is to design a wireless network protocol that is low-cost, easy to develop and oriented to the field of smart home. The paper puts forward the general framework of smart home’s wireless control on smart home’s wireless control protocol and specific applications, and designs hardware and network structure for this system. By combining with design and algorithm implementation of repeaters, the paper improves WSN routing protocol, which is based on applications of smart home, and geographical routing protocol, which is appropriate for this scene. Meanwhile, the paper applies double bounce greedy algorithm and routing void mark to improve the problem of routing void. In this way, it avoids from the generation of routing void to the greatest extent. Through the simulation experiment, it can draw a conclusion that comparing with GPSR protocol and GEAR protocol, the improved protocol has a great improvement on node energy consumption and effective avoidance of routing void. It makes network performance improve to a greater degree. Before deploying smart home’s network nodes, it should pay more attention to deploy the number of nodes. In appropriate node deployment, better network performance of smart home can be obtained.
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Research on Radial Force of Permanent Magnet Synchronous Motor Based on Maxwell
Zhongguo Yang,Wei Li,Yanan Gou,Tianfang Cai 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
In the existing permanent magnet motor drive system, the vibration and noise problems caused by motor and driver are more and more obvious and complex. Among them, the radial electromagnetic force fl uctuation problem of permanent magnet synchronous motor (PMSM) stator is the most important cause of vibration and noise. The radial electromagnetic force fl uctuation of PMSM stator is the main source of vibration and noise. In order to lay a solid foundation for studying the distribution of vibration and noise, the radial electromagnetic force of 12 slot 14 pole PMSM is calculated by combining Maxwell stress method and Lorentz force method. Based on the Maxwell platform, a solution model is established to analyze the radial electromagnetic force of motor in time and space. The time–space analysis diagram of radial electromagnetic force in no-load section and load section is given; it is helpful to avoid resonance point and realize low-noise design of motor.
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