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UPBI : An Efficient Index for Continues Probabilistic Range Query of Moving Objects on Road Network
Yaqing Shi,Jun Feng,Zhixian Tang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.5
With the development of mobile terminal technology, the continuous range query of moving objects on road network has been widely applied in the field of transportation, military and communication. In practical applications, the sampling frequency of positioning equipment could not eliminate uncertainty, resulting in moving objects’ position uncertainty between two adjacent samples. The index existing for continues probabilistic range query are based on the centralized or the traditional cluster distributed environment. In this paper, we construct UPBI index structure for the continuous probability range queries on road network based on Hadoop firstly. Secondly, we design the continuous probability range query parallel algorithm considering moving objects’ position uncertainty on road network. Finally, we simultaneously give space constraint R-restrict and the probability calculation method. The experiment demonstrates that index and query algorithm proposed effectively solve the mass data problem about moving objects, and enhance query efficiency.
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Wubin Kong,Haifeng Guo,Guangdi Tang,Zhixian Zhong 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
A non-sinusoidal power supply is usually applied in a multiphase induction motor drive in order to improve the torque density with harmonic current injection. The harmonic parameters in the motor are essential for harmonic current proportion derivation. In the present work, detailed inductance parameters are derived, and an optimized non-sinusoidal power supply is proposed based on harmonic parameter analysis. The traditional method considers only air-gap fl ux density distribution optimization, while the yoke fl ux density is ignored. The proposed method focuses on optimizing the air-gap fl ux density and yoke fl ux density simultaneously. The proposed method improves the stator iron utilization, and the torque density and effi ciency are enhanced under heavy loads. Finally, 15 kW and 630 kW nine-phase motor drives are constructed, and the proposed non-sinusoidal power supply control strategy is validated experimentally.
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