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The Design and Practice of Expert System of Exercise Prescription
( Bing Zhang ) 한국체육학회 2016 국제스포츠과학 학술대회 Vol.2016 No.1
Purpose: Exercise prescription is designed to modulate acute exercise programming variables to create the adaptations desired by the individual or sport. With aerobic exercise prescription, the type of exercise, duration of exercise, frequency, and duration is adjusted. For resistance exercise prescription, the type of exercise, total session volume, rest period, frequency, and intensity are determined. Prescription of stretching and other activities is also commonly seen. Method: 1. The expert system has set up four sub-systems in accordance with different purposes as: the rehabilitation therapy system for people with chronic disease; the strength exercise system for body builder; the weight-losing system for people want slim body shape; the health promotion system for people who want improve their heart-lung capability endurance. 2. Built up a strong knowledge base with consultative function. Based on the collection of the authoritative academic information home and abroad in many subjects including sports science, nutrition, psychology , etc. the system has edited and summarized 70 articles. 3. Computer processing to make the expert system software come true.
A Co-design Study of Filters and Oscillator for Low Phase Noise and High Harmonic Rejection
Bing Zhang,Wenmei Zhang,Runbo Ma,Xiaowei Zhang,Junfa Mao 한국전자통신연구원 2008 ETRI Journal Vol.30 No.2
In this paper, we present a novel oscillator (OSC) design. Bandpass filters, which can suppress harmonics, are incorporated into a co-design with an OSC to improve the OSC phase noise and harmonic rejection. The proposed OSC/bandpass filter co-design achieves a phase noise of - 130.1 dBc/Hz/600 kHz and harmonic rejection of 37.94 dB and 40.85 dB for the second and third harmonics, respectively, as compared to results achieved by the OSC before co-design of - 101.6 dBc/Hz/600 kHz and 21.28 dB and 19.68 dB. Good agreement between the measured and simulated results is achieved.
Xi Chen,Shenghua Huang,Dong Jiang,Bingzhang Li 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.5
In this paper, a novel neutral-point voltage balancing scheme for NPC three-level inverters using carrier-based sinusoidal pulse width modulation (SPWM) method is developed. The new modulation approach, based on the obtained expressions of zero sequence voltage in all six sectors, can significantly suppress the low-frequency voltage oscillation in the neutral point at high modulation index and achieve a fast voltage-balancing dynamic performance. The implementation of the proposed method is very simple. Another attractive feature is that the scheme can stably control any voltage difference between the two dc-link capacitors within a certain range without using any extra hardware. Furthermore, the presented scheme is also applicable to the single-phase NPC threelevel inverter. It can maintain the neutral-point voltage balance at full modulation index and improve the voltage-balancing dynamic performance of the single-phase NPC three-level inverter. The performance of the proposed strategy and its benefits over other previous techniques are verified experimentally.
Chen, Xi,Huang, Shenghua,Jiang, Dong,Li, Bingzhang The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.5
In this paper, a novel neutral-point voltage balancing scheme for NPC three-level inverters using carrier-based sinusoidal pulse width modulation (SPWM) method is developed. The new modulation approach, based on the obtained expressions of zero sequence voltage in all six sectors, can significantly suppress the low-frequency voltage oscillation in the neutral point at high modulation index and achieve a fast voltage-balancing dynamic performance. The implementation of the proposed method is very simple. Another attractive feature is that the scheme can stably control any voltage difference between the two dc-link capacitors within a certain range without using any extra hardware. Furthermore, the presented scheme is also applicable to the single-phase NPC three-level inverter. It can maintain the neutral-point voltage balance at full modulation index and improve the voltage-balancing dynamic performance of the single-phase NPC three-level inverter. The performance of the proposed strategy and its benefits over other previous techniques are verified experimentally.