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M. Rukonuzzaman,Mutsuo Nkaoka 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.1
An advanced active power filter for the compensation of instantaneous harmonic current components in nonlinear current load is presented in this paper A novel signal processing technique using an adaptive neural network algorithm is applied for the detection of harmonic components generated by three-phase nonlinear current loads and this method can efficiently determine the instantaneous harmonic components in real time The control strategy of the switching signals to compensate current harmonics of the three-phase inverter is also discussed and its switching signals are generated with the space voltage vector modulation scheme. The validity of this active filtering processing system to compensate current harmonics is substantiated on the basis of simulation results
Rukonuzzaman, M.,Nakaoka, Mutsuo The Korean Institute of Power Electronics 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.1
An advanced active power filter for the compensation of instantaneous harmonic current components in nonlinear current load is presented in this paper. A novel signal processing technique using an adaptive neural network algorithm is applied for the detection of harmonic components generated by three-phase nonlinear current loads and this method can efficiently determine the instantaneous harmonic components in real time. The control strategy of the switching signals to compensate current harmonics of the three-phase inverter is also discussed and its switching signals are generated with the space voltage vector modulation scheme. The validity of this active filtering processing system to compensate current harmonics is substantiated on the basis of simulation results.
J.Yoshitsugu,M.Ando,M.Rukonuzzaman,E.Hiraki,M.Nakaoka,K.Inoue 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents a circuit of the quasi-resonant DC link to achieve soft-switching three phase inverter using intelligent IGBT power module. The soft-switching operation in this circuit is confirmed simulation and experimental results. Its conductive noise is measured for electrical AC motor drive as compared with that of the conventional hard switching inverter.<br/>
Manabu KurokaWa,Claudio Y.Inaba,M.Rukonuzzaman,Eiji Hiraki,Yoshihiro Konishi,Mutsuo Nakaoka 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.2
The purpose of this paper is to improve power conversion efficiency of three-phase soft-switching voltage-source inverter with an auxiliary resonant de link (ARDCL) snubber circuit Firstly, the operating principle of ARDCL snubber circuit is described. Secondly, this paper proposes an effective generation method of zero voltage vector for three-phase voltage-source soft-switching inverter m which power losses in the ARDCL snubber circuit can be reduced. In particular, zero voltage holding interval in the inverter DC busline can be controlled due to the new generation scheme of zero voltage vector Thirdly, a simulator for power loss analysis, which includes switching and conduction loss characteristics based on actual system, is developed The validity of developed simulator is proved with experimental results Finally, power efficiency of three-phase inverter is estimated according to high carrier frequency by using the simulator
Juvenile Polyps in Bangladeshi Children and Their Association with Fecal Calprotectin as a Biomarker
Subarna Rani Das,A S M Bazlul Karim,Md RukonUzzaman,Md Wahiduzzaman Mazumder,Rubaiyat Alam,Md Benzamin,Parisa Marjan,Mst. Naznin Sarker,Hazera Akther,Mohuya Mondal 대한소아소화기영양학회 2022 Pediatric gastroenterology, hepatology & nutrition Vol.25 No.1
Purpose: Colonoscopy is considered the most reliable method for the diagnosis of juvenile polyps. However, colonoscopic screening is an invasive and expensive procedure. Fecal calprotectin (FCP), a marker of intestinal inflammation, has been shown to be elevated in patients with polyps. Therefore, this study aimed to evaluate FCP as a screening biomarker for the diagnosis of juvenile polyps. Methods: This cross-sectional, observational study was conducted at the Pediatric Gastroenterology and Nutrition Department, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh. For children with polyps, colonoscopic polypectomy and histopathology were performed. FCP levels were analyzed before and 4 weeks after polypectomy in all patients. Information was recorded in a datasheet and analyzed using the computer-based program SPSS. Results: The age of the children was between 2.5 and 12 years. Approximately 93% of the polyps were found in the rectosigmoid region. Children with juvenile polyps had elevated levels of FCP before polypectomy that subsequently normalized after polypectomy. The mean FCP levels before and after polypectomy were 277±247 μg/g (range, 80–1,000 μg/g) and 48.57±38.23 μg/g (range, 29–140 μg/g) (p<0.001), respectively. The FCP levels were significantly higher in patients with multiple polyps than in those with single polyps. Moreover, mean FCP levels in patients with single and multiple polyps were 207.6±172.4 μg/ g and 515.4±320.5 μg/g (p<0.001), respectively. Conclusion: Colonic juvenile polyps were found to be associated with elevated levels of FCP that normalized after polypectomy. Therefore, FCP may be recommended as a noninvasive screening biomarker for diagnosis of colonic juvenile polyps.