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Adaptive Maximum Power Point Tracking Algorithm for Photovoltaic Power Systems
AHN, Chang Wook,CHOI, Ju Yeop,LEE, Dong-Ha,AN, Jinung The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.5
<P>This paper presents an adaptive maximum power point tracking (MPPT) algorithm. The aim is to dynamically adjust the step length for updating duty ratio (or operating voltage) so as to make full utilization of the output power of photovoltaic (PV) systems, even under the rapidly changing atmospheric conditions. To this end, the average slope in terms of voltage and power is exploited for reducing the harmful effect of noise and error (incurred in measurement or quantization) on the slope. Also, a statistical decision-making scheme is employed for reliably deciding the time instant at which atmospheric conditions actually change. Empirical study has adduced grounds for its dominance over existing references.</P>
인덕터의 DC 바이어스 특성을 고려한 대용량 DC-DC 컨버터의 손실계산
조영창(Young-Chang Jo),최주엽(Ju-Yeop Choi),정승기(Seung-Ki Jung),최익(Ick Choy),송승호(Seung-Ho Song) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
It is necessary to accurately predict converter losses for optimized design of a high-power DC-DC converter. The losses of switching devices and inductor among the elements of the converter take significantly greater proportion. The current ripple will be determined by the size of the inductance and this inductance value varies depending on the DC amount of inductor current. As the inductance changes according to load current, the change influences not only the inductor loss itself but also the total converter loss. In this paper, for more accurate design of a bi-directional DC-DC converter for 30㎾-class energy storage system, more accurate computational model is proposed considering inductance variation according to the load current change. The inductance changes using variable magnetic cores are verified and converter efficiency is tested through simulations and experiments.
만성 요통환자의 복부 심부근과 표재근을 중심으로 한 운동 효과 비교
김진산,이창현,조미주,임연욱,정취산,김선엽 대한정형도수치료학회 2005 대한정형도수물리치료학회지 Vol.11 No.1
Objectives: To compare the efficacy of two types specific exercise intervention (deep and superficial abdominal muscle exercises) in the treatment of patients with chronic low back pain (CLBP). Design: A randomized, comparative, repeated-measures. Subjects: Twenty-four patients with CLBP (at least for 3 months), mean age±SD=51.58±16.21 (yrs). Methods: Twenty-four patients with this condition were assigned randomly to two treatment groups. Both first and second group underwent 3 weeks specific exercise treatment program. The first group specific trained for the deep abdominal muscles. The second group specific trained for the superficial abdominal muscles. Results: After intervention, the first group showed a statistically significant reduction in pain intensity and functional disability levels (p<.05). The second group showed no significant change in these parameters after intervention (p>.05). Conclusions: According to results, a "deep abdominal muscle exercises" treatment approach appears more effective than a "superficial abdominal muscle exercises" treatment in patients with CLBP.
Ho Yeop Lee,Byeong Chang Sim,Ha Thi Nga,Ji Sun Moon,Jingwen Tian,Nguyen Thi Linh,Sang Hyeon Ju,Dong Wook Choi,Daiki Setoyama,이현승 대한내분비학회 2022 Endocrinology and metabolism Vol.37 No.6
Background: An excess of thyroid hormones in Graves’ disease (GD) has profound effects on systemic energy metabolism that are currently partially understood. In this study, we aimed to provide a comprehensive understanding of the metabolite changes that occur when patients with GD transition from hyperthyroidism to euthyroidism with methimazole treatment. Methods: Eighteen patients (mean age, 38.6±14.7 years; 66.7% female) with newly diagnosed or relapsed GD attending the endocrinology outpatient clinics in a single institution were recruited between January 2019 and July 2020. All subjects were treated with methimazole to achieve euthyroidism. We explored metabolomics by performing liquid chromatography-mass spectrometry analysis of plasma samples of these patients and then performed multivariate statistical analysis of the metabolomics data. Results: Two hundred metabolites were measured before and after 12 weeks of methimazole treatment in patients with GD. The levels of 61 metabolites, including palmitic acid (C16:0) and oleic acid (C18:1), were elevated in methimazole-naïve patients with GD, and these levels were decreased by methimazole treatment. The levels of another 15 metabolites, including glycine and creatinine,were increased after recovery of euthyroidism upon methimazole treatment in patients with GD. Pathway analysis of metabolomics data showed that hyperthyroidism was closely related to aminoacyl-transfer ribonucleic acid biosynthesis and branched-chain aminoacid biosynthesis pathways. Conclusion: In this study, significant variations of plasma metabolomic patterns that occur during the transition from hyperthyroidism to euthyroidism were detected in patients with GD via untargeted metabolomics analysis.
HCV core protein promotes liver fibrogenesis via up-regulation of CTGF with TGF-b1
Ju Yeop Shin,Wonhee Hur,Jin Sang Wang,Jeong Won Jang,Chang Wook Kim,Si Hyun Bae,Sung Key Jang,Se-Hwan Yang,Young Chul Sung,Oh-Joo Kwon,Seung Kew Yoon 생화학분자생물학회 2005 Experimental and molecular medicine Vol.37 No.2
Liver cirhosis is one of the major complications of hepatitis C virus (HCV) infection, but the me-chanisms underlying HCV-related fibrogenesis are stil not clear. Although the roles of HCV core protein remain poorly understood, it is supposed to play an important role in the regulation of celular growth and hepatocarcinogenesis. The aim of this study was to examine the role of HCV established an in vitro co-culture system with primary hepatic stellate cel (HSC) isolated from rats, and a stable HepG2-HCV core cell line which had been transfected with HCV core gene. The expressions of fibrosis-related molecules trans-forming growth factor β1 (TGF-β1), transforming growth factor β receptor II (TGFβRII), α-smoth muscle actin (α-SMA) and conective tisue growth factor (CTGF) were analyzed via histo-pression levels of matrix metaloprotinase-2 (MP- 2) and colagen type I (Col I) from the co-cultured media were measured by zymogram and ELISA, respectively. The expresions of α-SMA, TGF-β1, Col I, TGFβRII and MP-2 were significantly in-creased in the co-culture of stable HepG2-HCV core with HSC. Moreover, the significant increases of CTGF and TGF-β1 in the HCV core- expresing cels were observed by either Northern or Wes-tern blot analysis. These results sugest that HCV core protein may contribute to the hepatic fibro-via up-regulation of CTGF and TGF-β1.