Sungkyunkwan University · 生化学・遺伝学・分子生物学
Professor Young-Ho Kim's research lab specializes in power electronics and renewable energy systems, with a focus on enhancing the efficiency and reliability of photovoltaic (PV) power conversion systems. The lab develops advanced control strategies for interleaved flyback inverters and synchronous rectifiers in PV ac modules, aiming to optimize performance across varying solar irradiance and load conditions. Additionally, the lab explores clinical applications of medical procedures, particularly in colonoscopy and gastrointestinal disease management, demonstrating a multidisciplinary approach combining engineering with biomedical applications. Recent work also examines the long-term outcomes and prognostic factors in early-onset colorectal cancer and neurodegenerative risks in inflammatory bowel disease patients.
Figures are computed from collected data and may differ slightly.
In this paper, a new control strategy for improving weighted efficiency in photovoltaic (PV) ac module-type interleaved flyback inverters (ILFIs) is proposed. The efficiency of the ILFI for PV ac modules has to be high, not only for the maximum power, but also for other power levels according to weather conditions. For PV power conversion efficiency improvement in all load ranges, a new control method for an ILFI according to the output of the PV module is proposed in this paper. The proposed me
The split-dose magnesium citrate-low-volume (2 liters) PEG regimen was more efficient than and preferred to the conventional regimen of 4 liters of PEG, and it was equally efficient as, but, again, preferred to the split-dose (2+2 liters) regimen for morning colonoscopy.
In this paper, a weighted-efficiency enhancement control method for an interleaved flyback inverter using a synchronous rectifier is proposed based on photovoltaic ac modules. In this control method, the operation of the synchronous rectifier is classified according to the voltage spike across the main switch. When the voltage spike across main switch is lower than the rating voltage of main switch, the operation of the active clamp circuit is interrupted to reduce the switching loss of the auxi
The risk of neurodegenerative diseases was higher in IBD patients than in the non-IBD population.
The prognosis of early-onset sporadic colorectal cancer (CRC) patients remains controversial. The objective of this study was to assess the long-term outcome and prognostic factors of sporadic CRC in young patients.From 2006 to 2011, 8207 patients underwent curative or palliative surgery for CRCs in our institution. A total of 693 patients who were ≤45 years old with sporadic CRC were enrolled as the young group. A total of 1823 patients aged between 56 and 65 years were identified as middle-age
Colonoscopy is preferred to sigmoidoscopy for diagnosis of CMV colitis. Antiviral therapy should not be mandatory for a subset of patients with CMV colitis.
A previous genome-wide methylation array for colorectal cancer (CRC) identified aberrant promoter methylation of eyes absent 4 (EYA4). However, the correlations between EYA4 methylation and gene expression, the role played by EYA4 protein in colorectal carcinogenesis, and results of the gene-enrichment and functional annotation analysis have not yet been established. We analyzed the EYA4 methylation status and found EYA4 promoter methylation in CRC cell lines (100%), CRC tissues (93.5%) and adva
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