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요석의 일회 발생 환자군과 재발 환자군에서 요석대사 위험인자들의 비교
오승영,문영태 대한비뇨의학회 2004 Investigative and Clinical Urology Vol.45 No.6
Purpose: The aim of this study was to determine whether patients with recurrent stone formations have significant metabolic risk factors compared to patients with first-time stone formations. Materials and Methods: 456 patients who participated in the stone metabolic study at Chung-Ang University Hospital between January 1, 2001 and June 30, 2002 were selected as subjects. 347 patients (211 males, 136 females) with first-time stone formations and 109 patients (77 males, 32 females) with recurrent stone formations were selected. The blood test and 24-hour urine test were categorized and grouped according to: 1) gender; 2) age brackets of 40 and under, 40-49, and 60 and over; 3) and gender-based age bracket distribution. Results: Hypocitraturia was the most common metabolic abnormality in both males and females and in all age groups. Hypocitraturia, in particular, was shown to have more significant associations (p<0.05) in female patients in their 40s and 50s with recurrent stone formations (75%) compared to female patients of the same age range with first-time stone formations (38.6%). In addition, a small urine volume was found to have similar significant associations with these subject groups (p<0.05) with respect to patients with first-time stone formations and recurrent stone formations. Female Patients (especially those in their 40s and 50s) with recurrent stone formations (242.1±158.5) were found to have a higher probability (p<0.05) of hypocitraturia than patients with first-time stone formation (419.9±242.3). Conclusions: In women with recurrent stone formation, hypocitraturia and low urine volume are the risk factors that differentiate them from patients with first-time stone formation. The correction of hypocitraturia & low urine volume may significantly reduce the patients’ chances for recurrent stone formation. (Korean J Urol 2004;45:551-556)
오승영,김진수,오광영,Oh, Seung-Young,Kim, Jin-Soo,Oh, Kwang-Young 한국농공학회 2005 한국농공학회논문집 Vol.47 No.2
Characteristics of concentrations of total nitrogen (TN), total phosphorus (TP), and chemical oxygen demand (COD) pollutant in percolated water at four paddy field sites (Soro, Odong, Munui, and Boeun) were investigated by a nonparametric test. Percolation rate measurement and percolated water sampling were taken during irrigation periods at $5{\sim}10$ day intervals. The normality of percolation rate and pollutant concentrations were examined using histogram, boxplot, and the Kolmogorov-Smirnov (K-S) test. Pollutant concentrations in percolated water showed positively skewed distribution. The median concentrations of pollutant were 1.91 mg/L for TN, 0.021 mg/L for TP, and 6.6 mg/L for COD, which were lower than its arithmetic mean concentrations by $35\%$ for TN, $36\%$ for TP, and $13\%$ for COD. The median concentrations of TN and TP differed significantly among sample sites according to the Kruskal-Wallis test. However, median concentrations were not significantly different among month except for TN and TP of Soro and COD of Odong. The percolation load of pollutants during irrigation periods in the study area were estimated at $3.12{\sim}7.75\;kg/ha$ for TN, $0.033{\sim}0.155\;kg/ha$ for TP, and 10.7 kg/ha for COD, which were much lower than respective values reported in Japan.
수면 관리를 위한 웨어러블 IoT 기기의 사용성 평가 방법 제안
오승영,유선국,김용욱 조선대학교 공학기술연구원 2024 공학기술논문지 Vol.17 No.1
In this study, we develop a prototype of a wearable IoT device with sleep management function, perform an evaluation on it, and propose a method for evaluating the usability of wearable IoT devices. This evaluation method was developed by considering software evaluation in the medical device usability process (IEC 62366). Since it was observed that the evaluation results using the developed evaluation index showed the same tendency as the evaluation results using the existing commonly used evaluation index, the developed evaluation index is likely to be used as an evaluation index for wearable IoT devices in the future. In the future, we will add various functions to the prototype, increase the number of subjects, and conduct research through additional verification.