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급성일산화탄소 중독증에 병발된 폐부종에 대한 임상적 고찰
정기석,김준우,심영수,한용철 대한내과학회 1986 대한내과학회지 Vol.30 No.5
409 patients with acute CO poisoning were reviewed, for clinical manifestations, incidence and possible mechanism of complicated pulmonary edema. The following results were observed; 1) The incidence of pulmonary edema complicating acute CO poisoning was 4.9% (20 out of 409) and no significant difference in age and sex distribution between pulmonary edema and control group was found. 2) The mean PaO₂ in pulmonary edema group was 52.2 mmHg which was markedly decreased comparing with 80.0 mmHg in control group, But there was no significant difference in PaCO₂ and pH between two groups. 3) Tbe increase of HbCO level had a close relationship with development of pulmonary edema and the incidence of pulmonary edema was markedly increased when HbCO was over 50%. 4) The prognoeis was worse in pulmonary edema group, but the severity of chest X-ray finding was not considered as a prognostic factor.
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A Study on the Statistical Life Span Estimation of Aged Low-Voltage Circuit Breakers
정기석,Youngseok Kim,Chongmin Kim,Ohmin Kwon 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
In this study, aged low-voltage breakers, including earth leakage breakers (ELBs) and molded case circuit breakers (MCCBs) with high rates of electrical fi re occurrences, were collected from a fi eld site and tested according to failure identifi cation test criteria. Based on the International Electro technical Commission (IEC)’s failure judgment test criteria, pass or fail tests include lever repeat operations, the manual trip button for fi nding mechanical deformations and leakage sensitivity current test, the ELB earth leakage trip time test, and the MCCB overcurrent trip test to verify changes in electrical performance. The fault data obtained from the tests, expressed in years (yr), were analyzed for statistical life span prediction (SLP) using the Weibull distribution probability. The SLP analysis verifi ed the fault data set’s distribution suitability and derived the mean time to failure (MTTF) using the Minitab statistical analysis tool. Sample analysis of aged low-voltage breakers determined that approximately 73% of the samples were found in homes, and their MTTFs were 19–23 year, longer than those suggested in the literature. The predicted life span of an ELB was also approximately 4 yr shorter than an MCCB, possibly due to the mechanical and electrical shock of internal electronic devices caused by the manual trip button test and the deteriorating electrolytic capacitors of some printed circuit boards (PCBs).
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