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DC/DC 컨버터의 단락특성을 반영한 저압직류계통의 단락용량 산출방안에 관한 연구
오찬혁,이기연,채동주,임승택 대한전기학회 2023 전기학회논문지 Vol.72 No.11
In recent years, many studies have been conducted on DC distribution systems and commercialization attempts have been made, but they suffer from the lack of requirements for low-voltage direct current. This paper proposes a short-circuit capacity calculation method for low-voltage direct current systems by considering the short-circuit characteristics of DC/DC converters. In order to consider the different short-circuit fault behaviors of each converter, the equivalent capacitor capacity of the output terminal of the converter and the maximum output current of the converter are provided by the converter manufacturer. Using this, the short-circuit capacity is calculated by mixing the short-circuit characteristics of the converter output terminal capacitor and the short-circuit current supply characteristics due to the switching control of the converter. The proposed method is verified using Matlab/Simulink simulation to examine the appropriateness of the short-circuit capacity calculation method using the proposed method.
오찬혁 江南大學 不動産學科 1989 不動産學報 Vol.5 No.1
현대국가는 그 복리국가적 성격으로 말미암아 정도의 차이는 있을지라도 행정권의 확대·강화를 특색으로 하는 행정국가임을 특징으로 하고 있다. 따라서 행정기능의 확대경향과 더불어 행정활동형식도 다양화되고 있다. 권력적행정수반외에 행정계약, 행정조사, 행정사법, 행정지도등의 비권력적 수반내지 사법적 또는 법외적권력수단 그리고 행정상입법, 행정계약, 행정처분등의 공정성을 보호하기 위한 행정절차의 등장이 그 예라 할 수 있다. 그러나 행정의 활동형식이 다양해지고 있기는 하나 그중에서도 행정행위 가장 중요한 위치를 차지 하고 있음에는 변화가 없는 것으로 보인다.
오찬혁,유병철,이명진,강성홍 보건의료산업학회 2021 보건의료산업학회지 Vol.15 No.2
Objectives: This study analyzeds the prevalence and related factors of depression among young people. Methods: A total of 54,215 people aged 19-39 were surveyed in the community health survey, and 47,239 were finally included. Frequency analysis, composite sample cross-section analysis, and composite logistic regression were done using SAS 9.4. ver. Results: Marriage status, education level, basic living beneficiaries, smoking, high-risk drinking, attitudes to the local social and physical environment, social environment, and social activities were found to be statistically-significantly associated with the prevalence of depression among the youth Conclusions: Attention is required in various areas to prevent and alleviate depression, and we need more research is required to help gain insight regarding ways to prevent depression among the youth that can help prevent depression among the youth and help them cope with it at national and regional levels.