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자동차용 윤활유의 내구성평가에 따른 물성 및 기관성능에 관한 연구
송호영(Ho Young Song),김기호(Kiho Kim),박종배(Jongbae Park),임태윤(Tae Yoon Lim),김재권(Jaigueon Kim),신성철(Sungcheol Shin) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6
This durability test was performed on about 12ℓ, 6 cylinder, Heavy Duty Engine satisfied with EURO 3 Emission Standard. This Study was conducted to evaluate engine oil property and engine performance for the heavy duty diesel engine. Test procedure and method was in accordance with modified CEC L-57-T97(OM441LA) Method. In this study, Engine power, Blowby Gas. A_F, TAN, KV and Metal Components were presented to evaluate relation with engine oil property changes and engine performance. Wear metal components were generally increased and Fe, Cu was sharply increased more than 1000%. Addictive metal components were generally increased about 20%. TAN, KV show a increasing trend on the whole. but Engine performance did not change. This results mean that property changes did not make effect on engine performance because those were not as enough as to affect engine performance.
대형디젤엔진오일의 내구시험에 따른 엔진 오일의 물성변화와 엔진 성능의 관계에 관한 연구
송호영(Ho Young Song),김기호(Giho Kim),김정환(Jeonghwan Kim),김재권(Jaigeoun Kim),신성철(Sungcheol Shin) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This Study was conducted to evaluate relation with engine oil property changes and engine performance for the diesel engine. This test was performed on about 12 ℓ, 6 cylinder. Heavy Duty Engine. And Low SAPS 10W30 Engine Oil was used. Test procedure and method was in accordance with modified CEC L-57-T97(OM441LA) Method. In this study, Engine power, Blowby Gas, A_F, TAN, KV and Metal Components were presented to evaluate relation with engine oil property changes and engine performance. TAN, KV and Metal Components were generally increased but Engine performance did not change. This results mean that property changes did not make effect on engine performance because those were not as enough as to affect engine performance.
지역아동센터 이용 아동의 스마트폰과다사용이 학교생활적응과 또래관계에 미치는 영향에 대한 자아존중감의 조절효과
신성철 ( Shin¸ Sung-cheol ),최인하 ( Choi¸ In-ha ),신연희 ( Shin¸ Yeon-hee ) 한국아동교육학회 2021 아동교육 Vol.30 No.4
본 연구는 지역아동센터 이용 아동의 스마트폰과다사용이 학교생활적응과 또래관계에 미치는 영향에 대한 자아존중감의 조절효과를 알아보고자 하였다. 이를 위해 대구ㆍ경북에 소재한 지역아동센터 이용 아동 중 초등학생 4∼6학년 420명을 대상으로 설문조사를 실시하였다. 수집된 자료를 분석한 결과 첫째. 스마트폰과다사용은 학교생활적응, 또래관계 및 자아존중감과 통계적으로 유의미한 부적상관이 있는 것으로 나타났고, 자아존중감과 학교생활적응, 또래관계 간에는 통계적으로 유의미한 정적 상관이 있는 것으로 나타났다. 둘째, 스마트폰과다사용이 학교생활적응과 또래관계에 미치는 부정적 영향을 자아존중감이 완충효과를 하고 있는 것으로 나타났다. 즉 스마트폰을 과다사용하는 아동이라도 자아존중감이 높으면 학교생활적응과 또래관계에 대한 부정적인 문제가 감소한다는 것을 의미한다. 이것은 스마트폰을 과다사용하는 아동들의 긍정적인 학교생활적응과 또래관계를 위해 스마트폰사용에 직접적으로 관여하기보다는 자아존중감을 높여 학교생활적응과 또래관계를 도울 수 있음을 시사하는 것이다. 한편 이러한 결과는 기존의 병리적 현상에 대한 초점과 관련하여 인간을 수동적인 관점에서 바라보는 것에서 인간을 능동적인 관점에서 스스로 조절 할 수 있는 힘이 있음을 인정하는 것이다. The purpose of this study was to investigate the moderating effect of self-esteem on the effects of excessive smartphone use by children using local children's centers on school life adjustment and peer relationships. For this purpose, a survey was conducted on 420 elementary school children in 4th-6th grades among children using local children's centers located in Daegu and Gyeongsangbuk-do. First, as a result of analyzing the collected data. There was a statistically significant negative correlation between overuse of smartphones, adaptation to school life, peer relations, and self-esteem, and statistically significant positive correlation was found between self-esteem, adaptation to school life, and peer relations. Second, it was found that self-esteem buffered the negative effects of overuse of smartphones on school life adaptation and peer relationships. In other words, even for Children in Community Child Center who use smartphones excessively, if their self-esteem is high, negative problems related to school life adaptation and peer relationships decrease. This suggests that adolescents who overuse smartphones can help them adapt to school life and their peer relationships by raising self-esteem rather than directly engaging in smartphone use for positive adaptation to school life and peer relationships. On the other hand, this result acknowledges that there is the power to self-regulate humans from an active point of view in relation to the focus on existing pathological phenomena.