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아동기 대인간 외상경험이 대학생의 사회적 상호작용 불안에 미치는 영향: 고통감내력의 매개효과를 중심으로
정재우(Jaewoo Jeong),장은진(Eun Jin Chang) 한국발달지원학회 2021 발달지원연구 Vol.10 No.2
본 연구는 아동기 대인간 외상경험이 대학생의 사회적 상호작용 불안에 미치는 영향을 고통감내력이 매개하는지를 살펴보고자 하였다. 이를 위해 서울, 대전, 충북지역에 소재한 4년제 대학교에 재학 중인 324명의 대학생들을 대상으로 아동기 외상 질문지(Childhood Trauma Questionnaire: CTQ), 사회적 상호작용 불안 척도(Social Interactive Anxiety Scale: SIAS), 한국판 고통감내력 부족 척도(Korean Distress Intolerance Index: K-DII)를 실시하였다. 각 변인들 간의 관계를 살펴보기 위해 SPSS를 통해 기술통계분석과 Pearson 상관분석을 실시하였고, AMOS를 사용하여 구조방정식 모형을 검증하였다. 마지막으로, 부트스트랩 기법을 통해 모형의 유의성을 검정하였다. 연구결과는 첫째, 아동기 대인간 외상경험, 고통감내력 부족, 사회적 상호작용 불안 간에는 서로 유의미한 정적 상관이 있었다. 둘째, 아동기 대인간 외상경험은 사회적 상호작용 불안에 직접적으로 영향을 줄 뿐 아니라, 고통감내력 부족을 매개로 하여 사회적 상호작용 불안에 간접적으로 유의한 영향을 미치는 것으로 확인되었다. 이는 아동기 대인간 외상경험이 사회적 상호작용 불안에 영향을 미치는 과정에서 고통감내력이 부분매개변인의 역할을 한다는 것을 의미한다. 마지막으로, 결과에 따른 본 연구의 제한점 및 추후 연구 방향에 대해 논의하였다. The purpose of this study was to examine distress tolerance‘s role in the effects of childhood interpersonal trauma experiences on social interactive anxiety. For this study, 324 college students attending four-year program universities in Seoul, Daejeon and Chungbuk Province examined the mediating effect of distress tolerance in relation to childhood interpersonal trauma experience and social interaction anxiety. For this study the SPSS 21.0 was used to examine the demographic characteristics and basic characteristics of each variable. It was also used to confirm that the assumption of the normal distribution was satisfied in the measurement variables. In addition, we used AMOS 21.0 to verify the structural equation model. As a result, there was a statistically significant correlation between childhood interpersonal trauma experience, lack of distress tolerance, and social interaction anxiety. As a result of the partial mediation effect, measured by structural equation, of lack of distress tolerance in the relationship between childhood interpersonal trauma experience and social interaction anxiety, the childhood interpersonal trauma experience not only directly affects social interaction anxiety but also indirectly influenced the social interactive anxiety through the distress tolerance. Finally, limitations of this study and suggestions for future research were discussed.
정재우(Jaewoo Chung),강정호(Jeongho Kang),김남호(Namho Kim),이호길(Hogil Lee),정동영(dongyoung Jeong),정수진(Soo-Jin Jeong),강우(Woo Kang) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Amount of PM from Diesel engine is restricted by regulations. So, many researched on the reduction method of PM from Diesel engine have been performed. But measurement of PM mass with MDT is very expensive and hard. So, in mant engine researches, Smoke meter or Opacimeter is used to measure smoke performances. In this study, relationships between tests results from 3type equipment(smoke meter, opacimeter, MDT) are introduced also effects of HC concentrations on the Total PM mass concentrations are investigated with total PM model.
디젤엔진을 이용한 2단 VGT 및 EGR 적용특성에 관한 실험적 고찰
정재우(Jaewoo Chung),강정호(Jeongho Kang),이호길(Hogil Lee),김남호(Namho Kim),정동영(Dongyoung Jeong) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this paper, it is discussed that the NOx and smoke emission performances in a Diesel engine equipped with 2-stage VGT(variable geometry turbocharger) and EGR loop systems of 2 types As the installation of 2 stage VGT system, intake air flow rate could be increased. So, Nox could be reduced by high EGR rate compared with the base single VGT system. And , in EGR loop type engine tests, characteristics of LP(low pressure) and HP(high pressure) EGR system with 2-stage VGT system have been investigated. In these tests, performances of Lp loop EGR system have been seriously effected by the back pressure caused by BPV(back pressure valve) angle and EGR loop system.
LP loop EGR 디젤 엔진의 EGR cooler 적용 특성
정재우(Jaewoo Chung),정동영(Dongyoung Jeong),김남호(Namho Kim),강정호(Chungho Kang),서영호(Youngho Seo),김병수(Byoungsu Kim),김태진(Taejin Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this study, an EGR system of EURO4 engine was modified to LP loop EGR system considering the minimize the pressure drop and LP EGR cooler application characteristics was investigated using various EGR cooler applications. As the investigation , LP EGR cooler fouling test was performed during 50 hr at LP loop EGR engine driving condition and as the fouling test result, EGR cooler fouling phenomena did not happened. Also, EGR gas cooling performance and pressure drop through EGR cooler was measured at engine test. From LP loop EGR engine tests, Engine fuel economy performance was improved about 4%∼7% compared with the base EURO 4 engine value at similar NOx emission level, And it is found that intake manifold temperature is effected by EGR cooler, EGR/ fresh air mixing and intercooler cooling capacity. On the other hand, EGR cooler has some effects on cooling the EGR gas upstream of EGR valve and compressor, EGR cooler restrict the gas temperature in LP EGR system and protect the LP EGR components. So high EGR rate could be realized by application of a LP EGR cooler. In Hybrid EGR system, monitoring of LP EGR fraction has been point out as a technical problem, so, in this study, a LP EGR mass flow rate measurement method using EGR cooler was made to attempt.
4기통 부분예혼합압축착화 디젤엔진에서의 과급과 EGR의 효과적 적용에 대한 연구
정재우(Jaewoo Chung),강정호(Jungho Kang),김남호(Namho Kim),정수진(Sujin Jeong),정진은(Jineun Jung),강우(Woo Kang) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
This study introduced the premixed compression ignition and combustion method and applied turbocharging and EGR to a four-cylinder diesel engine simultaneously in order to improve the NOx and smoke emission performance of the diesel engine. Furthermore, this study examined the exhaust performance improvement and EGR rate limit when a high EGR rate is set up in the HPL (high pressure loop) EGR system to increase the degree of understanding about the turbocharging and EGR in a diesel engine and to provide base data for the performance improvement of turbocharging and the EGR system. For these purposes, this study performed the performance test of a turbocharger, developed a surge limit model, and investigated the correlation between EGR and VGT (variable geometry turbocharger). With the result of this study, the emission performance could be improved by reducing the compression ratio and applying split injection in the four-cylinder diesel engine. In addition, it was found experimentally that the emission performance could be further improved through the application of high boost and high EGR rate. However, this study provided concrete technical requirements on new turbocharging and EGR systemsby presenting the test result that the technical considerations must be made on the surge limit and EGR rate control for the turbocharger when applying high boost and high EGR rate in existing HPL EGR systems.
정재우(Jaewoo Chung),김남호(Namho Kim),임창현(Changhyun Lim),정기윤(Kiyun Jeong) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.5-2
In this paper, Planetary gear equations of blended type PHEV(Toyota Prius PHEV) are constructed and evaluated. Also operating characteristics of key components like as an engine, driving motor, generator were investigated. As a result, engine starting speed is about 1000rpm and minimum power is about 11kw, and engine is operated within good efficiency region. And, on the mode investigations, driving motor operating power is higher compared engine power under 30kW tractive power conditions, and moter power and engine power fraction is about 0.685~0.82 at the conditions of over than tractive power 40kW.