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조웅래,김희경 (사)위기관리이론과실천 2023 Journal of Safety and Crisis Management Vol.13 No.5
This study investigated the effects of impulsiveness, depression and distress tolerance on problematic drinking of undergraduate students. A total of 433 participants took part in the online survey. Problematic drinking had a significant positive correlation with impulsiveness, depression, and a significant negative correlation with distress tolerance. According to the process macro analysis, distress tolerance showed a significant partial mediating effect in the effect of impulsiveness on problematic drinking and the effect of depression on problematic drinking. The moderated mediating effect of gender was significant in the effect of impulsiveness on problematic drinking through distress tolerance, and the influence was greater in male than female. The moderated mediating effect of gender was not significant in the effects of depression and distress tolerance on problematic drinking. These results suggest that gender should be considered in the intervention for problematic drinking, and that it is important to reduce impulsiveness and depressed mood and strengthen the ability to tolerate distress in order to reduce problematic drinking in male undergraduates.
Effect of cyclic loading and retightening on reverse torque value in external and internal implants
조웅래,허윤혁,박찬진,조리라 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.4
PURPOSE. The aim of this study was to evaluate the effect of cyclic loading and screw retightening on reverse torque value (RTV) in external and internal type implants. MATERIALS AND METHODS. Cement-retained abutments were connected with 30 Ncm torque to external and internal type implants. Experimental groups were classified according to implant connection type and retightening/loading protocol. In groups with no retightening, RTV was evaluated after cyclic loading for 100,000 cycles. In groups with retightening, RTV was measured after 3, 10, 100 cycles as well as every 20,000 cycles until 100,000 cycles of loading. RESULTS. Every group showed decreased RTV after cyclic loading. Before and after cyclic loading, external type implants had significantly higher RTVs than internal type implants. In external type implants, retightening did not affect the decrease in RTV. In contrast, retightening 5 times and retightening after 10 cycles of dynamic loading was effective for maintaining RTV in internal type implants. CONCLUSION. Retightening of screws is more effective in internal type implants than external type implants. Retightening of screws is recommended in the early stage of functional loading.
3way LP EGR의 차압센서 위치 선정에 대한 연구
조웅래(Ungrae Cho),이은열(Eunyeol Lee),남지현(Jihyun Nam) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
Vehicle emissions regulations, especially about NOx, are getting stronger day by day. That’s why LP EGR system has been studied importantly today. This system can reduce NOx and improve fuel efficiency by recirculating low temperature and low pressure exhaust gas. In order to that functions clearly, it’s important to select the optimal position of Differential Pressure Sensor mounted LP EGR valve because that sensor helps to estimate the flow rate by measuring the front and the rear differential pressure of LP EGR. This paper presents optimal position of Differential Pressure Sensor in LP EGR by CAD and CAE.
[디젤엔진부문] 개조된 디젤 LPG엔진에서 부탄 및 프로판연료의 연소특성 연구
조웅래(Unglae Cho),정연종(yonjong Chung),최경호(Gyeungho Choi) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
The purpose of this study was to investigate characteristics of combustion and exhaust gas temperature with butane and propane fuel in LPG conversion engine from diesel. A conventional diesel engine was modified to a LPG(Liquified Petroleum Gas) engine that LPG fuel system was set instead of diesel fuel injection pump. Study was performed with different compositions of butane and propane such as butane 100%, propane 100%, .butane 50% propane 50%, butane 70% - propane 30% and butane 30% - propane 70% fuel blends. The major conclusion of this work include; (i) MET spark ignition timing was same with different butane/propane fuel blends except butane 1000/0, 1200 rpm condition. (ii) engine torque and power were not influenced by varied butane/propane fuel blends. (iii) finally, exhaust gas temperature was increased by higher engine speed, it also was decreased by maximum 15℃ with different butane/propane fuel blends.<br/>
[디젤엔진부문] 다기통 LPG 기관에서 배기온도 저감 연구
조웅래(Unglae Cho),최경호(Gyeungho Choi) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this study was to investigate about reduction of exhaust gas temperature in LPG engine. A conventional diesel engine was modified to a LPG(Liquified Petroleum Gas) engine that LPG fuel system was set instead of diesel fuel injection pump. Study was performed with measure of exhaust gas temperature by change spark ignition timing, air-fuel ratio and compression ratio. The major conclusion of this work include; (i) exhaust gas temperature is decreased and power is increased with the advanced spark ignition timing and the high compression ratio; (ii) exhaust gas temperature is decreased with lean and rich air-fuel ratio; (iii) finally, one of the important parameters in reduction of exhaust gas temperature is spark ignition timing among the parameters in this study.