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산업용 소형디젤엔진의 터보차저 압축기의 파울링 현상 분석을 위한 실험적 연구
김바다(Bada Kim),조일환(Ilhwan Jo),이대엽(Daeyup Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The interest in air pollution and ultrafine dust is increasing. Emission regulations for automobiles and construction machinery are being strengthened globally. The blowby gas discharged from the crankcase of the engine is a gas that passes through the piston-cylinder gap and escapes into the crankcase. In the CCV ventilation system, carbon is deposited in the diffuser of the turbocharger wheel and the 압축기 housing, which lowers the charging efficiency from a long-term point of view and adversely affects engine performance and emission. This phenomenon is defined as Turbocharger Fouling or Turbocharger Oil Coking. In this study, the engine test was conducted on the dynamometer to investigate the mechanism and the root cause of the turbocharger fouling.
김바다 ( Bada Kim ),강숙영 ( Sookyoung Kang ),유다종 ( Dajong Yoo ) 관광경영학회 2020 관광경영연구 Vol.98 No.-
The purpose of this study is to identify the relationship between the quality of tourism performance, experiential value, and repurchase intentions felt by foreign tourists who watched Korean tourism performance, and further to propose theoretical and practical implications that will help create a new consumer market in the performance tourism industry in Korea. In order to achieve the purpose of this study, prior research on tourism performance quality, experiential value, repurchase intention, and the relationships between each others were analyzed. Foreigners who have visited Korea and watched tourism performances were distributed with questionnaires written in four different languages, and an empirical analysis was performed using SPSS v.21.0 with 236 valid samples out of 300 samples collected in the survey. Frequency analysis, factor analysis, reliability analysis, and multiple regression analysis of the collected data were conducted. This study demonstrated that the quality of tourism performances has partially positive effects on the experiential value, and that the quality of tourism performances and the experiential value of tourism performance have a significant effect on the repurchase intention. Future studies should contribute to establishing a theoretical framework, carrying out practical discussions and improving the satisfaction of foreign tourists through academic discussions in the field of tourism performance. Theoretical and empirical research on boosting tourism performance is also needed, as this is expected to mean more to the development of tourism in Korea.
아버지의 양육스트레스가 양육행동에 미치는 영향 : 정서조절양식의 매개효과
김미숙 ( Kim Misuk ),김바다 ( Kim Bada ) 열린부모교육학회 2016 열린부모교육연구 Vol.8 No.4
본 연구는 아버지의 양육스트레스와 양육행동 간의 관계에서 아버지의 정서조절양식의 매개효과를 살펴보고자 하였다. 이를 위해 경기도에 위치한 어린이집 및 유치원에 다니는 영유아 203명의 아버지를 대상으로 설문조사를 실시하였다. 수집된 자료를 분석하기 위하여 SPSS 23 통계 분석을 실시하였고, Pearson 상관분석,과 매개효과를 분석했다. 연구결과 첫째, 아버지의 양육스트레스와 양육행동, 정서조절양식 간의 유의미한 상관관계가 있는 것으로 나타났다. 둘째, 아버지의 양육스트레스가 애정적 양육행동, 독립성지향 양육행동에 미치는 영향에 있어서 능동적 정서조절양식이 부분 매개를 하는 것으로 나타났다. 이러한 결과는 아버지의 정서조절양식이 양육스트레스와 양육행동을 매개하는 중요한 요인임을 암시하며 아버지에게 정서조절에 대한 교육과 지원이 필요함을 시사한다. 뿐만 아니라 아버지의 양육스트레스를 감소하기 위한 육아휴직제도와 같은 다양한 자원과 기회를 제공해야한다. The current study aims to investigate the mediating effect of fathers` emotional regulation in the relationship between fathers` parenting stress and parenting behavior. To explore the effect, survey was conducted among 203 fathers of infants and young children in childcare centers and kindergartens in Gyeonggi-do. For the analysis of datas, SPSS statistical analysis was performed. Pearson correlations and mediation effects were analyzed. The results of the analysis are as follows.: First, there is meaningful correlation among fathers` parenting stress, fathers` parenting behavior, and fathers` emotional regulation. Second, Fathers` parenting stress on parenting of affection and parenting of independence oriented was significantly effective. And, only active emotion regulation style has mediating effects on parenting of affection and parenting of independence oriented. These results suggest that the style of father`s emotional regulation is very important to mediate between parenting stress and parenting. Thus, active style of emotional regulation is mostly effective in that it mediate father`s parenting stress and influence on parenting. These results imply that fathers should need education of emotional regulation as well as supports for it. On the other hand, father must have many resources and opportunity to decrease parenting stress such as Child Care Leave System,
Poly-TPD/PVK 이중 박막 정공수송층 구조의 양자점발광다이오드
김현수,이도형,김바다,황보람,김창교,Kim, Hyun Soo,Lee, Do Hyung,Kim, Bada,Hwang, Bo Ram,Kim, Chang Kyo 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.5
A poly[bis(4-butypheny)-bis(phenyl)benzidine] (poly-TPD) and poly(9-vinylcarbazole) (PVK) bilayer was employed as a hole transport layer (HTL) in solution-processed CdSe/ZnS quantum dot light-emitting diodes (QLEDs). The thickness of the PVK layer spin-coated onto the poly-TPD layer, whose thickness was fixed to 40 nm, was varied, with PVK layer thicknesses of 0 nm, 35 nm, 45 nm, and 55 nm. Because the thickness of the PVK can determine the hole transport properties of the HTL, a PVK thickness that maximizes the performance of the HTL for the QLEDs was investigated. By employing the optimized PVK thickness of 45 nm, the current efficiency of the QLED exhibited a 1.74 times improvement when compared with that of the QLED with poly-TPD based HTL without PVK. This was mainly attributed to the decrease in the energy barrier between the HTL and the quantum dot (QD) emitting layer (EML).
불꽃점화 엔진의 흡기관 분사를 위한 매립지가스 분사량의 측정 및 계산
김경수(Kyoungsu Kim),최경호(Kyungho Choi),전원일(Wonil Jeon),김바다(Bada Kim),이대엽(Daeyup Lee) 한국가스학회 2021 한국가스학회지 Vol.25 No.4
쓰레기 매립지에 발생하는 매립지가스(Landfill gas)를 대기 중으로 방출할 경우에 매립지가스에서 많은 부분을 차지하고 있는 지구온난화 지수(global warming potential)가 높은 메탄가스를 배출하게 되어 기후변화에 악영향을 주게 되고, 매립지가스에 함유되어 있는 메탄을 내연기관의 연료로 활용하여 연소하여 발전을 하게 되면 이산화탄소 형태로 대기 중으로 배출하게 되어 온난화 지수를 낮추는 데도 기여를 할 수 있게 된다. 따라서 매립지가스를 내연기관을 이용한 발전용 연료로 사용하기 위해서 엔진의 열효율을 높이는 것이 중요하기 때문에 기존의 믹서 방식 기술을 이용한 연료공급 방식보다는 실린더별로 흡기포트에서 전자 제어 인젝터를 이용하여 기체 분사를 하는 방식의 연료공급 시스템을 사용하는 것이 필요하게 된다. 따라서 전자 제어 기체 분사 방식 기술을 이용하기 위해서는 매립지가스의 사용 조건에 따른 질량 유량을 정확히 측정하는 것이 중요하게 된다. 이를 위하여 본 연구에서는 매립지가스를 기체 분사할 경우에 분사량을 측정 및 계산하는 연구를 수행하였다. When the landfill gas generated at the landfill site is released into the atmosphere, methane gas with a high global warming potential is emitted, which adversely affects climate change. When methane contained in landfill gas is used as fuel for internal combustion engines and burned to generate electricity, it is emitted into the atmosphere in the form of carbon dioxide, which can contribute to lowering the global warming potential. Therefore, in order to use the landfill gas as fuel for power generation using an internal combustion engine, it is important to increase the thermal efficiency of the engine. Thus, it is necessary to use a fuel supply system in which gas is injected using an electronically controlled injector at an intake port for each cylinder rather than a fuel supply technology using the conventional mixer technology. In order to use the electronically controlled gas injection method, it is important to accurately measure the mass flow rate according to the conditions of using landfill gas. For this, a study was conducted to measure the injection amount and calculate them in order for the intake port gas injection of landfill gas.