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유재용 ( Jae-young Yoo ),윤재곤 ( Jae-gon Yun ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.4
HP-EGR which is used in the existing diesel engine is the method of circulating the emission gas burned at high pressure from the front end of turbine to the rear end of compressor, and LP-EGR which is applied to resolve the disadvantage of HP-EGR is adopted with the advantages of accomplishing relatively lower pressure and lower EGR gas temperature compared to HP-EGR system by recirculating the emission gas which does not have contaminants because of being passed through DPF. The objective of this study is to improve the existing maintenance method of simple sequential exchange of single part and present the way of enhancing the efficiency of maintenance through the method of analyzing the data with D-logger.
유재용(Jae-Young Yoo),박설현(Seul-Hyun Park) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.2
The objective of this study is to investigate the cooling characteristics of a heat sink for an LED headlight used in passenger cars. To this end, this study conducts the experimental and numerical analysis of the heat sink heated at constant heat fluxes without air flow applied. In the experiments, heat was transferred at a constant heat flux through the bottom of a heat sink. The measured temperature on pre-selected locations of the heat sink was in good agreement with the numerically predicted one. The experimental and numerical results indicate that the convective heat transfer coefficient for the natural convection mode was decreased by increasing the heat flux applied to the bottom of heat sink, lowering the cooling capabilities.
보건계열 대학생의 진로태도성숙도, 소명의식, 일의 의미가 대학생활적응에 미치는 영향
유재용(Jae Yong Yoo),박주영(Ju Young Park),우정희(Chung Hee Woo) 한국간호행정학회 2015 간호행정학회지 Vol.21 No.5
The aim of this study was to identify factors affecting student adjustment to college among students in health colleges (Nursing, Clinical Pathology, Radiology, Dental Hygienics, Medicine). Methods: The participants in this study were 261 students in Daejeon city. Data were collected from October 5 to October 14, 2014. A structured questionnaire was used for data collection and data was analyzed using the SPSS/WIN program. Results: Career attitude maturity, calling and work as meaning positively correlated with student adjustment to college. The significant predictors of student adjustment to college were career attitude maturity, calling, always working part-time, major in medicine and average grade for the last semester. Conclusion: These findings suggest that adjustment to college for students in health colleges is linked to career attitude maturity, and calling. College organization should develop a curriculum fostering a calling which will promote student adjustment to college and graduate health care professionals with desirable attitudes.
대학생의 질문저해요인과 비판적 사고성향 및 문제해결능력
우정희(Woo, Chung-hee),유재용(Yoo, Jae Yong),박주영(Park, Ju-young) 한국간호교육학회 2015 한국간호교육학회지 Vol.21 No.3
Purpose: The purpose of this study was to identify the relationship among hesitation factor of questions, critical thinking disposition, and problem solving. Methods: Data were collected from 370 students at a university in D city using a structured questionnaire from April 1 to April 15, 2015. It was analyzed with frequency analysis, descriptive statistics, t-tests, ANOVA, and correlation analysis. Results: Subjects scored an average of 2.62±.52 for hesitation factor of questions, 3.53±0.42 for critical thinking disposition, and 3.44±0.44 for problem solving. There were significant differences in the three variables according to satisfaction with major, self-expression, and interpersonal relationships. In addition, hesitation factor of questions exhibited a significant difference between genders. Hesitation factor of questions had a negative relationship with critical thinking disposition (r=-.23, p<.001) and with problem solving (r=-.34, p<.001). In addition, there was a statistically significant positive correlation between critical thinking disposition and problem solving (r=.69, p<.001). Conclusion: In order to improve critical thinking disposition and problem solving, we need to generate a lot of questions to the student’s inside. We also need to develop appropriate teaching methods so that this can be expressed by the actual question coming from the control hesitation factor of questions.
우정희(Chung-hee Woo),유재용(Jae Yong Yoo),박주영(Ju-young Park) 한국콘텐츠학회 2015 한국콘텐츠학회논문지 Vol.15 No.12
본 연구의 목적은 대학생의 학습자 생성 질문수준, 질문과정 및 질문저해요인 간 관계를 파악하기 위함이다. 연구 대상자는 2015년 9월 9일부터 10일까지 D시에 소재하는 일개대학의 대학생을 편의추출 하였으며, 174명을 대상으로 하였다. 자료는 SPSS WIN 21.0 프로그램을 이용하여 빈도, 백분율, 평균 및 표준편차, t-test, ANOVA, Correlation analysis를 분석하였다. 대상자는 개인의 다양한 수준들을 통하여 질문을 생성하게 되면서도 인지적 혼란을 통한 질문생성은 실제질문과 관련함을 알 수 있다. 또한 질문저해요인의 내적요인은 실제질문과 음의 상관관계를 보인다. 즉 대학생의 질문이 잘 표출되기 위해서는 학습자의 질문을 주저하는 외적요인 뿐만 아니라 내적요인을 감소하기 위하여 고민이 필요할 것이다. 또한, 인지적 혼란-질문생성-실제질문의 연계성을 인식하여 교수 개인 차원의 효율적인 교과목 운영이 이루어져야 할 것으로 생각된다. The purpose of this study was to identify the relations among questions level, questions process, and hesitation factor of questions. Data were collected from 174 students at a university in D city using structured questionnaire from September 9 to April 10 2015. It was analyzed with frequency analysis, descriptive statistics, t-test, ANOVA, and correlation analysis. As a result, the learners’ questions are made from cognitive confusion, these questions led the students to ask a question actually. Also, this study confirmed that the learners’ internal hesitation factors had negative correlation when the students asked a question in real situation. In order to improve the asking question we’ll need to be generating a lot of questions to the student’s inside and outside. We also need to develop appropriate teaching methods so that this can be perceived connection of cognitive confusion-having questions-asking questions.
A Study on Cooling Characteristics of the LED Lamp Heat Sink for Automobile by Forced Convection
Ho-Dong Yang(양호동),Jae-Young Yoo(유재용),Seul-Hyun Park(박설현) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.6
Automotive headlamps have been continuously developed as one of the most important devices for securing the driver’s view, and the LED lamps are getting popular in recent years. However, in case of the LED lamps, because the heat generated by the LED lamps are too high, it shorten the product life and lower the LED efficiency. Therefore, this study was investigated the cooling characteristics of the LED lamp heat sink for automobile by forced convection for LED heat generation control. In order to analyze the cooling characteristics of the heat sink, the temperature distribution results were investigated through the experiment and computational analysis under the increase of the air flow velocity, and the convective heat transfer coefficient was obtained. Also, convective heat transfer coefficient was calculated by the theoretical formula under the same condition and compared with experimental and computational results. From the result of this study, as the air flow velocity around the heat sink fins increased, the convective heat transfer coefficient significantly increased, confirming the improvement in the cooling effect.
스마트 수도미터를 이용한 수돗물 사용패턴 조사기법 연구
김효일(Hyo-Il Kim),유재용(Jae-Yong Yoo),강진호(Jin-Ho Kang),최영준(Young-June Choi) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
본 연구는 스마트 수도미터를 이용한 수돗물 사용패턴 조사기법을 수립하고, 계량기 불감율 산정, 적정 급수량 산정 등 다양한 분야에 조사 결과를 적용하기 위해 수행하였다. 연구 결과, 수돗물 사용량 분석을 위한 시간 분해능의 확보를 위하여 구경 15㎜ 기준으로 1개의 펄스 발신 당 통수량은 0.025L 이하, 저장주기는 5초 이하로 하는 것이 필요하다. 스마트계량기를 이용하여 15㎜ 수용가 100개소에 대해 수돗물 사용패턴 조사를 실시하여 유량범위 별 사용량 구성은 280~800 L/h에서 69.80%로 가장 높았고, 800L/h 이상도 20.44%로 높아서 전체 사용량의 약 90%가 비교적 큰 유속에서 사용되고 있음을 확인하였으며 높은 시간 분해능을 이용해 용도별 수돗물 사용량 분석 또한 가능함을 확인할 수 있었다.
공동주택에 발생되는 0.3mm미만 미세균열의 보수공법 적용을 위한 근거 마련 기초연구
박소영 ( Park So-young ),유재용 ( Yoo Jae-yong ),김수연 ( Kim Soo-yeon ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1
Cracks are typical defects that occur in concrete structures. When cracks occur in the structure, durability reduction, concrete neutralization, and steel corrosion cause functional safety problems. In order to prevent such cracks, surface repair method is performed for cracks smaller than 0.3 mm and rechargeable method is performed for cracks larger than 0.3 mm. However, even if it is applied by the surface repair method at less than 0.3 mm, re-leakage cracks continue to occur. Recently, the Supreme Court ruled that the rechargeable method should be applied to cracks less than 0.3mm in order to reduce the occurrence of defects. However, it was considered that the repair fees were too high relative to the observed defect rate, resulting in a necessitation of modifying the existing construction analysis administration standards. This study analyzes the differences in the subjective views on the durability degradation with regards to surface repair methods in concrete structures.