감성공학 기법을 활용한 공군 마크 개선

안진홍 대한인간공학회 2016 대한인간공학회 학술대회논문집 Vol.2016 No.11

초등학교 교사의 행복에 영향을 미치는 변인 분석 : 교사효능감, 집단효능감, 자아탄력성, 학교조직문화를 중심으로

안진홍,장수명 한국교원대학교 교육연구원 2019 敎員敎育 Vol.35 No.4

The purpose of this study was to investigate the structural relationships between individual factors(teacher efficacy, ego-resilience) and environmental factors(collective efficacy, school organizational culture), which affect the happiness of elementary school teachers. Data we recollected through electronic questionnaires from 349 teachers in 24 elementary schools located in Gwangju, Korea. The collected data were analyzed through a t-test, one-way ANOVA, multipleregression analysis, and structural equation modeling(SEM). The results found in this study are as follows: first, there was a significant difference in happiness according to two sociodemographic characteristics of elementary school teachers: length of teaching career and average monthly household income. Second, teacher efficacy and collective efficacy had no significant effect on the happiness of elementary school teachers and only ego-resilience and school organizational culture had a significant effect on happiness. Third, it was found that the collective efficacy of elementary school teachers has a significant mediated effect on happiness through both ego-resilience and school organizational culture. Collective efficacy also had a significant double-mediated effect on happiness sequentially through teacher efficacy and ego-resilience. This study has addressed the limitations of previous studies, which had partially validated the relationship between the variables. It is meaningful that the structural relationship of the variables affecting teachers’ happiness have been demonstrated in the integrative framework of the structural relationship between the sevariables in two dimensions of individual factors and environmental factors. 본 연구는 초등학교 교사의 행복에 영향을 미치는 변인을 개인요인으로 교사효능감과 자아탄력성을, 환경요인으로 집단효능감과 학교조직문화를 선정하여 이 변인들 간의 구조적 관계를 밝혔다. 광주광역시에 소재하는 초등학교 총 24교, 349명의 교사를 대상으로 전자설문을 통해 자료를수집하였으며, t-검정, 일원배치분산분석, 다중회귀분석, 구조방정식모형 분석을 시행하였다. 연구결과는 다음과 같다. 첫째, 초등학교 교사의 인구사회학적 특성 중에는 교직경력 및 월평균가구소득에 따른 행복의 평균값은 유의한 차이가 있으나 회귀분석 결과에서는 영향이 없었다. 둘째, 교사효능감과 집단효능감은 초등학교 교사의 행복에 유의한 영향을 주지 못하고, 자아탄력성과 학교조직문화만이 행복에 유의한 영향을 미치는 것으로 나타났다. 셋째, 집단효능감은 자아탄력성과 학교조직문화 각각을 거쳐 행복에 영향을 미치는 매개효과와, 집단효능감이 교사효능감과 자아탄력성을 순차적으로 거쳐 행복에 영향을 미치는 이중매개효과가 유의한 것으로 나타났다. 본 연구는기존연구들이 변인 간의 관계를 단편적으로 살펴보았다는 한계를 보완하여, 초등학교 교사의 행복에 영향을 미치는 변인들의 구조적 관계를 개인요인과 환경요인이라는 두 가지 차원의 종합적 틀안에서 검증했다는 점에서 의의가 있다. 본 연구결과를 바탕으로 논의 및 시사점을 제시하였다.

임계 오리피스를 통과한 입자의 운동 특성에 관한 수치적 연구 ( Numerical Study of Particle Motion Through a Critical Orifice )

안진홍,안강호 대한기계학회 1998 대한기계학회 춘추학술대회 Vol.- No.-

순환골재 추출입도 품질관리를 통한 순환 아스팔트 혼합물 성능향상 연구

안진홍,백종은,함상민,황성도,김영민 한국도로학회 2021 한국도로학회논문집 Vol.23 No.6

PURPOSES : The purpose of this study is to identify a gradation control method that minimizes the volatility of recycled aggregates to maintain the quality of reclaimed asphalt mixtures. METHODS : In this study, two types (0~13 and 0~10 mm) of recycled aggregate stockpiles with an extraction viscosity of 40,000 poise and a 19 mm hot asphalt mixture with virgin aggregates are used. The test methods are evaluated for plastic deformation resistance using the Hamburg wheel-tracking test and for low-temperature crack resistance using the dynamic modulus test. In the field, the performance is evaluated via an accelerated pavement test. RESULTS : The Hamburg wheel-tracking test shows good water resistance as well as less than 5 mm of deformation. The result of a dynamic modulus test at -5 °C shows a 92.9% low-temperature crack resistance as compared with that of the 19 mm dense grade hot-mix asphalt mixture. The result of the accelerated pavement test confirms that the performances of the 19 mm dense grade hot-mix asphalt mixture and reclaimed asphalt mixture are equal owing a 1.2 cm plastic deformation. CONCLUSIONS : By evaluating the plastic deformation resistance and crack resistance of the reclaimed asphalt mixture based on a stockpile gradation controlled at 0~10 mm via an indoor test, it is discovered that the plastic deformation resistance increases partially, whereas the crack resistance remains almost unchanged. The accelerated pavement test confirms that a performance equivalent to that of a 19 mm dense grade hot-mix asphalt mixture is achieved.

임계 오리피스를 통과한 입자의 운동특성과 입자 빔에 관한 수치적 연구

안진홍,안강호,Ahn, Jin-Hong,Ahn, Kang-Ho 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.10

Particle motion through a disk type critical orifice placed in a 3.0cm diameter chamber has been studied numerically. In the simulation, the velocity field is solved using Pantankar's SIMPLER algorithm for the compressible flow and convergence of the computation is confirmed if the mass source at each control volume is smaller than $10^{-7}$. The particle motion in the flow field is solved in Lagrangian method. The particle trajectories showed that the particles injected away from the center line are expanded rapidly. At lower pressures, this expansion phenomena are more dominant. At lower pressures, the clear difference in particle and air speed is showed all the way down to the exit plan. It was found that particles with Stokes number of ca.2.5 tend to focus close to the center line very well except the particles travelling near the wall. However, particles with Stokes number greater than ca.2.5 show a tendency to cross the center line.

순환골재 추출입도 품질관리를 통한 순환 아스팔트 혼합물 성능향상 연구

안진홍,백종은,함상민,황성도,김영민 한국도로학회 2021 도로 : 도로학회지 Vol.23 No.3

PURPOSES : The purpose of this study is to identify a gradation control method that minimizes the volatility of recycled aggregates to maintain the quality of reclaimed asphalt mixtures. METHODS : In this study, two types (0~13 and 0~10 mm) of recycled aggregate stockpiles with an extraction viscosity of 40,000 poise and a 19 mm hot asphalt mixture with virgin aggregates are used. The test methods are evaluated for plastic deformation resistance using the Hamburg wheel-tracking test and for low-temperature crack resistance using the dynamic modulus test. In the field, the performance is evaluated via an accelerated pavement test. RESULTS : The Hamburg wheel-tracking test shows good water resistance as well as less than 5 mm of deformation. The result of a dynamic modulus test at -5 °C shows a 92.9% low-temperature crack resistance as compared with that of the 19 mm dense grade hot-mix asphalt mixture. The result of the accelerated pavement test confirms that the performances of the 19 mm dense grade hot-mix asphalt mixture and reclaimed asphalt mixture are equal owing a 1.2 cm plastic deformation. CONCLUSIONS : By evaluating the plastic deformation resistance and crack resistance of the reclaimed asphalt mixture based on a stockpile gradation controlled at 0~10 mm via an indoor test, it is discovered that the plastic deformation resistance increases partially, whereas the crack resistance remains almost unchanged. The accelerated pavement test confirms that a performance equivalent to that of a 19 mm dense grade hot-mix asphalt mixture is achieved.

Open Box형 강재빔을 이용한 중앙분리대 형식의 개발

안진홍,박창민,최진성,김기환,최현호 한국도로학회 2009 한국도로학회 학술대회 발표논문 초록집 Vol.2009 No.11

제주도 내 회전교차로의 초기공사비 예측모델 개발

안진홍,이동욱,An, Jin-Hong,Lee, Dong Wook 대한토목학회 2014 대한토목학회논문집 Vol.34 No.4

최근 들어 교통사고 예방 및 교통지체 해소는 물론 도로이용자 교통편의를 제공하는 목적으로 회전교차로 설치공사가 많이 발주되고 있다. 그러나 회전교차로 공사에 대한 개략적인 공사비를 예측하는 기준이나 단가가 정립되어 있지 않을 뿐만 아니라, 회전교차로 공사 초기 단계에서의 공사비 예측에 관한 체계적인 연구가 미흡한 실정이다. 본 연구에서는 현재 제주도내에 설치된 회전교차로를 중심으로 공사현장의 여건을 고려한 공사 초기단계에서 회전교차로공사 개략공사비 산정 모델을 제시하고자 하였다. 본 연구에서는 제주도내 25개 회전교차로공사의 설계자료를 바탕으로 회귀분석을 통해 개략공사비 회귀방정식을 도출하였으며, 매우 예측의 정확도가 높은 것으로 분석되었다. 도출된 회귀방정식에 대해서 검증한 결과 회귀방정식을 통한 추정금액과 설계금액과의 오차율이 2.3%, 3.7%, 5.8%의 차이를 보임으로써 매우 예측의 정확도가 높은 것으로 분석되었다. Recently, there are many roundabouts installation works which are ordered to provide convenient transportation to road users as well as to eliminate traffic accidents and traffic delays. This study propose an approximate construction cost estimation model for early stages of roundabout construction. The model is designed considering the conditions of the early stage roundabout construction sites in Jeju. The regression equation of approximate construction cost was derived through regression analysis of 25 design data of roundabout construction in Jeju, and it was analyzed to have a high prediction accuracy. Finally, results verifies high prediction accuracy of the derived regression equation. Difference between the estimation cost and the design cost was only 2.3%, 3.7%, and 5.8% that verifies the high accuracy of the proposed approximate construction cost estimation model.

소형위성 SAR 설계 기술

안진홍,정해원,김두환,김재현 대한전자공학회 2015 전자공학회지 Vol.42 No.4

박층 고형화 에폭시 아스팔트 포장의 국내 강상판 적용성 평가

안진홍,홍상일,배종오,김기헌,박태순 한국도로학회 2012 한국도로학회 학술대회 발표논문 초록집 Vol.2012 No.09