이산화탄소의 메탄화반응에서 Ni-Fe-Ru-Al₂O₃ 촉매의 Ru 금속이 메탄 생성에 미치는 영향

황선환,백준현,고동준,임효준,송인규 한국공업화학회 2012 한국공업화학회 연구논문 초록집 Vol.2012 No.1

국민여가활성화를 위한 여가교육정책 제안

황선환,김매이,박수정 여가문화학회 2017 여가학연구 Vol.15 No.3

The purpose of the current study was to suggest policies for leisure education in order to activate leisure activities. The study focused leisure education section which is an important area to establish the basic plan for leisure activation after establishment of the national leisure activation basic law in May 2015. Doing this, we tried to know the role of leisure in order to improve people’s happiness. To achieve the goal, we collected the data from previous research and investigated the present state of leisure education, and analyzed education contents. Thus leisure education policies which are appropriate for Korean society were suggested: First, development of the continuing leisure education units, second, leisure education donation through linking culture, arts, and sports major, third, development of leisure-related education program contents for teachers, finally, development of the leisure safety manual. 본 연구는 국민들의 행복감에 직결되는 중요한 요인인 여가선용을 활성화시키기위해 여가교육이라는 영역에 초점을 맞추어 정책을 제안하는데 그 목적이 있다. 이는 지난 2015년 5월 ‘국민여가활성화 기본법’이 제정된 이후 국민여가활성화기본계획을 수립하는데 있어 중요한 분야인 ‘여가교육’을 중심으로 국민의 행복을 증진시키기 위한 여가의 역할은 무엇인가를 알아보고자 하였다. 이를 위해본 연구에서는 선행연구를 통해 자료를 수집하였고, 이를 중심으로 여가교육에대한 현황 파악 및 교육 콘텐츠를 분석하였으며, 한국사회에 적합한 여가교육 정책을 제안하였다. 연구 결과는 다음과 같다. 첫째, 여가평생교육단위 개발, 둘째, 문화예술체육 전공 연계봉사를 통한 여가교육기부, 셋째, 교사들을 위한 여가관련교육 프로그램 콘텐츠 개발, 넷째, 여가안전 매뉴얼 개발 등이다.

우리 생활 속 UPS와 ESS 이야기

황선환,김동현(그림) 전력전자학회 2016 전력전자학회지 Vol.21 No.5

진지한 여가가 주관적 삶의 질에 미치는 영향: 여가만족의 매개효과(mediation effect) 검증

황선환,김미량,이연주 여가문화학회 2011 여가학연구 Vol.9 No.2

The purpose of this study was to investigate the mediation effect of leisure satisfaction on the relationship between serious leisure and perceived quality of life. In order to conduct this study, first, authors set the research model among serious leisure, leisure satisfaction, and the quality of life through reviewing the literature. To examine the research model, a total of 513 respondents over 20 years old participated in this study. Confirmatory factor analysis, reliability analysis, correlation analysis, and structural equation method were utilized using SPSS 18.0 and AMOS 7.0 program. Before examining the research model, the reliability and validity of the questionnaire were tested. One of the life-quality factors was excluded by correlation analysis and confirmatory factor analysis and the research model was modified without one factor of the quality of life. The results of the final research model examination indicated that serious leisure had the direct and indirect positive effects on the quality of life, and leisure satisfaction had a partial(complementary) mediation effect on the relationship between serious leisure and the quality of life. Therefore, the current study depicted that participation in serious leisure was an important factor to increase the perceived quality of life through the mediation effect of leisure satisfaction. 이 연구는 현대인들의 바람직한 여가참여 유형인 진지한 여가의 참여정도에 따른 주관적 삶의 질에 미치는 영향관계에서 여가만족의 매개효과를 검증하기 위해 수행되었다. 연구수행을 위해 먼저 문헌조사를 통해 진지한 여가와 그에 따른 궁극적인 이득으로 판단되는 여가만족 및 삶의 질의 관계에 대한 연구모형을 설정하였다. 연구모형은 진지한 여가가 여가만족에, 그리고 여가만족은 삶의 질에 긍정적인 영향을 미치는 변인이며 따라서 진지한 여가가 삶의 질에 영향을 미치는데 여가만족이 매개변수로 작용할 것이라는 매개모형을 설정하였다. 연구모형의 검증을 위해 총 513명의 만 20세 이상 성인을 대상으로 설문조사하여 도출된 자료를 분석에 이용하였다. SPSS 18.0과 AMOS 7.0으로 확인적 요인분석, 신뢰도분석, 상관관계분석 그리고 구조방정식 모델검증을 적용하였다. 모형검증 이전에 확인적 요인분석, 신뢰도분석 그리고 상관분석을 통해 설문지의 타당도와 신뢰도를 검증하였다. 연구결과, 먼저 사전에 설정한 연구모형의 구조모형분석 결과와 상관분석 그리고 확인적요인분석의 결과를 통해 삶의 질에서 한 가지 요인을 삭제하고 모형을 수정하였다. 최종적으로 수정된 모형을 분석한 결과 진지한 여가는 삶의 질에 직․간접적으로 정적영향을 주고 있었는데 여가만족이 부분매개효과 즉, 보완적 매개효과를 갖고 있는 것으로 나타났다. 본 연구의 결과는 높은 수준의 진지한 여가활동 경험은 여가만족에 영향을 주고 그 영향력이 삶의 질에 영향을 주는 경로를 설명해주는 것으로 진지한 여가는 여가만족의 매개효과를 통해 삶의 질 향상을 촉진할 수 있는 중요한 변인임을 제시하고 있다.

Methanation of carbon dioxide over mesoporous Ni–Fe–Al2O3catalysts prepared by a coprecipitation method: Effect of precipitation agent

황선환,송인규,홍웅기,이중원,서정길,백준현,고동준,임효준 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6

Mesoporous nickel (30 wt%)–iron (5 wt%)–alumina (denoted as NiFeAl–X) catalysts were prepared by a coprecipitation method with a variation of precipitation agent (X = (NH4)2CO3, Na2CO3, NH4OH, and NaOH), and they were applied to the methane production from CO2 and H2. Metal particle size of reduced NiFeAl–X catalysts decreased in the order of NiFeAl–NaOH > NiFeAl–NH4OH > NiFeAl–Na2CO3 > NiFeAl–(NH4)2CO3. In the methanation of CO2, yield for CH4 increased in the order of NiFeAl–NaOH < NiFeAl–NH4OH < NiFeAl–Na2CO3 < NiFeAl–(NH4)2CO3. This indicates that the catalytic performance in the methanation of CO2 was strongly influenced by the identity of precipitation agent.

Methanation of carbon dioxide over mesoporous Ni–Fe–Ru–Al2O3 xerogel catalysts: Effect of ruthenium content

황선환,송인규,이중원,홍웅기,백준현,고동준,임효준 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2

Mesoporous nickel (35 wt%)–iron (5 wt%)–ruthenium (x wt%)–alumina xerogel (denoted as 35Ni5Fex-RuAX) catalysts with different ruthenium contents (x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) were prepared by a single-step sol–gel method for use in the methane production from CO2 and H2. Conversion of CO2, yield for CH4, metal surface area, and the amount of desorbed carbon dioxide of the catalysts showed volcanoshaped trends with respect to ruthenium content. Experimental results revealed that metal surface area and the amount of desorbed carbon dioxide of 35Ni5FexRu catalysts were well correlated with conversion of CO2 and yield for CH4.

졸-겔법으로 Pt/Ti/SiO₂/Si 기판위에 제작된 (Bi,La)Ti₃O₁₂ 강유전체 박막의 특성 연구

황선환,장호정,Hwang, Sun-Hwan,Chang, Ho-Jung 한국재료학회 2002 한국재료학회지 Vol.12 No.11

Metal-Ferroelectric-Metal(MFM) capacitors were prepared using $Bi_{3.3}$ $La_{0.7}$ $Ti_3$$O_{12}$ (BLT) ferroelectric thin films which were spin coated on $Pt/Ti/SiO_2$/Si substrates by the Sol-Gel method. BLT thin films annealed at above $650^{\circ}C$ showed polycrystalline structures with typical c-axis preferred orientation. The grain size and surface roughness were increased as the annealing temperature increased from $650^{\circ}C$ to $700^{\circ}C$. In addition, the full width at half maximum (FWHM) values were decreased with increasing annealing temperatures, indicating the improvement of crystallinity. The remanent polarization (2Pr= $Pr^{+}$ $+Pr^{-) }$ and leakage current of the BLT film annealed at $650^{\circ}C$ were about 29.3 $\mu$C/cm$^2$ and $2.3$\times$10^{-8}$$ A/cm^2$ at 3V. There were no distinct changes in the retention charges after $10^{10}$ polarization switching cycles, showing good fatigue property of the annealed BLT films.

모바일 스포츠앱 정보습득동기와 지속이용의도의 관계: 판타지스포츠게임 몰입의 조절효과

황선환,이유진 한국체육학회 2023 한국체육학회지 Vol.62 No.6

The intention to continue is expected to be positively related to the commitment to various variables along with the motivation for information seeking, and it is necessary to pay attention to the specific role of commitment to fantasy sports games. In this way, it is needed to examine the role of the user’s commitment to fantasy sports games in the relationship between the motivation for information seeking and the intention to continue using it. The purpose of the study was to explore the environment where optimal mobile content can be experienced in the mobile market of digital civilization. A total of 450 samples were collected through an online survey, of which 410 were used for the final analysis, excluding 40 insincere survey responses. Frequency analysis, descriptive statistical analysis, confirmatory factor analysis, reliability analysis, correlation analysis, process macro 3.4 ver. Model 1 were performed using SPSS 27.0 and AMOS 27.0 version. Both the motivation of seeking information for the use of mobile sports apps and commitment to fantasy sports games have positive effects on the intention to continue. In addition, in the relationship between motivation for information seeking and intention to continue, commitment to fantasy sports games have a moderating effect. Therefore, an environment where optimal mobile content can be experienced is formed when the degree of involvement of individual’s fantasy app and the desire for information acquisition are mutually satisfied, and as a result, satisfaction with the use of the app and continuous use intention increase.

Coordinated Control of an Independent Multi-phase Permanent Magnet-type Transverse Flux Linear Machine Based on Magnetic Levitation

황선환,권순걸,황영기,방덕제 한국조명.전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.12

This paper proposes a coordinated control for an independent multi-phase transverse flux linear synchronous motor (IM-TFLSM) based on magnetic levitation. The stator structures of the IM-TFLSM are composed of a two set, which has independent three-phase windings and a double-sided air-gap as opposed to the conventional Y-connected three-phase linear motors. A suitable control algorithm is necessary to operate the applied linear machine. This study proposes a coordinated control algorithm for adjusting the mover air-gap and thrust force of the IM-TFLSM in order to maintain air-gap and phase shifted current control of the independent 3-phase modules. In addition, the principle of operation and its special structures are described in detail and the validity and effectiveness of the control algorithm is verified through multiple experimental results.

Compensation of Position Error due to Amplitude Imbalance in Resolver Signals

황선환,권영화,오진석,김장목 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.5

This paper presents a compensation algorithm for position error due to an amplitude imbalance between resolver output signals. Resolvers are typically used to obtain absolute position information for motor drive systems in severe environments. Position error is caused by an amplitude imbalance of the resolver output signals. As a result, the d- and q-axis currents of synchronous reference frame have periodic ripples in the stator fundamental frequency in permanent magnet synchronous motor (PMSM) drive systems. Therefore, this paper proposes a compensation algorithm to reduce the position error generated by the amplitude imbalance. The proposed method does not require any additional hardware, and reduces computation time with a simple integral operation according to rotor position. In addition, the position error can be directly compensated for by the estimated position error. The effectiveness of the proposed compensation algorithm is verified through several simulations and experiments.