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Ni계 촉매상에서 메탄에 의한 이산화탄소의 개질반응에 의한 수소제조 및 응용
문동주,강정식,류종우,김대현,유계상,이현주,김홍곤,이상득,안병성,이병권,Moon, Dong-Ju,Kang, Jung-Shik,Ryu, Jong-Woo,Kim, Dae-Hyun,Yoo, Kye-Sang,Lee, Hyun-Joo,Kim, Hong-Gon,Lee, Sang-Deuk,Ahn, Byoung-Sung,Lee, Byung-Gwon 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.2
Catalytic reforming of $CO_2$ by $CH_4$ over Ni-YSZ based catalysts was investigated to produce syngas as raw material of high valued chemicals and develop high performance catalyst electrode for an internal reforming of $CO_2$ in SOFC system. Ni-YSZ based catalysts were prepared using physical mixing and maleic acid methods to improve catalytic activity and inhibition of carbon deposition. The catalysts before and after the reaction were characterized by $N_2$ physisorption, TPR(temperature programed reduction), XRD and impedance analyzer. The conversions for $CO_2$ and $CH_4$ over Ni-MgO catalyst showed 90% but much amount of carbon deposition was detected on catalyst surface. On the other hand, the conversions for $CO_2$ and $CH_4$ over NiO-YSZ-$CeO_2$ catalyst showed 100% and 85% respectively, and carbon deposition on catalyst surface was inhibited under the tested condition. It was concluded that NiO-YSZ-$CeO_2$ catalyst is a promising candidate for the catalytic reforming of $CO_2$ and the internal reforming in SOFC system.
문동주,이성일,이종선,김경철,강희정,양용주,Moon, Dong-Ju,Lee, Sung-Il,Lee, Chong-Sun,Kim, Gyeong-Cheol,Kang, Hee-Jung,Yang, Yong-Ju 대한의용생체공학회 2008 의공학회지 Vol.29 No.5
A health index was proposed that evaluates personal health state from both measured physiological variables and survey questions. Four health indices were defined such as cardiovascular index, stress index, obesity index, and management index. The total health index was calculated by summing these four health indices. Physiological variables such as blood pressure, heart rate variability(HRV), accelerated photoplethysmograph(APG), and body fat percentage were non-invasively measured and a survey questionnaire that asks personal health state, exercise intensity, and food preference was developed. The suggested health index was applied to thirty eight persons including 30 patients and 8 normal persons with an average age of 51.8. The average health index was estimated to be 75.1 out of 100 points. Young age group(below 50) and men group showed higher health indices than the aged(over 50) and women groups. The correlation coefficient between the cardiovascular index and stress index was found to be 0.513, which means stress is related to cardiovascular health state. The correlation coefficient between the measurements and survey questions was 0.385 for the cardiovascular index. It was as low as 0.182 for the stress index. More case studies may improve correlations between measurements and survey questions, and then, the current health index system may develop as an effective tool to evaluate personal health state.
지각된 교사의 자율성 지지와 심리적 통제가 초등학생의 지능신념에 미치는 영향: 학업성취 수준에 따른 다집단 분석
문동주 ( Dongjoo Moon ),임효진 ( Hyo Jin Lim ) 한국초등교육학회 2022 초등교육연구 Vol.35 No.2
본 연구는 지각된 교사의 자율성 지지와 심리적 통제가 초등학생의 지능신념을 어떻게 예측하는지 알아보고, 학업성취 수준에 따라 이 관계가 어떻게 달라지는지 탐색하였다. 연구를 위해 초등학교 4, 5, 6학년 295명을 대상으로 자기보고식 설문을 통해 자료를 수집하였으며, 구조방정식 모형 및 다집단 분석을 실시하였다. 연구결과 첫째, 자율성 지지는 학생의 성장신념을 정적으로 유의하게 예측하였으나 고정신념을 유의하게 예측하지는 않았다. 둘째, 심리적 통제는 학생의 고정신념을 정적으로 유의하게 예측하였으나 성장신념을 유의하게 예측하지는 않았다. 셋째, 다집단 분석의 결과 저성취와 중성취, 저성취와 고성취 집단 간에 자율성 지지가 성장신념에 이르는 경로가 유의한 차이를 보이는 것으로 나타났다. 저성취 집단의 학생들은 교사의 자율성 지지를 높게 지각할수록 다른 성취 집단의 학생들보다 성장신념이 더 많이 높아졌고, 중성취 집단은 교사의 심리적 통제를 지각할수록 저성취 집단에 비해 성장신념이 더 많이 낮아졌다. 본 연구는 교사의 자율성 지지와 심리적 통제가 지능신념에 미치는 관계를 학생의 성취 수준에 따라 차별적으로 분석하였으며, 학생의 성장신념 형성을 위해 교사가 어떠한 환경을 제공해야 하는지를 규명하였다는 점에 의의가 있다. This study aimed to examine the relationships among teacher autonomy support, psychological control, and student beliefs about intelligence. It also investigated whether academic achievement level makes difference in the relationships. The data were collected through a self-report survey on targeted variables from elementary school students aged 10-12 years old (n=295). Multi-group Structural Equation Modeling (MG-SEM) was used to test the research hypotheses proposed in the study. Results showed that perceived autonomy support positively predicted student beliefs that intelligence is malleable (i.e. incremental theory), but did not predict beliefs that intelligence is fixed (i.e. entity theory). In addition, perceived psychological control positively predicted student entity theory but did not predict incremental theory. Lastly, in MG-SEM, the level of achievement made differences in the relationship. That is, low-achieving students had more incremental theory than mid- and high-achieving students when they perceived that their autonomy was supported. Also, mid-achieving students endorced less incremental theory than low-achieving students when they perceived psychological control in the classroom. The implication of the study was that cultivating a positive learning climate (teacher autonomy support) is a stronger predictor of developing adaptive beliefs about intelligence, especially for low achievers.
자동차 파워 트레인 샤프트 가공용 8축 복합가공기의 고 강성 구조설계에 관한 연구
문동주(Dong-Ju Moon),조준현(Jun-Hyun Cho),최윤서(Yun-Seo Choi),황인환(In-Hwan Hwang),이종찬(Jong-Chan Lee) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.2
The development of an exclusive 8-axis multi-tasking machine to finish multiple cutting processes by a single piece of power equipment for securing the high-precision machining and high productivity of the series of shafts (a core part of the automotive powertrain that delivers engine power) is needed. The rigidity of the structure must be improved and the weight of the structure must be reduced to develop a multi-tasking machine with high precision and high productivity. In this paper, we perform a static structural analysis of the initial design of the multi-tasking machines and compare the results of the multi-tasking machines improved by the reinforced design and the results of the initial one. According to the results of the structural analysis, the rigidity of the reinforced machine was increased and the overall weight was decreased. Therefore, the productivity was increased.