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바이오가스 수증기 개질 반응용 Ni 촉매 성능 연구: 지지체 및 침전제 주입 속도에 따른 영향
공지현,김민주,전경원,장원준,Ji-Hyeon Gong,Min-Ju Kim,Kyung-Won Jeon,Won-Jun Jang 한국청정기술학회 2023 청정기술 Vol.29 No.4
본 연구에서는 바이오가스 수증기 개질을 통한 합성가스 생산에 관해 연구했다. Ni-Al<sub>2</sub>O<sub>3</sub> 및 Ni-CeO<sub>2</sub> 촉매는 공침법으로 제조되었으며 침전제 주입 속도가 조절되었다. 온도에 따른 촉매 성능 테스트는 CH<sub>4</sub>:CO<sub>2</sub>:H<sub>2</sub>O = 1:0.67:3의 가스 조성비와 647,000 mL h<sup>-1</sup> gcat<sup>-1</sup>의 공간속도에서 진행하였다. 침전제 주입 속도는 촉매 특성에 영향을 미쳤으며, 지지체 종류에 따라 결과를 보였다. 온도가 증가함에 따라 이산화탄소 개질 반응과 reverse water gas shift 반응이 일어났다. 수증기가 충분히 공급되는 조건에서는 침전제를 한 번에 투입하여 제조된 Ni-Al<sub>2</sub>O<sub>3</sub> 촉매가 높은 Ni 분산도에 기인하여 가장 우수한 성능을 보였다. This study investigated synthesis gas production via steam reforming of biogas. Ni-Al<sub>2</sub>O<sub>3</sub> and Ni-CeO<sub>2</sub> catalysts were synthesized using the co-precipitation method, with controlled precipitation agent injection rates. Catalytic performances were tested at various temperatures, with a gas composition ratio of CH<sub>4</sub>:CO<sub>2</sub>:H<sub>2</sub>O = 1:0.67:3 and a gas hourly space velocity (GHSV) of 647,000 mL h<sup>-1</sup> gcat<sup>-1</sup>. The rate of precipitation agent injection influenced the characteristics of the catalysts depending on the type of support used. As the temperature increased, both the CO<sub>2</sub> reforming of methane and the reverse water gas shift reactions occurred. The Ni-Al<sub>2</sub>O<sub>3</sub> catalyst, synthesized with a single injection of the precipitation agent, exhibited the best catalytic activity under conditions with sufficient steam supply among the prepared catalysts, due to its high Ni dispersion.
공지현 명지대학교 중동문제연구소 2015 중동문제연구 Vol.14 No.1
This comparative study focuses on the cultural characteristics of the body part vocabulary idioms and aims to investigate which meanings the body part vocabularies 「‘eye’, ‘’」 and 「‘face’, ‘’」 respectively, in Korean and Arabic idioms are related to. It found out that first, the two languages have diverse and abundant idioms using the body part vocabularies and the meanings of these idioms could be represented largely in the two classes, namely, the idioms representing ideas and thoughts and the idioms expressing emotions and psychological attitudes. Second, the two languages have a large quantity of body part vocabulary idioms originating from common ideas or thoughts. Third, there are some language-specific idioms using the body part vocabularies in the two languages so that there are no corresponding concepts and emotions among each other.
아랍어 학습동기의 최근 연구동향 분석 - 2013년부터 2022년까지 국내외 학술지 논문을 대상으로
공지현,김보영,백혜원 한국아랍어아랍문학회 2023 아랍어와 아랍문학 Vol.27 No.3
본 연구는 아랍어 학습동기 연구의 최신 동향을 분석하는 것을 목표로 한다. 이러한 목표를 달성하기 위해 2013년부터 2022년까지 국내외 학술지에 게재된 아랍어 학습동기 관련 연구논문 총 75편을 검토하였다. 자료는 출판연도, 동기이론, 연구방법, 연구지역, 주요주제 등 5가지 기준으로 분류하였다. 연구 결과, 연구 기간 동안 아랍어 동기연구의 수가 크게 증가했으며 자기결정성이론이 가장 많이 사용된 것으로 나타났다. 또한, 여전히 정량적 방법이 가장 많이 사용되고 있으나, 정성적 방법과 혼합적 방법의 사용이 증가하고 있으며, 주로 다루어지는 연구주제는 지역 별 환경이나 경험 등에 따라 차이가 있음을 알 수 있었다. 본 연구의 결과를 바탕으로 향후 아랍어 동기연구를 개선할 수 있는 일부 방안을 제안하였다. This study aims to identify the latest trends in Arabic motivation research. A total of 75 research articles in Arabic, English and Korean on Arabic learning motivation published in domestic and foreign academic journals from 2013 to 2022 were reviewed. The data were categorized into five criteria: publication year, motivation theory, research method, research region, and main theme. The study revealed that the number of Arabic motivation research increased significantly during the study period and that self-determination theory was used the most. In addition, it found out that quantitative methods are still the most used, but the use of qualitative and mixed methods was increasing, and that the main research themes showed differences depending on local conditions or experiences or etc. Based on the results, some suggestions were provided to improve the Arabic motivation research.
공지현 부산외국어대학교 지중해연구소 2002 지중해지역연구 Vol.4 No.2
This research aims to analyze the cultural contents of four Arabic teaching textbooks used currently in Korea. To attain this object, this research uses three ways. Firstly, the cultural contents were classified into 'small c culture' and 'big C culture' and checked whether they are distributed in balance. Secondly, the four textbooks were analyzed generally in terms of teaching culture with check lists. Thirdly, it was examined how much these four textbooks satisfy learners' interests. As a result, the followings are found out. First, all of the four textbooks don't present cultural information by using footnotes or side notes. Second, all of these textbooks don't give enough contrast between target culture and students' native culture. Except for 'Al-Kita ̄b fl' Ta??allum Al-??Arabiyyah', the three textbooks under analysis don't introduce cultural contents in balance.
국내 대학생 아랍어 학습자의 학습동기와 학습노력에 관한 연구 - 제2언어 동기 자아, 국제적인 자세, 경쟁 변인을 중심으로
공지현 한국외국어대학교(글로벌캠퍼스) 중동연구소 2023 중동연구 Vol.41 No.3
Motivation plays an important role in the second language learning. The present study aimed to investigate the effects of Arabic learners' motivation on their learning efforts, using Dörnyei's (2005; 2009) 'L2 Motivational Self System'. In particular, the study made an attempt to find out characteristics of Korean Arabic learners' motivation at the college level by observing two motivational variables, international posture and competitiveness, which were assumed to be influenced by Korean socio-educational environment. To this end, this study surveyed 150 Korean students studying Arabic at 5 Korean universities and revealed that ideal L2 self and competitiveness play an important role in strengthening the learning efforts of Korean Arabic learners, whereas ought-to L2 self and international posture do not. The study provided pedagogical implications based on these key findings.