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유다연(Dayeon Yu),이천성(Cheonseong Lee),김성곤(Songgon Kim),이병화(Byounghwa Lee),송주헌(Juhun Song),장영준(Youngjune Chang),이시훈(Sihyun Lee),전충환(Chunghwan Jeon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In order to investigate devolatilization characteristics for ashless coal with relatively low ash content and high heating value, an experiment was performed in different bed configurations of TGA and DTF(Drop Tube Furnace) at atmospheric pressure condition. The heating rate was 10℃/min up to 950℃ in TGA, while temperatures varied from 500 to 1300℃ in DTF. A weight loss and particle temperature were obtained to be used for kinetic analysis of the devolatilization. The kinetic parameters including an activation energy and pre-exponential factor for ashless coal were obtained using Coats-Redfern method in TGA and single step method in DTF. Furthermore, the devolatilization kinetics of the ashless coal were compared with the results of different kinds of conventional coal such as sub-bituminous and bituminous.
유다연(Da Yeon Yu),이병화(Byoung Hwa Lee),송주헌(Ju Hun Song),이시훈(Si Hyun Lee),전충환(Chung Hwan Jeon) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.10
본 연구는 낮은 회 성분의 함량과 높은 발열량의 특성을 지닌 초청정 석탄의 탈휘발 반응율 특성을 연구하였다. 정적 상태에서의 탈휘발 반응율 특성을 얻기 위하여 TGA 장치를 10 /min으로 950 까지 승온시키며 Coats-Redfern 방법을 사용하여 결과를 도출하였고, 동적 상태에서는 DTF(Drop Tube Furnace) 반응로 온도를 각각 500℃, 700℃, 900℃, 1100℃, 1300℃로 변화시켜서 실험을 수행하였으며 single step 방법을 통해 탈휘발 반응율 특성을 얻었다. 본 연구를 통해 도출한 초청정 석탄의 탈휘발 반응율 특성은 기존에 사용되어온 Wira(아역청탄)과 Yakurugol(역청탄)의 탈휘발 특성과 비교하였으며, 정적? 동적 상태에서 초청정 석탄의 활성화 에너지가 다른 탄종들에 비해 작게 나타났다. In order to investigate devolatilization characteristics for ashless coal with relatively low ash content and high heating value, an experiment was performed in different bed configurations of TGA and DTF(Drop Tube Furnace) at atmospheric pressure condition. The heating rate was 10℃/min up to 950℃ in TGA, while the temperatures of DTF varied from 500 to 1300℃ in step of 200℃. A weight loss and particle temperature were obtained to determine devolatilization kinetics. The kinetic parameters including an activation energy and pre-exponential factor for ashless coal were obtained using Coats-Redfern method in TGA and single step method in DTF. Furthermore, the devolatilization kinetics of the ashless coal were compared with the results of different kinds of conventional coal such as sub-bituminous and bituminous. The results show that the activation energy of devolatilazation for ashless coal is lower than those of others in fixed and entrained conditions.
베이비부머 여가문화시설 사용자 요구 분석 - 전라북도 군산시를 중심으로 -
유다연(Yu, Da-Yeon),한오영(Han, O-Yeong),오명원(Oh, Myoung-Won),유성은(Yoo, Sung-Eun) 한국실내디자인학회 2024 한국실내디자인학회 학술대회논문집 Vol.26 No.1
This study explores the user-centered requirements for leisure and cultural facilities among the Baby Boomer generation, aged 50 to 70, residing in a rural city. Employing the Focus Group Interview method, participants were recruited from leisure and cultural facility users in Gunsan City, Jeollabuk-do Province, South Korea. Through a series of workshops, the study investigated the current status, challenges, and potential improvements of local leisure and cultural facilities. Key findings revealed inadequacies in facility environments, management, and program diversity compared to urban areas, along with transportation inconveniences for long-distance users. To address these issues, the study suggests providing convenient transportation options, developing tailored facilities and programs, and creating spaces for intergenerational interaction to promote tradition transmission and talent cultivation. Future research should focus on conducting specific demand surveys to formulate concrete improvement strategies for leisure and cultural facilities catering to the older population in rural areas.
김이조(Li-Jo Kim),유다연(Da-Yeon Yu),권차욱(Cha-Uk Kwon),곽지민(Ji-Min Kak),백화현(Hwa-hyun Baek),차경애(Kyung-Ae Cha) 한국멀티미디어학회 2009 한국멀티미디어학회 학술발표논문집 Vol.2009 No.2
데이터 글러브(Data Glove)는 손 제스처를 정의하여 시스템을 제어하는 입력장치로 가상현실시스템 및 의료분야에 많이 사용되며, 이는 가상현실 속에 존재하는 사물을 제어하게 함으로써 사용자에게 마치 현실 세계의 사물을 제어하는 느낌을 주게 한다. 이에 본 논문에서는 이러한 데이터 글러브를 3차원 게임에 적용시키는 새로운 방법을 제안한다. 실험을 위해 데이터 글러브로 제스춰를 정의하고, OpenGL로 인형 뽑기 게임을 구현하여 사용자가 데이터 글러브로 게임을 제어하도록 한다. 본 논문에서 제안한 방법은 사용자들에게 좀 더 높은 몰입감을 제공하며, 게임 산업 발전에도 많은 영향을 줄 것으로 기대한다.