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모바일 기기의 청각 UI 착용성 향상을 위한 3 차원 귀 형상 기반 이어폰 설계
최영근(Younggeun Choi),정하영(Hayoung Jung),이원섭(Wonsup Lee),길혜진(Hyejin Kil),배진완(Jinwan Bae),유승훈(Seunghoon Ryu),서기열(Kiyeal Seo),이정훈(Junghoon Lee),유희천(Heecheon You) 한국HCI학회 2017 한국HCI학회 학술대회 Vol.2017 No.2
3 차원 귀 형상을 반영한 이어폰 설계는 착용감을 향상시킬 수 있다. 본 연구는 한국인 및 북미인 296 명의 3 차원 귀 형상을 측정하고 이들 특성을 분석하여 이어폰의 주요 부품 설계에 반영하였다. 개발된 이어폰 설계는 가상 착의 분석을 통해 90% 이상의 사용자들을 수용할 수 있을 것으로 추정된다. 본 연구의 3 차원 귀 형상 기반 설계 방법은 다양한 귀착용 제품 설계에 유용하게 활용될 수 있다.
OSA 공정의 세포 내 ATP, NAD(H), NADP(H) 농도
벤추라제이알 ( Jey R Sabado Ventura ),남지현 ( Ji Hyun Nam ),양빈친 ( Benqin Yang ),나리 ( Ri Na ),길혜진 ( Hyejin Kil ),남덕현 ( Deok Hyeon Nam ),강기훈 ( Ki Hoon Kang ),장덕진 ( Deokjin Jahng ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.6
In order to investigate why OSA (oxic-settling-anaerobic) process produces less sludge than CAS (conventional activated sludge) process, sequential cultivation through 1st aerobic-anaerobic-2nd aerobic conditions, were carried out. Then, the intracellular concentrations of adenosine triphosphate (ATP), nicotinamide adenine dinucleotide (NAD and NADH), and nicotinamide adenine dinucleotide phosphate (NADP and NADPH) were monitored for these three stages. Results showed that the concentrations of these energy substances rapidly decreased through time in both aerobic and anaerobic conditions but the anaerobic culture contained the lower energy level than aerobic culture. The 2nd aerobic culture that experienced anaerobic condition showed lower concentration of these energy substances than those of the 1st aerobic culture. Meanwhile, the anaerobic culture corresponding to the sludge holding stage of OSA was subjected to different soluble chemical oxygen demand (SCOD) levels, detention time, and temperature to evaluate the effects of these variations on the energy level difference between the 1st and 2nd aerobic stages. The lower the SCOD concentration, the longer detention time; and the higher temperature in the anaerobic stage tended to further reduce the intracellular level of the 2nd aerobic culture. On the average, the intracellular energy level of the anaerobic and 2nd aerobic stage were 57.73% and 39.12% of the 1st aerobic culture, respectively. These indicated that the insertion of an anaerobic stage between two aerobic stages could lower the intracellular energy levels, hence the lower the sludge in OSA than CAS process. Moreover, manipulation of the operating conditions of the intervening anaerobic stage can change intracellular energy levels thereby controlling sludge production.