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생체 신호 측정을 위한 섬유전극의 형태에 따른 전기적 특성 분석 및 비교
이영재(Youngjae Lee),이강휘(Kanghwi Lee),이정환(JeongWhan Lee),강다혜(Dahye Kang),조하경(Hakyung Cho),조현승(Hyunseung Cho),이주현(Joohyeon Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
Many kinds of electrodes have been developed in various forms and shapes for measurement of bio potential signal. Textile electrode has benefit of collect long term data monitoring because of it is non consciousness, convenient and do not occur skin irritation. However, It is very difficult to acquire available data due to high impedance of electrode and unstable skin-electrode contact which generate motion artifact. Also snap button which usually used as mediator between textile and measurement device cause change of electrical characteristics. In this paper, we inflated textile electrode to stabilize contact and add conductive silver paste between textile and snap button to improve conductance. To compare the performance of two methods, flat or inflated and add conductive paste or not, four types of electrodes are tested on each impedance and SNR by ECG measurement. In result, the first type electrode which flat and non-conductive paste showed the worst performance and the last type electrode which is inflated shape and contain conductive paste show the best performance.
이영재(Lee, Youngjae) 한국생활과학회 2016 한국생활과학회지 Vol.25 No.6
This study was aimed to draw objective results for the images of Korean wave actresses, using statistical methods. Four Korean wave actresses, Young-ae Lee, Jee-hyun Jun, Hae-Gyo Song, and Jee-woo Choi, were selected by surveying foreign students studying in Korean universities. The survey aimed to list ‘adjectives’ associating their image cuts by the free association method. A total of 26 adjective pairs were finally selected, for which the cluster analysis of Ward’s method were performed. Also, for comparative analysis of their images, factorial analysis using the principal component analysis and varimax rotation was performed. One-way analysis of variance and Scheffe’s method for the adjective pairs was done by using factor scores obtained from this study. We observed that Korean wave actresses have their own images, and the results of this study are summarized as follow: The comparativeness analysis shows that Young-ae Lee is superior in the dignity factor, but low in fashion as a factor. Jee-hyun Jun is remarkable in attractiveness and fashion, and has the highest fashioning factor score. Jee-woo Choi is equal for attractiveness, fashioning, and activeness, and is most ‘feminine’ in fashioning. Hae-Gyo Song is quite different from other actresses, and is considered ‘pretty’ in the attractiveness factor, and ‘sportive’ in the fashion factor. We suggest that Korean export companies should apply these results to fashion products for countries where trade is thriving with the Korean wave boom. We expect that the sales would be considerably increased.
RF/DC 스퍼터 성장한 ITO/Ag/ITO 투명전극 박막의 특성 연구
이영재(Youngjae Lee),김제하(Jeha Kim) 한국태양광발전학회 2022 Current Photovoltaic Research Vol.10 No.1
We investigated the optical and electrical characteristics of ITO/Ag/ITO (IAI) 3-layer thin films prepared by using RF/DC sputtering. To measure the thickness of all thin film samples, we used scanning electron microscopy. As a function of Ag thickness we characterized the optical transmittance and sheet resistance of the IAI samples by using UV-Visible spectroscopy and Hall measurement system, respectively. While the thickness of both ITO thin films in the 3-layered IAI samples were fixed at 50 nm, we varied Ag layer thickness in the range of 0 nm to 11 nm. The optical transmittance and sheet resistance of the 3-layered IAI thin films were found to vary strongly with the thickness of Ag film in the ITO (50 nm)/Ag(t0)/ITO (50 nm) thin film. For the best transparent conducting oxide (TCO) electrode, we obtained a 3-layered ITO (50 nm)/Ag (t0 = 8.5 nm)/ITO (50 nm) that showed an avrage optical transmittance, AVT = 90.12% in the visible light region of 380 nm to 780 nm and the sheet resistance, R□=7.24 Ω/□.
뿌조 607 HDI 경유승용차의 매연여과장치 재생특성분석
이영재(Youngjae Lee),김강출(Gangchul Kim),표영덕(Youngdog Pyo),정요일(Youngil Jeong) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel engines have advantages of not only durability and robustness but also lower fuel consumption and carbon dioxide emission compared to gasoline engines. However, diesel engines emit higher particulate matters(PM) and NOx, which is fatal disadvantage. In order to cope with PM emission, PSA Peugeot Citroen introduced the DPF equipped diesel passenger car, 607 HDI Sedan, in May 2000 at the ve교 first in the world. This DPF system is an active and passive combination type operated with a SiC filter, an oxidation catalyst, Cerium-Based Fuel-Borne Catalyst, and post injection technology. In the present study, the regeneration characteristics of DPF in Peugeot 607 HDI was examined on the chassis dynamometer and on-road driving test. Various parameters such as vehicle speed, engine rpm, exhaust gas temperature upstream DPF and differential pressure between DPF were measured, and fuel economy and exhaust emissions are analyzed as well.<br/>
포장도로 종단평탄성 추정을 위한 이미지 기반 머신러닝 및 분류학습 모델 개발
이영재 ( Lee Youngjae ),박성월 ( Piao Xingyue ),고은별 ( Koh Eunbyul ),김은주 ( Kim Robin Eunju ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
도시와 산업의 발전에 따라 주요 사회기반 시설물인 도로의 활용과 시설물 수가 급속도로 증가하였고, 차량의 수 또한 증가하였다. 이와 같은 사용 증가로 도로의 균열 혹은 포트홀과 같은 성능 저하가 발생했다. 과거 이러한 도로파손은 인력을 기반으로 관리되었다. 하지만 최근에는 보다 정량적인 측정을 위해 로드스캐너와 같은 장비를 통한 검사가 이루어지고 있고, IT 산업의 발전과 함께 컴퓨터 비전이나 머신러닝 등을 도로평가에 활용하려는 움직임이 늘어나고 있다. 본 연구는 2차원 이미지를 기반으로 한 머신러닝 및 분류학습 모델을 통하여 3차원 도로 거칠기 정보를 분석하는 것을 목표로 한다.
Methyl Butanoate의 상세 화학 반응 메커니즘 자동 축소화를 통한 기초 반응 메커니즘의 생성 및 검증
이영재(Youngjae Lee),허강열(Kang Y. Huh) 한국연소학회 2016 한국연소학회지 Vol.21 No.3
In this study, skeletal mechanisms are produced by directed relation graph with specified threshold value and sensitivity analysis based on species database from the directed relation graph. Skeletal mechanism is optimized through the elimination of unimportant reaction steps by computational singular perturbation importance index. Reduction is performed for the detailed mechanism of methyl butanoate consisting of 264 species and 1219 elementary reactions. Validation shows acceptable agreement for auto-ignition delays in wide parametric ranges of pressure, temperature and equivalence ratio. Methyl butanoate has been proposed as a simple biodiesel surrogate although the alkyl chain consists of four carbon atoms. The resulting surrogate mechanism for n-heptane and MB consists of 76 species and 226 reaction steps including those for NOx.