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RISS 인기검색어
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- 저자 : 이현우(HyunWoo Lee) (검색결과 292 건)
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시간에 종속되는 스트렝스-스트레스 모형연구 - 스트렝스가 변하지 않는 경우 -
이현우,김재주,Lee, Hyunwoo,Kim, Jae Joo 한국품질경영학회 1996 품질경영학회지 Vol.24 No.3
We treat problems of estimating reliability R(t) = P[Y(t) > X(t)] in the time dependent strength-stress model in which a unit of stress X(t) is subjected to environmental strength Y(t) at time t. In this paper we introduce a special model of R(t) with fixed strength and unaccumulated stress case, and propose a Mann-Whitney-Wilcoxon type estimator of R(t).
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실시간 Social Distance 추적에 의한 감성 상호작용 인식 기술 개발
이현우,우진철,조아영,조영호,황민철,Lee, Hyunwoo,Woo, Jincheol,Cho, Ayoung,Jo, Youngho,Whang, Mincheol 한국감성과학회 2017 감성과학 Vol.20 No.3
This study developed a method which recognizes emotional interactions from the social distance by a beacon wearable device. The recognized interaction was evaluated by comparing with the cardiovascular synchrony from photoplethysmogram (PPG). The interaction was recognized when social distance was maintained for a certain period of time. The cardiovascular synchrony was estimated by correlation anaysis between beat per minute (BPM) from PPG. The maintenance time was determined by Mann-Whitney U test between the cardiovascular synchrony of interaction and non-interaction groups. Fifteen groups (2 persons per a group) participated in the experiment and they were asked to wear the beacon and PPG wearable devices in daily life. Experimental results showed that the interaction groups had more higher cardiovascular synchrony than non-interaction groups and the significant interaction time was determined to be 11 seconds (p=.045). Consequently, the real-time measurement and evaluation of the social network in real space was expected to be improved.
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이현우(Hyunwoo Lee),최영태(Youngtae Choi),이광범(Kwangbum Lee),이정기(Jeongki Lee),김광일(Kwangil Kim),이정화(Jeongwha Lee),임종순(Jongsoon Lim),신영복(Youngbok Sin) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
All across our nation, people live, work, and learn in indoor environments and especially, many people spend more time than ever before inside of cars. Recent years have been increasing attention focused on the air contamination inside auto-cabin. The sources of air contamination inside auto-cabin are roughly divided into internal sources(ex. chemical compounds from interior material) and external sources(ex. tail-pipe emission etc.). The Purpose of this research is to examine the status of worldwide auto-cabin air quality study, and to give the information when research is intended to develop methods to mitigate indoor air problem from auto-cabin.
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자외선 차단 코팅을 위한 나노섬유 멤브레인 및 휴대용 전기방사 시스템 개발
이현우(Hyunwoo Lee),홍성욱(Sunguk Hong),박찬(Chan Park),정현석(Hyunsuk Jung),김형욱(Hyonguk Kim),박철정(Cheol Jeong Park),홍성경(Seong Kyung Hong),조성진(Seong J. Cho) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
As the harmfulness of ultraviolet(UV) rays is widely known, it has become important to protect the skin from ultraviolet rays. However, current sunscreens have the disadvantages of promoting skin disorders due to chemical composition, and short duration. Here, we introduce a novel portable electrospinning system that can coat UV-blocking nanofibrous membrane. Conventional electrospinning systems are not portable, as they include a high voltage power supply(HVPS) that is large in size, heavy in weight, expensive and has a wired power supply. To overcome these limitations, we replaces HVPS with batteries and high-voltage amplifiers. Nanofibers contain nanoparticles to increase the UV blocking effect. In addition, we confirmed UV transmittance, water resistance, and removal test. Unlike conventional sunscreen agents, nanofiber-based sunscreen is expected to be very useful for organ transplant patients or skin disease patients who are vulnerable to UV rays.
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