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Positive Airway Pressure Therapy of Obstructive Sleep Apnea
이호원,박성파 대한수면연구학회 2006 Journal of sleep medicine Vol.3 No.1
Obstructive sleep apnea (OSA) is serious, potentially life-threatening and very common. Untreated OSA can be associated with cognitive impairment, hypertension, heart disease, stroke, increased motor vehicle accidents, and diminished quality of life. Currently positive airway pressure (PAP) is a preferred treatment for OSA. PAP maintains airway patency by creating a pneumatic splint, and then dramatically reduces or eliminates sleep-related respiratory impairments and normalizes sleep architecture. There are three different types of PAP such as continuous PAP, autotitrating PAP, and bilevel PAP. This article will review CPAP treatment of OSA, including mechanism, indication, efficacy, compliance and optimal pressure titration. And alternative therapies such as autotitrating PAP and bilevel PAP will be considered.
이호원,주두환,현철승,박부희,김동효 대한교통학회 2011 大韓交通學會誌 Vol.29 No.6
After heated discussion, National Police Agency decided not to install Red Arrow signal at such major intersections as Gwanghwamoon, Sejongro. The major issues can be summarized in the following reasons. The one is the conflict of color and symbol (red means STOP and arrow means PROGRESS), and it would confuse drivers and may cause traffic accident. The other includes high replacement cost. This paper delivered how much red arrow signal would affect (1) drivers start up delay time, (2) saturation flow rate and (3) vehicle headway. The result showed that there was no statistical difference in those even when a red arrow signal is placed. 3색 화살표 신호등(3색 신호등)을 시범 설치하여 운영하던, 2011년 5월 대한민국은 열띤 토론에 휩싸였다. 논란의 핵심은 두 가지로 요약 할 수 있다. 첫째 3색 화살표 신호등이 운전자에게 혼란을 일으켜 교통사고를 유발 할 수 있다는 것이고, 둘째 예산낭비라는 것이었다. 본 연구에서는 이러한 핵심 논란 중, 3색 화살표 신호등이 운전자에게 혼란을 초래하는지에 대해 초점을 맞춰 연구를 수행하였다. 효과척도(MOE)로는 차두시간을 선정하였다. 운전자가 교차로에 진입하면서 혼란스러워 머뭇거리면 출발손실시간과 차두시간에 영향을 주기 때문이다. 따라서 3색 화살표 신호등 설치 전/후 비교분석을 통해 기존 4구 신호등과 차이가 있는지에 대해 분석을 실시하였다. 현장조사는 총 3개 지점에서 실시하였으며, 설치 전/후 비디오 촬영을 통해 정지선을 통과한 차량의 차두시간을 측정하여 각 지점별 설치 전/후 차두시간을 비교분석하였다. 분석결과, 3개 지점 모두 3색 화살표 신호등 설치 전/후에 차두시간은 통계적으로 차이가 없는 것으로 분석되었다.
이호원,강승훈,이영선 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
In this study, dynamic recrystallization during nonisothermal hot compression test was numerically simulated by finite elementanalysis using new grain aggregate model for dynamic recrystallization. This model was developed based on mean field approachby assuming grain aggregate as representative element. For each grain aggregate, changes of state variables were calculated usingthree sub-models for work hardening, nucleation, and nucleus growth. A conventional single parameter dislocation density model wasused to calculate change of dislocation density in grains. For modeling nucleation, constant nucleation rate and nucleation criteriondeveloped by Roberts and Ahlblom were used. It was assumed that the nucleation occurs when the dislocation density of certain grainreaches a critical nucleation criterion. Conventional rate theory was used to model nucleus growth. The developed dynamicrecrystallization model was validated by comparing with isothermal hot compression of pure copper. Then, the finite element analysiswas conducted to predict the local changes of microstructure and average grain size by using the grain aggregate model. Thepredicted results were compared with nonisothermal hot compression results. The simulation results were in reasonably goodagreement with experimentally obtained microstructures and the calculation time was much shorter than cellular automata-finiteelement method.
이호원,양형진,이재은,김영관,하윤경 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.1
Transparent electrodes and heteroleptic iridium complexes have attracted tremendous scientificinterest to organic light-emitting diodes (OLEDs) because they have an advantage in that transparentelectrodes can replace indium-tin-oxide (ITO) electrode that has structural defects or diffuseindium into the organic layer. Moreover, heteroleptic iridium complexes exhibit high luminescenceand quantum yield, as well as superior device performance. Therefore, we propose the use of flexiblewhite OLEDs with semitransparent Ni/Ag/Ni multi-metal layers and a new combination of iridiumcomplex as an orange phosphorescent emitter. We demonstrate that flexible white OLEDs withITO-free electrodes and new orange phosphorescent emitters have the potential of stable electricaland optical characteristics.
이호원,권지욱,좌동경,홍석교 제어로봇시스템학회 2009 제어로봇시스템학회 국내학술대회 논문집 Vol.2009 No.9
In this paper,we discuss about pose estimation of multiple mobile robots system using by machine vision system.We improve target recognition and pose estimation algorithm that utilize two-dimensional marker which was developed before. First,we set upthree-dimensional marker to each mobile robots. Also, we estimate relative location and pose by getting calibrated image from camera.Then we use position of point on marker and minimizes quantity of processing data differently from past researches. Finally, this paper proposes algorithm thatcan apply to mobile robot by simplifying camera calibration and pose estimation