QR 코드 인식 성능 향상을 위한 세그멘테이션 기반 형태 보정 방법론

윤보한,김현하,윤건식,이종태 대한산업공학회 2021 대한산업공학회 춘계학술대회논문집 Vol.2021 No.6

QR 코드 인식 성능 향상을 위한 세그멘테이션 기반 형태 보정 방법론

윤보한,김현하,윤건식,이종태 한국경영과학회 2021 한국경영과학회 학술대회논문집 Vol.2021 No.6

열 태양광 발전을 위한 원형 홀 패턴의 Metal-Dielectric-Metal 선택형 방사체

윤보람(Boram Yoon),이남규(Namkyu Lee),배지열(Ji-Yeul Bae),Fakadu Tolessa,조형희(Hyung Hee Cho) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.5

본 연구에서는 열 태양광 발전을 위한 원형 홀 패턴의 Metal-Dielectric-Metal 선택형 방사체를 제안한다. 텅스텐과 산화 알루미늄을 구조체 전체적으로 사용하여 내열성을 확보하였다. 설계 변수의 변화에 따른 흡수/방사 특성을 분석하였고, 이를 통해 InGaAs 셀의 높은 변환 효율을 갖는 파장 대역에서 선택적으로 높은 방사율을 갖는 구조체를 형성하였다. 높은 흡수/방사의 파장 대역에서 텅스텐 원형 홀패턴의 가장자리 주변에서 국부적으로 발생하는 표면 플라즈몬 공명이 발생하였다. 이러한 공명은 루프형태의 유도 전류를 형성함으로써 자기장을 유전체 층에 가두는 효과가 있다. 본 연구에서 제안하는 선택형 방사체의 스펙트럼 효율은 1000K에서 41.0%, 1300K에서 63.7 %였다. 이는 동일한 온도의 흑체보다 각각 5배, 3배 높은 효율을 보였다. In this study, we propose a thermophotovoltaic circular hole pattern Metal-Dielectric-Metal selective emitter. Tungsten and aluminum oxides are used to ensure heat resistance. By analyzing the absorption/emission characteristics per the change of design parameters, we obtain optimal design values that secure selectively high emissivity. Localized surface plasmon resonance occurs at the edge of the tungsten circular hole pattern in the high absorption/emission band. This resonance has the effect of confining the magnetic field to the dielectric layer by forming induced loop-like currents. The spectral efficiency of the proposed emitter is 41.0% at 1,000K and 63.7% at 1,300K. It showed five- and three-times higher efficiency, respectively, than the black-body of the same temperature.

알츠하이머병에서 백질 변화 정도에 따른 혈중 요산수치

윤보라,심용수,양동원,김용덕 대한치매학회 2009 Dementia and Neurocognitive Disorders Vol.8 No.2

Background: Uric acid (UA) is now recognized as a natural antioxidant that has neuroprotective properties. While it has beneficial properties, it may directly induce inflammation and vascular events such as atherosclerosis and stroke. In this study, we examined the relation between serum UA level and the burden of hyperintense signals of the cerebral white matter (WM) on Fluid attenuated inversion recovery (FLAIR) in Alzheimer’s disease (AD). Methods: The participants in this study consisted of 71 healthy controls and 129 patients with AD. To assess WM ischemic changes in AD patients, deep white matter (DWM) and periventricular white matter (PVWM) changes were scored as separately, and then their sums were also rated. UA levels were compared between a control and AD group. By using analysis of covariance, we investigated the difference of UA level depending on the clinical WM rating scale. The correlation between WM changes and UA levels was also analyzed. Results: There was significant difference in UA level between the control and AD group (5.59±1.15 mg/dL vs. 4.67±1.16 mg/dL; p=0.001). However, within AD patients, there were no significant differences in UA levels according to the severity of WM changes (4.57±1.22 mg/dL, 4.74±1.03 mg/dL, 4.37±1.39 mg/dL for DWM scores 1,2,3; p=0.28, 4.58±1.24 mg/dL, 4.56±1.05 mg/dL, 4.91±1.15 mg/dL for PVWM scores 1,2,3; p=0.33 and 4.60±1.20 mg/dL, 4.74±1.06 mg/dL, 4.33±1.40 mg/dL for clinical WM rating scales 1,2,3; p=0.29). There was no correlation between the score of Korean version mini-mental status examination and uric acid. Conclusions: The serum UA was decreased in the AD patients regardless of WM rating scores, compared with healthy controls. However, based on the result that showed no difference according to the severity of WM change, it should be considered several possible explanations. These suggest that there is seldom relationship between UA and the burden of WM in AD, although the oxidative injuries play an important role in the pathogenesis of AD. Background: Uric acid (UA) is now recognized as a natural antioxidant that has neuroprotective properties. While it has beneficial properties, it may directly induce inflammation and vascular events such as atherosclerosis and stroke. In this study, we examined the relation between serum UA level and the burden of hyperintense signals of the cerebral white matter (WM) on Fluid attenuated inversion recovery (FLAIR) in Alzheimer’s disease (AD). Methods: The participants in this study consisted of 71 healthy controls and 129 patients with AD. To assess WM ischemic changes in AD patients, deep white matter (DWM) and periventricular white matter (PVWM) changes were scored as separately, and then their sums were also rated. UA levels were compared between a control and AD group. By using analysis of covariance, we investigated the difference of UA level depending on the clinical WM rating scale. The correlation between WM changes and UA levels was also analyzed. Results: There was significant difference in UA level between the control and AD group (5.59±1.15 mg/dL vs. 4.67±1.16 mg/dL; p=0.001). However, within AD patients, there were no significant differences in UA levels according to the severity of WM changes (4.57±1.22 mg/dL, 4.74±1.03 mg/dL, 4.37±1.39 mg/dL for DWM scores 1,2,3; p=0.28, 4.58±1.24 mg/dL, 4.56±1.05 mg/dL, 4.91±1.15 mg/dL for PVWM scores 1,2,3; p=0.33 and 4.60±1.20 mg/dL, 4.74±1.06 mg/dL, 4.33±1.40 mg/dL for clinical WM rating scales 1,2,3; p=0.29). There was no correlation between the score of Korean version mini-mental status examination and uric acid. Conclusions: The serum UA was decreased in the AD patients regardless of WM rating scores, compared with healthy controls. However, based on the result that showed no difference according to the severity of WM change, it should be considered several possible explanations. These suggest that there is seldom relationship between UA and the burden of WM in AD, although the oxidative injuries play an important role in the pathogenesis of AD.

A Microfluidic Conjugated Polymer Sensor Chip

윤보라,어수한,송시몬,김종만 한국고분자학회 2008 한국고분자학회 학술대회 연구논문 초록집 Vol.33 No.1

영작문 센터에 대한 대학생과 대학원생의 인식 차이: 한국인 학습자를 중심으로

윤보라 ( Bora Yun ),조수경 ( Sookyung Cho ) 한국외국어대학교 외국어교육연구소 2023 외국어교육연구 Vol.37 No.2

본 연구는 한국 대학생과 대학원생들이 영작문 센터에 대해 가지는 인식을 비교·대조하고자 한다. 그간 영어권 국가에서의 영작문 센터에 대해서는 많은 연구가 이루어졌던 반면, 영어를 외국어로 사용하는(EFL) 환경에서의 영작문 센터에 대한 연구는 부족한 현황이다. 본 연구는 대학생과 대학원생의 인식이 어떻게 다른지 살펴보고자, 최근에 개설한 한국의 한 영작문 센터를 대상으로 이곳에서 상담을 받았던 대학생과 대학원생 각각 4명에게 인터뷰를 진행하였다. 인터뷰 결과에 대한 질적 분석을 통해, 두 그룹 모두 이전에 영작문 센터에 대한 경험이 없었다는 공통점에도 불구하고 다음과 같은 차이점을 가지고 있음을 알아냈다. 먼저 대학원 학생들이 대학생에 비해 더 명확한 목표 의식을 가지고 있었으며 내용보다는 문법에 대한 피드백을 원하고 있었다. 더불어 대학원생들은 튜터 피드백의 전달 시 완곡 어법 사용을 선호하는 것으로 나타났다. 대학생과 대학원생 사이의 이러한 차이점은 앞으로 영작문 센터가 이 두 그룹의 서로 다른 요구사항을 염두에 두고 상담을 진행해야 할 것임을 시사한다. This study aims to compare and contrast how Korean graduate and undergraduate students differ in their perceptions on English writing centers. Although writing centers are widely and extensively used in the United States, its history is quite short in an English as a foreign language (EFL) context. In a Korean university that recently launched an English writing center, this study conducted semi-structured interviews with four participants of both undergraduate and graduate students to see whether there is any difference in their expectations from the writing center as well as their general perceptions on it. A thematic analysis of the interview data reveals that there exist several key differences between these two groups, although both of them had never experienced the writing center before: graduate students have more specific goals than the undergraduates; they prefer grammar feedback with mitigation while the undergraduates prefer content feedback; and finally undergraduates are more likely to consider it as their privilege to use the writing center. These differences suggest that a writing center should target these two groups with different goals by satisfying what they need in particular.

연구논문 : C2C12 근육세포의 산화적 손상에 대한 홍경천-홍삼 추출물 혼합액 발효물의 보호효과

윤보라 ( Bo Ra Yoon ),김영현 ( Young Hyun Kim ),이종석 ( Jong Seok Lee ),홍희도 ( Hee Do Hong ),이영경 ( Young Kyoung Rhee ),조장원 ( Chang Won Cho ),김영찬 ( Young Chan Kim ),이옥환 ( Ok Hwang Lee ) 한국식품영양학회 2013 韓國食品營養學會誌 Vol.26 No.3

본 연구에서는 피로 회복 또는 원기 외복에 효능이 있는 것으로 알려진 홍경천과 홍삼을 이용하여 홍경천-홍삼 복합발효물의 산화적 손상 억제 효과를 평가하고자 H202로 산화적 스트레스를 유도시킨 C2C12 근육세포에 홍경천-홍삼 복합 발효물의 처리한후, 세포의 morphology, cell viability 및 항산화 효소들의 유전자 발현 양상을 비교, 분석하였다. 홍경천-홍삼 복합 발효물은 C2C12 근육세포의 cell viability를 유의적으로 증가시켰으며, Cu/Zn-SOD, Mn-SOD 및 GPx등과 같은 세포내 한산화 효소의 발현을 증가시킬 뿐만 아니라, 근육세포 분화의 주요 전사인자인 Myo D의 발현 또한 증가시키는 것으로 나타났다. 이상의 결과로, 홍경천-홍삼 복합 발효물은 세포내 항산화 효소 시스템을 증가시켜 외부로부터의 산화적 손상에 대한 방어효능을 갖는 것으로 나타났으며, 향후 in vivo 시스템 이용한 추가적인 연구가 수행된다면, 홍경천- 홍삼 복합 발효물을 이용한 항피로 건강기능식품의 소재개발이 가능할 것으로 판단된다. Rhodiola spp. and red ginseng have been used for food and medicinal applications in disease chemoprevention in many Asian countries. Increased oxidative stress by reactive oxygen species (ROS) has been proposed to be a major cause of muscle fatigue. The present study was designed to investigate the protective effects of a fermented hot-water extract mixture from Rhodiola sachalinensis and red ginseng (MFR) on cell damage and the antioxidant enzyme system in H2O2-induced oxidative stress in skeletal muscle cells. C2C12 myoblasts were treated with various concentrations of NFR (non-fermented Rhodiola sachalinensis extract), FR (fermented hot-water extract from Rhodiola sachalinensis) and MFR for up to 5 days after the standard induction of differentiation, followed by semi-quantitative RT-PCR. MFR treatment dose-dependently protected oxidative damage of C2C12 cells. The treatment with MFR also enhanced mRNA expressions of MyoD, Cu/Zn SOD, Mn-SOD and GPX up to 16%. These results indicate that MFR exerts an anti-oxidative effect through a mechanism (s) that may involve the up-regulation of antioxidant enzymes, which may be important for the cellular redox environment in muscle cells.

캘리퍼 래틀노이즈 개선을 위한 핀부트 영향력 분석

윤보람(Boram Yoon),전경훈(Kyeong Hun Jeon),김용희(Yonghee Kim),변문환(Mun Hwan Byoun) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11

단지형으로 개발된 초고층건축물의 계획특성에 관한 연구

윤보라(Yoon, Bo-Ra),권종욱(Kwon, Jong-Wook) 대한건축학회 2014 대한건축학회 학술발표대회 논문집 Vol.34 No.2

단지형 초고층건축물 개발프로젝트에 대한 비교 연구

윤보라(Yoon, Bo-Ra),박상민(Park, Sang-Min),권종욱(Kwon, Jong-Wook) 대한건축학회 2015 대한건축학회논문집 Vol.31 No.4

The purpose of this study is to identify the planning characteristics of high-rise building development projects by comparing the selected 6 cases in terms of complex development background, master plan, and building plan. Each various development background influenced on the size and arrangement of uses, and caused differences of master plan, and consequently became an critical factor to decide the approaches to and design of high-rise buildings. New town development projects put an emphasis on the residential function with inner circulation, while urban renewal projects activated vertical connections on the basis of business functions to increase the efficiency of urban centers.