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이봉수,조동현,김신,조효성,Lee Bongsoo,Cho Dong Hyun,Kim Sin,Cho Hyosung 한국광학회 2004 한국광학회지 Vol.15 No.5
현재 임상적으로 사용되고 있는 안구내시경은 전체 직경이 1 mm 이하로 제한되어 있고, 그 영상분해능 역시 30∼40 lp/mm로 제약되기 때문에 안구내시경 영상의 질을 판단하는데 있어서 가장 중요한 요소는 영상 분해능이라고 할 수 있다. 본 연구에서는 0.23pitch GRIN 렌즈와 5 $\mu\textrm{m}$ 이하의 마이크로 광섬유를 포함하는 미세 영상가이드를 이용한 새로운 광학적 설계로 고 분해능 안구내시경의 확대 영상을 획득하였고, USAF 분해능 target을 이용하여 기존 안구내시경 영상의 분해능과 비교, 분석하였다. An ophthalmic endoscope which is used in medical applications should have the total diameter less than 1 mm. Its image resolution is limited to 30∼40 lp/mm. Therefore, the image resolution is one of the most important factors to decide image quality of the ophthalmic endoscopic images. This study obtained high resolution and magnifying ophthalmic endoscopic images by a new optical design using a 0.23 pitch GRIN lens and high resolution fiber-optic image guide which has less than 5 ${\mu}{\textrm}{m}$ diameter microfibers. The resolutions of images from existing and from a new type of ophthalmic endoscope are measured and compared using a USAF resolution target.
전나무림, 잣나무림 유역(流域)에서 산림시업(山林施業)이 산림(山林)의 수질정화기능(水質淨火機能)에 미치는 영향(影響)(I)
정용호,박재현,김경하,이봉수,Jeong, Yongho,Park, Jae Hyeon,Kim, Kyong Ha,Lee, Bongsoo 한국산림과학회 1999 한국산림과학회지 Vol.88 No.3
이 연구는 전나무림과 잣나무림에서 산림시업(山林施業)(간벌 및 가지치기)이 토양(土壤)의 물리성(物理性) 및 수질변화(水質變化) 등에 미치는 영향(影響)을 파악함으로써 산림시업(山林施業)에 따른 산림(山林)의 수질정화기능(水質淨化機能)을 평가(評價)하기 위한 기초자료(基礎資料)를 제공(提供)하기 위하여 실시하였다. 1996년 3월부터 5월까지 산림시업을 한 광릉시험림 31, 33임반내 전나무림과 잣나무림 유역에서 1998년 3월 1일부터 1998년 8월 4일까지 임분특성(林分特性), 토양(土壤)의 물리적(物理的) 특성(特性), 그리고 강우(降雨), 임내우(林內雨)(수관통과우(樹冠通過雨), 수간류(樹幹流)), 토양수(土壤水), 계류수(溪流水)의 수질동태(水質動態)를 분석(分析)하였다. 산림시험 후 약 2년 6개월이 경과된 1998년 9월 현재, 전나무림과 잣나무림에서 임목의 평균수고(平均樹高), 평균흉고직경(平均胸高直徑)은 시업구가 비시업구 보다 각각 1.8m, 0.6m, 4.7cm, 1.4cm 더 성장하였으며, 시업구는 비시업구 보다 A층 토양에서의 조공극율(粗孔隙率), 총공극율(總孔隙率)은 증가하였으나, 토양(土壤)의 가비중(假比重)은 감소하여 전나무림과 잣나무림에서는 산림시업(山林施業)에 따라 산림토양(山林土壤)의 강수침투구조(降水浸透構造)는 개선(改善)되는 것으로 나타났다. 또한, 전나무림과 잣나무림에서 산림시업(山林施業)으로 임우내(林內雨) 및 토양수(土壤水)의 완충효과(緩衝效果)가 증대(增大)되는 것으로 분석(分析)되었다. This study aims to clarify the effect of forest management practices(thinning and pruning) on soil physical properties and water quality to get the fundamental information on the facility of purifying water quality after forestry practices. Rainfall, throughfall, stemflow, soil and stream water were sampled at the study sites which consist of Abies holophylla and Pinus koraiensis, in Kwangnung Experimental Forest for 6 months from March 1 to August 7, 1998. Average tree height of the management site increased by 1.8m and 0.6m more than that of the non-management site in Abies holophylla and Pinus koraiensis, respectively. Increment of average D.B.H. at the management site showed 4.7cm and 1.4cm more in Abies holophylla and Pinus koraiensis compared with that at non-management sites. Coarse(less than pF2.7) and total porosities of A layer soil at the management site increased more than those at the non-management sites in both stands. Otherwise, soil bulk density resulted in being reversely. Water qualities of throughfall, stemflow and soil water were buffered more by the management practice in both.
감법을 이용한 실리콘 오일 기반의 2채널 광섬유 온도 센서
이동은 ( Dong Eun Lee ),유욱재 ( Wook Jae Yoo ),신상훈 ( Sang Hun Shin ),김민건 ( Mingeon Kim ),송영범 ( Young Beom Song ),김혜진 ( Hye Jin Kim ),장경원 ( Kyoung Won Jang ),탁계래 ( Gye Rae Tack ),이봉수 ( Bongsoo Lee ) 한국센서학회 2016 센서학회지 Vol.25 No.5
We developed a 2-channel fiber-optic temperature sensor (FOTS) using a temperature sensing probe, a fiber-optic coupler, transmitting optical fiber, and an optical time domain reflectometer (OTDR). The temperature sensing probe is divided into a sensing probe and a reference probe for accurate thermometry. A sensing probe is composed of a silicon oil, a FC terminator, a brass pipe, and a singlemode optical fiber and the structure of a reference probe is identical with that of the sensing probe excluding a silicon oil. In this study, we measured the modified optical powers of the light signals reflected from the temperature sensing probe placed inside of the water with a thermal variation from 5 to 70oC. Although the optical power of the reference probe was constant regardless of the temperature change, the optical power of the sensing probe decreased linearly as the temperature increased. As experimental results, the FOTS using a subtraction method showed a small difference (i.e., hysteresis) in its response due to heating and cooling. The reversibility and reproducibility of the FOTS were also evaluated.
현장데이터를 이용한 신축관 이음의 복합수명예측 모델 개발
오정수(Jungsoo Oh),이봉수(Bongsoo Lee) 한국신뢰성학회 2019 신뢰성응용연구 Vol.19 No.1
Purpose: A field data are applied to the joints of expansion for deriving of failure lifespan prediction model. Methods: We presumed that internal pressure and temperature condition inside the expansion as the factors that accelerate the durability at the time of vibration durability test, which was executed by accelerating the pressure and temperature condition. Results: Hypothesis was made that the lifespan data for each pressure condition comply with inverse power model and it was verified. In addition, in the case of temperature condition, hypothesis was made that lifespan data comply with the Arrhenius model and it was verified by inducing the coefficient value of each model formula. On the basis of the each of the induced lifespan prediction formula, Eyring model-based lifespan prediction model formula was induced by reflecting the temperature and pressure condition simultaneously, and it was verified. Conclusion: We proposed mixed lifespan prediction model for expansion joint based on field data using accelerated life test.
정순철(Soon-Cheol Chung),이법이(Beob-Yi Lee),최미현(Mi-Hyun Choi),탁계래(Gye-Rae Tack),이봉수(Bongsoo Lee),엄진섭(Jin-Sup Eom),손진훈(Jin-Hun Sohn) 대한해부학회 2005 Anatomy & Cell Biology Vol.38 No.3
본 연구에서는 자기공명영상을 이용하여 20대와 40대 정상 한국인 뇌실의 표준 부피를 계측하고 연령과 성별에 따른 뇌실 부피의 차이를 알아보고자 하였다. 20대 118명(남자 58명, 여자 60명)과 40대 100명(남자 41명, 여자 59명) 총 218명을 대상으로 MR 뇌 영상을 획득하였다. 횡단면, 시상면, 관상면 세 단면 각각에 대해 자동과 수동의 방법을 병행하여 뇌실 부분을 분리하고 부피를 계측하였다. 연령과 성별에 따른 차이와 연령과 성별의 상호 작용 효과를 관찰하기 위해, 연령(2수준)과 성별(2수준)을 독립변인으로 한 이원 변량분석(twoway ANOVA)을 이용하여 통계처리를 수행하였다. 20대 한국인의 평균 뇌실 부피는 16.2 [cm3]이었고, 40대는 평균 23.1 [cm3]이었다. 20대와 40대 한국인 남자의 평균 뇌실 부피는 21.9 [cm3]이었고, 여자는 17.5 [cm3]이었다. 20대에 비해 40대가, 여자에 비해 남자의 뇌실 부피가 유의하게 컸다. 또한 연령이 증가할수록 남자의 뇌실 부피 증가가 여자에 비해 유의하게 컸다. 결론적으로 20대와 40대 정상 한국인의 뇌실 부피 계측 결과 연령과 성별에 따라 유의한 차이가 있었고 연령에 따른 뇌실부피 증가는 여자에 비해 남자가 더 컸다. The purpose of this study is to measure the standard volume of the ventricle of normal Koreans in their 20s and 40s and find out difference in the volume of the ventricle according to age and gender. We collected MR brain images from 118 people in their 20s (male 58, female 60) and 100 people in their 40s (male 41, female 59), so a total of 218 people. For each of sagittal, coronal and axial sections, the ventricular part was segmented using automatic and manual methods, and the volume was measured. In order to observe difference according to age and gender and to observe the interactive effect between age and gender, two-way ANOVA was carried out using age (2 levels) and gender (2 levels) as independent variables. The average volume of the ventricle of Koreans in their 20 s was 16.2 [cm3] and that of Koreans in their 40s was 23.1[cm3]. The average volume of the ventricle of male Koreans in their 20s and 40s was 21.9[cm3] and that of female Koreans was 17.5 [cm3]. The volume of the ventricle was significantly larger in Koreans in their 40s than those in their 20s, and in male Koreans than in female ones. Moreover, the increase of the volume of the ventricle with age was significantly larger in male Koreans than in female ones. According to the results of measuring the volume of the ventricle of normal Koreans in their 20s and 40s, the volume was significantly different according to age and gender, and the increase of the volume of the ventricle with age was significantly larger in men than in women.