Photopolymer를 이용한 반사형 회절격자의 효율 및 동적특성 분석

최윤선,윤병호,김남,Choi, Yoon-Sun,Yoon, Byeong-Ho,Kim, Nam 한국광학회 1998 한국광학회지 Vol.9 No.5

홀로그래픽 기록매질 중 광정보처리나 광메로리 등에 응용연구가 활발히 진행되고 있는 포토폴리머(photopolymer)의 특성과 구조를 분석하였다. 특히, Du Pont 폴토폴리머 OmniDex 706반사형 필름을 사용하여 노광량과 입사각도에 대한 실험을 하였고 유리건판에서 반사된 빛에 의해 생기는 간섭 패턴을 분석하였다. 광중합반응시 홑몸체(monomer)의 암반응을 이용하여 고정된 노광량에서 노출시간의 변화, 노출후 확산시간 지연이란 동적인 파라미터를 설정하여 노출시간(exposure time) 6.25ch, 노출후 확산시간 지연(diffusion time delay)2분에서 회절효율의 성능을 10[%]향상시켰다. The characteristics and structures of photopolymer are analyzed in this paper, which recently have various applications in optical information processing and optical memory, Especially, Du Pont's photopolymer OmniDex 706 reflection film is used in many experiments of different exposures and incident angles, and analyzed by the diffraction pattern generated by glass plate's reflection beam. With the dark reaction of the monomer in photopolymerization, dynamic parameters are considered due to the variation of exposure time and diffusion time delay after exposure. The performance of diffraction efficiency is improved by 10%, when an exposure time is 6.25 sec, and a diffusion time delay is 2 minute.

축산유역 수질특성 분석

최윤선 ( Choi Yoon-sun ),홍성구 ( Hong Seong-gu ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-

Land application is one of the desirable management practices for animal wastes. Majority of livestock farms adopt composting and land applications for the management of animal waste in this country. Meanwhile, there are only a few studies related with the effects of land application on pollutant loading. This study investigates the water quality characteristics in a rural watershed with intensive livestock farming. The results indicate that major constituents of water quality are substantially increased at the sites near livestock farms and compost incorporated fields during the rainfall-runoff periods. There are no significant differences of water quality parameters among the sampling sites during no rain periods.

Sodium, Potassium 섭취와 성장기 혈압과의 관계

최윤선(Yoon-Sun Choi),김영옥(Young-Ok Kim),서일(Il Suh) 한국식품영양과학회 1995 한국식품영양과학회지 Vol.24 No.4

본 연구는 경기도 강화군 강화읍에 거주하는 남녀 418명을 대상으로, 식생활 요인이 혈압에 미치는 영향을 규명하기 위해 시도되었다. 식생활 요인 중 특히, sodium(Na)과 potassium(K)의 섭취가 성장기 청소년들의 혈압에 미치는 영향을 규명해 보고자 하였다. 식이 섭취조사를 통해 나타난 연구대상자의 열량 섭취량은 남ㆍ녀 각각 2476.5, 1826.4K㎈였고 단백질(total protein)은 남ㆍ녀 각각 84.95, 66.6g이었다. 콜레스테롤은 남ㆍ녀 각각 235.5, 234.6㎎으로써 미국인 권장량의 70% 수준이었다. 다가불포화지방산과 포화지방산의 섭취비율인 P/S비율도 이상적인 섭취비율인 1과 근접하여 본 연구집단의 식이섭취 양상은 고혈압에 관한 식이성 위험인자를 적게 내포하고 있는 것으로 나타났다. Na, K 섭취량과 혈압과의 관계는 남학생의 경우 수축기 혈압에서는 의의 있는 상관관계를 보인 반면 이완기 혈압은 의의있는 상관을 보이지 않았다. 여학생의 경우 수축기의 혈압과 이완기의 혈압 어느 것과도 상관관계를 보여주지 않았다. 그러나, 이러한 모든 관찰은 통계적으로 유의 수준은 아니었다. 성장과 영양요인을 동시에 고려하여 혈압에 미친 영향의 우선순의를 다변수 회귀분석에 의해 분석해본 결과 영양요인 보다는 성장을 반영하는 요인이 더 중요한 영향요인으로 나타났다. 성장요인을 통제한 후 순수한 Na, K 섭취수준이 혈압에 미친 영향을 본 결과 몸무게가 적은 그룹에서는 Na, K 섭취수준에 따라 혈압의 변화가 관찰되지 않았으나, 몸무게가 무거운 그룹에서는 Na, K 섭취수준에 따라 혈압이 상승하는 결과를 보여주고 있다. 그러나, 이러한 관찰들은 통계적으로 유의한 수준은 아니었다. 이상의 결과를 통해 성장기 청소년의 식이 중 Na, K섭취는 혈압과 통계적으로 유의한 수준에서 상관관계를 보이지 않았다. To investigate an effect of dietary sodium and potassium on blood pressure, 418 adolescents living in Kangwha area were studied. Two measurements were taken on each blood pressure (diastolic, systolic) and the average of the two readings was used in the analysis. Sodium and potassium intake were estimated by the determination of those electrolytes in 24hr urine. Not only dietary factors but also physical growth factors such as weight, height, arm-circumference and skinfold-thickness were included in the stepwise multiple regression analysis to indentify the relative importance between the factors. The variation of blood pressure both in systolic and diastolic in both sexes was inconsistent with the levels of sodium and potassium intake. The results of multiple regression analysis showed that the physical growth were more influential than nutrient factor. It suggested that hypertension risk factors observed form the adults, may not be identical with that of the growing aged population. After control of the physical growth, there was no significant variation observed by the level of sodium and potassium intake on blood pressure. In summary, the results indicate that growth has been more influential than dietary factor on blood pressure for growing aged population.

성별에 따른 아동의 유능감에 영향을 미치는 관련변인 연구

최윤선 ( Yoon Sun Choi ),김동현 ( Dong Hyun Kim ) 한국초등교육학회 2016 초등교육연구 Vol.29 No.2

본 연구는 아동의 유능감에 영향을 미치는 관련변인을 살펴보고자 하였다. 연구도구는 아동의 유능감 척도를 포함하여 자율성, 공감능력, 모양육태도, 사회적지지로 모두 다섯 개의 척도를 사용하였다. 연구대상은 초등학교에 재학 중인 5,6학년 아동 512명이었다. 연구결과 첫째, 성별에 따라 유능감의 차이가 나타났다. 남아들은 유능감의 하위요인 중 학업적 유능감, 운동적 유능감, 전반적 자아가치감에서 여아보다 높게 유능감을 지각하였다. 둘째, 아동의 유능감은 자율성, 공감능력, 모양육태도, 사회적지지에서 모든 예측변인들과 정적상관을 나타냈다. 자율성, 공감능력, 모양육태도, 사회적 지지가 높을수록 아동의 유능감이 높은 것으로 확인되었다. 셋째, 아동의 유능감을 예측하는 변인은 성별과 유능감의 하위변인에 따라 다르게 나타났다. 대체적으로 유능감에 대해 자율성과 공감능력은 20-47%, 모양육태도는 1-7%, 사회적지지는 2-6%의 설명력을 보였다. The purpose of this study was to examine the variables that affect children’s perceived competence. Five different questionnaires on children’s autonomy, sympathy, mother parenting attitude, social support and perceived competence were used. The sample consisted of 512 fifth and sixth grade elementary school students. The results were as follows: First, gender differences were found on children’s perceived competence. Boys show higher score than girls’ on academic, athletic, general self-worth competence. Second, children’s perceived competence had positive correlation with autonomy, empathy, mother’s fostering attitude, social support. Third, the statistically significant variables predicting children’s perceived competence were different by gender and sub factor of children’s perceived competence. In broad outlines, children’s autonomy and sympathy explained 20-47% percent of variances in children’s perceived competence while mother parenting attitude accounted for 1-7% percent of variances and social support did 2-6% percent of variances in children’s perceived competence.

Clinical Practice Guideline for Care in the Last Days of Life

Jinyoung Shin,Yoon Jung Chang,So-Jung Park,Jin Young Choi,Sun-Hyun Kim,최윤선,Nam Hee Kim,Ho-Kee Yum,남은미,박명희,Nayeon Moon,Jee Youn Moon,강희택,강정훈,박재민,Chung-Woo Lee,김선영,이은정,고수진,Yonghwan Kim,Myongjin Agnes Ch 한국호스피스완화의료학회 2020 한국호스피스.완화의료학회지 Vol.23 No.3

A clinical practice guideline for patients in the dying process in general wards and their families, developed through an evidence-based process, is presented herein. The purpose of this guideline is to enable a peaceful death based on an understanding of suitable management of patients’ physical and mental symptoms, psychological support, appropriate decision- making, family care, and clearly-defined team roles. Although there are limits to the available evidence regarding medical issues in patients facing death, the final recommendations were determined from expert advice and feedback, considering values and preferences related to medical treatment, benefits and harms, and applicability in the real world. This guideline should be applied in a way that takes into account specific health care environments, including the resources of medical staff and differences in the available resources of each institution. This guideline can be used by all medical institutions in South Korea.

대퇴부에 발생한 당뇨병성 근육 경색

곽호윤(Ho Yoon Kwak),배상욱(Sang Wook Bae),최윤선(Yun Sun Choi),강승균(Seung Gyoon Kang) 대한정형외과학회 2012 대한정형외과학회지 Vol.47 No.1

당뇨병 환자에서 빈번하게 합병되는 폐쇄성 혈관 병변에 의한 상하지 원위부의 허혈성 괴사는 잘 알려져 있으나 근육군에 한정되어 발생하는 당뇨병성 근육 경색은 매우 유병률이 적고 드물게 발표되어 적절한 진단이나 치료에 어려움이 많다. 저자들은 대퇴 전내측부에 심한 급성 통증과 국소성 종창을 주소로 내원한 당뇨병성 근육 경색 환자 1예를 경험하였기에 진단 및 치료에 대한 문헌 고찰과 함께 보고하고자 한다. Although ischemia in the distal areas of the limbs due to vascular occlusion is a well recognized systemic condition in patients who have diabetes, infarction of skeletal muscle, not associated with gangrene, is exceedingly rare and the paucity of published cases focused on this condition makes it difficult to determine the most appropriate methods of diagnosis and treatment. The authors encountered a case of diabetic muscle infarction with exquisitely tender swelling on the anteromedial aspect of thigh and herein report the diagnostic work-up and treatment performed on the patient.

후두 편평세포암종의 슬개골 전이

곽호윤(Ho Yoon Kwak),송백용(Baik Yong Song),배상욱(Sang Wook Bae),최남홍(Nam Hong Choi),윤재영(Jae Young Yoon),최윤선(Yun Sun Choi),김은경(Eun Jung Kim) 대한정형외과학회 2000 대한정형외과학회지 Vol.35 No.3

간 종양의 방사선치료에서 위내용적과 종양 위치 간의 관계

전미진,이창걸,이익재,최원훈,최윤선,신동봉,김종대,김세준,하진숙,조윤진,Jeon, Mi-Jin,Lee, Chang-Geol,Lee, Ik-Jae,Choi, Won-Hoon,Choi, Yun-Sun,Shin, Dong-Bong,Kim, Jong-Dae,Kim, Sei-Joon,Ha, Jin-Suk,Cho, Yoon-Jin 대한방사선치료학회 2010 대한방사선치료학회지 Vol.22 No.2

Purpose: It aims to evaluate the location change and tendency of hepatic and intrahepatic tumors according to gastric volume and change of location. Materials and Methods: It studied 9 patients with hepatic tumors who visited Gangnam Severance Hospital from March 2009 to April 2010 and who underwent CT or PET (Positron Emission Tomography) within 2 weeks before CT-simulation. The patients fasted for 6 hours before CT-simulation and drank 240~250 cc of water just before CT or PET for image fusion. Those two types of images were fused to RTP (Radiation Treatment Planning, Pinnacle 8.0h) focusing on bone structure of individual patients. Results: They drank 240~260 cc of water but their stomach volume after drinking water varied from 259.3 cc to 495.4 cc. Even though individual differences existed in the change of stomach volume before and after drinking water, the volume was increased by 130 cc (174%) on average. The change in absolute distance between the centers of tumors ranged from 0.52 cm to 3.04 cm (1.52 cm on average); from 0.1 cm to 1.35 cm (0.44 cm on average) in cranial-caudal direction; from 0.05 cm to 2.75 cm (1.22 cm on average) in left-right direction; and from 0.05 cm to 1.85 cm (0.33 cm on average) in ventral-dorsal direction. Conclusion: It is hard to predict the movement of tumors by observing stomach movement, due to great individual differences; however, it was observed that the location of hepatic tumors was right-sided as the stomach was filled with water. Thus, it is recommended to maintain the fastened state to secure the accuracy of hepatic tumor treatment. If it cannot maintain the fastened state, it is recommended to measure stomach volumes and movement in the patient to consider the movement of hepatic tumors before radiation treatment.

석유제품의 유통구조와 물류체계 분석 -경질제품을 대상으로-

이희연 ( Hee Yeon Lee ),최윤선 ( Yoon Sun Choi ) 한국경제지리학회 2002 한국경제지리학회지 Vol.5 No.1

The purpose of this study is to analyze the distribution structure and the logistics system of light petroleum products from the spatial perspectives. The consumption structure of ;petroleum products has been changed since the mid 1980s. The growth rate of consumption for light products has been much faster than those of heavy products. The distribution structure of the petroleum products is hierarchically established by refining companies, agencies, and gas stations. The petroleum products agencies are distributed unevenly over the country, and the number of gas stations per one petroleum agency are very differentiated by the region. The light products are directly transported from refining factories to oil storages and then are carried to gas stations. According to the locational characteristics, oil storages which play a key role in the logistics system are categorized into three type. The first type is demand-oriented oil storages which are located near or in the large cities to supply the light petroleum products. The second type is harbors-oriented oil storages which are located within harbors. The third type is railway-oriented oil storages which are located along railway stations. In this study, the thresholds of one oil storage and one gas station are calculated based on the size of supply territory for each oil storage. The average number of population demand that allow a oil storage to stay in business is 1.9 million and average number of cars are 477,200.

반구형 커버리지를 갖는 저궤도 위성 TC&R용 원편파 도파관 안테나

최동수(Dong-Su Choi),최윤선(Yoon-Seon Choi),이효진(Hyo-Jin Lee),주대근(Dae-Keun Ju),이선익(Sun-Ik Lee),우종명(Jong-Myung Woo) 한국전자파학회 2021 한국전자파학회논문지 Vol.32 No.11

본 논문에서는 위성과 지상국의 교신을 위해 원격측정명령계(telemetry, command, ranging, 이하 TC&R)에 필요한 7.0 ∼8.5 GHz(중심주파수: 7.2 GHz, 8.4 GHz)의 대역에서 반구형 커버리지를 갖는 저궤도 위성 TC&R용 도파관 안테나를 제안하였다. 제안된 안테나는 도파관 내부에 septum 구조를 활용하여 원편파를 발생시키고, 축비 대역폭을 확대시켰다. 또한, 원편파를 유지하는 범위 내에서 방사 패턴의 빔 폭을 확대시키기 위해 구형 도파관의 개구부 끝 외부에서 corrugate 구조의 벽을 추가하고, offset시켰다. 그 결과, 반구형 커버리지 특성을 만족하였고, ±60° 내에서 10 dB 내외의 축비를 얻었으며, 공진주파수에서 −3 dB 빔 폭 내 모든 각도의 평균 이득이 −2.51 dBi로 저궤도 위성 TC&R용 안테나로 충분한 빔 폭 및 축비와 이득을 확보하였다. In this study, we suggested a waveguide antenna for low-orbit satellite TC&R with hemispherical coverage in the X-band of 7.0~8.5 GHz required for the telemetry command system (Telemetry, Command, Ranging, hereinafter TC&R) for communication between the satellite and the ground station. The proposed antenna is designed using a septum structure inside the waveguide to generate a circularly polarized wave and expand the axial bandwidth. In addition, to extend the beam width of the radiation pattern within the range of maintaining the circularly polarized wave, an outer wall of a corrugated structure was added and offset at the end of the opening of the spherical waveguide. Consequently, the hemispherical coverage characteristics were satisfied, and an axial ratio of around 10 dB was obtained at ±90°. In addition, the average gain of all angles within the beam width at the resonant frequency was −2.9 dBi. Accordingly, sufficient beam width, axial ratio, and gain were secured as antennas for low-orbit satellite TC&R.