액정의 비등방 물성 및 광학 특성

유창재,이신두,Yu, Chang-Jae,Lee, Sin-Doo 한국광학회 2013 한국광학회지 Vol.24 No.4

액정 디스플레이는 소형에서 대형까지 모두 이용 가능한 가장 확실한 평판 디스플레이 구현 기술로 각광받고 있다. 액정 디스플레이의 동작 원리뿐 만 아니라 성능 개선을 위해, 액정의 비등방성 및 비등방 매질에서 빛의 전파에 대한 이해가 필요하다. 액정 소자의 광학 특성에 영향을 주는 액정의 공간 분포에 관여하는 에너지를 통해 액정 디스플레이의 동작원리를 이해하고, 비등방 매질에서 빛의 편광 해석 방법을 통해 액정 디스플레이의 광학특성에 대해 기술한다. The liquid crystal(LC) display is the most promising technology of the flat panel displays covering all applications from small mobile to large television applications. To understand the operating principles and improve the performances of the various LC displays, one should grasp the anisotropic nature of the LC and the propagation of light in the anisotropic media. Basic formulas governing the distribution of the LC molecules, directly related to the electro-optic effects of the LC devices, are described in view of the macroscopic interaction. Based on the matrix representation, the polarization analysis for the LC devices is also presented.

청각 및 시각자극이 최대하 부하운동시 베타엔톨핀 및 카테콜라민에 미치는 영향

유창재,허종순 한국운동과학회 1998 운동과학 Vol.7 No.1

청각 및 시각자극이 최대하부하운동시의 베타 엔돌핀 및 카테콜라민에 미치는 영향. 운동과학, 제7권 제1호, 19-34, 1998, 트레드밀 최대하 부하운동(70% V˙O₂max)시 가해진 청각·시각 자극이 운동시의 인체내분비계의 반응에 어떤 영향을 미치는지를 규명하기 위하여 여자대학 체육학과 여학생 30명을 운동자극군, 운동자극+청각자극군, 운동자극+시각자극군으로 무선배정하여 운동자극군에게는 트레드밀 부하운동만 운동자극+청각자극군에겐 부하운동중 배경음악을 운동자극+시각자극군에게는 레이저 디스크플레이어를 이용하여 아름다운 산정의 설원에서 세계적인 스키어들의 묘기들 TV 모니터로 상영하여 시각자극을 가하여 부하 운동전·중·후의 혈액을 채취하여 호르몬 농도를 분석한 후 혈액채취시간간, 집단간의 호르몬 농도를 분석한 결과 안정시 베타엔돌핀 농도는 세 집단간에 유의한 차이가 없었으나 온동강도가 증가함에 따라 all-out을 지나 회복기 5분까지 지속적으로 증가하다가 회복기 10분부터 유의하게 감소하는 경향을 나타내었다. 안정시 노르에피네프린 농도는 운동군이 유의하게 높았고 청각·시각자극군 순으로 낮아졌다. 운동부하 중에도 운동군이 높게(p<.001)나타났고, 청각자극군, 시각자극군 순으로 낮아졌으며(p<.001), 안정시 에피네프린 농도는 운동군이 가장 높았고(p<,001), 시각·청각자극군 순으로 낮은 값을 보였는데(p<.001), 운동중·후에는 청각군의 에피네프린 농도가 가장 높았고(p<.001), 운동·시각자극군 순으로 낮아졌다(p<.001). A study on the effects of the auditory and visual stimulations on the endocrine system, Exercise Science, 7(1); 19-34, 1998. This paper was attempted to figure out the effects of the auditory and visual stimulation on the variables of hormone during submaximal exercise load. To achieve the goal, the 30 music-loving(pop and rock music) female university students of P. Women's university were selected as subjects and were randomly devided into three groups : Exercise stimulation group(10 subjects) were stimulated only by treadmill submaximal exercise. Auditory stimulation group(10) were stimulated by background music during treadmill submaximal load test. Visual stimulation group(10) were stimulated by video program through laser disk player during treadmill submaximal test. The conclusions are as follows : β-Endorphin concentration was not effected by three stimulations but as the load test was continued, the level of β-Endorphin concentration was increased significantly. But significantly decreased at 10min of recovery. The level of Norepinephrine concentration of exercise stimulation group was slightly higher than that of another groups in the static state and every blood sampling times. The level of Epinephrine concentration of auditory stimulation group was lower than that of visual and exercise stimulation group in the static state. But that of visual stimulation group was lower than other group in the 6min, 12min of exercise stage. The concentration level of auditory stimulation group was higher than another two group at the all-out time, 5, and 10min of recovery phase.

가시오가피 투여가 혈중 전해질농도에 미치는 영향

유창재,박정순 신라대학교 자연과학연구소 2000 自然科學論文集 Vol.8 No.-

The purpose of this study was to investigate the effect of Acanthopanax teas(by Sang-ill medicine manufacture) on the concentration of electrolyte. The subjects employed were 4 male students who are majoring in physical education and 3 female students who are majoring in dance. Acanthopanax teas were orally administered 3 package/day for 1 month. The results of this study were as follows. 1.There were significant increase in Ca concentration at static state, immediately after the maximal exercise, 5 and 10 min of recovery period, as well. 2.There were no significant differences in Cl concentration at static state, immediately after the maximal exercise, 5 and 10 min of recovery period. 3.In static state, K concentration was increased by Acanthopanax teas but there were no significant differences at immediately after the maximal exercise, at 5 and 10 min of recovery period, as well. 4.There were no significant differences in Mg concentration at static state, immediately after the maximal exercise, 5 and 10 min of recovery period. 5.There were no significant differences in Na concentration at static state, immediately after the maximal exercise, 5 and 10 min of recovety period.

양궁 거리별 기록과 호흡 순환기능

유창재,양정옥 신라대학교 자연과학연구소 2003 自然科學論文集 Vol.11 No.-

The purpose of this study was to assess the effects of cardiorespiratory function of archers on the scores of archery game. 12male and 13female who took part in 81th National Athletic Game as representative archery players of Busan city were selected for this study. They were performed maximal exercise load test for analysis of cardiorespiratory function. The scores analyzed and the records of archery game were used for calculating the coefficient of correlation. Major results of this study were as follows: 1. The variables of anaerobic exercise capacity did not affect on 30m distance shooting record in archery game. 2. The breath holding, VO^2 of 5min at recovery phase, RQ at static state affected on hooting record of 50m distance in archery game of male as well. and VO^2 ml/kg/min of all-out phase and that of 5min at recovery phase, O^2pulse of 5min at recovery phase affected on shooting record of 50m distance in archery game of female respectively. 3. BF of all-out phase affected on shooting record of 60m distance in archery game of female. 4. RQ at static state, BF of all-out phase, BF of 5min at recovery phase, O^2pulse at static state affected on shooting record of 70m distance in archery game of male as well. VO^2 of all-out phase, VCO^2 of 5min at all-out phase, VO^2㎖/㎏/min of all-out phase, and O^2pulse of all-out phase affected on shooting record of 70m distance in archery game of female respectively. 5. The breath holding, HR at all-out phase, VE at static state, RQ at static state, BF at all-out phase, BF of 5min at recovery phase. and O^2pulse at static state affected on shooting record of 90m distance in archery game of male as well. 6. The breath holding, HR at all-out phase, VO^2 of 5min at recovery phase, RQ at static state, BF value of all-out phase, and O^2pulse at static state affected on total score of archery game in male as well. BF value of all-out phase, VO^2 ㎖/㎏/min value of all-out phase, and O^2pulse a all-out phase affected on total score of archery game in female respectively.

PFM/PWM 듀얼 모드 피드백 기반 LED BLU 구동용 LLC 공진 변환 제어 IC 설계

유창재,김홍진,박영준,이강윤,Yoo, Chang-Jae,Kim, Hong-Jin,Park, Young-Jun,Lee, Kang-Yoon 한국전기전자학회 2013 전기전자학회논문지 Vol.17 No.3

본 논문은 Pulse Frequency Modulation(PFM)/Pulse Width Modulation(PWM) 듀얼 모드 피드백 기반 LED 백라이트 유닛 구동용 LLC 공진 변환 제어 IC 설계에 대한 내용을 제시한다. 공진형 변환기에서 하나의 변압기를 사용하면서, 두 가지 출력 전압을 생성할 수 있는 구조를 제안하였으며, Master 출력은 PFM 방식으로 Slave 출력은 PWM 방식으로 제어하도록 설계 하였다. 2차 측 Master 출력을 제어하기 위해서 파워 스위치 제어 신호의 주파수를 조절하는 PFM 피드백과 2차 측 Slave 출력을 제어하기 위해서 파워 스위치 제어 신호의 펄스 폭을 조절하는 PWM 피드백 회로를 설계하였다. 설계된 IC는 $0.35{\mu}m$ 2 Poly 3 Metal BCD(Bipolar-CMOS-DMOS) 공정을 이용하여 레이아웃 되었으며, 면적은 $2.3mm{\times}2.2mm$ 이다. 또한, 설계한 칩은 5 V 공급 전압으로부터 26 mA의 전류를 소모하였다. This paper presents a design of LLC resonant converter IC for LED backlight unit based on PFM/PWM dual-mode feedback. Dual output LLC resonant architecture with a single inductor is proposed, where the master output is controlled by the PFM and slave output is controlled by the PWM. To regulate the master output PFM is used as feedback to control the frequency of the power switch. On the other hand, PWM feedback is used to control the pulse width of the power switch and to regulate the slave output. This chip is fabricated in 0.35um 2P3M BC(Bipolar-CMOS-DMOS) Process and the die area is $2.3mm{\times}2.2mm$. Current consumptions is 26mA from 5V supply.

體力要素間 相關에 關한 硏究(Ⅱ) : 筋力, 持久力, 平衡性을 中心으로 muscle strength, endurance, balance

兪昌在 新羅大學校 1983 論文集 Vol.15 No.-

The purpose of this study is to investigate the relationship of muscle strength, endurance and balance as the physical fitness factors. The objects of this study are fifty girls in physical education department of the Busan Woman's university The results of this study are descibed as follow: 1. In physical fitness factors of muscle strength and endurance, there are a close relation between leg strength and sit-ups, a little relation between grip strength and Harvardstep test, but no relation with other thest items. 2. In physical fitness factors of muscle strength and balance, there are a little relation between back lift and stepping stone test, and a little relation between grip strength and stick test, but no relation with other test items. 3. In physical fitness fctors of balance and endurance, there are a little relation between stepping stone tst and Heeling pull-ups, and a little relation between stick test and sit-ups, but no relation with other test items.

體力要素間 相關에 關한 硏究(Ⅲ)

兪昌在 新羅大學校 1985 論文集 Vol.18 No.-

The purpose of this study is to investigate the relationship among six factors of physical fitness. The objects of this study are fifty girls in physical education department of B women's university in B city. The results of this study are described as follows: 1. In agility and endurance among physical fitness factors, there is a little relation between squat thrust and heeling pull ups, and close relationship between side step and heeling pull ups, but no relationship with other test items. 2. In power and endurance among physical fitness factors, there is a close relationship between vertical jump and sit ups, and a little relation between vertical jump and heeling pull ups. 3. In power and strength among physical fitness factors, there is a little relation between vertical jump and back lift, and a little relation between vertical jump and leg strength. 4. There is no relationship between other test items in each physical fitness factors.

운동강도와 생리주기의 변화가 혈액성분농도에 미치는 영향에 관한 연구

유창재 新羅大學校 1992 論文集 Vol.34 No.1

This paper was attempted to clarify the change pattern of concentration in blood components by the change in menstrual phase, and the response during gradual exercise load. The subjects selected for the experiment were six trained female students and six untrained female. All the subjeets had regular menstrual phase and all were in good health. They performed the maximal exercise on treadmill. Blood collecting was made at the static state, at the time of 40%VO₂max, and all-out time in each menstrual phase. The results are as follows. 1) The level of T-protein concnetration between two groups in three menstrual phase did not appear significantly. At exercise intensities, the level of all-out time was highest and in the 40%VO₂max the level was lowest. 2) Athletic growp's Albumin concentration was slightly higher than nonathletic group's. The level of follicular phase was highe than any other menstrual phase. There was no significant difference among three exercise intersities. 3) The level of Cholesterol concentration was no significant in two groups, in three menstrual phases and three exercise intensities. 4) RBC count was slightly greater in the athletie group than in the nonathletic group. But there were no Significant difference among three menstrual phase and among exercise intensities respectively. 5) WBC count was Slightly greater in the monathletie group than in the athletic group at rest and level exercise phase throughout all menstrual phase. Among exercise intersities. WBC count was greatest in all-out time. 6) Hb concentration was slightly higher in athletic group than in nonathletic group at static state and it was alike in all exercise intensities throughout all menstrual phase. The value was slightly high in the all-out time among three exercise intensities. No significant difference was shown among three menstrual phases. 7) The level of Hct concentration was higher in the athletic group than in the nonathletic group at static state and exercise. Thicker density was seen at all-out time among three exercise intensities.

Disciplinary Sport Physiology Health Education , Sport Medicine : 청각자극이 유산소운동 측정변인에 미친 효과에 관한 연구

유창재,강재형,양정옥,이중숙 ( Chang Jae Yoo,Jae Hyung Kang,Jeong Ok Yang,Joong Sook Lee ) 한국체육학회 1996 국제스포츠과학 학술대회 Vol.1996 No.2

Introduction to Optics for Liquid Crystals

유창재 한국공업화학회 2010 한국공업화학회 연구논문 초록집 Vol.2010 No.-