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RISS 인기검색어
- 검색키워드
- 저자 : 유욱재(Wook Jae Yoo) (검색결과 44 건)
- 무료
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- 유료
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유욱재,백지윤,조동현,장경원,서정기,허지연,이봉수,조영호,박병기,문주현,Yoo, Wook-Jae,Baek, Ji-Yun,Cho, Dong-Hyun,Jang, Kyoung-Won,Seo, Jeong-Ki,Heo, Ji-Yeon,Lee, Bong-Soo,Cho, Young-Ho,Park, Byung-Gi,Moon, Joo-Hyun 대한의용생체공학회 2009 의공학회지 Vol.30 No.6
In this study, we fabricated a plastic optical fiber based sensor which can monitor the respiration of a patient. The circumference changes of the abdomen were measured using a mirror, a light source and optical detectors because the circumferences of the abdomen could be varied with respiration. The intensity of the reflected lights were measured according to the changes of distance between mirror and plastic optical fiber connected to a light source and a photodiode-amplifier system using a Y-coupler. The respiration signals of fiber-optic sensor system were compared with those of the respiratory and temperature transducers of the $BIOPAC^{(R)}$ system. It is expected that a fiber-optic respiration sensor could be developed for real time respiration monitoring during MRI procedure based on this study.
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Silver Halide 광섬유를 이용한 의료용 비접촉식 온도 센서 개발
유욱재,조동현,장경원,정순철,탁계래,이봉수,Yoo, Wook-Jae,Cho, Dong-Hyun,Jang, Kyoung-Won,Chung, Soon-Cheol,Tack, Gye-Rae,Lee, Bong-Soo 대한의용생체공학회 2006 의공학회지 Vol.27 No.6
We have developed a noncontact temperature sensor using a silver halide optical fiber. The infrared collimator and focus head are connected both ends of a silver halide optical fiber with SMA connectors and used to collimate radiations of a heat source and to focus them to infrared sensors such as a pyroelectric sensor and a thermopile sensor, respectively. The relation ships between the temperatures of a heat source and the output signals of the infrared sensors are determined to measure the surface temperature of a heat source. The measurable temperature range is from 25 to $60^{\circ}C$. It is expected that a noncontact temperature sensor using a silver halide optical fiber can be developed for medical usages such as temperature monitoring during hyperthermia, cryosurgery, laser surgery and diagnostic procedure based on the results of this study.
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‘쓰가루’ 사과에서 전분반응지수에 기초한 수확전 낙과방지제 Aminoethoxyvinylglycine의 처리 적기 탐색
유욱재(Wook-Jae Yoo),강인규(In-Kyu Kang),권헌중(Hun-Joong Kweon),김목종(Mok-Jong Kim),김대현(Dae-Hyun Kim),이동훈(Dong-Hun Lee),변재균(Jae Kyun Byun) 한국원예학회 2006 원예과학기술지 Vol.24 No.1
This study was carried out to find the proper timing of aminoethoxyvinylglycine (AVG) treatment to control of preharvest fruit drop in ‘Tsugaru’ apple based on starch pattern index (SPI) at four orchards (Gyeongju, Gyeongsan, Gunwi, and Yeongju). AVG (75 and 125 ㎎ㆍℓ?¹) when SPI was 0.5 and 1.0 was sprayed, respectively. We compared with days which SPI reached to 0.5 and 1.0 in between Gyeongju and Yeongju. It was 14 and 10 days faster to reach SPI 0.5 and 1.0, respectively. The result showed that AVG treatment when SPI reached to 0.5 and 1.0 was effective to prevent preharvest drop of ‘Tsugaru’ apple fruits in all four regions. There was no significant difference between AVG concentration (75 ㎎ㆍℓ?¹ vs. 125 ㎎ㆍℓ?¹). Both flesh firmness and soluble solids contents had not effect by AVG treatment at commercial harvest date. But the AVG treated fruit harvested 2 weeks after commercial harvest date had higher flesh firmness than control. Acidity in AVG treated fruits was higher than control, while color, SPI, respiration, or ethylene production were decreased. It was the most effective to prevent preharvest drop in ‘Tsugaru’ apple when 125 ㎎ㆍℓ?¹ of AVG was sprayed at 0.5 SPI. This was extended the harvest time about 10 days without preharvest drop.
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유욱재 ( Wook Jae Yoo ),서정기 ( Jeong Ki Seo ),장경원 ( Kyoung Won Jang ),문진수 ( Jin Soo Moon ),한기택 ( Ki Tek Han ),박장연 ( Jang Yeon Park ),이봉수 ( Bong Soo Lee ),조승현 ( Seung Hyun Cho ),허지연 ( Ji Yeon Heo ),박병기 ( B 한국센서학회 2011 센서학회지 Vol.20 No.4
A reflection-type fiber-optic pH sensor, which is composed of a pH sol-gel film, plastic optical fibers, a mirror, a light source and a spectrometer, is developed in this study. As pH indicators, a bromthymol blue, a cresol red and a thymol blue are used, and they are immobilized in the sol-gel films. The emitted light from a light source is guided by a fiber-optic Y-coupler and plastic optical fibers to the pH sol-gel film in a pH sensing probe. The pH change in the sensing probe gives rise to a change in the color of the pH sol-gel film, and the optical characteristic of reflected light through the pH sol-gel film is also changed. Therefore, we have measured the spectra of reflected lights, which are changed according to the color variations of the pH sol-gel films with different pH values, by using of a spectrometer. Also, the relationships between the pH values and the intensities of reflected lights are obtained on the basis of the color variations of the pH sol-gel films.
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