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단일모드 광섬유를 이용한 비편광 광섬유 자이로스코프의 잡음특성
진영준,박태용,박희갑,Jin, Young-Jun,Park, Tae-Yong,Park, Hee-Gap 한국광학회 2003 한국광학회지 Vol.14 No.2
일반 통신용 단일모드 광섬유를 회전 감지용 광섬유로 사용하는 비편광 광섬유 자이로스코프를 제작하고 특성을 측정하였다. 이 자이로스코프의 잡음특성을 계산하여 예측하고, 신호대 잡음비가 최대가 되는 적정 변조진폭 둥의 최적 동작조건을 추출하였다. 자이로의 불규칙잡음계수를 여러 위상차 변조진폭에 대하여 측정한 결과, 위상차 변조진폭이 2.4 rad인 경우에 0.7$\times$$10^{-3}$ deg/√hr의 작은 불규칙잡음계수를 얻을 수 있었으며, 변조진폭에 따른 잡음특성의 경향이 계산에 의한 예측치와 거의 일치하였다. We have constructed and characterized a depolarized fiber-optic gyroscope that uses a length of single-mode fiber as a sensing loop fiber. We have also calculated the noise characteristics of the gyroscope and have found an optimum phase modulation depth that gives the highest signal-to-noise ratio in the gyroscope. The random walk coefficient as small as 0.7$\times$10$^{-3}$ deg/√hr was obtained at the modulation depth of around 2.4 rad. The random walk coefficients measured at various modulation depths were found to be in reasonable agreement with the calculation.
초음파 피로시험법을 이용한 A356-T6 합금의 초고주파 피로특성 평가
김정호 ( Jeong Ho Kim ),김정식 ( Jung Sik Kim ),이종주 ( Jong Ju Lee ),윤형석 ( Hyung Seok Yoon ),진영준 ( Young Jun Jin ),어순철 ( Soon Chul Ur ) 대한설비관리학회 2013 대한설비관리학회지 Vol.18 No.3
The behavior of very high cycle fatigue in automotive alloy wheels have become a critical issue for safety, due to their prolonged service life. For the test, a specially designed, dedicated ultrasonic fatigue test (UFT)system was utilized to investigate the high cycle fatigue behavior of A356-T6 aluminium alloys. The hourglass-shaped specimens were specifically designed according to the alloy``s dynamic elastic modulus and fatigue-tested up to 109 cycles at room temperature under completely reversed loading conditions of R=-1. SN curve was plotted, showing monotonic decrease in the test range. Cracked area and fracture surface after tests were investigated using a scanning electron microscope(SEM). It was shown that cracks were initiated from a surface flaw and then propagated into the internal area. Fracture surfaces consist of mostly dimples, typically as in other ductile fracture mode. This test method can be an alternative test methods, since it shows several merits over conventional fatigue testing methods such as fast test speed and effectiveness.
흰쥐에서 고칼리 식이에 의해 유도된 지방간 형성에 미치는 감귤발효 추출액의 영향
진영준,문상욱,김기옥,박덕배,김세재 제주대학교 생명과학연구소 2003 제주생명과학연구 Vol.6 No.1
Male Sprague-Dawley rats were orally treated with low and high-doses (50mg and 100mg/Kg of body weight) of either fermented-citrus extract or citrus extract dissolved in 20% ethanol during 6 weeks. The body weight, the level of plasma total choresterol were slightly reduced in higher dose(100 mg/Kg of body weight) of fermented-citrus extract comparing with other groups. but was not significantly different. The fat liver formation induced by high-fat diet were significantly reduced in rats administrated with fermented citrus-extract. This result suggest that fermented-citrus extract have hepatoprotective activity against high-fat diet induced fatty liver.
혈연간 부분 간이식후 생긴 간동맥 협착에 대한 풍선 확장술 1예
이영호,김영훈,김정태,김상순,최홍조,김형호,나서희,정갑중,진영준,박한석,구봉식,이형두,이수일,이용언 대한혈관외과학회 1997 Vascular Specialist International Vol.13 No.1
Liver transplantation is an accepted and successful mode of treatment for pediatric end-stage liver disease. Living related liver transplatation(LRLT) in child has certain potential advantages, such as short cold ischemic time, accurate graft size and vessel diameter match based on elective preoperative preparations. Recently, introduction of microvasular surgery technique to hepatic artery reconstruction has been used, but still remained the possibility of hepatic artery thrombosis. Herein, We report a LRLT case, which showed hepatic artery stenosis postoperatively, successfully dilated by ballon angioplasty technique.
성별에 따른 술호 경막외자가통증조절에 있어서 Butorhpanol과 Fentanyl의 비교
이황재,진영준,정찬종 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.39 No.3
Background: Differences between sexes in sensitivity to nociceptive stimuli and response to analgesics have been noted in humans and animals. Male rats are more sensitive than female rats to the antinociceptive properties of morphine. Kappa-opioid analgesia is greater in women than in men. The purpose of this study was to evaluate the difference between the sexes in postoperative analgesic responses to patient-controlled epidural analgesia (PCEA) with butorphanol or fentanyl in 0.05% bupivacaine solution. Methods: After obtaining their consents, 30 men and 30 women, less than 60 years old, undergoing elective gastrectomy under general anesthesia were randomly allocated into four groups of 15 butor-phanol-female, butorphanol-male, fentanyl-female and fentanyl-male. An epidural catheter was introduced at the T7-8 or TS-9 interspinous space before the operation. Postoperative analgesia was provided with PCEA with butorphanol 50 ㎍/ml or fentanyl 5 pg/ml in a 0.05% bupivacaine solution. When patients first requred analgesics after complete recovery of consciousness from anesthesia, a bolus of 5 ml was initially administered. The PCEA device was set to deliver a bolus of 2 ml, a lockout interval of 10 min and no basal infusion. PCEA consumption, pain intensity using a 10-cm visual analog score (VAS), patient's satisfaction to PCEA and side effects were evaluated at 3, 6, 24, and 48 h after the surgery. Results: Cumulative PCEA consumption with butorphanol was less in the butorphanol-female group than in the butorphanol-male group at 24 and 48 h postoperatively. VAS pain scores and patients satisfaction to PCEA were not different between the butorphanol-female group and the butorphanol-male group. Cumulative PCEA consumption with fentanyl was less in the fentanyl-male group than in the fentanyl-female group at 6, 24 and 48 h postoperatively. VAS pain scores and patients' satisfaction to PCEA were not different between the fentanyl-female group and the fentanyl-male group. There was no differece in side effects in both butorphanol groups and in both fentanyl groups. Conclusion: For postoperative analgesia with PCEA, butorphanol may be better for females than males, and fentanyl may be better in males than in females.