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류호성(Ho-Sung Ryu),송규근(Kyu-Keun Song) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A diesel engine is one of the major prime movers owing to its high chermal efficiency. But due to the recent attention for the environmental pollution. the emissions of diesel became a important problem. So it is needed to understand the characteristics of diesel spray injected into a combustion chamber. Because the diesel combustion is strongly controlled by a fuel injected into a combustion chamber.<br/> In this paper experiments were conducted for the variations of injection pressure (6. 10. 14 MPa). Velocity of motor (500. 750)<br/> 1000rpm) and impinging angle (0 30 45 ) to investigate the characteristics of diesel fuel impinging spray. And the notions impinging width. impinging thickness of the diesel spray are introduced to discuss the structure of the impinging spray
임신부에서 발생한 급성 A형간염의 임상양상과 임신 합병증
류호성 ( Ho Seong Ryu ),박선영 ( Seon Young Park ),임성륜 ( Sung Ryoun Lim ),김형일 ( Hyung Il Kim ),기원주 ( Won Ju Kee ),이금수 ( Geum Soo Lee ),홍건영 ( Gen Young Hong ),조성범 ( Sung Bum Cho ),최성규 ( Sung Kyu Choi ),유종선 ( 대한소화기학회 2010 대한소화기학회지 Vol.56 No.5
Background/Aims: Acute hepatitis A was recently significant increased among women with gestational age in Korea. However, the clinical course and gestational complications have not been fully elucidated in pregnant patients with acute hepatitis A. We evaluated the clinical impact of acute HAV infection in pregnancy. Methods: Twelve pregnant women out of 85 female patients with acute hepatitis A during 6 years were retrospectively reviewed. Results: The median age of the pregnant group was 26.5 years old. The number of patient with acute hepatitis A were 5 cases in the 1st trimester, 3 cases in the 2nd and 4 cases in the 3rd. 4 cases had significant gestational complications. One case experienced the abortion in 1st trimester and one fetal distress was noted in 3rd trimester. The latter case was delivered of a low birth weight infant (2,390 g) caused by premature rupture of membrane in 36 weeks of gestational age. Other two cases experienced premature contraction and they had been required tocolytic treatment. But, all mothers featured full recovery from HAV infection. Except one aborted fetus and one premature birth, Newborn babies were not affected by maternal hepatitis A. Conclusions: Acute HAV infection during pregnancy may be associated with the risk of gestational complications. HAV serology and vaccination for women with gestation age should be considered at high prevalence area of acute hepatitis A. (Korean J Gastroenterol 2010;56:307-313)
슬관절의 퇴행성 골관절염 환자에 대한 관절경적 수술의 유용성
정영복,장의찬,염재광,류호성 ( Young Bok Jung,Eui Chan Chang,Jae Kwang Yum,Ho Sung Ryu ) 대한슬관절학회 1998 대한슬관절학회지 Vol.10 No.1
The arthroscopic procedure has been one of the useful treatment modalitis in osteoarthritis of the knee, which does not respond to conservative treatment. Authors reviewed the resuJts of 61cases of 61 patients(18 males and 43 females) that had been treated with arthroscopic procedures including arthroscopic simple )avage, partial menisectomy, removal of the loose bodies, synovectomy and chondroplasty. The purpose of this study is to evaluate indication and effectiveness of arthroscopic surgery for osteoarthritic knee. 1. Seventy-one percent of sixty-one patients had relief of pain and other clinical symptoms after arthroscopic procedures. 2. Sixty-one pereent were still good at last follow-up more, than one year. 3. The favorable results were obtained after removal of loose bodies or partial menisectomy in association with osteoarthritic knee cornpared with the other procedures. And the poor results were obtained in patients with severe degenerative changes and severe cartilage defects of both femoral condyles. 4. The normal-alignment knees had much better results after arthroscopic surgery compared with valgus or varus knees. Our results suggest that arthroscopic surgery can be one of the good alternative treatment methods for osteoarthritic knee and a time-saving procedure before arthroplastic surgery.
흰쥐의 초기 골절 치유에서 MMP-13 발현에 대한 COX-2 억제제의 영향
강기서 ( Ki Ser Kang ),이한준 ( Han Jun Lee ),이재성 ( Jae Sung Lee ),류호성 ( Ho Sung Ryu ) 대한골절학회 2009 대한골절학회지 Vol.22 No.1
목적: 이 연구는 골절치유에 있어 COX-2 억제제가 MMP-13 발현에 미치는 영향을 알아보려 하였다. 대상 및 방법: 성숙 흰쥐를 25마리씩 두 군으로 나누어 모두 한쪽 대퇴 간부에 인위적으로 골절을 시킨 후 실험군에는 수술 후 1일째부터 COX-2 억제제를 투여하였으며, 대조군에서는 약물 주입 없이 시술 후 2주째 골절부의 가골을 채취하여 조직 검사 및 실시간 reverse transcription polymeric chain reaction (RT-PCR)을 이용하여 MMR-13의 발현을 알아보았다. 결과: 조직학적으로 실험군은 대조군에 비해 유골조직의 형성과 골모세포의 증식이 덜 되었으며, MMP-13 발현의 평균 실시간 RT-PCR의 결과는 실험군에서 1.16±1.05, 대조군에서는 2.84±2.50이었다. 결론: 흰쥐의 조기 골절 치유에 있어 COX-2 억제제는 MMP-13의 발현을 억제하는 것으로 보인다. Purpose: This study investigated the effect of COX-2 inhibitor on the expression of MMP-13 in the healing process of fracture. Material and Methods: Adult Sprague-Dawley rats were divided into two groups of twenty five rats each. Unilateral femoral shaft fractures were created artificially under displacement in all two groups. COX-2 inhibitor was only given to the experimental group from the postoperative day 1. At 2 weeks after fracture the rats were sacrificed and the callus from each group was used for histologic examination and real time RT-PCR for MMP-13 expression. Results: Histologically, proliferation of osteoblasts and formation of osteoid was less abundant in the experimental group. In real time RT-PCR, the mean expression of MMP-13 is 2.84±2.50 in the control group compared with 1.16±1.05 in the experimental group. Conclusion: In the early stage of fracture healing, COX-2 inhibitor suppress the expression of MMP-13.