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[디젤엔진부문] 디젤 연소실 벽면에 충돌하는 분무거동에 관한 연구
원석규(Suk-Jyu Won),박정규(Jung-Kyu Park),원영호(Young-Ho Won) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
To investigate spray behaviors in the diesel combustion chamber, a transparent constant-volume chamber similar to real diesel engine cylinder shape was made. This chamber is pressurized by N2 gas from 0 bar to 25 bar. A fuel injection 양 stem is composed of Boseh in-line 6-cylinder fuel pump and 4-hole nozzle injector. The behaviors of spray injected into this chamber and dispersed after impingement on the cylinder wall are measured two-dimensionally using laser sheet Mie scattering method, and tile effects of ambient pressures arc investigated<br/> 111e measured spray images arc compared with tile computational results using KIVA code Some modification of original KIVA are necessary to give better agreement with experimental results.
경막외강내 스테로이드 투여후 관찰된 혈중 Prolactin 증가와 유즙 분비
원석규(Seok Kyu Won),전용석(Yong Suk Chun),석민호( 대한통증학회 1998 The Korean Journal of Pain Vol.11 No.1
Epidural steroid injection have become one of the most frequently applied conservative option for the management of acute and chronic back pain. As the indications for epidural steroid injections increase so do the adverse responses associated with this procedure. This study reports the succession of 3 patients who developed galactorrhea and hyperprolactinemia after recieving an epidural steroid injection for lumbar radiculopathy and low back pain. Serum prolactin level was elevated in accordance with epidural injection of corticosteroid. We measured the serum prolactin level by immunoradiometric assay method and peak serum prolactin level at above 500, 144.2, 150.3 ng/ml respectively. Also we found the serum prolactin level decreased to nonnal values 3 wks after corticosteroid injection. Galactorrhra ceased in advance of decrease of serum prolactin level. That Hyperprolactinemia and galactorrhea can occur following epidural steroid injection, requires a much larger prospective investigation.
전용석(Yong Suk Chun),원석규(Seok Kyu Won),이명의( 대한통증학회 1998 The Korean Journal of Pain Vol.11 No.1
The presence of an enlarged transverse process on one or both sides of the last lumbar vertebra is a common congenital anomaly of the lumbar vertebra. It is thought to be a genetic or developmental anatomical variant. The first reported assimilation of the fifth lumbar vertebra into the sacrum associated with low back pain was in 1917 by Bertolotti. However, clinical significance of lumbosacral transitional vertebra has not been fully considered due to lack of scientific investigations dealing with it. We experienced a case of symptomatic lumbosacral transitional vertebra during management of low back pain. Low back pain was relieved after infiltration of local anesthetics and steroid into the false joint of lumbosacral transitional vertebra. This result may possibly indicate a significant correlation between low back pain and lumbosacral transitional vertebra.
디젤 연소실 벽면에 충돌하는 분무거동에 관한 실험적/수치적 연구
박정규(Jung-Kyu Park),원석규(Suk-Kyu Won),원영호(Young-Ho Won) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.5
A modified spray impingement model has been developed, which is assessed against experiments for the impinging sprays on the small combustion chamber at various gas pressures. To investigate spray behaviors in the diesel combustion chamber, a transparent constant- volume chamber is made which is similar to the combustion chamber of a real diesel engine. The chamber is pressurized by N₂gas from 0 bar to 20 bar to find the effects of ambient pressures. The behaviors of spray injected into this chamber and dispersed after impingement on the cylinder wall is measured two-dimensionally using laser sheet Mie scattering method.<br/> The physical submodels have been properly modified to improve the prediction capability of original KIVA code to describe the spray behaviors after impingement on the curved cylinder wall. In terms of spray dynamics and evolution, numerical results give qualitatively good agreements with experimental data.