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혼용열차 구간 곡선부 자갈궤도 캔트 설정의 적정성 검토 연구
송봉환,염형진,박용걸 한국철도학회 2018 한국철도학회논문집 Vol.21 No.11
The purpose of this study is to investigate the optimal cant of curved ballast track according to various vehicleloads and speeds (KTX, AREX and AREX Express) in serviced lines. In this study, three-dimensional finite elementanalysis (FEA) was performed to assess the field cant adequacy for the running stability and performance of track consideringloads and speeds of various trains (AREX, KTX and AREX Express) Further, the interaction behavior of vehicleand track, track support stiffness (TSS) and running stability were evaluated experimentally for current track cant byfield tests. Through comparison of FEA and field test results, optimal cant was determined with consideration of runningstability and maintenance of track. From the results, we can evaluate the optimum cant level through assessmentfor terms of TSS deviation between low and high rail, running stability and track impact factor.
송봉환 최신의학사 1975 最新醫學 Vol.18 No.4
The author had applied anterior fusion technique to seven patients of cervical injury who were admitted to the neurosurgical_ department of B. N. U. H during the last year. They were one case of spine tuberculosis, two cases of cervical H.N.P. and four cases of spine fracture associated with cord injury. ; The obtained results are as follows, 1. The Cloward technique was done to two cases of cervical H. N. P. and one case of acute anterior cervical cord injury. Smith--Robin technique was used in one case of cervical spine tuberculosis and 3 cases of comminuted fracture and compressed fracture dislocation of the cervical spine. 2. Preoperatively 20 pounds of power for skeletal traction and 7 pounds for Halter's traction were applied to increase the width of the intervertebral space. Additional traction was applied by the anesthesiologist and Cloward-spreader was fixed in the intervertebral space. 3. Drilling was performed with the drilling gard which was fixed about 2mm shorter than previously measured antero-posterior diameter of the cervical vertebral body. 4. On drilling and removal of the vertebral body, bone marrow hemorrhage was controlled with bone wax and epidural hemorrhage was controlled with gel foam to prevent hematoma formation. The bone dowel and graft bone was impacted into the previously drilled and removed intervertebral space. 5. The cervical spine had been obtained more good stabilization by increasing the width of the intervertebral space and appling traction. The author thinks that the patients got early rehabilitation by this method.
大腦皮質損傷에 依한 ATPase 活性度 및 電解質 變動에 對한 Diphenylhydantoin의 作用
宋鳳煥 최신의학사 1973 最新醫學 Vol.16 No.6
The purpose of this study is to observe the effects of diphenylhydantoin on the changes of ATPase activity and electrolytes resulting from damage of cerebral cortex by subcortical injection of blood in the rabbit. The experimental results were as follows: 1. ATPase activity of subcellular particle membrane fraction of normal cerebral cortex was increased most markedly when Na+ 50 mM and K+ 5 mM were added in the presence of Mgtt 1. 5 mM and trisATP 1.5 mM. 2. ATPase activity of subcellular particle membrane fraction of normal cerebral cortex was also increased by the existence of diphenylhydantoin, especially in the presence of Na+ and K+ ions. 3. The decreased ATPase activity of damaged cerebral cortex was recovered on the 7th postoperative day. 4. For 3 to 6 hours following subcortical injection of blood, ATPase activity of damaged cerebral cortex was not influenced by the existence of diphenylhydantoin, but increased markedly after 24 hours. However, the ratio of ATPase activity was lower in damaged cerebral cortex than contralateral undamaged cerebral cortex. 5. 'Na'-K+-ATPase activity of subcellular particle membrane fraction of cerebral cortex was markedly increased by subcutaneous injection of diphenylhydantoin in normal and injured rabbits. 6. The increase of water, sodium and chloride contents in the damaged cerebral cortex was markedly reduced by administration of diphenylhydantoin, 7. From these experimental observations, it may be possible to conclude that through promoting the ATPase activity and active transport of cellular sodium ion, the diphenylhydantoin seems to have the effect of reducing cerebral edema in the damaged cerebral cortex.