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도시철도 판토그래프와 강체전차선의 동적 상호작용에 관한 연구
김권기(Kim Kwon-Ki),조용현(Cho Yong-Hyun),김기환(Kim Ki-Hwan),원시태(Won Si-Tae) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Generally, subway runs under the ground, so it uses rigid contact wire. Pantograph and contact wire, they have effect on the contact force each other. This paper is on the dynamic interaction of a pantograph and rigid contact wire system. For this we developed simulation program of current collecting capability for dynamic interaction for pantograph and rigid contact wire. As a result, we got contact force and displacement between pantograph and rigid contact wire. This paper shows the possibility of better pantograph"s suspension design and better maintaining of current collecting capability than present when suspention of pantograph is developed by theoretic result.
급성췌장염에 병발한 가성낭종의 경피적 경위 도관배액술 (Percutaneous Transgastric Catheter Drainage)을 이용한 치험 1예
김경진,김권기,김효종,김병호,이정일,장영운,장린,민영일 대한내과학회 1990 대한내과학회지 Vol.38 No.6
During conservative management of the pancreatic pseudocyst, early surgical interventions should be reserved for patients with an enlarged pseudocyst or in patients who develop complications related to the pseudocyst, such as secondary infection, hemorrhage or rupture. Under these circumstances, external drainage is indicated since the wall of the immature pseudocyst lacks the strength necessary for a safe cyst-enteric anastomosis. However, a higher recurrence rate and mortality can be expected following external drainage. Recently, non-operative catheter drainage of abdominal fluid collections and abscesses has become an alternative to surgical management. We report a case of an enlarged pancreatic pseudocyst treated with percutaneous transgastric catheter drainage instead of surgical drainage. The pancreatic pseudocyst was successfully drained percutaneously using a transgastric approach. The drainage catheter was left in place for six weeks to promote the formation of a fistulous tract between the stomach and the pseudocyst. In the hope that any residual fluid would drain through the fistulous tract into the stomach, we removed the catheter. No complications were encountered.
Tc-Phytate로 확인된 복막 투석액 전이성 수흉에서 흉막 유착술 치험
이태원,김명재,황이숙,김권기,유계수 대한신장학회 1989 Kidney Research and Clinical Practice Vol.8 No.1
Acute or recurrent massive hydrothorax as a complication of CAPD was first reported in 1967 by Unger et al. After that, several additional cases were reported. Talc poudrage and intrapleural tetracycline induced pleurodesis have been attempted to solve the problem. We report a successful case of intrapleural instillation of tetracycline to pleural symphysis and prevent recurrence of CAPD-related hydrothorax which was proved by radioisotope scanning with$quot; Tc-phytate in a patient who refused to change the mode of dialysis.
이태원,안재형,김명재,황이숙,김권기,임천규,박원도 대한신장학회 1992 Kidney Research and Clinical Practice Vol.11 No.4
Hyperlipidemia in diabetic nephropathy is a major risk factor of the cardiovascular complication. And so, we measured the serum lipid, lipoprotein and apoprotein concentrations in 63 diabetic patients with or without nephropathy to evaluate the influence of hyperglycemia, proteinuria and azotema on the serum concentrations of lipid, lipoprotein and apoprotein in diabetic ne- phropathy. The results were as follows; 1) The serum concentrations of cholesterol, triglyceride, total lipid, VLDL-Cholesterol, LDL-Cholesterol, pre B-lipoprotein and B-lipoprotein were significantly higher in diabetics than those in normal controls. 2) The serum concentrations of cholesterol and B- lipoprotein were significantly higher in diabetics with overt nephropathy than those without overt nephropathy. 3) The serum concentrations of cholesterol, VLDL- Cholesterol and pre Bp-lipoprotein were significantly higher in diabetics with renal insufficiency than those with normal renal function. 4) The serum concentrations of cholesterol, LDL- Cholesterol, total lipid, apoprotein B and B-lipoprotein were significantly higher and that apoprotein AI was significantly lower in diabetics with severe proteinuria ($gt;3 g/day) than those with mild to moderate proteinuria ($lt;3 g/day). These data suggest that the hyperglycemia, proteinuria, and azotemia may influence the hyperlipidemia and hyperlipoproteinemia in diabetic nephropathy.
염증성 및 비염증성 사구체신염에서 요중 MCP-1의 차이와 단백뇨와의 관계
홍성표,김명재,이태원,임천규,김권기 대한신장학회 1999 Kidney Research and Clinical Practice Vol.18 No.2
Monocyte chemoattractant protein-1(MCP-1) has been known to play a role in pathophysiology of inflammatory glomerular disease through selective monocyte attraction and activation. The levels of urine and serum MCP-1 in 20 inflammatory glomerular diseases(IgA nephropathy 16, lupus nephritis 4), 17 non-inflammatory glomerular diseases(membranous nephrothy 9, minimal change disease 8), and 10 normal controls were evaluated by ELISA. The secretion of MCP-1 by peripheral blood mononuclear cells(PBMC) was examined in 5 patients with IgA nephropathy, membranous nephropathy, and minimal change disease respectively and 5 normal controls. After 4 week treatment with steroid, the urine and serum MCP-1 levels were followed up in eighteen patients who received steroid therapy. Urinary excretion of MCP-1 was significantly higher in patients with inflammatory glomerular disease(0.78±0.51ng/mg creatinine) compared to normal controls(0.18±0.12ng/mg creatinine). There were no differences in serum MCP-1 levels and MCP-1 production by PBMC between normal controls and patients. Positive correlation between urinary excretion of MCP-1 and proteinuria were observed in the patients with inflammatory glomerular disease but not in the patients with non-inflammatory glomerular disease. Any correlation between serum MCP-1 levels and urinary excretion of MCP-1 or proteinuria was not found. Urinary excretion of MCP-1 and proteinuria were decreased after steroid therapy. However, reduction in urinary excretion of MCP-1 does not seem to be related with decrease in proteinuria. Further studies are necessary to clarify the clinical significances of reduction in urinary excretion of MCP-1 with steroid therapy. In conclusion, our data support some role of MCP-1 in the pathophysiology of inflammatory glomerular diseases. MCP-1, however, does not seem to play an important role in those of membranous nephropathy and minimal change disease.
일반 내시경의 위점막 패턴 근접관찰로 Helicobacter pylori 감염 예측 가능성 연구
윤경한,장영운,조준형,이유호,김권기,김태영,홍성훈,고원진,김정욱,장재영 대한상부위장관ㆍ헬리코박터학회 2014 Korean Journal of Helicobacter Upper Gastrointesti Vol.14 No.1
Background/Aims: Common endoscopic findings in stomachs with Helicobacter pylori infections include antral nodularity, thickened gastric folds, and visible submucosal vessels. These findings are suggestive but not diagnostic of H. pylori infection. Magnifying endoscopy can reveal more precisely the abnormal mucosal patterns in an H. pylori-infected stomach; however, it requires more training, expertise, and time. We aimed to establish a new classification for predicting H. pylori-infected stomachs by non-magnifying standard endoscopy alone. Materials and Methods: A total of 617 participants who underwent gastroscopy were prospectively enrolled from August 2011 to January 2012. We performed a careful close examination of the corpus at the greater curvature maintaining a distance ≤10 mm between the endoscope tip and the mucosal surface. We classified gastric mucosal patterns into four categories: normal regular arrangement of collecting venules (numerous minute red dots), mosaic-like appearance (type A; swollen areae gastricae or snakeskin appearance), diffuse homogenous redness (type B), and mixed pattern (type C; irregular redness with groove) to predict H. pylori infection status. Results: The frequencies of H. pylori infection in patients with a normal regular arrangement of collecting venules pattern and types A, B, and C patterns were 9.4%, 87.7%, 98.1%, and 90.9%, respectively. The sensitivity, specificity, and positive and negative predictive values of all abnormal patterns for prediction of H. pylori infection were 93.3%, 89.1%, 92.3%, and 90.6%, respectively. The overall accuracy was 91.6%. Conclusions: Careful close observation of the gastric mucosal pattern with standard endoscopy can predict H. pylori infection status.