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태권도 옆차기 동작의 동력학해석과 충격해석에 관한 연구
이중현(Jung-Hyun Lee),이영신(Young-Shin Lee),한규현(Kyu-Hyun Han),이현승(Hyun-Seung Lee),이은엽(Eun-Yup Lee) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.1
Taekwondo is a martial art form and sport that uses the hands and foot for attack and defense. Taekwondo basic motion is composed of the breaking, competition and poomsea motion. In the side kick among the competition motion, the impact force is larger than other kinds of kicks. The side kick with the front foot can be made in two steps. In the first step, the front foot is stretched forward from back stance free-fighting position. For the second step, the rear foot is followed simultaneously. Then, the kick is executed while entire body weight rests on the rear foot. In this paper, impact analysis of the human model for hitting posture is carried out. The ADAMS/LifeMOD is used in hitting modeling and simulation. The simulation model creates the human model to hit the opponent. As the results, the dynamic analysis of human muscle were presented.
Helicobacter pylori 감염에서 CagA 및 VacA 발현과 위 상피세포 증식과의 관계
김남일(Nam Il Kim),이중현(Jung Hyun Lee),이영실(Yeoung Sil Lee),이재욱(Jae Uk Lee),이구(Goo Lee),서정일(Jeong Ill Suh),양창현(Chang Heon Yang),이창우(Chang Woo Lee),윤환중(Hwan Jung Yun),장태정(Tae Jung Jang),김정란(Jung Ran Kim),하경 대한내과학회 2000 대한내과학회지 Vol.58 No.5
N/A Background : Infection with Helicobacter pylori (H. pylori) has been associated with an increased risk for developing gastric cancer. This risk is further enhanced with CagA positive H. pylori strains. Increased epithelial cell proliferation is associated with an increased risk for gastric cancer. The aim of the study was to investigate whether the gastric epithelial cell proliferation was related to the expression of CagA and VacA in H. pylori infection. Methods : The subjects were 77 patients who had undergone diagnostic esophagogastroduodenoscopy with biopsy; 18 gastritis, 18 gastric ulcer, 17 duodenal ulcer and 24 gastric cancer. The expression of cytotoxic genes was determined indirectly by assaying serum IgG antibodies to specific antigens of H. pylori. Gastric epithelial cell proliferation was assessed using immunohistochemical method using Ki-67 monoclonal antibody. Acute and chronic inflammation, intestinal metaplasia and glandular atrophy were scored according to the updated Sydney system. Results : Ki-67 labeling index, acute and chronic inflammation were significantly higher in H. pylori infected persons (n=70, 90.9%) than in uninfected persons (n=7, 9.1%) (p<0.05), but the difference in intestinal metaplasia and glandular atrophy between the two groups was not statistically significant. Ki-67 labeling indices in persons infected with CagA positive strains (n=56, 80.0%) were significantly higher than in persons infected with CagA negative strains (n=14, 20%) (0.55±0.13 vs 0.37±0.17, p<0.05), but the differences in acute and chronic inflammation, intestinal metaplasia and glandular atrophy between the two groups were not statistically significant. No significant difference was found in Ki-67 labeling index, acute and chronic inflammation, intestinal metaplasia and glandular atrophy according to expression of VacA. Conclusion : Gastric mucosal cell proliferation, which might be closely involved in the pathogenesis of gastric carcinoma, was significantly higher in CagA positive H. pylori infected persons.(Korean J Med 58:516-525, 2000)