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비이온계 계면활성제기반 고순도 알루미늄 습식식각을 통한 균일한 마이크로패턴 어레이 제작
장웅기(Woong-Ki jang),전은채(Eun Chae Jeon),최두선(Doo Sun Choi),김병희(Byeong Hee Kim),서영호(Young Ho seo) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.4
In this paper, the effects of a nonionic surfactant on the etch uniformity and the etch profile during the wet-etching process of high-purity aluminum were investigated for the fabrication of uniform micropattern arrays. To improve the surface roughness of a high-purity aluminum plate, a mechanical lapping process and an electrolytic polishing process were used. After electrolytic polishing process, the surface roughness, Ra, of the high-purity aluminum plate was improved from 1.25 ㎛ to 0.02 ㎛. A photoresist was used as an etching mask during the aluminum etching process, where the mixture of phosphoric acid, acetic acid, nitric acid, a nonionic surfactant and water was used as the aluminum etchant. Different amounts of the Triton X-100 nonionic surfactant were added to the aluminum etchant to investigate the effect of a nonionic surfactant during the wet-etching process of high-purity aluminum. The etch rate and the etch profile were measured by an optical interferometer and a scanning electron microscope.
한국인의 위궤양 및 십이지장궤양 환자에서 Helicobacter pylori 감염 빈도
장명국(Myoung Kuk Jang),김학양(Hak Yang Kim),조병동(Byung Dong Cho),장웅기(Woong Ki Jang),김동준(Dong Jun Kim),김용범(Yong Bum Kim),박충기(Choong Kee Park),신형식(Hyung Sik Shin),유재영(Jae Young You) 대한내과학회 1997 대한내과학회지 Vol.52 No.4
N/A Objectives: Peptic ulcer is the major condition that affect numerous individuals every year. In 1983, Warren and Marshall presented the evidence that H. pylori was associated with gastritis and peptic ulcer. Thereafter, K. pylori infection is thought to be a important factor in the pathogenesis of gastric and duodenal ulcer. In western studies, about 58% to 100% of patients with peptic ulcer disease were infected with H. pylori. But in Korea, there is no study about the prevalence of H. pylori infection in peptic ulcer disease despite of its high prevalence and importance. The aim of this study was to investigate the prevalence of H. pylori infection in case of gastric and duodenal ulcer disease in Korea. Methods - We surveyed the prevalence of H. pylori infection of 1031 patients, who were diagnosed as gastric or duodenal ulcer by gastrofiberoscopy. H. pylori infection was evaluated with Rapid Urease Test(CLO test) and/or histology by Wright-Giemsa staining. Results: 1) Peptic ulcer was more frequently developed in males than females, as the frequency of peptic ulcer was 77% in males, and 23% in females. But in view of the prevalence of H. pylori infection, there was no significant difference between males and females, 73% in males and 71% in females. 2) Gastric ulcer was most common in sixth decade(29.8%), but the prevalence of H. pylori infection was peak in fourth(76%), and fifth decade (73%). 3) Duodenal ulcer was most common in fourth decade(26.3%), but the prevalence of H. pylori infection was peak in teenagers(93%) and third decade(87%). 4) The patients who had both gastric ulcer and duodenal ulcer concurrently were most common in sixth decade(27.9%), but the prevalence of H, pylori infection was peak in third decade(100%). Conclusion: We concluded that the majority of peptic ulcer patients in Korea had H. pylori infection. Particularly, young aged patients had higher H. pylori infection rate than old aged.