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Water Jet Peening에 의한 SUS 304의 경도에 관한 연구
이미헌(Lee Mi-Heon),서병훈(Seo Byung-Hun),나승한(Na Seunghan),정성균(Cheong Seong Kyun),이명호(Lee Myeong-Ho) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Material properties of the metal surface can be changed by Water Jet Peening, which uses highly pressurized water. The effect of water jet peening(WJP) on the hardness of SUS 304 is investigated in this study. The specimen was cut into 40 × 40 × 10 ㎜ and polished on one side. Two different methods were used to investigate the change of hardness on the surface of SUS 304. Water Jet Peening(WJP) and Water Cavitation Peening(WCP) methods were used to examine the difference of hardness. The distance between specimen and nozzle was also changed as an important parameter. The hardness data were examined by 40 micro meter interval. The results show that the hardness distribution is different depending on peening methods and peening distance. Water Jet Peening seems to be a good method to increase the hardness of metal surface and further research work on WJP is necessary to increase the practicality.
크론병 환자의 선별에 있어서 일반적인 검사실 소견의 유용성
정훈용(Hwoon Yong Jung),양석균(Suk Kyun Yang),박종범(Jong Beom Park),김영민(Young Min Kim),이미헌(Mi Hun Lee),장혜숙(Hye Sook Chang),박무인(Moo In Park),명승재(Seung Jae Myung),홍원선(Weon Seon Hong),김진호(Jin Ho KIm),민영일(Young I 대한소화기학회 2002 대한소화기학회지 Vol.39 No.3
Background/Aims: The aim of this study was to evaluate the usefulness of laboratory parameters in the screening of Crohn's disease (CD). Methods: A total of 68 patients who were newly diagnosed as having CD at the Asan Medical Center between October 1989 and November 2000 were included in the present study. In addition, 47 patients with irritable bowel syndrome (IBS) were included as controls. There were no differences between the two groups in sex ratio, age, and duration of symptoms at the time of diagnosis. The values of laboratory parameters, including C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), hemoglobin, platelet, white blood cell (WBC), and albumin were compared between the two groups. Results: The rates of abnormal results were significantly different between CD and IBS in all six parameters: CRP (85.3% vs. 6.4%), hemoglobin (70.6% vs. 8.5%), ESR (69.1% vs. 4.3%), platelet (42.6% vs. 0%), albumin (42.6% vs. 0%), and WBC (11.8% vs. 0%). Conclusions: Our data suggest that the laboratory parameters including CRP, hemoglobin, ESR, etc. are very useful in screening CD. More aggressive evaluation of the small and large intestine is recommended when patients with chronic gastrointestinal symptoms show abnormal values in these parameters. (Korean J Gastroenterol 2002;39:186-191)
양석균(Suk Kyun Yang),명승재(Seung Jae Myung),정훈용(Hwoon Yong Jung),홍원선(Weon Seon Hong),김진호(Jin Ho Kim),심기남(Ki Nam Shim),최재원(Jae Won Choe),김해경(Hae Kyung Kim),박무인,이미헌(Mi Hun Lee),김동일(Dong Il Kim),박의련(Eui Ryun 대한내과학회 2001 대한내과학회지 Vol.60 No.6
Background: The current diagnosis of hereditary non-polyposis colorectal cancer (HNPCC) is dependent on a detailed family history based on the Amsterdam criteria proposed by the International Collaborative Group on HNPCC (ICG-HNPCC) in 1990. On recognizing the shortcomings of the ICG-HNPCC criteria, the Korean Hereditary Colorectal Cancer Registry (a subdivision of the Korean Hereditary Tumor Registry) designated the term uspected HNPCC for families who do not fullfill the criteria of the ICG-HNPCC but in whom a genetic basis for colon cancer is strongly suggested. The present study was designed to determine the frequency and define the clinical characteristics of suspected HNPCC. Methods: We analysed the clinical characteristics of 42 suspected HNPCC patients and their family members and compared these characteristics with that of 1,692 non-hereditary colorectal cancer patients. Results : The frequency of suspected HNPCC was 2.4% in our study. The mean age of suspected HNPCC patients at the time of diagnosis was 45.1±9.6 years and that of non-hereditary colorectal cancer patients was 57.4±11.9 years. The incidence of synchronous colorectal cancers in HNPCC was 7.1% and that of non-hereditary colorectal cancers was 0.9%. In suspected HNPCC families, 18 patients had extracolonic malignancies and the stomach cancer was the most common (55.5%). Conclusion : The frequency of suspected HNPCC among total colorectal cancer cases was 2.4% in our study. Tumors in suspected HNPCC differed from non-hereditary colorectal cancers in an early age of onset.(Korean J Med 60:507-513, 2001)
골수로의 원격전이를 동반한 위장의 저등위 점막연관성 림프조직림프종 2 예
김진호,장혜숙,민영일,홍원선,명승재,이미헌,양석균,강경훈,정훈용 대한소화기학회 2000 대한소화기학회지 Vol.36 No.5
Extranodal mucosa-associated lymphoid tissue (MALT) lymphoma constitutes most of the low-grade gastric lymphoma and almost 50% of all gastric lymphoma. The specific recirculation pattern might explain the tendencies of MALT lymphomas to remain localized and to recur preferentially within the gastrointestinal tract. It was known that the rate of gastric MALT lymphoma with bone marrow involvement was low, as less than 10%. We have experienced two patients who presented with nonspecific abdominal pain and dyspepsia. They were diagnosed to have gastric low-grade MALT lymphoma with bone marrow involvement at the time of presentation. The endoscopic findings showed irregular ulcerations. Microscopically, there was monotonous lymphoid infiltration with lymphoepithelial lesions which were consistent with low grade MALT lymphoma. Both patients showed H. pylori-associated chronic gastritis. The results of their bone marrow biopsy showed focal infiltration of neoplastic lymphoid cells. We report two cases of primary gastric low-grade MALT lymphoma with the bone marrow involvement.
김진천,강경훈,홍원선,민영일,정훈용,김해련,하현권,양석균,정성애,주연호,이미헌,박지운 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.4
Pneumatosis cystoides intestinalis (PCI) is defined as the presence of multiple gas filled cysts in the wall of gastrointestinal tract, and was first reported by Duvernoi in 1730 from the pathologic findings at autopsy. The etiology and pathogenesis of this relatively rare but distinctive disorder remain unresolved. We recently experienced a case of PCI, in a 28-year old woman with chronic constipation for about 10 years. The case is presented with review of the literature.
정상적인 위내시경 소견을 보이는 사람의 위점막 조직에서 cagA 유전자 존재의 의의
박주상,윤광희,홍원선,남승우,민영일,정훈용,고진규,김해련,양석균,이미헌,강경훈 대한소화기학회 1998 대한소화기학회지 Vol.31 No.6
Background/Aims: It becomes clear that clinical manifestation of H. pylori infection has marked diversity mainly due to the strain diversity of H. pylori and host susceptibility. Many attempts have been made to identify the pathogenic strains of H. pylori, and have shown that the strain with the gene coding for cagA may be a pathogenic strain. To determine the role of cagA gene in the developrnent of gastroduodenal diseases, it is important to test cagA gene in gastric tissues without gross abwrmality. Methods: In a total of forty-seven persons without abnormal gastroscopic findings, the prevalence of H. pylori was determined by polymerase chain reaction (PCR), CLO test, culture, and histological examination. Genomic DNA was amplified by PCR using the primer specific for the 109-bp product of 16S rRNA gene of H. pylori. The prevalence of cagA gene was examined in 37 persons who were positive in PCR for 16S rRNA gene of H. pylori. The PCR product using primer set specific for cagA gene was a 350-bp sized and represented mid-region of cagA gene. Resnlts: Thirty-two (68.1%) out of 47 persons were infected by H. pylori. Thirty-seven (78.7%) persons showed positive PCR result for H. pylori. The cagA was identified in 28 (75.7%) among 37 H. pylori positive persons. Conclusions: The high prevalence of cagA gene in H, pylori-infeced gastric mucosa was observed in the persons with no specific gross abnormality in gastroscapic examination. These results indicate that the expression of cagA gene is common in H. pylori infected gastric mucosa in Korea. To canfirm the cytotoxie activity, the further studies using other primers are needed.