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납착조건이 14K 금납을 이용한 티타늄 납착부의 인장강도에 미치는 영향
최정호,김태조,송광엽,박찬운,Choi, Jeoung-Ho,Kim, Tae-Jo,Song, Kwang-Yeob,Park, Charn-Woon 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.3
This study was performed to evaluate the tensile strength of solder joint in titanium and the wettability of 14K gold solder on titanium. Two pieces of titanium rod 30 mm in length and 3mm in diameter were butt-soldered with a 14K gold solder using the electric resistance heating under flux-argon atmosphere, the infrared heating under argon atmosphere, and the infrared heating under vacuum-argon atmosphere. A tensile test was performed at a crosshead speed of 0.5 mm/min, and fracture surfaces were examined by SEM. To evaluate the wettability of 14K gold solder on titanium, titanum plates of a $17{\times}17{\times}1mm$ were polished with #80-#2000 emery papers, and the spreading areas of solder 10 mg were measured by heating at 840 * for 60 seconds. The solder-matrix interface regions were etched by the solution of 10% KCN-10% (NH4)2S2O8, and analyzed by EPMA. The results obtained were summarized as follows ; 1. The maximum tensile strength was obtained when the titanium surface was polished with #2000 emery paper and soldered using the electric resistance heating under flux-argon atmosphere. Soldering strengths showed the significant difference between the electric resistance heating and the infrared heating(p<0.05). 3. The fracture surfaces showed the aspect of brittle fracture, and the failure developed along the interfaces of solder-matrix reaction zone. 4. The EPMA data for the solder-matrix interface region revealed that the diffusion of Au and Cu occurred to the titanium matrix, and the reaction zone showed the higher contents of Au, Cu and Ti than others.
최정호 ( Jeoung Ho Choi ),박영숙 ( Young Sook Park ),임채영 ( Chae Young Lim ),정준영 ( Jun Young Jung ),김성환 ( Seong Hwan Kim ),이원미 ( Won Mi Lee ),한준길 ( Jun Kil Han ),정윤영 ( Yun Young Jung ) 대한소화기학회 2009 대한소화기학회지 Vol.53 No.2
Most common cause of brisk hematochezia is diverticular bleeding in Western countries. It occurs in 15% of patients with diverticulosis and one-third of them appear to be massive. Most of diverticulosis in Western countries occur in the left colon but the right colon is more common in Korea. Especially, the reports of diverticular bleeding on left colon are rare in Korea. We report a case presenting with multiple diverticuli complicated by recurrent massive bleeding restricted to the left colon. 75-year-old female was admitted due to hematochezia and dizziness. On past history, two years and two weeks ago respectively, she was treated of diverticular bleeding with and without diverticulitis. Hemoglobin level was 9.8 g/dL. On Colonoscopy, numerous diverticuli were seen at sigmoid colon upto splenic flexure which showed fresh blood clots in the lumen. We diagnosed her as recurrent massive diverticular bleeding on the sigmoid colon. She received elective laparoscopic left hemicolectomy. (Korean J Gastroenterol 2009;53:111-115)
초고속 전송을 위한 Recursive Selected Mapping HCOC Multi-Code Spread Spectrum 시스템 설계
공형윤 ( Hyung-yun Kong ),최정호 ( Jeoung-ho Choi ),서민구,정휘재 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.2
본 논문은 초고속 전송을 위해 설계된 HCOC(High Capacity Orthogonal Code) 기술을 적용한 Multi-Code Spread Spectrum System에서 발생할 수 있는 PAPR(Peck to Average power Ratio) 문제해결을 위한 연구이다. H(HCOC)MC-SS 시스템의 PAPR 감소를 위해 기본적인 SLM(Selected Mapping) 기법을 적용하였으며, 또한 SLM 기법의 단점인 많은 계산량 감소를 위해 Recursive 방법을 적용한 Recursive SLM HMC-SS 시스템을 제안하였다. 컴퓨터 시뮬레이션을 통해 제안하는 시스템을 검증하였으며, 또한 초고속 전송을 위한 16 QAM-SS 시스템과 4×4 HMC-SS 시스템의 성능을 비교 분석하였다.
대구고니 단백질의 효소적 가수분해물로부터 항산화성 펩타이드의 분리 정제 및 특성
김세권(Se Kwon Kim),최영일(Young Ri Choi),박표잠(Pyo Jam Park),최정호(Jeoung Ho Choi),문성훈(Sung Hoon Moon) 한국수산과학회 2000 한국수산과학회지 Vol.33 No.3
In order to utilize by-products which would normally be discarded in marine processing plants, cod teiset protein was hydrolyzed and antioxidative activity of the hydrolysate was investigated. Antioxidative peptide was isolated using ultrafiltration membrane, ionexchange chromatography on a SP-Sephadex C-25 column, gel filtration on a Sephadex G-15 column, high performance liquid chromatography on an ODS column, and capillary electrophoresis chromatography. Antioxidative activities of the cod teiset hydrolysate were compared with α-tocopherol, one of the commercial antioxidant. The hydrolysate passed through a membrane with molecular weight cut-off (MWCO) 1 kDa was shown the strongest antioxidative activity, and the activity was higher 10% as compared with α-tocopherol. In addition, the peptide isolated by ion-exchange chromatography, gel filtration, and HPLC, respectively, was higher 53% as compared with α-tocopherol, and the amino acid sequence was Ser-Asn-Pro-Glu-Trp-Ser-Trp-Asn.
만성 염증성 장질환에서 Cyclooxygenase-2의 발현: 면역조직화학염색과 실시간 중합효소 연쇄반응의 비교
박영숙 ( Young Sook Park ),김남인 ( Nam In Kim ),이준석 ( Jun Seok Lee ),최정호 ( Jeoung Ho Choi ),임채영 ( Chae Young Im ),전대원 ( Dae Won Jun ),조윤주 ( Yun Ju Jo ),김성환 ( Seung Hwan Kim ),손병관 ( Byung Kwan Son ),이원미 ( W 대한장연구학회 2008 Intestinal Research Vol.6 No.2
Background/Aims: This study compared the results of cyclooxygenase-2 (COX-2) expression in inflammatory bowel disease and tuberculous colitis as evident by immunochemical staining and real time polymerase chain reaction (PCR). Methods: Patients with ulcerative colitis (n=18), Crohn’s disease (n=7), tuberculous colitis (n=7) and 10 normal controls were included. Biopsied colonic mucosa was simultaneously used for immunohistochemical staining and real time PCR. Results: Patients with inflammatory bowel disease and tuberculous colitis showed high COX-2 expression by both methods compared to the normal controls. In Crohn’s disease patients, the real time PCR value correlated well staining grade; this correlation was not evident in ulcerative colitis patients. In real time PCR, grossly normal colonic mucosa in ulcerative colitis also showed higher expression of COX-2 than normal mucosa. Conclusions: Real time PCR value of COX-2 is more representative of inflammation state in inflammatory bowel disease than the value from immunohistochemical staining. (Intest Res 2008;6:128-134)
급성 우하복부 통증으로 내원한 성인 환자에서 Yersinia 감염에 대한 연구
정준영 ( Jun Young Jung ),박영숙 ( Young Sook Park ),백대현 ( Dae Hyun Baek ),최정호 ( Jeoung Ho Choi ),조윤주 ( Yun Ju Jo ),김성환 ( Seong Hwan Kim ),손병관 ( Byoung Kwan Son ),채정돈 ( Jeong Don Chae ),김동희 ( Dong Hee Kim ) 대한소화기학회 2011 대한소화기학회지 Vol.57 No.1
Background/Aims: Clinical manifestations of intestinal yersiniosis include enterocolitis, mesenteric adenitis, and terminal ileitis presenting with fever, right lower quadrant pain, and leukocytosis. According to a previous Korean study in 1997, Yersinia was revealed in two among 15 adult patients with mesenteric adenitis (13%). However, recent reports on the prevalence of Yersinia infection in adult patients are few. The aim of this study was to investigate the prevalence of Yersinia infection in adult patients with acute right lower quadrant pain. Methods: Adult patients (>18 years) who visited Eulji medical center, due to acute right lower quadrant pain were enrolled prospectively from December 2007 to July 2009. Abdominal CT, stool culture, serologic test for Yersinia, and Widal test were performed. Results: Among 115 patients, 5 patients were excluded due to positive Widal test or salmonella culture. In 110 patients, abdominal CT showed right colitis in 20 (18.2%), terminal ileitis in 16 (14.5%), mesenteric adenitis in 13 (11.8%), acute appendicitis in 10 (9.1%), acute diverticulitis in 7 (6.4%), non specific mucosal edema in 36 (32.7%) and no specific lesion in 8 (7.3%). Two (1.8%) of the 110 patients had antibodies to Yersinia. One patient showed acute enteritis and the other patient was diagnosed with acute appendicitis and underwent appendectomy. No Yersinia species were grown on stool or tissue culture. Conclusions: Nowadays, among adult Korean patients presenting with acute right lower quadrant pain, there have been few incidences of Yersinia infection. (Korean J Gastroenterol 2011;57:14-18)