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가압소결된 다결정 $Bi_2Te_3-Bi_2Se_3$ 열전재료의 열전특성
황창원,홍인근,백동규,최승철,Hwang, C.W.,Hong, I.G.,Paik, D.K.,Choi, S.C. 한국결정성장학회 1994 한국결정성장학회지 Vol.4 No.4
$Bi_2Te_3$계 열전반도체에서 단결정재료는 성능이 우수한 반면에 그 제조에 있어서 긴 공정시간과 그에 따른 구성성분의 손실이 있다. 본 연구에서는 짧은 공정시간으로 단결정 $Bi_2Te_3$계 열전반도체 제조 공저으이 단점을 극복하기 위해서 $Bi_2Te_3$계 열전반도체 제조 공저의 단점을 극복하기 위해서 $Bi_2Te_3$계 열전반도체를 교류 통전 가압법으로 제작하였다. 이 소결 방법에서는 소결시간이 다른 방법과 비교하여 짧기 때문에 Te의 증발로 인한 결함의 발생을 줄일 수 있었으며 제조공정시 재료의 손실도 최소화할 수있었다. 가압 소결한 95 mol% $Bi_2Te_3-5 mol% Bi_2Se_3$ 다결정 열전반도체의 최적의 소결조건은 분말입도, 소결온도, 시간, 압력별로 각각 $125~250 {\mu}m, 400^{\circ}C$, 2분, $1500Kgf/cm^2$이고, 이조건에서 열전성능지수 $Z=2.2{\times}10^{-3}/K$이다. Bimuth telluride base thermoelectrics are prepared by AC current applied hot pressing method. It is possible to minimize the defects arising from the vaporization of Te, thanks to the very short processing time compared to the single crystal growing method. The optimum conditions for the AC applied hot pressing of 95 mol% $Bi_2Te_3-5 mol% Bi_2Se_3$ thermoelectrics are sintering at $400^{\circ}C$, for 2 minutes, under 1500 kgf/$\textrm{cm}^2$, with the particle size of $125 to 250 {\mu}m$, range of powder. The resultant Z value (figure of merit) was $2.2{\times}10^{-3}/K$.
홍정표,최선희,김형권,강남욱,강창원,이은아,양윤식,오성욱,박무정,조만종,정연재 대한내과학회 1996 대한내과학회지 Vol.50 No.1
Subacute necrotizing lymphadenitis(SNL) is first described in 1972 by Kikuchi and Fujimoto independently, which has benign clinical course with characteristic histologic features. The etiology is unknown but clinical and histological features suggest an infectious agent, which has not been identified. The resemblance of lymph node lesions to those of systemic lupus erythematosus has suggested an autoimmune process. We report a case of a 24-year-old woman who presented with cervical lymphadenopathy, fever, cough and pulmonary lesion in chest x-ray. The histopathological features of the lymph nodes showed typical findings consistent with SNL and the chest lesion was diagnosed as pulmonary tuberculosis by positive sputum AFB smear.
절제된 치핵의 조직검사 소견: 치핵조직에 대한 병리학적 검사는 필요한가?
이민로,홍창원,윤상남,박규주 대한대장항문학회 2005 Annals of Coloproctolgy Vol.21 No.3
Purpose: The aim of this study was to determine the necessity for routine pathologic evaluation of hemorrhoidectomy specimens. Methods: Between March 1998 and February 2001, 280 patients (185 males, 95 females) underwent a hemorrhoidectomy at Seoul National University Hospital. All patients had grade III~IV hemorrhoids, and the mean age of the patients was 51 years (range: 21~74 years). All hemorrhoidectomy specimens were examined with a hematoxylin and eosin stain of one representative section by a pathologist. We performed a retrospective analysis regarding the pathologic results for the hemorrhoidectomy specimens. Results: Two hundred sixty-seven specimens (267, 95.4%) had typical hemorrhoids reported as external and internal hemorrhoids, external hemorrhoids, hemorrhoidal varices, and thrombi. Ten patients (10, 3.2%) had additional benign pathologes such as fibroepithelial polyps (6 cases), a flat condyloma (1 case), hypertrophied papillae with a condyloma, like papillomatosis and keratosis (1 case), dyskeratotic squamous cells with koilocytotic atypia (1 case), and an inflammatory polyp (1 case). Interestingly, three patients (3, 1.1%) had carcinomas in the hemorrhoidectomy specimens. Two patients had squamous- cell carcinomas; one suffered from delayed wound healing after a previous hemorrhoidectomy, and the other had indurated lesions on the hemorrhoids. One patients who had under gone a low anterior resection due to stage-C rectal cancer 7 months before had a adenocarcinoma. Conclusions: Because of the possibility of unsuspected anal cancer, we recommend pathologic examination of hemorrhoidectomy specimens, especially in cases of suspected indurated lesions within the hemorrhoids, delayed wound healing after a previous hemorrhoidectomy, or previous history of colon cancer.
궤양성 대장염 환자에서 시행한 J형 회장낭-항문 문합술의 기능적 결과
윤상남,홍창원,이민로,박규주 대한대장항문학회 2004 Annals of Coloproctolgy Vol.20 No.5
Purpose: This study was performed to assess the complications and functional outcomes after a total proctocolectomy and ileal J-pouch anal anastomosis for patients with ulcerative colitis. Methods: We reviewed the medicalrecords of 30 patients who had undergone a total proctocolectomy and ileal J-pouch anal anastomosis for ulcerative colitis from 1992 to 1999 in our hospital. We used questionnaires or telephone interviews to assess the functional outcomes of the patients. The median duration of follow-up was 23 months after the ileostomy take down. Results: The mean age of the patients at the definitive operation was 35.9 (±11.8). The indications for operation were medical intractability (76.7%), suspicious malignancy (13.3%), perforation (6.7%), and hemorrhage (3.3%). The double stapling method was used in 26 patients and the handsewn method in 4 patients. Of the 30 patients, 23 patients completed the functional analysis. Bowel frequency was 6.6 (± 2.6) per 24 hours, with 5.1 (±2.1) in the daytime and 1.4 (±1.3) in the night. Fourteen patients (60.9%) had relatively mild incontinence, and four patients (17.4%) had to wear pads, especially at night. Eighteen patients (78.3%) were able to discriminate flatus from feces, and only one patient (4.3%) suffered from perianal irritation. Twelve patients (52.2%) had to restrict their diets, and five patients (21.7%) took antidiarrheal medications. Pouchitis occurred in three patients (13.0%). Sexual dysfunction was noted in four patients (17.4%), and urinary urgency in one patient (4.3%). There was no functional difference between the double stapling method and the handsewn method. Conclusions: The functional outcomes after ileal J-pouch anal anastomosis for patients with ulcerative colitis were satisfactory, irrespective of the method of anastomosis.