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권우철(Woo-Cheol Kwon),좌경룡(Kyung-Yong Chwa) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.1A
본 논문에서는 방향 네트웍에서 안전한 통신 프로토콜을 연구한다. 본 논문은 Dolev 등의 방법[6]을 따라 일반적인 네트웍을 한 쌍의 전송자와 수신자가 여러개의 채널을 통해 연결되어 있는 모델로 단순화한다. Dolev 등은 채널이 모두 양방향이거나 또는 방향이 모두 전송자에서 수신자인 경우만 다루었으나 여기서는 양방향과 단방향 채널이 동시에 존재하는 경우를 다룬다. 단방향 채널에는 전송자에서 수신자로의 방향 뿐만 아니라 그 역방향으로만 통신이 가능한 채널도 포함된다. 본 논문은 정보이론적으로 안전한 통신이 가능하기 위한 필요충분조건을 구하고 효율적인 알고리즘을 제시한다. 이 알고리즘은 단순화한 모델에서의 채널을 정점분리 경로로 대응시켜 일반적인 방향 네트웍에 적용될 수 있다.
김종렬(Jong Ryoul Kim),권우철(Woo Cheol Kwon),곽병학(Byung Hak Kwak) 대한구강악안면외과학회 1994 대한구강악안면외과학회지 Vol.20 No.2
When parotid duct or gland is lacerated and functional primary repair is not accomplished, three potential complications can occur : sialocele, extraoral salivary fistula and salivary cyst. Sialocele is subcutaneous cavity of saliva which is extravasated from traumatized duct or gland. When the primary injury causing the sialocele is an injured duct, three basic methods of treatment are possible. Basically, the salivary flow must be directed intraorally as extraoral pressure is applied to the region of subcutaneous saliva extravasation, preventing an extraoral fistula. Concomitant daily aspirations of the sialocele may be required. If a sialocele occurs, one should fist attempt the insertion of a catheter via Stensen s duct into the region of the sialocele to direct drainage intraorally, aspirate the sialocele as necessary, and apply an external pressure dressing. If this fails, reexploration and anastomosis of the duct should be attempted. If anastomosis of the duct proves impossible, the proximal duct should be ligated with several silk sutures. The following case illustrates the effective treatment of sialocele by these methods. A 50-year-old man was sent to our department for evaluation of right preauricular swelling. He had deep facial laceration after automobile accident. One week after primary closure, 3.0cm×3.0cm×2.0cm-sized flucturant mass developed. At aspiration, clear yellowish serous water was seen. Sialogram showed accumulation of contrast media at right parotid gland and remnant of contrast media at excretory duct which represents pocket formation. We attempted duct exploation and excision of sialocele. A pressure elastic bandage was applied for 15 days after operation. He had no further complication nor recur after that treatment.
증례 : 호흡기 ; 이물질 흡인과 관련된 기관지 방선균증 1예
노진규 ( Jin Kyu Noh ),정순희 ( Soon Hee Jung ),권우철 ( Woo Cheol Kwon ),이민수 ( Min Su Lee ),리원연 ( Won Yeon Lee ),신계철 ( Kye Chul Shin ),용석중 ( Suk Joong Yong ) 대한내과학회 2009 대한내과학회지 Vol.77 No.5S
기관지 방선균증은 드문 경우로 면역기능이 저하되거나 구강위생이 좋지 않은 경우 발생할 수 있다. 만성적인 경과를 보이기 때문에 진단이 늦어지고 폐암으로 오인되기도 한다. 원발성 기관지 방선균증은 매우 드문 사례로 기관지 방선균증이 의심될 때는 악성종양과 이물질 흡인을 고려하여야 한다. 본 증례는 기관지내시경을 시행하여 생선뼈로 판단되는 이물질과 육아조직을 제거하였으며 기관지세척을 통한 세포학적 검사에서 sulfur granule을 확인하여 기관지 방선균증을 진단하였다. Actinomycosis is a chronic suppurative infection that infiltrates mucosa associated tissues. Primary endobronchial actinomycosis is rare and very uncommon in association with a foreign body aspiration. We diagnosed endobronchial actinomycosis associated with a fish bone aspiration. The patient was a 55-year-old male with no history of hypertension, diabetes, or pulmonary tuberculosis. About 5 years ago, he had an episode of choking while eating fish, and had suffered a chronic cough and sputum since that episode. The patient underwent a fiberoptic bronchoscopy, and granulation tissue and foreign bodies were noted in the right lower bronchus. We diagnosed actinomycosis by the presence of sulfur granules in the bronchial wash cytology. We removed the foreign bodies, which were identified as fish bones, by rigid bronchoscopy. The patient was treated with intravenous antibiotics for 1 week and oral antibiotics for 5 weeks, and his symptoms resolved. Serial fiberoptic bronchoscopy documented a gradual resolution of the granulation tissue and inflammation. (Korean J Med 77:S1178-S1182, 2009)
이석정 ( Seok Jeong Lee ),리원연 ( Won Yeon Lee ),정순희 ( Soon Hee Jung ),권우철 ( Woo Cheol Kwon ),이선녕 ( Shun Nyung Lee ),이남석 ( Nam Seok Lee ),김상하 ( Sang Ha Kim ),신계철 ( Kye Chul Shin ),용석중 ( Seok Joong Yong ) 대한결핵 및 호흡기학회 2008 Tuberculosis and Respiratory Diseases Vol.65 No.6
We report on a case of a patient with laryngo-tracheobronchial amyloidosis who complained of cough, sputum, and hoarseness. A chest X-ray showed consolidation in the right middle lobe. A chest CT scan showed diffuse, irregular narrowing of the tracheobronchial tree and atelectasis of the right middle lobe, with calcification of bronchial wall. Bronchoscopic findings were multinodular submucosal thickening of the right vocal cord, and yellowish multinodular submucosal thickening from the lower trachea through both main bronchi, as well as the lingular division of the left upper lobe, the right middle lobe, and the right lower lobe. The right middle lobe bronchus was nearly obstructed. The diagnosis of amyloidosis was made by multiple bronchoscopic biopsies on the right vocal cord and both bronchi. Pathologic findings were characteristic apple-green birefringence under polarized microscopy with Congo-red stain. The patient had no evidence of systemic amyloidosis. The patient is under conservative symptomatic treatment. (Tuberc Respir Dis 2008;65:532-536)
수술적 제거로 완치된 순수적혈구 무형성을 동반한 흉선종
김은미 ( Eun Mi Kim ),김상하 ( Sang Ha Kim ),권우철 ( Woo Cheol Kwon ),김호영 ( Ho Young Kim ),김종환 ( Chong Whan Kim ),이부길 ( Bu Ghil Lee ),정순희 ( Soon Hee Jung ),이종국 ( Chong Kook Lee ),용석중 ( Suk Joong Yong ) 대한결핵 및 호흡기학회 2007 Tuberculosis and Respiratory Diseases Vol.63 No.5
Thymomas are associated with different paraneoplastic syndromes, with the most clinically important association being with myasthenia gravis, hypogammaglobulinemia, and pure red cell aplasia (PRCA). The optimal therapy for PRCA that complicates a thymoma is unknown, given the rarity of the clinical situation. It has been suggested that remission following surgery alone is uncommon and most patients will require some other form of therapy. We report a case of PRCA with a thymoma in a 59-year-old man who remained in complete remission of the PRCA after surgical resection of the thymoma. (Tuberc Respir Dis 2007;63:454-457)
이달의 X-선 : 중심정맥카테터 삽입의 이상위치로 발생한 편측성 흉수 1례
김재석 ( Jae Seok Kim ),김상하 ( Sang Ha Kim ),이낙원 ( Nak Won Lee ),권우철 ( Woo Cheol Kwon ),최훈 ( Hun Choi ),변종원 ( Jong Won Beon ),홍태원 ( Tae Won Hong ),신계철 ( Kye Chul Shin ),용석중 ( Suk Joong Yong ) 대한결핵 및 호흡기학회 2006 Tuberculosis and Respiratory Diseases Vol.60 No.6
중심정맥카테터 삽입 후 생길 수 있는 드문 합병증 중에 하나인 흉수 발생은 카테터와 관련된 혈관벽의 손상을 흉수 발생의 기전으로 설명하고 있다. 저자들은 우측 쇄골하정맥으로 이어지는 이상혈관 내로 카테터가 위치한 후 혈관 파열로 인하여 발생한 흉수 1례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Central venous catheterization is used to provide a large amount of fluid, total parenteral nutrition and to administer antitumor agents with few complications reported. We report an uncommon case of pleural effusion that occurred after central venous catheterization. In many cases, the mechanism for the pleural effusion after central venous catheterization occurs through an injury to the superior vena cava by the continuous mechanical force of the catheter tip, the flow of large amount of fluid and an osmotic injury to the wall of the vein. This case is somewhat different in that the central catheter was placed in an aberrant vessel resulting in the pleural effusion. A post-placement chest roentgenogram and the correct approach of catheterization are important for preventing this complication. (Tuberc Respir Dis 2006; 60: 690-693)