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장재식,강혁주,이중현,서영범,윤병구,김용섭,이구,서정일,양창헌,이창우,김정란,윤환중 東國大學校醫學硏究所 2000 東國醫學 Vol.7 No.-
유암종은 전신에 퍼져 잇는 장크롬친화성 세포에서 기원하는데 위의 유암종은 비교적 드문 질환으로 모든 유암종의 1.9~2.2%에 해당하며 위에 발생하는 종양의 1% 미만에서 보고되고 있다. 유암종은 일반적으로 증상이 비특이적이고 면역조직화학검사에 의해서 진단되기 때문에 과거에는 드물게 발견되었으나 최근 내시경 기기 및 술기의 발전과 검사 빈도의 증가 및 면역조직화학검사의 발달로 진단율이 증가 추세에 있으며, 드물지만 유암종에서 선암과 공존하는 예들이 보고되고 있다. 저자들은 심와부 동통을 주소로 내원한 70세 남자 환자의 상부위장관내시경 검사에서 위체상부의 대만곡에서 0.4×0.4 cm 크기의 중간 함몰을 가진 Yamada 1형의 용종과 함께 전정부의 전벽에서 0.8×0.5 cm 크기의 융기된 점막 소견을 보여 조직학적으로 각각 위유암종 및 위선종임을 확진한 후 내시경적 용종 절제술로 치료한 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Carcinoid tumors are arisen from enterochromaffin cells, which are scattered throughout the body. These tumors are composed of variable numbers of cells that contain endocrine granules in their cytoplasm, which can be identified by immunohistochemistry and electron microscopy. Gastric carcinoid tumors are relatively rare tumor, the reported incidence being 1.9~2.2% of all carcinoid tumors and less than 1% of all gastric tumors. Sometimes, composite carcinoid tumors and adenocarcinoma is reported. We experienced a case of the coincidence of carcinoid tumor and adenoma at the other site of the stomach in a 70 year old male patient. Gastrofiberscope showed 0.4×0.4 cm sized Yamada type I polyp with central depression on the greater curvature of the proximal body and 0.8×0.5 cm sized focal slightly elevated mucosa on the anterior wall of the antrum. The endoscopic biopsy specimens revealed carcinoid tumor and tubular adenoma with moderate atypism, respectively. The carcinoid tumor and adenoma were removed by endoscopic polypectomy. According to the follow-up gastrofiberoscopy after 7 month later, both lesions were nearly normal mucosa except whitish atrophic change after polypectomy.
장재식,김은이,김항준,Chang Jae Sik,Kim Eun Yi,Kim Hang Joon 대한전자공학회 2005 電子工學會論文誌-CI (Computer and Information) Vol.42 No.1
본 논문에서는 복잡한 환경에서 정확한 얼굴영역의 경계를 추출하기 위한 활성 윤곽선 모델(Active Contour Model)을 제안한다. 제안된 모델에서 윤곽선은 레벨 함수 φ의 제로 레벨 집합으로 표현되고, 레벨 집합의 편미분 방정식을 통해 진화된다. 이 때, 제안된 모델에서는 윤곽선의 진화와 종교를 위해 2차원 가우시안 모델로 표현되는 피부색 정보를 이용한다. 이를 통해 잡음 및 다양한 포즈를 가지는 복잡한 영상에서도 정확한 얼굴 경계선을 얻을 수 있는 강건한 추출 방법이 구현된다. 제안된 방법의 유효성을 평가하기 위해서 다양한 영상에 대해서 실험이 이루어졌으며, 그 결과를 geodesic 활성 윤곽선 모델의 결과와 비교하였다. 실험결과는 제안된 방법의 보다 나은 성능을 보여준다. This paper presents an active contour model for extracting accurate facial regions in complex environments. In the model, a contour is represented by a zero level set of level function φ, and evolved via level set partial differential equations. Then, unlike general active contours, skin color information that is represented by 2D Gaussian model is used for evolving and slopping a curve, which allows the proposed method to be robust to noise and varying pose. To assess the effectiveness of the proposed method it was tested with several natural scenes, and the results were compared with those of geodesic active contours. Experimental results demonstrate the superior performance of the proposed method.
만성 신부전 환자의 일반적 대처방식에 영향을 미치는 요인
장재식,장은진,정철호 대한신경정신의학회 2003 신경정신의학 Vol.42 No.3
Objectives:This study was to investigate the factors affecting general coping styles, especially the correlations between coping styles and the variables related to disease history in chronic renal failure patients. Methods:The subjects included 97 chronic renal failure patients who were hospitalized or treated through outpatient service. The Coping Styles Questionnaire (CSQ), Beck Depression Inventory-II and Beck Anxiety Inventory were administered. Results:The patients who were more anxious or depressive used less rational and detachment coping and more emotional and avoidance coping. There were no significant difference in coping styles according to sex, age, education, marital state, occupation, economic state and religion. Number of previous admission was correlated positively with depression and anxiety, and also with emotional and avoidance coping. Duration of illness was correlated positively with detachment and avoidance coping. Duration of dialysis was correlated positively with avoidance coping. After controlling for depression and anxiety, number of previous admission was correlated positively with avoidance coping. Conclusion:These results suggest that maladaptive coping has an important role in development and maintenance of depression and anxiety in chronic renal failure patients. Psychotherapeutic strategies for lessening the maladaptive coping, especially emotional coping, would be necessary for chronic renal failure patients with emotional distress.
SOI 슬롯 광 도파로 기반 단일 및 삽입-분기 채널 링-공진형 바이오·케미컬집적광학 센서의 제원에 대한 감도 해석
장재식,정홍식 한국센서학회 2022 센서학회지 Vol.31 No.2
The effects of ring radius and coupling spacing on the free spectral range (FSR), full width at half maximum (FWHM), quality factor, and sensitivity of single-channel and add–drop channel slot ring resonators were systematically investigated using FIMMPROP and PICWAVE numerical software. The single-channel ring resonator exhibited better characteristics, namely, a wider FSR and narrower FWHM compared with the add–drop structure; thus, it was evaluated to be more suitable for biochemical sensors. The FSR, FWHM, quality factor, and sensitivity for a single channel ring resonator with a radius of 59.4 µm and coupling gap of 0.5 µm were 2.4 nm, 0.087 nm, 17677, and 550 [nm/RIU], respectively.