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이덕우 ( Deok Woo Lee ),양지혜 ( Ji Hye Yang ),원종현 ( Chong Hyun Won ),장성은 ( Sung Eun Chang ),이미우 ( Mi Woo Lee ),최지호 ( Jee Ho Choi ),문기찬 ( Kee Chan Moon ) 대한피부과학회 2009 大韓皮膚科學會誌 Vol.47 No.6
Rudimentary menigocele is a developmental anomaly in which menigothelial elements are present in the skin and subcutaneous tissue. A 9-year-old boy presented with a well-circumscribed, central atrophic and alopecic patch on the midline of the occipital area, and this lesion had been present at birth. Histological examination showed dense collagen bundles with pseudovascular spaces lined by oval, spindle shaped cells in the dermis and the subcutaneous layer. Collagen bodies and psammoma body were also detected. On the immunohistochemistry, these oval, spindle shaped cells were positive for vimentin, but negative for CD31, EMA and S100 protein. (Korean J Dermatol 2009;47(6):743∼745)
이덕우 ( Deok Woo Lee ),박언재 ( Oun Jae Park ),김재경 ( Jae Kyung Kim ),원종현 ( Chong Hyun Won ),장성은 ( Sung Eun Chang ),이미우 ( Mi Woo Lee ),최지호 ( Jee Ho Choi ),문기찬 ( Kee Chan Moon ) 대한피부과학회 2010 대한피부과학회지 Vol.48 No.8
Choriocarcinoma is one of the malignant tumors of trophoblastic cells characterized by secretion of human chorionic gonadotrophin (hCG). Choriocarcinoma often metastasizes to the lung, liver, and brain but skin metastasis is rare. To our knowledge, only one case of cutaneous metastasis was reported in Korea. A 35-year-old female presented with hemoptysis for 1 month. Biopsy from lung nodules revealed metastatic choriocarcinoma. She was subsequently referred to our clinic for evaluation of a rapidly growing, reddish nodule with bleeding tendency on the scalp. Histologic examination demonstrated biphasic pattern of cytotrophoblasts and hCG-positive syncytiotrophoblasts with multiple foci of hemorrhage - typical histologic features of choriocarcinoma. The patient was diagnosed with metastatic choriocarcinoma. We herein report a case of choriocarcinoma with cutaneous metastasis. (Korean J Dermatol 2010;48(8):700~702)
이덕우 ( Deok Woo Lee ),양지혜 ( Ji Hye Yang ),원종현 ( Chong Hyun Won ),장성은 ( Sung Eun Chang ),이미우 ( Mi Woo Lee ),최지호 ( Jee Ho Choi ),문기찬 ( Kee Chan Moon ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.5
Cutaneous and systemic plasmacytosis is a rare disorder that`s characterized by a cutaneous plasma cell infiltrate accompanied by polyclonal hypergammaglobulinemia. Clinically, it appears as multiple red-brown plaques that mainly occur on the trunk, and this is sometimes associated with variable extracutaneous involvement. All the cases of cutaneous and systemic plasmacytosis reported in Korea have shown the typical skin manifestations on the trunk of the patients. Herein, we report on a case of cutaneous and systemic plasmacytosis and the patient presented with multiple erythematous to brownish patches on the face, neck and both axillary areas. (Korean J Dermatol 2009;47(5):558~561)
양지혜 ( Ji Hye Yang ),이덕우 ( Deok Woo Lee ),원종현 ( Chong Hyun Won ),장성은 ( Sung Eun Chang ),이미우 ( Mi Woo Lee ),강윤구 ( Yoon Koo Kang ),최지호 ( Jee Ho Choi ),문기찬 ( Kee Chan Moon ) 대한피부과학회 2010 대한피부과학회지 Vol.48 No.3
Erythrodermic mycosis fungoides (MF) denotes a condition in which erythroderma occurs in patients with otherwise typical clinical features of MF. Gemcitabine is a novel treatment regiment for MF. A 16-year-old boy presented in the hospital with skin lesions that showed generalized erythema with scaling, several plaques, and nodules with ulceration on the extremities and trunk. He was diagnosed with erythrodermic MF. His lesions did not improve with methotrexate (7.5 mg/week) and PUVA for 6 months, so his treatment regimen was changed to systemic gemcitabine therapy (1,000 mg/m2 per week). After 6 cycles of gemcitabine, his skin lesions disappeared. We report a case of erythrodermic MF treated by gemcitabine. (Korean J Dermatol 2010;48(3):232~236)
정운경 ( Woon Kyong Chung ),이덕우 ( Deok Woo Lee ),장성은 ( Sung Eun Chang ),이미우 ( Mi Woo Lee ),최지호 ( Jee Ho Choi ),문기찬 ( Kee Chan Moon ),고재경 ( Jai Kyoung Koh ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.9
Spindle cell lipoma is a benign tumor composed of ropey collagen, myxoid stroma, CD34-positive spindled cells, and mature fat. The variable proportion of these elements among different cases of the neoplasm makes diagnosis difficult. Furthermore, numerous variants have been reported, including pseudoangiomatous spindle cell lipoma, angiomatous spindle cell lipoma, fibrous spindle cell lipoma, and low-fat or fat-free spindle cell lipoma. Here we report a case of low-fat, fibrous spindle cell lipoma in which fat is noted to be present in <5% of the tumor, whereas fibrous collagenous stroma is predominant. (Korean J Dermatol 2008;46(9):1270~1274)
현실적 영상 필터링 방법을 위한 주파수 영역에서의 다각형 형태 필터의 모델링
김주오(Ju-O Kim),김지수(Ji-Su Kim),박철형(Cheol-Hyeong Park),이덕우(Deok-Woo Lee) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.3
본 논문에서는 영상신호를 필터링 하기 위해 필요한 현실적인 수학적 모델을 제시한다. 1차원 신호 뿐 아니라 2차원 또는 다차원 신호처리 및 분석에서 필터는 영상처리, 컴퓨터 비전, 패턴 인식 등의 다양한 분야에서 근본적이고 중요한 과정을 수행한다. 일반적인 신호처리에서 신호를 주파수 영역에서 해석할 경우 1차원 신호 영역에서의 이상적인 (저역통과) 필터는 직사각형 형태를 가지고 있듯이, 2차원 신호의 이상적인 필터는 원 형태를 가지고 있다. 본 논문에서는 주파수 영역에서 활용할 수 있는 실용적이고 효율적인 다각형 형태의 영상 필터 모델을 제안한다. 본 논문은 2차원 영상을 필터링 하기 위해 원형 필터를 사용하는 대신 육각형 형태의 필터를 모델링하여 적용한다. 이것은 무선 통신 시스템에서의 주파수 재사용 개념을 도입함으로서, 영상 필터링에서도 주파수 대역을 효율적으로 사용하기 위함이다. 본 논문에서 제시한 육각형태의 필터를 활용한 영상 필터링의 시뮬레이션 결과를 제시하고, 성능을 PSNR로 계산한 결과 제안한 방법이 이상적인 필터의 대안으로서 가능함을 보인다. In this paper, we propose an approach to design a practical filter and a mathematical modeling for images. In the areas of signal processing, including high-dimensional image processing, the filtering process has been fundamental and crucial in diverse practical applications such as image processing, computer vision, and pattern recognition. In general, the ideal filter is modeled as circular-shaped in the 2D frequency domain as the rectangular shape is ideal for the 1D frequency domain. This paper proposes an approach to modeling practical and efficient image filter in the 2D frequency domain. Instead of employing a circular-shaped filter, this study proposes a polygon-shaped filter inspired by the concept of a hexagon cellular system for frequency reuse in wireless communication systems. By employing the concept of frequency reuse, bandwidth efficiency is also achieved in the frequency domain. To substantiate the proposed approach, quantitative evaluation is performed using PSNR.