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박동재(Dong-Jae Park),성재득(Jae-Deuk Sung),이동수(Dong-Su Lee),노영주(Young J. Rho),최진구(Jin-Goo Choi),한익주(Ik-Joo Han) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.2D
날이 갈수록 네트워크와 클라이언트 컴퓨터의 성능이 계속 진보되고 있다. 고성능 클라이언트의 증가함에 따라 실시간으로 고품질의 동영상 서비스를 대중적으로 요구되고 있고, 서비스 제공자는 그에 맞는 고비용의 하드웨어 장비를 구축해야 하는 어려움에 직면하고 있다. 하나의 서버에 수백, 수천 개의 클라이언트를 수용할 수 있도록 설계를 하는 경우에, 그 비용은 늘어나고, 시간과 노력 또한 많이 들게 된다. 그럼에도 불구하고, 클라이언트의 수요가 늘어남에 따라 서버의 부담은 급격히 늘어나게 되어, 서비스의 양과 질이 제한을 받게 된다. 우리는 이러한 제한을 극복하고, 서비스 제공자의 부담을 줄이고자 분산 클러스터링이라는 개념을 사용하였다. 이 방법으로 우리는 서버의 부담을 클라이언트에 나누어 주어, 서비스를 받고 있는 각 클라이언트도 서버의 기능을 가지게 하였다. 클라이언트가 다른 클라이언트에게 스트리밍 서비스를 가능하도록 한 것이다. 클라이언트에게 서버의 기능이 주어져, 스트리밍 서버의 부담은 클라이언트 수에 영향을 받지 않게 된다. 그로 인해 서버의 비용 및 장비 면에서 이익이 기대되는 연구를 수행하였다.
박동재 ( Dong Jae Park ),오병민 ( Byung Min Oh ),이석종 ( Seok Jong Lee ),나건연 ( Gun Yeon Na ),김도원 ( Do Won Kim ),정상립 ( Sang Lip Chung ),곽은경 ( Eun Kyung Kwak ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.4
Neuroendocrine carcinoma is known to have features of neuroendocrine and epithelial differentiation through immunochemical and biochemical investigation and Merkel cell carcinoma is a rare primary malignancy of the skin belonging to the broad spectrum of tumors of the neuroendocrine system. Small cell carcinoma of uterine cervix, also a kind of neuroenodcrine carcinoma, is rarely reported and it is much more exceptional in the world that cervical carcinoma metastases to distant skin. Further more this may be the first case of a uterine neuroendocrine carcinoma metastasizing to the skin in Korean medical literature. We report a case of 74-year-old woman who presented with a somewhat fixed subcutaneous nodule measuring 2.5 ㎝ × 0.8 ㎝ on the left side of forehead. A biopsy of the nodule revealed a poorly differentiated carcinoma under the muscle without involvement of upper structures and it showed neuroendocrine differentiation by immunohistologic studies. Before appearing as cutaneous manifestation 2 months ago, she had showed a history of abnormal vaginal bleeding and diagnosed as a cervical neuroendocrine carcinoma, especially small cell carcinoma histologically. (Korean J Dermatol 2003;41(4) : 484-488)
면도절제술 후 귀걸이 압박요법으로 자가 치료한 귓불 켈로이드 4예
박동재 ( Dong Jae Park ),차영창 ( Young Chang Cha ),이석종 ( Seok Jong Lee ),나건연 ( Gun Yoen Na ),김도원 ( Do Won Kim ),정상립 ( Sang Lip Chung ) 대한피부과학회 2002 대한피부과학회지 Vol.40 No.11
Keloid is a benign proliferative growth of dermal collagen which extends beyond the original wound. Although there are several available methods of treatment including intralesional corticosteroid injection, cryotherapy, surgical excision, laser therapy, pressure, radiotherapy, interferon-α injection and so on, no effective modality to prevent the recurrence of keloids may be present. We have done shaving excision of keloids on the earlobes of 4 patients and then recommended earring made to order for home compression over 4∼5 months therapy with no recurrence for 1∼3 years. It is suggested that compression therapy with earring following shaving excision may be proven to be not only a simple but effective method for prevention of recurrence after removal of keloid on the earlobe.
백반증 환자에서 각질형성세포의 산화성 스트레스에 대한 생존률의 감소
박동재 ( Dong Jae Park ),나건영 ( Gun Yeon Na ),이석종 ( Seok Jong Lee ),김도원 ( Do Won Kim ),정상립 ( Sang Lip Chung ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.5
N/A Background : Vitiligo, a disease presenting as white patches on the skin, is caused by selective destruction of melanocytes, which are completely absent in established lesions. There are many theories about the etiology of vitiligo including the self-destruct, biochemical, neural, autoimmune and genetic hypotheses. Oxidative stress has been implicated in vitiligo as a causative factor. Objective : To examine the susceptibility of vitiligo keratinocytes to external oxidative stress, H_2O_2, we compared survival rates in cultured keratinocytes according to the different concentration and exposure time of H_2O_2. Methods : Keratinocytes were prepared from normal control volunteer, and the center of lesion and non-lesions skin of vitiligo patients. It was evaluated in cultures at the second and third passages. And, keratinocytes were exposed to various concentrations of hydrogen peroxide (H_2O_2) for10, 20 and 40 minutes. Finally, the 96 wells plate containing cells were performed MTT assay. Results : Compared to normal keratinocytes, vitiligo keratinocytes, both non-lesional and lesional, showed markedly lower survival rate. At the concentration of 0.01, 0.1 and 1 mM H_2O_2, survival rates did not significantly affect viability of keratinocytes after neither exposure times. On the contrary, vitiligo keratinocytes, both non-lesional and lesional, were more susceptible to the toxic effect of H_2O_2 after the Period of exposure at concentration of 10mM H_2O_2 compared with normal keratinocytes. The survival rate of at concentration of 10mM H_2O_2 inversely correlated with the exposure period in all experiments. Conclusions : Our results demonstrate the presence of an imbalance in the anti-oxidant system in vitiligo keratinocytes and provide further support for oxidative damage as a pathogenic event in vitiligo. (Korean J Dermatol 2003;41(5) : 592~596)
Arthroscopic Shaver를 이용한 지방종의 수술적 치료
박동재 ( Park Dong Jae ),박지영 ( Park Ji Yeong ),이석종 ( Lee Seog Jong ),나건연 ( Na Geon Yeon ),김도원 ( Kim Do Won ),정상립 ( Jeong Sang Lib ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.10
Lipoma is one of the most common benign tumors of soft tissue which tends to be left untreated due to unremarkable clinical features and its property of slow growth. It comes to clinical attention only when it causes concern of malignancy because of inordinate size or is perceived as faults in need of cosmetic removal and consequently the incision line is, frequently long and may result in high risk of intra- and postoperative complications such as hematoma and hypertropic scars. So it requires cosmetically acceptable and convenient methods for treatment of lipoma, especially located in the exposed area. The liposuction was tried to get less complications and smaller incision line. But for deep seated variants of lipoma they tend to be less well-circumscribed and often have thick fibrous septa around the lipoma, simple liposuction showed some limitations. So we tried the new liposuction method using arthroscopic shaver for 5 patients having lipomas larger than 5 cm in diameter. The surgery was performed with arthroscopic shaver system equipped with a motorized blade rotating in the suction cannula and emulsifying the lipoma tissue for easy aspiration. The aspirated material was collected and examined histopathologically to rule out the evidence of malignancy. Lipomas were removed completely without any remarkable complications, and no recurrence was seen till three years after surgery. The new method was easier to operate and took less operation time and left only small incision line.(Korean J Dermaton 2003;41(10) : 1347~1350)
박동재 ( Park Dong Jae ),박지영 ( Park Ji Yeong ),이석종 ( Lee Seog Jong ),김도원 ( Kim Do Won ),정상립 ( Jeong Sang Lib ),김선주 ( Kim Seon Ju ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.9
BCG(Bacillus Calmette-Guerin) is a vaccine from living attenuated Mycobacterium bovis which produces resistance to tuberculous infection. It induces specific and nonspecific dermatologic complications on the vaccination site or out of the site. The specif
절제술과 PUVA요법으로 병합 치료한 종양기 균상 식육종
박지영 ( Park Ji Yeong ),박동재 ( Park Dong Jae ),이석종 ( Lee Seog Jong ),나건연 ( Na Geon Yeon ),정상립 ( Jeong Sang Lib ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.11
This is a case of mycosis fungoides (MF) in a 60-year-old woman who showed a solitary painful tumor on the left thigh. Two years ago, she was diagnosed with MF for several scaly patches on trunk and thigh and was treated with PUVA therapy. After 8 months, the patch lesion almost disappeared and she stopped PUVA therapy. One year later, she revisited hospital with 3 × 3 cm sized painful tumor on left thigh which had developed for about 4 weeks. Histopathological examination of the tumor showed diffuse infiltration of atypical lymphocytes in the dermis, consistent with tumor stage MF. There was no systemic involvement. We removed tumor by surgical excision and started PUVA therapy instead of staning systemic chemotherapy or radiotherapy immediately. Until now, tumor has not recurred and she has been managed as patch/plaque stage for 12 months. We thought that aggressive treatment methods could be delayed by surgical excision of tumor in tumor stage MF. (Korean J Dermatol 2003;41(11) : 1508∼1512)