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Chair`s Lecture : EBV associated hydroa vacciniforme-like eruption
조광현 ( Kwang Hyun Cho ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.2
Hydroa vacciniforme (HV) is a rare self-limiting disease developing in childhood. It is characterized by vesicles and crust formation on the skin after sun exposure. Recently, cases with HV-like eruptions and severe systemic symptoms have been described in Asia and Latin America. It had been regarded as a different entity from typical HV. But latent Epstein-Barr virus (EBV) infection have also been detected in the patients with typical HV and the possibility has been suggested that typical HV and atypical HV are variants with the same disease spectrum of EBV-associated lymphoproliferative disorders, which ranges from typical HV as a benign pole to severe HV progressing to hematologic malignancy as a malignant pole. Chronic active Epstein-Barr virus infection (CAEBV) is an atypical illness associated with serologic evidence of persistent EBV infection. The extremely high levels of EBVmeasured in affected tissue or peripheral blood are the most recently proposed diagnostic criteria. I also found EBV associated HV-like eruption in the patients with CAEBV. During last 25 years, I have experienced more than 20 patients with EBV associated HV-like eruption. In this presentation, I will talk about various clinical features of the patients with EBV associated HV-like eruption that I have experienced.
통신방송 융합형 개인 맞춤형 방송 서비스를 지원하는 IPMG(IP Media Gateway) 구현
조광현(Kwang-hyun Cho),조력연(Yok-yon Cho),이종혁(Jong-hyuk Lee),김현철(Hyun-cheol Kim),안광용(Kwang-yong Ahn) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
In order to activate the digital broadcasting in Korea, the analog broadcasting will have been closed down until 2012. Recently IPTV(Internet Protocol TV) thorough internet has been regarded as the fourth media following the terrestrial, satellite, and cable for the digital broad casting. And it has been the important medium for the communication and broadcasting system. However It is not easy to replace the entire broadcasting system with the digital - type broadcasting system. For the digital broadcasting, we should replace all TV sets, install the settop-boxes to receive the various IP media, solve problems about time delaying when changing channels, and support communication and broadcasting consolidation service for such as PVR and Network CCTV. IPMG is the digital converter that is able to solve these problems.
조광현 ( Kwang Hyun Cho ),이미경 ( Mi Kyung Lee ),조성진 ( Sung Jin Jo ),김규한 ( Kyu Han Kim ),박경찬 ( Kyoung Chan Park ),은희철 ( Hee Chul Eun ),정진호 ( Jin Ho Chung ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.6
N/A Background : In white people, a distinction between intrinsic aging and photoaging has been well documented in histologic studies. However, no histological studies to date have attempted to announce morphological changes with photoaged skin of Koreans. Objective : Our purpose was to compare the histologic change with advancing age between exposed skin and nonexposed skin of Koreans. Methods : Twenty-one male volunteers between 20 and 80 years of age were recruited. The histochemical and immunhistochemical studies were performed with the skin obtained from face and buttock. Results : 1. With advancing age, there was a decreasing tendency in the epidermal thickness. However, there was no difference between exposed skin and non-exposed skin. 2. Density of dopa-positive melanocytes was much higher in the face than in the buttock at all ages. Decline of melanocyte density with advancing age is not prominent in the facial skin. 3. In the facial skin, accumulation of thickened degraded elastic fibers and a decrease in collagen fibers are evident with advancing age. In the facial skin, increase of acid mucopolysaccharides is also found with advancing age. Conclusion : Koreans, the histologic changes in the skin with photoaging are distinct from those in the skin with intrinsic aging. (Korean J Dermatol 2003;41(6) : 754~760)
조광현(Kwang Hyun Cho),이유신(Yoo Shin Lee),함의근(Eui Keun Ham) 대한피부과학회 1985 大韓皮膚科學會誌 Vol.23 No.2
A statistical survey was made on 737 cases of cutaneous benign tumors that visited the Department of Dermatology at Seoul National University Hospital during a 11-year period from 1973 to 1983. The results were summarized as follows: 1) There were 329 cases of male(44. 6%) and 408 cases of female(55. 4%). The ratio of male to female was 1: l. 24. 2) Most patients with cutaneous benign tumors belonged to age ranged from 10 to 39 with the highest incidence in the 3rd decade. 3) According to Levers classification, 737 cases of cutaneous benign tumors were divided into following 6 groups: tumors and cysts of the epidermis(252 cases, 34, 2 tumors of the epidermal appendages(125 cases, 17.0%), tumors of fibrous tissue(98 cases, 13.3%), tumors of vascular tissue(158 cases, 21.4%), turnors of farty, muscular and osseus tissue(37 cases 5.0%), tumors of neural tissue(67 cases, 9. 1 %). 4) The distribution of the frequently observed cutaneous benign tumors was as fo]lows: epidermal cyst(12. 1%), nevus flammeus(11. 4%), neurofibroma(9, l%), linear epidermal nevus(7. 9%), syringoma(6, 6%), seborrheic keratosis(7. 9%.). nevus sebaceus(6. 0%), dermatofibroma(5. 8%), steatocystoma multiplex(4. 1%,), tuberous sclerosis(2. 8% ), granuloma pyogenicurn(2. 8%).