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서현덕 ( Hyun Deok Seo ),나찬호 ( Chan Ho Na ),정병수 ( Byoung Soo Chung ),최규철 ( Kyu Cherl Choi ),신봉석 ( Bong Seok Shin ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.4
Pyoderma gangrenosum is a painful, chronic, ulcerating skin disease associated with a wide variety of disorders, including Crohn`s disease, ulcerative colitis, and Behcet`s disease. Etiology of pyoderma gangrenosum is unknown but the lesions frequently appear at points of trauma and it is related with pathergy. We report a case of post-traumatic pyoderma gangrenosum occurring in ulcerative colitis with a review of the literature. (Korean J Dermatol 2008;46(4):487~490)
서현덕 ( Hyun Deok Seo ),정병수 ( Byoung Soo Chung ),최규철 ( Kyu Churl Choi ),신봉석 ( Bong Seok Shin ) 대한피부과학회 2009 大韓皮膚科學會誌 Vol.47 No.2
Background: Telogen effluvium (TE) is a form of nonscarring alopecia, characterized by diffuse scalp hair thinning in response to some form of physiologic stress. It is commonly described in women subsequent to childbirth. Objective: The purpose of this study was to evaluate the prevalence of TE after childbirth. Methods: Medical records from January 2006 to June 2007 of 240 postpartum patients from our obstetric department were reviewed. Telephone interviews with TE patients were conducted to investigate the initial occurrence time, restoration time, and treatment history. Results: Prevalence of TE according to parity is higher in multiparas than primiparas (p=0.026). In addition, the prevalence of TE after a cesarean section delivery is higher than that after non-surgical delivery (p=0.014). Prevalence of TE with respect to weight gain is higher in the groups displaying agreater increase in weight (p=0.014). Finally, prevalence of TE according to gestational age is higher in groups giving birth after 38 weeks gestational age (p=0.015). Conclusion: Prevalence of telogen effluvium may be associated with multiparity, cesarean section, marked weight gain, and high gestational age. (Korean J Dermatol 2009;47(2):127∼131)
Jessner`s Lymphocytic Infiltration of the Skin
신봉석 ( Bong Seok Shin ),서현덕 ( Hyun Deok Seo ),나찬호 ( Chan Ho Na ),최규철 ( Kyu Churl Choi ),정병수 ( Byoung Soo Chung ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.7
Jessner`s lymphocytic infiltration of the skin (JLIS) is a well-known but poorly understood disorder. Some doubt still exists about whether it is a distinct disease or a variant of lupus erythematosus or, less commonly, polymorphous light eruption, cutaneous lymphoid hyperplasia. An effective therapy is still unavailable for JLIS. We report a patient with JLIS which was successfully treated with dapsone and intermittent systemic glucocorticoid therapy. (Korean J Dermatol 2008;46(7):977~980)
미세 표면 구조물을 갖는 패드의 제작 및 STI CMP 특성 연구
정석훈,정재우,박기현,서현덕,박재홍,박범영,주석배,최재영,정해도,Jeong, Suk-Hoon,Jung, Jae-Woo,Park, Ki-Hyun,Seo, Heon-Deok,Park, Jae-Hong,Park, Boum-Young,Joo, Suk-Bae,Choi, Jae-Young,Jeong, Hae-Do 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.3
Chemical mechanical polishing (CMP) allows the planarization of wafers with two or more materials. There are many elements such as slurry, polishing pad, process parameters and conditioning in CMP process. Especially, polishing pad is considered as one of the most important consumables because this affects its performances such as WIWNU(within wafer non-uniformity) and MRR(material removal rate). In polishing pad, grooves and pores on its surface affect distribution of slurry, flow and profile of MRR on wafer. A subject of this investigation is to apply CMP for planarization of shallow trench isolation structure using microstructure(MS) pad. MS pad is designed to have uniform structure on its surface and manufactured by micro-molding technology. And then STI CMP performances such as pattern selectivity, erosion and comer rounding are evaluated.
문재원 ( Jae Won Moon ),나찬호 ( Chan Ho Na ),서현덕 ( Hyun Deok Seo ),최규철 ( Kyu Chul Choi ),신봉석 ( Bong Seok Shin ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.12
Liposarcomas are one of the most common soft-tissue sarcomas in adults. They usually arise in the deep soft tissues, and patients present with large painless masses. Four major types of liposarcomas are generally recognized and have epidemiologic and prognostic differences: atypical lipomatous neoplasm/well-differentiated; myxoid/round-cell; dedifferentiated; pleomorphic variants. Myxoid liposarcoma is the second most common type of liposarcoma, representing 30∼40% of all liposarcomas in the extremities. We report a case of myxoid liposarcoma in a 78-year-old man who presented with an asymptomatic, firm, deep-seated mass in the lateral aspect of his left upper arm. (Korean J Dermatol 2008;46(12):1629∼1633)