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- 저자 : Heung Ryeol Choi (검색결과 23 건)
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최홍렬(Heung Ryeol Choi),김명남(Myung Nam Kim),홍창권(Chang Kwun Hong),노병인(Byung In Ro) 대한피부과학회 1993 대한피부과학회지 Vol.31 No.3
Background : Alopecia totalis and alopecia universalis are uncomman and developed from 5-10% of the patients with alopecia areata. Objective : The authors perfcirmed a study for clinical obervations and the effects of treatments of alopecia totalis and alopecia universalis in order that this study may cointribute to further studies and treatments of them. Methods : The author performed a clinical study of 42 patients with alopecia totalis and alopecia universalis retrospectively in order to evaluate the clinical manifestation. and the effects of treatments from January 1984 to March 1992 at the department of Dermatology, College of Medicine, Chung Ang University. Results : 1. The incidence of alopecia totalis and alopecia universalis was 6.7% (42/623) among the alopecia patients who were occtipied 1.4% (623/44,839) among the all new dermatologic out patients. 2. The age distributions at the onset of disease showed a peak incidenced an age of less than 15 years (52.4%, 22/42) and the average age was 19.7 years. 3. The laboratory fi ndings showed decreased total T cell count in 1 case(1/10), inversed T/T ratio in 6 cases(6/10), poisitive anti-thyroglobulin anti-body in 3 cases(3/11), and abnormal serum levels of testosterone, esradiol and progesterone in 5 cases(5/22), 2 cases(2/14) and 8 cases(8/13), respectively. 4. The effects in the group treated with topical immunotherapy with DPCP(2,3-diphenylcyclopropenone) or DI CB(2,4-dinitrochlorobenzene) revealed no significant difference from those in the group treated with an intralesional injection of triamcinolone acetonide. 5. The response rates to treatment were make ily higher in the patients with alopecia totalis than alopecia uriiversalis, in cases where the duration of disease was less than 5 years, and in the patients associated with psychologic stress. Conclusion : These results suggested that alopecia totalis and alopepia aniversalis frequently occur in children, and some of them we eassociated with cell mediated immunity defects, autoantibody and endocrine factors. The patients with alopecia totalis, with short duration if disease and associated with emotional stress showed better therapeutic responses. (Kor J Dermatol 1993; 31(3): 341-348)
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최흥렬(Heung Ryeol Choi),전태진(Tae Jin Chun),서성준(Seong Jun Seo),홍창권(Chang Kwun Hong),노병인(Byung In Ro) 대한피부과학회 1992 대한피부과학회지 Vol.30 No.2
Osteoma cutis is a primary cutaneous ossification, which has no preceding trauma or skin disease and no evidence of Albrights hereditary osteodystrophy n the patient or his family. The lesion appears as hard, round to irregular, sharply defined tumor of varying size within the skin or subcutis, and color ranges from flesh-colored to purple or brown. We report herein a case of osteoma cutis in a 32-year-old female, who had a 1 x 1cm sized, asymptomatic, round, flesh colored, hard nodule on the right side of her forehead for 5 years. Histopathologic examination showed mature bone with many ostocytes, osteoblasts, cement lines and Haversian canals in the dermis. (Kor J Dermatol 1992;30(2): 249-252)
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Choi, Jae-Hyuk,Jang, Jinhyeok,Shim, Wonbo,Cho, Jeong-Min,Yoon, Sang-Jae,Choi, Chi-Hoon,Han, Heung Nam,Yu, Woong-Ryeol Elsevier 2019 Composite Structures Vol.229 No.-
<P><B>Abstract</B></P> <P>Accurate in-plane shear properties are essential to simulate the mechanical behavior of fiber-reinforced laminated composites. Herein, a digital image correlation technique was used to analyze unidirectional carbon fiber-reinforced composites by three shear-test methods (±45° in-plane, Iosipescu, and V-notched rail shear tests), focusing on the uniformity of shear deformation during each test. The V-notched rail shear test imposed the most uniform shear deformation. This test, however, still imposed non-uniformity around the deformation regime for the in-plane shear modulus calculation, which needed to be accommodated. The non-uniformity was virtually characterized by a combination of various material properties using finite-element analysis. A universal correction factor of 0.925 resolved the non-uniformity involved in the V-notched rail shear test. This enabled the in-plane shear modulus of unidirectional carbon fiber- or glass fiber-reinforced composites to be accurately determined.</P>
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