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강병덕,양재석,김일환,송해준,오칠환 ( Byung Duk Kang,Jae Seok Yang,Ill Hwan Kim,Hae Jun Song,Chil Hwan Oh ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.1
Reactive perforating collagenosis(RPC) is a rare perforating disorder characterized by transepithelial elimination of altered collagen. Two types of RPC occur:inherited and acquired. The acquired type arises during adult life without a familial tendency. It is accompanied by scratching and usually is associated with diabetes mellitus, chronic renal failure, lymphoma and AIDS. We report three cases of the acquired form of RPC. Pruritus was the common factor among them. In two patients, chronic renal failure and hyperthyroidism were associated with RPC. Histopathological and ultrastructural findings showed transepithelial elimination of collagen. Control of itching was helpful for clearing the lesions.(Kor J Dermatol 1997;35(1):204∼208)
강병덕 ( Byung Duk Kang ),계영철 ( Young Chul Kye ),김수남 ( Soo Nam Kim ) 대한피부과학회 1996 대한피부과학회지 Vol.34 No.2
Background: Although the clinical and histopathological findings of pityriasis lichenoides(PL) are well known, there are few vailable data in Korea. Objective : The purpose of this study was to evaluate the clinical and histopathologic features of pityriasis lichenoides(PL). Method: The clinical charts, photographies and skin biopsy slides of 86 patients who had been clinically diagnosed as PL at the initial visit were reviewed. Finally 49 patients were diagnosed as PL. They were classified into 5 groups(PLA, PLA>C, PLA=C, PLC>A, and PLC) according to the distribution ratio of acute and chronic lesions, and into 3 groups(diffuse, central, and pheripheral) by Gelmetti's method. And then the evaluation of age at onset, sex distribution, form and distribution of skin lesions, associated symptoms, clinical course, response to the treatment, and histopathologic features was conducted. Results 1. PL was more common in young adults(mean age 26.6 years) and males(male : female 2.5: 1). The trunk and proximal extremities were the predilection sites but also the acral(1) and facial(2) areas were involved. There were no specific symptoms in most cases, but, mild itching sensations in 7 cases and fever in i case. 2. The clinical course in 22 followed-up patients was 25.05+37.51months. The acute forms (PLA, PLA>C, and PLA=C) tended to run a fairly longer course than the chronic forms(PLC >A and PLC) but the statistical significance of these difference was low. 3. Most patients were improved by oral tetracycline, topical steroid application, and UVB therapy within the range of a few weeks to several months. But in 2 cases the lesions lasted over a year. 4. The histopathologic study of both PLA and PLC revealed the perivascular lymphocytic infiltration, obscuring of the dermo-epidermal junction by lymphocytic infiltration and exocytosis. In addition to the deeper and severe lymphocytic infiltration, the findings of dyskeratosis, epidermal necrosis, intraepidermal RBC trapping, RBC extravasation in dermis and papillary dermal edema were more prominent in PLA than PLC. 5. The diseases which were chnically confused with PL included the subacute or chronic dermatitis, insect bite, drug eruption, folliculitis, pityriasis rosea, etc. Conclusion : PL is an epidermal and dermal inflammatory condition that has a benign and self limited course in most cases. The classification according to the distribution ratio of acute and chronic lesions seems more useful in the evaluation of clinical type and course. (Kor J Dermatol 1996;34(2): 185-193)
이종결합 고속회전 발사 탄의 비행 안정성에 결합력이 미치는 영향성 분석
이상봉 ( Lee Sang-bong ),최낙선 ( Choi Nak-sun ),이종현 ( Lee Jong-hyeon ),김상민 ( Kim Sang-min ),강병덕 ( Kang Byung-duk ) 한국품질경영학회 2021 품질경영학회지 Vol.49 No.3
Purpose: We sought to understand why a high-speed rotating projectile featuring a fuze-and-body assembly sometimes exhibited airburst, and we intended to improve the flight stability by eliminating airburst. Methods: We performed characteristic factor analysis, structural mechanics modeling, and dynamic modeling and simulation; and we scheduled firing tests to discover the cause of airburst. We used a step-by-step procedure to analyze the reliability function for selecting the bonding force standard that prevents airburst. Results: The 00MM high-speed rotating projectile features a fuze bonded to a body assembly; the bonding sometimes can break on firing. The resulting contact force, vibration and roll damping during flight generated yaw. Flight became unstable; fuze operation triggered an airburst. Our reliability test improved the bonding force standard (the force was increased). When the bonding force was at least the minimum required, a firing test revealed that airburst/flight instability disappeared. Conclusion: Analysis and identification of the causes of flight instability and airburst render military training safer and enhance combat power. Ammunition must perform as designed. Our method can be used to set standards that improve the performances of similar types of ammunition.