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가용 성형한계영역을 이용한 스템핑 공정의 효율적 설계방법
차승훈(Seung-Hoon Cha),이찬주(Chan-Joo Lee),이상곤(Sang-Kon Lee),김봉환(Bong-Hwan Kim),고대철(Dae-Cheol Ko),김병민(Byung-Min Kim) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.11
In metal forming technologies, the stamping process is one of the significant manufacturing processes to produce sheet metal components. It is important to design stamping process which can produce sound products without defect such as fracture and wrinkle. The objective of this study is to propose the feasible formability diagram which denotes the safe region without fracture and wrinkle for effective design of stamping process. To determine the feasible formability diagram, FE-analyses were firstly performed for the combinations of process parameters and then the characteristic values for fracture and wrinkle were estimated from the results of FEanalyses based on forming limit diagram. The characteristic values were extended through training of the artificial neural network. The feasible formability diagram was finally determined for various combinations of process parameters. The stamping process of turret suspension to support suspension module was taken as an example to verify the effectiveness of feasible formability diagram. The results of FE-analyses for process conditions within fracture and wrinkle as well as safe regions were in good agreement with experimental ones.
한국 성인의 지단 단위(Finger-Tip Unit)와 신체 부위에 따른 임상적 응용
정상원(Sang Won Jeong),전재훈(Jae Hoon Chun),박재훈(Jae Hoon Park),차승훈(Seung Hoon Cha),박석돈(Seok Don Park) 대한피부과학회 2000 대한피부과학회지 Vol.38 No.12
Background:Dermatologic patients need advice on how much ointment or cream to apply, in particular topical corticosteroids. The instructions given to patients concerning topical therapy are frequently vague. Objective:The aims of this study are to make simple guidelines on the topical application of ointments or creams for patients, parents, doctors and nurses, and to check the accuracy of these guidelines in practice. Methods:The average height and weight according to the different age groups and sex were measured from Korean standard growth and developement chart. From this chart, their total body surface areas(BSA) were calculated using a standard nomogram. The length of the tips of their index fingers was measured; measuring from the distal skin-crease to the end of the finger. One finger-tip unit(FTU) was defined as the amount of ointment expressed from a tube nozzle with a 5 ㎜ in diameter, covering from the distal skin-crease to the tip of the palmar aspect of the index finger. The average area of abdominal skin covered by one finger-tip unit, and that of one palm were measured by computer scanner(Hurapack scanner, 4C) and image analyzed program(Image Pro. Plus V. 3.0, Micromedical). Each patient then placed his or her right hand lightly, palm side down with the fingers and thumb closed, onto Hurapack scanner 4C. A tracing of the outer edge of the hand was made from the ulnar to radial styloid by photoshop program. The outlined area and enclosed area were measured by an image analyzer. Results 1. The average length of each finger-tip was 2.48±0.2㎝ in males and 2.24±0.13㎝ in females. 2. The average weight of one FTU was 0.46±0.03g in males and 0.40±0.02g in females. 3. The average area of palm was 145±12.4㎠ in males and 115.9±10.1㎠ in females. 4. The average area of abdominal skin covered by one FTU was 278±34.4㎠; The average area was 303±24.3㎠ in males and 253±21.9㎠ in females. (Korean J Dermatol 2000;38(12):1624~1629) 5. The number of FTU of adult male required to treat various anatomical sites was : face and neck, 2.6; trunk and buttock, 10.5; arm and hand, 5; leg and foot, 10. The number of FTU of adult female was : face and neck, 2.8; trunk and buttock, 11; arm and hand, 5.5; leg and foot 11. 6. The number of FTU of children required to treat each anatomical site was variable because of differential growth according to different age. Conclusion:The concept of FTU provides convenient means of rapidly assessing the approximate amount of ointment or cream required for the treatment of patients.
정상원 ( Sang Won Jeong ),이상원 ( Sang Won Lee ),차승훈 ( Seung Hoon Cha ),박석돈 ( Seok Don Park ) 대한피부과학회 1998 대한피부과학회지 Vol.36 No.5
We describe an 18-year-old male with generalized pruritic, tense annular or polycyalic blistera on normal-appearing skin or erythematous bases. Histopathological fmdings of an iatact early blistering showed subepidermal blistering and papillary neutrophilic gnicroabscesses. A direct immunofluctescent study of a section from the skin adjacent to a lesioti revealed linear deposits of IgA at the dermoepidermal junction. There were no deposits of IgG, lgM, or C3. In 1.0M NaC1 eplit skin, IgA was found to be bound linearly on the epidermal roof. The patient respmded weIl to eteroid and dapsone therapy. (Korean J Dermatol 1998:36(5): 962-964)
융합성 망상 유두종증에서 Minocycline의 치료 효과
신성욱 ( Sung Wook Shin ),김종구 ( Jong Gu Kim ),차승훈 ( Seung Hoon Cha ),박석돈 ( Seok Don Park ) 대한피부과학회 1998 대한피부과학회지 Vol.36 No.2
Background: Confluent and reticulate papillomatosis(CRP) of Gougerot and Carteaud is an uncommon disorder of unknown cause for which a variety of treatments have been proposed. Objective : We attempted to evaluate the therapeutic effect of oral minocycline for CRP. Method: Nine patients(age range, 14 to 38; mean age, 21years) with CRP were included in this study. They took minocycline 100mg daily. The therapeutic effect was evaluated weekly by 5 scoring systems according to the percentage clearing of the skin lesion: poor (score 1), <25% clearing; fair (score 2), 26-50%; good (score 3), 51-75%; excellent (score 4), 76-95%, clear(score 5), >95%. Results: Two out of 9 patients showed complete clearing(score 5) of the skin lesions within 2 weeks. Seven patients revealed incomplete clearing(score 4) within 3 to 8 weeks. The mean scoring for 9 CRP patients was 4.2. Recurrences were noted in two patients at 24 and 26 months, respectively, but they responded to re-treatment with minocycline. The patients did not show any adverse reactions apart from two patients who developed mild pruritus. Conclusion : We recommend minocycline as the first choice of treatment for CRP because minocycline is safe, economic and effective. (Korean J Dermatol 1998;36(2): 204-209)
국방 무기체계 연구개발 사업에서 진화적 개발의 실효적 수행 방안에 관한 연구
김중명,차승훈,이혜진,유제상,최상욱,Kim, Jung Myong,Cha, Seung Hoon,Lee, Hye Jin,Yoo, Jae Sang,Choi, Sang Wook 한국시스템엔지니어링학회 2021 시스템엔지니어링학술지 Vol.17 No.1
Recent defense R&D projects have been required as weapons systems applied with advanced technology considering exports. As a result, the complexity of the applied technology increases, and the risk of system development increases. Under these circumstances, an effectives method of performing evolutionary development for economical and timely deployment is presented. To this end, we hope that this study, which proposed the maintenance of related laws and measures for realistic and active evolutionary development, will help the R&D of the weapons systems.
정상원(Sang Won Jeong),이상원(Sang Won Lee),윤녕훈(Nyung Hoon Yoon),차승훈(Seung Hoon Cha),박석돈(Seok Don Park) 대한피부과학회 2000 대한피부과학회지 Vol.38 No.2
A 40-year-old female patient, known angiocenteric T-cell lymphoma on nasal cavity, was transfered from the department of hemato-oncology for the evaluation of egg sized pinkish-yellow indurated mass with central necrotic tissue on the left medial elbow. Histopathologic findings revealed angiocentric, angioinvasive, and angiodestructive infiltrate containing atypical lymphocytes. The infiltrative cells were positivly stained with antibody to CD45RO, LCA, but not with antibody CD20. The atypical infiltrated perivascular lymphoid cells were positive to Epstein-Barr virus in situ polymerase chain reaction. She was treated with combined chemotherapy and radiation therapy, but she died due to sepsis. We herein report a rare case of angiocentric T-cell lymphoma on the nasal cavity and skin associated with Epstein-Barr virus. (Korean J Dermatol 2000;38(2):240~244)
케토프로펜 첩포제 ( 케토톱 (R) ) 에 의한 접촉 피부염
윤녕훈(Nyoung Hoon Yun),유동오(Dong O You),이상원(Sang Won Lee),박석돈(Seok Don Park),차승훈(Seung Hoon Cha) 대한피부과학회 2001 대한피부과학회지 Vol.39 No.7
Ketoprofen is an nonsteroidal anti-inflammatory drug derived from propionic acid. It has been widely used as topical preparations, as gel or patch. It has been reported that topical ketoprofen can cause contact dermatitis and photocontact dermatitis. We experienced five cases of contact dermatitis, developed after applying ketoprofen patch (Ketotop®, Pacific pharmaceutical Co., Korea) for the control of oste omuscular or joint pain. While one patient had generalized urticarial eruption, the rest of patents showed localized erythematous pruritic eczematous skin eruptions. It was verified through intradermal skin test and pin prick test that ketoprofen itself was not the causative drug for the skin eruption. Patch test excluded the possibility of allergic skin reaction to rubber compounds. It should be elucidated which compounds are allergic or toxic to the skin, contained in woven fabrics. (Korean J Dermatol 2001;39 (7): 794-797)