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노인 인구군에서의 피부질환 분포 , 특성 및 피부관리에 대한 역학적 연구
최현철(Hyun Chul Choi),오칠환(Chil Hwan Oh) 대한피부과학회 1993 대한피부과학회지 Vol.31 No.4
Background : With the development of medical science and technology, the proprotion of the aged has been significantly increasecl. Therefore it needs to be studied the fuadamental epidemiologic survey of dermatologic diseases and akin care in the elderly. Object : Our purpose was to provide clinically relevant data regaring both dermatologic diseases and skin care in the aged population. Methods : Total 172 volunteers aged 51 to 90 were enrolled in a study of 32-item questionnaire and total cutaneous examination. Results : The sex ratio of male to female of 172 elderly volunteers as 1:1.4 and population of 7th and 8th decades occupied 76.5% with their mean age 74.4. The dermatologic findings which showed higher incidence in this study were seborrheic keratosis, senile lentigines, xerosis, cherry angioma, and generalized pruritus. Through the interviews of 172 elderly, the mot fequent dermatologic complaint was generalized pruritus. As the mean age of the population increasec, the number of the population showing xerosis and complaing of pruritus was elevated(r=0.976. 0.917 respectively). And there was a significant stastical correlation between the finding of xerosis and the the presence of pruritus(P<0.005). Conclusion : This study suggests that dermatologic problems in the elilerly are very common ancl further dermatologic studies including substantial medical care will be needed. (Kor J Dermatol 1993;31(4):459-464)
아토피성 질환에서의 피부단자시험 성적 및 혈청 IgE , RAST에 관한 연구
최현철(Hyun Chul Choi),계영철(Young Chul Kye),문기찬(Kee Chan Moon),김수남(Soo Nam Kim) 대한피부과학회 1992 대한피부과학회지 Vol.30 No.5
This study was done for the evaluation of correlation among skin test reactivity, total serum IgE and RAST level in 202 atopic disease patients, who weie composed of 165 patients with allergic rhinitis, 22 patients with bronchial asthma, 11 patients with urticaria and 4 patients with atopic dermetitis. The results were as follows: 1. The sex ratio of male to female of 202 pat,ients with atopic disease was 1.3:1(114:88) and patients with age grciup of 2nd and 3rd decades occupied 64.9%. 2. The positive reactivity of the skin scratch test in general was 62.9%. The positive ratio was highest in 2nd and 3rd decades, 76.5% and 63.8% respectirely. The positive ratio was decreased as the age of patients increased. 3. The individual allergens which showed higher positive reaction in skin scratch test were D. farinae, house dust, cat hair, cockroach and Trichophyton ii descending order. In group allergens, the house dust groups consisted 45.5% of positiv. reaction of total number of the positive allergens. The positive ratio of aeroallergen was 84.5% whereas that of foods was only 11.5%. 4. The positive ratio of house dust group was 45.0% of total patients. 5. 41.1% of patients showed positive reactivity to two or more allegens while 21.8% was positive to single allergen. The most frequent combinations were 2 to 4 allergens(95.2%). 6. The mean of total serum IgE level in 63 patients who were poitiie skin scratch test was 470.5 IU/ml. 81.0% of these patients showed high serum IgE level. 7. As the positive reactivity of skin scratch test was increased, the mean level of total serum IgE was elevated(r=0.919). 8. A highly significant correlation was existed between the mear size of D. farinae scratch test reactions and the level of specific IgE to D. farinae(r=0.977). (Kor J Dermatol 1992;30(5):633-643)
고객 및 근로자 안전을 위한 교면포장공사 교통차단 최적화방안
최현철 ( Choi Hyun-chul ),고준영 ( Ko Jun-young ) 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.26 No.2
구조물의 유지관리단계에서 보수보강 작업시 교통차단은 필수불가결한 방법이다. 하지만, 이로 인해 발생되는 작업장 안전사고는 해가 갈수록 증가추세에 있으며, 관련법률(중처법 등)도 강화되고 있는 실정이다. 각 노선의 교통량 등 노선의 특성을 바탕으로 관련기관과의 지속적인 협의·고속도로 이용객 및 연접주민들의 불편을 최소화 하기 위한 홍보 등을 통해 수도권 제1순환선 부천고가교 교면포장 교통차단 방식【장수IC~시흥IC : (판교방향) 본선 야간 전면차단, (일산방향) 본선 진입연결로 전면차단】을 개선하였다. 이로써 작업장 안전사고를 제로화 하고, 시설물 품질관리에도 크게 기여하였다.
최현철 ( Choi Hyun-chul ),송창준 ( Song Chang-jun ),민경준 ( Min Keong-jun ),민경민 ( Min Kyung Min ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.2
고속도로 교면포장 등 유지보수공사에 필요한 교통차단 최적화 방안(수도권 제1순환선 장수IC 판교방향 : 본선 야간 전면차단, 일산방향 : 본선진입 연결로 야간 전면차단)을 도출·적용함으로써, 교통사고에 따른 작업장 안전사고 및 지·정체 민원발생 Zero화 달성, 교통차단구간내 통합작업 시행으로 작업일수 최대 32일 단축, 고속도로 교통차단비용 및 편익비용 6억원 절감, 고속도로 유지보수공사의 품질관리 극대화를 실현하였다.
Recurrent Infantile Digital Fibroma
최현철(Hyun Chul Choi),계영철(Young Chul Kye),오칠환(Chil Whan Oh) 대한피부과학회 1992 대한피부과학회지 Vol.30 No.5
Recurrent infantile digital fibroma is a peculiar fibrous tumiir that may be single or multiple on fingers and toes of infants and children. We report a 5-year-old gril with recurrent infantile digital fiber oma which was recurrent on the left 5th toe. The lesion had noted at the age of 6 months. and was excised surgically when the child was 3 year old. 2 years after operation, the lesion was recurred in operation site. Microscopically, nodular fibrous mass is attached to flattened,pidermis. The underlying nodule is composed of proliferating fibroblasts surrounded by derse collagenous tissue. We could find eosinophilic inclusion bodies in the cytoplasm of fibro ilast. It was stained pink with H&E, bright red with Massons trichrome and purple with PTAH. (Kor J Derrnatol 1992;30(5):743-746)
최현철,이시은,김치경,Choi, Hyun-chul,Lee, Si Eun,Kim, Chee Kyeong 한국공간구조학회 2016 한국공간구조학회지 Vol.16 No.4
The objective of this research is to development of a parametric design system for membrane structures. The parametric design platform for the spatial structures has been designed and implemented. Rhino3D is used as a 3D graphic kernel and Grasshopper is introduced as a parametric modeling engine. Modeling components such as structural members, loading conditions, and support conditions are developed for structural modeling of the spatial structures. The interface module with commercial structural analysis programs is implemented. An iterative generation algorithm for design alternatives is a part of the design platform. This paper also proposes a design approach for the parametric design of Spoke Wheel membrane structures. A parametric modeling component is designed and implemented. SOFiSTik is examined to interact with the design platform as the structural analysis module. The application of the developed interface is to design optimally Spoke Wheel Shaped Ductile Membrane Structure using parametric design. It is possible to obtain objective shape by controlling the parameter using a parametric modeling designed for shape finding of spoke wheel shaped ductile membrane structure. Recently, looking at the present Construction Trends, It has increased the demand of the large spatial structure. But, It requires a lot of time for Modeling design and the Structural analysis. Finally an optimization process for membrane structures is proposed.
구조물 점검용 스마트글라스 개발 및 도입을 통한 효율적이고 안전한 점검체계 구축
최현철 ( Choi Hyun Chul ),진규동 ( Jin Gyu Dong ),곽석환 ( Gwak Seok Hwan ),민경준 ( Min Keong Jun ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
한국도로공사는 1969년 설립 이래 고속도로 이용고객의 안전성 확보를 위해 구조물(교량 및 터널)의 안전점검을 시행중이다. 이와 관련하여 구조물 수량이 증가, 노후화 진행 등에 따른 점검업무량이 과다해 지고 있으며 이미 점검업무를 위한 필요인원이 업무담당자 현원을 초과한 상태이다. 이를 개선하기 위하여 “ex 스마트글라스”는 점검효율화 장비로서 온라인망을 구축하여 기존 정기안전점검 업무의 76%를 개선할 수 있을 것으로 예상된다.