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.

급수전개된 basis를 갖는 모멘트방법에 의한 파수영역의 역산란 방법

최현철(Hyun-Chul Choi),김세윤(Se-Yun Kim),나정웅(Jung-Woong Ra) 대한전기학회 1988 대한전기학회 학술대회 논문집 Vol.1988 No.7

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)

영상분석법을 이용한 노화에 따른 피부주름의 변화에 대한 연구

최현철,오칠환 ( Hyun Chul Choi,Chil Hwan Oh ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.2

Background: The confgurations of the skin surface, as characterized by surface furrows and plateaux, are known to change with ageing. There are many parameters to analyze the effects of ageing processes on the surface configuration. However, there are contradictory results among the authors. Objective : The purpose of this study was to compare the sensitivity of various parameters being described in other reports with our new parameters used in evaluating the changes of the skin surface in the agein processes. Methods : 112 healthy Korean males in 4 age groups participated in this study. Silicon skin replicas were taken from medial and lateral aspects of the forearm. Images of the skin replicas were analyzed by means of a digital image processing system(AIC, GA). Most parameters were calculated and measured in the primary skin axis. Image analyses were porformed by 3 different processes i.e., morphometry, densitometry(optical profilometry), and histograms. Results.In Morphometry, the furrow count in the vertical section(VFC), the coefficient of the developed skin surface(CDSS) and mean width at maximal interception(MWMI) showed a tendencies to decrease with ageing.Irregularity of shadow shape(ISS) showed a tendency to increase with ageing. In Densitometry, the mean surface roughness(Ra) and mean depth of roughness(Rz) showed a tendency to increase with ageing. On histogram analysis, skewness was decreased with ageing but kurtosis did not show any significant changes. Conclusion :Ra, Rz, and ISS have shown a tendency to increase in the ageing processes(p<0. 05). VFC, CDSS, MWMI and skewness showed tendencies to decrease with ageing but the results were not statistically significant. The different results between morphometry and densitometry are likely to be due to increrr ent angles in the skin furrows with ageing. (Kor J Dermatol 1997;35(2): 292-302)

2D+3D Active Appearance Model을 이용한 운전자 응시 영역 추정

최현철(Hyun-Chul Choi),김삼용(Sam-Yong Kim),오상훈(Sang-Hoon Oh),오세영(Se-Young Oh),원웅재(Woong-Jae Won) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

This paper proposes the use of active appearance model (AAM) to track the driver's gazing direction and estimate the gazing region on the front of the driver's seat for driver assistance system based on vision in vehicles. Many face tracking algorithms have been developed and broadly used as one of the methods for human machine interface. Among them, 2D+3D active appearance model is very robust 3D face tracking technique. This technique gives all the information for face which includes the size, position and pose of face features, i.e., eye, mouth, nose. In our proposed system, 3D mesh and its alignment for the tracking face are obtained from the procedure of AAM ftting. The gazing direction is assumed as the front of the tracked face. This gazing direction is used to estimate the gazing region on the front of the driver's seat which is divided into four regions, i.e., front window, left, right side mirror, and instrument cluster. Experimental result shows that the performance of our proposed method is good in estimating driver's gazing region.

공동주거의 커뮤니티 공간 활용에 관한 연구 -소규모 계획공동체 마을 사례를 중심으로-

최현철 ( Hyun Chul Choi ),유진형 ( Jin Hyung Yoo ),김철중 ( Cheol Joong Kim ) 한국공간디자인학회 2014 한국공간디자인학회논문집 Vol.9 No.4

(연구배경 및 목적)도시의 팽창으로 주거공간이 경제성, 기능성 합리성 등을 이유로 고밀도 수직화되고 공유공간이 최소화 되어 이웃 간 커뮤니티의 단절로 다양한 사회문제들이 발생하고 있다. 이에 인간 중심의 커뮤니티가 가능한 모델을 찾고 최근 삶의 질을 중요시 하는 주거 패러다임의 시대적 흐름에 대응한다. (연구방법)먼저 공동주거 공간의 공간적 분류와 범위 그리고 개인과 개인의 소통의 사회적 거리를 알아보고 커뮤니티 형성의 원칙을 사례에 대입하여 분석하여 장단점과 한계점을 도출하여 이를 바탕으로 공동주거 공간에서 커뮤니티 활성화에 관한 방향성을 제시하고자 한다.(결론)연구결과 커뮤니티 형성이 용이하기 위해서는 공간구조가 수평적 구조로 이루어져야하며 마을 내부에서 자연스러운 만남이 이루어질 수 있도록 적절한 결절부의 배치가 필요하며 공용공간이 확장되면서 오히려 개인의 사적공간이 공적공간과 명확히 분리되어야 한다. (Background and Purpose) Various social problems arise from high-density and vertical residential space, such as economic issues, functionality, and rationality in the wake of urban expansion and disappearance of community caused by diminished shared space. In this light, I researched a model that enables a sense of human community and responds to the current housing paradigm that values quality of life. (Method)First, I determined how to classify collective housing by type of space, scope, and social communication distance between individuals. Then, by applying the principles of community formation to actual cases, I performed an analysis to come up with advantages, disadvantages, and limitations. Accordingly, I am proposing a direction for revitalizing a sense of community within a collective housing space. (Results)Spatial structure should be horizontal for community formation, and proper placement of the node area is needed for natural meeting places in a town. As common use space has expanded, private space and common space should be clearly allocated.

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)

Blossom

최현철 ( Choi Hyun Chul ) 한국기초조형학회 2018 한국기초조형학회 작품집 Vol.2018 No.2

연성 막구조의 파라메트릭 설계 시스템 개발

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.

효율적인 구조물 점검을 위한 스마트글라스 개발 연구

최현철(Choi, Hyun Chul),민경준(Min, Kyong Jun),고준영(Ko, Junyoung) 대한토목학회 2020 대한토목학회 학술대회 Vol.2020 No.10