전력량계 오결선에 따른 손실 변화량 연구

윤상천(Sang-Cheon Yoon),박재희(Jae-Hee Park) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.7

자철석 혼입 모르터의 활용성 검토 연구

윤상천 ( Yoon Sang Chun ),양성철 ( Yang Sung Chul ) 한국구조물진단유지관리공학회 2012 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.16 No.2

구획화재 시 배연창 및 배연구가 화재확산지연에 미치는 영향

윤상천(Sang Chun Yoon),지남용(NamYong Jee),이충선(Chung Seon Lee) 한국생활환경학회 2014 한국생활환경학회지 Vol.21 No.3

On occurring fire of high-rise building, smoke vent window may not operate effectively depending on structural characteristics of buildings and outdoor air conditions, as noted in some literature. Therefore, in this study it reviewed the exhaust effect of ventilation system considering outdoor air conditions. Also, reviewed the influence related to the temperature changes inside compartments of ventilation system with the effective area of smoke vent window and the exhaust capacity of ventilator as variables. The fire analysis using Fire Dynamics Simulator (FDS) was conducted for this study. The result showed that the temperature rise of fire compartments can be delayed by the inflow of outdoor air and the delayed effect seems to be affected by total exhaust quantity of ventilation system.

수직 중축형 리모델링 안전진단 내구성 평가기준 합리화에 관한 연구

윤상천 ( Sang-chun Yoon ),신동철 ( Dong-cheol Shin ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 논문집 Vol.24 No.6

주택법(2014년)에 근거하여 철근콘크리트 공동주택의 리모델링 시 수직 및 세대수 증축이 가능하게 되었다. 수직증축 리모델링 가능 여부는 안전진단 기준 및 매뉴얼을 바탕으로 기울기 및 침하, 내하력, 내구성 평가 부문에 대한 평가를 통하여 판정하도록 되어 있다. 그러나 증축형 리모델링 기준 및 매뉴얼 제정 당시, 국내에서는 수직증축 리모델링 안전진단 사례가 전무하여 평가기준 등에 대한 공학적 근거 제시에 한계가 있었으며, 특히 내구성 평가 기준에 대한 합리화 및 관련 기준과의 부합을 위한 개선이 필요한 것으로 생각된다. 따라서 본 연구에서는 국내외 내구성 관련 기준을 근거로 콘크리트 탄산화, 염분함유량, 균열, 철근부식, 표면노후도의 허용치와 평가기준에 대한 검토·분석을 통하여 수직증축형 리모델링 안전진단 내구성 평가방법의 합리화 방안을 제시하였다. In 2014, The Housing Act amended to allows vertical extension and increases the units of housing (or total floor area) to site. Currently, the feasibility of performing vertical extension is evaluated based on safety diagnosis provisions and manuals with 1st investigation stage on slope, uneven settlement, load-bearing capacity, and durability. However, a need for more reasonable evaluation criteria for the investigation is still required because there had not been any other case study on the diagnosis for the vertical extension, and the engineering basis on evaluation criteria were not suggested. Accordingly, this study is intended to suggest feasible evaluation criteria on the carbonation, chloride ion contents, corrosion of reinforcements, crack and surface deterioration of concrete for durability assessment by codes and standards of domestic and foreign countries. The results of this study are expected to be beneficial for establishing more reasonable durability evaluation criteria, and in turn, more reliable assessment protocol for vertical extension.

공동주택 증축형 리모델링 안전진단 내구성 평가방법에 관한 연구

윤상천(Yoon, Sang Chun),이석호(Lee, Seok Ho) 한국콘크리트학회 2018 한국콘크리트학회 학술대회 논문집 Vol.30 No.1

고로슬래그 미분말을 함유한 고유동 모르터의 유동성상에 미치는 영향 요인에 관한 연구

김재훈,윤상천,지남용,Kim, Jae-Hun,Yoon, Sang-Chun,Jee, Nam-Yong 한국건축시공학회 2002 한국건축시공학회지 Vol.2 No.4

High fluid concrete unlike OPC concrete is made with various material, and the phase of fresh concrete is considerably different. In order to understand fluidity phase and mix properties of high fluid concrete, concrete is required to access as suspension structure which consists of aggregate and paste. The focus of this paper is to analyze the test results and quantify the effect of mix proportions of mortar and fineness modulus of sand on the properties of fresh mortar. The effect of water-binder ratio. sand-binder ration. contents of ggbs (by mass of total cementitious materials). and various contents of water reducing agent on the yield stress and plastic viscosity of the mix is studied. Based on the experimental results, the fellowing conclusions can be drawn: (1) The mixing time needed for high fluid mortar was approximately two times more than that of ordinary portland mortar. (2) The fluidity phase of mortar could be explained by yield stress of mix and the fluidity of mortar. (3) As the content of ggbs increased, yield stress of mortar was decreased and plastic viscosity of it was increased. (4) For the high fluid mortar, it was appeared that sand-binder ratio should be below 1.5.

고로슬래그미분말을 혼입한 고유동콘크리트에서 골재조합이 콘크리트 유동성상에 미치는 영향에 관한 실험 연구

김재훈,윤상천,지남용,Kim, Jae-Hun,Yoon, Sang-Chun,Jee, Nam-Yong 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.4

The purpose of study is to offer base data for high fluid concrete mix property, as grasp effect of aggregate to reach much more effect for producing high fluid concrete. For this study, there are three types of combined aggregates, river sand + river aggregate(type A), river sand + crusted aggregate(type B), washed sea sand + crushed aggregate(type C) and take a factor, water-contents, water-binder ratio and S/a. And so, we had following conclusion, resulting application-ability of high fluid mortar by K-slump tester to use a handy consistency measuring instrument. And so, we had following conclusion, resulting application-ability of high fluid concrete by K-slump tester to use a handy consistency measuring instrument. 1) In cafe of regular water binder ratio, high fluid concrete suffered much effect of combined aggregates and water binder ratio. Range of water binder ratio by combined aggregates is w/b 0.4 downward(type A and B), w/b 0.35 downward(type C). 2) Water contents to need for producing high fluid concrete is minimum 170kg/$\textrm{m}^3$ without regard to combined aggregates. 3) The effect of S/a on high fluid concrete by combined aggregates is approximately S/a 50% (type A and B), s/a 50-55% (type C). 4) Consistency measuring of high fluid concrete by K-slump tester is possible and first indication value, high fluid concrete can be produced, is 6~10.5cm.

성숙도 개념을 이용한 한중콘크리트의 양생관리 프로세스에 관한 연구

김형래(Kim Hyung-Rae),윤상천(Yoon Sang-Chun),지남용(Jee Nam-Yong) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.10

The purpose of this study is to establish a practical process model for the determination of curing conditions, such as curing temperature and curing period, needed to acquire the necessary strength as the date. And, through these investigations and theoretical considerations, rational curing method for cold weather concreting and strength management system of concrete structures would be established ultimately. <br/> As the results, for estimating the strength by the maturity using temperature history of concrete, the equivalent ages method for the calculation of concrete maturity and ACI 209 Committee equation for inferring the concrete strength was considered to be appropriate, respectively.<br/> The quality control for cold weather concreting in domestic construction site focuses on the protection of concrete from freezing at early ages. But, the existing heating method for the concrete curing should be improved, if the ultimate goal of the cold weather concreting is a reduction of construction duration.<br/> Finally, the method for the strength prediction of structural concrete and the process model for the selection of rational curing method was presented in this study.

효율적 배전용 변압기 운영방안에 대한 연구

강대근(Dea-Kuen Kang),윤상천(Sang-Chun Yoon),정종만(Jong-Man Jung) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

배전용 변압기는 일정주기로 간이(또는 중)수리가 이루어지고 있으나 현재 배전용 변압기는 매년 그수가 증가하여 08년 10월을 기준으로 주상변압기의 경우 약 190만대에 이르고 있다. 변압기 주요고장원인을 통계자료 및 Logic Tree를 분석하여 변압기 상태에 가장 많은 영향을 미치는 원인에 대하여 알 수 있었고 이를 이용하여 변압기 상태를 평가하는, 이른바 기존의 주기적인 유지 · 보수 (time-based maintenance)방식에서 설비상태기반(condition-base maintenance)유지 · 보수 그리고 예지적 유지 · 보수(predictive maintenance) 운영방식으로 전환가능한 개선안을 도출하였다. 교체대상 변압기인 노후 배전용 변압기의 효율적인 관리방안을 제시하여 설계수명까지 최대한 사용함으로서 자원을 효율적으로 활용하고 더불어 경제적인 운영을 도모할 수 있다. 이상과 같이 노후 배전용 변압기의 교체기준을 개선을 통해 변압기 운영 경제성을 높일 뿐만 아니라 환경문제에 대응할 수 있어 경영 효율화에 크게 공헌할 수 있을 것이다.

샌드위치패널 물류창고의 소화활동을 위한 유지관리 측면의 건축적 대응방안 연구

장주환(Jang Joo hwan),윤상천(Yoon Sang chun),안병국(An Byung kug) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.6

최근 샌드위치패널의 물류창고에서 화재가 빈번하게 발생하고 있으며, 화재발생시 화재하중이 크고 조기 소화활동이 어려워 인명과 물적 피해규모가 큰 것으로 조사되었다. 대형물류창고의 5년간 화재원인 조사 분석 결과, 부주의, 전기적 요인, 원인미상 순으로 나타났다. 이에 화재 시 물류창고의 인명피해 저감을 위해서는 사전 화재 안정성 측면의 평가와 소방관들이 효과적으로 진압을 위한 요소 기술과 구조물의 붕괴 전 대피를 위한 건축적 개선 방안에 대한 연구가 필요하다. 따라서 본 연구에서는 기존 샌드위치패널 물류창고의 효과적인 소화활동을 위한 유지관리 측면의 패시브 건축방재 기술과 액티브 기술을 적용한 건축적 대응방안에 대한 연구를 수행하였다. 이를 통해 샌드위치패널 물류창고의 화재안정성 조사 및 분석을 하였으며, 효과적인 소화를 위한 골든타임 확보방안과 소방관의 소화진압 장비 활용방안을 제시하였다. 또한 화재확산 방지를 위한 외벽설치 방법, Fire Blocking과 인증제품 사용, 피난시스템과 소방시설 유지관리 등 건축적 대응방안을 제안하였다. In recent, fire accidents have frequently occured in warehouses with exterior wall of sandwich panels, and higher fire loads have made fire fighting activities difficult, and it was investigated that the damage to life and property were severe. According to the analysis of bigger fire accidents in warehouses for 5 years, main causes were revealed as inobservance, electrical fire, and unknown cause. In order to reduce the damage caused by fire in the logistics warehouse, it is necessary to assess the fire safety, to develop the element technology for the suppression of fire-fighters, and to study the architectural method for the effective evacuation against the collapse of the structure. In this study, we have conducted research on architectural countermeasures with passive and active fire protection technology for the effective fire fighting activities of sandwich panel warehouse. The purpose of this study is to investigate and analyze the fire stability of the warehouse, to suggest the ways to secure golden time and to utilize equipment for effective fire fighting. In this paper, we propose an architectural countermeasures, such as the exterior wall installation method, fire blocking and certification product use, evacuation system and maintenance of fire fighting facilities to prevent fire spread.