공동주택 프로젝트의 건설사별 공기경쟁력 비교분석

류한국(Ryu Han-Guk),손보식(Son Bo-Sik),유정호(Yu Jung-Ho),김선국(Kim Sun-Kuk),이현수(Lee Hyun-Soo) 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.7

건설 현장 CCTV 영상에서 딥러닝을 이용한 사물 인식 기초 연구

강경수 ( Kang Kyung-su ),조영운 ( Cho Young-woon ),류한국 ( Ryu Han-guk ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2

The construction industry has the highest occupational fatality and injury rates related to accidents of any industry. Accordingly, safety managers closely monitor to prevent accidents in real-time by installing surveillance cameras at construction sites. However, due to human cognitive ability limitations, it is impossible to monitor many videos simultaneously, and the fatigue of the person monitoring surveillance cameras is also very high. Thus, to help safety managers monitor work and reduce the occupational accident rate, a study on object recognition in construction sites was conducted through surveillance cameras. In this study, we applied to the instance segmentation to identify the classification and location of objects and extract the size and shape of objects in construction sites. This research considers ways in which deep learning-based computer vision technology can be applied to safety management on a construction site.

데이터 웨어하우스 기술을 활용한 학교시설물의 환경개선예산 분석 - OO교육청 초·중·고등학교를 중심으로 -

박민규,손창백,류한국,Pak, Min-Kyu,Son, Chang-Baek,Ryu, Han-Guk 한국교육녹색환경연구원 2014 교육·녹색환경연구 Vol.13 No.1

With introduction of amended educational curriculum in 2007, optimizing project of educational environment to accomplish its purposes and goals includes expanding educational facilities and supplying eco-friendly school facilities. However, while the focus of optimizing project of educational environment is quality improvement of educational facilities, aging of these facilities built at th times of quantitative expansion and its management become serious problems. Higher concerns on studies and jobs on management of building caused by serious aging of facilities, management cost of building becomes a very crucial issue. Therefore, this study aims to analyze environment improvement budget of school facilities through building and using data warehouse, by investigating and analyzing the current status of environment improvement budget of school facilities and its cost through questionnaire and interview surveys on officers who are in charge of environment improvement budget of school facilities in educational administrations. This study thus analyzed environment improving budget of school facilities by using data warehouse technology collecting related data to the topic and setting levels by region, school class, establishment year, school facility types and others.

건설 현장에서 발생한 업무상 재해가 근로손실일수 심각도에 미치는 특징 중요도 분석

강경수,최재현,류한국,Kang, Kyung-Su,Choi, Jae-Hyun,Ryu, Han-Guk 한국건축시공학회 2021 한국건축시공학회지 Vol.21 No.2

건설업은 전체 산업 분야 중에서 가장 많은 재해와 사망자를 발생시키는 산업 분야이다. 건설안전 재해를 줄이기 위한 큰 노력이 진행되어왔지만, 사망사고를 제외한 근로자의 업무복귀시간까지 회복되는 근로손실일수에 관한 연구는 매우 적은 편이다. 따라서 본 연구는 근로손실일수를 심각도로 정의하여 이를 분류하는 모형을 제안하고 학습된 모형을 통해 특징 중요도를 도출하고 중요한 특징을 분석하고자 하였다. 블랙박스 모형인 랜덤 포레스트의 학습 과정을 해석하고 추출된 특징 중요도를 통해 근로손실일수 심각도에 영향력을 행사하는 중요 변수를 추출하였다. 추출된 특징을 통해 내부에 존재하는 요인들을 분석하였다. 본 연구의 목적은 건설 현장에서 발생한 사고 사례 데이터를 랜덤 포레스트 모형을 통해 분석하고자 하였다. 근로손실일수의 심각도에 미치는 중요한 특징을 도출해 체계적으로 관리한다면 건설 재해를 예방할 수 있다. The construction industry causes the most accidents and fatalities among all industries. Although many efforts have been made to reduce safety accidents in construction, the study on the lost workdays that return to work place is insufficient. Therefore, this study proposes a model that classifies the lost workdays lost into moderate and severity, and derives the importance of variable and analyzes important factors through the trained random forest model. We analyze the learning process of the random forest which is a black box model, and extracted important variables that impact on the severity of the lost workdays through the extracted feature importance. The factors existing inside were analyzed through the extracted variables. The purpose of this study is to analyze the accident case data at the construction site through a random forest model and to review variables that have a high impact on the lost workdays. In the future, this sutdy can apply to improve construction safety management and reduce the accident of industrial accidents.

CPM 공정표를 선형 공정표로 변환하기 위한 액티비티 생성 방법

류한국(Ryu Han-Guk),장명훈(Jang Myung-Houn) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.1

The origin of CPM and PERT was used for specific military and commercial purposes. However, CPM network technique is insufficient to adopt work repetitiveness and space-based work productivity of high-rise building. Thus, linear scheduling methods such as LOB(Line of Balance), RPM(Repeitive Planning Method) and LS(Linear Schedule) have been developed and studied by many companies and researchers. However, when it comes to change the previous CPM network schedule to the linear schedule, the previous researches have not been well addressed work breakdown structure(WBS), space breakdown structure(SBS), and activity generation by combining WBS and SBS in order to present the activity in LOB chart. Given the circumstances of linear scheduling methods, we performed this research as follows. First, we studied previous researches related to linear scheduling methods and weighted the pros and cons of the previous researches and this study. We also proposed the method to combine WBS and SBS in order to present activities on linear schedule. Finally, we summarized this research and suggested the future studies. This research therefore proposes the method to effectively use the accumulated data of CPM network and at the same time generate activities in order to efficiently change CPM network schedule to LOB schedule.

건설 장비의 안전사고 예방을 위한 알람시스템 기초 연구

류한국 ( Ryu Han-guk ),강진우 ( Kang Jin-woo ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2

The number of deaths in the korean construction industry is more than three times the OECD average. Although safety management system should be improved to prevent the safety accidents, it is difficult to improve due to domestic safety conditions. Especially, in order to prevent accidents at construction sites, there is an increasing tendency to monitor the movement of workers and equipment in real time by introducing a location positioning system. Therefore, this study proposes a system that can monitor the position of workers and heavy equipments in real - time, detect danger and transmit alarms so that workers can pay attention to safety and keep safety. The system is expected to reduce safety accidents by transmitting alarms to workers so that they can pay attention.

건설공사의 작업 및 프로젝트 진도율(공정률) 관리를 위한 데이터 웨어하우스(공정통제 데이터 마트) 개발

류한국(Ryu Han-Guk) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.9

Recent construction industry requires construction duration competitiveness and successfully manage contracted construction duration. Construction schedule management is not only for construction schedule but for all the items of construction field management. Therefore, it is necessary to accumulate a bunch of construction schedule and work status data(work productivity, the percent completes of activity and project, etc.), predict properly right fact based on right circumstances and then prepare for the future construction project. From the perspective of that the actual information about construction duration is contained in the unit work of each construction project, it is very important to effectively store, use and facilitate the site-based data during construction. It can be feasible by using data warehouse technique. Therefore the purpose of this research is to develop construction schedule control data mart(CSCDM). Given the circumstances, this research was performed as follows. First, previous researches related to construction data warehouse were analyzed. The system architecture of CSCDM was proposed and the data model was designed in order to develop multidimensional cube generating work productivity, work schedule rate(WSR) and total project schedule rate(TPSR). In addition, CSCDM can systematically supply KPI(Key performance index) information as well as work productivity, WSR and TPSR. Finally, this study summarized this research contents and suggested the future studies.

착공전 단계에서의 철근콘크리트 공사 공정리스크 관리 방안

류한국,김선국,이현수,Ryu, Han-Guk,Kim, Sun-Kuk,Lee, Hyun-Soo 한국건설관리학회 2005 건설관리 : 한국건설관리학회 학회지 Vol.6 No.5

최근의 건설시장 축소와 주 5일 근무제도, 공기단축형 입찰제도의 도입, 후분양제도의 도입 등의 제도적 변화에 따라 건설 수주 경쟁은 더욱 치열해지고 있다. 그러나 건설공사는 공기지 연을 유발하는 수많은 공정리스크가 존재하고 있으며 이러한 공정리스크에 대한 인식과 그에 따른 체계적인 관리가 부진한 경우 건설공사의 경쟁력을 확보하는 데 여러 어려움이 존재한다. 이러한 문제점을 해결하기 위한 기존 연구는 공정리스크의 분류, 공정 리스크의 관리, 리스크 관리를 위한 시스템 개발에 치중하였다. 이에 본 연구는 전체 공정에 영향력이 크며, 위험발생 확률이 높은 철근콘크리트공사를 대상공종으로 선정하고 기존연구를 바탕으로 수차례의 전문가 면담과 난상토론을 실시하여 현실적인 리스크 요인과 관리방안을 제시하였다. According to the recent systemic changes such as construction market reduction, five days per week system, introduction of construction duration reduction bidding system and post-construction sale system, the bidding competition have been enhanced. However, there are many construction schedule risks which could delay construction completion. Without the proper identification of construction schedule risks and the structured construction schedule risk management, the competitive advantages of construction project could not be made. Previous researches to solve the problem have been focused on the construction schedule categorization, construction schedule management, and the system development to manage the construction schedule risk. Therefore, this study selected the reinforeced concrete construction as the studied work due to the major impact characteristics on the total construction duration and the quite accident rate, and then proposed the real construction schedule risks of reinforced concrete construction and the construction risk management method based on the previous studies, many times of expert interviews and brainstorming.

시스템 다이내믹스를 활용한 건설 특급기술자 수급전망

김성태,이현수,안선주,류한국,박문서,Kim, Sung-Tae,Lee, Hyun-Soo,An, Sun-Ju,Ryu, Han-Guk,Park, Moon-Seo 한국건설관리학회 2007 건설관리 : 한국건설관리학회 학회지 Vol.8 No.5

By prosperous condition of construction economy in the early 90s in Korea, the government needed a lot of the qualified professional engineers (PE) to manage the construction site. In order to meet the high demand of P.E., Government has established the admitted engineer systems(AES) in 1995 that give the authority of principal engineers to the admitted engineers who do not take the written examination but have equivalent working experience. Since 2000, professional $engineer^{\circ}{\phi}s$ shortage has been resolved. however, the opposite situation, which is serious over-supply of construction engineers has occurred. Thus, Government announced that would abolish the admitted engineer systems as recognized the existent admitted engineers(about 1,000,000 persons) from 2007. However, Professional Engineers Institution has strongly insisted that Government should not recognize existent admitted engineers. From this point of view, it is critical to make the supply-demand forecast systems as a derivative approach of System Dynamics also, that is useful in comparing the argument between Government and Professional Engineers Institution. This paper describes about principal $engineer^{\circ}{\phi}s$ supply change by admitted engineer system abrogation and suggests the idea to regulate the supply and demand with the improvement of the regal system. 90년대 초 한국의 건설 경기가 호황을 누리면서 건설현장을 관리할 수 있는 특급기술자에 대한 수요가 커졌었다. 이러한 특급기술자의 수요를 맞추기 위해 정부는 1995년에 기술사 시험에 의하지 않고 단지 경력 년 수만으로 특급기술자 자격을 부여하는 인정기술자제도를 만들었다. 그러나 2000년 이후 특급기술자의 부족 현상은 해소되었고, 그 반대로 특급기술자의 심각한 과잉공급이 초래되었다. 따라서 정부는 인정경력자제도를 폐지(기존의 인정경력자를 인정)하는 개정법을 시행하고 있다. 그러나 여전히 기술인 협회에서는 기존의 인정기술자까지도 인정하지 말아야한다며 대립된 주장을 펴고 있다. 본 연구에서는 이러한 대립 관점에서 시스템 다이내믹스 방법론을 이용하여 수요공급 예측 모델을 통해 정부와 기술인협회 사이의 대립된 주장을 해결할 수 있는 실마리를 제공할 것이다. 본 논문은 각 시나리오를 통해 인정기술자제도의 폐지이전(개정법 이전)과 개정법에 따른 인정기술자제도 폐지 후의 특급기술자의 공급 변화를 비교하고 있으며, 차후의 정책 입안자가 특급기술자의 수요와 공급의 균형을 위한 제안점을 시사하고 있다.

비정형 구조물의 시공성을 고려한 3차원 디지털 설계 최적화 프로세스

류한국,Ryu, Han-Guk 한국건설관리학회 2013 한국건설관리학회 논문집 Vol.14 No.5

Nowadays the widely used media in architecture include visualizations, animations and three-dimensional models. 3D digital methods using active CAM(Computer Aided Manufacturing) and CNC(Computerized Numerical Control) imaging have been developed for accurate shape and 3D measurements in freeform buildings. In contrast to a conventional building using auto CAD system and others, the proposed digital optimization method is based on a combination of 3D numerical data and parametric 3D model for design and construction. The objective of this paper is therefore to present digital optimization process for constructability of freeform building. The method can be useful in the effective implementation of an error-proofing process of freeform building during design and construction phase. 3D digital coordinate data can be used effectively to identify correct size of structural and finish members and installation location of each members in construction field. In addition, architects, engineers and contractors can evaluate design, materials, constructability and identify error-proofing opportunities. Other project participants can also include representatives from all levels of management, departments as well as workers and key subcontractors' personnel, if necessary. The 3D digital optimization process is therefore appropriate to serious variations in freeform shape. For future study, the developed digital optimization method is necessary to be carried out to verify the robustness and accuracy for constructability in construction field. 최근 상당기간과 공사비를 최소화할 수 있는 비정형 건축물의 설계와 시공이 새로운 기술로 구현되고 있다. 이는 비정형 건축물의 최적화 설계와 부재화를 통한 공장 생산 시스템과 현장 조립 및 설치 기술로 가능하다. 비정형 건축물의 구현을 위한 연구가 진행되어 왔으나 여전히 비정형 건축물 시공은 설계오류와 시공자의 도면이해 부족, 시공경험 및 공법의 부재 등으로 인하여 시공 품질과 공기, 공사비 증가 등의 잠재적 리스크를 포함하고 있다. 비정형 건축물의 시공품질 향상과 공기단축 및 시공비 상승의 문제점을 해결하기 위한 3D 디지털 설계와 제작 기술을 적용하는 것이 중요하다. 이에 본 연구는 비정형 구조물의 시공성을 고려한 3차원 디지털 설계 최적화 프로세스를 제안한다. 궁극적으로 본 연구는 비정형 구조물의 구조검토, CNC(Computerized Numerical Control) 가공에 의한 부재의 정밀제작, 설치, 시공의 오차관리로 최적 시공의 근간이 되는 비정형 건축물 외피 시스템 구현을 위한 최적화 설계 프로세스를 제시한다.본 연구는 비정형 건축물을 구현한 사례를 살펴보고 디지털 설계 프로세스와 적용 프로그램을 살펴본다. 비정형 건축물의 설계도의 3D 디지털 데이터 구축과 디지털 최적화 구현 사례로 4대강 대표 물문화관(The ARC)을 중심으로 설계단계에서 적용된 최적화 기법을 순차적으로 분석하여 비정형 건축물의 3차원 좌표제어에 대한 방법론을 제시한다.