국제학술회의 참관기 - 제30차 국제지질학 총회 및 학술발표회

정대교,Jeong, Dae-Gyo 한국과학기술단체총연합회 1996 과학과 기술 Vol.29 No.11

지난 8월4일부터 14일까지 중국 북경에서 열린 제30차 국제지질학 총회 및 학술발표회에는 1백여 국가에서 1만여명이 참석하여 성황을 이루었다. 한국에서도 50여명의 지질학자들이 참가한 이번 학술대회에 다녀온 강원대 정대교교수의 참관기를 싣는다.

해외 선진국 사례와 IPA 기법을 이용한 건축공사 주요 안전관리 업무의 재해 예방효과 분석

정대교,서영준,신상욱,김대영,Jung, Dae Gyo,Seo, Young Jun,Shin, Sang Wook,Kim, Dae Young 한국건설관리학회 2022 건설관리 : 한국건설관리학회 학회지 Vol.23 No.5

Safety accidents on the construction scene can cause serious accidents, that take worker's life, and as the government has been making great efforts to reduce industrial accidents, the role of safety managers closely related to accidents at construction sites is becoming important. However, job stress is high due to excessive workload and inefficient work managed by safety managers in the current construction safety management system. So, it is necessary to improve and simplify the work contents. The main purpose of this study is to identify and improve tasks that need improvement and simplification of inefficient tasks, obtained through expert opinions and surveys on the level of difficulty and prevention effect of tasks in the safety manager's working stage, by using 2×2 Matrix analysis techniques. Therefore, this study will ultimately contributes reducing the occurrence of safety accidents on the construction scene.

해외 선진국 사례와 IPA 기법을 이용한 건축공사 주요 안전관리 업무의 재해 예방효과 분석

정대교,서영준,신상욱,김대영 한국건설관리학회 2022 한국건설관리학회 논문집 Vol.23 No.5

Safety accidents on the construction scene can cause serious accidents, that take worker’s life, and as the government has been making great efforts to reduce industrial accidents, the role of safety managers closely related to accidents at construction sites is becoming important. However, job stress is high due to excessive workload and inefficient work managed by safety managers in the current construction safety management system. So, it is necessary to improve and simplify the work contents. The main purpose of this study is to identify and improve tasks that need improvement and simplification of inefficient tasks, obtained through expert opinions and surveys on the level of difficulty and prevention effect of tasks in the safety manager's working stage, by using 2×2 Matrix analysis techniques. Therefore, this study will ultimately contributes reducing the occurrence of safety accidents on the construction scene.

Energy Operation Management for Smart City using 3D Building Energy Information Modeling

정대교,박승희,이동환 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.

During the last decade, global interest according to energy efficiency and climate change has dramatically increased. In particular,the building sector plays an important role, as it accounts for significant percentages of total energy consumption. So numerous highenergy efficiency devices have been developed and applied to building. But it is also important that such high energy efficiencyequipment is operated through efficient management. In this paper, through establishing a Building Energy Management System(BEMS) in the test-beds, the energy consumption and environmental data are measured and gathered at a total operation center. Theproposed energy saving technologies would integrate real-time energy consumption monitoring with Building Energy InformationModeling (BEIM). To find an optimal energy-saving method, a building energy simulation was used with Genetic Algorithms. TheHeating Ventilating and Air-Conditioning (HVAC) control schedules were sought. The energy-saving effect of this method is about9.44%. HVAC control schedules can be applied to building, using a function to control facilities in buildings. This energy-saving effectwill be added to the general saving effects for BEMS. It is expected that the proposed energy optimization tool using BEIM will beapplied to the micro-energy grid system for smart city in the near future.

백악기 풍암 퇴적분지의 생성 진화와 퇴적물 기원

정대교 강원대학교 자원개발연구소 1998 자원개발연구 Vol.13 No.-

FTA기법을 이용한 교육시설 누수 하자 유형 분석 및 주요 원인 관리방안

정대교,박현정,이동엽,김대영,Jung, Daegyo,Park, Hyunjung,Lee, Dongyeop,Kim, Daeyoung 한국건설관리학회 2024 한국건설관리학회 논문집 Vol.25 No.1

최근 건설 산업에서는 스마트 기술을 통해 건축물의 품질 향상과 안전확보에 노력하고 있지만, 여전히 누수 하자는 증가하는 추세이다. 특히 교육 시설에서는 노후화로 인한 하자 발생이 주요 문제로 부각되고 있습니다. 본 연구는 FTA 기법을 사용하여 교육시설 누수 하자 발생의 원인을 분석하고, 이를 바탕으로 예방 대책을 제시하고자 한다. 국내 문헌 조사를 통해 FTA 기법을 설명하고, 2019~2021년 교육지원청 데이터를 분석하여 주요 하자를 식별합니다. 교육시설 누수 하자의 FT 도를 구성한 결과 12개의 기본 사상이 추출되었습니다.이후, FTA 분석을 통해 누수 원인을 자세히 파악하고 주요 하자 원인을 도출하였다. 그 결과, 교육시설 하자 접수 건 중 누수 하자가 46.8%를 차지하며, 옥상층(천정) 누수가 가장 많았으며, FTA 분석 결과 옥상층(천정) 누수의 주요 원인으로는 바탕면 처리 불량으로 나타나며 이는 방수층 균열, 이음부 균열, 방수층 미시공 등에 기인하는 것을 확인하였습니다. 이 연구의 핵심 성과는 교육시설 누수 하자 예방을 위한 기초적인 자료를 마련하고, FTA 기법을 통해 누수 원인을 분석하여 사전 예방 대책을 도출하는 데 있습니다. 이러한 결과를 토대로 더욱 효과적인 교육시설 관리와 누수 예방에 기여할 것으로 기대된다. In recent years, the construction industry has diligently focused on improving the quality and safety of buildings through smart technologies. However, there is a growing trend of leakage defects, especially in educational facilities, due to aging. The objective of this study is to analyze the causes of these defects in educational environments using the Fault Tree Analysis (FTA) technique and propose preventive measures based on the findings. The FTA technique is explained through a review of domestic literature, and data from the Educational Support Center from 2019 to 2021 are examined to identify major defects. The construction of the Fault Tree (FT) for leakage defects resulted in the identification of 12 basic events. Subsequently, a comprehensive understanding of the causes of leakage is achieved through FTA analysis, leading to the identification of the primary causes of defects. Leakage defects accounted for 46.8% of all reported issues in educational facilities, with roof (ceiling) leaks being the most common problem. FTA analysis revealed that poor substrate treatment was the main cause of roof (ceiling) leaks, which could be attributed to cracks in the waterproof layer, joint cracks, and microvoids in the waterproof layer. The primary achievement of this research is to provide essential data for preventing leakage defects in educational facilities and developing preventive measures through the FTA technique. These results are expected to significantly enhance the management of educational facilities and the prevention of leakage issues.

먼 옛날 지구상의 숲 이야기

정대교 숲과 문화 연구회 2011 숲과 문화 Vol.20 No.2

KT스마트그리드 구현사례

정대교,김형수,유성민 한국통신학회 2013 정보와 통신 Vol.30 No.2

본고에서는 스마트그리드 사업을 적용하여 현재 세종시 첫마을에 추진하고 있는 스마트그린시티 건설프로젝트 사업에 대하여 다루어 보고자 한다. 행정중심복합도시건설청(행복청) 에서는 2030년까지 세종시의 이산화탄소 70%절감 그리고 세종시의 전체에너지 공급에 약 17% 정도를 그린에너지로 대체를 목표로 하고 있다. 이를 위하여, 우선적으로 행복청은 ICT 기술을 활용한 스마트그리드 기술을 적용하여 에너지 절감 목표를 추진 중에 있다. 행복청은 현재 첫마을 공공 4개 건물을 시범사업으로서 원격통합관리 서비스를 2012년 09월에 구축하기 시작 하였으며, 현재에는 이러한 설비들이 모두 구축된 상태이며 에너지 절감방안을 도출 중에 있다. 본고에서는 지금까지 진행되어 온 세종시 첫마을 원격통합관리 서비스에 대하여 알아보고자 한다.

참나무류의 비교내후성(比較耐朽性)에 관한 연구

정대교,민경희 한국목재공학회 1987 목재공학 Vol.15 No.2

This study was carried out under controlled laboratory conditions in order to investigate the relative durability to decay of 6 Quercus species The relative durability to decay was expressed by the percentage of weight loss by Lentinus edodes and Pleurotus ostreatus. The results obtained could be summarized as follows : 1. The most decay-resistant parts by L. edodes were heart wood of Q. serrata TH. and sap wood of Q. aliena BL. and the least decay-resistant parts were heart wood of Q. acutissima C. and sap wood of Q. dentata TH. 2. The most decay-resistant parts by P. ostreatus were heart wood of Q. serrata Th. and sap wood of Q. aliena BL. and the least decay-resistant parts were heart wood of Q. vaiabilis BL. and sap wood of Q. dentata. TH. 3. The percentage of weight loss in 6 Quercus species by section-height was not a consistent variation. 4. Putting these results together, Quercus aliena BL, could be retarded as the mast decay-resistant by L. edodes and P. ostreatus under normal condition among 6 Quercus species.

Effects of energy level, reconstruction kernel, and tube rotation time on Hounsfield units of hydroxyapatite in virtual monochromatic images obtained with dual-energy CT

정대교,이삼선,김조은,허경회,이원진,허민석,최순철 대한영상치의학회 2019 Imaging Science in Dentistry Vol.49 No.4

Purpose: This study was performed to investigate the effects of energy level, reconstruction kernel, and tube rotation time on Hounsfield unit (HU) values of hydroxyapatite (HA) in virtual monochromatic images (VMIs) obtained with dual-energy computed tomography (DECT) (Siemens Healthineers, Erlangen, Germany). Materials and Methods: A bone density calibration phantom with 3 HA inserts of different densities (CTWATER®; 0, 100, and 200 mg of HA/cm3) was scanned using a twin-beam DECT scanner at 120 kVp with tube rotation times of 0.5 and 1.0 seconds. The VMIs were reconstructed by changing the energy level (with options of 40 keV, 70 keV, and 140 keV). In order to investigate the impact of the reconstruction kernel, virtual monochromatic images were reconstructed after changing the kernel from body regular 40 (Br40) to head regular 40 (Hr40) in the reconstruction phase. The mean HU value was measured by placing a circular region of interests (ROIs) in the middle of each insert obtained from the VMIs. The HU values were compared with regard to energy level, reconstruction kernel, and tube rotation time. results: Hydroxyapatite density was strongly correlated with HU values (correlation coefficient=0.678, P<0.05). For the HA 100 and 200 inserts, HU decreased significantly at increased energy levels (correlation coefficient=-0.538, P<0.05) but increased by 70 HU when using Hr40 rather than Br40 (correlation coefficient=0.158, P<0.05). The tube rotation time did not significantly affect the HU (P>0.05). Conclusion: The HU values of hydroxyapatite were strongly correlated with hydroxyapatite density and energy level in VMIs obtained with DECT