• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.83-84
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• 2023

Wall structure smart modular is a building construction method where modules are manufactured in a factory and assembled on-site. This method is gaining popularity in the construction industry as it reduces construction time and mitigates risks such as material supply and labor costs. Wall structure smart modular is necessary as it provides comfortable temporary classroom space during renovation and remodeling of aging school buildings. The structure and characteristics of each type of temporary classroom modular were compared, and wall structure modular showed superior performance in terms of height and weight competitiveness compared to mixed structures. With these advantages, wall structure modular can ensure economic efficiency and recyclability as a temporary classroom. In the future, we aim to compare and analyze the standards such as inter-floor noise and heat transfer coefficient for wall structure and mixed structures.

• 콘크리트학회논문집
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• 제25권3호
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• pp.295-304
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• 2013

초고성능 콘크리트(UHPC: Ultra-High Performance Concrete)는 최근 국내외에서 연구가 가장 활발한 분야 중 하나로서 구조물의 장수명화와 경제성 제고에 기여하고 있다. 품질관리 및 공사기간 단축을 위해서는 공장에서 제작된 프리캐스트 방식의 초고성능 콘크리트가 유리하지만, 이 경우에도 프리캐스트 세그먼트 간의 이음부 등 부득이 현장타설로 시공되어야 하는 부분이 존재한다. 그러나 현장타설 시에는 공장 제작 시와는 달리 최적의 양생 조건을 구현하기 어려울 가능성이 크다. 따라서 이 연구에서는 현장에서 예상되는 여러 가지의 열악한 양생 조건을 가정하였을 때 초고성능 콘크리트의 압축강도 발현 경향을 실험적으로 규명하였다. 양생온도, 양생 전 지연시간, 양생 지속시간, 수분 공급 조건을 변수로 두어 공시체를 제작한 후 표준적인 고온습윤양생으로 제작된 공시체의 강도와 비교하였다. 실험 결과를 분석하여 현장에서 타설된 초고성능 콘크리트를 양생할 때 요구되는 최소한의 조건을 제안하였다. 이 연구를 통해 초고성능 콘크리트의 현장에서의 활용도를 더욱 높일 수 있을 것으로 기대된다.

• 국제학술발표논문집
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• The 8th International Conference on Construction Engineering and Project Management
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• pp.75-84
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• 2020

Modular construction is a construction method whereby prefabricated volumetric units are produced in a factory and are installed on site to form a building block. The construction productivity can be substantially improved by the manufacturing and assembly of standardized modular units. 3D printing is a computer-controlled fabrication method first adopted in the manufacturing industry and was utilized for the automated construction of small-scale houses in recent years. Implementing 3D printing in the fabrication of modular units brings huge benefits to modular construction, including increased customization, lower material waste, and reduced labor work. Such implementation also benefits the large-scale and wider adoption of 3D printing in engineering practice. However, a critical issue for 3D printed modules is the loading capacity, particularly in response to horizontal forces like wind load, which requires a deeper understanding of the building structure behavior and the design of load-bearing modules. Therefore, this paper presents the state-of-the-art literature concerning recent achievement in 3D printing for buildings, followed by discussion on the opportunities and challenges for examining 3D printing in modular construction. Promising 3D printing techniques are critically reviewed and discussed with regard to their advantages and limitations in construction. The appropriate structural form needs to be determined at the design stage, taking into consideration the overall building structural behavior, site environmental conditions (e.g., wind), and load-carrying capacity of the 3D printed modules. Detailed finite element modelling of the entire modular buildings needs to be conducted to verify the structural performance, considering the code-stipulated lateral drift, strength criteria, and other design requirements. Moreover, integration of building information modelling (BIM) method is beneficial for generating the material and geometric details of the 3D printed modules, which can then be utilized for the fabrication.

• 한국건축시공학회지
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• 제23권5호
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• pp.571-581
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• 2023

최근 국내 건설산업은 건설업체의 경영난과 물량 감소로 인해 위축되고 있다. 국내 건설사들은 건설시장에서의 경쟁 우위 확보를 위해 모든 공종에 대해 원가절감 및 품질향상을 위한 노력을 기울이고 있다. 가치공학(VE) 기법은 건축공사에서 원가절감뿐만 아니라 공기 단축과 품질향상을 위한 도구로 활용되는데, 골조 공사 분야에 적용되는 성과가 상대적으로 미미한 실정이다. 공장 건설에서 골조 공사는 전체 공정에 큰 영향을 미치는 주요 공정이므로 골조 공사 계획단계에서 VE 기법을 도입해 설계도서와 현장 여건을 분석하여 품질과 안전을 확보하면서 공사 기간 단축, 원가절감, 작업성을 높일 수 있는 대안을 개발할 필요가 있다. 본 연구는 공기 단축, 원가절감, 시공 안전성 확보를 위한 기초연구가 될 것으로 기대된다.

• 한국항행학회논문지
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• 제22권5호
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• pp.485-489
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• 2018

4차 산업혁명의 일부인 스마트공장의 구축을 위해서는 작업 환경 및 생산 기기에 대한 데이터를 수집하여 이를 분석하고 피드백 함으로써 일어날 수 있는 고장이나 부품의 교체 시점 등을 예측하여야 하며, 이를 위해서는 작업 환경 및 생산 기기의 상태를 모니터링하는 시스템이 필요하다. 따라서 본 논문에서는 장거리 저전력 무선 통신 기술인 LoRa를 이용하여 작업 환경 및 생산 기기의 센서 데이터를 수집하여 Mobile과 PC용 모니터링 시스템을 구현하였다. Mobile 기기에서는 실시간으로 생산 환경 및 진동 데이터를 볼 수 있으며, PC 모니터링 프로그램에서는 센서 데이터를 그래프로 표현하여 표준 편차 및 데이터의 변동사항을 확인할 수 있게 프로그램 하였다. 구축된 시스템을 이용하여 생산 환경의 온습도 및 대기압 등의 데이터를 기록하고 생산 기기의 진동 데이터를 수집할 수 있음을 확인하였다

• 한국환경보건학회지
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• 제45권5호
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• pp.487-496
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• 2019

Objective: The purpose of this study was to create soil contamination maps using QGIS (Quantum Geographic Information System) and suggest selection methods for soil pollution sources for preferential investigation in a soil contamination survey. Method: Data from soil contamination surveys over five years in Gyeonggi-do Province, South Korea (2013-2017) were used for making soil contamination maps and analyzing the density of survey points. By analyzing points exceeding the concern level of soil contamination, soil pollutant sources for priority management were identified and selection methods for preferred survey points were suggested through a study of the model area. Results: A soil contamination survey was conducted at 1,478 points over five years, with the largest number of surveys conducted in industrial complex and factory areas. Soil contamination maps for copper, zinc, nickel, lead, arsenic, fluoride, and total petroleum hydrocarbons were made, and most of the survey points were found to be below concern level 1 for soil contamination. The density of the survey points is similar to that of densely populated areas and factory areas. The analysis results of points exceeding the criteria showed that soil pollutant sources for priority management were areas where ore and scrap metals were used and stored, traffic-related facilities areas, industrial complex and factory areas, and areas associated with waste and recycling. According to the study of the model area, the preferred survey points were traffic-related facilities with 15 years or more since their construction and factories with a score of 10 or more for soil contamination risk. Conclusion: Soil contamination surveys should use GIS for even regional distribution of survey points and for the effective selection of preferred survey points. This study may be used as guidelines to select points for a soil contamination survey.

• 한국인터넷방송통신학회논문지
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• 제19권5호
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• pp.63-71
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• 2019

4차 산업혁명시대를 맞이하여 스마트팩토리의 구축에 관한 많은 연구가 진행되고 있다. 이러한 스마트팩토리의 구축과 관련된 다양한 기술들 중에서 핵심기술 중의 하나는 데이터의 송수신을 처리하는 IoT용 프로토콜 부문이다. 이와 관련하여 일반적으로 MQTT 프로토콜이 가장 많이 사용되고 있으나 기존의 MQTT 기술은 메시지의 우선순위 개념이 없기 때문에 실시간성을 요구하는 산업용 현장에 적용하기에는 다소 부족한 면이 있다. 특히 특정 설비의 고장발생에 따른 관련 설비 전체의 비상정지 등과 같은 긴급 상황에서는 긴급한 메시지의 우선순위 처리가 매우 중요하다. 이를 개선하기 위해 우선순위 기반 MQTT에 관한 연구도 일부 진행되고 있으나 이러한 연구들은 MQTT 표준 규격을 변형한 방식이기 때문에 실제 현장에서 사용하기에는 문제점을 안고 있다. 따라서 본 연구에서는 MQTT 표준을 준수하면서도 메시지의 우선순위 처리가 가능한 MQTT에 관련한 연구를 실시하고 이를 검증한다.

• 한국건설순환자원학회논문집
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• 제2권2호
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• pp.93-100
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• 2006

Building materials are trending toward environmental materials nowadays and the market share of those is growing. So those researches and developments for environmental property are proceeding now. The main properties of environmental products are far infrared emission, negative ion emission, electro magnetic wave shielding, and anti fungus, these products are used with shape of mortar, and spray on the finish material. But There are not much researches for the concrete, main material in construction field, with those functional properties. So in this research we evaluated slump, compressive strength and air content as basic properties for concrete using functional materials of sericite, wood pattern sand stone, carbon black and nanometric silver solution and functional properties like far infrared emission, negative ion emission, electro magnetic wave shielding, and anti fungus. The results were as follows. The most useful material in the functional materials was carbon black. Sericite and nanometric silver solution had a little effect on functional property, so it was difficult to apply to concrete, and wood pattern sand stone had a high functional property but low compressive strength, can be applied to a factory product. Anti fungus of the concrete using nanometric silver solution was not clear but if those specimens were aged in $CO_2$ gas for a long time it might apparent.

• 한국농촌건축학회논문집
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• 제17권1호
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• pp.19-26
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• 2015

The old Samcheok construction company housing in Donghae City was built for employees of Nitrogenous lime factory with railway construction in 1939. The 31 company houses are arranged in a rows including a House A, two No. 2 and 3 Houses, a dormitory, 12 row houses of two households, and 15 row houses of four households. At present, they are preserved with prototype at that time of building as a private company. Researching the architectural characteristics from A and No. $2{\cdot}3$ detached houses of them, the results are as follows. The tea room, living room, and kitchen are centralized and connected with toilet, bathroom, and maid's room by corridor. The exterior wall was finished with paintwork on cement mortar on stud wall framing plastered. The key exterior elements such as diamond shaped asbestos slate, large openings, corner bay window, lintel cornice are in accordance with drawings that they were first designed. The wooden roof structure is based on the structure that supports transverse load with a beam and beam plate instead of thrust. The kitchen and toilet are remodelled and only seem to be a mere shadow of their former self, but the position of sink and toilet bowl is the same as before.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.34-35
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• 2019

In recent years, the construction industry has also applied the dry method that can be assembled in the field by industrialization and factory production, which is free from climatic effects and can reduce the cost due to mass production and simplify the work in the field. Among the building materials used in this dry method, ALC products are made by mixing calcium oxide, gypsum, cement, and water in silica and putting them in an autoclave to create voids in the interior through steam curing at high temperature and pressure. But it requires curing cycle conditions of warming, isothermal, and temperature curing. It depends on the performance of the product depending on the curing conditions, the economical efficiency due to high oil prices, the emission of greenhouse gases by the use of fossil fuels. Experiments were conducted to select an appropriate animal protein foam for lightweight foamed concrete block which was cured by applying a prefilling method to replace existing ALC products. As a result of investigating the characteristics of lightweight foamed concrete by type of animal protein foam, it is considered that FP3 is most suitable for manufacturing lightweight foamed concrete block.