• 한국건설관리학회논문집
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• 제17권2호
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• pp.90-98
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• 2016

고층 건설 프로젝트는 다양한 위험 요인이 있다. 주요 위험 요인은 시간 지연과 비용의 증가 등의 부정적인 결과이다. 따라서, 본 연구는 PROMETHEE 기법을 사용하여 초고층 건설공사 시공 단계에서의 위험 요인을 분석하였다. 이를 위해, 본 연구는 전문가 표적집단면접법(FGI)을 통해 위험 인자를 확인 하였다. 그리고 PROMETHEE는 초고층 건설공사 위험 분석을 위한 설정 평가기준으로 사용 하였다. 다음으로, 평가지표 계산의 기준은 PDRI에서 정의 레벨을 사용하여 구성하였다. 선호지수 및 평가 지표는 설문을 통해 규명되었다. 이러한 과정을 통해, PROMETHEE 기법을 이용하여 본 연구는 초고층 건설공사 시공 리스크의 중요도를 산정하였다. 그 결과, 높은 수준의 위험 요인은 다음과 같이 나타났다. 이것은 '재료 리프팅 운영 계획', '아웃리거 벨트 트러스 건설', '고층 건물의 기초 작업 계획'과 '고층 건물의 구조 개념을 고려'이다.

• KIEAE Journal
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• 제15권4호
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• pp.85-90
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• 2015

Purpose: In design and planning Building Integrated Photovoltaic(BIPV) system can reduce cost by replacing building facade as construction material such as roofs, outer walls and windows as well as generating electricity. BIPV system should be applied at the early stage of architectural design. However, it is hard to decide whether using BIPV system or not for architects and builders who are not professional at BIPV system because performance of system is considerably influenced by types of module, installation position, installation methods and so on. It is also hard for experts because commercialized analytical program of photovoltaic systems is too complicated to use and domestic meteorological data is limited to partial areas. Therefore, we need evaluation program of BIPV system which can easily but accurately interpret generating performance and evaluate validity of BIPV system at the early stage of architectural design even for inexpert. Method: In this study, we collected meteorological data of domestic major region and analyzed generation characteristic of BIPV system by using PVsyst(commercialized software) in accordance with regions, types of solar module, place and methods of installation and so on. Based on this data, we developed performance evaluation program of BIPV system named BIPV-Pro, through multiple regression analysis and evaluated its validity. Result: When comparing predictive value of annual average PR and annual electricity production of BIPV-Pro an that of PVsyst, each of root mean square error was 0.01897 and 123.9.

• 한국건설관리학회논문집
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• 제9권3호
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• pp.185-193
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• 2008

점차 대형화, 고층화되고 있는 공동주택공사에서 작업효율성을 향상시키고자 양중작업의 최적화를 위한 리프트 선정방식의 합리적 절차와 기준이 요구되고 있다. 따라서, 작업효율성 및 경제적 측면에서의 분석을 통하여 양중자재의 종류 및 규격, 건축물의 높이, 공사기간에 따른 건설용 리프트의 합리적 선정 및 운영을 위한 기준을 제시할 필요가 있다. 본 연구의 목적은 고층화 복잡화되고 있는 공동주택건설 현장여건에 따른 효율적 양중계획 및 관리를 위하여 대표적인 양중장비인 저속형과 중속형 리프트의 작업효율성과 경제성의 비교 분석을 통하여 최적의 선정을 위한 기초적 자료를 제시하는 것이다. 본 연구의 주요 결과는 40층 기준으로 중속형 리프트가 저속형에 비해 약 43%의 작업효율이 높은 것으로 분석되었다. 본 연구의 결과는 향후 공사의 용도, 규모, 형태, 조건 등에 알맞은 건설용 리프트 선정 기준/지침/규정을 마련하는 연구의 기초자료로 활용될 것으로 기대된다.

• Architectural research
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• 제18권4호
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• pp.145-149
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• 2016

Recently, a goal was set globally to reduce the Carbon Dioxide ($CO_2$) emission at national levels by 30 % in comparison to the Business As Usual (BAU) pursuant to the United Nations Framework Convention on Climate Change. As construction industry accounts for as high as 40 % of the $CO_2$ emission by the entire industrial sector in Korea, efforts toward reducing emissions from the construction industry are essential. Buildings are mainly responsible for $CO_2$ emissions, and, to reduce the $CO_2$ emitted from the buildings, a fast and accurate calculation method is required to be introduced in the architectural design phase. If the standardized data based on Building Information Modelling (BIM) is utilized, $CO_2$ emissions can be calculated quickly and accurately during the design phase. However, it is difficult for the designers who lack the knowledge regarding $CO_2$ emissions to reduce and manage such emission during the planning and design phases of buildings by estimating the quantities of various materials and the corresponding $CO_2$ emissions. Accordingly, the objective of this study is to develop a BIM-based $CO_2$ emission estimation system for a rapid and objective analysis and verification of $CO_2$ emissions.

• KIEAE Journal
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• 제13권6호
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• pp.113-120
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• 2013

Many countries over the world have taken many discussions and endeavors on environmental improvements of energy savings and greenhouse gas emission reductions for solving global climate change problems. In Korea, pre-considerations of environment-conscious factors in buildings have been taken to be critical with new constructions and renovation markets. In this situation, the Korean Green Building Certification(KGBC) system to induce the diffusion of sustainable buildings was introduced in 2002 and developed as an improved version of the G-SEED(Green Standard for Energy and Environmental Design) system in 2013 after major revisions. This research examines the importance of assessment criteria on apartment buildings to certify green buildings using the AHP(Analytic Hierarchy Process) method and suggests a new direction on certification assessment standards from the AHP result. In order to apply the AHP method, the survey via e-mail was conducted to design staffs in domestic architectural firms. As a result, assessment criteria such as ecological environment, indoor environment, and energy & environment pollution among 7 main ones proved to be important on assessing the G-SEED system for apartment buildings, while criteria such as land use & transportation, material & resource, water circulation management, maintenance management did relatively unimportant.

• Transactions on Electrical and Electronic Materials
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• 제18권1호
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• pp.30-34
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• 2017

The building integrated photovoltaic system (BIPV) attracts attention with regard to the future of the photovoltaic (PV) industry. It is because one of the promising national and civilian projects in the country. Since land area is limited, there is considerable interest in BIPV systems with a variety of angles and shapes of PV panels. It is therefore expected to be one of the major fields for the PV industry in the future. Since the irradiation is different from each installation angle, the output can be predicted by the angles. This is critical for a PV system to be operated at maximum power and use an efficient design. The development characteristics of tilted angles based on data results obtained via long-term monitoring need to be analyzed. The ratio of the theoretically available and actual outputs is compared with the installation angles of each PV module to provide a suitable PV system for the user.

• Structural Engineering and Mechanics
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• 제62권4호
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• pp.465-475
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• 2017

Photovoltaic (PV) panels are used in high-rise buildings to convert solar energy to electricity. Due to the considerable energy consumption of high-rise buildings, applying PV technology is of great significance to energy saving. In the application of PV panels, one of the most important construction issues is the connection of the PV panel with the main structures. One major difficulty of the connection design is that the PV panel connection consists of two separate components with coupling and indeterminate dimension. In this paper, the gap element is employed in these two separated but coupled components, i.e., hook and catch. Topology optimization is applied to optimize and design the cross-section of the PV panel connection. Pareto optimization is conducted to operate the optimization subject to multiple load scenarios. The initial design for the topology optimization is determined by the common design specified by the Technical Code for Glass Curtain Wall Engineering (JGJ 102-2003). Gravity and wind load scenarios are considered for the optimization and numerical analysis. Post analysis is conducted for the optimal design obtained by the topology optimization due to the manufactory requirements. Generally, compared with the conventional design, the optimized connector reduces material use with improved structural characteristics.

• 한국건축시공학회지
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• 제17권1호
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• pp.111-117
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• 2017

Stone powder sludge is a byproduct of the crushed aggregate industry, and most of it is dumped with soil in landfills. The disposal of stone powder sludge presents a major environmental problem. This paper investigates the effects of stone powder sludge on the fluidity, density, strength and micro-structure properties of AAC(autoclaved aerated concrete) samples. Stone powder sludge was obtained from a crushed aggregate factory in order to investigate its applicability as a substitute for quartz sand in AAC. To determine the properties of the AAC samples produced with stone powder sludge, specimens containing different foam ratios were produced. Flow value, density, compressive strength, tensile strength and flexural strength of the samples were tested, and X-ray diffraction (XRD) was performed. The test results indicated that the compressive strength of AAC specimens (F120) with stone powder sludge was higher than that of AAC specimens (Q120) with quartz sand for same foam ratio of 120%. For all XRD diagrams, a higher number of tobermorite peaks was shown for the F120 sample than for the Q120 sample, which may explain the slightly higher strength gain in the F120 sample.

• 한국실내디자인학회논문집
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• 제26권6호
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• pp.163-171
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• 2017

Brick is not only aesthetically beautiful and emotional material, but also eco-friendly and good building commodity for human health. Nonetheless, the use of brick has declined, due to the difficulty of building high-rise buildings and the limitation of the free form implementation. However, modern society is increasingly interested in environmentally friendly finishing materials for solving environmental problems. From this point of view, the brick architecture is being reexamined as a material to improve the living environment and to provide comfort without destroying nature. In addition, the development of digital technology enables the implementation of various types of masonry method and curved forms. Parametric design is one of the ways to realize the curved forms and various architectural expressions for brick architecture. In this background, the purpose of this study is to develop algorithms that can easily generate curved brick walls through parametric design, enable various pattern designs, and respond to real-time feedback. The details of the study are as follows. First of all, we examine organic architecture, the trend of brick architecture, and the concept of parametric design. Secondly, In order to generate curved surface with complex curvature, major planning factors affecting form generation are examined. Finally, we develop a parametric design method that consists of generating a curved surface for brick arrangement, implementing a parametric algorithm, and generating a curved form using bricks. Consequentially, we propose an algorithm that can maximize the use of ready-made bricks without using cut bricks to design curved walls and present efficient and economical design alternatives.

• 자원리싸이클링
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• 제16권2호
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• pp.32-39
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• 2007

폐자동차 ASR의 소각재를 대상으로 물리화학적 물성측정 및 리싸이클링을 위한 경량재료 제조실험을 수행하였다. 대상시료는 국내 ASR 소각장에서 채취한 바닥재 2종류와 비산재 4종류이었으며, 이들의 주요 성분 및 입도분석을 실시하고 공정시험법에 의한 중금속 용출량을 조사하였다. 또한, 비산재인 boiler ash를 원료로 하여 경량물질과 무기바인더를 첨가하여 성형 및 소성하는 방법으로 경량재료를 제조하였다. 바닥재에 Cu 함량이 3wt% 내외로 상당히 높은 것으로 나타나 Cu의 사전 분리가 필수적인 것으로 나타났다. 수용성물질을 많이 함유한 SDR(semi-dry reactor) ash와 Bag filter ash의 주성분은 각각 $CaCl_2{\cdot}Ca(OH)_2{\cdot}H_2O$ 및 $CaCl_2{\cdot}4H_2O$인 것으로 나타났다. boiler ash를 원료로 사용하여 제조한 경량재료 시편의 경우 중금속 용출이 크게 감소하였으며, 그 이유는 중금속 성분이 불용성 화합물천 안정화 또는 encapsulation 되었기 때문으로 판단되었다.