• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 춘계 학술논문 발표대회
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• pp.53-54
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• 2012

This study is aimed at utilizing LCA processor with BIM LOD, eliciting the problems of the existing environmental assessment by constructing the database for environmental values of green buildings. For these objects, environmental load database of BIM construction material and evaluation process are presented, after matching BIM family based environmental load database which is available during evaluation stage, input-output tables and Korea LCI database to standard item code of public procurement service. It is a important factor in environmental assessment of building to develop database unit of standard item code for BIM and construction material. Thus, the results of this study are expected to provide basic data for improving effectiveness of construction through BIM based environmental load evaluation database. Furthermore, the provided environmental load database unit for construction material is considered to be available as basic information for BIM study by suggesting a processor connecting BIM with LCA and along with this, continuous examination on the connection process is needed.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 추계 학술논문 발표대회
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• pp.147-148
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• 2012

With the rise of BIM application and green building assessment, studies on assessment of CO₂ emissions from buildings using BIM are needed. In accordance with the requirements, this study aims at developing BIM Template database, as a part of development of CO₂ assessment technology using BIM. Based on the research of construction materials, this study develops database by applying Procurement Agency Item Code to BIM Template. The results of this research makes it possible to assess CO₂ emissions of materials with BIM Template and building data modeling implementation.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 춘계 학술논문 발표대회
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• pp.47-48
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• 2012

In this study, the CO₂ emission and economic efficiency of high-rise apartment houses were evaluated, and were analyzed as a way to establish database on the evaluation of environment-friendliness of high-rise buildings. To that end, standard of buildings to be evaluated were proposed through analysis of the designing guideline for high-rise apartment houses proposed by Seoul city, and CO₂ emission of the subject buildings were evaluated based on the characteristics of materials admitted into each building and the amounts of energy consumed during lifecycle period. In addition, the initial costs in construction stage and annual costs in operation stage were set as analysis parameters, and along with calculation of direct cost by the consumption of construction materials and energy, the costs of CO₂ emission were evaluated and analyzed. As a result, the CO₂ emission and economic efficiencies of high-rise apartment houses by construction stage and operation stage could be analyzed quantitatively.

• 대한토목학회논문집
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• 제42권3호
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• pp.439-448
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• 2022

최근 해외건설시장에 참여하고 있는 국내 중소하도급업체들은 하도급계약조건 중 리스크 세부조항의 중요성을 인식하지 못하여 지속적인 손해와 피해를 받고 있다. 따라서 하도급계약조건의 리스크 세부조항 도출의 필요성이 제기되었지만, 지금까지 선행연구는 발주자와 시공자간 표준건설계약조건의 리스크 세부조항 도출 위주의 연구만 수행하였다. 본 연구에서는 국제컨설팅엔지니어연맹(FIDIC)에서 발행한 2011년 표준하도급 계약조건 94개 세부조항을 대상으로 델파이기법을 통해서 세부조항의 영향력 크기를 기준으로 52개의 리스크 세부조항을 도출하였다. 또한, 최종적으로 발생도 및 영향도의 PI Risk Matrix를 통해서 33개의 핵심 리스크 세부조항을 도출하였다. 이러한 본 연구결과는 해외 하도급 건설공사 입찰 및 계약 체결 단계에서 계약적 리스크 최소화를 위해서 선행 검토가 필요한 핵심 리스크 세부조항에 대한 유용한 정보를 제공 할 것이다.

• KIEAE Journal
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• 제16권3호
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• pp.77-82
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• 2016

Purpose: The aim of this study is to calculate U-factor of the window using international standard methods and compare quantitative and tendency difference focused on ISO standard 15099 and ISO standard 10077. And the result of ISO standard calculation methods is verified using thermal performance experiment to evaluate applicability of domestic certification system. This study is utilized a basis for activation of domestic window certification system. Method: First, 16 cases are selected that is combined a variety of frame, Glazing, spacer, etc. The selected cases were simulated using WINDOW&THERM based on ISO 15099 and 10077 calculation method. Second, experiment was conducted based on Korean standard condition. Then, it was compared the error of experiment and simulation results. Through this process, ISO 15099 and 10077 calculation methods were evaluated accuracy and utilization. Result: The results show that the difference of ISO 15099 and ISO 10077-2 is maximum 5.4%. The results of comparing U-factor errors based on the Korea standard experiment test found 2.4%. Consequently, it will be possible to combination calculation methods of ISO 15099 and ISO 10077 for a single window.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2014년도 춘계 학술논문 발표대회
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• pp.44-45
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• 2014

Recently the Korean government also has strictly restricted a law such as GBCC(Green Building Certification Criteria)and RPS(Renewable Portfolio Standard) on the construction. Especially the government announced a obligation of renewable energy consumption over 12% for all the public buildings of total area over 1,000㎡ since 2014. Regarding to the policy, this study presented the economics of energy analysis of the public office buildings that supplies 12% renewable energy output in the early stage of construction project. This paper calculated on CO₂ emission by the geothermal, solar heat, and solar photovoltaic system and estimated the saving cost. Reduced cost through the energy saving are predicted to influence on the total construction cost. As a result air pollution and energy saving cost are expected that renewable energy system would be saving total initial cost of construction on planning phase.

• 국제학술발표논문집
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• The 4th International Conference on Construction Engineering and Project Management Organized by the University of New South Wales
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• pp.262-268
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• 2011

According to the United Nations Framework Convention on Climate Change (UNFCCC), many countries around the world have been concerned with reducing Greenhouse Gas (GHG) emissions. Reducing the level of building energy consumption is particularly important in bringing GHG down. Because of this, many countries including the US and the EU are enforcing energy-related policies. However, these policies are focused on management of single types of buildings such as public buildings and office buildings, instead of management on a national level. Thus, although various policies have been enforced in many countries, CO₂ management on a national level is still not an area of focus. Therefore, this study proposed a community-based CO₂ management process that allows government-led GHG management. The minimum unit of the community in this study is a plot, and the process consists of three steps. First, the current condition of the GHG emission was identified by plot. Second, based on the identified results, the GHG emission reduction target was distributed per plot by reflecting the weighted value according to (i) the target CO₂ reduction in the buildings in the standard year, (ii) region, and (iii) building usage and size. Finally, to achieve the allocated target reduction, building energy management was executed according to the properties of the building located on each plot. It can be expected that the proposed community-based CO₂ management process will enable government-level GHG management, through which environment-friendly building construction can be promoted.

• ETRI Journal
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• 제45권3호
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• pp.404-417
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• 2023

This paper proposed a novel method for constructing quasi-cyclic low-density parity-check (QC-LDPC) codes of medium to high code rates that can be applied in cloud data storage systems, requiring better error correction capabilities. The novelty of this method lies in the construction of sparse base matrices, using a girth greater than 4 that can then be expanded with a lift factor to produce high code rate QC-LDPC codes. Investigations revealed that the proposed large-sized QC-LDPC codes with high code rates displayed low encoding complexities and provided a low bit error rate (BER) of 10^-10 at 3.5 dB E_b/N₀ than conventional LDPC codes, which showed a BER of 10^-7 at 3 dB E_b/N₀. Subsequently, implementation of the proposed QC-LDPC code in a softwaredefined radio, using the NI USRP 2920 hardware platform, was conducted. As a result, a BER of 10^-6 at 4.2 dB E_b/N₀ was achieved. Then, the performance of the proposed codes based on their encoding-decoding speeds and storage overhead was investigated when applied to a cloud data storage (GCP). Our results revealed that the proposed codes required much less time for encoding and decoding (of data files having a 10 MB size) and produced less storage overhead than the conventional LDPC and Reed-Solomon codes.

• 한국건설관리학회논문집
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• 제15권3호
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• pp.12-22
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• 2014

최근 국내 건설시장의 축소와 수주경쟁의 심화로 인하여 많은 건설기업들이 이에 대한 대안으로써 해외건설 시장에 진출하고 있다. 그러나 해외건설 프로젝트에서는 국내 건설 프로젝트와 책임과 권한의 범위가 다른 다양한 프로젝트 주체가 참여하고 있으며, 프로젝트를 둘러싼 수행환경 및 계약관행이 국내 건설 프로젝트와 다르기 때문에 다양한 리스크 요인이 존재하고 있다. 특히 해외건설 프로젝트의 문제가운데 하나가 Nominated Sub-Contracting (NSC)로 알려진 영국과 영국연방국가에서 사용되어지고 있는 하도급계약이다. 본 논문은 영국과 아시아지역 영연방 국가의 JCT약관, SIA약관, HKIA약관, PAM약관의 비교를 통해 NSC제도와 차이점을 소개한다. 또한 NSC계약의 채용 거부와 계약 해지와 관련된 약관항목분석을 통해 NSC제도의 유형을 분류한다.

• 국제학술발표논문집
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• The 10th International Conference on Construction Engineering and Project Management
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• pp.996-1001
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• 2024

To establish effective policies for reducing CO₂ emissions in the building sector, it is essential to analyze the feasibility of regulations. In this regard this study seeks to analyze the effectiveness of Energy Performance Certificate (EPC), Display Energy Certificate (DEC), and Minimum Energy Efficiency Standard (MEES) regulations implemented in the UK. In particular, it analyzes the effectiveness in terms of mandatory issuance of the building energy rating certificates (i.e., EPC and DEC) and the minimum energy performance regulations (i.e., MEES regulation) of the building. To this end, the effectiveness of the system implemented in the UK was analyzed using 31,915 EPC and 31,715 DEC data. The analysis found that the CO₂ emissions of properties due to the EPC and DEP issuance obligations decreased further in 2022 than in 2013. It was also found that starting in 2018 when the MEES regulation was implemented, the CO₂ emissions by property type continued to decrease. This is because property owners were highly motivated to improve building energy performance due to the implementation of the MEES regulation. Therefore, it is expected that the findings of this study will serve as important basic data for the policymakers of the government to develop more effective building energy performance improvement policies.