• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.11a
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• pp.10-11
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• 2018

Internal Insulation system is applied to the most apartment building in Korea. However due to the importance of building energy enhanced the interest of the exernal insulation system. The extermal insulation system has better thermal performance because the thermal bridge through the structure are rarely formed. But the thermal bridge around the window decrease the thermal performance of the envelope system. Therefore the technology for reducing the thermal bridge around window improves energy efficiency of the building. In order to this it is necessary to minimize the thermal bridge around window of building. In this study it is aimed to minimize the thermal bridge around the window of building. It was confirmed that the use of thermal bridge barrier imporved the heat transfer rate by 64% or more and the condensation reduction phenomenon by 42% or more compared with the exist technology. These thermal bridge barrier will be used as the main technology to improve the energy efficiency of building.

• 월간 기계설비
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• s.309
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• pp.48-50
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• 2016

대한기계설비산업연구원(원장 이언구)은 지난해 4월 연구심의위원회에서 선정된 ${\triangle}$기계설비건설업 동향분석을 위한 기초연구 ${\triangle}$기계설비건설업체의 부도예측 모형 연구 ${\triangle}$기계설비건설공사 시공상세도면 작성비 산정기준 연구 ${\triangle}$플랜트 건설현장 외국인력 고용 개선방안 ${\triangle}$녹색기술 기준에 근거한 연구과제 도출을 위한 기초연구 ${\triangle}$대용량 지열설비 이용을 위한 지중열교환기 용량 설계 툴 개발 ${\triangle}$기계설비배관 및 장비 단열 기준 연구 등의 기본과제와 외부기관과 공동으로 수행한 ${\triangle}$플랜트 건설현장 외국인력 고용 개선방안 ${\triangle}$기계설비건설업 관련법규 개선방안 연구를 추진했다. 본지는 지난 2월호부터 연구결과 요약 보고서를 연재하고 있다.

• 월간 기계설비
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• s.310
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• pp.112-114
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• 2016

대한기계설비산업연구원(원장 이언구)은 지난해 4월 연구심의위원회에서 선정된 ${\triangle}$기계설비건설업 동향분석을 위한 기초연구 ${\triangle}$기계설비건설업체의 부도예측 모형 연구 ${\triangle}$기계설비건설공사 시공상세도면 작성비 산정기준 연구 ${\triangle}$플랜트 건설현장 외국인력 고용 개선방안 ${\triangle}$녹색기술 기준에 근거한 연구과제 도출을 위한 기초연구 ${\triangle}$대용량 지열설비 이용을 위한 지중열교환기 용량 설계 툴 개발 ${\triangle}$기계설비배관 및 장비 단열 기준 연구 등의 기본과제와 외부기관과 공동으로 수행한 ${\triangle}$플랜트 건설현장 외국인력 고용 개선방안 ${\triangle}$기계설비건설업 관련법규 개선방안 연구를 추진했다. 지난 2월호에 시작된 연구원의 연구결과 요약 보고서는 이번호로 연재를 마친다.

• 월간 기계설비
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• s.307
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• pp.87-92
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• 2016

대한기계설비산업연구원(원장 이언구)은 지난해 4월 연구심의위원회에서 선정된 ${\triangle}$기계설비건설업 동향분석 ${\triangle}$기계설비건설업체의 부도예측 모형 연구 ${\triangle}$기계설비건설공사 시공상세도면 작성비 산정기준 연구 ${\triangle}$플랜트 건설 현장 외국인력 고용 개선방안 ${\triangle}$녹색기술 기준에 근거한 연구과제 도출을 위한 기초연구 ${\triangle}$대용량 지열설비 이용을 위한 지중열교환기 용량 설계 툴 개발 ${\triangle}$기계설비배관 및 장비 단열 기준 연구 등의 기본과제와 외부기관과 공동으로 수행한 ${\triangle}$플랜트 건설현장 외국인력 고용 개선방안 ${\triangle}$기계설비건설업 관련법류 개선방안 연구를 추진했다. 본지는 연구결과에 대한 요약 보고서를 연재한다.

• Journal of Bio-Environment Control
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• v.18 no.3
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• pp.185-191
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• 2009

The construction of experimental greenhouses, operating test, and analysis on variation of different environment factors were conducted to provide fundamental data for design of Korean style air-inflated double-layer plastic greenhouse. The development of technology of attaching plastic to the structure and fasteners to be able to keep airtight was required in order to maintain proper static pressure in air space of double layer coverings. The insulation effect of air inflated greenhouse was better than conventional type. The temperature of arch type roof was greater about $2^{\circ}C$ than peach type roof in air inflated greenhouse. It was recommended that the plastic should be attached at the edges without clearance length in order to ease installation and raise airtightness of double layer coverings. The transmittance of arch type roof was greater than peach type in air inflated one span greenhouse. The transmittance of air inflated greenhouse was greater than conventional type due to frame ratio and distance between double layers in three span greenhouse. The condensation occurred on conventional type greenhouse was more than air inflated type. It was required to examine for a long time in order to analyze it quantitatively.

• Journal of the Korean Geotechnical Society
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• v.26 no.7
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• pp.93-106
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• 2010

In performing a series of in-situ thermal response tests, the effective thermal conductivities of six vertical closed-loop ground heat exchangers were experimentally evaluated and compared one another, which were constructed in a test bed in Wonju. To compare thermal efficiency of the ground heat exchangers in field, the six boreholes were constructed with different construction conditions: grouting materials (cement vs. bentonite), different additives (silica sand vs. graphite) and the shape of pipe-sections (general U-loop type vs. 3 pipe-type). From the test results, it can be concluded that cement grouting has a higher effective thermal conductivity than bentonite grouting, and the efficiency of graphite better performs than silica sand as a thermally-enhancing addictive. In addition, a new 3 pipe-type heat exchanger provides less thermal interference between the inlet and outlet pipe than the conventional U-loop type heat exchanger, which results in superior thermal performance. Based on the results from the in-situ thermal response tests, a series of economic analyses have been made to show the applicability of the new addictives and 3 pipe-type heat exchanger.

• Journal of the Korea Concrete Institute
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• v.13 no.1
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• pp.69-76
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• 2001

Foamed concrete for cast-in-site, which shows excellent lightweight, thermal insulation, noise insulation, constructability and cost efficiency, has been applied as thermal insulation or filling material for On-dol. However, the technology is too insufficient to obtain the high level of quality, and serious problems often occur in quality control at sites. It, thus, is necessary to establish the proper and reasonable quality control method for ensuring the required quality, based on the investigation on the physical properties and their reciprocal relation. This study aims to settle the quality control method in case of applying FA foamed concrete replacing 40% by weight with fly-ash as the filling material for On-dol. The results of the study include the correlation among flow, as-placed density and foam ratio of fresh foamed concrete, the correlation between physical properties before hardening and after 28-day, provision of an equation to estimate 28-day compressive strength early with 7-day compressive strength, and suggestion of quality criteria for the revision of KS on foamed concrete for cast-in-site.

• Transactions of the KSME C: Technology and Education
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• v.4 no.2
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• pp.123-130
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• 2016

Unitex is widely used for the floor structure of urban railway vehicles because it shows good structural safety and heat insulation, has long life, and lowers the cost owing to easy installation. However, in spite of these merits, Unitex has a limit to the sound insulation performance, which is very important in vehicle structure. It shows a sound transmission loss considerably lower than the mass law value, which indicates the sound insulation performance per unit weight. Recently, railway vehicle manufacturers and Unitex supplier have tried to improve the sound insulation performance of Unitex, but meaningful results have not been achieved yet. Through the industry-university collaborative research, we propose structural improvement methods to increase the sound transmission loss by more than 5dB and we then verify the effect by performing experiments.

• Journal of the Korea Institute of Building Construction
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• v.10 no.6
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• pp.61-66
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• 2010

As global warming has had harmful effects on the environment, the construction industry has made efforts to reduce the amount of $CO_2$ generated in the process of cement production. There is an urgent need for an alternative material that can replace cement. To improve the initial strength and economical efficiency pointed out as problems, this research was conducted for Blast Furnace Slag (BFS), an industrial byproduct. Non-sintering cement (NSC) was used by minimizing the amount of high-priced alkali activators. By using Nano-technology, fineness has been maximized, to enhance the initial strength of BFS. This research is based on non-sintered cement replaced by nano-slag using alkali activators, and the fundamental properties and quality of the non-sintered cement were investigated. A variety of activators were used, up to 10 percent of the slag weight. This research aims to present fundamental data through a comparative analysis of flexural strength, compressive strength, time of setting, diabetic temperature, and rising heat.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.9
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• pp.518-527
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• 2020

The establishment of a green remodeling strategy is focused on technology, so the necessity of establishing a customized strategy considering the field situation has emerged. This paper examined the technology strategy through sensitivity analysis as a methodology for guiding strategy. For a 90-square-meter detached house, nine models of the construction standards of pre-1980s, 1984, and 2010 in Seoul, Daejeon, and Busan were assessed using the optimization method that combines the energy plus engine and the ModeFrontier. Sensitivity analysis was performed, and the remodeling strategy priority was derived. For pre-1980 models, the strategy for enhancing the roof insulation performance had a significant priority. The SHGC values of the windows were found to have the next highest priority regardless of the region and the time of completion, showing that the performance standard, including the SHGC, needs to be expanded. The possibility of remodeling while maintaining the existing geometry was confirmed because the adjustment of the window wall ratio accompanying large-scale demolition works has low priority. The priorities of technology strategies in each case showed very different patterns, suggesting the possibility of establishing a remodeling strategy by a comprehensive evaluation along with economics and constructability analysis.