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방화문 내부 심재로 적용하기 위한 경량기포콘크리트의 물리적 성능 검토
홍상훈 ( Hong Sang-hun ),김봉주 ( Kim Bong-joo ),정의인 ( Jung Ui-in ),김해나 ( Kim Hae-nah ),박준서 ( Park Jun-seo ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
With the development of cities, the density of the population is continuously increasing as buildings become larger and more high-rise, but since the Haeundae residential complex fire in Busan in 2010, there has been a growing need to meet the fire protection performance of buildings as large-scale fires continue to occur every year. On the other hand, fire doors, which are one of the fire protection performance of buildings, have been judged unqualified in 82% of cases when fire doors constructed on the actual site were inspected after completion. The reason for this is that paper honeycomb and glasswool, which are used as core materials for fire doors, absorb moisture, reducing thermal insulation performance, and sagging due to increased weight, leading to performance degradation due to warping in empty spaces. To overcome these problems, research is underway to apply lightweight aerated concrete, an inorganic material, as a core material. Therefore, in order to select a blowing agent that produces stable bubbles prior to the production of lightweight bubble concrete for application as a fire door inner core, this study examined the physical performance according to the type of blowing agent and dilution concentration, and the following conclusions were drawn. Compared to vegetable bubbles and independent bubbles, synthetic bubbles have 3~8% higher thermal conductivity than independent bubbles, but 3~6% lower slurry density than vegetable bubbles, and 2~13% higher compressive strength, which is thought to be an improvement of synthetic bubbles.
스트레스 정도 및 신경정신학적 증상여부에 따른 심박동수 변이도의 차이
홍상훈(Sang-Hun Hong),공미희(Mihee Kong) 대한스트레스학회 2011 스트레스硏究 Vol.19 No.3
체내 자율신경계를 비침습적으로 반영하는 심박동수 변이도를 측정하여 스트레스 정도 및 불안, 우울, 불면 등 신경정신학적 증상여부에 따라 자율신경계 활성에 어떠한 차이가 있는지를 알아보았다. 2009년 4월 9일부터 2010년 5월 4일까지 건강검진을 위해 내원한 성인 남성 중 부정맥 등의 질환이 없는 192명을 대상으로 심박동수 변이도 측정과 스트레스 정도 및 신경정신학적 증상여부에 대한 자가 기입식 설문지를 시행하였다. 스트레스 정도는 한국어판 BEPSI score를 측정하여 그 정도에 세 그룹으로 분류하였으며, 신경정신학적 증상여부는 설문지상의 질문 중 “왠지 불안하다”, “늘 우울하다”, “불면증이 있다”라는 항목에 그렇다 라고 표시 경우를 각각 불안군, 우울군, 불면군으로 정하였다. 각 그룹에 따라 심박동수 변이도 중 SDNN, LF,HF, LF/HF에 어떠한 차이가 있는 지를 분석한 결과 나이에 대한 영향을 보정한 이후의 분석에서 스트레스 정도에 따른 세 그룹간에 심박동수 변이도 및 우울군 여부에 따른 심박동수 변이도의 차이는 없었으나. 불안군의 경우는 정상군보다 유의한 LF증가가 있었고(p=0.028), 불면군에서는 정상군과 비교하여 LF 및 LF/HF의 비율이 유의하게 증가되어 있었다(p=0.018, p=0.050). 따라서 불안과 불면과 같은 신경정신학적 증상을 주관적으로 호소하는 경우 심박동수 변이도 측정상 교감신경계가 보다 활성화 되어 있었다. We investigated the differences in the activity of the autonomic nervous system according to the degree of stress and the presence or absence of following neuropsychiatric symptoms-anxiety, depression, and insomnia, using heart rate variation (HRV) that represents autonomic nervous function in a non-invasive way. Of all adult men who underwent health exam from April 9, 2009 to May 4, 2010, 192 subjects without certain illnesses including arrhythmia were recruited for this study. They were tested for HRV and asked to fill in a questionnaire for the degree of stress and the neuropsychiatric symptoms. The degree of stress fell into three categories, and the neuropsychiatric symptoms were grouped into anxious, depressive, and insomnia group according to the mark checked on the questionnaire form for “feeling anxious for no apparent reason”, “always feeling depressed”, and “difficulty sleeping”, respectively. Comparison among groups was made for the differences in SDNN, LF, HF, and LF/HF ratio-components of HRV. After adjusting for age, it shows that there was no meaningful differences in HRV among three groups defined by the degree of stress and also among the groups by the neuropsychiatric status except for the significant increase of LF (p=0.028) in the depressive group. Compared to the normal group, the insomnia one presented significant elevations of LF and LF/HF ratio (p=0.018, p=0.050). In conclusion, neuropsychiatric symptoms such as depression and insomnia seem to be associated with the activation of sympathetic nervous system measured by HRV. (Korean J Str Res 2011;19:231∼236)
기포성형 압력변화에 따른 기포밀도 및 기포콘크리트의 물리적 성능에 관한 연구
홍상훈 ( Hong Sang-hun ),유남규 ( You Nam-gyu ),서은석 ( Seo Eun-seok ),김해나 ( Kim Han-nah ),김봉주 ( Kim Bong-joo ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
Foame concrete was used to reduce insulation problems and interlayer noise in slab. There have been no studies on the physical properties of foaming agents using foamed concrete,Only the physical properties of foamed concrete mixed with foam agent. It is judged that the density and distribution of Foams will be changed when the pressre is changed when the bubble is formed. In this study to investigate the changes of Foam density and the physical performance of foamed concrete by changing the pressure during Foam formation.
홍상훈 ( Hong Sang-hun ),유남규 ( You Nam-gyu ),서은석 ( Seo Eun-seok ),김해나 ( Kim Hae-na ),김봉주 ( Kim Bong-joo ),정의인 ( Jung Ui-in ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
Curtain wall is constructed in various forms and designs by forming the exterior walls of a building, and refers to non-bearing walls that divide the exterior and interior spaces of a building. Curtain walls require not only wind pressure, but also waterproof, insulation, insulation, and durability, as well as the effects of recent frequent earthquakes. Studies on the sleeve used to connect the vertical member mullions in the process of high-rise curtain walls are insufficient. In this study, sleeves connecting curtain wall mullions were developed to absorb external displacement, and the purpose of this study was to evaluate economic feasibility through comparison with existing construction methods.
홍상훈 ( Hong Sang-hun ),김봉주 ( Kim Bong-joo ),정의인 ( Jung Ui-in ),김해나 ( Kim Hae-nah ),박준서 ( Park Jun-seo ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
Fire doors installed to prevent the spread of fire in buildings are made of paper honeycomb, glass wool, and other materials. Due to their high water absorption rate, they absorb ambient moisture and degrade, and their increased weight causes them to sag internally, creating voids that can warp in the event of a fire and allow flames to pass through. To overcome these issues, research is being conducted on the physical performance of lightweight aerated concrete. However, there is a lack of research on how to ensure fire resistance. Therefore, in this study, the backside temperature of lightweight aerated concrete formulations was measured and compared and analyzied with the physical performance. Since it is difficult to achieve low density by saturation alone, aerated concrete with EPS was produced, which resulted in a density reduction of 24`26%, but the strength increase per unit cement increase was 5`25%, which tended to be lower than the formulation without EPS. The results showed that the lightweight aerated concrete with EPS was 130~140℃ lower than the lightweight aerated concrete with EPS, which is believed to be due to the melting point of EPS delayed the heat diffusion. In the future, wo plan to conduct research to identify the optimal formulation for fire door core materials by varying the amount of EPS added and using industrial by-products to increase long-term strength.
금속진공단열패널의 심재용 기포콘크리트의 성능에 관한 연구
홍상훈 ( Hong Sang-hun ),김봉주 ( Kim Bong-joo ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.5
건축물의 에너지 소비 중 40%인 냉·난방을 줄이기 위해 외피 단열향상이 중요시되고 있다. 이에 기존 단열재를 개선하기 위해 진공단열패널VIP(Vacuum Insulation Panel)을 건축물에 적용하기 위한 연구가 진행되고 있다. 하지만 VIP는 보수보강이 불가능해 이를 개선한 금속진공단열패널을 고려하였다. 금속진공단열패널의 심재는 진공압력을 버티고, 낮은 열전도율을 가져야 하므로 기포콘크리트를 채택하였다. 하지만 예비 실험을 통해 기포의 양이나 성질에 의해 0.001torr에 도달하는 시간이 다른 것을 확인하였다. 이러한 영향은 기포제의 종류 및 기포 슬러리 밀도 등에 의해 진공도달시간이 달라질 것이라 판단하여 최적 기포콘크리트 조건이 필요하다. 따라서 본 연구에서는 금속진공단열패널의 심재인 기포큰크리트의 기포제 종류 및 기포 슬러리 밀도에 따라 진공도달시간 및 열전도율 변화를 측정하여 심재로 적용 가능한 기초적 자료를 제시하는 것을 연구목적으로 한다. In order to reduce cooling and heating, which is 40% of the energy consumption of buildings, it is important to improve the insulation of the skin. In order to improve the existing insulation, research is being conducted to apply a vacuum insulation panel(VIP) to buildings. However, VIP cannot be repaired, so we considered the metal vacuum insulation panel. Since the core of the metal vacuum pressure and have low thermal conductivity, foam concrete is adopted. However, preliminary experiments confirmed that the time to reach 0.001torr differs depending on the amount and nature of the bubbles. This effect is determined by the type of foaming agent and the density of the bubble slurry, the vacuum delivery time is determined to be the optimum foam concrete conditions are necessary. Therfore, this study aims to present basic data applicable to core materials by measuring vacuum delivery time and thermal conductivity change according to the foaming agent type and foam slurry density of foam large concrete which is core material of metal vacuum insulation panel. Experimental results and analysis show that compressive strength can be used regardless of the type of foam, In terms of thermal conductivity, it is stable to use vegetable foaming agents at 0.9g/㎤ or less. In terms of the vacuum delivery time, the foaming agent appeared similar regardless of the type of foaming agent, but it is considered suitable to use vegetable foaming agent based on compressive strength and thermal conductivity