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공동주택 세대 간벽-발코니 외벽 접합부의 적정 평면 단열상세에 관한 연구
김광우,송승영,류성룡,정병욱 대한건축학회 1996 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.16 No.1
The regions of joints in a apartment building envelope are apt to be thermal bridges. To improve the insulation performance of these regions, optimal insulation details should be applied. In this study, optimal plane insulation detail of the household partition wall-balcony exterior wall joint is sttegested after the evaluation of surface condensation and its life cycle cost. As a result, the effects of thernal bridging are reduced and its life cycle cost is minirrsized.
아스팔트 콘크리트의 노화 후 추출한 바인더의 물리적 특성 변화
김광우,도영수,김성운,Kim, Kwang-Woo,Doh, Young-Soo,Kim, Sung-Woon 한국도로학회 2002 한국도로포장공학회 논문집 Vol.4 No.4
Asphalt binder characteristics in asphalt mixture are changed due to aging. However. depending upon aggregate and binder used, asphalt mixture dose not show the same level of stiffness and brittleness under the same ageing level. The factors affecting Physical Properties change of the asphalt binder within aged asphalt concrete are not well known and there is limited study which is dealing with this topic This study dealt with evaluation of physical properties of asphalt binder recovered from the mixtures after short-term and long-term aging. Two asphalts. two aggregates. two gradations and four polymers were used to make 32 mixture combinations. The mixtures were prepared and aged artificially in a forced draft oven. The measured physical properties included absolute viscosity, kinematic viscosity and penetration. Statistical analyses were carried out to find out the factor(s) having a significant effect on change of physical property of asphalt binder due to asphalt mixture aging. The results of study shown that aggregate, gradation and polymer had a significant effect on change of physical properties of asphalt binder. 아스팔트는 노화에 따라 물리적 특성변화가 일어난다. 하지만 같은 수준으로 노화시킨 아스팔트 혼합물들임에도 골재와 결합재 등에 따라 서로 다른 강성이나 취성을 보인다. 이는 노화에 의한 바인더 특성 변화의 차이에 기인한 것인데 이와 같이 혼합물 내에서 바인더의 물리적 특성 변화 차이에 영향을 주는 요인에 대한 연구는 별로 없다. 따라서 본 연구에서는 아스팔트 혼합물의 노화 후추출한 바인더의 물리적 특성을 측정하고 물성 차이에 영향을 미치는 요인을 분석하였다. 폴리머 3종류와 골재 두 종류, 두 가지 입도, 두 종류의 아스팔트를 사용하여 32종류의 혼합물을 제조하고, 이를 장 단기 노화 처리하였다. 각 혼합물의 노화 후 Abson recovery 방법으로 바인더를 추출 회생하고 바인더 물성 시험(침입도, 동점도, 절대점도)을 수행하였다. 이를 SAS를 이용하여 통계 분석하였다. 바인더 시험에서 골재 종류와 폴리머가 노화시 물성변화에 차이를 가져오는 심각한 요인임을 알 수 있었고, 입도는 점도 변화에 큰 영향을 미치는 인자인 것임을 확인할 수 있었다. 본 연구 결과, 혼합물 내의 바인더 물성은 골재 종류, 입도, 개질제의 종류, 바인더의 종류 등의 다양한 요인에 의해 많은 영향을 받는 다는 것을 알 수 있었다.
김광우,김선숙 대한건축학회 1995 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.15 No.2
The mixed lighting concept of daylight for ambient lighting and artificial light for spot lighting is a new trend of exhibition hall design with the consideration of psychological effect and preservation of artwork. for daylighting of the exhibition hall, the top-sidelights such as sawtooth and monitor aperture are widely used. The purpose of this study is to provide top-side lighting design guidelines and configuration indices which are helpful for architects to determine size and dimension of windows at the preliminary design stage. 1n this study, the distribution of daylight factor in the unit exhibition space was analysed by the scale model test according to the variation of top-sidelighting shape. Design guidelines for the top-sidelight design in the exhibition hall were presented.
김광우,이현정,한경도,문정민,홍승욱,강은애,이주영,소호심,고성준,임종필,김주성 대한내분비학회 2021 Endocrinology and metabolism Vol.36 No.5
Background: Positive fecal immunochemical test (FIT) results have been recently suggested as a risk factor for systemic inflammation. Diabetes induces inflammation in the gastrointestinal tract via several ways. We investigated the association between FIT results and the incidence of diabetes. Methods: A total of 7,946,393 individuals aged ≥50 years from the National Cancer Screening Program database who underwentFIT for colorectal cancer (CRC) screening from 2009 to 2012 were enrolled. The primary outcome was newly diagnosed diabetesbased on the International Classification of Disease 10th revision codes and administration of anti-diabetic medication during thefollow-up period. Results: During a mean follow-up of 6.5 years, the incidence rates of diabetes were 11.97, 13.60, 14.53, and 16.82 per 1,000 personyears in the FIT negative, one-positive, two-positive, and three-positive groups, respectively. The hazard ratios (HRs) for the incidence of diabetes were 1.14 (95% confidence interval [CI], 1.12 to 1.16; HR, 1.21; 95% CI, 1.16 to 1.27; and HR, 1.40; 95% CI, 1.28to 1.55) in the one-positive, two-positive, and three-positive FIT groups compared with the FIT negative group, respectively. The effect was consistent in individuals with normal fasting blood glucose (adjusted HR 1.55 vs. 1.14, P for interaction <0.001). Conclusion: Positive FIT results were associated with a significantly higher risk of diabetes, suggesting that the FIT can play a rolenot only as a CRC screening tool, but also as a surrogate marker of systemic inflammation; thus, increasing the diabetes risk.