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PLA/PGA 차폐막과 실크 피브로인 차폐막을 이용한 발치와의 골유도재생술의 비교연구
황우진,정성념,김윤상,피성희,유형근,정종평,신형식,Hwang, Woo-Jin,Jeong, Seong-Nyum,Kim, Yun-Sang,Pi, Sung-Hee,You, Hyung-Keun,Chung, Chong-Pyoung,Shin, Hyung-Shik 대한치주과학회 2009 Journal of Periodontal & Implant Science Vol.39 No.2
Purpose: This study was designed to compare the bond regeneratiom effects of treatment using silk fibroin membrane ( Nanogide-S$^{(R)}$ ) resorbable barrier with control group treated by polyactic acid / polylacticglycolic acid membrane(Biomesh$^{(R)}$ ) Methods: 44 severe bone loss on extraction socket from 44 patients were used in this study. In experimental group 22 sites of them were treated by silk fibrin membrane as and the other 22 sites were treated by polyactic acid/ polylacticglycolic acid membrane as a control group. Clinical parameters including recovered bone width, length and radiographic parameter of vertical length were evlauated at base line and 3 months after surgery. Results: 1) Severe bone width, length was significantlly decreased in two group. 2) Bone width, length was significantlly decreased in two group. 3) Decreased bone width, length and radiographic examination differences between group. Conclusions: On the basis of these results, silk fibrin resorbable membrane has similar bone regeneration ability to polyactic acid / polylacticglycolic acid membrane in guided bone regeneration for severe bone loss defect on extraction socket.
황우진(Hwang Woo-Jin),신재규(Shin Jae-Kyu),최원기(Choi Won-Ki) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(계획계)
This study was performed to analyze the influence of solar transmittance of windows according to incident angle on building energy. The results of this study are follows; 1) Inside sloping window demands lower energy during the cooling season. Conversely, outside sloping window demands lower energy during the heating season. 2) Heating energy is fluctuated within the range of -8∼23 % on slope angle during the heating season, and cooling energy is fluctuated within the rage of -6∼16 % on slop angle during the cooling season. 3) The south zone is first and west, east and north in the order of zone transmitted solar. 4) The annual secondary energy is minimum when the angel of wall slope is 10 degree.
강제 환기에 의한 하절기 복토(覆土) 저장고 결로 방지 대책
황우진(Hwang Woo-Jin),전현석(Jeon Hyun-Seok),윤성도(Yoon Sung-Do),박선효(Park Sun-Hyo),손장열(Sohn Jang-Yeul) 한국건축친환경설비학회 2007 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
In case of earth-covered storage, the condensation occurs on surface of wall and stores in a hot season with high humidity because of low temperature of constructional mass. Therefore, the preventive plans should be considered to protect stores from the damage by corrosion in earth-covered storages. The study was performed at the Magazine of igloo type which is similar to earth-covered storages. A fan was installed at the air outlet for exhaust gas to conduct forced ventilation. The surface and indoor temperature were measured, and then the influence of those on condensation was analyzed. The results of this research are follows; 1) Forced ventilation by a fan affects the rise in surface temperature of walls and stores. 2) The condensation on surface of walls and stores was reduced after operating a fan.
Glazing 특성에 따른 고층 오피스 건물의 에너지성능 분석
황우진(Hwang Woo-Jin),김교준(Kim kyo-Joon),최원기(Choi Won-Ki) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4
In case of newly constructed buildings, the construction type is almost Curtain-wall system or large window in building skin. However, these kind of buildings have problems with regulations on building energy efficiency. And national regulations on building energy efficiency limit only the U-factor of window(except infiltration), it is hard to predict energy consumption of Curtain-wall buildings which gain large solar energy in summer. In this study, the influence of LSG(Light to Solar Gain) on energy performance was theoretically analyzed with simulation. LSG is the value of VLT divide SHGC and represents the optical performance of the glass or glazing. The Window & Therm program developed in LBNL was used to analyze window systems and EnergyPlus was used to building energy. Cases of glazing are three types; single coated Low-e clear glazing, tripple coated Low-e clear glazing, tripple coated Low-e tinted glazing. The results of this study are follows; 1) The building energy consumption of Alt-1, 2, 3 were about 300, 253, 259 kWh/㎡ · yr respectively. Therefore, improvement of LSG could save the energy up to 16%. 2) The saved energy could be converted 1 billion won as annual benefit of total energy costs 3) SHGC and LSG more influence on cooling energy than heating energy in office buildings.
오피스의 에너지소비와 Glazing 성능의 상관관계에 관한 연구 : U-value, SHGC, VLT를 중심으로
황우진(Woo-Jin Hwang),신재규(Jae-Gyu Shin),최원기(Won-Ki Choi) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
In case of newly constructed office buildings, the construction type of their skins are almost curtain-wall system or high WWR. These kinds of buildings have problems with energy efficiency. So, National regulations on building energy efficiency have been established, but the regulations focused on U-factor and SC of window. The building which have large windows on their skins is influenced by solar energy. Therefore, optical properties; SHGC, VLT are important factors for building energy. In this study, the correlation between glazing performance(U-value, SHGC and VLT) and energy consumption in office buildings was analyzed with simulation. Finally, EnergyPlus was used for building energy simulation.
황우진(Hwang Woo-Jin),이영균(Lee Young-Gyun),김유민(Kim Yu-Min),손장열(Sohn Jang-Yeul) 한국건축친환경설비학회 2008 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
A radiant heating applied to floor, so called 'Ondol', is a traditional heating method in Korea and has been widely used. The form of the Ondol has been modified so that ti can be applied to modem residential buildings. However, the Ondol system has limitation in keeping comfortable indoor-environment, because the Ondol is able to control floor temperature only. Therefore, raised-floor Ondol with ventilation that can provide pre-heated fresh outdoor-air was suggested to solve this problem. Under this system, the outdoor air flows through ducts in the cavity between slabs and Ondol panels so that it could be supplied to rooms after it was preheated. In raised-floor Ondol with ventilation system, the layout and length of ducts are very important because these factors determine the temperature and velocity of supplied air which influence thermal comfort. Therefore, this study examines the condition of air at ducts and diffusers.
토끼 두개골 결손부의 골재생에 대한 poly(lactide-co-glycolide) (PLGA) 의 영향
박재영,황우진,정성념,김윤상,피성희,유형근,신형식,Park, Jae-Young,Hwang, Woo-Jin,Jeong, Seong-Nyum,Kim, Yun-Sang,Pi, Sung-Hee,You, Hyung-Keun,Shin, Hyung-Shik 대한치주과학회 2009 Journal of Periodontal & Implant Science Vol.39 No.2
Purpose: The purpose of this study is to histologically and histomorphometrically evaluate the effect of PLGA on bone regeneration compared with bone graft material. Methods: The experimental study was conducted in 10 rabbits with 2 different healing periods of 2 and 4 weeks. Following surgical exposure of the calvarium, 4 circular bone defects with a diameter of 4.6mm were formed. Rabbits were divided into control group, test groups I, and II. 10 defects assigned to the test group Ⅰ were grafted with Nu-oss and other 10 defects assigned to the test group II were grafted with PLGA. The rest of the defects were in the negative control group. At 2nd and 4th week after surgery, 10 rabbits were sacrificed through intracardiac perfusion and then specimens were obtained. Histological analysis was performed following staining with trichorme and transversal sectioning of the calvarial bone. Results: A group which used PLGA showed tissue reactions characterized by severe inflammation, rather than distinctive new bone formation. Conclusions: The present experimental investigations have failed to prove any beneficial effects of PLGA. PLGA used in this study exhibited foreign body reactions and a less favorable pattern of new bone formation in comparison to control group. Conclusion: PLGA did not function as scaffold. Further investigations of many types of micro PLGA that could improve its potential in GBR procedures are needed.
환기 가능한 뜬바닥 온돌 시스템과 습식 온돌 시스템의 건설 단계에서 CO₂배출량 비교
성종수(Seong Jong-Soo),황우진(Hwang Woo-Jin),손장열(Sohn Jang-Yeul) 한국건축친환경설비학회 2008 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
Ondol, a kind of radiant heating system, is a Korean traditional one and it has been modified for modem life style. However, an existing Ondol system has no consideration of ventilation. Therefore, raise-floor Ondol with a ventilation system was suggested and developed. And the thermal performance of this system was proved through former studies. In 21st century, environmental regulations was strengthened internationally in order to avoid environment destruction and reduce greenhouse effect. Moreover, according to Kyoto Protocol, various nations agreed to cut their emissions of greenhouse gases below emission level. Korea was exempt form the standards by the protocol, but it is expected to include at the agreement in 2013. In Korea, a construction industry consumes 1/4 of fossil fuel, so that emission of greenhouse gases such as CO₂ is a big part in the whole industry. In this paper, CO₂ emission of raised-floor Ondol system and existing one were estimated and compared in a construction stage. The results of this study are follows; 1) CO₂ emission of a new system is about 22% less than an existing system. 2) In the new system, 90% of CO₂ were emitted at plywoods and Ondol panels. 3) When the raised-floor Ondol system is applied to apartments, it is expected that dead load, construction costs and CO₂ emissions are reduced.
신재규(Jae-Gyu Shin),황우진(Woo-Jin Hwang),최원기(Won-Ki Choi) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Glazing is created into a single window by being combined with its surrounding frames. What matters to such a material is to improve physical performances on priority, such as heat insulation, airtight, sound insulation, watertight and wind pressure. At the same time, it is required to improve the diversity of its forms to properly cope with the convenience of use, the simplicity of maintenance and the function fit for the stream of times in addition to the improvement of physical performances. Out of them, glazing should be appropriately selected according to the size of a building, the location of its site and the direction the building faces since it is directly influenced by sunbeams. Therefore, it is needed to select proper glazing by confirming the thermal breakage as well as the effect of wind pressure when selecting its material. Thus, this study aims to discuss precaution measures to minimize the phenomenon of thermal break and thermal breakage that happen when glazing is installed for curtain-wall buildings.
최기원(Ki Won Choi),황우진(Woo Jin Hwang),원종서(Jong-Seo Won) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
본 연구는 개정된 건축물의 에너지절약 설계기준을 만족하기 위한 AL커튼월에 대해 연구하였다. 고사양 유리와 단열 강화 프레임을 사용하여 AL커튼월의 열성능을 향상하였다. 프레임 열관류율 3.0 W/㎡・K 이하를 만족하는 디테일을 구현하기 위해서 크게 두 가지 요소 기술이 적용이 되었다. 열교차단재인 Polyamide를 적용하여 공간에서의 열전달을 차단하는 기술과 Vent창 유리 하부에 유리를 지지하는 부위를 기존 알루미늄 프로파일의 단일재료 구조에서 Polyamide와 결합하여 구성함으로써 외기에 직접 면하는 부위에서의 열전달을 최소화하였다. 이를 통해 Fix기준으로 프레임 열관류율이 약 13%의 성능이 향상되었고, Vent기준으로는 약 24%의 성능이 향상되었다. 커튼월 시스템의 시뮬레이션 결과를 보면, Fix 타입은 커튼월 시스템 열관류율 1.410~1.472 W/㎡・K로 분석되었고, Fix+Vent 타입은 커튼월 시스템 열관류율 1.438~1.482 W/㎡・K로 분석되어 상향된 법규 기준 1.5 W/㎡・K 이하를 충족하는 것으로 나타났다.