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상수도시설 콘크리트 수조구조물에서의 염화이온 침투저항 특성분석
곽규성,마승재,최성민,오상근,Kwak, Kyu-Sung,Ma, Seung-Jae,Choi, Sung-Min,Oh, Sang-Keun 한국건설순환자원학회 2015 한국건설순환자원학회 논문집 Vol.3 No.2
The purpose of this study is to understand the necessity for waterproofing and corrosion-resistant technique application on concrete water tank used in water supply. Relevant research materials and regulation were collected, reviewing for the case studies of sample structures aged over 20 years, and experimental studies on chloride conduction for the high performance concrete and penetration properties of water repellency of liquid type materials. The result is that the concrete water tank in the water supply is needed for waterproofing and corrosion-resistant material coating to maintain long term durability due to the constant environmentally induced degradation deterioration often caused by chloride attack. 본 논문에서는 국내 외 관련 문헌 자료 및 규정에 대한 고찰과, 20년 이상 된 수조 구조물 현장의 사례 조사를 통해 수밀 콘크리트와 침투방지재의 염소이온 투과에 대한 실험적 평가 등을 통하여 결론을 도출하고. 방수층 및 부식저항기술을 음용수조 구조물(상수조 등)의 각 시설물별 방수 방식에 대한 성능을 동시에 만족하여야 할 필요성을 정립하는 것이다. 이는 수조 구조물들이 방수 및 침투방지재가 확실히 필요하다는 사실을 확언 할 수 있고, 또한 여러 가지의 콘크리트 침식을 발생시키는 요소와 원인들에서부터 장기적인 내구성을 화보할 수 있다.
오존을 이용한 고도정수 처리용 콘크리트 수조구조물 내부 방수ㆍ방식재의 오존열화 평가방법 제안 연구
곽규성(Kwak Kyu-Sung),서현재(Seo Hyun-Jae),미야우치 히로유키(Miyauchi Hiroyuki),김규용(Kim Gyu-Yong),오상근(Oh Sang-Keun) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.9
This study is on a suggestion of the evaluation method of O₃ deterioration of waterproofing and corrosion prevention materials in concrete facility for advanced water treatment using ozone(O₃) sterilization. Generally, drinking water has been sterilized with chlorine. But chlorine is not removed by means of smell and taste and organic pollutants such as ammonia nitrogen. So, in advanced water treatment, ozone (O₃) treatment, biological treatment and activated carbon are using for remove of smell and sterilization of drink water. And this advanced water treatment facility(structure) is made with concrete. For the protection of concrete from chemical attack by chloride, generally so many materials had been used on concrete surface as corrosion protection coatings. But strong oxidation of ozone decrease the durability of rubber or resin materials applied on the surface of concrete, those materials attacked by ozone (O₃) are uncleared weather have the corrosive protection effect of not, and also there is not the evaluation or test methods about ozone effect to materials. So, in this study, some ozone test methods are suggested for evaluation of ozone (O₃) influence to corrosive protection materials.
上水道 콘크리트 構造物 最適 維持管理를 위한 內部 防水/防蝕材의 附着强度 性能等級 設定에 관한 實驗的 硏究
곽규성(Kwak Kyu-Sung),서현재(Seo Hyun-Jae),미야우치 히로유키(Miyaushi Hirouki),김규용(Kim Kyu-Young),오상근(Oh Sang-Keun) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
It has been very difficult to choose suitable engineering method for concrete tank of water distribution because the guidelines of design standard, construction and quality control are unclear until yet. So, the evaluation method with required performance and election criteria for waterproof and anti-corrosion is necessary. In this study, 12 types of waterproof and anti-corrosion methods are evaluated with bond strength in the conditions of wet/dry, chemical agents deposition, ozone exposure treatment, and freezing and thawing. Based on the test results, performance rating method of bond strength with pre-conditions is developed with standard normal distribution and probability density function by applying 2σ. Also, evaluation matrix mechanism can be established for optimal performance requirements and reliable waterproof and anti-corrosion methods.
15년 이상 경과한 공동주택 옥상에서 노후화된 방수층 보호 콘크리트의 실태 조사에 관한 기초적 연구
곽규성(Kwak Kyu-Sung),구경모(Koo Kyung-Mo),오상근(Oh Sang-Keun),배기선(Bae Kee-Sun),김규용(Kim Gyu-Yong) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.10
The generally apartment houses in the 1980s are comprised of the topping concrete of the flat-roof. These topping concrete is requires advanced quality control of durability, because it directly is subjected to the deterioration factors of environments. However, the topping concrete is not correct a standard specification and a maintenance guidelines by reason of the nondearing structures. In addition, it is in bad keep the document for the mixing ratio site and thickness of the topping concrete. Therefore, the topping concrete is required standard valuation to decide whether is retention or not for repair works. As a result of actual state on the field, most topping concrete is occurred to deteriorate the surface crack, spalling, and pop-out scaling etc. Moreover, it is evaluated to the deterioration of general topping concrete through the freezing-melting, rebound test, neutralization, alkalinity, air void, and X-ray diffraction. These results lead us to the conclusion that the main cause of deteriorated topping concrete was decided that wouldn't be fulfilled quality control of concrete and was founded to accelerate deterioration of topping concrete for the neutralization and freezing-melting.
퍼지 계층분석 모형을 이용한 방수 시공업체 평가방법 제안에 관한 연구
오상근(Oh, Sang-Keun),신진학(Shin, Jin-Hak),송제영(Song, Je-Young),이선규(Lee, Sun-Gyu),곽규성(Kwak, Kyu-Sung) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.10
This research aims to present a method of selecting the optimum waterproofing construction firm through analysis utilizing the Fuzzy-AHP technique along with the help of waterproofing experts including construction site officials and existing Database. The 10 factors are roughly divided into 2 groups. Each 10 factors can be classified as either one of the 5 which are quantitatively measured or one of the 5 which are qualitatively measured. Firm A had the lowest distribution in construction cost selection factor out of the 4 waterproofing construction firms, but the difference was very small. Firm B showed high distribution in construction cost, site management skill and social awareness, but completion level and experience is lower compared to other 3 firms. Firm C had low distribution for every selection factor other than construction cost. Firm D shows very similar distribution pattern as firm A but lower distributions for construction completion level and ability to supply material.
미세골절술 후 생체막 덮개가 연골 재생에 미치는 영향 : 고식적인 미세골절술과의 전향적 비교 연구
손광현,김진호,곽규성,박장원,윤경호,민병현,Son, Kwang-Hyun,Kim, Jin-Ho,Kwak, Kyu-Sung,Park, Jang-Won,Yoon, Kyoung Ho,Min, Byoung-Hyun 대한관절경학회 2011 대한관절경학회지 Vol.15 No.2
목적: 슬관절의 연골 결손에 대한 미세골절술 후 병변을 덮는 생체막을 이용한 환자들의 치료 결과를 비교, 분석하고자 한다. 대상 및 방법: 2008년 1월부터 2010년 1월까지 관절경 검사로 확인된 슬관절 연골의 국소적 전층 결손이 있으며, 골관절염을 보이지 않는 53명(총 59례)의 환자를 대상으로 하였다. 무작위로 선정된 36명(42례)은 미세골절술 후 생체막으로 병변을 덮어주었고(실험군), 나머지 17명(17례)은 고식적인 미세골절술만을 시행받았다(대조군). 모든 환자는 수술 후 6개월째에 임상적 결과를 IKDC 설문지와 통증, 만족도에 대한 VAS 점수를 이용하여 비교하였고, 자기공명영상 촬영을 통해 골연골 병변의 회복 상태를 비교하였다. 결과: 임상 결과(IKDC, 통증 VAS, 만족도 VAS)에서 실험군이 대체로 더 우수하였으며 IKDC에서는 두 군 간의 통계적으로 유의한 차이를 보였다. (IKDC, p=0.047, 통증 VAS, p=0.074; 만족도 VAS, p=0.001). MRI 추시결과에서 실험군의 33명(78.6%)에서 우수한 결손 치유(67~100%)를 보이고, 5명(11.9%)만이 불량한 치유 소견을 보인 반면, 대조군에서는 4명(23.5%)의 환자에서 양호한 결손 치유가 관찰되고 9명(52.9%)의 환자들에서 결손 치유가 불량하였다(p=0.001). 실험군에서 35명(83.3%), 대조군 중 6명(35.3%)에서 변연부 결합부에서 간격이 관찰되지 않았다(p=0.001). 생체막 사용과 관련하여 심각한 부작용은 발견되지 않았다. 결론: 슬관절의 연골 결손 병변에 대해 미세골절술 후 생체막으로 도포한 군에서 단기 추시 임상적 결과 및 MRI를 이용한 영상학적 결과에서 결손부의 연골재생이 잘 된 것을 확인하였고, 미세골절술 후 ArtiFilm$^{TM}$을 함께 사용했던 군에서 연골 치유가 더 잘되는 경향이 있음을 시사한다. Purpose: Microfracture has been used as a first-line treatment to repair articular cartilage defects. In this study, a new technique using an extracelluar matrix biomembrane to cover the cartilage lesions after microfracture was evaluated in terms of cartilage repairability and clinical outcome compared with conventional microfracture technique in a prospective randomized trial. Materials and Methods: A total of 53 patients (59 cases) without osteoarthritis who had focal full thickness articular cartilage lesions were randomly assigned in two group. Seventeen patients (17 cases) underwent conventional microfracture procedure (control group) and thirty-six patients (42 cases) received microfracture and placing biomembrane cover (ArtiFilm$^{TM}$) concomitantly (experimental group). Clinical assessment was done through 6 months postoperatively using the subjective International Knee Documentation Committee IKDC questionnaire, and visual analog scale (VAS) for pain and satisfaction. Magnetic resonance imaging (MRI) was performed at 6 months after the operation in all patients. Results: In clinical outcomes, the significant difference was observed between both groups in IKDC, but not in VAS for pain and for satisfaction (final outcomes of IKDC, p=0.001; VAS for pain, p=0.074; VAS for satisfaction, p=0.194). The MRI showed good to complete defect fill (67 to 100%) in 33 patients (78.6%) of experimental group and 4 patients (23.5%) of control group, respectively. In control group, 9 of 17 patients (52.9%) showed poor defect fill (less than 33%), whereas 5 (11.9%) in experimental group (p=0.001). Assessment of peripheral integration revealed no gap formation in 35 patients (83.3%) in experimental group and 6 patients (35.3%) in control group (p=0.001). No serious complications or adverse effects related to the biomembrane were found. Conclusion: Good short-term follow-up clinical results were obtained in the group whose cartilage defects in the knee joint were covered with biomembrane after the microfracture, with the MRI findings confirming the excellent regeneration of the defective cartilage area. This suggests that the surgery to cover the defective area with biomembrane (ArtiFilm$^{TM}$) after the microfracture procedure is a safe, more effective treatment to induce cartilage regeneration.