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외단열 고정 방법에 따른 접착강도 기준의 제정 방안에 관한 연구
박완구(Park, Wan-Goo),박진상(Park, Jin-Sang),송제영(Song, Je-Yeoung),오상근(Oh, Sang-Geun) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.1
Energy issues is accelerated. As a result, insulation method is being applied actively in the buildings. External insulation method is efficient batter than other insulation method and it is applied on the external wall of the building actively. Apply method of external Insulation is divided Wet Construction, Dry Construction, Semi-Dry Construction. Wet Construction is adhesion method on the buildings using mortar of adhesion. Dry Construction is adhesion method on the buildings using anchor except water. Finally, Semi-dry Construction is adhesion method on the buildings using anchor + mortar. But When the strong wind blows, method of external Insulation is occurring problem of drop out in the rainy season. Therefore, this research progress enactment plan of standard of bonding strength in bonding part of external insulation method of wet construction, dry construction, semi-dry construction. The results of this research, Adhesion of Semi-Dry Construction is best than other methods. Should try to use based on the adhesion strength standard on the basis of the results as described above.
콘크리트 구조물에 사용되는 개량아스팔트 시트와 아스팔트 매스틱을 복합화한 방수공법의 누유현상 원인 분석
박진상,김동범,박완구,오상근,Park, Jin-Sang,Kim, Dong-Bum,Park, Wan-Goo,Oh, Sang-Keun 한국건축시공학회 2018 한국건축시공학회지 Vol.18 No.4
본 연구에서는 누유 현상에 대한 원인 파악을 위하여 실제 현장에서 누유된 시료를 채취하여 육안 관찰을 실시한 결과, 표면 상태의 변화를 근거로 누유 현상 원인이 "구성 성분간 분리"로 판단하고, 이에 대한 검증을 실시하였다. 검증을 위하여 현장에서 많이 사용되고 있는 아스팔트 매스틱 도막재 3개 제품을 수직 실린더에 채워 $50{\pm}5^{\circ}C$의 챔버 속에 정치시킨 후, 1일부터 28일간 매일 실린더의 상부, 하부 재료를 대상으로 Filler 함량차를 측정하여, 변화율을 비교 분석하였다. 평가 결과, 정치 시일이 경과할수록 아스팔트 매스틱의 Filler 성분이 침강되는 분리현상을 확인할 수 있었으며, 정치 후 28일에는 상부와 하부 시료의 Filler 함량이 최대 23.8% 이상 차이가 나는 것을 확인할 수 있었다. 상기 결과를 근거로 아스팔트 매스틱의 누유 발생 메커니즘에 대한 가설 수립 후 누유발생 전 과정에 대한 예측 모델을 제시하였다. In this study, observations of oil leakage samples taken from the actual site were performed to identify the causes of the oil leakage phenomenon. As a result, the separation of the material components was determined as the main cause of the oil leakage phenomenon based on the changes in the surface conditions, and verification of this was conducted. The evaluation results confirmed that the filler component of the asphalt mastic subsided with the lapse of the settling time, and that the difference ratio of the filler contents of the upper and lower specimens was up to 23.8% after day 28. Based on these results, a hypothesis on the oil leakage mechanism of asphalt mastic was established, and then modeling of the entire process of oil leakage was performed.
폴리우레아 방수재의 탄소섬유함량에 따른 내열성능 변화추이 연구
박완구 ( Park Wan-goo ),박진상 ( Park Jin-sang ),최수영 ( Choi Su-young ),김동범 ( Kim Dong-bum ),김병일 ( Kim Byoung-il ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
This study investigates the effect of improving the heat resistance performance when carbon fiber is mixed in the polyurea coating material. A tensile strength test method was carried out with the carbon fiber mixed polyurea specimens at an interval of 7, 14, and 21 days after heat treatment at 140±2℃. The test results showed that there was a significant decrease in the tensile strength performance. While the elongation and tensile performance decreased greatly, it was confirmed nevertheless the overall performance was maintained. This study proposes that mixing carbon fiber to the polyurea resin can effectively secure long-term heat resistance, thereby solving the problem of deterioration of physical properties caused by exposure to ultraviolet rays.
박상근 ( Sang Keun Park ) 대한뇌종양학회 2002 대한뇌종양학회지 Vol.1 No.2
First successful removal of pituitary tumor via the transsphenoidal approach was reported in 1907. Even though the admittable benefits of this approach based on direct and short extracranial route to sellar region, its clinical application came up against wall due to higher morbidity and mortality rates. But this approach had been used and developed continuously by a large numbers of named neurosurgeons. With the development of antibiotic drugs and modern microinstrumentation, transsphenoidal approach is the preferred approach for lesions confined to the sellar turcica and parasellar regions, and in some cases lesions of clibus as well. The routes of access for the transsphenoidal approach are sublabial transseptal, endonasal submucosal transseptal, direct endonasal with septal pushover, and endonasal endoscopic. Recently efforts have been made to use frameless stereotaxy, real-time intraoperative imaging, and the endoscope to improve effectiveness of the approach with minimal morbidities. Transsphenoidal surgery seems to be a reasonably safe procedure, with a mortality rate of less than 1%. However, a significant number of complications do occur, especially performed by less experienced surgeons. In hope of being better understood of this procedure the author has reviewed related literatures, and presents the history, the technique, the complications, and the modern evolution of transsphenoidal approach.