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Y.OHAMA,K.DEMURA,LEE,Y.S,YEON,K.S 강원대학교 석재복합신소재제품연구센터 1997 석재연 논문집 Vol.2 No.-
The maturity method in which the strength increase of cement concrete is expressed as a function of an integral of the curing period and temperature of the concrete has often been applied to its strength prediction. For the purpose of the application of the maturity method to the compressive strength prediction for lightweight polyester ortars using an unsaturated polyester resin as a binder, the lightweight polyester mortars with various catalyst and accelerator contents, are prepared, tested for compressive strength, and the datum temperatures for the maturity equations are estimated. The maturity is calculated by using the maturity equations with the estimated datum temperatures. The compressive strengths of the lightweight polyester mortars are predicted from the maturity-compressive strength relationships.
연규석,大濱嘉彦,김남길,김철영,지경용 강원대학교 부설 석재복합신소재 제품연구센터 2000 석재연 논문집 Vol.5 No.-
불포화 에스트테르 수지의 큰 이용분야의 하나로 건축재료가 있으나 여기서 가장 문제로 되어 있는 것이 바로 난연성의 향상이다 불포화 폴리에스터수지는 탄소를 구성성분으로 하는 유기물이므로 무기재료와 같은 불연성을 기대하기는 어려우나 어느 정도까지는 연소를 억제시킬 수는 있다. 본 연구에서는 UP를 결합재로 하고 탄산칼슘을 충진재로, 규사를 잔골재로 하는 폴리머 모르터를 제조하고 이에 첨가되는 난연제량과 UP량을 각각, 5~12.5%, 12~24%로 변화시켜 난수별 난연특성을 고찰하였던 바, UP사용량에 따른 특정 난연제의 최적 사용량 범위를 얻을 수 있었다. One of the fields using the unsaturated polyester resin is the constructional material, but the most serious problem, in this field, is the incombustibility improvement. it is hard to expect the noncombustibility as in the inorganic materials for the unsaturated polyester resin since whose structural material is carbon, but the combustion can be controlled up to some degree. In this study the polymer mortars were made in which the unsaturated polyester resin as binder, the calcium carbonate as filler and the silica sand as fine aggregate. The incombustible characteristics were then investigated as varying the amount of the flame retarder and the unsaturated polyester resin from 5 to 12.5% and 12 to 24%, respectively. Based on the results, the optimized range of amount of flame retarder used with various amount of unsaturated polyester resin could be obtained.
적산온도법에 의한 에폭시 모르터의 초기강도 예측에 관한 연구
연규석,大濱嘉彦,이윤수,김철영 강원대학교 부설 석재복합신소재 제품연구센터 1999 석재연 논문집 Vol.4 No.-
에폭시 모르터를 보수용으로 사용할 경우 거푸집의 회전율을 높이고 완전한 시공관리 차원에서 초기강도의 예측은 매우 중요하다 할 수 있다. 이에 본 연구는 결합재로서 에폭시 수지를 사용한 폴리머 모르터를 제조하고 경화제의 첨가량에 따른 초기강도의 변화를 시멘트 콘크리트에 적용되어 온 적산온도 방법에 의해 예측하는데 목적이 있다. 에폭시 모르터 제조에 사용된 재료는 반응성 희석제로 변성한 저점도형 Bisphenol-A계 액상 에폭시를 사용하였으며, 경화제는 지방족 Amine 변성 경화제를 사용하였다. 실험결과 에폭시 모르터의 기준온도는 -3∼-11℃로 나타났고, 경화제 첨가량에 따른 적산온도와 압축강도 사이의 강도 추정식은 다음과 같이 구할 수 있었다. 30% : Y = 292.42 Ln(M) - 881.16 40% : Y = 386.64 LN(M) - 1223.1 50% : Y = 273.18 LN(M) - 1040.5 Epoxy mortar is widely used to repair cement concrete structure and predicting strength of the mortar is of importance in its application. The objectives of this study were to compare the development of compressive strength of epoxy mortar with respect to maturity and to propose a predictive model for strength development of epoxy mortar. A series of tests were carried out for the hardener contents of 30, 40 and 50 percentage of resin and compressive strengths were measured at the age of 6, 12, 24, 72, 120 and 168 hours respectively under the cure temperature of 0, 10, 20 and 30℃. The datum temperature was estimated by measured strength, and the maturity was calculated with the estimated datum temperature. It was shown that the compressive strength of epoxy mortar could be predicted by regression analysis from the maturity-compressive strength relationship.
Endoscopic Ultrasound-Guided Pancreatic Transmural Stenting and Transmural Intervention
Takeshi Ogura,Hideko Ohama,Kazuhide Higuchi 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.4
Endoscopic ultrasound (EUS)-guided pancreatic access is an emergent method that can be divided into the two main techniques ofEUS-guided rendezvous and pancreatic transmural stenting (PTS). While many reports have described EUS-guided procedures, theindications, technical tips, clinical effects, and safety of EUS-guided pancreatic duct drainage (EUS-PD) remain controversial. Thisreview describes the current status of and problems associated with EUS-PD, particularly PTS. We reviewed clinical data derived froma total of 334 patients. Rates of technical and clinical success ranged from 63% to 100% and 76% to 100%, respectively. In contrast, therate of procedure-related adverse events was high at 26.7% (89/334). The most frequent adverse events comprised abdominal pain (n=38),acute pancreatitis (n=15), bleeding (n=9), and issues associated with pancreatic juice leakage such as perigastric fluid, pancreatic fluidcollection, or pancreatic juice leaks (n=8). In conclusion, indications for EUS-PTS are limited, as is the evidence of its viability, due tothe scarcity of expert operators. Despite improvements made to various devices, EUS-PTS remains technically challenging. Therefore,a long-term, large-scale, multicenter study is required to establish this technique as a viable alternative drainage method.