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Thermal Cycling에 따른 자가중합 레진의 결합강도에 관한 연구
조혜원,하점임,Cho, Hye-Won,Ha, Jum-In 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.4
The purpose of this study was to evaluate the effects of two metal adhesive primers on the shear bond strengths of self-curing resin to Ni-Cr a]toy and the effects of 1000 thermal cycling on the durability of the bond. The two selected metal adhesive primers were Metal Primer II(G-C corp., Japan) and MR Bond(Tokuyama corp., Japan) and no treatment groups were used as control. All specimens were divided into two groups according to thermal cycling. In the group without thermal cycling, the specimens were stored in water for 24 hours. In the group with thermal cycling, the specimens were thermocycled 1000 times at temperature of $5^{\circ}C\;and\;55^{\circ}C$. Shear bond strengths were measured using the Universal testing machine(Zwick 145641, Germany) with a crosshead speed of 0.5 mm/min. The results were as follows: 1. MR Bond significantly improved the shear bond strength of resin to Ni-Cr alloy before and after thermal cycling. 2. There were no difference in the shear bond strength of resin to Ni-Cr alloy between Metal Primer II treated group and no treatment group. 3. Regardless of the type and the use of adhesive primers, there were tendency of decrease in shear bond strength with 1000 thermal cycling.
Attitudinal Stance in Online Argumentative Comments of NS and NNS Writers
조혜원 한국중앙영어영문학회 2014 영어영문학연구 Vol.56 No.1
The purpose of this study is to investigate an attitudinal stance in online argumentative comments written by NS and NNS, and to analyze modal verbs as stance markers in NS and NNS writing. Two corpora for the corpus-based analysis were compiled to be compared. The NS commentaries were taken from the archive of an online news website and the NNS corpus was constructed from argumentative comments written by thirty-seven Korean graduate students in a university. All comments were analyzed for the presence of stance-taking and stance-support and identified as having an attitudinal stance if they contained a claim. The findings revealed that L2 writers could take their stance as much as the L1 writers did and assertion of personal opinion and fact were the most commonly used stance-support strategies in both corpora. It was also found that the modals of necessity/obligation were the most commonly used to express a stance and stance-support in the NNS comments while the modals were the least used in the NS comments. A discussion of these findings, their limitations, implications and suggestions for future research was presented.