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세 가지 용액에 의한 기혼합형 MTA의 기계 및 물리·화학적 특성 연구
강태윤,최지원,김광만,권재성 대한치과재료학회 2021 대한치과재료학회지 Vol.48 No.4
The study aims to analyze the compressive strength, pH, and surface properties of mineral trioxide aggregates (MTA), which can be used as a pulp capping and root canal filling material. The tests were performed after immersing premixed types of MTA for seven days into three different solutions: simulated body fluid (SBF), saline, and distilled water (DW). A universal testing machine was used to measure the compressive strength after one and seven days of immersion. The un-immersed MTA was used as the control. To investigate the pH variation, MTA specimens were immersed in each solution and the pH was measured using a pH meter after 3, 6, 12, 24, 72, and 168 h. Changes on the MTA surface were also observed by SEM-EDS after seven days of immersion. Moreover, statistical analysis was performed by one-way ANOVA, Tukey's post-hoc test, and independent sample t-test. All experimental groups showed significantly higher compressive strengths compared to the control group (p<0.05). In addition, as the immersion time increased, the compressive strength gradually and significantly increased among all the groups. On the other hand, the difference was insignificant among solutions with the same immersion time (p>0.05). As the immersion time increased, the pH increased among all the groups, and the pH of samples immersed in saline and DW was significantly higher than that in SBF. The MTA surface immersed in each solution for seven days showed precipitates which mainly composed of Ca and Zr ions. Therefore, the type of contact solution does not significantly affect the compressive strength of MTA, but it significantly influences both the pH and surface condition
염료감응형 태양전지를 위한 KI 및 I2를 포함하는 유기/무기 복합 전해질막의 이온전도특성에 대한 연구
강태윤,신춘화,최미정,구자경,조남준 한국막학회 2010 멤브레인 Vol.20 No.1
염료감응형 태양전지에 사용되기 위한 유기/무기 복합소재를 합성하였다. 다양한 분자량(600, 1,500, 2,000, 3,400)의 polyethylene glycol 양 끝단을 ethoxysilane기로 치환하여 전구체를 제조하였으며, 전구체간의 졸-겔 반응을 통하여 복합소재를 합성하였다. 전해질막은 유기/무기 복합소재를 KI 및 I2로 도핑하여 제조하였으며, 제조한 전해질의 이온전도도 특성을 측정하였다. 전해질막의 이온전도도는 원료로 사용한 PEG에 크게 영향을 받았으며 가장 높은 이온전도도는 분자량 2,000의 PEG를 사용한 전해질막에서 볼 수 있었다. 복합전해질막은 이온전도도에 있어서 큰 향상을 보였다. PEO 전해질막에 비하여 분자량 2,000의 PEG를 사용하여 제조한 복합전해질막은 월등하게 높은 이온전도도를 보였다. Organic/inorganic composite electrolyte membranes were prepared for dye sensitized solar cell (DSSC). Poly (ethylene glycol) (PEG)s with various molecular weight (600, 1,500, 2,000 and 3,400) were ethoxysilated to fabricate organic/inorganic composite materials through sol-gel processes. The electrolyte membranes were produced by doping the composite materials with KI and I2, and their ionic conducting behaviors were investigated. The ionic conductivity of the composite membrane was highly affected by PEG molecular weight. The highest conductivity was shown by the composite membrane prepared with PEG with the molecular weight of 2,000. The composite electrolyte membranes showed considerable improvement of ionic conductivity. Compared to PEO electrolyte membranes, the composite electrolyte membrane by PEG, MW 2,000 showed much higher ionic conductivity.
메이지 초기 서양사상 수용의 방법론 ― 후쿠자와 유키치의 ‘분한’을 중심으로 ―
강태윤 이화여자대학교 이화사학연구소 2019 梨花史學硏究 Vol.0 No.59
In terms of the acceptance method of Western thought in Japan, ‘Bungen’ was used as a tool to explain other concepts in Fukuzawa’s works, not just a simple translation of itself. It was used for the Western realignment of the existing concept. Also it is revealed that the aspect of self-control of ‘Bungen’ is contained in early thought of Fukuzawa, which have so far been mostly dealt with “open” aspects such as freedom, equality and independence. Fukuzawa's methodology of reshaping the acceptance of modern Western ideas by identifying them as “the degree of self-control” is unique and notable, in terms of translation methodology and in his early thought.
후쿠자와 유키치의 초기 사상과 자유민권운동: <<학자안심론>>을 중심으로
강태윤 일본사학회 2019 일본역사연구 Vol.50 No.-
The evaluation of Free Civil Right Movement(Jiyu Minken Undo) with Fukuzawa Yukichi, is closely related to his early thought. In his writing Gakusya Anshin Ron, he agreed to the purpose of the promotion of civil rights, but he took a critical attitude toward the radical and power-seeking tendencies of civil rights groups. Also, he saw activities of people in everyday life as part of politics and pursued a gradual sense of civil rights in comparison to the civil rights groups. Such Fukuzawa's attitude coexist with its inherent reform-mindedness and gradual order-keeping tendencies, and it was an idea contained in his earlier ideas. In his early age, he thought that improving civil rights was essential to maintaining Japan's independence from the Western powers. Such Fukuzawa's civil rights theory based on this internal reform awareness, was of essentially a different nature from the civil rights faction, which was the axis of resistance to the Meiji government. On the other hand, he preferred the British political system for 'harmony', and he took Republican political system critically, through the example of French reign of terror. Also, he, a former government (Bakuhu) official before Meiji Restoration, strongly criticized the move to pursue changes in existing society against Bakuhu, and also advocated national unity centered on Bakuhu. These facts can be argued to have been behind Fukuzawa's resistance to revolutionizing society greatly, maintaining a critical attitude toward direct democracy in which the entire people participate in state affairs.