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신영은,곽보민,권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Graphite is recognized as the best filler due to its excellent thermal conductivity, low cost, and good dispersion in matrix. The layer of the graphite with thickness of 20 to 100nm is called expanded graphite. It has been widely used as a polymer composite material. This study aimed to investigate the effect of size and dispersion of Expanded graphite (EG) on thermal conductivity and mechanical properties of silicone/EG composites. The silicone/EG composites with the mass fraction of 1%, 3%, 5%, 10%, and 20% EG were prepared by 2 kinds of mixing method (bulk, solvent). Compared to the pure silicone polymer, silicone/EG composite filled with 20% of EG (140um of average particle size), prepared by solvent mixing method dramatically improved the thermal conductivity from 0.15 to 1.1431 W/m K.
신영은,곽보민,권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Recently, great attention has been paid to the use of carbon materials for increasing thermal conductivity of polymer due to their unique nanostructures, high aspect ratio and superior thermal conductivity. Graphite is recognized as the best filler due to its excellent thermal conductivity, low cost, and good dispersion in matrix. CNT filler also have excellent thermal conductivity and good dispersion in matrix but expensive. This study is to investigate the effect of carbon filler type and content on the thermal conductivity and mechanical properties of silicone/grapheite composite materials and silicone/CNT composite materials. The silicone/carbon filler composites with the mass fraction of 1%, 3%, 5%, 10%, and 20% of carbon filler were prepared by bulk mixing method and investigated in detail
생각회피훈련을 이용한 생각억제와 생각대체 전략의 효과비교
신영은 ( Young-eun Shin ),민윤기 ( Yoonki Min ),이영창 ( Young-chang Lee ) 한국감성과학회 2021 감성과학 Vol.24 No.1
본 연구는 생각/생각회피 과제를 이용하여 의도적 생각회피, 즉 생각억제와 생각대체의 효과를 종합적으로 검증하였다. 이를 위해 연관성이 높지 않은 2음절 단어자극을 선정하고, 단일집단을 대상으로 회상조건(단서회상, 표적회상)과 훈련조건(생각, 생각억제, 생각대체, 기저선)의 정확회상률을 비교하였다. 그 결과, 훈련조건과 관계없이 표적회상에 비해 단서회상의 정확기억률이 높은 것으로 나타났으며, 회상조건과 관계없이 다른 조건에 비해 생각조건의 정확회상률이 높은 것으로 나타났다. 또한 회상조건과 훈련조건의 상호작용 효과의 경향성이 나타났으며, 세부적 검증 결과. 생각억제의 경우, 회상조건 간 차이가 나타나지 않은 반면에 생각대체의 경우에는 표적회상에 비해 단서회상의 정확기억률이 높은 것으로 나타났다. 이러한 결과는 생각억제와 생각대체전략이 모두 의도적으로 생각을 회피하는데 효과적이라는 것과 더불어 생각억제와 생각대체전략이 서로 다른 원리에 의해 발생할 수 있음을 시사한다. This study examined the effect of intentional thought avoidance(i.e., thought suppression and thought substitution) using “Think and No Think” task. Two syllable words were selected, and recall test was performed with a single subject group. recall accuracy of them was measured in two recall conditions(cue recall and target recall) and four training conditions(thought, thought suppression, thought substitution, and baseline). The results showed that recall accuracy in cue recall condition was better than in target recall condition, regardless of training conditions, and recall accuracy in thought condition was better than in other training conditions, regardless of recall conditions. Also there was significant interaction between recall and training conditions: For thought suppression. there was no difference between two recall conditions, whereas for thought substitution, recall accuracy in cue recall condition was better than in target condition. These findings indicate that thought avoidance strategies, including both thought suppression and thought substitution, are effective in avoiding the specific thought intentionally, and thought suppression and thought substitution could be applied by different mechanism.