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저궤도 우주환경에서 에폭시-실리카 나노 복합소재의 열화거동 분석
장서현(Seo-Hyun Jang),한유수(Yusu Han),황도순(Do Soon Hwang),정주원(Joo Won Jung),김영국(Yeong Kook Kim) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.12
이 연구에서는 저궤도 우주 환경(LEO) 조건에서 나노실리카 에폭시 복합소재의 실리카 농도가 재료의 열화 거동에 미치는 영향에 대해 알아보았다. 실리카 입자를 에폭시 수지에 10%와 18% 두 가지 서로 다른 무게비로 나노복합소재를 제작하여 저궤도 우주 환경 모사장치에서 열화시켰다. 열화된 나노복합소재를 대상으로 열중량분석(Thermogravimetric Analysis, TGA)를 수행하였고 등변환법(Iso-conversional Method)에 기반한 Friedman 방법, Flynn-Wall-Ozawa(FWO) 방법, Kissinger 방법, 그리고 DAEM(Distributed Activation Energy Method)으로 활성화에너지를 계산하였다. 그 결과 나노입자가 섞이지 않은 샘플은 열화가 진행되면서 중가함을 보였다. 그러나 10%와 18%는 열화싸이클이 15회일 때까지 증가하였으나 그 이후에는 감소하였으며, 따라서 나노 입자가 열화 거동에 부정적인 영향이 있음을 보였다. 또한 활성화에너지 계산에 적용된 방법에 대해 토의하였다. In this study, the effects of Low Earth Orbit(LEO) environments on the degradation behavior of epoxy nano silica composite materials were investigated. The nanocomposite materials containing silica particles in different weight ratios of 10% and 18% were prepared and degraded in a LEO simulator to compare with the neat epoxy cases. Thermogravimetric analysis (TGA) was performed on the degraded nanocomposites and the activation energies were calculated by Friedman method, Flynn-Wall-Ozawa (FWO) method, Kissinger method, and DAEM (Distributed Activation Energy Method) based on the iso-conversional method. As the results, for the neat epoxy sample cases, it was found that the average activation energy was increased as the degradation was progressed. When the nano particles were mixed, however, the energy increased to the 15 environmental test cycles, and decreased afterwards, meaning that the particle mixture contributed adversely to the thermal degradation. Discussions on the results of the different calculation methods were also given.
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메를로 퐁티의 몸 현상학 관점을 통한 감각경험 연구: -한정미의 작품 <움큼>을 중심으로-
장서현 ( Seo Hyun Jang ),한정미 ( Jung Mi Han ) 대한무용학회 2024 대한무용학회논문집 Vol.82 No.2
Humans perceive the world through their embodied experience. The perceiving subject weaves subjective sensations and personal experiences to judge objects from a unique perspective. Rather than instant judgment, the human recognizes the object by directly engaging all senses. This study takes a phenomenological approach to the dance performance Handful(움 큼), analyzing the intrinsic meanings through the lived experiences of space, movement, and medium(clay). Merleau-Ponty's perspective reveals the body as the perceiving subject generates diverse meanings in the artwork. The work's space becomes a realm of total experience where sensations, knowledge, and language intersect. The relationships between dancers, clay, and audience demonstrate an intentionality that connects the internal and external. The clay is encouraged to form active exchanges, challenging traditional hierarchies. The dancers' movements innately seek play, imagination, and freedom, while also expressing textures of pain and loneliness. The body that pursues joy and liberation can be seen as an open embodiment with a positive worldview. Applying the phenomenological lens to dance creation and evaluation can help organize deeper layers of meaning and offer transformative experiences for the audience.
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