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신재성 ( Jae Sung Shin ),유난희 ( Nan Hee Yu ),강희곤 ( Hee Gon Kang ),신현탁 ( Hyun Tak Shin ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2011 한국환경복원기술학회지 Vol.14 No.2
This study monitored forest plant species vulnerable to climate change in Jiri Mountain, one of Korea`s representative alpine regions, in order to securely preserve plant genetic resources susceptible to climate change and to utilize the results as basic data for bioclimatology prediction and management on a long-term basis. A majority of indicator plants tended to blossom one week to one month later in 2010 than in 2009. As with the blooming dates, the falling dates of blossoms became later in most species, with the exception for Weigela florida and Oplopanax elatus. Leaf bursting as well fell on later dates in a majority of species excluding Carpinus laxiflora and Cupressus sempervirens, displaying the most obvious differences among the data of analysis of the 2009-2010 physiological cycle changes. It is believed that was due to the fact that temperatures in February, March and April, which affect plants` blossoming and leaf bursting, were lower in 2010 than in 2009 and that cold temperatures in the winter lasted for a longer period in 2010 than in 2009. The dates of leaves being changed to red were similar in 2009 and 2010 by being or later or earlier by several weeks in 2010 than in 2009 without any regularity. Most species` leaves began to fall at similar dates in 2009 and 2010 or at later dates by one to two weeks in 2010 than in 2009. The temperature differences in late 2009 and late 2010 were not so large, resulting in similar dates of falling leaves, and gaps in several indicator plants` physiological cycles without any regularity can be attributed to each individual plant`s physiological and environmental characteristics.
유리섬유 분리막 인장으로 인한 구조전지의 전기적 물성 변화
신재성 ( Jae Sung Shin ),박현욱 ( Hyun Wook Park ),박미영 ( Mi Young Park ),김천곤 ( Chun Gon Kim ),김수현 ( Soo Hyun Kim ) 한국복합재료학회 2017 Composites research Vol.30 No.1
질량 및 부피 증가없이 전지와 구조물기능을 복합재에 결합시키는 구조전지 연구가 광범위하게 진행되고 있다. 탄소섬유 및 유리섬유를 하중지지 및 음극, 분리막 용도로 사용하고, 하중전달이 가능한 고체전해질을 모재로 쓰는 것이 현재 아이디어 이지만, 고체전해질이 두 성능을 충분히 만족시키지 못하는 수준이라 구조전지를 구현하지 못하고 있는 실정이다. 그래서, 본 연구는 유리섬유 분리막 및 액체전해질을 사용하여 하중지지 및 전지의 기능을 동시에 수행하는 실험을 구성하여 액체전해액을 사용한 구조전지의 가능성 및 전기적 물성 변화를 관찰하였다. 인장된 분리막은 안정성을 떨어트리는 영향을 미치는데, 이는 양극의 미세입자들이 늘어난 유리섬유의 틈새로 침투하는 것을 분리막이 막지 못하기 때문이라 예상하였고, 상용 분리막을 추가로 사용 하여 그 예상되는 원인을 확인해 보았다. 그리고, 이러한 구조전지 시스템을 구현하기 위해서는 유리섬유 특성의 연구와 전극과 분리막의 계면에 대한 연구가 필요하다. Structural battery has been researched extensively to combine the functions of the battery and structure without gravimetric or volumetric increments compared to their individual components. The main idea is to employ carbon fabric as the reinforcement and electrode, glass fabric as the separator, and solid-state electrolyte which can transfer load. However, state-of-the-art solid-state electrolytes do not have sufficient load carrying functionality and exhibiting appropriate ion conductivity simultaneously. Therefore, in this research, a system which has both battery and load carrying capabilities using glass fabric separator and liquid electrolyte was devised and tested to investigate the potential and feasibility of this structural battery system and observe electric properties. It was observed that elongating separator decreased electrical behavior stability. A possible cause of this phenomenon was the elongated glass fabric separator inadequately preventing the penetration of small particles of the cathode material into the anode. This problem was verified additionally by using a commercial separator. The characteristic of the glass fabric and the interface between the electrode and glass fabric needed to be further studied for the realization of such a load carrying structural battery system.
신재성(Shin, Jae-Sung),김대영(Kim, Dae-Yeong),최기혁(Choi, Gi-Hyuk) 한국항공우주연구원 2020 항공우주산업기술동향 Vol.18 No.2
최근 우주 및 행성탐사에 대한 관심과 더불어 행성에서 샘플을 채취하여 지구로 귀환하는 연구도 국내 및 해외에서 수립 중에 있다. 우주비행체가 지구로 무사히 귀환하기 위해서는 수천도의 초고온에 노출이 되는 재진입 구간을 돌파하여야 하는데, 이때 초고온으로부터 우주비행체를 보호하기 위해서 열보호시스템(TPS, Thermal Protection System)이 필수적이다. 해외 각국에서 재진입에 대한 연구가 시작되었으나, 예산과 같은 문제로 인하여 실제 시험이 되지 않은 경우가 있다. 다만, 미국 및 유럽에서는 실제 시험된 사례들과 공개된 자료들이 많이 있으므로, 본 문헌에서는 이러한 자료를 바탕으로 미국 및 유럽식 열보호시스템의 기술동향에 대해서 살펴보기로 한다. Interests in Space and Planetary exploration increase and the research for sample return mission is under development in many countries. While Space Vehicle is on reentry phase, it is exposed to very high temperature, therefore, TPS(Thermal Protection System) is necessary for it to safely return. Although some countries had begun researches for Space Vehicle and TPS, all real flight tests are not performed due to the problem such as budget. In Europe and U.S.A, however, some post-flight analysis for reentry technologies were carried out and the data is accessible. Based on these materials, this paper introduces TPS technologies in U.S.A and Europe for re-entry.