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우주 환경 노화 영향성에 따른 CFRP 물성 거동에 대한 연구
강덕수(Kang Deok Soo),정화영(Jung Hwa Young),이재은(Lee Jae Eun),윤지현(Yun Ji Hyeon),최혜윤(Choi Hye Yoon),이재덕(Jae Duk Lee),이동우(Dong Woo Yi),김세영(Se Young Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.06
최근 항공우주 및 전자산업용 고성능 재료로 사용하기 위해 높은 열안정성과 낮은 기체방출 특성을 갖는 재료가 요구되어 왔다. 탄소섬유강화 고분자(CFRP) 복합재료는 고분자 매트릭스 내에 탄소섬유를 강화제로 결합된 복합재료(CFRP)가 활용되고 있다. 이러한 변화에 따라 항공우주 분야에서 인공위성 구조체의 주재료는 알루미늄에서 복합재료로 변화하였다. 우주환경 고온/고진공에서는 금속보다 고성능으로 평가되고 있는 CFRP 가 사용된다. 기존에 범용적으로 사용되는 고강도 재료와는 달리 우주환경의 고진공, 원자산소, 자외선, 열사이클, 미소유성체 및 우주 파편물에 의한 충격 등 지상환경에서는 발생하지 않은 치명적인 요소로 인하여 재료의 물성 변화 및 저하에 따른 검증이 요구되고 있어, 고강성/저 열팽창 복합재료의 검증이 필요하다. 본 연구에서는 우주환경에서의 복합재료 물성 신뢰성를 검증하고자 탄소섬유/수지 조합을 통한 CFRP의 우주환경 노화 영향성에 따른 물성 거동 및 변화에 대한 연구를 진행하였다. Recently, materials having high thermal stability and low outgassing characteristics have been required to be used as high-performance materials for the aerospace and electronics industries. Carbon fiber reinforced polymer (CFRP) composite material is a carbon fiber bonded to a reinforcing agent in a polymer matrix. According to these changes, the main material of satellite structures in the aerospace field has changed from aluminum to composite materials. CFRP, which is evaluated as higher performance than metal, is used in high temperature and high vacuum in the space environment. Unlike conventional high-strength materials, the material properties change and deteriorate due to deadly factors such as high vacuum in the space environment, atomic oxygen, ultraviolet rays, thermal cycles, impacts from microscopic planets and space debris. Verification is required. High strength/low thermal expansion composite materials need to be verified. In this study, in order to verify the reliability of the physical properties of composite materials, a study on the physical properties behavior and changes according to the effect of aging in the space environment of CFRP was conducted through a carbon fiber/resin combination.
청피(靑皮)가 뇌혈류와 복강내 Macrophage에 미치는 영향
김남순 ( Nam Soon Kim ),황경택 ( Kyung Taek Whang ),황일택 ( Il Taek Whang ),강덕수 ( Duk Soo Kang ),강학천 ( Hak Chun Kang ),한종현 ( Jong Hyun Han ) 대한경락경혈학회 2001 Korean Journal of Acupuncture Vol.18 No.2
Citri Reticulatae Viride Pericarpium is being used to regulate the flow of gi. However, the mechanism of its pharmacological actions is not well understood. The purpose of this research was to investigate effects of Citri Reticulatae Viride Pericarpium on peritoneal macrophages in mice and blood pressure, regional cerebral blood flow in rats. Nitric oxide production was tested using a Griess reagents, and a phagocytic activity of mouse peritoneal macrophage was tested using a luminometer. Blood pressure and regional cerebral blood flow was tested using a phygiograph, MacLab and Macintosh computer with data acquisition system. 1. Blood pressure was increased by Citri Reticulatae Viride Pericarpium in a dose-dependent manner. 2. rCBF was increased by Citri Reticulatae Viride Pericarpium in a dose-dependent manner. 3. Pretreatment with propranolol significantly inhibited Citri Reticulatae Viride Pericarpium induced increase in rCBF. 4. Citri Reticulatae Viride Pericarpium inhibited nitric oxide production from peritoneal macrophages in mice. 5. Citri Reticulatae Viride Pericarpium accelerated phagocytic activity of peritoneal macrophage in mice These results suggest that Citri Reticulatae Viride Pericarpium causes a diverse response of blood pressure, regional cerebral blood flow(rCBF), nitric oxide production and phagocytic activity. The increase in rCBF is also mediated by adrenergic βrecepter.