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유혁,Yeong-Sin Kim,Park Geun Su,Yoon Joo Young,Kim Young Seok,Kim Chul Young,윤주호,Min-Jun Gim 한국고무학회 2025 엘라스토머 및 콤포지트 Vol.60 No.1
An acrylic polymer matrix with a high-temperature resistance was developed for rubber materials using a redoxinitiated emulsion polymerization process, which is an appropriate method for large-scale low-temperature production. In this study, highly polar acrylonitrile monomers were incorporated into the matrix design to enhance the processability of rubber manufacturing and improve its mechanical properties. The incorporation of strong polar functionalities into the polyacrylic rubber matrix is expected to enhance heat, oil, and chemical resistance and improve gas barrier properties. These expected characteristics demonstrate the significance of this research in providing foundational molecular design techniques for advanced applications of gaskets and sealing products, particularly in extreme environments.
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안동 · 임하호 주요 유입지천의 저서성 대형무척추동물 군집구조 및 군집안정성 분석
유혁,이미진,서을원,이종은 한국환경생물학회 2016 환경생물 : 환경생물학회지 Vol.34 No.4
This study was conducted to provide important basic information about effective management of the marine environment at major inflow streams in Lake Andong and Lake Imha. The investigation was conducted 8 times from May, 2015 (AD1, AD2, IH1, IH2) to September, 2016 (AD3, AD4, IH3, IH4), and 8 surveyed sites were selected at Lake Andong (4 sites) and Lake Imha (4 sites). The inquiry identified 114 species, 59,913.7 inds. m-2 in Lake Andong and 112 species, 39,038.4 inds. m-2 in Lake Imha. The results indicate that the number of species and individuals in Lake Andong is more than that in Lake Imha, because Lake Andong has a variety of riparian vegetation and a richness of organic materials. Community analysis at Lake Imha revealed a dominant index of 0.57 (±0.18), a diversity index of 2.87 (±0.31), an evenness index of 0.73 (±0.04), and a richness index of 4.17 (±0.71). The results of functional feeding group analysis showed that a high proportion of species and individuals are gathering collectors. The results of functional habitat group analysis showed that a high proportion of species and individuals are clingers. The result of a physico-chemical water assay and dissolved oxygen and electric conductivity tests revealed that these measures increased when the water temperature decreased. The result of Pearson’s correlation analysis by biological factors and physico-chemical factors showed that species and electric conductivity are highly correlated with one another. Major inflow streams of Lake Andong and Lake Imha were exposed to various point pollution sources and non-point pollution sources. This implies a necessity for continuous monitoring of the aquatic ecosystems in order to effect systematic water quality management of Lake Andong and Lake Imha.
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유혁,이승현,이상종 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11
항공부품의 비행시험을 위해 2인승 항공기를 유인/무인 모드 겸용 비행시험용 항공기로 개조하고 있으며, 신뢰성을 위하여 이중구조 비행조종계통을 탑재하고 있다. 본 논문에서는 이중구조 비행조종계통과 비행조종컴퓨터에 탑재되는 비행운영프로그램의 구조에 대해 설명하고, 입력신호관리 설계결과를 제시하였다. 이중구조 시스템의 비행운영프로그램 설계를 위해 센서 데이터 비교를 통한 Soft Fault 탐지 및 여러 데이터에서 최적인 1개 데이터를 선택하는 로직이 필요하며, 이러한 로직을 통하여 획득된 탑재장비 상태는 항공기의 비행제어 및 운용에도 연결되어야 함을 알 수 있었다. We are now developing an aircraft for flight test of avionics component by transforming two-passenger LSA-rate airplane, which can be operated as manned/unmanned mode, and dual-redundant flight control system is employed on the aircraft to increase reliability. In this paper, structure of the dual-redundant flight control system, structure of operational flight program embedded on flight control computer and design result of input signal management are described. Design of the OFP of dual-redundant system requires soft-fault detection logic thru sensor data comparison and sensor data selection logic to select optimal data among several data. On-board system status identified from these logic should be connected to flight control and operation of the unmanned aircraft.
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