고속 직기용 복합재료 헤들 프레임의 설계에 관한 연구

이창섭,오제훈,이대길,Lee, Chang-Seop,O, Je-Hun,Lee, Dae-Gil 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.2

The up and down speed of heddle frames that produce woven cloth by insertion of weft yarns between warp yarns has been increased recently much for productivity improvement, which induces higher inertial stresses and vibrations in the heddle frame. the heddle frame is required to reduce its mass because the heddle frame contributes the major portion of the stresses in the heddle frames during accelerating and decelerating. Conventional aluminum heddle frames have fatigue life of around 5 months at 550rpm due to their low fatigue flexural strength as well as low bending stiffness. In this work, since carbon/epoxy composite materials have high specific fatigue strength(S/p), high specific modulus(E/p), high damping capacity and sandwich construction results in lower deflections and higher buckling resistance, the sandwich structure composed of carbon/epoxy composite skins and polyurethane foam were employed for the high-speed heddle frame. The design map for the sandwich beams was accomplished to determine the optimum thickness and the stacking sequences for the heddle frames. Also the effects of the number of ribs on the stress of the heddle frame were investigated by FEM analyses. Finally, the high-speed heddle frames were manufactured with sandwich structures and the static and dynamic properties of the aluminum and the composite heddle frames were tested and compared with each other.

발달단계에 따른 인삼 (Panax ginseng C.A. Meyer) 배유세포의 Legumin에 대한 면역세포화학적 분포

이창섭,김우갑,Lee, Chang-Seob,Kim, Woo-Kap 한국현미경학회 1995 Applied microscopy Vol.25 No.1

Legumin was purified from the endosperm cells of the ginseng seed and analyzed its characteristics. Distributional patterns of the legumin in the endosperm cells were identified using the immunocytochemical method. Legumin was glycoprotein composed of two subunits, molecular weights about 33,000 and 25,000 respectively. The molecular shape of purified legumin stained negatively seems to have hexagonal structure about 10 nm in size. It was localized at the rER, dictyosomes, and in the vacuoles at the early developing stage. Legumin was glycosylated in the dictyosomes and transported from the dictyosomes to the vacuoles. Legumin was accumulated into the central vacuole via the dictyosomes while the endosperm cells were developing. The armorphous proteins containing legumin were scattered randomly within the central vacuoles, which were aggregated together and became gradually spherical shape. Legumin was distributed within the globular protein bodies in the endosperm cells of matured seed. However legumin was not found in the globoids located in the protein bodies.

연근해 어선용 표준형 추진기 개발

이창섭,강대선,이건화,김문찬,문일성,Lee, Chang-Sub,Kang, Dae-Sun,Lee, Kun-Hwa,Kim, Moon-Chan,Moon, Il-Sung 선박안전기술공단 2011 선박안전 Vol.31 No.-

최근 국제유가 상승과 탄소배출량 규제에 따른 친환경 선박의 개발 요구가 증대되고 있으며 이는 일반선 뿐만 아니라 어선에서도 마찬가지이다. 본 논문에서는 유류비 증가 및 어선의 노후화 등으로 인한 국내 어업 경쟁력의 약화 및 채산성 악화를 극복하기 위한 방안으로 연근해 어선용 추진기 개발을 위한 연구를 수행하였다. 현재 국내 어선현황에 기초하여 대표 선종인 130톤급 예망어선을 대상선으로 선정하고 추진기의 추진성능을 이론 및 실험적으로 평가 분석하였으며, 모형 시험 및 수치 해석 결과를 종합해 볼 때, 대상선의 프로펠러는 과도한 캐비테이션이 발생되는 상태에서 매운 높은 수준의 소음과 진동이 발생하는 것으로 추측된다. 이는 어선의 추진력 감소에 따른 연료비의 증대, 캐비테이션에 의한 추진기 손상, 과도하게 발생되는 소음에 따른 어획량 감소의 주된 원인이 된다. 본 연구를 통해 일반 상선의 추진성능 평가에 적용되는 최신 기술을 어선 추진기에 적용하여 모형시험 및 이론 성능 평가 과정을 정립하였으며, 이를 통해 앞으로 어선 추진기의 성능을 상당 부분 개선할 수 있음을 확인하였다.

국내 우주환경 자료 보유 현황: 전리권/고층대기

이창섭,이우경,한국우주과학회 태양우주환경분과,Lee, Changsup,Lee, Woo Kyoung,Division of Solar and Space Environment of KSSS, 한국우주과학회 2021 우주기술과 응용 Vol.1 No.2

한국우주과학회 태양우주환경분과에서는 국내 우주환경 관측 자료 활용도를 높이고, 분야 간 융합 연구 기회를 모색하기 위해 국내 연구소와 대학에서 활용 중인 태양, 자기권, 전리권/고층대기 자료 현황을 조사하였다. 자료는 관측 방식에 따라 지상과 위성 자료로 분류하였고, 개발 또는 활용 중인 모델 정보도 포함한다. 이 논문에서는 조사 결과를 바탕으로 극지연구소와 한국천문연구원에서 운영하는 전리권/고층대기관측기 현황과 자료 설명 및 활용 방법 등을 소개한다. 극지연구소에서는 남극 장보고과학기지와 세종과학기지, 그리고 북극 다산과학기지에 전천 카메라, 페브리-페로 간섭계, 이오노존데 등을 설치해 운영 중이다. 한국천문연구원은 보현산천문대 전천카메라와 충남 계룡대 VHF(Very High Frequency)/유성 레이더를 운영하고 있으며, 국내 40여 개 GNSS(Global Navigation Satellite System) 관측소에서 수집한 자료를 사용해 전리권 전자밀도 정보(total electron content)를 산출하고 있다. 또한 보현산천문대와 탐라 KVN천문대에 GNSS 신틸레이션 수신기를 설치해 전리권 교란을 관측하고 있다. 현재 관측 자료들은 웹 페이지나 FTP, 또는 요청을 통해 이용할 수 있다. 이 밖에 논문에 담지 않은 기타 전리권/고층대기 분야 자료 현황은 한국우주과학회 홈페이지에서 다운로드할 수 있다(http://ksss.or.kr/). 이 논문을 통해 우주과학 연구자들이 우주과학 자료에 대한 장기적이고 연속적인 관리의 중요성을 인식하고, 국내에서 생산 중인 자료의 활용도와 신뢰도를 높이는 데 이바지할 수 있길 기대한다. 더불어 국내 관측 자료의 활용을 극대화하기 위한 새로운 데이터 공유 체계에 관한 논의를 시작하는 계기가 되길 바란다. In 2020, the solar and space environment division at the Korea Space Science Society surveyed the status of data archives in solar physics, magnetosphere, and ionosphere/upper atmosphere in Korea to promote broader utilization of the data and research collaboration. The survey includes ground- and satellite-based instruments and developing models by research institutes and universities in Korea. Based on the survey results, this study reports the status of the ground-based instruments, data products in the ionosphere and upper atmosphere, and documentation of them. The ground-based instruments operated by the Korea Polar Research Institute and Korea Astronomy and Space Science Institute include ionosonde, Fabry-Perot interferometer in Arctic Dasan stations, Antarctic King Sejong/Jang Bogo stations, and an all-sky camera, VHF radar in Korea. We also provide information on total electron content and scintillation observations derived from the Global Navigation Satellite System (GNSS) station networks in Korea. All data are available via the webpage, FTP, or by request. Information on ionospheric data and models is available at http://ksss.or.kr. We hope that this report will increase data accessibility and encourage the research community to engage in the establishment of a new Space Science Data Ecosystem, which supports archiving, searching, analyzing, and sharing the data with diverse communities, including educators, industries, and the public as wells as the research scientist.

Preventive Effect of Korean Red Ginseng for Acute Respiratory Illness: A Randomized and Double-Blind Clinical Trial

이창섭,Ju-Hyung Lee,Mi-Ra Oh,최경민,정미란,Jong-Dae Park,권대영,Ki-Chan Ha,Eun-Ock Park,Nuri Lee,Sun-Young Kim,Eun-Kyung Choi,김민걸,채수완 대한의학회 2012 Journal of Korean medical science Vol.27 No.12

Korean Red Ginseng (KRG) is a functional food and has been well known for keeping good health due to its anti-fatigue and immunomodulating activities. However, there is no data on Korean red ginseng for its preventive activity against acute respiratory illness (ARI). The study was conducted in a randomized, double-blinded, placebo-controlled trial in healthy volunteers (Clinical Trial Number: NCT01478009). Our primary efficacy end point was the number of ARI reported and secondary efficacy end point was severity of symptoms,number of symptoms, and duration of ARI. A total of 100 volunteers were enrolled in the study. Fewer subjects in the KRG group reported contracting at least 1 ARI than in the placebo group (12 [24.5%] vs 22 [44.9%], P = 0.034), the difference was statistically significant between the two groups. The symptom duration of the subjects who experienced the ARI, was similar between the two groups (KRG vs placebo; 5.2 ± 2.3 vs 6.3 ± 5.0, P = 0.475). The symptom scores were low tendency in KRG group (KRG vs placebo; 9.5 ± 4.5 vs 17.6 ± 23.1, P = 0.241). The study suggests that KRG may be effective in protecting subjects from contracting ARI, and may have the tendency to decrease the duration and scores of ARI symptoms.

선박 프로펠러기술의 국내외 연구동향

이창섭,Lee, Chang-Seop 선박안전기술공단 1992 漁船 Vol.52 No.-

캐비테이션 터널의 시운전시험 및 캐비테이션 시험법개발에 관한 연구

이창섭,김기섭,현범수,송인행,Lee, Chang-Seop,Kim, Gi-Seop,Hyeon, Beom-Su,Song, In-Haeng 한국기계연구원 1983 기계연구원소보 Vol.10 No.-

This report includes the general descriptions on the Cavitation Tunnel, newly installed at the Ship Research Station, KIMM, and also on the functions and operating procedures of the major measuring equipments. It also includes the results of the trial operation of the Tunnel and testing techniques in the Cavitation Tunnel.

제주도 한라산조면암의 풍화특성에 관한 연구

이창섭,조태진,이상배,원경식,Lee, Chang-Sup,Cho, Tae-Chin,Lee, Sang-Bae,Won, Kyung-Sik 대한지질공학회 2007 지질공학 Vol.17 No.2

한라산 정상부의 백록담 암체는 백록담조면현무암이 분포하는 동측구역과 한라산조면암이 분포하는 서측구역으로 구분된다. 백록담에서 진행되는 풍화, 암벽붕괴, 낙반은 전반적으로 백록담 서측구역에 분포하는 한라산 조면암의 풍화작용과 밀접한 연관성을 가지며, 동측구역에서는 개별 암석 블록들의 국지적 붕락현상이 발생한다. 본 연구에서는 한라산조 면암 분포지역의 지질학적 및 지형학적 특성을 조사하였으며, 풍화단계별로 조면암 시료를 채취하여 편광현미경분석, X-선 회절분석, 전자현미경관찰, 지화학분석, 공학적 물성시험 등을 수행하였다. 실험결과에 의거하여 한라산조면암의 광물 암석학적 특성변화, 화학적 특성변화와 물리적 특성변화를 분석하였으며, 백록담을 구성하는 조면암체의 풍화특성과 원인을 조사하여 풍화 메커니즘을 고찰하였다. Baeknokdam rock mass at the crest of Halla mountain is composed of Baeknokdam trachybasalt in the eastern region and Hallasan trachyte in the western region. On-going weathering, rockfall and collapse of Baeknokdam wall rock are closely linked to the weathering of trachyte distributed in the western region of Baeknokdam, though within the restricted area of eastern region trachybasalt blocks has been naturally formed and may be rolled down neering properties have been conducted. Based on the results of these experiments variations of mineralogical-petrographical characteristics of trachyte together with chemical and physical properties with respect to the degree of weathering have been analyzed. Weathering mechanism of Baeknokdam trachyte has been delineated by investigating the environmental cause of weathering and the peculiar features of weathered rock mass.

인삼배유세포에 존재하는 단백질체의 분해양상

이창섭,김우갑,Lee, Chang-Seob,Kim, Woo-Kap 한국현미경학회 1994 Applied microscopy Vol.24 No.4

Protein bodies in the endosperm cells of mature red ginseng (Panax ginseng C.A. Meyer) were distributed evenly in the cytoplasm and their size varied from 1 to $8{\mu}m$. Three types of protein bodies were detected and they are spherical or egg-shaped ones containing homogeneous matrix only, spherical ones containing globoids, and irregular shaped ones. Protein bodies degraded in two patterns, one is to start the degration of the body from the surface toward the center, while the other is that the body was broken evenly and then degraded gradually. After degradation, only the limiting membrane remained, that causes the body to be empty. The limiting membranes fused with each other to form a large vacuole. Vicilin and legumin decreased in the endosperm cells as the protein bodies degraded gradually whereas they increased in the umbiliform layers.

에세이 - '2012 대한민국건축사대회' 발대식을 마치고

이창섭,Lee, Chang-Seop 대한건축사협회 2012 建築士 Vol.2012 No.6