• 제목/요약/키워드: Choi Je-woo

검색결과 268건 처리시간 0.105초

초산균체 추출물의 In Vitro계 암세포 증식 억제 효과 (Cytotoxic Effect of the Extract from Acetobacter aceti OLS-001)

  • 이병우;유익제;유무영;황우익;최춘언
    • 한국식품과학회지
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    • 제27권4호
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    • pp.445-448
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    • 1995
  • Acetobacter aceti OLS-001 균체에서 추출한 추출물의 농도가 높을수록, 배양시간이 길수록 암세포의 증식 억제 효과가 높게 나타났으며, 현미경 관찰에서 본래의 암세포 형태가 변형되고 세포막사이의 경계막이 흐트러지면서 사멸하는 현상을 나타냈다.

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지하철역사내 측정위치별 PM-10 및 중금속 농도특성에 관한 연구 (A study of PM-10 and Heavy Metal characteristics in the air at the each site of a subway station.)

  • 장정욱;조장제;최우건;박덕신;정우성;김태오
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2003년도 추계학술대회 논문집(III)
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    • pp.389-394
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    • 2003
  • Subway has been used one of major public transportations because of overpopulation and heavy traffic problems in the metropolitan areas. So, the air pollution has been serious. In this study, continuous date of PM-10 (particles with aerodynamic diameter < $10{\mu}m$) and heavy metal concentration measurements for winter, spring and summer. These measurements have been carried out in the outdoor, concourse, platform, tunnel. The study results showed that the average seasonally concentration of PM-10 particles were $141.57{\mu}g/m^3$ in winter. $129.34{\mu}g/m^3$ in spring and $122.73{\mu}g/m^3$. The average concentration of PM-l0 particles at indoor higher than outdoor. The concentration of Fe, Cu, showed the largest peak concentrations during the respective season.

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GIS를 이용한 송지호 재첩서식의 적지선정 (Suitability Selection on Habitable Environments of Corbicula Japonica in the Songji Lagoon by GIS)

  • 최유길;우영배;어재선;최철재;윤홍주
    • 한국전자통신학회논문지
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    • 제10권9호
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    • pp.965-972
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    • 2015
  • 본 논문은 송지호 재첩서식의 적지선정을 위한 방법에 대해 살펴본다. 수차례에 걸쳐 현장탐사와 시료채취를 통한 수질검사로 수집된 자료를 지리정보시스템(GIS)을 이용하여 분석하였다. 송지호의 재첩 서식환경의 특성을 파악하기 위해 수온, 염분, 용존산소 농도, PO4-P 농도를 활용하였다. 본 연구는 서식환경이 유사한 여타 석호 등에서 재첩 증식의 기초자료로 활용할 수 있을 것으로 기대된다.

나노분말이 첨가된 변압기 절연유 제조 및 정적열전특성 평가 (Synthesis and Characterization of Transformer Oil containing Nanoparticles)

  • 송현우;최철;최경식;오제명
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
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    • pp.49-52
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    • 2004
  • New hydrophobic alumina nanoparticles were synthesized from alumina powders which were hydrophilic nano-agglomerates with diameters from ${\mu}m$ to mm by surface modification. The synthesized hydrophobic alumina nanoparticles which were retreated with Oleic acid were analyzed by Fourier transform infrared spectrophotometer and transmission electron microscopy. Then transformer oil containing surface-modified alumina naonparticles were synthesized. The synthesized hydrophobic alumina nanoparticles were well-dispersed in transformer oil. The coefficient of viscosity and dielectric strength of the Nano-transformer oil were investigated with viscometer and high voltage experiment device. In this study, the thermal conductivity of Nano-transformer oil was investigated to reduce the oil temperature of transformer by transient hot-wire method.

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인체-화기시스템의 인체충격특성에 관한 연구 (A Study on Human Body Impact Characteristics of the Human-rifle System on Shooting)

  • 이영신;이장원;최영진;채제욱;최의중;김인우
    • 한국정밀공학회지
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    • 제23권7호
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    • pp.159-167
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    • 2006
  • The impact time history of human body with K2 rifle on stand shooting posture is analyzed and compared with experimental results. Analysis model is Korean 50% tile of twenties and height, weight is 174 cm, 62 kgf respectively. The muscle and bone human model of Korean man's twenties 50% tile is applied. ADAMS program is used for kinematic analysis and human model is developed by Life Mod program. The effect of the ground support condition, grip position and human weight factor are studied. Maximum impact force of shoulder is 784 N. The horizontal displacement of K2 rifle muzzle is 2.9 cm.

자율 주행형 급수 배관 검사 (An automatic motorized feeder pipe inspection robot)

  • 최창환;전풍우;최용제;정승호;김승호
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.816-821
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    • 2004
  • The outlet feeder pipe thinning in a PHWR (Pressured Heavy Water Reactor) is caused by high pressure steam flow inside the pipe, which is a well known degradation mechanism called FAC (Flow Assisted Corrosion). In order to monitor the degradation, the thickness of the outlet bends closed to the exit of the pressure tube should be measured and analyzed at every official overhaul. This paper develops an automatic feeder pipe inspection system that can minimize the irradiation dose by automating the measurement process. The robot can move by itself on the feeder pipe by using an inch worm mechanism, which is constructed by two gripper bodies that can fix their body on the pipe and one extendable and retractable body connected the two gripper bodies to move forward and backward.

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아파치 웹서버의 URL 공격에 대한 보안취약성 분석 (Analysis of a Security Vulnerability of URL Attack on Apache Web Server)

  • 최종천;최진우;조성제
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2004년도 춘계학술발표대회
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    • pp.1027-1030
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    • 2004
  • 본 논문에서는 기계어 프로그램만 주어진 환경에서 디버깅 및 역공학 도구를 사용하여 소프트웨어 보안취약성을 분석하는 방법에 대한 연구를 수행하였다. 즉, MS사의 윈도우즈 2000 서버 운영체제 상에서 아파치(Apache) 웹서버를 대상으로, URL 공격에 대한 한 취약성을 재연하고, 취약점이 있는 코드 부분을 추출하였다. 이는 기계어 프로그램을 실행하면서 보안 취약성 분석 절차를 이해하고 보안 결함을 발견해 내는 기반 자료로 활용될 수 있을 것이다.

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