RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제
      • 좁혀본 항목 보기순서

        • 원문유무
        • 원문제공처
        • 학술지명
        • 주제분류
        • 발행연도
          펼치기
        • 작성언어
        • 저자
          펼치기

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • Fabrication of in-situ Fiber Composite from Thermotropic Poly(ester amide) and Polycarbonate

        Jho, Jae Young 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-

        열방향성 poly(ester amide) (상품명 Vectra)와 열가소성 polycarbonate(상품명 Lexan)로부터 장섬유 복합재료를 제조하였다. 액정고분자인 Vectra는 낮은 용융점도로 인해 가공조제인 동시 복합재료의 분산상으로 사용되었으며, 장섬유를 형성할 경우 높은 탄성률로 인해 보강재의 역할을 할 수 있을 것으로 기대되었다. Vectra가 장섬유를 형성할 수 있는 재료 및 압출성형의 인자들을 체계적으로 조사하였으며, 그 결과로부터 섬유상의 형성과정을 유추, 제안하였다.

      • 건자재용 저온-고효율 원적외선 복사재료의 연구

        양중식 慶熙大學校 材料科學技術硏究所 1996 材料科學技術硏究論集 Vol.9 No.-

        The purpose of this study is to develop the radiators using construction materials in the long wavelenghs such as the far IR at low temperatures. In order to extend to emissivity range of the far IR of the materials and also improve the radiation properties of ceramic substances. The radiants for far IR radiation which are on use in the domestic buildings are investig-ated, and these characteristic values are compared with each other. The conditions for the proper mixed ratio of inorganic cements and ceramic materials of silicate system were added as the binding agents such as portland cements and alumina gel. The results obtained are summarized as follows; Emission properties of the sintered clay specimen by penetrating of carbon black and transitional metals at 900℃ for 2 hours was obtained higher than using cements, basalt and silicon carbide main materials and addition of powdered glass, CuO and MnO_(2) ingredients as active materials.

      • 고순도 단백질 재료 분리를 위한 Lysozyme 농도분석에 관한 연구

        김운수,김우식,김용욱 慶熙大學校 材料科學技術硏究所 1995 材料科學技術硏究論集 Vol.8 No.-

        In this study the lysis reaction of lysozyme to Micrococcus lysodeikticus cell(ML cell) was investigated to develop the quick and accurate assay technique for lysozyme concentration. For the investigation of the lysis reaction of lysozyme the Michaelis-Menton(M-M) reaction mechanism was applied and Lineweaver-Burk plot was used to calculate the reaction rates. The concentration of lysozyme and ML cell were changed from 2.0 to 10.0mg/l and from 10 to 50mg%, respectively. In these range of concentrations of the lysozyme and ML cell the lysis reaction was good agreement with M-M reaction mechanism and then the maximum reaction constant and Michaelis-Menton constant were measured as 1.40×10^(-2) and 11.08, respectively. These information on the lysis reaction contributes to the better analysis of lysozyme concentration in comparison with conventional procedure.

      • Electronic Structure of Si(111)-(7x7) Surfaces

        Lim, Hunhwa 慶熙大學校 材料科學技術硏究所 1994 材料科學技術硏究論集 Vol.7 No.-

        First principle ab initio 계산에 의한 Si(111)-7×7 표면의 재구조가 Takayanagi 등이 제안한 DAS model로 기술될 수 있음을 보였다. 표면의 unit cell 에서 short diagonal에 대한 asymmetry STM image를 얻었고 이는 다른 계산등과 일치되는 결과들임을 보일 수 있었다.

      • 에너지 동등개념을 이용한 복합재료 회전익의 탄성, 전단중심의 결정에 관한 연구

        유용석,서현석,김규로,최명진,오택열 慶熙大學校 材料科學技術硏究所 1995 材料科學技術硏究論集 Vol.8 No.-

        Modern helicopter rotor blades with non-homogeneous cross section which are made from anisotropic material require highly sophisticated structural analysis. Variation in cross section geometry make this task of analysis more complicated. The dynamic and static behavior of rotor blades is mainly influenced by the cross sectional properties, which depend upon the coordinates of the shear center and elastic center as well as bending and shear stiffness. The material can be homogeneous or non-homogeneous, isotopic or anisotropic. By comparing the results of this numerical approximation for cross sections with known exact solutions, it can be seen that a simple method to determine the cross sectional properties of composite helicopter blades is presented based on the elementary beam theory.

      • Basalt 및 Alumina Cement로된 원적외선 방사재료의 방사특성

        梁重植 慶熙大學校 材料科學技術硏究所 1995 材料科學技術硏究論集 Vol.8 No.-

        The purpose of this investigation was to prepare far-infrared radiant by ceramics made from using a domestic basalt as starting material mixed with a high alumina cement as ceramic binder. The characteristics of far-infrared radiation on the several kinds of the mixed materials, without heatreted and the treated compounds, were studied. These results revealed that the basalt mixed with CaO-Al₂O₃ cement increase in the emissive intensity were detected in the sample dried at 110℃ than the samples sintered at 1,100℃. And the radiants consists of the basalt with CaO-Al₂O₃ cement increased in wavenumbers 1000-1200cm^(-1). The effect of the emissive intensity suggest that the sample shifted to lower wavenumber with the increase in content of alumina contained in the compound.

      • 복합재료회전익의 단면특성에 관한 연구

        유용석,서현석,최명진,오택열 慶熙大學校 材料科學技術硏究所 1994 材料科學技術硏究論集 Vol.7 No.-

        Modern helicopter rotor blades with non-homogeneous cross section which are made from non-isotropic material require highly sophisticated structural analysis. Variation in cross section geometry make this task of analysis more complicated. The dynamic and static behavior of rotor blades is mainly influenced by the cross sectional properties, which depend upon the coordinates of the shear center and elastic center as well as the bending and shear rigidity. In this study, a simple method to determine the cross sectional properties of composite helicopter blades is presented based on the elementary beam theory.

      • 복합재료 회전익의 진동에 관한 연구

        유용석,서현석,최명진,오택열 慶熙大學校 材料科學技術硏究所 1994 材料科學技術硏究論集 Vol.7 No.-

        In helicopter blade design, it is essential to get the accurate dynamic characteristics of the composite helicopter rotor blades including natural frequencies and mode shapes, which determine the susceptibility of the rotor system to aeroelastic instability and large vibratory response. In this study, the dynamic characteristics of helicopter rotor blades are investigated with various composite material twisted cross sections, ply angles, and rotation speed.

      • 기판 종류와 전처리 방법에 따른 선택적 구리 박막 특성

        곽성관,김동식,정관수 慶熙大學校 材料科學技術硏究所 1999 材料科學技術硏究論集 Vol.12 No.-

        First, four different substrates, Si, SiO_(2), WN, and TiN, were used to examine the Cu deposition mechanism at the substrate surface. The initial stages of nucleation, density and grain size of the Cu thin film were investigated by performing the deposition at substrate temperatures ranging from 150 to 220℃ with a deposition time of 1 min. The results showed an increase in the Cu nuclei size with increasing deposition temperature for all four substrates. More specifically, WN and TiN substrates showed particle sizes at low temperature (150℃) which were significantly larger than for Si and SiO_(2) substrates nuclei sizes. Selective Cu deposition was achieved by depositing a TiN layer on a SiO_(2) substrate followed by patterning, thus creating two separate SiO_(2) and TiN surfaces. In order to study selective factors of Cu thin films, after SC1 cleaning, HF treatment and passivation treatment of the substrate, we have investigated deposition properties of selective Cu thin films. According to the pretreatment methods of the substrate surface, it showed very sensitive selective deposition properties from the experiment's result. Thus, from the above result, though Cu dry echting technique at room temperature is not yet developed, we could get some possibility to use Cu as semiconductor metallization.

      • A Study on Characterization of Asphalt Pavement Materials Through Resilient Modulus Test

        Rhee, Suk-Keun 慶熙大學校 材料科學技術硏究所 1995 材料科學技術硏究論集 Vol.8 No.-

        포장 재료의 특성시험으로 가장 합리적인 시험법인 회복탄성계수 (Mg) 시험에 의한 아스팔트 포장 재료의 특성을 조사하였다. 이 회복탄성계수 시험법은 하중을 반복적으로 재하제재하하므로써 실제 도로가 받는 하중상태를 재현한 시험법이다. 입상재료에 대해서는 반복재하 삼축압축시험을 AASHTO T274 시험법에 따라 실시하였고, 아스팔트 재료에 대해서는 ASTM D4123 시험법에 따라 반복재하 간접인장 시험을 통하여 실시하였다. 실내시험 결과 입상재료의 비선형 회복탄성거동이 관찰되었으며, 체적응력과 축차응력이 회복탄성계수의 변화에 가장 주요한 변수임을 알 수 있다. 아스팔트 재료에 대하여는 회복탄성계수는 온도의 변화에 매우 민감하여 log M_(R) 이 온도에 선형 반비례함을 알 수 있다. 또한 본 연구에서 제안된 구성모델에 의해 예측된 회복탄성계수값이 실내시험 결과와 잘 일치함을 알 수 있다.

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼