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Spark plasma sintering에 의한 Ti-6Al-4V 합금분말의 성형성
김재호,이진규,김택수,Kim, J.H.,Lee, J.K.,Kim, T.S. 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.1
Using spark plasma sintering process (SPS), Ti-6Al-4V alloy powders were successfully consolidated without any contamination happened due to reaction between the alloy powders and graphite mold. Variation of microstructure and mechanical properties were investigated as a function of SPS temperature and time. Compared with hot isostatic pressing (HIP), the sintering time and temperature could be lowered to be 10 min. and $900^{\circ}C$, respectively. At the SPS condition, UTS and elongation were about 890 MPa and 24%, respectively. Considering the density of 98.5% and elongation of 24%, further improving the tensile strength would obtain by increasing the SPS pressure.
김재호,김창기,김태정,전주일,유정주,홍진우,Kim, J.H.,Kim, C.K.,Kim, T.J.,Jeon, J.I.,Yoo, J.J.,Hong, J.W. 한국전자통신연구원 2012 전자통신동향분석 Vol.27 No.6
스마트TV와, 스마트폰, 스마트 패드뿐만 아니라 다양한 가전 또한 컴퓨팅 기능과 네트워크 기능을 가져 스마트 가전으로 진화할 것으로 예상된다. 또한, 사용자는 스마트TV를 중심으로 다양한 스마트 장치를 연결하여 방송과 통신, 웹, 홈 네트워크가 결합된 멀티스크린 서비스를 요구하고 있다. 본고에서는 스마트TV 기반 멀티스크린 서비스에 필요한 적응형 콘텐츠 부호화 기술과 콘텐츠 전송을 위해 다중 네트워크를 동시에 이용하는 하이브리드 네트워크 스트리밍 기술, 웹 또는 홈 네트워크 환경에서 콘텐츠 및 서비스의 발견 및 제어 기술에 대해서 살펴본다.
김재호 ( K. J. Kim ),임정현 ( J. H. Rhim ),노수영 ( S. Y. No ),문병수 ( B. S. Moon ),김주영 ( J. Y. Kim ),강경균 ( K. G. Kang ) 한국분무공학회 1999 한국액체미립화학회지 Vol.4 No.4
Spray angle, a parameter which is most commonly used to evaluate. spray distribution, is important because it affects the axial and radial distribution of the fuel. Spray angles were measured and compared for the pintle-type gasoline fuel injector with n-heptane as a test fuel with the three different measuring techniques, i.e. digital image processing, shadowgraphy and spray patternator, respectively. Fuel was injected with the injection pressures of 0.2-0.35MPa into the room temperature and atmospheric pressure environment. In digital image processing method, the transmittance level greatly influences the spray angle with the axial distance from the injector. From the experimental results by the shadowgraphy technique, it is obvious that the spray angle vary during the injection period. The results of spray angle from the spray patternator show that there exist the different spray angles in the different areas. The spray angles increase with the increase in the injection pressure for the three measurement techniques considered in this study. The spray angle is widely different, especially in the near region from the injector, according to the measurement techniques used in this experimental work.
토카막 장치에서 자석 구조물의 조립에 관한 검토 KSTAR TF
김경민(K.M.Kim),최창호(C.H.Choi),홍권희(K.H.Hong),양형렬(H.L.Yang),유인근(I.K.Yu),허남일(N.I.Her),사정우(G.H.Kim),김학근(S.T.Kim),김근홍(H.T.Kim),김상태(J.S.Yang),김홍택(J.S.Bak),양진석(C.H.Kim),박주식(P.Z.Shick),김재호(J. Z. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
TF magnet structures are the main structural components in the KSTAR magnet systems to protect<br/> the superconducting coils from mechanical, electrical, and thermal loads. TF coil structure supports CS<br/> and PF coil system. The inter-coil structure contains adjustable shear keys and conical bolts to provide<br/> pre-loading in toroidal direction and to resist against in-plane and out-of-plane forces that are the most<br/> critical loads on the TF magnet system. The conical bolts and shear keys are specially designed to<br/> assemble easily and to provide a convenient accommodation for a good alignment. The connection plate<br/> that is one of the prototype fabrications had been manufactured to study adjustability of conical bolts<br/> and shear keys for assembly of TF coil structure. We could measure the misalignments at the keyways<br/> and conical holes with the misalignment measuring instrument.