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일방향 응고법을 이용한 Mar M-247LC 초내열합금의 액상 물성 측정
김현철,이재현,서성문,김두현,조창용,Kim, Hyeon-Cheol,Lee, Jae-Hyeon,Seo, Seong-Mun,Kim, Du-Hyeon,Jo, Chang-Yong 한국재료학회 2001 한국재료학회지 Vol.11 No.9
Directional solidification experiments have been carried out at the solidification rates from 0.5 to 50$\mu\textrm{m}$/s in Mar M-247LC superalloy in which several important liquid properties were estimated by analyzing the interface stability and temperature gradient at the solid/liquid interface. The diffusion coefficient in the liquid was estimated by employing the constitutional supercooling criterion. The temperature gradients changed with solidification rates and latent heat of solidification. The thermal conductivities of solid and liquid could be estimated by heat flux balance at the solid liquid interface.
플라즈마 화학증착법으로 제조된 B-doped a-SiC:H 박막의 물성
김현철,신혁재,이재신,Kim, Hyeon-Cheol,Sin, Hyeok-Jae,Lee, Jae-Shin 한국재료학회 1999 한국재료학회지 Vol.9 No.10
$SiH_4$, $CH_4$, $B_2H_6$ 혼합기체를 이용하여 플라즈마 화학증착법으로 탄화실리콘 (a-SiC:H) 박막을 증착하였다. 증착중에 혼합기체중의$CH_4$농도 ($CH_4/CH_4+SiH_4$)를 변화시켜 얻은 박막의 물성을 SEM, XRD, Raman 분광법, FTIR, XPS, 광흡수도와 광전도도 분석을 통하여 살펴보았다. $SiH_4$기체만 이용하여 증착한 Si:H 박막은 비정질상태를 나타내었으나, $CH_4$가 첨가됨에 따라 실리콘 박막의 Si-$\textrm{H}_{n}$(n은 정수) 결합기가 Si-$\textrm{C}_{n}\textrm{H}_{m}$ (n,m은 정수) 형태의 결합기로 변화되었으며, 박막내 수소함량은 $CH_4$농도가 0~0.8의 범위에서 증가함에 따라 30~45% 범위에서 증가하였다. 반응기체중의 $CH_4$농도의 증가에 따라 박막 내의 탄소 농도가 증가함을 확인하였으며, 이에 따라 막의 전기비저항과 광학적밴드갭 역시 증가하였다. B-doped hydrogenated amorphous silicon carbide (a-SiC:H) thin films were prepared by plasma-enhanced chemical-vapor deposition in a gas mixture of $SiH_4$, $CH_4$ and $B_2H_6$. Microstructures and chemical properties of a-SiC:H films grown with varing the volume ratio of $CH_4$ to $SiH_4$ were characterized with various analysis methods including scanning electron microscopy(SEM), X-ray diffractometry(XRD), Raman spectroscopy, Fourier-transform infrared (FTIR) spectroscopy. X-ray photoelectron spectroscopy(XPS), UV absorption spectroscopy and photoconductivity measurements. While Si:H films grown without $CH_4$ showed amorphous state, the addition of $CH_4$ during deposition enhanced the development of a microcrystalline phase. By introducing C atoms into the film, Si-Si and Si--$\textrm{H}_{n}$ bonds of a -Si:H films were gradually replaced by Si-C, C-C, and Si--$\textrm{C}_{n}\textrm{H}_{m}$ bonds. Consequently, the electrical resistivity and optical bandgap of a-SiC:H films were increased with the C concentration in the film.
방사선 검사 관련 의료장비와 PACS 간의 연동을 위한 DICOM 및 Non-DICOM 인터페이스 방안
김현철,Kim, Hyeon-Cheol 대한디지털의료영상학회 2002 대한디지털의료영상학회논문지 Vol.5 No.1
This thesis describes the effective interfacing methods of PACS Modality based on the system installation and operating experiences. PACS(Picture Archiving and Communication Systems) is a system for medical image archiving and communication using large storage device and high-speed network. The standard communication protocol of PACS is DICOM(Digital Imaging and Communication in Medicine) based on TCP/IP and point-to-point protocol. However, there are many Non-DICOM Modalities and DICOM Modalities having problems. First, we had interfaced almost modalities, Fuji CR, GE CT, MRI, Angio, Fluoro, Phillips Angio, Shimadzu Fluoro, Ultrasound PACS, with the main PACS in the Seoul S Hospital as large scale hospital. And we manipulated the intelligent image distribution and the CT, MRI Interfaces never experienced before in the Anyang J Hospital and the Chungju C Hospital as mid or small scale hospital. Technically, we developed both the DICOM Interface and the Non-DICOM Interface. At the last, the DICOM Worklist and the DICOM Print Interface were implemented in the Seoul B Hospital, the Bucheon SJ Hospital and the Seoul K Hospital independently with PACS. The Oracle, Sybase and MS-SQL are used as database, and UNIX, Macintosh, MS Windows as operating systems. And the Visual C++ and UNIX C are the main programming tools. We have used UTP, coaxial and fiber optic Gable under 10/100 mbps LAN for networking.