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방사선 검사 관련 의료장비와 PACS 간의 연동을 위한 DICOM 및 Non-DICOM 인터페이스 방안
김현철,Kim, H.C. 대한디지털의료영상학회 2003 대한디지털영상기술학회지 Vol.6 No.1
This thesis describes the effective interfacing methods of PACS Modality based on the system installation andoperating 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 beforein 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 cable under 10/100 mbps LAN for networking.
연속주조용 탄소강에서 상변화에 따른 열팽창 및 수축 거동
김현철,이재현,권오덕,임창희,Kim, H.C.,Lee, J.H.,Kwon, O.D.,Yim, C.H. 한국재료학회 2003 한국재료학회지 Vol.13 No.3
The air gap between the metal and mold, formed by shrinkage during solidification, causes surface and subsurface cracks in the continuous casting process. Molten crack on the surface might also occur due to improper heat transfer between them. In order to compensate the air gap in mold design, the thermal contraction is an essential factor. In this study, the thermal contraction and expansion behaviors were examined from the ($\alpha$ and pearlite)/${\gamma}$ to ${\gamma}$/$\delta$ transformations in continuous casting steels by the commercial dilatometer and the self- assembled dilatometer with laser distance measurement. It was found that the thermal contraction and expansion behaviors were very dependant on the phase transformation of the ${\gamma}$/$\delta$ as well as ($\alpha$ and pearlite)/${\gamma}$. The sudden volume change from $\delta$ to ${\gamma}$ which might cause cracks in the continuous casting process, was observed on cooling just below the melting temperature by the self-assembled dilatometer.
Ti-6A1-4V 합금의 피로거동에 미치는 온도 , 주파수 및 미세조직의 영향
김현철(H. C. Kim),김승한(S. H. Kim),임병수(B. S. Lim),김두현(D. H. Kim),이용태(Y. T. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.1
The effect of temperature, frequency and microstructure on fatigue crack propagation property of Ti-6Al-4V alloy has been investigated. Teh temperatures employed were room temperature, 200°C and 400°C. The frequencies were 20Hz and 8Hz. The microstructures tested were equiaxed and bimodal microstructures. Mechanical properties and fatigue crack growth rates were measured in different test conditions. From the experimental results, following conclusions were obtained.1) Bimodal microstructure showed superior fatigue crack growth resistance to equiaxed microstructure.2) Under all test conditions, fatigue crack growth rate increased with test temperature.3) Wine the frequency decreasing from 20Hz to 8Hz, fatigue crack growth rate increased.
Ti-3Al-2.5V 합금의 고온피로에 미치는 온도 및 미세조직의 영향
김현철(H. C. Kim),임병수(B. S. Lim) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.3
To detennine the effect of temperature and microstructure on the fatigue crack propagation behavior in Ti-3Al-2.5V alloy, experimental investigations have been carried out with the specimens of different temperatures and different volume fractions of prime<br/> a -phase. The temperatures employed were room temperature, 200°C, 300°C and 400°C under the same frequency of 20Hz. To obtain the different volume fractions of the primary a -phase, specimens were solution - treated at a + i3 and above the i3 region.<br/> From the experimental results, following conclusions were obtained. (1) L1 Kth was observed to increase with the less volume fraction of the primary a -phase. (2) As the temperature increased the da/dN became greater while the material constant, m, decreased as temperature increased. (3) Microstructures having more primary a -phase showed higher strength at the high temperatures.<br/>