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음향방출 신호처리에 의한 플라즈마용사코팅 피막부식재의 파손해석
김귀식,박경석,홍용의,현창해 제주대학교 산업기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.1
This paper was to investigate of a adhesiveness of the plasma sprayed coating materials did a salt spray by acoustic emission method in tensile loading. The powders used for the coating were nickel aluminum composite powder Ni-4.5wt.%Al and titanium dioxide powder TiO2. These powders were coated on a carbon steel S45C by plasma spray method. The salt solution was a 5% NaCl and the salt spray times were 2, 5 and 10 hours respectively. The salt solution penetrated into the surface of the substrate through pore of the coating layer built in the process of plasma spay. Corrosion productions formed on the surface of substrate. The adhesiveness between the substrate and the coating layer is weaken by corrosion and the exfoliation initiated chiefly at the corrosion surface of the substrate. The AE events and energy of the corroded coating specimens decreased as the salt spray times increased. The AE amplitudes increased at strain range of 6%-11%.
AE에 의한 플라즈마 용사코팅 염수분무 부식재의 인장해석
김귀식,박경석,홍용의,현창해 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2
Thermal spray coating is formed by a process in which melted particles flying with high speed towards substrate, then crash and spread on the substrate surface cooled and solidified in a very short time. Stacking of the particles makes coating. This paper was to investigate the adhesiveness of the plasma sprayed coating materials conducted 5% NaCl salt spray by acoustic emission method in tensile loadings. The powders used for the coating were nickel aluminum composite powder Ni-4.5wt.%Al and titanium dioxide powder TiO_2. The salt solution penetrated into the surface of the substrate through pore of the coating layer built in the process of plasma spray. Corrosion productions formed on the surface of substrate. The adhesiveness between the substrate and the coating layer is weaken by corrosion and the exfoliation initiated chiefly at the corrosion surface of the substrate. The AE events and energy of the corroded coating specimens decreased as the salt spray times increase.
심명화,정홍석,김창석,백승우,안도희,이민수,김광락,임성팔 한국공업화학회 2005 응용화학 Vol.9 No.1
The main purpose of fusion fuel supply system is to store and supply hydrogen isotopes needed for operation of ITER and to provide the necessary infrastructure for short and long term storage of large amount of hydrogen isotopes. The storage of tritium as metal tritide on hydride forming metals or intermetallic compounds is recognized as the most reliable and safe method. Considering the advantages and disadvantages of several hydrogen isotope getter materials, the authors suggest the use of ZrCo on the basis of its ideal P-T-C characteristics and its non pyrophoricity. The authors also suggest the hydrogen isotope storage beds design appropriate to the fusion fuel supply system.
MRAM Technology for High Density Memory Application
Kim, Chang-Shuk,Jang, In-Woo,Lee, Kye-Nam,Lee, Seaung-Suk,Park, Sung-Hyung,Park, Gun-Sook,Ban, Geun-Do,Park, Young-Jin The Institute of Electronics and Information Engin 2002 Journal of semiconductor technology and science Vol.2 No.3
MRAM(magnetic random access memory) is a promising candidate for a universal memory with non-volatile, fast operation speed and low power consumption. The simplest architecture of MRAM cell is a combination of MTJ(magnetic tunnel junction) as a data storage part and MOS transistor as a data selection part. This article will review the general development status of MRAM and discuss the issues. The key issues of MRAM technology as a future memory candidate are resistance control and low current operation for small enough device size. Switching issues are controllable with a choice of appropriate shape and fine patterning process. The control of fabrication is rather important to realize an actual memory device for MRAM technology.
Conceptual design of HCCR-TBM diagnostics
Kim, Chang-Shuk,Ku, Duck Young,Ahn, Mu-Young,Lee, Youngmin,Hong, Seong Pyo,Kang, Bo Sun,Cho, Seungyon Elsevier 2018 Fusion engineering and design Vol.136 No.1
<P><B>Abstract</B></P> <P>The design of diagnostics system for the Helium Cooled Ceramic Reflector (HCCR) Test Blanket System (TBS) has now progressed from generic approaches to the conceptual design integration phases. It is proposed to monitor the temperature, strain, magnetic field strength and neutron flux in selected positions of the corresponding Test Blanket Module (TBM). The temperature can be measured by thermocouple sensors to be integrated for the first wall and breeding zones of TBM. The strain will be monitored by appropriate gauges on the first wall of TBM. Several magnetic pick-up coils could be installed to measure magnetic field strength inside the TBM structure. For the neutron flux monitoring, pairs of Neutron Activation System (NAS) probes and Micro-Fission Chambers (MFCs) would be installed in the TBM structure. In this paper, a brief description on the proposed diagnostics system as well as the key components is presented, and the integration challenges of HCCR TBS diagnostics system are outlined.</P>
Cheon MunSeong,Kim Chang-Shuk,Cho Seungyon,Krasilnikov V. 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.7
Due to the harsh radiation, thermal, and electromagnetic environment of the irradiation end of the ITER neutron activation system, which also forms a primary vacuum boundary and a nuclear safety confinement boundary simultaneously, installing a capsule detection sensor at this location, which is essential for reliable operation of the system is extremely challenging. Alternative capsule detection methods utilizing sensors located in more benign environments are investigated experimentally in this study. The experimental result suggests that a simultaneous measurement of the pressure and the acoustic/vibration wave will provide reliable information on the capsule arrival at the irradiation end.
Shim, Ki-Shuk,Kim, Taesoo,Ha, Hyunil,Cho, Chang-Won,Kim, Han Sung,Seo, Dong-Hyun,Ma, Jin Yeul Hindawi Publishing Corporation 2012 Evidence-based Complementary and Alternative Medic Vol.2012 No.-
<P>Hwangryun-haedok-tang (HRT) is the common recipe in traditional Asian medicine, and microbial fermentation is used for the conventional methods for processing traditional medicine. We investigated the inhibitory effect of the <I>n</I>-butanol fraction of HRT (HRT-BU) and fHRT (fHRT-BU) on the RANKL-induced osteoclastogenesis in bone-marrow-derived macrophages. mRNA expression of osteoclastogenesis-related genes were evaluated by real-time QPCR. The activation of signaling pathways was determined by western blot analysis. The marker compounds of HRT-BU and fHRT-BU were analyzed by HPLC. The inhibitory effect of HRT or fHRT on ovariectomy-induced bone loss were evaluated using OVX rats with orally administered HRT, fHRT (300, 1000 mg/kg), or its vehicle for 12 weeks. fHRT-BU significantly inhibited RANKL-induced osteoclastogenesis, and phosphorylation of p38, IKK<I><I>α</I></I>/<I><I>β</I></I>, and NF-<I><I>κ</I></I>Bp65 compared to HRT-BU. In addition, fHRT-BU also significantly inhibited the mRNA expression of Nf<I><I>κ</I></I>b2, TNF-<I><I>α</I></I>, NFATc1, TRAP, ATPv0d2, and cathepsin K. Furthermore, administration of fHRT had a greater effect on the increase of BMD, and greater improved bone microstructure of the femora than that of HRT in ovariectomy rats. This study demonstrated that bacterial fermentation enhances the inhibitory effect of HRT on osteoclastogenesis and bone loss. These results suggest that fermented HRT might have the beneficial effects on bone disease by inhibiting osteoclastogenesis.</P>