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Song, K.J.,Ko, R.K.,Kim, H.S.,Ha, H.S.,Ha, D.W.,Oh, S.S.,Park, C.,Yoo, S.-I.,Kim, M.W.,Kim, C.J.,Joo, J.H. Institute of Electrical and Electronics Engineers 2007 IEEE transactions on applied superconductivity Vol.17 No.2
<P>The degree of ferromagnetism of Ni-W<SUB>y</SUB> alloys decreases as W-content y increases. Both the saturation magnetization <I>M</I> <SUB>sat</SUB> and Curie temperature <I>T</I> <SUB>c</SUB> decrease linearly with W-content y, and both <I>M</I> <SUB>sat</SUB> and <I>T</I> <SUB>c</SUB> go to zero at critical concentration of y<SUB>c</SUB> ~9.50 at.% W. To compare with Ni-W alloys, the magnetic properties of a series of both as-rolled (non-textured) and annealed (biaxially textured) [Ni<SUB>97at.%</SUB>-W<SUB>3at.%</SUB>]<SUB>100-x</SUB>-Cu<SUB>x</SUB> alloy tapes with compositions x = 0, 1, 3, 5, and 7 at.%, were studied. Characterization methods included XRD analyses to investigate the biaxial texturing of the annealed [Ni-W]-Cu alloy tapes and studies of the magnetization for both as-rolled and annealed [Ni-W]-Cu alloy tapes. Both the isothermal mass magnetizations <I>M</I>(<I>H</I>) of a series of samples at different fixed temperatures and <I>M</I>(<I>T</I>) in fixed field, were measured. The effect of Cu addition on both the saturation magnetization and Curie temperature T<SUB>c</SUB> of the Ni<SUB>97at.%</SUB>-W<SUB>3at.%</SUB> alloy was investigated.</P>
Kim, S.W.,Kwon, S.,Park, S.I.,Lee, C.,Cho, D.L.,Lee, H.J.,Ko, K.,Kim, S.J. Universitetsforlaget ; Elsevier Science Ltd 2016 Lithos Vol.262 No.-
<P>The Cretaceous tectonomagmatism of the Korean Peninsula was examined based on geochemical and geochronological data of the Cretaceous plutonic rocks, along with distribution of volcano-sedimentary nonmarine N- to NE-trending fault bounded sedimentary basins. We conducted sensitive high-resolution ion microprobe (SHRIMP) zircon U-Pb ages and whole-rock geochemical compositions of 21 Cretaceous plutonic rocks, together with previously published data, from the central to southern Korean Peninsula. Four age groups of plutonic rocks were identified: Group I (ca. 119-106 Ma) in the northern to central area, Group II (ca. 99-87 Ma) in the central southern area, Group III (ca. 85-82 Ma) in the central to southern area, and Group IV (ca. 76-67 Ma) in the southernmost area. These results indicate a sporadic trenchward-younging trend of the Cretaceous magmatism in the Korean Peninsula. The Group I, II, and III rocks are dominated by high-K calc-alkaline I-type rocks with rift-related A-type granitoids. In contrast, the Group IV rocks are high-K calc-alkaline I-type plutonic rocks with no A-type rocks. The geochemical signatures of the entire groups indicated LREEs (light rare earth elements) enrichments and negative Nb, Ta, and Ti anomalies, indicating normal arc magmatism. A new tectonic model of the Cretaceous Korean Peninsula was proposed based on temporal and spatial distribution of the Cretaceous plutons represented by four age groups; 1) magmatic quiescence throughout the Korean Peninsula from ca. 160 to 120 Ma, 2) intrusions of the I- and A-type granitoids in the northern and central Korean Peninsula (Group I plutonic rocks from ca. 120 to 100 Ma) resulted from the partial melting of the lower continental crust due to the rollback of the Izanagi plate expressed as the conversion from flat-lying subduction to normal subduction. The Gyeongsang nonmarine sedimentary rift basin in the Korean Peninsula and adakite magmatism preserved in the present-day Japanese Islands supported the slab rollback followed by steepening of the Izanagi plate with an injection of upwelling of the hot asthenosphere into the mantle wedge. 3) Alternating shallow (from similar to 100 to 85 Ma) to steep (from similar to 85 to 65 Ma) subduction resulted in the migration of the normal arc magmatism in the southern Korean Peninsula, expressed as the intruded I- and A-type (Group III) and I-type granitoids (Group IV), respectively. The tectonomagmatism of, the Korean Peninsula showed the unique style of evolution, different from those of South China and Japanese Islands. (C) 2016 Elsevier B.V. All rights reserved.</P>
무기태린 공급제의 이용성에 관한 연구 4 . MAP 의 첨가수준이 면양의 성장 , 영양소이용율 , 혈액성분에 미치는 영향
한인규(I . K . Han),하종규(J . K . Ha),고종열(J . Y . Ko),이기웅(K . U . Lee),이돈우(D . W . Lee) 한국축산학회 1987 한국축산학회지 Vol.29 No.1
Present study was conducted to compare effects of various levels of monoammonium phosphate (MAP) in promoting the growth of lambs, to determine nutrient digestion influenced by MAP levels, and to examine the effect of MAP levels on blood parameters. Various levels of dietary phosphorus were added to experimental diet with monoammonium phosphate. Four levels of MAP used in lamb trial were 0%, 0.4%, 0.8% and 1.2%. Feeding trial as well as metabolic trial and determination of blood parameters were conducted. Results obtained are summarized as follows. 1. Of the four MAP levels used in lambs studies, 0.4% MAP resulted in the best body weight gain. 2. Total feed intake and feed efficiency in sheep fed 0.4% MAP appeared to be higher than those fed 0%, 0.8%o and 1.2%, but differences were not significant. 3. Values of blood Ca, P and urea were erratic and no consistent trends were observed. 4. Increasing MAP levels in sheep diets did not significantly influence nutrient digestibilities and nitrogen retention.
MG Prabagar,Y Do,S Ryu,J-Y Park,H-J Choi,W-S Choi,TJ Yun,J Moon,I-S Choi,K Ko,K Ko,C Young Shin,C Cheong,Y-S Kang 한국당과학회 2013 한국당과학회 학술대회 Vol.2013 No.1
Complements, such as C1q and C3, and macrophages in the splenic marginal zone (MZMs) play pivotal roles in the efficient uptake and processing of circulating apoptotic cells. SIGN-R1, a C-type lectin that is highly expressed in a subpopulation of MZMs, regulates the complement fixation pathway by interacting with C1q, to fight blood-borne Streptococcus pneumoniae. Therefore, we examined whether the SIGN-R1-mediated classical complement pathway plays a role in apoptotic cell clearance and immune tolerance. SIGN-R1 first-bound apoptotic cells and this binding was significantly enhanced in the presence of C1q. SIGN-R1-C1q complex then immediately mediated C3 deposition on circulating apoptotic cells in the MZ, leading to the efficient clearance of them. SIGN-R1-mediated C3 deposition was completely abolished in the spleen of SIGN-R1 knockout (KO) mice. Given that SIGN-R1 is not expressed in the liver, we were struck by the finding that C3-deposited apoptotic cells were still found in the liver of wild-type mice, and dramatically reduced in the SIGN-R1 KO liver. In particular, SIGN-R1 deficiency caused delayed clearance of apoptotic cells and aberrant secretion of cytokines, such as TNF-α, IL-6, and TGF-β in the spleen as well as in the liver. In addition, anti-double- and single-stranded DNA antibody level was significantly increased in SIGN-R1-depleted mice compared with control mice. These findings suggest a novel mechanism of apoptotic cell clearance which is initiated by SIGN-R1 in the MZ and identify an integrated role of SIGN-R1 in the systemic clearance of apoptotic cells, linking the recognition of apoptotic cells, the opsonization of complements, and the induction of immune tolerance.
Cutting Force of Ultrasonic Vibration-assisted Milling for Titanium Alloys
T. J. Ko(고태조),G. C. Park(박건철),R. Kurniawan(쿠르니아완 렌디),M. K. Choo(추민기),M. R. Xu(쉬모란),P. W. Han(한필완),I. J. Yoon(윤인준),Y. I. Kwak(곽예인) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Titanium alloys have great characteristics such as strong corrosion resistance, high strength-weight ratio and heat resistance. This material has been used in aviation and aerospace industries due to their superior properties. However, titanium alloys are a representative difficult-to-cut material. Ultrasonic vibration-assisted milling (UVAM) is a more effective machining method with noteworthy advantage such as prolongs tool life, low cutting force, good surface quality for difficult-to-cut material compared to the conventional milling (CM) method. In this paper, the cutting force on the titanium alloy was investigated by applying both the UVAM and CM method with the spindle rotational speed variation. As a result, the UVAM showed that the cutting force was lower than that of the CM, especially in the higher spindle rotational speed. The UVAM cutting force was decreased maximally for all cutting force components (Tangential : -11.2, Radial : -10.6, Axial : -9.1%) at 8,000 rpm spindle rotational speed.