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뫼스바우어 분광법과 색도 분석에 의한 고대 고려청자의 발색메카니즘 연구
전아영,노형구,김응수,조우석,김경자,김종영,김진모,김철성,강경인,Jeon, A-Young,No, Hyung-Goo,Kim, Ung-Soo,Cho, Woo-Seok,Kim, Kyung-Ja,Kim, Jong-Young,Kim, Chin-Mo,Kim, Chul-Sung,Kang, Gyung-In 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.1
In ancient Goryeo celadon, the effect of the chemical composition and ionic state of Fe on the color was evaluated by Mossbauer spectroscopy and Design of Experiment (DOE) analysis. The ancient celadon pieces excavated from the kiln sites in GangJin and Buan areas were analyzed by Mssbauer spectroscopy, chromaticity, and DOE analysis. The color of celadon was found to be mainly determined by that of glaze since variations of $L^*$, $a^*$, and $b^*$ values for the body were much smaller than those for the glaze. As $Fe^{2+}$/$Fe^{3+}$ in glaze increases, $L^*$ value increases, whereas $a^*$/$b^*$ value decreases, which is well consistent with the result on the synthetic glaze. As the amount of titanium increases in the glaze, the $a^*$ and $b^*$ values decrease; on the other hand, the $L^*$ value increases, which is well consistent with the result on the synthetic glaze.
CAE 해석을 이용한 FRP시험편의 사출금형설계에 대한 최적화 연구
김종우(Jong Woo Kim),정도연(Do Yeon Jung),김진호(Jin Ho Kim),김철인(Chul In Kim),최태종(Tae Jong Choi),김연직(Yon Jig Kim),임재규(Jae Kyoo Lim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this paper, CAE analysis and manufacturing of plastic injection molding using fiber reinforced plastics(FRP) were performed for tensile test specimen. ASTM for plastic tensile specimen was applied to design and prevent an injection mold from external impact damage. Injection molding experiments with variations of injection speed, temperature, pressure and weld line were performed and then carbon fiber reinforced polycarbonate specimens was also performed. as a result, how to optimize mold design and connect systematically all of processes from mold design to manufacturing through the efficient use of CAE analysis in development process.
탄소섬유강화 폴리카보네이트의 탄소섬유 함유량에 따른 파괴인성에 관한 연구
김진호(Kim jin ho),오이슬(Oh yi seul),김상범(Kim sang beom),김철인(Kim chul in),임재규(Lim jae kyoo) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this study, the fracture toughness and the properties of microscopic structure of CFRP produced by injection molding was investigated by universal testing instrument and SEM in the rate of carbon fiber quantity and the weld line. we can obtain each fracture characteristic by performing the strength evaluation of polymer composite material according as carbon fiber ratio of carbon fiber reinforced polycarbonate and weld line.
La⅔Sr⅓MnO₃ / SiO₂ / Si(100) 박막의 저-자장 터널형 자기저항변화의 두께 의존성
심인보(In-Bo Shim),안성용(Sung-Yong An),김철성(Chul Sung Kim) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.3
Polycrystalline thin films of La⅔Sr⅓MnO₃(LSMO) were prepared by water-based sol-gel processing on thermally oxidized Si(100) substrate. The thickness dependence of the low-field tunnel-type magnetoresistance properties at room temperature was studied. Tunnel-type magnetoresistance at low-field is found to be strongly dependent on film thickness. Maximum value of tunnel-type magnetoresistance of LSMO thin films was appeared at the film thickness of ~1500 Å. This behavior can be explained in terms of dead layer between LSMO thin film and Si(100) substrate and thermal lattice strain effect in the LSMO thin films.
KFeO<sub>2</sub> 분말의 제조 및 뫼스바우어 분광학 연구
문승제,심인보,김철성,Moon, Seung-Je,Shim, In-Bo,Kim, Chul-Sung 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.1
단일상의 $KFeO_2$ 분말을 ball-mill법을 이용하여 제조 하였다. 결정학적 및 자기적 성질을 x-선 회절법, 중성자 회절 실험, 뫼스바우어 분광법으로 연구 하였다. x-선 및 중성자 회절실험 분석 결과 $KFeO_2$ 시료의 결정구조는 격자상수 $a_0=5.557{\AA},\;b_0=11.227{\AA},\;c_0=15.890{\AA}$을 갖는 단일상의 orthorhombic구조로 분석 되었다. 또한 시간변화에 따른 $KFeO_2$의 강한 흡습성으로 인한 급격한 변화를 확인할 수 있었다. 뫼스바우어 스펙드럼 결과 1 set(6-line)으로 분석되었다. 극저온(4.2 K)과 상온에서의 초미세자기장값(hyperfine field)은 각각 519, 489 kOe이었으며, 이성질체 이동치(isomer shift)는 0.19, 0.05 mm/s로 나타났다. $KFeO_2$의 스핀과 여기에 의한 T/Tc<0.7 이하의 초미세자기장 $H_{hf}(T)$의 변화는 $[H_{hf}(T)-H_{hf}(0)]/H_{hf}(0)=-0.16(T/Tc)^{3/2}-0.25(T/Tc)^{5/2}$로 얻어졌다. The crystallographic and magnetic properties of $KFeO_2$ powder prepared by ball-mill method, have been studied by x-ray diffraction(XRD), $M\"{o}ssbauer$ spectroscopy, and vibrating sample magnetometer(VSM) measurements. The crystal structure of $KFeO_2$ powder at room temperature is determined to be an orthorhombic structure of Pbca with its lattice constants $a_0=5.557{\AA},\;b_0=11.227{\AA},\;c_0=15.890{\AA}$ by Rietveld refinement. $M\"{o}ssbauer$ spectra of $KFeO_2$ were taken at various temperatures ranging from 4.2 to 818 K. The magnetic hyperfine field and isomer shift value at 4.2 K and RT were 519 kOe, 489 kOe and 0.19 mm/s, 0.05 mm/s respectively. The average hyperfine field $H_{hf}(T)$ of the $KFeO_2$ shows a temperature dependence of $[H_{hf}(T)-H_{hf}(0)]/H_{hf}(0)=-0.36(T/T_N)^{5/2}$ for $T/T_N$<0.7, indicative of spin-wave excitation.