• 한국자기학회:학술대회 개요집
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• 한국자기학회 1999년도 춘계연구발표회 논문개요집
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• pp.24-25
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• 1999

• 한국진공학회:학술대회논문집
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• 한국진공학회 2003년도 제25회 학술발표회 초록집
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• pp.151-151
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• 2003

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2015년도 자성 및 자성재료 국제학술대회
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• pp.94-94
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• 2015

• 한국자기학회:학술대회 개요집
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• 한국자기학회 1998년도 추계연구발표회 논문개요집
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• pp.58-59
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• 1998

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2005년도 동계학술연구발표회 및 2차 아시안포럼
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• pp.223-223
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• 2005

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2005년도 하계학술연구발표회 논문개요집
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• pp.27-27
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• 2005

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2003년도 하계학술연구발표회 및 한.일 공동심포지엄
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• pp.162-163
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• 2003

• 폴리머
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• 제29권2호
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• pp.156-160
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• 2005

Octamethylcyclotetrasiloxane$(D_4)$과 1,3,5-trimethyl-1,3,5-triphenylcyclotrisiloxane$(D_3^{Me,Ph)$을 1,1,3,3-tetramethyl-1,3-divinyldisiloxane(MVS)과 평형중합시켜 실리콘의 Si원자에 dimethyl 및 methylphenyl기가 도입된 $\alpha,\omega-vinyl$ poly(dimethyl-methylphenyl) siloxane prepolymer(VPMPS)를 제조하였으며, 또한 $D_4$와 1,3,5-trimethylcyclotrisiloxane$(D_3^:Me,H})$을 1,1,3,3-tetramethyldisiloxane(MS)와 평형중합시켜 Si원자에 dimethyl 및 methylhydrogen기가 도입된 $\alpha,\omega-hydrogen$ poly (dimethyl-methyl) siloxane prepolymer(HPDMS)를 제조하였다. Poly(acrylic acid)(PAA)을 chelating agent로 하여 nickel(II) nitrate와 iron(III) nitrate를 솔-젤 방법으로 PAA 금속염을 제조하고 이틀을 소결시켜 nickel ferrite 나노 입자를 제조하였다. 제조한 nickel ferrite는 XRD 패턴으로 확인하고 입자의 크기를 TEM으로 측정하였다 1,3-Divinyltetramethyldisilazane(VMS)으로 표면처리한 나노 실리카, nickel ferrite, VPMPS, HPDMS 및 촉매를 고속 교반기에 가하고 $130^{\circ}C$에서 컴파운딩하여 poly(organosiloxane) rubber nanocomposites를 제조하였다. Nickel ferrite 함유한 nanocomposite, POX-30과 POX-50을 각각 제조하였으며 이들의 기계적 및 열전도 특성 그리고 체적 저항을 측정하였다.

• Structural Engineering and Mechanics
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• 제64권3호
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• pp.361-379
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• 2017

In this article, the vibration behavior of double-bonded sandwich microplates with homogeneous core and nanocomposite facesheets reinforced by carbon nanotube and boron nitride nanotube under multi physical fields such as 2D magnetic and electric fields is investigated. Symmetric and un-symmetric distributions of nanotubes are considered for facesheets of sandwich microplates such as uniform distribution and various functionally graded distributions. The double-bonded sandwich microplates rest on visco-Pasternak foundation. Material properties of sandwich microplates are obtained by the extended rule of mixture. The sinusoidal shear deformation theory (SSDT) is employed to describe displacement fields of sandwich microplates. Also, the dimensionless natural frequency is obtained by classical plate theory (CPT) and compared with the obtained results by SSDT. It can be seen that the obtained dimensionless natural frequencies by CPT are higher than SSDT. In order to study the material length scale parameters, modified strain gradient theory at micro scale is utilized and then, the equations of motion are derived using Hamilton's principle. The effects of different parameters such as foundation parameters including Winkler, shear layer and damping coefficients, various distributions and volume fraction of nanotubes, core to facesheet thickness ratio, aspect and side ratios on the dimensionless natural frequencies are discussed in details. The results of present work can be used to optimum design and control of similar systems such as micro-electro-mechanical and nano-electro-mechanical devices.

• Journal of Magnetics
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• 제9권4호
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• pp.101-104
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• 2004

The crystallization behaviours of nanocomposite made by a function of quenching rate (roller speed) were studied. The results showed that there was one step c$\mathbb{r}$ystallization process for the alloy quenched at roller speed of 32 m/s, which could be shown as, Am (amorphouse) + ${\alpha}-Fe/Nd_2Fe_{14}B$ ${\rightarrow}$ ${\alpha}-Fe/Nd_2Fe_{14}B$ . For the alloy quenched at roller speed of 40 m/s, there was steps crystallization process taking place at different temperatures, which could be shown as, Am ${\rightarrow}$ ${\alpha}-Fe/Nd_2Fe_{23}B_3+Nd_2Fe_{14}B+Am`$ ${\rightarrow}$ ${\alpha}-Fe/Nd_2Fe_{14}B$. The presence of transition phase ($Nd_2Fe_{23}B_3$) was harmful to get fine and uniform grain size during crystallization process. Uniform microstructures and high magnetic properties could be attained for the as-quenched alloy containing less amorphous phase and no presence of transition phase during annealing treatment. For the alloy prepared at roller speed of 32 m/s, the following properties were obtained, $B_r= 0.904 T,_iH_c = 801 kA/m, (BH)_{max} = 122 kJ/m^3 and M_r/M_s = 0.6$.