• Metals and materials international
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• v.24 no.6
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• pp.1285-1292
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• 2018

Microstructural properties of as-grown and annealed CoCrFeMnNi high entropy alloy (HEA) oxynitride thin films were investigated. The CoCrFeMnNi HEA oxynitride thin film was grown by magnetron sputtering method using an air gas, and annealed under the argon plus air flow for 5 h at $800^{\circ}C$. The as-grown film was homogeneous and uniform composed of nanometer-sized crystalline regions mixed with amorphous-like phase. The crystalline phase in the as-grown film was face centered cubic structure with the lattice constant of 0.4242 nm. Significant microstructural changes were observed after the annealing process. First, it was fully recrystallized and grain growth happened. Second, Ni-rich region was observed in nanometer-scale range. Third, phase change happened and it was determined to be $Fe_3O_4$ spinel structure with the lattice constant of 0.8326 nm. Hardness and Young's modulus of the as-grown film were 4.1 and 150.5 GPa, while those were 9.4 and 156.4 GPa for the annealed film, respectively.

• KIEE International Transactions on Electrophysics and Applications
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• v.4C no.2
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• pp.39-44
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• 2004

The present paper gives a review of the recent development of a differential mobility analyzer (DMA) available for both particle size measurements and production of monodisperse particles in the nanometer range. Operating principles of a general DMA are introduced as well as characteristics of highly functional DMAs such as those capable of classifying particles in a measurement range as broad as 1-1000nm at low pressures. Some examples of DMA applications are also described.

• Proceedings of the Korean Magnestics Society Conference
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• 2007.05a
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• pp.280.2-280.2
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• 2007

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2002.10b
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• pp.49-50
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• 2002

Rapid advancements in analytical instrumentations and techniques in the last several decades offer an unprecedented opportunity to analyze the complex chemistry and probe the surfaces for chemical evidence. Recent developments in nanotechnology provide further ability to examine phenomena and mechanisms at the nanometer level. As a result of these advances, our understanding of the complex lubrication system has improved significantly. This paper will attempt to provide a molecular basis of how lubricant and additives function in lubrication.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.7 no.3
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• pp.81-86
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• 2008

I present a 3-D profiler specially devised for the profile measurement of specular surfaces that requires precision shape accuracy up to a few nanometer. A profile is reconstructed from the curvature of a test part of the surface at several locations along a line. The local curvature data are acquired with White-light Scanning Interferometry. Test measurement proves that the proposed profiler is well suited for the specular surface inspection like precision mirror.

• Proceedings of the Korea Concrete Institute Conference
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• 1999.10a
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• pp.671-674
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• 1999

With increasing content of granulated blase furnace slag in cement, the content of capillary pores in the mortar decreases and later age strength of the concrete. Therefore, this provides greater reserves study is carried out to estimate frost resistance of high-strength concrete specimens with water cement ratios using blast-furnace slag. 1. Blast furnace concrete is comparatively more good frost resistance than normal concrete. 2. As the blast furnace slag increases, the quantity of pores with a radius of more than 30nanometer decreses.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1993.10a
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• pp.493-498
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• 1993

This paper proposes a high precision measurement technique to obtain the height of gage block. The proposed technique is consisted of two steps : In the first step, laser position transducer and electric micrometer are adopted to obtain a coarse value of the height of gage block, and then, second, heterodyne laser interferometry is adopted to acquire the precision value. The experiment results show that accuract in the order of a few nanometer is achieved for the gage blacks of as high as a few millimeter.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2007.06a
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• pp.15-18
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• 2007

As the line width of the pattern become thin more and more, the accuracy of ultra-precision stage should be increased. Various type stages have been developed and used in fabrication phase and inspection lab. Furthermore the line with become several tens of nanometer recently. We need ultra high precision stage. In this paper a new type stage is proposed in order to reduce the deformation of working table. The table is supported by several flexure hinges and actuated by a PZT. The local deformation is analyzed and the vibratory motion is also examined by FEM package.

• Proceedings of the Polymer Society of Korea Conference
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• 2006.10a
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• pp.193-193
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• 2006

Fluorescent dyes were encapsulated in the nanometer-sized diblock copolymer micelles to control the fluorescence resonance energy transfer. Since acceptor molecules and donor molecules were effectively isolated in the independent micelles, the energy transfer between donors and acceptors was suppressed by the site isolation, leading to the simultaneous emission from both donor and acceptor molecules.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.276-279
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• 2003

The phase change upon reflection from target surfaces in white-light interferometer induces measurement errors when target surfaces are composed of dissimilar materials. We prove that this phase change on reflection considered of the polarization of the white-light causes the shift of both envelope peak position and fringe peak position of several tens of nanometer. In addition, we propose a new equation of white-light interference fringe pertinent to the polarization of source.