• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.730-732
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• 2007

We fabricated a coplanar type organic thin-film transistors using ink-jet printed silver source/drain electrodes and ${\alpha},{\omega}-dihexylquaterthiophene$ (DH4T) which is an active layer. Use of ink-jet printed silver nanoparticle-based metal electrode assists the energetic mismatch with p-type organic semiconductor via modification of their interfacial properties to enable ohmic contact formation.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.482-488
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• 2017

Recently, weapon system has been highly regarding IM ability. Explosive is positively necessary in weapon system and it is principle component that must be improved for IM as the most hazardous material. RDX is one of energetic materials used the most at present since 1930s. It is being applied a lot to most of explosive in warhead and artillery and rocket propellants in these latter days due to its low cost and high energetic characteristics. However, it has a disadvantage which is more sensitive than some insensitive explosive like NTO, DADNE recently developed. To overcome this, researches have been continued about insensitive RDX and we are performing the study as well. In this study, we developed to apply reduced sensitivity RDX to pilot scale and mass production and we could confirm a result by shock sensitivity test.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2012.05a
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• pp.124-125
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• 2012

Korea institute of materials science (KIMS) use a linear deposition source called as a closed drift linear plasma source (CDLPS) as well as dual magnetron sputtering (DMS) to deposit SiOxCyHz films in $HMDSO/O_2$ plasma. The CDLPS generates linear plasma using closed drifting electrons and can reduce device degradations due to energetic ion bombardments on organic devices such as organic photovoltaic and organic light emission diode by controlling an ion energy. The deposited films are investigated by Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). Optical emission spectroscopy (OES) is used to measure relative radical populations of dissociation and recombination products such as H, CH, and CO in plasma. And SiOx film is applied to a barrier film on organic photovoltaic devices.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.698-701
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• 2011

Over recent several years, researches for the less sensitive gun propellant development have been carried out with promising the product of propellants which have temperature independent characteristics using the new energetic plasticizing mixture as Di-nitro-diaza-alkanes. During this study, the promising propellant formulation having temperature ballistic properties as well as better behaviors concerning the cold brittleness of the materials was confirmed by results in tests of a closed bomb and 40mm Gun firing. On-going research on the optimized shape, formulation and processes of the propellant is progressing. From now on it should be done present study to establish the better composition and processes.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2002.05a
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• pp.46-46
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• 2002

It is well known that thin film growth and surface morphology can be substantially modified by ion-bombardment during the deposition. This is particularly important in case of thin-film deposition at low temperatures where the film growth occurs under highly nonequilibrium conditions. An attractive way to promote crystalline growth and surface morphology is deposition of additional energy in to the surface of the growing film by bombardment with hyperthermal particles. We were deposited crystalline Ti and TiN thin films on Si substrate by magnetron sputtering method with grid. Its thin films were highly smoothed and dense as increasing grid bias. In order explore the benefits of a bombardment of the growing film with high energetic particles. Ti and TiN films were deposited on Si substrates by an unbalanced magnetron sputter source with attached grid assembly for energetic ion extraction. Also, we have studied the variation of the plasma states by Langmuir probe and Optical Emission Spectroscopy (OES). The epitaxial orientation. microstructual characteristics. electrical and surface properties of the films were analyzed by XRD. SEM. Four point probe and AFM.

• Journal of the Korean institute of surface engineering
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• v.39 no.2
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• pp.76-81
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• 2006

Molecular dynamics simulations were carried out to investigate physical sputtering of Fe(100) substrate due to energetic ion bombardments. Repulsive interatomic potentials at short internuclear distances were determined with ab initio calculations using the density functional theory. Bohr potentials were fitted to the ab initio results on diatomic pairs (Ar-Fe, Fe-Fe) and used as repulsive screened Coulombic potentials in sputtering simulations. The fitted-Bohr potentials improve the accuracy of the sputtering yields predicted by molecular dynamics for sputtering of Fe(100), whereas Moliere and ZBL potentials were found to be too repulsive and gave relatively high sputtering yields. In spite of assumptions and limitations in this simulation work, the sputtering yields predicted by the molecular dynamics method were in fairly good accordance with the obtainable experimental data in absolute values as well as in manner of the variation according to the Incident energy. Threshold energy for sputtering of Fe(100) substrate was found to be about 40 eV. Additionally, distributions of kinetic energies of sputtered atoms and their original depths could be obtained.

• Bulletin of the Korean Chemical Society
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• v.33 no.2
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• pp.373-374
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• 2012

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.305-307
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• 2014

Pyroprocessing (or pyrometallurgy) is the way of extracting from materials subjected to high temperatures. Generally, this process has a high energy consumption because of mass production and heating-up. To attain effective and efficient energy management, energetic analysis using 0-dimensional model is usually conducted. However, this model can lead to a misunderstanding about energy evaluation due to many assumptions and limitations. In this study, heat & mass balance using 0-dimensional model was reviewed to systematize problems and considerations in general process energy evaluation.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2007.04a
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• pp.349-352
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• 2007

In this paper, we describe the modeling of ablation based laser applications for innovative use in the military In the laser ignition system, a metal confinement is ablated with the high intensity pulsed energy, triggering a thermal ignition of the confined high explosives. The constitutive equations for the laser source, deformation of metals, and explosion of energetic materials are described.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1998.06a
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• pp.481-483
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• 1998

The problem of production of new materials based on polyheteroarylenes and other polymers combining good mechanical and dielectric properties. radiation and chemical stability with heat- and thermal stability is related with the development of efficient synthesis technique of starting low-molecular compounds. Alicyclic dianhydrides are believed to be the promising monomers to synthesize various polymers.