• Journal of the Korea Institute of Military Science and Technology
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• v.15 no.6
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• pp.779-785
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• 2012

In this paper, we have analyzed the curvature effects of the finite FSS(frequency selective surface) using the 3-D method of moment using the BiCGSTab algorithm as an iterative method. To validate the analysis method in this paper, we compared the RCS(radar cross section) of PEC(perfect electric conductor) sphere with theoretical results and it shows well agreements. The tripole slot FSSs which have many application in military were selected for the investigation of curvature effect and RCS as a frequency characteristics were observed with the variation of the curvature rate. Simulation results shows that curvature effect can significant effect the passband frequency and bandwidth of FSS. We suggest that the curvature effect must be considered at the stage of design FSS application like FSS radome.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.119-120
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• 2004

A study on the selective adsorption of uranium(VI) from a high concentration of chemical salts has tern peformed to investigate the uranium removal mechanisms and the application conditions of the electrosorption technique using the activated carbon fiber(ACF) as a good conductive electrosorption adsorbent. Electrosorption test were carried out using an electrochemical cell.(omitted)

• Analytical Science and Technology
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• v.13 no.4
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• pp.544-547
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• 2000

By using surface modified activated alumina with AI(III) and flame atomic absorption spectrometry, a rapid and convenient method for the selective analysis of chromium (III) and chromium (VI) in water has been developed. This technique appears to work accurately under optimum pH range from 3 to 5.

• Proceedings of the KIEE Conference
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• 1995.07c
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• pp.1025-1027
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• 1995

SEG(Selective Epitaxial Growth) and ELO(Epitaxial Lateral Growth) of Silicon offer new opportunities in the fabrication of MEMS(Micro Electro-Mechanical Systems) structures. SEG of silicon enables the stacking of junctions in addition to those resulting from the standard bipolar process and this properly was utilized for the fabrication of an improved-performance color sensor. When the crystalline growth takes place through the seed windows and proceeds over the dielectric, after reaching the surface, it form an ELO silicon layer and this ELO-Si can be modified into various structures for MEMS application such as cantilevers, beams, diaphragms.

• Special Issue of the Society of Naval Architects of Korea
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• 2017.10a
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• pp.54-58
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• 2017

The vessels which are operated in ECA (Emission Control Area) after $1^{st}$ January 2016 shall be complied with revised NOx emission requirement (Tier III). Effective solutions for NOx emission requirement are SCR (Selective Catalytic Reduction), EGR (Exhaust Gas Recirculation) and Installation of LNG Dual Fuel Engine. This study is considered the design modification as per application of LNG Ready notation. In case of LNG Ready - S notation, the vessel shall be retrofitted the Main engine with Dual fuel engine and LNG Fuel system after delivery. On this paper, the entire process for design modification was explained to meet the requirement for LNG Ready notation.

• Transactions of the Korean hydrogen and new energy society
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• v.30 no.3
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• pp.289-295
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• 2019

Effects of various reaction factors such as pressure, time, and temperature on clathrate formation were investigated for hydroquinone with $CO_2$ and $N_2$. Experimental and spectroscopic results indicate that $CO_2$ plays more preferential role in forming hydroquinone clathrates than $N_2$. These results can be used in application of selective $CO_2$ separation from flue gases with the formation of clathrate compounds.

• Journal of Korea Multimedia Society
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• v.10 no.11
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• pp.1417-1426
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• 2007

As one of schemes to protect multimedia content. it is the selective encryption scheme to encrypt partially multimedia content. Compared AES(advanced encryption standard) of traditional encryption, the selective encryption scheme provides low security but is applicable to applications of multimedia content not to require high secrecy. In this paper, we improve the image scrambling scheme proposed by Van De Ville which scrambles an image without bandwidth expansion using DPSS(discrete prolate spheroidal sequence) to make it more secure based on Shujun's research which verifies the secrecy of Van De Ville's scheme. The proposed method utilizes an orthonormalized random matrix instead of Hadamard matrix for secret matrix and to add it for providing high secrecy against statistical attack or known-plaintext attack using some statistical property or estimate of secret matrix from a scrambled image. The experimental results show that the proposed method is more secure than the existing scheme. In addition, we show that the proposed method can be applied to access control or copy control of watermarking application.

• Korean journal of applied entomology
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• v.23 no.3 s.60
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• pp.166-171
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• 1984

The present studies were conducted to investigate the relative toxicity of several insecticides to the rice insect pests and the predatious spider, Pirate subpiraticus. In laboratory test by topical application, BPMC and MIPC for the plant and leafhoppers were toxic to Nilaparvata lugens, but less toxic to Pirata subpiraticus. Other carbamate insecticides such as carbaryl, carbofuran, and MTMC showed highly toxic effect on P. subpiraticus as well as N. lugens. No organophosphates showed selective toxicity to P. subpiraticus. Thiocyclam, effective to Chilo suppressalis and Sesamia inferens, had highly good selective toxicity to P. subpiraticus. In case of insecticides for Nephotettix cincticeps, BPMC only had a little selective toxicity between N. cincticeps and P. subpiraticus. Organophosphate insecticides which had been reported to induce chemical resistance to N. cincticeps showed high $LD_{50}$ value to N. cincticeps. In pot trials, dust formulation was more toxic to P. subpiraticus than emulsifiable concentrate. It was more toxic to P. subpiraticus to increase number. of insecticide application.

• The Journal of the Korean life insurance medical association
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• v.22
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• pp.23-29
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• 2003

• Proceedings of the Materials Research Society of Korea Conference
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• 1993.11a
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• pp.18-18
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• 1993