• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.2
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• pp.69-76
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• 2005

In this paper partial discharge were simulated by insulation particle which could be easy accumulated charge and concentrated electric field in the model GIS. In this times this paper measured and analyzed the radiated electromagnetic waves by using spectrum analyzer and antenna$(30\~2000(MHz))$ for measurement of$ EMI{\cdot}EMC$ in accordance with occurrence and propagation of partial discharge. This paper suggested the other method of detecting and estimating of partial discharge for insulation diagnosis of GIS being insulation particle by measurement and analysis of radiated electromagnetic waves. From results of this study, it was confirmed that if the suggested method should be used for the diagnosis of insulation in the model GIS being insulation particle, detecting partial discharge and estimating discharge propagation will be possible.

• Journal of Life Science
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• v.18 no.4
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• pp.454-460
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• 2008

This study was carried out to demonstrate morphological, cytological and molecular evidence for intersubgeneric $F_1$ hybrid between Glycine tomentella and G. max cv. ‘Baemkong’. Morphological features of $F_1$ plant for pistil and stamen, flower color and growth habit showed intermediate type between G. tomentella and G. max cv. ‘Baemkong’. Chromosome number of $F_1$ plant was 2n=39, which explained the evidence of $F_1$ hybrid between G. tomentella (2n=38) and G. max cv. ‘Baemkong’ (2n=40). Polyacrylamide isoelectric focusing pattern for esterase and peroxidase also showed that the $F_1$ plant was true $F_1$ hybrid between G. tomentella and G. max cv. ‘Baemkong’. From RAPD analysis, we identified that 62 primers showing bands in $F_1$ hybrid had both bands from G. tomentella and G. max cv. ‘Baemkong’, which suggested that this was true $F_1$ hybrid. Based on our results from morphological, cytological and molecular analyses, we suggest that the $F_1$ plant was true intersubgeneric hybrid between G. tomentella and G. max cv. ‘Baemkong’. Our results still remain us further study to recover fertility of $F_1$ hybrids. The occurrence of maternal and/or paternal inheritance in $F_1$ hybrid from intersubgeneric cross between G. tomentella and G. max cv. ‘Baemkong’ need to be explained.

• Horticultural Science & Technology
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• v.17 no.3
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• pp.352-354
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• 1999

Randomly and specifically amplified polymorphic DNA band patterns based on polymerase chain reaction (PCR) analysis were used to assess genetic variation of somaclonal variants obtained from tissue culture of lisianthus (Eustoma grandiflorum). Five different types of variant were classified by morphological characters such as leaflet number, leaf shape, caulicle length, plant height, and leaf area. Five primers out of 20 primers (10 mer) resulted in 34 random amplified DNA fragments with polymorphisms (64.7%) in all tested plants. The dissimilarity coefficient was from 0.71 to 0.91 by UPGMA cluster analysis. Based on the presence of polymorphic bands, normal plant and five somaclonal variants were divided into two groups at the similarity coefficient value of 0.79.

• Journal of Digital Contents Society
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• v.19 no.9
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• pp.1795-1801
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• 2018

Genome-Wide Association Study (GWAS) have been used to identify susceptibility genes for complex human diseases and many recent studies succeed to report common genetic factors for various diseases. Unfortunately, it is hard to understand all biological functions and mechanisms around the complex disease with GWAS only although the number of known associated genes with diseases is increased drastically because GWAS is a single locus based approach while not a gene but numerous factors may affect a disease associated pathways. PRaDA generates a combined report with genes, pathways and Gene Ontology (GO) using single nucleotide polymorphism (SNP) analysis output. The PRaDA reports not only directly associated pathways but also functionally related ones for identifying accumulated effects of low p-value SNPs. Through integrated information including indirect functional effects, user could have insights of overall disease mechanisms and markers.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.63-63
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• 2012

편광분석법(ellipsometry)은 대상 물질의 유전율 함수의 실수부와 허수부를 Kramers-Kronig 관계식의 도움 없이 그 물질상수를 정확히 측정할 수 있는 매우 우수한 기술이다. 이 기술의 큰 장점 중 하나는 빛의 편광상태의 변화를 이용한 비파괴적인 방법으로써 실시간 측정이 가능하며, 박막의 두께측정의 오차범위는 0.1 nm 이하로써 매우 정확하다는 것이다. 본 연구자는 이러한 우수한 측정 기술인 편광분석법을 고진공의 분자살박막증착장치(MBE) 와 결합하여 AlSb, AlP의 유전율 함수를 측정하였다. Al 계열을 포함하는 반도체 화합물은 Al의 산소친화력이 강해 대기 중에서 순수한 유전율 함수를 얻기가 불가능하다. 하지만 본 연구실에서 초고진공 상태의 MBE 챔버에서 시료를 성장시키는 동시에 실시간으로 편광분석기를 이용하여 측정하였고, 지금까지 발표된 결과들 중 가장 순수한 상태의 AlSb 유전율 함수를 얻어낼 수 있었다. 또한 순수한 AlP의 유전함수를 측정할 수 있었고, 이는 편광분석기를 이용한 최초의 실험결과로써 이차미분을 이용한 전이점 분석결과 이론적인 전자밴드구조에서 E1, E1+${\Delta}1$, E2에 해당하는 밴드갭들을 확인할 수 있었다. 또한 표면의 원자배열 구조와 실시간으로 일어나는 그들의 역학적인 현상들에 관한 정보를 얻을 수 있는 surface photoabsorption (SPA)를 metalorganic chemical vapor deposition (MOCVD)에 장착하여 실시간 모니터링이 가능하도록 하였다. SPA를 이용하여 GaAs/AlGaAs 양자우물구조의 성장을 원자층 수준으로 실시간 모니터링을 할 수 있었다. 그리고 SPA를 이용하여 MOCVD 안에서 InP에 As가 흡착 및 탈착되는 현상을 분석하여, As의 흡착이 두 단계에 의해 이루어짐을 분석하였다. 그리고 편광분석법의 빠르고 정확한 측정 기술을 규칙적인 구조체에서 전자기파의 회절을 구할 수 있는 Rigorous Coupled-Wave Analysis (RCWA) 계산방법과 결합하여 나노구조의 기하학적인 모양을 정확하고 빠르게 구할 수 있었다. 본 연구를 위해 규칙적인 3차원 Si 구조체 제작하여 편광분석기로 측정하고 $SiO_2$와 표면 거칠기를 고려하여 RCWA로 분석한 결과, 규칙적인 Si 구조와 산화막 층까지 정확하게 분석할 수 있음을 확인하였다. 또한 규칙적인 나노구조분석 연구를 넘어 불규칙적인 나노구조에 대한 분석 가능성을 보이기 위해 InAs 양자점을 증착하여 분석하였고, 이를 통해 편광분석법과 RCWA를 이용하여 불규칙적인 나노구조의 모양과 크기, 분포의 분석이 가능함을 보였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.5
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• pp.1-5
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• 2010

This paper deals with a method to measure the thickness of scale-layer, iron oxide formed on the surface of the rolling steel, using a dielectric lens antenna. The dielectric lens antenna has an independent characteristic with the frequency in the X-band and changes the spherical wave radiated from a horn antenna into a plane wave at the focusing point. Using this concept, we regard a scale-layer on the rolling steel as a dielectric-PEC(Perfect Electric Conductor) layer and apply a theoretical analysis of the normal-incident plane wave. To reduce the phase error arising from the use of the dielectric lens antenna, this paper utilizes a regression process algorithm. In comparison with the conventional iteration algorithm, the present algorithm led to a unique solution for the thickness of the scale-layer.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.12
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• pp.1384-1393
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• 2008

In this paper, we analyzed the multilayer structure with lossy metamaterials using ABCD Matrix method to get the transmission characteristics. Compared to the recursive method which cannot be used to analyze the lossy characteristics of multilayer structure because of its complexity, we used the ABCD matrix method is easy to apply because of its matrix chain concepts for arbitrary number of multilayer structure and lossy material. To verify the results of this paper, we used both for multilayer dielectric and metamaterial, respectively, and obtained the same results. Multilayer structure with lossy metamaterial showed minimized ripple and broadband transmission compared to dielectric multilayered structure. This can be used in various applications as antenna radome and shielding material, etc.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.4
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• pp.515-523
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• 2012

In this paper, the resonance characteristics and radiation characteristics of a spherical patch on a dielectric sphere are analyzed. Resonance characteristics can be obtained from the resonant frequency and the quality factor. Radiation characteristics can be also analyzed from the E-field in the far region. In order to calculate these parameters, spectral domain analysis method is applied. Algebraic equation can be obtained in spectral domain through Vector Legendre transform pair and Galerkin's method. So, efficient calculation is possible numerically. It is investigated that radius, curvature of a spherical patch, and dielectric constant of a dielectric sphere have an effect on characteristics of a spherical patch.

• Korean Journal of Optics and Photonics
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• v.19 no.1
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• pp.73-79
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• 2008

We propose a novel metal-waveguide structure for sustaining long-range surface-plasmon-polaritons (LRSPP). The LRSPP waveguides are composed basically of two asymmetric metal layers: a very thin, finite-width metal strip on top of a metal slab with a dielectric gap in between them. Mode cut-off of LRSPPs excited on the double-metal waveguides is characterized by consistently investigating their dispersion relations and mode profiles. We also confirm experimentally the existence of low-loss, well-confined LRSPP modes by measuring far-field outputs emerging from an edge of the asymmetric double-metal waveguides. In the experiment, we have fabricated several types of SPP waveguide devices including straight lines, S-bend, and Y-branch consisting of gold strips (20 nm-thick, $5{\mu}m$-wide). Overall propagation loss of the proposed double-metal waveguides is quite comparable to that of single metal-strip waveguides, in addition the mode sizes can be tuned by increasing the core-insulator gap between the metal layers to get a higher coupling efficiency with a single-mode fiber in telecom wavelength. The proposed LRSPP waveguides may open up realization of SPP-waveguide sensors or nonlinear SPP-devices by replacing the core-insulator with a bio-fluid or a nonlinear medium.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.5 s.120
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• pp.471-477
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• 2007

This paper presents the characteristics of electromagnetic field uniformity in a reverberation chamber with flat diffusers composed of multiple dielectric materials that can be used as an alternative facility for the analysis, test and evaluation of electromagnetic interference and immunity. The field characteristics and the size of the test volume inside the reverberation chamber with the new diffuser of multiple dielectric materials are simulated and analyzed at $2.5{\sim}3$ GHz band. The FDTD method is used to analyze the field characteristics. The field uniformity, polarization characteristics and tolerance are improved by the new diffuser with smaller physical size. The reverberation chamber with flat diffusers composed of multiple dielectric materials shows better electromagnetic performance and larger test volume than normal chamber.