• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.188-189
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• 2000

1차원 자성 포토닉 결정은 결함 층으로 삽입된 자성 층에 빛이 국재화되어 거대한 자기광학 효과를 나타낸다. 그 구조를 적절하게 설계하면 원하는 파장에서 거대한 자기광학 효과와 큰 투과율을 얻을 수 있다는 점에서 주목을 받고 있다. [1] 본 연구에서는 (A/B)$_{k}$ M/(A/B)$_{k}$ 의 구조를 갖는(여기서 A는 SiO$_2$, M은 Bi:YIG) 1차원 자성 포토닉 결정에 대해 B유전체 층의 굴절율을 변화시켰을 때의 투과율(T), 페러데이 회전각 ($ heta$$_{F}$ ), 성능지수(Q)를 수치 해석한 결과를 보고한다. (중략)

• BMB Reports
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• v.54 no.10
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• pp.489-496
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• 2021

Chromatin has highly organized structures in the nucleus, and these higher-order structures are proposed to regulate gene activities and cellular processes. Sequencing-based techniques, such as Hi-C, and fluorescent in situ hybridization (FISH) have revealed a spatial segregation of active and inactive compartments of chromatin, as well as the non-random positioning of chromosomes in the nucleus, respectively. However, regardless of their efficiency in capturing target genomic sites, these techniques are limited to fixed cells. Since chromatin has dynamic structures, live cell imaging techniques are highlighted for their ability to detect conformational changes in chromatin at a specific time point, or to track various arrangements of chromatin through long-term imaging. Given that the imaging approaches to study live cells are dramatically advanced, we recapitulate methods that are widely used to visualize the dynamics of higher-order chromatin structures.

• Korean Journal of Optics and Photonics
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• v.14 no.2
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• pp.142-145
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• 2003

The nonreciprocal phase shift characteristics of infinite slab optical waveguides with magneto-optic materials in the cladding layer was calculated at 1.55 ${\mu}{\textrm}{m}$ for optical isolators. The infinite slab waveguide structures considered in this paper were as follows. rho magneto-optic materials used as a cladding layer were Ce:YIG and LNB(LuNdBi)$_3$(FeAl)$_{5}$)$_{12}$,). Their specific Faraday rotations Θ$_{F}$ are 4500$^{\circ}$/cm, 500$^{\circ}$/cm at wavelength 1.55 ${\mu}{\textrm}{m}$ respectively. The guiding layer with multi-quantum well structure was used, and it consists of 1.3Q and InGaAs. In order to investigate the effect of evanescent field penetrating the cadding, layer, guiding mode characteristics were calculated for the cases when the substrate is InP and air. We calculated the minimum lengths of 90$^{\circ}$ nonreciprocal phase shifters and their optimum guiding layer thicknesses in various optical waveguide structures.res.s.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.3 s.106
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• pp.229-238
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• 2006

In this paper, developed study about isolator that after design and optimizes center strip to use 3-D simulator. We use the factor about the change and propose simple mode of the simulation. Design strip line that center frequency is 1.85 GHz by software that use 3-D finite element method(FEM) and confirmed variable. Developed isolator were shown that more than isolation 25 dB, reflection loss has the more than 25 dB and insertion loss does not 0.2 dB. We could confirm that compare with simulation and manufacture sample propertied agrees more than 90 %.

• Proceedings of the Korean Magnestics Society Conference
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• 2017.05a
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• pp.165-166
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• 2017

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.14 no.5
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• pp.193-198
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• 2004

Using the $PbO-B_2O_3-Bi_2O_3$ flux system, $(TbBi)_3(FeAIGa)_5O_{12}(TbIG)$, $(EuBi)_3(FeAIGa)_5O_{12}(EuIG)$ and $(EuTbBi)_3(FeAIGa)_5O_{12}(EuTbIG)$ films were grown on $(GdCa)_3(GaMgZr)_5O_{12}(SGGG)$ substrates by the liquid phase epitaxy (LPE). The saturation magnetization of the grown TbIG, EuIG and EuTbIG films was about 150, 950 and 125 Oe, respectively. The TbIG films resulted in the single magnetic domain while the EuIG and EuTbIG films were observed to be the multi magnetic domains by magnetic force microscope (MFM).

• Journal of the Korean Institute of Telematics and Electronics
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• v.22 no.3
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• pp.43-47
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• 1985

This paper describes fiber-optic current sensor using SF-4 flint glass for the first time, ails the flint glass has been theoretically analyzed by jones matrix and experimentally verified. Verdet constant of SF-4 flint glass, which determines the sensitivity of current sensor, has been experimentally found as 0.0606(min/g.cm). It is relatively lower value than currently used faraday rotators such as FR-5, SF-6 flint glasses and YIG. The fiber.optic current sensor system was established and the current measurement was performed in the range of 100-600 (A) and 100- 500 (G). It has beenfhown by the experi-mental results that the detector output linearly increased in proportion to the current. Since these experimental results were in good agreement with theoretical results, it has been shown that SF-4 flint glass can be used for the magnetooptic current sensor.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.5
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• pp.1026-1033
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• 2007

This paper compared simulation characteristics on the design of center strip by structure simulator with manufacture of 2.6GHz non-reciprocal element. Secures condition that affect in PIMD and confirmed change value of PIMD by change of condition. Implemented non-reciprocal element shows more than 20dB isolation characteristic at center frequency(2,650MHz) and has 0.2dB insertion loss in overall 100MHz operating bandwidth. Return losses of input and output port are measured below -20dB. IMD of non-reciprocal element exhibited superior value when there were no gaps between internal components and when materials having identical substances were used, and it showed an improving tendency when the pressure was increased higher, however, in case of applying pressure higher than a certain level, it results in damages, etc. of the magnet inside and ferrite as well, so then the characteristics of IMD was rapidly increased along with decrease of frequency characteristics.

• Molecular Medicine Reports
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• v.20 no.3
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• pp.2339-2346
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• 2019

Reactive oxygen species (ROS) are important cellular second messengers involved in various aspects of cell signaling. ROS are elevated in multiple types of cancer cells, and this elevation is known to be involved in pathological processes of cancer. Although high levels of ROS exert cytotoxic effects on cancer cells, low levels of ROS stimulate cell proliferation and survival by inducing several pro-survival signaling pathways. In addition, ROS have been shown to induce epithelial-mesenchymal transition (EMT), which is essential for the initiation of metastasis. However, the precise mechanism of ROS-induced EMT remains to be elucidated. In the present study, it was indicated that ROS induce EMT by activating Snail expression, which then represses E- cadherin expression in MCF-7 cells. It was further indicated that distal-less homeobox-2 (Dlx-2), one of the human Dlx gene family proteins involved in embryonic development, acts as an upstream regulator of ROS-induced Snail expression. It was also revealed that ROS treatment induces the glycolytic switch, a phenomenon whereby cancer cells primarily rely on glycolysis instead of mitochondrial oxidative phosphorylation for ATP production, even in the presence of oxygen. In addition, ROS inhibited oxidative phosphorylation and caused cytochrome c oxidase inhibition via the Dlx-2/Snail cascade. These results suggest that ROS induce EMT, the glycolytic switch and mitochondrial repression by activating the Dlx-2/Snail axis, thereby playing crucial roles in MCF-7 cancer cell progression.

• Journal of the Korean Magnetics Society
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• v.14 no.1
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• pp.46-50
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• 2004

Compounds of $Y_{3-x}Ce_{x}Fe{5}O_{12}$(x=0.0, 0.1, 0.2, and 0.3) were prepared using the sol-gel method. The XRD measurements show that these samples have only a single phase of the garnet structure regardless of the amount of Ce substitution. The lattice constants of x = 0.0 and x = 0.3 were found to be a$_0$ = 12.3758 ${\pm}$0.0005 ${\AA}$ and 12.4062 ${\pm}$0.0005 ${\AA}$, respectively. The lattice constant increases linearly with increasing Ce concentration. The saturation magnetization was not changed flirty, with increasing Ce concentration, but coercivity decreased form 18.3 Oe to 5.8 Oe as x increased form x = 0.0 to x = 0.1. Mossbauer spectra of $Y_{3-x}Ce_{x}Fe{5}O_{12}$ were measured at various absorber temperatures from 13 K to Neel temperature. The Mossbauer spectra were fitted by least-squares technique with two subpatterns of Fe sites in the structure and corresponding to the 16a and 24d site. The temperature dependence of the magnetic hyperfine field in $^{57}$/Fe nuclei at the tetrahedral 240 and octahedral 16a sites were analyzed based on the Neel theory of ferrirnagnetism. The result of the Debye temperatures indicated that the inter-atomic binding force for the 24d site was larger than that for the 16a site.