• Bulletin of the Korean Chemical Society
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• v.25 no.5
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• pp.711-714
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• 2004

Peroxynitrite enters erythrocytes through band 3 anion exchanger and oxidizes cytosolic proteins therein. As a protein associated with band 3, carbonic anhydrase II may suffer from peroxynitrite-induced oxidative damages. Esterase activity of carbonic anhydrase II decreased as the concentration of peroxynitrite increased. Neither hydrogen peroxide nor hypochlorite affected the enzyme activity. Inactivation of the enzyme was in parallel with the release of zinc ion, which is a component of the enzyme's active site. SDS-PAGE of peroxynitrite-treated samples showed no indication of fragmentation but non-denaturing PAGE exhibited new bands with lower positive charges. Western analysis demonstrated that nitration of tyrosine residues increased with the peroxynitrite concentration but the sites of nitration could not be determined. Instead MALDI-TOF analysis identified tryptophan-245 as a site of nitration. Such modification of tryptophan residues is responsible for the decrease in tryptophan fluorescence. These results demonstrate that peroxynitrite nitrates tyrosine and tryptophan residues of carbonic anhydrase II without causing fragmentation or dimerization. The peroxynitrite-induced inactivation of the enzyme is primarily due to the release of zinc ion in the enzyme's active site.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2001.11a
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• pp.337-340
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• 2001

We show that the microstrip ring with a narrow gap exhibits a photonic band gap (PBG) that is generally believed to be created by a periodic array. The discontinuity of impedance at the narrow gap induces the multiple reflections with fixed phase correlation necessary to make the PBG. We have also discussed the tuning of the PBG frequency by applying an external voltage on a varactor mounted on the gap and the applications of this PBG ring as a tunable bandstop filter and a microwave switch.

• Proceeding of EDISON Challenge
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• 2017.03a
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• pp.441-447
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• 2017

본 논문에서는 다양한 원소 조합을 통한 다양한 특성과 2D 구조의 형성이 가능한 물질로서 최근 많은 응용에 활용되고 있는 TMD물질에 대하여 strain 엔지니어링 방법을 탐색하고자 하였다. 에디슨 나노물리의 LCAO 기반 DFT 전자구조계산 SW를 이용해 4, 5, 6족의 TMD물질($MX_2$, M = Zr, Nb, Mo; X = S, Se, Te)의 monolayer, bulk 상태에 strain을 가했을 때 전자 구조의 변화를 계산하였다. Band gap 크기, 전자의 effective mass의 변화, direct-indirect gap transition 등을 전이금속의 종류에 따라 분류하여 분석할 수 있었다.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.345-346
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• 2006

In this paper, we propose the noise suppressor with the psychoacoustic model and wavelet packet transform. The objective of the scheme is to enhance speech corrupted by colored or non-stationary noise. If corrupted noise is colored, subband approach would be more efficient than whole band one. To avoid serious residual noise and speech distortion, we must adjust the Wavelet Coefficient threshold. In this paper, the subband is designed matching with the critical band. And WCT is adapted by noise masking threshold(NMT) and segmental signal to noise ratio(seg_SNR). Consequently this work improve the PESQ-MOS about 0.23 in the case of coded speech.

• Proceedings of the IEEK Conference
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• 2007.07a
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• pp.187-188
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• 2007

A stripline fed slot antenna for UWB communication is designed by using Ensemble simulator. The antenna has a broadband characteristics which causes a fork-like tuning stub. The ground of this antenna has two conductor lines for WLAN band(5GHz band) rejection.

• The Bulletin of The Korean Astronomical Society
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• v.36 no.1
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• pp.44-44
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• 2011

상대적으로 온도가 낮은 태양계 천체의 적외선 분광관측 자료는 행성대기의 구성성분, 온도 분포와 haze및 구름을 포함한 대기의 수직구조에 대한 연구를 수행하는 기본이 된다. 외국 망원경의 관측자료에 의존했던 거대 행성 및 타이탄의 적외선 분광자료를 IGRINS를 통해 자체적으로 획득한 자료는 행성대기 연구를 주도적으로 진행할 수 있다는 점에서 큰 의미가 있다. 특히 목성, 토성, 타이탄 대기의K-band(2.0-2.45mm), H-band(1.45-1.80mm) 고분산 분광자료는 기존의 저분산 분광 관측 결과 또는 다른 파장대의 관측 결과와의 비교도 의미가 있을 것으로 기대한다. 그리고 IGRINS의 고 분해능을 이용하면 지구대기에 의해 지상관측이 쉽지 않은 $2.4-2.45{\mu}m$ 파장대에서 지구 흡수선 사이로 도플러 이동되어 들어오는 행성의 분광 자료를 얻을 수 있을 것으로 예상된다. 이에 따라 우리는 IGRINS를 이용한 태양계 행성관측의 시나리오를 마련하고자 한다.

• Journal of the Korea Institute of Military Science and Technology
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• v.10 no.3
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• pp.154-160
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• 2007

A direction finding system test-bed(DFSTB) at the electronic warfare communication-band is presented to efficiently evaluate and optimize the performance of the direction finding system through the indoor test setup. This test-bed gives a significant benefit to the designers of the direction finding system because it allows flexible test and design trade-off in the system design cycle. The system description and implementation of test-bed architecture, and the experiment results of direction finding accuracy according to modulation schemes are presented.

• Journal of the korean academy of Pediatric Dentistry
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• v.36 no.3
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• pp.427-432
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• 2009

The aim of this study was to compare the shear-peel strength and the fracture site of 5 commercially available orthodontic band cements. One hundred molar bands were cemented to extracted human 3rd molars. The specimens were prepared in accordance with the manufacturer's instructions for each cement. After storage in a humidor at $37^{\circ}C$ for 24 hours, the shear debonding force was assessed for each specimen using an universal testing machine with crosshead speed of 2 mm/minute. Maximal failure stress was converted to mean shear-peel strength, MPa. The predominant site of band failure was recorded visually for all specimens as either at the band/cement or cement/enamel interface. Mean shear-peel strength of Ormco was the highest(2.44${\pm}$0.57), followed by Fuji $Ortho^{TM}$(2.24${\pm}$0.50), $Ketac-Cem^{TM}$(2.10${\pm}$0.57), 3M $Unitek^{TM}$(1.82${\pm}$0.43), $Band-Lok^{TM}$(1.73${\pm}$0.28). There were statistically significant differences between Ormco and $Band-Lok^{TM}$, Ormco and 3M $Unitek^{TM}$, and Fuji $Ortho^{TM}$ and $Band-Lok^{TM}$(p<0.05). The predominant site of bonding failure for bands cemented with the Ormco was at the band/cement interface, whereas bands cemented with Ultra $Band-Lok^{TM}$ failed predominantly at the enamel/cement interface. There was no significant difference among the other cements(Fuji $Ortho^{TM}$, 3M $Unitek^{TM}$, $Ketac-Cem^{TM}$).

• Korean Journal of Agricultural Science
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• v.41 no.4
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• pp.351-359
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• 2014

For identifying the plasmid DNA coding cry gene of Bacillus thuringiensis subsp. aizawai KB098 with high insecticidal activity against Spodoptera exigua, mutant isolates with no crystal protein were produced by $42^{\circ}C$ incubation condition and then mutant plasmid DNA band patterns were compared with those of KB098. KB098 isolates had 4 cry genes, cry1Aa, cry1Ab, cry1C, cry1D, and also had been found seven plasmid DNA. Though the SDS-PAGE experiment, it was confirmed that mutant didn't produce 130~145kDa protein band involved in bipyramidal shape crystal. Also, five mutant isolates had no cry genes coding plasmid DNA in PCR. In result of comparison the plasmid DNA of KB098 and 5 mutant isolates, only 1 plasmid DNA band was left out in mutant plasmid DNA pattern, so that the missing band was extracted from the gel. The missing(disappeared) plasmid DNA was the largest molecular size among the 7 plasmid DNA of KB098 and it was also confirmed this plasmid DNA had all 4 cry genes through PCR.

• Korean Journal of Medicinal Crop Science
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• v.4 no.3
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• pp.224-230
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• 1996

Randomly amplified polymorphic DNA(RAPD) analysis was applied to detect the molecular polymorphisms in Gentiana scabra var. buergeri. A high level of molecular variability was found among wild plants and cultivars. In genetic analysis, eight of twenty primers were selected and 54 amplification products ranged 2. 2 to 0.2 kb were compared. Twenty - nine amplified products showed polymorphic, while five were monomorphic. Twenty of line specific bands were found. In genetic similarity and cluster analysis using PCR products, three wild plants collected from Naejangsan, Daedunsan and Keojedo and one cultivar Seochunjaerae were grouped into one cluster, while cultivar Jinbujaerae and Japanese line separated into another clusters, respectively. The identification of DNA polymorphisms by the RAPD technique will facilitate the selection of the lines from different origin.