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Identification of Genes Related to Fungicide Resistance in Fusarium fujikuroi
( Younghae Choi ),( Boknam Jung ),( Taiying Li ),( Jungkwan Lee ) 한국균학회 2017 Mycobiology Vol.45 No.2
We identified two genes related to fungicide resistance in Fusarium fujikuroi through random mutagenesis. Targeted gene deletions showed that survival factor 1 deletion resulted in higher sensitivity to fungicides, while deletion of the gene encoding F-box/WD-repeat protein increased resistance, suggesting that the genes affect fungicide resistance in different ways.
Oscillatory Interlayer Exchange Coupling in Amorphous CoSiB/Pt/CoSiB Structure
Choi, Youngha,Lee, Kyujoon,Kim, Youngkwang,Kang, Seung Ku,Kim, Taewan,You, Chun-Yeol,Jung, Myung-Hwa IEEE 2015 IEEE transactions on magnetics Vol.51 No.11
<P>Oscillatory interlayer exchange coupling (IEC) is found in amorphous CoSiB(1.5 nm)/Pt( <TEX>$t_{\rm {Pt}})$</TEX>/CoSiB(1.5 nm) structure as a function of the Pt layer thickness, <TEX>$t_{\rm {Pt}}$</TEX>, which is varied from 1.4 to 3.0 nm. We prepared the samples using dc magnetron sputtering method, and measured anomalous Hall resistance and magnetization hysteresis loops. All the samples show out-of-plane easy axes with perpendicular magnetic anisotropy energies. Surprisingly, strong antiferromagnetic IEC is found when <TEX>$t_{\rm {Pt}}=2.2-2.7$</TEX> nm, otherwise they are simple ferromagnets like multilayer systems of Co/Pt and Fe/Pt. The Pt layer is known as near ferromagnet, because it is easily polarized with an adjacent ferromagnetic layer or by a small amount of ferromagnetic impurities. The interlayer coupling via Pt has always been observed to be ferromagnetic so far. We report the antiferromagnetic IEC in amorphous CoSiB/Pt/CoSiB trilayer structure and propose its possible physical origin based on quantum well theory and negative spin polarization of Pt layer.</P>
Choi, KwangHyun,Sohn, YoungHa,Moon, GeumJu,Kim, YongSang,Jeon, Jae-Hong,Park, KeeChan The Korean Infomation Display Society 2018 Journal of information display Vol.19 No.1
The low-temperature polycrystalline silicon (LTPS) thin-film transistor (TFT) is the optimal device for the backplane of the organic light-emitting diode display. At the end the p-channel LTPS TFT fabrication, a charge-injection stress with a strong negative drain bias and a positive gate bias are applied to reduce the off-current by injecting electrons into the gate insulator near the drain. In this study, the charge density and the length of the charge-injection region in the gate insulator were estimated by comparing the measured TFT characteristics with the simulation models with various charge-injection lengths and charge densities. It was found that the effective length of the charge-injection region was $0.96{\mu}m$ and the charge density was $-3{\times}10^{12}/cm^2$ for the $2-{\mu}m$-channel-length device when $V_{GS}$ was +20 V and $V_{DS}$ was -10 V under the charge-injection stress condition. It was also found, based on the analysis of the electric field distribution under the bias stress condition, that the charge density and the length of the charge-injection region were invariant against the channel length variation. Therefore, the measured TFT characteristics also accorded closely with the simulation models for different channel lengths, such as 4 and $10{\mu}m$, when the same characteristic values of the charge-injection region were employed.
Choi Youngha,Jung Se Yong,Park Jung Min,Suh Junghwan,Shin Eun Jung,Chae Hyun Wook,Kim Ho-Seong,Kwon Ahreum 대한소아내분비학회 2023 Annals of Pediatirc Endocrinology & Metabolism Vol.28 No.2
Thyroid hormone plays a vital role in regulating human metabolism. They affect the functions of major organs, such as the brain, liver, skeletal muscle, and heart. Hypothyroidism can lead to dilated cardiomyopathy and decreased heart function. In this report, we describe a case of a teenage boy who developed dilated cardiomyopathy due to hypothyroidism and was considered to undergo heart transplantation. Levothyroxine monotherapy was initiated but produced no improvement. Thereafter, a combination therapy of liothyronine and levothyroxine was administered, and heart function was gradually restored; he recovered completely after 6 months. Cardiac myocytes respond more specifically to liothyronine than to levothyroxine. Therefore, we suggest that liothyronine and levothyroxine combination therapy should be considered rather than levothyroxine monotherapy for hypothyroidism accompanied by heart disease.
항공사 객실승무원의 심리적 주인의식이 직무열의와 조직시민행동에 미치는 영향
최지나(Choi, Jina),김영하(Kim, Youngha),박윤주(Park, Yunjoo) 한국서비스경영학회 2018 서비스경영학회지 Vol.19 No.2
This study is about psychological ownership of cabin crew which is to verify the effects on job engagement and organization citizenship behavior. The data were collected from the valid questionnaires completed by 205 cabin crew members of Korean air. The results show that the cabin crew’s psychological ownership of the organization has positive effects on devotion and dedication of job engagement. The cabin crew’s psychological ownership of the job has positive effects on dedication, vigor and absorption of job engagement. The cabin crew’s vigor and absorption of job engagement have a positive effect on organizational citizenship behavior. This paper conveys the importance of psychological ownership for cabin crew to lead the job engagement and organizational citizenship behavior for the company and it provides academic and practical implications.
카뷰레터 니들 밸브를 이용한 26cc 소형원동기의 희박 연소 특성
최영하(Youngha Choi),김병국(Byeong-guk Kim),오진우(JinWoo Lee),윤석주(Suckju Yoon),김동선(Dongsun Kim),한종규(Jongkyu Han) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents the effects of access air factors and throttle open degrees on the performance of a small spark-ignition gasoline engine. The engine used in this paper was a single cylinder, diaphragm carburetor, two-stroke, air-cooled 26cc engine for brush cutter. The rpm, torque, fuel consumption and HC, CO, NOx emission were measured under lean burn conditions on the opened area ratios and engine loads respectively. The results showed that the maximum power and minimum fuel consumption could be obtained. leaner mixture tuning decreases HC and CO emission.
카뷰레터 전후단 압력차에 의한 소형원동기의 혼합기 유동 특성
최영하(Youngha Choi),김병국(Byeong-guk Kim),오진우(JinWoo Oh),이동근(Dongkeun Lee),윤석주(Suckju Yoon),김동선(Dongsun Kim),한종규(Jongkyu Han) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
This paper presents the pressure of carburetor air inlet and outlet and performance of a small spark-ignited gasoline engine. The engine used in this paper is a single cylinder, two-stroke, air-cooled 23cc SI engine for brush cutter. We measured the RPM, torque, fuel consumption and air inlet pressure at carburetor front and back according to the throttle open ratio. The results showed that the pressure wave and difference of the carburetor front and back pressures was increased at increasing throttle area ratio, power and fuel flow-rate were increased at increasing difference of front and back pressures.
최영하(Youngha Choi),조성남(Sungnam Cho),김병국(Byeongguk Kim),조형문(Hyungmun Cho),윤석주(Suckju Yoon),한종규(Jongkyu Han) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents the effects of equivalence ratios and throttle open degrees on the emission and performance of a small spark-ignition gasoline engine. The engine used in this paper was a single cylinder, diaphragm carburetor, two-stroke, air-cooled 26㏄ engine for brush cutter. The rpm, torque, fuel consumption and CO emission were measured under the four different equivalence ratio and three different throttle degree conditions on the engine loads respectively. In addition, the difference of the rpm on the dynamometer and the engine was confirmed to verify the effect of clutch by using for transfer the engine power. The results showed that the maximum power and minimum fuel consumption could be obtained at λ=0.9 and 9% load of dynamometer, and also the leaner mixture tuning develops the lower CO emission.