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Arowana(Scleropages formosus)에서 Hemolysin Gene을 지닌 Aeromonas sobria 분리 및 특성
전진우,김지형,카시아노 허모피아,신상필,한지은,박세창 한국임상수의학회 2010 한국임상수의학회지 Vol.27 No.1
Arowana (Scleropages formosus) is the most valuable group of ornamental fishes and very much in demand in the ornamental fish trade and commands high price ranging from hundreds to thousands of dollars per fish. In this paper, we described a case of mortality of arowana from a private aquarium in Korea. A bacterial pathogen from fish organs (brain, kidney, liver) was cultured, identified and confirmed using Vitek System 2, API 20E test, multiplex PCR and 16S rRNA gene sequencing. The morphological and biochemical properties of the bacterium isolated from the brain, kidney and liver of the fish were similar to Aeromonas sobria. Positive amplification products using the multiplex PCR assay for detection of A. sobria were obtained from these organs. The 16S rRNA gene of the isolates from fish was identical and exhibited 100% sequence similarity with A. sobria (AY987762.1) strain available from GenBank. This bacterium contained hemolysin gene, a virulence factor that plays an important role in outbreaks of disease and is pathogenic to humans as well as in fish. Although this opportunistic bacterium was isolated from a fish without any external symptoms, this pathogen may act as a reservoir and enhance chances of zoonosis to human such as during handling.
펨토초 레이저와 나노초 레이저를 이용한 ITO Glass의 어블레이션 비교 연구
전진우,신영관,김훈영,최원석,지석영,강희신,안상훈,장원석,조성학 한국광학회 2017 한국광학회지 Vol.28 No.6
Indium tin oxide (ITO) provides high electrical conductivity and transparency at visible and near-IR wavelengths. ITO is widelyused as a transparent electrode for the fabrication of LCDs, OLEDs, and many kinds of optical applications. It is widely employedfor electrodes in various electric and display sectors because of its transparency in the visible range and high conductivity. Therefore, one issue is removing a specific area of a layer of material such as ITO or metallic film on a substrate, without affectingthe properties of the substrate. ITO-on-glass removal using a laser is friendlier to the environment than traditional methods. In thisstudy, ablation of ITO film on glass using a femtosecond-laser micromachining system (wavelength 1026 nm, pulse duration 150 fs)and a nanosecond-laser micromachining system (wavelength 1027 nm, pulse duration 5 ns) are described, compared, and analyzed.
협동로봇 설치작업장 위험성평가 방법 개발 및 규제 대응
전진우,류요엘,김근옥,김회춘 한국로봇학회 2019 로봇학회 논문지 Vol.14 No.4
Cobots are industrial robots with greatly enhanced safety functions that enable them to work in the same space with workers without protector. Cobots are regulated by the Industrial Safety and Health Act and must be certified according to the manufacturing stage, installation stage and usage stage. The ISO 10218-2 standard applied in the installation phase is difficult to apply in the field. Therefore, it is necessary to develop a risk assessment method based on ISO 12100 standard. This paper proposes a new methodology that combines ‘JSA’ and ‘What-if’, which reflects the human error and the lack of known risk factors. Accordingly, a new risk assessment template was proposed and the effectiveness of the developed new template was examined. The current cobot safety regulations need to be unified with safety inspections scheme, and robot safety experts and infrastructures need to be expanded and Robot safety regulations should be unified to ‘Robot Act’. Based on this research, risk assessment methods suitable for the field need to be developed additionally, and robot safety regulation needs to be transformed to promote the industry.
A DC-DC Converter with Voltage-Mode PWM Control
전진우,김철우 한국과학기술원 반도체설계교육센터 2019 IDEC Journal of Integrated Circuits and Systems Vol.5 No.3
- In this paper, a voltage-mode PWM controlled buck converter is addressed. It consists of a pair of fullyintegrated switches, an LC filter, a type 3 compensation loop, an internal ramp & clock generator, and a dead-time generator. A portion of output is taken with a resistive divider and subtracted from an external reference voltage to generate an error voltage. Then the error voltage is compared with a ramp signal, creating a PWM signal for controlling high-side and low-side switches. This buck converter is fabricated in 0.18-μm CMOS process and area of control block is 0.28 mm2. Input voltage is 3.3 V and target output voltage is 1.8 V. Peak measured power conversion efficiency is 94.38% at 150 mA constant load condition. In a load transient testing from 100 mA to 300 mA, overshoot settling time measures 17.44 us. Overshoot magnitude is 68 mV and undershoot settling time and magnitude is 8.56 us and 60.8 mV, respectively.
전진우,이동환,원용선,이민규 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.3
The photocatalytic decomposition characteristics of individual and binary vapors of benzene, toluene, and ethylbenzene by a UV reactor were studied. The reactor was custom-designed to have a synergistic effect of photochemical oxidation by ozone generated by UV254+185 nm lamps and photocatalytic oxidation by TiO2 photocatalyst whose surface area was almost doubled by helically inserted TiO2-coated perforated planes. The removal efficiencies of individual vapors of benzene, toluene, and ethylbenzene generally increased in proportion to the relative humidity and oxygen supply. The photocatalytic decomposition kinetics of individual vapors, as well as binary vapors consisting of benzene-toluene, benzene-ethylbenzene, and toluene-ethylbenzene, followed the Langmuir-Hinshelwood (L-H) equation quite well. Maximum elimination capacities of individual vapors were 560 g/m3∙day, 630 g/m3∙day, and 1,024 g/ m3∙day for benzene, toluene, and ethylbenzene, respectively. In view of mutual impact for the photocatalytic decomposition of binary vapors, the reaction rate of the target component was more influenced by the presence of the counter component with lower bond dissociation energy.
Polysulfone으로 Al(OH)<sub>3</sub>를 고정화한 PSf-Al(OH)<sub>3</sub> 비드에 의한 불소 이온의 제거 특성
전진우,이민규,Jeon, Jin-Woo,Lee, Min-Gyu 한국청정기술학회 2014 청정기술 Vol.20 No.1
In this study, PSf-$Al(OH)_3$ beads were prepared by immobilizating aluminum hydroxide $Al(OH)_3$ with polysulfone (PSf). The removal experiments of the fluoride ions by PSf-$Al(OH)_3$ beads were conducted batchwise and the parameters such as pH, initial fluoride concentration, and coexisting ions were investigated. The maximum removal capacity obtained from Langmuir isotherm was 52.4 mg/g and the optimum pH region of fluoride ions was in the range of 4 to 10. The removal process of fluoride ions by PSf-$Al(OH)_3$ beads was found to be controlled by both external mass transfer at the earlier stage followed by internal diffusion at the later stage. The presence of coexisting anions such as $HCO_3{^-}$, $SO{_4}^{2-}$, $NO_3{^-}$, and $Cl^-$ had a negative effect on removal of fluoride ions by PSf-$Al(OH)_3$ beads. 본 연구에서는 폴리술폰(polysulfone, PSf)으로 알루미늄 수산화물(aluminum hydroxide, $Al(OH)_3$)을 고정화한 PSf-$Al(OH)_3$ 비드를 제조하였다. 제조한 PSf-$Al(OH)_3$ 비드에 의한 불소 이온 제거실험은 회분식으로 수행하였으며, pH, 초기농도, 공존이온과 같은 변수들의 영향을 살펴보았다. Langmuir 등온식으로 구한 불소 이온의 최대 제거량은 52.4 mg/g이었으며, 최적 pH 범위는 4~10이었다. PSf-$Al(OH)_3$ 비드에 의한 불소 이온의 제거과정은 전 단계에서 외부물질전달이 나중 단계에서 내부확산이 지배인 것을 알 수 있었다. 또한 PSf-$Al(OH)_3$에 의한 불소 이온의 제거에서 $HCO_3{^-}$, $SO{_4}^{2-}$, $NO_3{^-}$, $Cl^-$와 같은 공존 음이온들은 불소 이온의 제거에 방해를 하는 것으로 나타났다.
전진우,김지한,이준엽,황석호 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
열활성화 지연 형광(TADF)의 재료로써 oxidation한 dibenzothiophene에 acridine을 도입한 2,8-bis(9,9-dimethylacridin-10(9H)-yl)dibenzothiophene 5,5-dioxide(DTAO)을 합성하였다. DTAO는 2.53 eV의 일중항에너지와 2.47 eV의 삼중항에너지를 보여 일중항 에너지와 삼중항 에너지의 차이가 0.06 eV였다. 또한 DTAO는 donor-acceptor 구조를 가지고 있어 열활성화 지연 형광특성을 보였으며, 14.3%의 높은 양자 효율과 함께 (0.30, 0.55)의 색 좌표를 갖는 높은 효율의 녹색 TADF 소자를 제작할 수 있었다.