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Shin Joseph,Han Suhyeon,Lee Sejin,Kwon Youngsung 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.2
Frequency control is one of the challenges in wind turbine generation. One frequency control method used by wind turbine generators (WTGs) is droop control. In the droop control method, various strategies have been devised to continually update the droop gain to suit the current situation. This study proposes a modifed droop control method that uses the advantages of two variable droop control strategies based on the system frequency deviation: the rate of change of frequency (ROCOF)- based method and the frequency-dependent method. Moreover, limits were set in the droop gain value based on the rotor speed. The proposed ROCOF-based frequency-dependent droop control strategy aims at maximizing the frequency nadir improvement with a quick primary frequency response reaction time while preventing secondary frequency drop or stall of the turbines. These improvements can be used to increase wind penetration in the system, allowing for the reduction of fossil fuel use. The frequency regulation performance of the proposed droop control strategy was compared with other droop control methods in the MATLAB/Simulink environment using a doubly fed induction generator (DFIG) WTG model based on the National Renewable Energy Laboratory Fatigue, Aerodynamics, Structures, and Turbulence model.
Shin, Beom Soo,Choi, Jin Won,Balthasar, Joseph P.,Hong, Deok Ki,Kim, Jung Jun,Yoo, Sun Dong John Wiley Sons, Ltd. 2007 Rapid communications in mass spectrometry Vol.21 No.3
<P>A rapid and sensitive liquid chromatography/mass spectrometry (LC/MS) method was developed and validated for the determination of roxatidine in human plasma. Roxatidine was extracted by single liquid-liquid extraction with tert-butyl methyl ether, and the chromatographic separation was performed on a C<SUB>8</SUB> column. The total analytical run time was relatively short (5 min), and the limit of assay quantification was 2 ng/mL using 0.1 mL of human plasma. Roxatidine and the internal standard, propranolol, were monitored in selected ion monitoring (SIM) mode at m/z 307.3 and 260.3, respectively. The standard curve was linear over a concentration range from 2–500 ng/mL, and the correlation coefficients were >0.999. The mean intra- and inter-day assay accuracy ranged from 103.4–108.8% and 102.3–110.0%, respectively, and the mean intra- and inter-day precision was between 3.3–8.8% and 5.3–6.2%, respectively. The developed assay method was successfully applied to a pharmacokinetic study in human volunteers after oral administration of roxatidine acetate hydrochloride at a dose of 75 mg. Copyright © 2007 John Wiley & Sons, Ltd.</P>
Shin, Dong Yun,Cho, Hyun Uk,Utomo, Joseph Christian,Choi, Yun-Nam,Xu, Xu,Park, Jong Moon Elsevier 2015 Bioresource technology Vol.184 No.-
<P><B>Abstract</B></P> <P>Microalgae, <I>Scenedesmus bijuga</I>, was cultivated in anaerobically digested food wastewater effluent (FWE) to treat the wastewater and produce biodiesel simultaneously. Three different mixing ratios with municipal wastewater were compared for finding out proper dilution ratio in biodiesel production. Of these, 1/20 diluted FWE showed the highest biomass production (1.49g/L). Lipid content was highest in 1/10 diluted FWE (35.06%), and the lipid productivity showed maximum value in 1/20 diluted FWE (15.59mg/L/d). Nutrient removal was also measured in the cultivation. FAME compositions were mainly composed of C16–C18 (Over 98.94%) in <I>S. bijuga</I>. In addition, quality of FAMEs was evaluated by Cetane Number (CN) and Bis-allylic Position Equivalent (BAPE).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Anaerobically digested food wastewater effluent was used for algal cultivation. </LI> <LI> Biodiesel was produced by <I>Scenedesmus bijuga</I>. </LI> <LI> Different dilution ratios were compared with lipid productivity. </LI> <LI> Nutrient removal was analyzed in cultivation. </LI> <LI> Quality of FAMEs was evaluated by two indicators. </LI> </UL> </P>
Shin, Beom Soo,Yoon, Chi Ho,Balthasar, Joseph P.,Choi, Bu Young,Hong, Seok Hyun,Kim, Hyoung Jun,Lee, Jong Bong,Hwang, Sang Wook,Yoo, Sun Dong John Wiley Sons, Ltd. 2009 Biomedical chromatography Vol.23 No.7
<P>This study reports a rapid screening method for the prediction of oral drug bioavailability in humans based on combined immobilized artificial membrane (IAM) chromatographic capacity factor (k<SUB>IAM</SUB>) and in vitro stability in hepatic microsomes. The fraction of drug absorbed (F<SUB>a</SUB>) in humans was predicted for a set of 15 structurally diverse commercial drugs based on k<SUB>IAM</SUB> values using a mobile phase consisting of acetonitrile: Dulbecco's phosphate-buffered saline. The hepatic intrinsic clearance (CL<EM><SUB>int</SUB><SUP>′</SUP></EM>) was calculated from in vitro disappearance half-life, and the oral bioavailability was predicted using in vitro hepatic clearance (CL<SUB>h</SUB>) and F<SUB>a</SUB>. Significant correlations were observed for the relationships between predicted hepatic extraction ratios (ER<SUB>h</SUB>) and actual presystemic metabolism (r = 0.854) and between predicted and observed oral bioavailabilities (r = 0.805; p < 0.01). The IAM capacity factor together with the hepatic microsomal disappearance half-life may be useful in identifying compounds with high oral absorption potential in early drug discovery processes. Copyright © 2009 John Wiley & Sons, Ltd.</P>
신현재,Rose, Joseph L.,송성진 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.1
본 연구에서는 유도초음파를 이용하여 열 교환기와 증기발생기 튜브의 결함을 비파괴적으로 탐상하고 그 크기를 산정하였다. 이론적인 해석을 위해 인코넬(Inconel) 튜브에 대한 위상 및 군속도 분산선도를 Longitudinal 모드와 Flexural 모드에 대해 구하였다. 튜브의 원주방향 레이저노치와 튜브 지지대 하단의 방전가공결함(EDM wear)을 각각 비대칭 및 대칭 탐촉자 세트를 사용하여 탐상하였다. 실험결과 방전가공결함은 L(0, 2), L(0, 3), L(0, 4) 모드로 탐상되었으며, 그 중 L(0, 4) 모드가 결함으로부터 가장 잘 반사되었다. 레이저노치의 경우에는 L(0, 1) 모드 주변의 Flexural 모드가 결함을 탐상하고 크기를 산정하는데 사용될 수 있음을 보였다. This study shows the defect detection and sizing capability of ultrasonic guided waves in the nondestructive inspection of heat exchanger and steam generator tubing. Phase and group velocity dispersion curves for the longitudinal and flexural modes of a sample Inconel tube were presented for the theoretical analysis. EDM(Electric Discharge Machining wears in tubing under a tube support plate and circumferential laser notches in tubing were detected by an axisymmetric and a non-axisymmetric transducer set up, respectively. EDM wears were detected with L (0, 2), L(0, 3) and L(0, 4) modes and among them L(0, 4) mode was found to be the most sensitive. It was also found that the flexural modes around L(0, 1) mode could be sued for the detection and sizing of laser notches in the tubing.
Shin, Eunsam,Hopfinger, Joseph B.,Lust, Sarah A.,Henry, Erika A.,Bartholow, Bruce D. American Psychological Association 2010 Psychology of addictive behaviors Vol.24 No.3
<P>Low sensitivity to the acute effects of alcohol is a known risk factor for alcoholism. However, little is known concerning potential information-processing routes by which this risk factor might contribute to increased drinking. We tested the hypothesis that low-sensitivity (LS) participants would show biased attention to alcohol cues, compared with their high-sensitivity (HS) counterparts. Participants performed a task in which alcoholic and nonalcoholic beverage cues were presented bilaterally followed by a target that required categorization by color. Response times were faster for targets appearing in alcohol-cued than non-alcohol-cued locations for LS but not for HS participants. Event-related potential markers of early attention orienting (P1 amplitude) and subsequent attention reorienting (ipsilateral invalid negativity amplitude) indicated preferential selective attention to alcohol-cued locations among LS individuals. Controlling for recent drinking and family history of alcoholism did not affect these patterns, except that among HS participants, relatively heavy recent drinking was associated with difficulty reorienting attention away from alcohol-cued locations. These findings suggest a potential information-processing bias through which low sensitivity could lead to heavy alcohol involvement.</P>
제조 솔루션 생성을 위한 Plug and Play 플랫폼 구현에 관한 연구
오요셉(Joseph Oh),서호연(Hoyeon Seo),신동민(Dongmin Shin) 대한산업공학회 2009 대한산업공학회 춘계학술대회논문집 Vol.2009 No.5
최근 다수의 제조 기업이 업무 효율을 향상시키기 위해 제조 솔루션을 도입하고 있는 추세이다. 그러나 각각의 제조 기업에 해당하는 특징이 다르기 때문에 제조 솔루션이 제 역할을 하지 못하는 경우가 있다. 본 논문에서는 이를 해결하기 위하여 맞춤형 제조 솔루션 생성 시스템인 Plug and Play 플랫폼과 이를 구현하기 위한 세부기술을 제안한다. Plug and Play 플랫폼은 서비스 컴포지션과 웹 플랫폼의 특성을 융합한 시스템이며 이를 구현하기 위한 핵심 세부기술에는 제조 솔루션 모듈 조합, Plug and Play 플랫폼 기술언어, 플랫폼 데이터베이스가 있다. 이를 통하여 제조 솔루션 판매 기업은 포화되어있는 시장 상황을 벗어날 수 있고, 사용 기업은 맞춤형 제조 솔루션 도입이 가능해지는 효과를 얻을 수 있다.
LEE, SHIN HO,FRANK, JOSEPH F. 한국미생물 · 생명공학회 1992 Journal of microbiology and biotechnology Vol.2 No.2
The effect of a nisin-produdng Lactococcus lactis spp. lactis (L. lactic) on the growth and attachment of Listeria monocytogenes Scott A and Brie 1 on stainless steel and their growth in Brain Heart Infusion broth was determined. Viable cells of Listeria decreased rapidly after 9∼12 hr of incubation at 21℃ and after 6∼9 hr of incubation at 32℃ in the presence of L. lactic. The number of L. monocytogenes Scott A attached to stainless steel in pure culture was 2.5×10 exp (3)/㎠ at 21℃ and 2.3×10 exp (3)/㎠ at 32℃ after 48 hr of incubation, but was only 10/㎠ at 21℃ and 1.1×10/㎠ at 32℃ in the presence of L. lactis. Results from L monocytogenes strain Brie 1 were similar to those from strain Scott A. The population of L. monocytogenes Scott A which attached to stainless steel with previously adherent L. lactis was 1.8×10 exp (2)/㎠ at 21℃ and 8.2×10 exp (2)/㎠ at 32℃, whereas the population attached to sterile stainless steel was 12×10 exp (3)/㎠ at 21℃ and 2.1×10 exp (2)/㎠ at 32℃. For L. monocytogenes Brie 1, the attached population of the control was 1.6×10 exp (4)/㎠ at 21℃ and 3.2×10 exp (2)/㎠ at 32℃, and on stainless steel with adherent L. lactis, it was 1.1×10 /㎠ at 21℃ and 6.9×10/㎠ at 32℃. Surface adherent L. lactis was less inhibitory to attachment of L. monocytogenes on stainless steel than a liquid culture inoculum. Listeria attached to stainless steel survived dry storage for 20 days both in the presence and absence of adherent lactococd.