[류호진 노무사의 질의응답❶ 주 52시간 기준 변경] 그럼 연장근로 수당도 바뀌었나요

류호진,김다린 더스쿠프 2024 더스쿠프 Vol.- No.589

PCA를 이용한 신호기반 고장진단 알고리즘

류호진,이형철 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11

본 논문에서는 소형 항공기를 이용하여 항공기 엔진의 고장을 예측하고 진단하여 정비의 효율성을 높이기 위한 고장진단 알고리즘을 제안하였다. 항공기에서 수집된 진동신호를 FFT로 주파수 신호로 변환한 뒤 ANPSD를 이용하여 신호의 첨두점(peak)의 변화를 관찰하고 PCA를 이용하여 연산의 효율성을 높였다. 특히 ANPSD의 RPM에 대한 민감도를 줄이기 위해서 PCA를 사용하였다. 본 논문에서는 실험을 통하여 알고리즘을 검증하였다. In this paper, we predict a failure of an aircraft engine using a small aircraft, and the fault diagnosis algorithm is proposed for improving the efficiency of maintenance. The vibration signals collected by the aircraft are converted into the frequency signal using the FFT(Fast Fourier Transform). After that The Averaged Normalized Power Spectral Density(ANPSD) analyze change of peak of signal and The Principal Component Analysis(PCA) increase the efficiency of calculation. Especially PCA is used to reduce the sensitivity of RPM. In this paper, an algorithm is verified by experiments.

Brassinosteroids in Plant Developmental Signaling Networks

류호진,황일두 한국식물학회 2013 Journal of Plant Biology Vol.56 No.5

Brassinosteroids (BRs) are plant steroid hormoneswith essential roles in a broad range of biological anddevelopmental processes. The molecular components ofcanonical BR signaling pathways, including the plasmamembrane-anchored co-receptor complex (BRI1 and BAK1),cytoplasmic and nuclear signal transmitters (BSK1, CDG1,BSU1, 14-3-3 proteins, BIN2, and PP2A), and key transcriptionfactors (BZR1, BES1, and BEHs) have been well established,and recent studies have revealed the prominent roles ofcrosstalk between BR pathways and other signaling pathwaysin diverse plant developmental processes. We provide anoverview of recent progress in our understanding of thebiological roles of the interplay between BRs and othersignaling cues, with an emphasis on how BRs regulate plantdevelopmental programs by modulating diverse signalingpathways.

제 1 발표장 : 강화재 형상 및 정렬 방향이금속 복합재료의 응력 전달 효율에 미치는 영향

류호진,정경현,홍순형 한국복합재료학회 1998 한국복합재료학회 학술발표대회 논문집 Vol.- No.1

Biological control of Colletotrichum panacicola on Panax ginseng by Bacillus subtilis HK-CSM-1

류호진,Hoon Park,서동상,정건호,박경석,이병대 고려인삼학회 2014 Journal of Ginseng Research Vol.38 No.3

Background: Biological control of plant pathogens using benign or beneficial microorganisms as antagonisticagents is currently considered to be an important component of integrated pest management inagricultural crops. In this study, we evaluated the potential of Bacillus subtilis strain HK-CSM-1 as abiological control agent against Colletotrichum panacicola. Methods: The potential of B. subtilis HK-CSM-1 as a biological control agent for ginseng anthracnose wasassessed. C. panacicola was inoculated to ginseng plants and the incidence and severity of disease wasassessed to examine the efficacy of the bacterium as a biological control against C. panacicola. Results: Inoculation of Panax ginseng plants with B. subtilis significantly suppressed the number of diseaselesions of C. panacicola and was as effective as the chemical fungicide iminoctadine tris(albesilate). The antifungal activity of B. subtilis against C. panacicola was observed on a co-culture medium. Interestingly,treatment with B. subtilis did not significantly affect the diameter of the lesions, suggesting thatthe mechanism of protection was through the reduction in the incidence of infection related to the initialevents of the infection cycle, including penetration and infection via spore germination and appressoriumformation rather than by the inhibition of invasive growth after infection. Conclusion: Our results suggest that B. subtilis HK-CSM-1 can be used as an effective and ecologicallyfriendly biological control agent for anthracnose in P. ginseng.

Optimization of $Nd^{3+}$ ion co-doping in $CaAl_2O_4:\;Eu^{2+}$ blue phosphor

류호진,Bartwal, Kunwar Singh,Ryu, Ho-Jin 한국자원리싸이클링학회 2007 資源 리싸이클링 Vol.16 No.5

[ $Eu^{2+},\;Nd^{3+}$ ]로 도핑된 $CaAl_2O_4$ 청색 형광체를 고상반응법으로 제조하였다. 1 mol% $Eu^{2+}$로 doping된 형광체에 다양한 조성의 $Nd^{3+}$를 co-doping함에 따라 고휘도, 장잔광 특성을 보였다. 제조한 형광체에 대하여 XRD, SEM, TEM, 빛발광 특성을 조사하였다. $CaAl_2O_4:Eu^{2+}:Nd^{3+}$의 넓은 밴드의 UV로 여기된 빛발광 특성이 $Eu^{2+}$의 $4f^65d^1$에서 $4f^7$ 상태로 천이에 의해 기인된 청색영역(${\lambda}_{max}=440\;nm$)에서 관찰되었다. $Nd^{3+}$로 co-doping한 형광체는 여기광을 차단하였을 때 장잔광 발광 특성을 나타내었다. Blue phosphor calcium aluminate, $CaAl_2O_4:Eu^{2+}$ co-doped with $Nd^{3+}$ was prepared by solid state synthesis method. Phosphor materials with 1 mol% $Eu^{2+}$ and varying compositions of $Nd^{3+}$ show high brightness and long persistent luminescence. The synthesized phosphor materials were investigated by powder x-ray diffraction (XRD), SEM, TEM, photoluminescence excitation and emission studies. Broad band UV excited luminescence of the $CaAl_2O_4:Eu^{2+}:Nd^{3+}$ was observed in the blue region (${\lambda}_{max}=440\;nm$) due to transitions from the $4f^65d^1$ to the $4f^7$ configuration of the $Eu^{2+}$ ion. $Nd^{3+}$ ion doping in the phosphor results in long afterglow phosphorescence when the excitation light is cut off.

PERFORMANCE EVALUATION OF U-Mo/Al DISPERSION FUEL BY CONSIDERING A FUEL-MATRIX INTERACTION

류호진,YEON SOO KIM,JONG MAN PARK,HEE TAEK CHAE,CHANG KYU KIM 한국원자력학회 2008 Nuclear Engineering and Technology Vol.40 No.5

Because the interaction layers that form between U-Mo particles and the Al matrix degrade the thermal properties of U-Mo/Al dispersion fuel, an investigation was undertaken of the undesirable feedback effect between an interaction layer growth and a centerline temperature increase for dispersion fuel. The radial temperature distribution due to interaction layer growth during irradiation was calculated iteratively in relation to changes in the volume fractions, the thermal conductivities of the constituents, and the oxide thickness with the burnup. The interaction layer growth, which is estimated on the basis of the temperature calculations, showed a reasonable agreement with the post-irradiation examination results of the U-Mo/Al dispersion fuel rods irradiated at the HANARO reactor. The U-Mo particle size was found to be a dominant factor that determined the fuel temperature during irradiation. Dispersion fuel with larger U-Mo particles revealed lower levels of both the interaction layer formation and the fuel temperature increase. The results confirm that the use of large U-Mo particles appears to be an effective way of mitigating the thermal degradation of U-Mo/Al dispersion fuel.

Post-irradiation Analyses of U-Mo Dispersion Fuel Rods of KOMO Tests at HANARO

류호진,J. M. PARK,Y. J. Jeong,K. H. Lee,Y. S. Lee,C. K. Kim,Y. S. Kim 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.7

Since 2001, a series of five irradiation test campaigns for atomized U-Mo dispersion fuel rods, KOMO-1, -2, -3, -4, and -5,has been conducted at HANARO (Korea) in order to develop high performance low enriched uranium dispersion fuel forresearch reactors. The KOMO irradiation tests provided valuable information on the irradiation behavior of U-Mo fuel thatresults from the distinct fuel design and irradiation conditions of the rod fuel for HANARO. Full size U-Mo dispersion fuelrods of 4-5 g-U/cm3 were irradiated at a maximum linear power of approximately 105 kW/m up to 85% of the initial U-235depletion burnup without breakaway swelling or fuel cladding failure. Electron probe microanalyses of the irradiated samplesshowed localized distribution of the silicon that was added in the matrix during fuel fabrication and confirmed its beneficialeffect on interaction layer growth during irradiation. The modifications of U-Mo fuel particles by the addition of a ternaryalloying element (Ti or Zr), additional protective coatings (silicide or nitride), and the use of larger fuel particles resulted insignificantly reduced interaction layers between fuel particles and Al.

Plant hormones in salt stress tolerance

류호진,조용구 한국식물학회 2015 Journal of Plant Biology Vol.58 No.3

Plants, as a sessile organism, rely on the endogenous regulators for the modulation of growth and development under severe stress conditions for their survival. Plant hormones have long been considered as essential endogenous molecules involved in regulating plant development and tolerance or susceptibility of diverse stresses including salinity stress. Plants are frequently exposed to numerous adverse environmental factors such as drought, cold, heat and high salinity. Under high salinity, plants rapidly reduce the growth and developmental programs in response to the stress due to either the effects of specific ions on metabolism, or adverse water relations. Recent investigations on the functional roles of plant hormones in response to unfavorable environmental conditions have eventually unravel their potentials in coffering tolerance to such conditions including salinity stress. In this review, we will present recent progress of our understanding to the important role of plant hormones including abscisic acid (ABA), auxin, cytokinins (CK), brassinosteroids (BRs), jasmonate, gibberellin (GA) and ethylene for alleviation of salt stress in plants.

착체중합법에 의한 저전압용 $Y_2$$O_3$: $Eu^{3+}$ 형광체 제조

류호진,박정규,박희동 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.8

$Eu^{3+}$ -doped $Y_2$$O_3$ phosphors has been prepared by a polymerized complex method and investigated their powder and luminescence properties. They were compared with phosphors prepared by a solid state reac-thion method. The phosphors synthesized have been characterized by X-ray diffraction low-voltage lu-minescent emission spectroscopy etc. Under low-voltage electron excitation $Eu^{3+}$-doped $Y_2$$O_3$ exhibited a strong narrow-band red emission peaking at 612nm. On the other hand the critical value for concentration quenching of sample prepared by the polymerized complex method fired at $1400^{\circ}C$ is x=0.05 for $(Y_{1-x}Eu_x__2O_3$ The emission intensity of phosphors prepared by the polymerized complex method was higher than that of phosphors prepared by the solid state reaction method.