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고정우,김종희,이수갑,Ko, Jeongwoo,Kim, Jonghui,Lee, Soogab 한국음향학회 2018 韓國音響學會誌 Vol.37 No.2
The noise sources of a tip-jet driven rotor can be separated by rotor blade noise and jet noise. The rotor blade noise consists of thickness noise, loading noise, nonlinear quadrupole noise, and jet noise is divided into nozzle momentum noise and jet radiation noise. The flow analysis for the prediction of rotor blade noise is performed by CFD (Computational Fluid Dynamics) analysis, and the noise source of the rotor blade noise is identified by simultaneously applying the permeable and impermeable surface based FW-H (Ffowcs Williams-Hawkings) acoustic analogy. The nozzle momentum noise is obtained by permeable surface FW-H, and jet radiation noise is predicted by using empirical method for the fixed-wing jet. Both of jet noises use nozzle exit condition for noise analysis. The accuracy of the technique is verified based on the noise measurements of the tip-jet driven rotor, and the unique noise characteristics of the tip-jet driven rotor is confirmed by spectrum analysis. 팁젯 로터의 소음원은 로터 블레이드 소음과 제트 소음으로 분리할 수 있다. 로터 블레이드 소음은 두께 소음, 하중 소음, 비선형 사중극 소음으로 구성되고 제트 소음은 노즐 모멘텀 소음과 제트 방사 소음으로 나뉜다. 로터 블레이드 소음을 해석하기 위해 유동 해석 정보를 전산유체역학(Computational Fluid Dynamics, CFD) 해석으로 얻은 뒤 투과면, 비투과면 FW-H(Ffowcs Williams-Hawkings) 음향 상사법을 동시에 적용하여 각 소음원을 구분하였다. 그리고 제트 소음은 노즐 출구 조건을 활용하여 투과면 FW-H 음향 상사법으로 노즐 모멘텀 소음을 구하고 기존 고정익 제트에 대한 경험식을 활용하여 제트 방사 소음을 얻었다. 검증 기체의 소음 측정값을 기준으로 해석 기법의 신뢰성을 검증하였고 스펙트럼 분석을 통해 팁젯 로터의 독특한 소음 특성을 확인하였다.
고정우,남진호,서광석 한국전기전자재료학회 2002 전기전자재료학회논문지 Vol.15 No.2
Space charge distributions and behaviors in silane crosslinked polyethylene(SXLPE)/ crosslinked polyethylene(XLPE) laminates were investigated using a pulsed electroacoustic (PEA) method. In case of monolayer, XLPE shows heterocharge while SXLPE shows homocharge. It was observed that charges were accumulated at the interface of SXLPE/XLPE laminate when applied electric field was more than 20kV/mm. The charge profile at various temperatures was also acquired using temperature-controllable PEA system. Although applied electric field is only 8.6 kV.mm, positive interfacial charge starts to appear near 50$^{\circ}C$. It was found that the interfacial charge behavior of SXLPE/XLPE laminate under low voltage at high temperature is corresponding to that under high voltage at room temperature.
고정우,김예진,류혜림,김민경,안초롱,김창무,박천석 한국균학회 2023 韓國菌學會誌 Vol.51 No.4
According to our previous study, 500 species of yeast exist in Korea, including nine variantscomprising 142 genera and 48 classes in two phyla. Additionally, 4,483 fungal species havebeen documented at the National Institute of Biological Resources (NIBR). However, despitethe industrial use of several yeasts, only 173 species formed part of the National Species Listof Korea (NSLK) as of December 2021, mainly due to the lack of taxonomic descriptions. Thisstudy aimed to investigate the taxonomy of seven newly isolated yeast species (Hyphopichiaburtonii , Starmerella sorbosivorans , Cyberlindnera mycetangii , Cutaneotrichosporonoleaginosum, Nakazawaea ernobii, Pichia kudriavzevii, and Schizosaccharomyces japonicus)for inclusion in the NSLK. The strains were clustered for the phylogenetic analysis of fungalrDNA (D1/D2-26S) sequences. This study provides descriptions of their cell morphology andphysiological characteristics, the results of which confirm the indigenous origin of theseseven species in Korea and recommend their inclusion in the NSLK.
XLPE/SXLPE 블랜드의 수트리 성장 및 절연파괴 특성
고정우,서광석 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.5
Crosslinked polyethlyene/silane crosslinked polyethylene(XLPE/SXLPE) blends were prepared by a twin screw extruder and their water tree growing electrical breakdown and crossinking characteristics were investigated. The water tree characteristics of XLPE were improved by the addition of SXLPE when samples were crosslinked only by the thermorolysis of DCP (dicumyl peroxide). However steam curing process was not good for water tree characteristics. It was also found that the rate of water tree growing of XLPE/SXLPE blend increased when the content of SXLPE was 50%. AC breadown strength slightly increaed by the addition of SXLPE to XLPE when samples were crosslinked only by the thermorolysis of DCP. It was also found that the degree of crosslinking of XLPE/SXLPE blends were higher than that of XLPE in the case of the content without steam crosslinking process.