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박재철,장문석,이창식,Park, J.C.,Jang, M.S.,Lee, C.S. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.3
The purpose of this paper is to obtain enthalpy balance and exergy analysis for the energy losses in a steam power plant. The enthalpy and exergy analysis of the steam power plant were carried out on the various output of steam turbine. While enthalpy analysis shows that circulating loss in the condenser is maximum, exergy evaluation of the power plant shows that the losses of the boiler and turbine are considerably larger than those of condenser and feed water heater. Most irreversible losses of the power plant occur at the boiler. For improving the performance, the precise study about the irreversible losses of the boiler is necessary.
박재철(J. C. Park),홍성태(S. T. Hong),방근태(K. T. Bang) 한국진공학회(ASCT) 1994 Applied Science and Convergence Technology Vol.3 No.1
MWPECVD법으로 CH₃CHO-H₂계와 CH₄H₂-O₂계로부터 Si기판 위에 다이아몬드박막을 성장시키고, 성장된 박막을 SEM, XRD 및 Raman 분광기로 평가하고, 박막과 입자의 성장율을 조사하였다. 마이크로파전력 950W, 반응관압력 80 torr, 수소유량 200 sccm, 기판온도 950℃ 및 CH₃CHO 농도 3.5%로 5시간 성장시킨 다이아몬드의 박막성장율은 4 ㎛/hr가 되었고, 12%<O₂/CH₃CHO<14%의 산소농도에서 비다이아몬드상 탄소성분을 가장 효과적으로 에칭할 수 있음을 추정할 수 있었다. 마이크로전력 800 W, 반응관압력 80 torr, 수소유량 80 sccm, 메탄농도 7%, O₂/CH₄ 농도 40% 및 기판온도 960℃로 Si기판 위에 5시간 성장시킨 다이아몬드의 박막성장율은 3.2 ㎛/hr가 되었다. Diamond thin films were deposited on Si substrate from CH₃CHO-H₂ system and CH₄-H₂-O₂ system by MWPECVD, and the deposited films were identified by SEM, XRD and Raman spectroscopy, and the growth rate was investigated. The growth rate of diamond films was 4 ㎛/hr and it of diamond particles was 11.5 ㎛/hr at the condition of power: 950 W, pressure: 80 torr, H₂ flow rate: 200 sccm, substrate temp.: 950℃ and CH₃CHO concentration: 3.5% and deposition time: 5 hr. It was deduced that etching of non-diomand phase carbon components was the most effective at 12%<O₂/CH₃CHO<14% of O₂ concentration. The growth rate of diamond films was 3.2 ㎛/hr at the condition of power: 800 W, pressure: 80 torr, H₂ flow rate: 80 sccm, substrate temp.: 960℃, CH₄ concentration: 7%. O₂/CH₄ concentration: 40% and deposition time: 5 hr.
강규민,박재철,최수나,유성진,황성현,변우진,Kang, K.M.,Park, J.C.,Choi, S.N.,You, S.J.,Hwang, S.H.,Byun, W.J. 한국전자통신연구원 2018 전자통신동향분석 Vol.33 No.3
This article presents spectrum sharing policy trends both overseas and domestically. The Federal Communications Commission recently adopted rules for the commercial use of a 150 MHz bandwidth at 3.55 to 3.7 GHz, which has been utilized for defense and satellite services. This frequency band for spectrum sharing is called the citizens broadband radio service (CBRS) band. In Europe, the related regimes for licensed shared access application at 2.3 to 2.4 GHz has been organized, and interface standardization for sharing frequency information has been completed. In Korea, efforts are being made to establish spectrum-sharing policies to improve the efficiency of the frequency utilization. This article also introduces both the IEEE 802 local area network/metropolitan area network and 3GPP standardization activities with regard to frequency sharing technologies. To effectively solve the spectrum-sharing problem in IEEE 802, standardization activities on the CBRS and the mid-band (3.7-24 GHz) are underway. 3GPP is currently developing the standardization of a licensed assisted access technology, which extends mobile communication services provided in the licensed band to unlicensed bands.