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유기정(Ki-Jung Ryu),예휘열(Huee-Youl Ye),이상봉(Sang-Bong Lee),이관수(Kwan-Soo Lee),차우호(Woo-Ho Cha) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
This paper presents a numerical evaluation of the flow rate of air conditioner outdoor unit as function of shroud design parameters. To determine the optimal design parameters, we investigated the flow rate by changing bell mouth height, fan height, fan guide height, fan width. The evaluation of the relative priority of the design parameters was performed to choose three important parameters in order to use a response surface method. The flow rate of the optimum model, compared to that of the base model, was increased by about 6.25%.
유기정(Kijung Ryu),이관수(Kwan-Soo Lee) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.12
This paper presents a numerical optimization of louvered fins to enhance the JF factor in terms of the design parameters, including the fin pitch, the number of louvers, the louver angle, the fin thickness, and the re-direction louver length. We carried out a parametric study to select the three most important parameters affecting the JF factor, which were the fin pitch, number of louvers, and the louver angle. We optimally designed the louvered fin by using 3rd-order full factorial design, the kriging method, and a micro genetic algorithm. Consequently, the JF factor of the optimum model increased by 16% compared to that of the base model. Moreover, the optimum model reduced the pressure drop by 17% with a comparable heat transfer rate.
실외기 토출 유량 증대를 위한 Shroud 형상 및 휀 위치 최적 설계
유기정(Kijung Ryu),김유일(Yoo-Yil Kim),이관수(Kwan-Soo Lee),차우호(Woo-Ho Cha) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.11
This paper presents a numerical evaluation of the flow rate of air conditioner outdoor unit by investigating the effects of fan location and shroud shape. To determine optimal design parameters, we investigated the exhaust flow rate by changing shroud height, fan height, fan guide height, and fan width. The 3rd order central composite design was performed to select three most important parameters affecting the exhaust flow rate. According to the result of response surface method, the exhaust flow rate of the optimum model increased by 6.25% compared to that of the base model.
강결합 방식의 INS/GPS 시스템에서의 자세 오차 추정 성능 비교
유해성,김천중,유기정,이윤선,박흥원,Yu, Hae-Sung,Kim, Cheon-Joong,Yoo, Ki-Jeong,Lee, Youn-Seon,Park, Heung-Won 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.1
This paper addresses the performance comparisons of the GPS pseudorange and pseudorange rate measurements in the tightly coupled INS/GPS Navigation systems. Even though the two measurements have the same ability in estimating level attitude errors, pseudorange rate has an advantage in improving estimating heading attitude error performance. The performance of pseudorange and pseudorange rate measurements is compared in numerical simulations and van test.