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순음성 소음의 분산을 위한 부등간격 블레이드 설계 연구
김완기,윤종학,한성수,전세종,성형진,Kim, Wan-Gi,Yun, Jong-Hak,Han, Seong-Su,Jeon, Se-Jong,Seong, Hyeong-Jin 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.4
A numerical simulation was made to delineate the re-distribution of tonal noise generated from the equally-spaced blade passing frequency (BPF). A pressure-wave model was employed to analyze the tonal noise. An optimal solution for diversifying the tonal peak noise was obtained by rearranging the unequally-spaced blade angles. This was based on the fact that the noise energy is transferred from BPF to the neighboring frequency band. A limit condition for the minimum blade angle spacing was imposed. The unbalancing problem was also considered to avoid the weight bias.
초음파와 자외선 연계공정을 이용한 Mycobacterium 불활성화
김완기 ( Wan Gi Kim ),정연정 ( Yeon Jung Jung ),윤여준 ( Yeo Joon Yoon ),임관훈 ( Gwan Hun Lim ),김종배 ( Jong Bae Kim ),강준원 ( Joon Wun Kang ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.1
In this study, the inactivation efficiency of Mycobacterium marinum was evaluated in buffered water (pH 7) using a low pressure ultraviolet (LP-UV) lamp, ultrasonic (US), and UV/US sequential processes. In the UV alone process, 3 log inactivation of the M. marinum was achieved with a UV dose of 120 mJ/cm2. However, a tailing phase was later observed because M. marinum has a high tendency for cell aggregation. Even though the M. marinum was not inactivated in the US alone process, the hydrophobicity decreased and turbidity increased due to the crumbling of the cell aggregation. Among the candidate processes which were UV alone, US-UV sequential process and UV-US-UV sequential process, the US-UV sequential process showed the highest synergistic effects for M. marinum inactivation. Consequently, US is a very useful process as a UV irradiation pre-treatment to inactivate M. marinum in water.
김완기(Wan-Gi Kim),이준엽(Joon-Yeob Lee),권중록(Jung-Lock Kwon),김해천(Hea-Choen Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The crude oil pump system is the equipment for transporting crude oil and it consists of 3 major components, a motor and an impeller which discharge underground crude oil, a pipestack that transmits the cooling oil and power, and a cooling oil unit & junction box that provides cooling oil and electric power. When considering the system characteristics that it has to be installed at a depth of deeper than 100 m, a design technology for the efficient control of the heat occurring at a conductor and motor is necessary and it is the essential factor for ensuring system durability. In this paper, therefore, cooling oil flow has been calculated to satisfy the limit value of the system temperature by analyzing heat flow considering the related losses such as loss of conductor, contact resistor loss at the conductor connection, and operation loss of motor. And the operation temperature has been set up based on the temperature of crude oil and the heat of motor and conductor. Also, a design for cooling of crude oil pump system has been proposed by calculating the operation pressure loss and selecting the capacity of a cooling oil pump and a heat exchanger.