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박철훈(Cheol Hoon Park),윤태광(Tae-Gwang Yoon) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.4
For special materials such as tempered glass, ceramics and silicon, micro-holes less than 1 mm in diameter are generally machined through drilling using high speed spindles, but their productivity is very low due to slow machining speed. Further, when a plurality of fine holes are machined on a large-area wafer, if the machining drill is damaged and any machining failure occurs, the entire wafer becomes defective and the cost loss becomes large. In the field, maintenance costs are very high because drills are replaced periodically to avoid these defects. Applying a magnetic bearing to the spindle for micro-hole machining eliminates friction and wear between the bearing and the rotor, eliminating the need for bearing maintenance. In addition, the control current of the magnetic bearings can monitor the drill abrasion and machining conditions to prevent unconditional drill replacement, thus reducing maintenance cost and preventing machining failure. In this paper, we designed and fabricated 80 000 r/min micro-hole machining spindle equipped with magnetic bearings, and presented rotational and machining test results.
박철훈(Cheol Hoon Park),함상용(Sang Yong Ham),홍두의(Doo Euy Hong),김준규(Jun Kyu Kim) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.12
Most of spindles for machine tool are supported by ball bearings, and there are problems in the limits of high speed and high power as well as the cumbersome maintenance due to the short life time. In order to overcome these problems of the conventional spindles, the high speed spindle with magnetic bearings is developed in this study. Magnetic bearings for 60 000 r/min class high-speed spindle are designed, and high speed spindle with magnetic bearings are fabricated. Based on the running test up to 60 000 r/min, it is verified that the spindle is stably supported by the magnetic bearings, and the magnitude of the unbalance response at 60 000 r/min is less than 3 μm.
조기분만과 TNF-α 및 IL-1β 유전자의 다형성과의 연관성
박철훈 ( Cheol Hoon Park ),박인양 ( In Yang Park ),고현선 ( Hyun Sun Ko ),안현영 ( Hyun Young Ahn ),김수평 ( Soo Pyung Kim ),신종철 ( Jong Chul Shin ),김연희 ( Youn Hee Kim ),이귀세라 ( Gui Se Ra Lee ),이희중 ( Hee Joong Lee ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.12
Objective : To elucidate whether polymorphisms of tumor necrotic factor-α (TNF-α) and interleukin-1β (IL-1β) are associated with preterm delivery caused by preterm labor and preterm premature rupture of membrane (PPROM) in korean pregnant women. Methods :