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이동현,Lee, Dong-Hyeon 대한수의사회 2012 대한수의사회지 Vol.48 No.2
저는 "동물병원 노무관리"라는 제목으로 강의를 할 노무법인 대명 소속의 이동현 노무사입니다. 본 강의는 노동법의 범위가 광대하므로 주요 노동법 규정을 알아봄으로써 동물병원 현장의 인사노무관리에 적극 활용할 수 있고 이를 통해 합법적이고 효율적인 인사노무관리를 함으로써 상생, 협력하는 노사 관계를 구축하고 기업경쟁력을 강화하는데 보탬을 됨을 목적으로 합니다. 설명의 순서는 5인 미만 즉 4인 이하 사업장에서 꼭 지켜야 할 주요 노동법규정 과 5인 이상 사업장에서 꼭 지켜야 할 주요노동법규정을 나누어 설명하도록 하겠습니다.
초임계 CO<sub>2</sub> 발전용 파워 터빈의 회전체 동역학 해석 및 구동 시험
이동현,김병옥,선경호,임형수,Lee, Donghyun,Kim, Byungok,Sun, Kyungho,Lim, Hyungsoo 한국트라이볼로지학회 2017 한국윤활학회지(윤활학회지) Vol.33 No.1
This paper presents a rotordynamic analysis and the operation of a power turbine applied to a 250 kW super-critical $CO_2$ cycle. The power turbine consists of a turbine wheel and a shaft supported by two fluid film bearings. We use a tilting pad bearing for the power turbine owing to the high speed operation, and employ copper backing pads to improve the thermal management of the bearing. We conduct a rotordynamic analysis based on the design parameters of the power turbine. The dynamic coefficients of the tilting pad bearings were calculated based on the iso-thermal lubrication theory and turbine wheel was modeled as equivalent inertia. The predicted Cambell diagram showed that there are two critical speeds, namely the conical and bending critical speeds under the rated speed. However, the unbalance response prediction showed that vibration levels are controlled within 10 mm for all speed ranges owing to the high damping ratio of the modes. Additionally, the predicted logarithmic decrement indicates that there is no unstable mode. The power turbine uses compressed air at a temperature of $250^{\circ}C$ in its operation, and we monitor the shaft vibration and temperature of the lubricant during the test. In the steady state, we record a temperature rise of $40^{\circ}C$ between the inlet and outlet lubricant and the measured shaft vibration shows good agreement with the prediction.
초임계 CO<sub>2</sub> 발전용 파워터빈을 지지하는 틸팅패드 베어링의 열윤활 해석 및 패드 온도 측정
이동현,김병옥,임형수,Lee, Donghyun,Kim, Byungok,Lim, Hyungsoo 한국트라이볼로지학회 2018 한국윤활학회지(윤활학회지) Vol.34 No.2
This paper presents the thermohydrodynamic analysis of tilting journal pad bearings supporting a power turbine rotor applied to a 250 kW super-critical $CO_2$ cycle. In the analysis, the generalized Reynolds equation and 3D energy equation are solved to predict oil film temperature and the 3D heat conduction equation is solved for pad temperature. The power turbine rotor is supported by two tilting pad bearings consisting of five pads with an oil supply block between the pads. Copper backing pads with higher thermal conductivity compared to steel backing pads are adopted to improve thermal management. The predicted maximum pad temperature is around $55^{\circ}C$ which is approximately $15^{\circ}C$ higher than oil supply temperature. In addition, the predicted minimum film thickness is 50 mm at a rotating speed of 5,000 rpm. These results indicate that there is no issue in the thermal behavior of the bearing. An operation test is performed with a power turbine module consisting of a power turbine, a reduction gear and a generator. Thermocouples are installed at the 75% position from the leading edge of the pad to monitor pad temperature. The power turbine uses compressed air at a temperature of $250^{\circ}C$ in its operation. The steady state pad temperatures measured in the test show good agreement with the predicted temperatures.
Convergence of Acupoint and Electrical Stimulation Therapy for Blood Flow and Pain Threshold
이동현,김범룡,허윤정,김동훈,심수영,임종은 한국융합학회 2019 한국융합학회논문지 Vol.10 No.6
This study examined how the application of silver spike point (SSP) and acupuncture-like transcutaneous electrical nerve stimulation (A-TENS) on acupoints affects blood flow and pain threshold, using laser Doppler blood fluxes and the Commander algometer. Our study included 32 healthy men and women who were randomly divided into the SSP group (n=18) and the A-TENS group (n=14). The pain threshold and blood flow were measured at the Neiguan (PC6) of the Jueyin Pericardium Meridian of the hand. SSP was performed with a 2.8cm electrode at a fixed frequency of 3 Hz for 15 minutes. The change in blood flow and pain threshold after the intervention significantly differed between the two groups (p<0.05). We found that the application of SSP and A-TENS on an acupoint altered their blood flow and pressure pain threshold, with SSP resulting in significantly greater change than A-TENS. Based on these results, the convergence of acupoint and electrical stimulation therapy can be usefully applied as a method for various patients. Continued development of convergence interventions is necessary.