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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.
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李東炫 中央醫學社 1972 中央醫學 Vol.22 No.2
This is report of a case of primary mucocele occurring in the left maxillary sinus, which is supposed to be rare. This 32 years old male entered to the National Police Hospital on Oct. 2-1971 with complaints of a palpable mass in the left cheek. The external examination revealed that a walnut sized, moderately hard, and sound shaped mass which has slight fluctuation, was palpated on the left7 maxillary; region, however no tenderness could be demonstrated. Aspiration of the contents disclosed chocolate colored mucoid fluid, and negative finding were detected, in the nasal cavity by ant rhinoscopy. X-ray study of maxillary sinus showed slight cloudiness over the left maxillary sinus, without definite evidence of the bone destruction. Under suspiction of maxillary cyst exploratory operation(caldwell-luis operation approach) was performed and found that a large mucocele of maxillary sinus which, involving the ant and medical bony wall of the sinus. The whole mucosa was carefully separated and removed and a wide enough counter opening was made. Post operative course was satisfactory and no undesirabe sequela occurred up to date.
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이동현,김병옥,전병찬,임형수 한국트라이볼로지학회 2023 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.39 No.6
A rotordynamic system consists of components that undergo rotational motion. These components include shafts, impellers, thrust collars, and components that support rotation, such as bearings and seals. The motion of this type of rotating system can be modeled as two-dimensional motion and, accordingly, the equation of motion for the rotordynamic system can be represented using complex coordinates. The directional frequency response function (dFRF) can be derived from this complex coordinate system and used as an effective analytical tool for rotating machinery. However, the dFRF is not widely used in the field because most previous studies and commercial software are based on real coordinate systems. The objective of the current study is to introduce the dFRF and show that it can be an effective tool in rotordynamic analysis. In this study, the normal frequency response function (nFRF) and dFRF are compared under rotordynamic analysis for isotropic and unisotropic rotors. Results show that in the nFRF, the magnitude of the response is the same for both positive and negative frequencies, and the response is similar under all modes. Consequently, the severity of the mode cannot be identified. However, in the dFRF, the forward and backward modes are clearly distinguishable in the frequency domain of the isotropic rotor, and the severity of the mode can be identified for the unisotropic rotor.
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이동현,김현종,김중곤,이동준,최예빈,박소연,양병준,정종민 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.2
This study was conducted to investigate the operational status of 12 pig farms that compost using an enclosed composting system and to evaluate the stability of the compost produced. Land scale, pig house scale, animal numbers, reactor capacity, manure input, retention time, maturation scale, maturation days, liquid manure treatment, and scrubber installation were surveyed, and material properties of pig manure were investigated to analyze changes at three points (Input, Output, Maturation). Manure water content, pH, elemental analysis (C, N, S, H, O), total solids, volatile solids, organic matter, and gemination indices were analyzed. Analysis results provided information on how pig farms operate. In addition, as composting progressed, germination indices increased, indicating material stabilization; however, material properties did not change significantly as maturation progressed. The study provides an understanding of the basic operating methods of enclosed composting systems and of changes in pig manure properties.
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함정용 다기능 레이다 전원공급기의 능동형 역률 개선 방안
이동현,장상인,신동석 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.2
The multi-function radar of surface ships is configured with four faces, enabling detection and tracking in all directions as a fixed radar system. The radar requires an independent power system configuration for each face, and maximum power consumption accounts for a significant portion of the total power consumption of surface ships. Therefore, to ensure the efficient power operation of surface ships, radar power conversion devices must have a power factor control functionality to reduce harmonics during AC to DC power conversion. This paper proposes an active power factor correction method using a Vienna rectifier to address these problems. This rectifier can control the reactive power by detecting the magnitude, phase, and frequency of three-phase power, thus enabling synchronized control of the three-phase AC voltage and current. Moreover, due to the high-speed switching control provided by power semiconductor devices, such as MOSFET and IGBT, the input current can be controlled to closely resemble a sinusoidal waveform, thereby minimizing low-order harmonics that impact the power system, which would allow the radar system to achieve a high power factor under all load conditions and enable the efficient power operation of surface ships.
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