• Title/Summary/Keyword: 양정

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Assessment of the Generators Constant from Frequency Response Properties of Korean Power System (우리나라 계통의 주파수응답특성에 의한 발전기정수 산정에 관한 연구)

  • Jeong, Bong-Sang;Chun, Yeong-Han;Kim, Il-Dong;Yang, Jeong-Jae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.4
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    • pp.688-693
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    • 2009

  • The response characteristics of power system frequency are determined by generator droop characteristics and load damping properties. The characteristics of governor droops are termed by generators constant, while those of load damping by load constant. In this paper, the generator constant and the load constant are assessed by measured data at the event of generator trips.

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Automatic Mesh Generation Method in Shallow Water Area considering Water Depth (수심을 고려한 천해역에서의 자동요소 생성법)

  • 김남형;양정필;박상길
    • Journal of Korean Port Research
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    • v.14 no.1
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    • pp.97-105
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    • 2000

  • This paper presents an automatic mesh generation considering water depth, which is based on the depth interpolation. The key feature of this method is that the position of a mesh on any depth in the shallow water area can be generated. The Examples are carried out, and the results are shown to be good. This method is shown to be a useful and powerful tool for the flow calculation for the seabed topography.

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Injection Characteristics with Valve Geometries for a Diesel Engine (디젤기관용 분사밸브 형상에 따른 분사특성)

  • 김성윤;오승우;박권하
    • Journal of Advanced Marine Engineering and Technology
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    • v.27 no.6
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    • pp.745-752
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    • 2003

  • Injection technology is one of the important technologies in a diesel engine. Many studies have done on the injection system. In this study, the fuel chamber geometry, the orifice ratio and the needle lift of the injection valve of a diesel engine for generating electricity are varied and tested. The injection pressure, duration and spray shapes are produced with pressure transducer, needle lift sensor and highspeed camera. The result shows that the nozzle hole size has influence on the rail pressure and injection duration sensuously.

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Characterization of partially functionalized diamond for detecting single mismatched DNA (부분적 기능화된 다이아몬드를 이용한 single mismatched DNA 검출 특성)

  • Yang, Jung-Hoon;Song, Kwang-Soup
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.4
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    • pp.29-33
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    • 2013

  • Here we report a partially aminated micropattern via direct functionalization and examine eleven different solution-phase probe DNAs hybridizing with the same target DNA on both hydrogen and oxygen terminated diamond. The hybridization intensities determined by epifluorescence microscopy were compared and are influenced strongly by the negatively charged surface and mismatched position of its sequence with immobilized probe DNA.

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Vibration Analysis of Rotating Cantilever Plates with a Concentrated Mass (집중 질량을 가진 회전하는 외팔 평판의 진동 해석)

  • 양정식;유홍희
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1998.04a
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    • pp.181-186
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    • 1998

  • A modelling method for the vibration analysis of rotating cantilever plates with a concentrated mass is presented. The equations of motion for the rotating plates with a concentrated mass located in an arbitrary position are derived. For the modelling of the concentrated mass, a mass density Dirac delta function is used. The effects of concentrated mass and its location, angular speed, and hub radius of the rotating plate on the natural frequencies are studied. Particularly, mode shape variations due to some parameter variations are investigated.

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