• Title/Summary/Keyword: Geuk

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Parameter Tuning of Wireless Charging Circuit using Switched-Capacitor (스위치드-커패시터를 이용한 무선충전회로의 파라미터 튜닝)

  • Kim, Myoung-Su;Kang, Byeong-Geuk;Chung, Se-Kyo
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.315-316
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    • 2013
  • This paper presents a parameter tuning method of a LLC resonant converter for a wireless charging circuit. A switched-capacitor is used to change the resonant frequency of the resonant circuit. The simulation results verify that the efficiency of the power transfer can be improved by a duty control of the switched-capacitor for various values of the coupling coefficient.

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BF Gray Quadtree : Efficient Image Representation Method (Breadth First Gray Quadtree:화상의 효율적 표현법)

  • Lee, Geuk;Lee, Min-Gyu;Hwang, Hee-Yeung;Lee, Jung-Won
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.39 no.5
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    • pp.494-499
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    • 1990
  • A new compact hierarchical representation method image is proposed. This method represents a binary image with the set of decimal numbers. Each decimal number represents the pattern of nonterminal node(gray node) in the quadtree. This pattern implies the combination of its four child nodes. The total number of gray nodes is one third of that terminal nodes. We show that gray tree method is efficient comparing with others which have been studied.

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Loss Minimization of DFIG for Wind Power Generation

  • Abo-Khalil, Ahmed G.;Park, Hong-Geuk;Lee, Dong-Choon;Lee, Se-Hyun
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.315-317
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    • 2007
  • This paper proposes a loss minimization algorithm for doubly-fed induction generator (DFIG) by controlling the stator reactive power. The proposed strategy directly controls the rotor current to achieve the operating point of minimum generator loss and maximum power point tracking. The maximum power is obtained by tracking the q-axis rotor current with generator speed variation and the minimum generator loss is achieved by controlling the d-axis rotor current. Experimental results are shown to verify the validity of the proposed scheme.

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Analysis of Interleave Effect for Toroidal Type Transformer Windings (토로이달 타입 변압기 권선의 Interleave 효과 분석)

  • Shin, Kyoung-Gu;Kang, Byeong-Geuk;Lee, Kuk-Hee;Chung, Se-Kyo
    • Proceedings of the KIPE Conference
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    • 2014.07a
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    • pp.329-330
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    • 2014
  • This paper presents an analysis of the interleaved effects for the secondary winding distribution of a toroidal transformer. The equations to calculate the leakage inductance are derived using the MMF diagram for the distributed secondary windings. The simulation and experimental results are provided to show the effect of the leakage inductance reduction.

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LCL Filter Design for AC Source Interface of PWM Converter (PWM 컨버터의 교류 전원 인터페이스를 위한 LCL 필터 설계)

  • Cho, Byung-Geuk;Lee, Hak-Jun;Sul, Seung-Ki
    • Proceedings of the KIPE Conference
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    • 2010.11a
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    • pp.3-4
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    • 2010
  • 본 논문에서는, PWM 컨버터의 교류 전원 인터페이스를 위한 LCL 필터 설계에 대해 기술한다. 새로운 형태의 LCL 필터 전류 제어기를 소개하고 기존의 전류 제어 방식을 통한 필터 설계 값에 제안된 제어 기법을 적용 시켜 전류 제어 결과를 분석한 후, 제안된 제어기를 통한 필터 설계 측면에서의 유연성 및 용이함에 대해 언급한다. 분석의 타당성을 입증하기 위해 모의 실험 결과를 첨부하였다.

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The Study of Dietary Culture in East Cot Area in Kyungpook Province (II) - for Sacrificial Rites Foods - (경북 동해안 지역 식생활 문화에 관한 연구(II) - 제례 음식 -)

  • Yoon, Suk-Kyung;Park, Mi-Nam
    • Journal of the Korean Society of Food Culture
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    • v.14 no.2
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    • pp.83-102
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    • 1999
  • The several sacrificial rites foods in east coast areas Kyungpook province, Pohang, Youngduk, and Uljin, were surveyed. For the anniversary menorial service, the food items in these reas were mainly rice(Bab'), soup(Guk'), stew(Tang'), fruits, neats and fishes, alcohol which are the typical food items for any other area in Korea. In this east coast area, the seaweed was used more often than in inner land area for this rite food. Four kinds of rice cake(Ddeok' or Pyun') were surveyed for this rite. For the baked food item(Geuk'), the fish squid and the Alaska pollack were used frequently for Geuk'. For the fruits dishes, 3 items were the basic. Tang' which was made with the various fishes, were used very frequently. For the religious memorial service for god to guard the household, the displayed food items were different from depending on the type of the god to guard the household, however, the general display of the food items was almost the same as in land area. For the winter sacrificial rite, the boiled rice(97%) and Bakpyun' was used mostly for the Ddeok'. For the Guk', bean sprout was used mostly, however, the seaweed soup was also used(7%). The fish Tang' was the most used one(35%). For young-deung-je', which implied th safe guard of the household, most of the food items are similar to those of the normal sacrificial rite, however, the fishes which were not fishy were used. The housekeeper arranged the rite to catch a large amount of the fishes and to hope the wellbeing of the household, Poong-yer-je is so called as Byul-sin-gud'(a practice of an exorciser). The food items for this Poong-yer-je' were almost similar to those of the winter sacrificial rite, however, Geulpyun' was mostly used for the Pyun'. In addition that, the red-bean Si-ruddock', Baekpyun', and Yung-ddock'(a dragon cake) were used for this rite, At the end of the sacrificial rite, Yong-ddock' was served to the dragon king which was believed in sea.

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List of Korean Names for the Vascular Plants in Spitsbergen Island, in the Arctic Region (북극권 스피츠베르겐 섬의 관속식물 국명 목록)

  • Lee, Kyoo;Han, Dong-Uk;Hyun, Jin-Oh;Hwang, Young-Sim;Lee, Yoo-Kyung;Lee, Eun-Ju
    • Ocean and Polar Research
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    • v.34 no.1
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    • pp.101-110
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    • 2012
  • In this study, we attempted to provide Korean names to the arctic vascular plants observed around the Dasan Korean Arctic Station and Longyearbyen in Spitsbergen Island, in the Arctic region. To obtain recognizable results, plants were named according to the following naming rules. (1) When Korean names already existed, those names were used. (2) When there was no Korean name for a plant species, a scientific name for the plant was translated into a Korean name. (3) If the meaning of the scientific name was unclear, an English common name was translated into Korean name. (4) If the scientific names had meaning to the Arctic inhabitation, the Korean names included the word 'Buk-geuk'. (5) If the distribution of the plant was limited to the Arctic area or the original species lived in the polar region, the Korean name included the word 'Buk-geuk'. (6) If the plant had no Korean generic name, a particular suffix '~a-jae-bi' was added to the closely related genus name of the plant species, or a new Korean genus name was used by translating a common English name. (7) If the same generic name had two or more Korean names, a generic name that better reflected the characteristics of the plant was selected. In this paper, we reported Korean names for 46 plants species belonging to 15 families and 28 genera. Eight plants had an existing Korean name and the other species were given new Korean names based on the criteria outlined above. We also made new Korean generic names for three genera, Braya, Micranthes and Cassiope.

The Electrical Characteristics of The Modules According to The Environment of The Floating Photovoltaic System (수상태양광 발전 시스템의 환경에 따른 모듈의 전기적 특성)

  • Hwang, Soo Hyun;Lee, Dong Yeong;Kwon, O geuk;Lee, Jae Hyeong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.31 no.5
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    • pp.283-289
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    • 2018
  • In our study, we collected data from a 100 kW floating photovoltaic (PV) system installed in Gyeongnam Hapcheon Dam and observed correlations between the power generation of the floating PV system and the irradiance, water temperature, humidity, ambient temperature, wind speed, and module temperature. Firstly, there was little correlation between the water temperature and power generation. Secondly, the ambient temperature, wind speed, and humidity all showed greater correlations with power generation. Finally, the power generation was very highly correlated with the irradiance and module temperature. In conclusion, the power generation of the floating PV system is related individually to environmental factors.

Plasma Dechucking Process를 이용한 Dynamic Alignment Error 개선

  • Yu, Jin-Gyun;Chae, Min-Cheol;Yun, Jeong-Bong;Kim, Jong-Geuk
    • Proceedings of the Korean Vacuum Society Conference
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    • 2016.02a
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    • pp.203.1-203.1
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    • 2016
  • Poly etch 설비에서 발생하는 dechuck 불량에 의한 Dynamic Alignment(DA) error는 poly etch 설비에서의 고질 적인 문제이다. 발생 원인은 ElectroStatic Chuck(ESC)의 노후화 혹은process plasma에 의한 attack 등으로 ESC와 wafer간 dechucking이 진행될 때 wafer내의 전하가 완전히 discharge되지 못하여 wafer Sticking에 의한 sliding이 발생되며 심해지면 Dynamic Alignment(DA) Error가 발생한다. DA error 발생 되면 particle down으로 wafer는 scrap 되며 DA error가 지속적으로 발생하는 설비는 ESC 교체를 하고 있다. ESC 교체비용도 매우 크며 교체 전까지 설비가 멈추어있는 시간적인 손실이 발생하게 된다. Dechucking을 진행할 때 Wafer에 잔존하는 전하를 제거 하여 Wafer의 sticking을 줄여 DA error를 근원적으로 방지하기 위해 plasma를 이용하여 wafer와 ESC를 하나의 electric circuit으로 연결시키는 방법으로 wafer에 잔존하는 전하를 제거 시키고자 하였다.

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