• 제목/요약/키워드: W126

검색결과 252건 처리시간 0.034초

2008년 전력시장분석 (Analysis of electricity market in 2008)

  • 손기원;임채완;문경섭
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2009년도 제40회 하계학술대회
    • /
    • pp.595_596
    • /
    • 2009
  • '08년 전력시장에 참여한 정회원사수는 295개사(준회원포함 302개사)였고, 시장참여설비용량은 7,126만kW였다. 또한 전력거래량은 전년동기대비 4.8% 증가한 392,323GWh였으며, 거래금액은 전년동기대비 26.7% 증가한 26조 7,999억원이 정산되었다. 평균SMP는 122.63원/kWh, 정산단가는 68.31원/kWh였다.

  • PDF

실시간 자바를 이용한 HVDC Control and Protection 시스템 구현에 관한 고찰 (The study for implementation of HVDC Control and Protection system using realtime JAVA.)

  • 서민욱
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 2014년도 추계학술대회 논문집
    • /
    • pp.125-126
    • /
    • 2014
  • 본 논문에서는 실시간 자바를 사용하여 초고압 송전 설비의 제어 및 보호 장치의 구현에 대해 고찰 하고자 한다. 초고압 송전 설비는 대단위 시스템이라서 객체 지향 프로그래밍이 유리하지만, 실시간 운영체제 상에서 고속으로 실시간 동작을 해야 하므로 객체지향 프로그래밍이 모순 된다 할 수 있다. 실시간 자바를 통해서 대형 HVDC 시스템에서 객체 지향 설계의 유연함과 고속 실시간 시스템을 구현 할 수 있는 장점을 동시에 가질 수 있는 방법에 대해 고찰 해 보자.

  • PDF

VIS를 이용한 전기기기 특성 해석 (Characteristic Analysis of Motor using VIS)

  • 이인용;김양우;김영문
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2004년도 학술대회 논문집 전문대학교육위원
    • /
    • pp.126-129
    • /
    • 2004
  • This paper presents the way to analyze the static and dynamic characteristics of the Compound motor and 3 phase slip ring motor using VIS (Virtual Instrument System) and Agilent VEE, GUI(Graphics User Interface) tool. This method is composed of real time measuring of various characteristics, which can't measure using analog meter and analyzer, and presenting and analyzing the static and dynamic characteristics by table, which calculates the measured parameter. Also, this can apply to the various parts.

  • PDF

Internal Waves of a Two-Layer Fluid with Free Surface over a Semi-circular bump

  • Choi J. W.
    • 한국전산유체공학회:학술대회논문집
    • /
    • 한국전산유체공학회 1995년도 추계 학술대회논문집
    • /
    • pp.126-131
    • /
    • 1995
  • In this paper we study steady capillary-gravity waves in a two-layer fluid bounded above by a free surface and below by a horizontal rigid boundary with a small obstruction, Two critical speeds for the waves are obtained. Near the smaller critical speed, the derivation of the usual forced KdV equation (FKdV) fails when the coefficient of the nonlinear term in the FKdV vanishes. To overcome this difficulty, a new equation called a forced extended KdV equation (FEKdV) governing interfacial wave forms is obtained by a refined asymptotic method. Various solutions and numerical results of this equation are presented.

  • PDF

Magnetism in the Layered Structure Compound (C_18H_37NH_3)_2 MNCL_4

  • Lee, K. W.;Lee, C. H.;C. Rhee;Lee, Cheol-Eui;J. K. Kang;Lee, K.-S.
    • Journal of Magnetics
    • /
    • 제2권4호
    • /
    • pp.126-129
    • /
    • 1997
  • We have studied magnetostructural phase transitions in the perovskite-type layered structure compound (C18H37NH3)2 MnCl4 by means of electron paramagnetic resonance (EPR) and superconducting quantum interference device (SQUID) measurements. Distinct slopes were observed in the linear temperature dependences of the Mn++ EPR linewidth in the low and high temperature phases. Besides, linewidth anomalies at the transition temperatures sensitively reflect the magnetic changes arising from the MnCl6 octahedra.

  • PDF

연교의 파골세포 분화 및 골 흡수 억제 기전 연구 (Forsythiae Fructus Extract Inhibits RANKL-Induced Osteoclast Differentiation and Prevent Bone Loss in OVX-Induced Osteoporosis Rat)

  • 엄지환;김재현;김민선;김상우;신화정;정혁상;손영주
    • Korean Journal of Acupuncture
    • /
    • 제36권2호
    • /
    • pp.115-126
    • /
    • 2019
  • Objectives : Osteoporosis is a condition characterized by low bone mass and increased bone fragility. It has become a major problem of senior citizens. The purpose of this study is to experiment the effect of water extract of Forsythiae Fructus (wFF) on osteoclast differentiation; and the other purpose is to examine the effect of wFF on osteoporosis in ovariectomized rat. Methods : To investigate the effect of wFF on osteoclast differentiation and activity, RAW 264.7 cells were used. The number of TRAP positive cell, TRAP activity, pit area, mRNA expression of makers (RANK, TRAP, CA II, CTK, MMP-9, NFATc1, c-Fos), protein expression of makers (NFATc1, c-Fos) were investigated. For in vivo study, 40 female Sprague-Dawley (SD) rats were induced osteoporosis by ovariectomy (OVX) and then tested for anti-osteoporosis effect by administration of wFF. Results : wFF suppressed osteoclatogenesis, TRAP activity and pit area formation. Moreover, wFF decreased the expression of master differentiation factors (NFATc1, c-Fos) and also reduced the osteoclastogenesis-related markers (TRAP, CA II, CTK, MMP-9). These suggest that wFF inhibit osteoclasts differentiation and bone resorption. In the OVX rat model, wFF inhibited decreasing of BMD and trabecular area. Conclusions : Forsythiae Fructus should be effective for osteoporosis prevention and treatment.