• Title, Summary, Keyword: Transfer stability

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An Analysis of Thermal Convection in Agricultural-Products Storge System (농산물 저장 시설에서의 열대류 현상의 해석)

  • Kim, Min-Chan;Hyeon, Myeong-Taek;Go, Jeong-Sam
    • Korean Journal of Food Preservation
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    • v.4 no.1
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    • pp.27-32
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    • 1997
  • Natural convection in agricultural-products storage system was analysed theoretically, The storage system was modelled by Internally heated fluid saturated porous layer. Darcy's law was used to explain characteristics of fluid motion. Stability equations were obtained under the linear stability theory and transfer characteristics were modelled by the shape assumption. Based on the modelling of transfer characteristics, heat trasnfer correlations were derived theoretically.

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Transfer Capability Enhancement Using Voltage Source Converter HVDC (전압원 HVDC를 이용한 부하집중지로의 송전용량 증대방안)

  • Oh, Sea-Seung;Jang, Gil-Soo;Cha, Jun-Min
    • Proceedings of the KIEE Conference
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    • pp.328-330
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    • 2005
  • This paper presents a transfer capability enhancement of using VSC HVDC system which can control reactive power as well as active power. The transfer capability is constrained by stability like voltage stability. These constraints may relieved by reactive power control ability of the VSC HVDC system. Site selection algorithm is also proposed.

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The Onset of Natural Convection and Heat Transfer Correlation in Horizontal Fluid Layer Heated Uniformly from Below

  • Kim, Min-Chan;Kim, Sin
    • Journal of Mechanical Science and Technology
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    • v.15 no.10
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    • pp.1451-1460
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    • 2001
  • The critical condition of the onset of buoyancy-driven convective motion of uniformly heated horizontal fluid layer was analysed by the propagation theory which transforms the disturbance quantities similarly. The dimensionless critical time, $\tau$$\sub$c/, is obtained as a function of the Rayleigh number and the Prandtl number. Based on the stability criteria and the boundary-layer instability model, a new heat transfer correlation which can cover whole range of Rayleigh number was derived. Our theoretical results predict the experimental results quite reasonably.

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A Normalized Loss Function of Style Transfer Network for More Diverse and More Stable Transfer Results (다양성 및 안정성 확보를 위한 스타일 전이 네트워크 손실 함수 정규화 기법)

  • Choi, Insung;Kim, Yong-Goo
    • Journal of Broadcast Engineering
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    • v.25 no.6
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    • pp.980-993
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    • 2020
  • Deep-learning based style transfer has recently attracted great attention, because it provides high quality transfer results by appropriately reflecting the high level structural characteristics of images. This paper deals with the problem of providing more stable and more diverse style transfer results of such deep-learning based style transfer method. Based on the investigation of the experimental results from the wide range of hyper-parameter settings, this paper defines the problem of the stability and the diversity of the style transfer, and proposes a partial loss normalization method to solve the problem. The style transfer using the proposed normalization method not only gives the stability on the control of the degree of style reflection, regardless of the input image characteristics, but also presents the diversity of style transfer results, unlike the existing method, at controlling the weight of the partial style loss, and provides the stability on the difference in resolution of the input image.

A Study on Transient Stability Augmentation by Transfering Line and Bus (송전선 절체제어에 의한 전력계통 안정화 연구)

  • Suh, Eui-Suk;Oh, Tae-Kyoo;Han, Hoo-Sek
    • Proceedings of the KIEE Conference
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    • pp.1029-1032
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    • 1998
  • This paper presents the scheme of bus and line transfer for improving transient stability and the reactive transient stability index usable in time simulation. And also multi-transferring scheme for improving damping is proposed. These results can be applied in determining the effective position for transfer control.

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A Study on Transient Stability Augmentation by Transfering Line and Bus (송전선 절체제어에 의한 전력계통 안정화 연구)

  • Suh, Eui-Suk;Oh, Tae-Kyoo;Han, Hoo-Sek
    • Proceedings of the KIEE Conference
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    • pp.681-684
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    • 1998
  • This paper presents the scheme of bus and line transfer for improving transient stability and the relative transient stability index usable in time simulation. And also multi-transferring scheme for improving damping is proposed. These results can be applied in determining the effective position for transfer control.

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A Study on Transient Stability Augmentation by Transfering Line and Bus (송전선 절체제어에 의한 전력계통 안정화 연구)

  • Suh, Eui-Suk;Oh, Tae-Kyoo;Han, Hoo-Sek
    • Proceedings of the KIEE Conference
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    • pp.361-364
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    • 1998
  • This paper presents the scheme of bus and line transfer for improving transient stability and the relative transient stability index usable in time simulation. And also multi-transferring scheme for improving damping is proposed. These results can be app1ied in determining the effective position for transfer control.

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Hole Transfer Layer p-doped with a Metal Oxide for Low Voltage Operation of OLEDs

  • Shin, Won-Ju;Lee, Je-Yun;Kim, Jae-Chang;Yoon, Tae-Hoon;Kim, Tae-Shick;Song, Ok-Keun
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.435-438
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    • 2007
  • $V_{2}O_{5}$ was tested as a p-dopant for lower operating voltage and higher stability of OLEDs. Low voltage and high stability were achieved using this doping layer. It can be separated to bulk and interface contributions and the latter is a more dominant factor both of operation voltage and stability.

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A Study on The Available Transfer Capability(ATC) with Transient Stability Constraints (과도 안정도를 고려한 가용송전용량(ATC) 계산에 관한 연구)

  • Kim, Yang-Il;Jeong, Sung-Won;Gim, Jae-Hyeon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.3
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    • pp.437-443
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    • 2009
  • In recent years, electric power systems have been experiencing a rapid change due to the increasing electricity market. For the effective use of power system under the deregulated environment, it is important to make a fast and accurate calculation of the maximum available transfer capability (ATC) from a supply point to a demand point. In this paper, the purpose of this research is to calculate ATC fast and accurately for securing the stability of system and raising the efficiency as a result of anticipating transmission congestion according to transmission open access progressed in the future under the regulated environment of electricity market. In this paper, a study utilized a relation of the potential energy and energy function by which calculated CCT and then utilized a relation of PEBS for transient stability ATC calculation. In this paper, ATC was calculated as RPF and Energy Function method and calculation results of each method was compared. Contingence ranking method decided the weak bus by the Eigenvalues of Jacobian matrix and overloading branches by PI-index. As a result, a study proved the fast and accurate ATC calculation method considering transient stability suggested in this paper. Through the case study using New England 39 bus system, it is confirmed that the proposed method can be used for real time operation and the planning of electric market.

Enhancement Power System Transfer Capability Program (PSTCP) To Calculate Total Transfer Capability in Power Systems (전력계통의 TTC(Total Transfer Capability) 산정을 위한 수송능력평가 프로그램 향상)

  • Kim, Sang-Ahm;Lee, Byung-Jun;Song, Kil-Yeong
    • Proceedings of the KIEE Conference
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    • pp.1514-1516
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    • 1999
  • This paper presents a sequential framework that calculates the total transfer capabilities of power transmission systems. The proposed algorithm enhances the Power System Transfer Capability Program (PSTCP) in conjunction with the Continuation Power Flow(CPF) that is used for steady-state voltage stability analysis and modified Arnoldi-Chebyshev method that calculates rightmost eigenvalues for small signal stability analysis. The proposed algorithm is applied to IEEE 39-bus test system to calculate TTC.

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