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A simple method to compute a periodic solution of the poisson equation with no boundary conditions
문병수,이장수,이동영,권기춘 한국지능시스템학회 2005 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.5 No.4
We consider the Poisson equation where the functions involved are periodic including the solution function. Let be the region of interest and let be an arbitrary periodic function defined in the region such that satisfies for all . We describe a very simple method for solving the equation based on the cubic spline interpolation of ; using the requirement that each interval is a multiple of the period in the corresponding coordinates, the Laplacian operator applied to the cubic spline interpolation of can be replaced by a square matrix. The solution can then be computed simply by multiplying by the inverse of this matrix. A description on how the storage of nearly a Giga byte for nodes, equivalent to a matrix is handled by using the fuzzy rule table method and a description on how the shape preserving property of the Laplacian operator will be affected by this approximation are included.
스러그 흐름내에서의 고체입자의 열전달 특성에 관한 연구
문병수,최경빈 ( Byung Soo Moon,Kyung Bin Choi ) 충북대학교 산업과학기술연구소 1995 산업과학기술연구 논문집 Vol.9 No.2
Abstract_Roman The process of heating or cooling granular or pulverized solids is receiving increased attention in the chemical industry. In many caaes of cooling or heating granular solids it is necessary or advantageous to keep the solids physically s
MMC 기반 VSC-HVDC의 사고 위치에 따른 저항형 초전도 한류기와 암 인덕터의
문병수,최효상 대한전기학회 2024 전기학회논문지 Vol.73 No.2
High voltage direct current (HVDC) has gained prominence as a method for connecting renewable energy sources and interconnecting electric power systems between countries. Recently, the modular multilevel converter (MMC) has been developed and is undergoing construction worldwide. MMC-HVDC represents a new conversion technology that can address the issues of switching loss and harmonics. During a fault in the MMC-HVDC system, the fault current rises rapidly due to the discharging of the SM capacitor, making it difficult to interrupt with continuous AC side current feed. This phenomenon leads to the destruction of semiconductor devices. To resolve this issue, superconducting fault current limiters with fast response characteristics have been applied to the MMC. The SM capacitor discharge continues until all IGBTs are blocked. Generally, the IGBT block delay is about 3 ms. However, the response time of the Resistive SFCL (R-SFCL) is faster than 3 ms. In this study, the characteristics of R-SFCL and the arm inductor under multiple fault locations in a long cable of the MMC system are confirmed using PSCAD. The R-SFCL is modeled based on actual experimental data. As a result, as the inductor’s capacity increases, the peak current decreases, and the farther the fault location is, the faster the DC current reaches zero-point. Conversely, in the case of R-SFCL, as the resistance increases, the peak current decreases, and the closer the fault location is, the faster the DC current reaches zero-point.