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김창규 진주산업대학교 1977 論文集 Vol.15 No.-
현재 우리들이 사용하고 있는 TV 방송에서 VHF Channel은 80정도 밖게 만들지 못하지만 SHF 전파는 VHF에 比하여 많은 Channel을 만들 수 있고 화면의 확대 및 미세한 부분까지 똑똑히 볼 수 있으며 SHF 전파는 단점보다 장점이 많은 전파이다, 즉 태양빛의 傳播와 비슷한 성질을 가지고 있으므로 앞으로 복잡한 전파상태에서 좋은 화면을 볼 수 있으려면 비용이 VHF보다 약간 많이 소요하여도 SHF전파로 방송하여야 하며 가장 전파가 복잡한 상태에서 알맞은 전파이다. In the T.V. broadcasting which we are using now, we cann't make the channel of V.H.F. electric current only 80, but we can make the channel of S.H.F. electric current two times larger than that of V.H.F electric current, and we can see the magnification of screen and the minute part copletely, S.H.F. electric current hae march perfection than V.H.F electric current, I oher words, it has such charactor as sun-light, and if we use S.H.F of the short wave length in the state of camplicated air electric current, we can broadcast the fetler screen.
Estimation of Solution Accuracy From Leadfield Matrix in Magnetoencephalography
Chany Lee,Chang-Hwan Im,Kyung Choi,Hyun-Kyo Jung IEEE 2007 IEEE transactions on magnetics Vol.43 No.4
<P>This paper is a report of an investigation of the relationship between the condition number of a leadfield matrix of magnetoencephalography and source reconstruction accuracy. We suggest the use of the condition number as a promising a priori accuracy estimator of a neuromagnetic inverse problem (NIP) since various simulation studies demonstrated that the reconstructed source distribution has the wider region and contains more spurious sources if a leadfield matrix has the higher condition number. The simulation results also verified that the accuracy estimator based upon the condition number can explain well-known phenomena of NIP, which suggests a potential application of the proposed concept</P>
Analysis of a Gas Circuit Breaker Using the Fast Moving Least Square Reproducing Kernel Method
Chany Lee,Do Wan Kim,Sang-Hun Park,Hong-Kyu Kim,Hyun-Kyo Jung 대한전기학회 2009 Journal of Electrical Engineering & Technology Vol.4 No.2
In this paper, the arc region of a gas circuit breaker (GCB) is analyzed using the fast moving least square reproducing kernel method (FMLSRKM) which can simultaneously calculate an approximated solution and its derivatives. For this problem, an axisymmetric and inhomogeneous formulation of the FMLSRKM is used and applied. The field distribution obtained by the FMLSRKM is compared to that of the finite element method. Then, a whole breaking period of a GCB is simulated, including analysis of the arc gas flow by finite volume fluid in the cell, and the electric field of the arc region using the FMLSRKM.
Analysis and Design of Whole-Head Magnetic Brain Stimulators: A Simulation Study
Chany Lee,Chang-Hwan Im,Hyun-Kyo Jung 대한전기학회 2007 International Journal of Control, Automation, and Vol.5 No.3
This paper proposes a helmet-type whole-head brain stimulator system considering a realistic head geometry. For more accurate design and computer simulations, a realistic volume conductor model was adopted and the current evoked on human cerebral cortex was analyzed using the boundary element method (BEM). To obtain a more focalized evoked current around the target points, various coil configurations were tested and an average targeting error of about 10㎜ was obtained.
이찬희(Chany Lee),우동균(Dong-Kyun Woo),정현교(Hyun-Kyo Jung) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
이 논문에서는, 편미분 방정식을 풀기위한 수치해석 기법들 가운데, 유한요소법과 달리 요소를 사용하지 않는 방법인 무요소법 중의 하나인 FMLSRKM을 소개하고자한다. 이 방법의 근사화 과정과 정전계 해석, 축대칭, 비균일매질에의 적용을 보임으로써 FMLSRKM이 훌륭한 근사해를 만들어낸다는 것을 검증하였다.
Lee, Chany,Kim, Euijin,Im, Chang-Hwan IEEE 2018 IEEE transactions on magnetics Vol.54 No.5
<P>Enhancement of computational efficiency is highly critical for finite-element analysis of electric fields generated by transcranial direct-current stimulation (tDCS) in order to foster field-analysis-based customized brain stimulation in practical scenarios. In this communication, we applied domain decomposition method (DDM) and adaptive mesh refinement method to the analysis of tDCS. DDM is likely to be particularly useful for tDCS field analysis problems with extracephalic reference electrodes. Our simulation results demonstrated that the DDM adopting the Schur complement method could reduce the overall computational time by 15% compared to the conventional single-domain analysis. On the other hand, to verify the enhancement of computational efficiency by adaptive mesh refinement, we used a realistic human head model with two sponge electrodes attached on the scalp surface. The distribution of numerical error estimated using an a posteriori error estimation method demonstrated that high errors were mostly concentrated on the edges and corners of the sponge electrodes. The overall solution accuracy could be remarkably enhanced by adding about 250 nodes around the high-error regions.</P>
Analysis of a Gas Circuit Breaker Using the Fast Moving Least Square Reproducing Kernel Method
Lee, Chany,Kim, Do-Wan,Park, Sang-Hun,Kim, Hong-Kyu,Jung, Hyun-Kyo The Korean Institute of Electrical Engineers 2009 Journal of Electrical Engineering & Technology Vol.4 No.2
In this paper, the arc region of a gas circuit breaker (GCB) is analyzed using the fast moving least square reproducing kernel method (FMLSRKM) which can simultaneously calculate an approximated solution and its derivatives. For this problem, an axisymmetric and inhomogeneous formulation of the FMLSRKM is used and applied. The field distribution obtained by the FMLSRKM is compared to that of the finite element method. Then, a whole breaking period of a GCB is simulated, including analysis of the arc gas flow by finite volume fluid in the cell, and the electric field of the arc region using the FMLSRKM.
Chang-Hwan Im,Chany Lee,Hyun-Kyo Jung,Soo Yeol Lee IEEE 2008 IEEE transactions on magnetics Vol.44 No.6
<P>The present study proposes a new neuronal electrical source model to simulate electroencephalography (EEG) forward signals more effectively. Contrary to the conventional methods which used a presumed activation function at cortical patches or point dipolar sources, the proposed model reflects electrophysiological facts and introduces probability concept, resulting in more plausible and readily controllable artificial EEG waveforms.</P>