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EM Simulator를 이용한 Microstrip Interdigital Bandpass Filter 설계
엄기환,양승인 崇實大學校 2000 論文集 Vol.30 No.1
This paper presents how to design an Interdigital Bandpass Filter that often can be used in microwave band. This filter, made of a substrate(alumina) with □□ =9.8, h=1.27㎜, and t=0.035㎜, has a 400MHz bandwidth centered at 2GHz and 0.2dB ripple. The Interdigital Bandpass Filter is analyzed using the full-wave electromagnetic solver EM Sight in Applied Wave Research's Microwave Office 2000. The concept of tapping is applied to the filter's end section for the small size.
신경회로망에 웨이브렛 함수를 이용한 새로운 지능제어방식
이용구,이승형,이현관,엄기환 동국대학교 대학원 1997 大學院硏究論集-東國大學校 大學院 Vol.27 No.-
In this paper, we propose the hybrid system identification model and control method using neural networks. Proposed control method performs, for a nonlinear plant with unknown functions, system identification using an adaptive wavelet in a neural network, and then a nonlinear controller is designed with those identified informations. To identify a nonlinear function, which is not directly related to input signals, we can use an adaptive wavelet in three-layed neural network. In order to verify the usefulness of the proposed method, we simulate the proposed control method with cart pole system.
김재홍,윤기범,박평원,김영진,전경민,김영태,김중환,곽호,구상완,송민석,유옥,지혜구,김동원,문상은,박영립,정승호,성범진,성순제,엄주용,황정열,이기홍,이주협,전태진 대한화학요법학회 1994 대한화학요법학회지 Vol.12 No.1
The prevalence of PPNG among pretreated gonorrhea cases isolated at the STD clinic of Choong-Ku Public Health Center in Seoul has been studied and reported annually since 1981. In 1991, 123 strains of N.gonorrhoeae were isolated, among which 58(47.1%) were PPNG. In 1992, 98 starains of N.gonorrhoeae were isolated, among which 51(52.0%) were PPNG. In all, 109(49.3%) strains were found to be PPNG among 221 strains isolated between 1991-1992. The prevalence of PPNG in Seoul showed increased tendency till 1989, thereafter, it has been stationary or slightly decreasing.
엄태환(Tae-Hwan Eom),차현준(Hyeon-Jun Cha),강승환(Seung-Hwan Kang),김태형(Tae-Hyung Kim),김종현(JongHyeon Kim),정기현(Ki-Hyun Jung) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.11
In this paper, a new score management system using blockchain is proposed to prevent score manipulation and ensure integrity. The proposed system is developed by android decentralized application that works on hyperledger fabric network, which can record scores through consensus and prevent manipulation and forgery by ensuring security and transparency.
Eom, Dae-Young,Hong, Seong-Rok,Kim, Chang-Hwan,Roh, Seung-Jin,Kong, Jong-Dae,Park, Kap-Rai Institute of Electrical and Electronics Engineers 2017 IEEE transactions on plasma science Vol. No.
<P>When the poloidal field (PF) magnet power supplies (MPSs) of 11 units are operated, maximum power of 200 MVA is required to achieve long pulse operation of Korea superconducting tokamak advanced research (KSTAR). Motor generator (MG) system was installed to resolve the power shortage because the available grid power is only 100 MVA at the National Fusion Research Institute site. MG system is composed of mechanical devices (stator, rotor, bearings, etc.), power control devices (variable voltage variable frequency and exciter), power facilities (transformers, switchboard, uninterruptible power system, filter, dynamic brake, etc.), utilities (cooling water pump, heat exchangers, cooling fans, oil circulation pump, mechanical brake, etc.), and control systems. MG system supplies power to the PF MPS of 11 units. And we configure the reactive power compensator (RPC) and harmonic filter (HF) system to stabilize the MG power system. After installing the MG system, individual tests and dummy coil tests were conducted to determine the safety and performance of MG system. And we completed the commissioning of the MG system by carrying out the superconducting magnet coil load tests for the 2014 KSTAR experiment. MG system was operated up to 150 MVA of PF MPS with the RPC and HF system. And the maximum operating duration was about 100 s. In this paper, we discuss about the power characteristic results of the MG system according to the superconducting magnet coil load tests.</P>