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항법위성에서의 데이터 전송률 증대를 위한 월시-하다마드 코드 기반 직교변조 기법
안재민(Jae Min Ahn) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.8
An orthogonal modulation scheme based on the Walsh–Hadamard code is proposed for higher-rate transmission from a navigation satellite. The proposed scheme is compared with the cyclic shift keying (CSK) modulation adopted in the L-band experimental (LEX) signal of the Japanese Quasi-Zenith Satellite System (QZSS) in terms of demodulation performance and receiver implementation complexity. Analysis of the implementation complexity and simulation results on the symbol error rate performance show that the proposed scheme outperforms the CSK modulation of the LEX signal.
PSCAD/EMTDC를 이용한 저전압 직류 배전 시스템의 단락 고장 전류 분석
안재민(Jae-Min Ahn),전정채(Jeong-Chay Jeon),임용배(Young-Bae Lim),배석명(Seok-Myeong Bae),변길성(Gil-Sung Byeon),이경호(Kyoung-Ho Lee) 대한전기학회 2010 전기학회논문지 P Vol.59 No.4
In this paper, we analyzed the short circuit current of a low voltage direct current distribution system. For the analysis, we performed the modeling of the low voltage direct current distribution system with a 6-pulse three-phase thyristor rectifier using the PSCAD/EMTDC, surveyed impedance of sources, transformers and distribution lines to run a simulation. A result of the simulation is that short circuit currents of the direct current distribution system with the rectifier decreased due to a thyristor-ON-resistance(Ron). But in case of the low thyristor-ON resistance, output fault current of the rectifier increased over three-phase short circuit current of an AC power system without a rectifier by regular ratio of the rectifier. Because the output fault current of the rectifier can increase over interrupting the capacity of circuit breakers, studying short circuit currents of a low voltage direct current distribution system with a rectifier is necessary for introducing the direct current distribution systems.
IEC 61660-1기반 직류배전시스템의 단락전류 검토
안재민(Jae-Min Ahn),김기현(Ki-Hyun Kim),전정채(Jeong-Chay Jeon),임용배(Young-Bae Lim),배석명(Seok-Myeong Bae),이경호(Kyoung-Ho Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
We investigated a short-circuit current for DC distribution system based on the IEC 61660-1. Short-circuit currents of DC distribution system are addition of four partial short-circuit currents which are rectifiers in three-phase AC bridge connection, stationary batteries, smoothing capacitors, DC motors. Each of four partial short-circuit current be calculated by standard approximation function.
안재민(Jae-Min AHN),한운기(Woon-Ki Han),유재근(Jae-Geun Yoo),배석명(Suk-Myeong Bae),김재철(Jae-chul Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
가정용 분산전원 연계시 누전차단기 설치에 대해 분석하였다. 가정용 분산전원 연계시 양방향의 조류로 인해 누전차단기 설치시 역접속의 우려가 있으며 분산전원 측을 l차 측으로 판단하여 설치하는 경우가 발생하고 있다. 이러한 문제는 기준이 마련되지 않은 국내 환경의 영향으로 개선되어야 할 것으로 사료된다. 일본의 산업 규격인 JIS 3588에서는 분산전원용 누전차단기 설치를 규정하고 있으며 양방향성 누전차단기를 권장하고 있다. 이러한 기준은 국내에도 도입할 필요가 있다.
安宰民(Jae-Min Ahn),金辰碩(Jin-Seok Kim),文鍾必(Jong-Fil Moon),林成勳(Sung-Hun Lim),金載哲(Jae-Chul Kim),金喆煥(Chul-Hwan Kim),玄鈺培(Ok-Bae Hyun) 대한전기학회 2008 전기학회논문지 Vol.57 No.5
The increase of fault current due to larger power demand has caused the capacity of power machines in grid to increase. To protect the power system effectively from the larger fault current, several countermeasures have been proposed. Among them, the superconducting fault current limiter (SFCL) has been expected as one of the most effective solutions. Therefore, to introduce SFCL into power distribution system, the analysis on protection in power distribution system with SFCL is essential. In this paper, the problems of the protective coordination in power distribution system with SFCL were described.
급성 경항통 환자의 흉쇄유돌근에 대한 근 에너지 기법(MET) 시술 후의 경근전도 변화 연구
안재민 ( Jae Min Ahn ),조동인 ( Dong In Cho ),박동수 ( Dong Su Park ),정수현 ( Su Hyeon Jeong ),김순중 ( Soon Joong Kim ) 한방재활의학과학회 2014 한방재활의학과학회지 Vol.24 No.1
ObjectivesTo evaluate the clinical utility of MET performed on sternocleidomastoid mus-cle of acute nuchal pain patients, we measured a change of meridian electromyography.MethodsWe compared electrical activity before and after MET performed on sternoclei-domastoid muscle of acute nuchal pain patients in same group (n=20) in isometric exercise state during five seconds. We analyzed amplitudes and areas of electrical activity and asymmetry index (AI).Results1. After MET performed on sternocleidomastoid muscle of acute nuchal pain pa-tients, maximum voluntary isomeric contraction (MVIC) was significantly increased more than before MET performed (p<0.005). 2. Comparing with before MET performed on ster-nocleidomastoid muscle of acute nuchal pain patients, muscle fatigue after MET performed on sternocleidomastoid muscle of acute nuchal pain patients decreased but there was no significant difference. 3. Comparing with before MET performed on sternocleidomastoid muscle of acute nuchal pain patients, asymmetry index (AI) after MET performed on sterno-cleidomastoid muscle of acute nuchal pain patients decreased but there was no significant difference.ConclusionsAccording to above results, after performing MET on sternocleidomastoid muscle of acute nuchal pain patients, maximum voluntary isomeric contraction (MVIC) in-creased significantly, so it is certain that performing MET on sternocleidomastoid muscle has a clinical effect. (J Korean Med Rehab 2014;24(1):93-100)
PSCAD/EMTDC를 이용한 저전압 직류배전 시스템 모델링
안재민(Jae-Min Ahn),전정채(Jeong-Chay Jeon),임용배(Young-Bae Lim),배석명(Seok-Myeong Bae),이경호(Kyoung-Ho Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
The purpose of this paper is to analyze electrical safety of a low voltage direct current distribution system with 6-pulse three-phase thyristor rectifier. For analysing electrical safety. we performed modeling of the low voltage direct current distribution system with a 6-pulse three-phase thyristor rectifier using PSCAD/EMTDC and surveyed impedance of sources. transformers and distribution lines to run a simulation. In this paper, we verified the modeling of the low voltage direct current distribution system with a 6-pulse three-phase thyristor rectifier which is controlled PSCAD's PI controller, PLL, and a Interpolated Firing Pulse.
계층다상부호 기반 위성항법 측위신호의 서비스 멀티플렉싱 기법
안재민(Jae Min Ahn),한상권(Sang Kwon Han),김갑진(Kap-Jin Kim),송기원(Ki-Won Song) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.6
A new service multiplexing technique for ranging signals of satellite navigation systems based on the tiered polyphase code family is proposed. Two different services are spread by their spreading code and multiplexed into in-phase and quadrature components. The multiplexed signal is masked by the secondary code, which has a complex value to achieve additional processing gain and interference reduction. The envelope variation of the ranging signal generated by the proposed technique can be maintained at a constant level even with the polyphase mask code. The analysis of the envelop variation shows that the proposed multiplexing technique outperforms code-based service multiplexing in terms of peak-to-average power ratio. The simulation results on the symbol error rate performances of the multiplexed services show that the multiplexed services do not interfere with each other with appropriate receiver operations.