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CPW-fed to CPS 전이 급전에 의한 이중 테이퍼드 발룬을 포함한 평판형 Yagi-Uda 다이폴 안테나 설계
이현진(Hyeonjin Lee),김태홍(Tea-Hong Kim) 대한전기학회 2015 전기학회논문지 P Vol.64 No.4
In this paper, we proposed a broadband planar Yagi-Uda dipole antenna with dual tapered balance and unblance (balun) by CPW-fed to CPS. This antenna consisted of driver, three directors, dual tapered balun and CPS-fed to CPS. The fed structure of CPW-fed to CPS had a benefit points much simpler than other planar Yagi-Uda antennas and provided design more flexibility in arranging the reflector. The proposed antenna is introduced dual tapered balun to improve the impedance matching. It balun is inserted between the CPW-ground and the CPS. The proposed antenna s exhibited the bandwidth of 4.78 GHz (1.94~6.72 GHz) (S11 < -10 dB) and the gain of 4.9~7.2 dBi within that bandwidth. This antenna will applicate wireless communication.
이현진(Hyeonjin Lee),최태일(Tea-Il Choi) 대한전기학회 2012 전기학회논문지 P Vol.61 No.1
In this paper, multi folded dual monopole antenna for WLAN communication of dual bend is designed and fabricated. The proposed multi folded dual monopole antenna are consisted of two folded rectangle loops by microstrip fed that is modified dual monopole antenna. Therefore, the outside rectangle loop structure of the proposed antenna is extended a dual monopole. The characteristics of the proposed antenna is analyzed return loss and radiation patterns by the FDTD tools. As a result a bandwidth of proposed antenna has about 0.82GHz from 2.0 to 2.82[GHz] and 0.7GHz from 5.46 to 6.16[GHz]. It is used WLAN communications of 2[GHz] and 5[GHz].
이현진(Hyeonjin Lee) 대한전기학회 2012 전기학회논문지 P Vol.61 No.1
In this paper, the planar type modified folded loop antennas for S-DMB band is proposed. The proposed antenna consisted of opened center of a conventional closed loop and folded terminal of microstrip line to inside loop antenna. The sizes proposed antenna was minimized by folding the terminal of the loop. Also, It was minimized reactance value by increasing capacitances between coupled microstrip line. Therefore the proposed antennas compacted about 20% than a conventional loop antenna and increased efficiency of antenna. The proposed antennas got an omni-directional pattern, the antenna gain was 3.67 [dBi] and the bandwidth was 900 MHz (2.6-3.56 GHz) with VSWR≤2 from the simulated and the measured results. The frequency utilization coefficient was 29.9 %. These properties could satisfy the S-DMB band.
실시간 음역 추출을 통한 음악 추천 알고리즘 구현 및 평가
이현진(HyeonJin Lee),김민규(MinGyu Kim),박민지(MinJi Park),조재림(JaeRim Jo),배지훈(Ji-Hoon Bae),이종혁(JongHyuk Lee) 한국정보기술학회 2024 Proceedings of KIIT Conference Vol.2024 No.5
한류 음악의 열풍으로 인해 노래방 이용자들이 증가하고 있지만 음 이탈에 대한 두려움을 겪는 이용자들 또한 증가하고 있다. 본 논문에서는 이러한 이용자들을 위해 음원 분리 기술과 실시간 음역 추출을 활용한 음악 추천 알고리즘을 제안한다. 사용자의 음성 데이터를 분석하여 해당 사용자의 음역을 파악하고, YIN 알고리즘과 코사인 유사도를 활용하여 음역에 맞는 음악을 추천한다. 실험 결과는 YIN 알고리즘이 실시간 사용자 음역 추출에 효과적임을 보여주며, 이를 통해 사용자는 자신에게 맞는 음악을 쉽게 찾고 즐길 수 있다. 이러한 알고리즘은 음악을 통한 즐거움을 확장하고 사람들 간의 소통과 연결을 촉진할 것으로 기대된다. The rising popularity of Hallyu music has led to an increase in karaoke users. However, many users experience pitch deviation fear, which hinders their enjoyment of singing. To address this issue, this study proposes a music recommendation algorithm that utilizes music source separation technology and real-time pitch tracking. The algorithm analyzes user voice data to identify their vocal range and recommends music that matches their range using the YIN algorithm and cosine similarity. Experimental results demonstrate the effectiveness of the YIN algorithm for real-time pitch tracking and the positive impact of the proposed algorithm on user satisfaction. This algorithm is expected to expand musical enjoyment and facilitate communication and connection among people.
테이퍼드 발룬을 포함한 계단형의 다이폴 안테나 설계 및 구현
이현진(Hyeonjin Lee),김태홍(Tea-Hong Kim) 대한전기학회 2015 전기학회논문지 P Vol.64 No.3
In this paper, a step type driver dipole antenna with a tapered balance and unbalance (balun) by a coplanar waveguide (CPW) to coplanar strip (CPS) transition is proposed. The proposed antenna consisted of step type driver, a CPW to CPS transition and tapered balun. The proposed antenna is realized the multi and wide resonate frequency band to introduce the step type driver and tapered balun. The step type driver is acted as a director too. This antenna could be more easily designed than the conventional printed quasi-Yagi dipole antenna. The operating frequency bandwidth was 650 [MHz] (2.65~3.3 GHz), 900 [MHz] (4.7~5.6 GHz) under a return-loss criterion of less than 10 dB. The measurements of the proposed antenna exhibited good results in the wideband operating frequency and radiation pattern. The proposed antenna can support wireless communications applications.