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Novel Parameter Estimation Method for a Ballistic Warhead with Micromotion
Inoh Choi,Jooho Jung,Kyungtae Kim,Sanghong Park 한국전자파학회JEES 2020 Journal of Electromagnetic Engineering and Science Vol.20 No.4
This paper proposes a novel method to estimate the parameters of a ballistic warhead with micromotion. First, the independent component analysis decomposes the echo signals received from the ballistic warhead into individual signals corresponding to each scatterer. Second, the one-dimensional micro-Doppler frequency trajectories are extracted from two-dimensional joint time-frequency images of decomposed individual signals. Finally, the adaptive particle swarm optimization is used to estimate the parameters that best match the mathematical model composed of unknown parameters to the one-dimensional micro-Doppler frequency trajectories. In simulations using a conical warhead model, the parameters for a ballistic warhead with micromotion are accurately estimated.
Nanofiber Web Textile Dry Electrodes for Long-Term Biopotential Recording
Tong InOh,Sun Yoon,Tae Eui Kim,Hun Wi,Kap Jin Kim,Eung Je Woo,Sadleir, Rosalind J. IEEE 2013 IEEE transactions on biomedical circuits and syste Vol.7 No.2
<P>Electrode properties are key to the quality of measured biopotential signals. Ubiquitous health care systems require long-term monitoring of biopotential signals from normal volunteers and patients in home or hospital environments. In these settings it is appropriate to use dry textile electrode networks for monitoring purposes, rather than the gel or saline-sponge skin interfaces used with Ag/AgCl electrodes. In this study, we report performance test results of two different electrospun conductive nanofiber webs, and three metal plated fabrics. We evaluated contact impedance, step response, noise and signal fidelity performance indices for all five dry electrodes, and compared them to those of conventional Ag/AgCl electrodes. Overall, we found nanofiber web electrodes matched Ag/AgCl electrode performance more closely than metal plated fabric electrodes, with the contact resistance and capacitance of Ag plated PVDF nanofiber web electrodes being most similar to Ag/AgCl over the 10 Hz to 500 kHz frequency range. We also observed that step responses of all three metal-plated fabrics were poorer than those for nanofiber web electrodes and Ag/AgCl. Further, noise standard deviation and noise power spectral densities were generally lower in nanofiber web electrodes than metal plated fabrics; and waveform fidelity of ECG-like traces recorded from nanofiber web electrodes was higher than for metal plated fabrics. We recommend textile nanofiber web electrodes in applications where flexibility, comfort and durability are required in addition to good electrical characteristics.</P>
Transmission-Line Transformer와 Harmonic Filter를 이용한 13.56 MHz 고효율 전류 모드 D급 전력증폭기 설계
서민철(Mincheol Seo),정인오(Inoh Jung),이휘섭(Hwiseob Lee),양영구(Youngoo Yang) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.5
본 논문은 Guanella의 1:1 transmission-line transformer와 harmonic filtering 방식을 이용한 13.56 MHz 고효율 전류 모드 D급(CMCD) 전력증폭기를 제안한다. 출력 정합 네트워크에 기존의 D급 전력증폭기의 부하 네트워크를 변형하여 harmonic filtering 방식을 포함시킴으로써 낮은 2차와 3차 고조파 특성을 얻었다. 제작된 CMCD 전력증폭기는 13.56 MHz의 CW 입력 신호를 사용하여 측정하였을 때, 13.4 dB의 전력 이득을 가지며, 44.4 dBm의 출력에서 84.6 %의 높은 PAE 특성을 나타내었다. 같은 출력에서 2차 3차 고조파는 각각 ?50.3 dBc와 ?46.4 dBc를 나타냈다. This paper presents a high-efficiency current mode class-D(CMCD) power amplifier for the 13.56 MHz band using a Guanella"s 1:1 transmission-line transformer and filtering circuits at the output network. The second and third s are filtered out in the load network of the class-D amplifier. The implemented CMCD power amplifier exhibited a power gain of 13.4 dB and a high power-added efficiency(PAE) of 84.6 % at an output power of 44.4 dBm using the 13.56 MHz CW input signal. The second and third distortion levels were ?50.3 dBc and ?46.4 dBc at the same output power level, respectively.
항공사서비스요인이 고객만족 및 재이용의도에 미치는 영향
문형좌(HyungJwa Moon),전인오(InOh Jeon) 한국물류학회 2016 물류학회지 Vol.26 No.2
세계 항공 시장은 개인 삶의 질적 · 경제적 수준 향상 및 국제 교역량의 증대와 관광 산업의 발달 등으로 매년 급속히 증대되고 있다. 항공 고객의 욕구도 다양하고 고도화됨에 따라 항공업계는 고객들의 독특한 욕구와 특성에 부응하기 위하여 끊임없이 노력 하고 있다. 이에 본 연구에서는 고객의 욕구를 바탕으로 차별화된 항공사 서비스요인들을 제공하여 고객에게 만족을 주고 이에 따른 재이용의도와의 관계를 파악하여 고객서비스 전략에 유용한 방향을 제시하고자 한다. 연구방법은 선행연구 및 기존의 문헌을 통한 이론적 고찰과 국제 항공을 이용한 사람들을 대상으로 실증연구를 병행하였다. 실증분석에 의한 연구 결과를 요약하면 항공사서비스요인이 만족도 및 재이용의도에 미치는 영향을 분석하는데 있어서 예약발권서비스 6개 문항, 운송서비스 7개 문항, 기내서비스 8개 문항이 높게 적재치가 나타났다. 또한 이러한 항공사서비스요인은 고객들의 전반적인 만족과 재이용의도에 긍정 적인 영향을 미치는 것으로 나타났다. 따라서 항공사의 고객서비스를 향상시키기 위해서는 무엇보다도 항공사서비스요인들에 관 한 체계적인 관리와 전략적인 개발이 필요하다. The world aviation market has been expanded every year caused by improvement of economic level · quality of individual life, increase of the trading and development of tourist industry. Aviation companies make efforts to meet customer’s unique desires and characteristics that are changing quickly. This study aims to suggest customer service strategy which is based on the relations between satisfaction and reuse intention by providing a differentiated service quality. Method of this study is combined with theoretical basis through international airline customers with advanced research and the empirical study. The summary of this empirical analysis is like below. In the results of analyzing the effect of airline service factors on customer satisfaction and reuse intention, 6 items of reservation ticketing service, 7 items of transport service and 8 items of in-flight service were shown to have reliability. And this analysis shows these airline service factors have a positive effect on the customers’ satisfaction and reuse intention. Therefore, it is necessary to improve airlines’ systematic management and strategic development on airline service factors for better airlines’ customer service.
New Protocol at Fast Scan Mode for Sea-surface Small Target Detection
Cha, Sangbin,Park, Sanghong,Jung, Jooho,Choi, Inoh Institute of Embedded Engineering of Korea 2022 대한임베디드공학회논문지 Vol.17 No.2
In this article, we propose a new protocol at fast scan mode for a sea-surface small target detection. The conventional fast scan mode is composed of coherent intrascan integration to suppress sea clutter and non-coherent interscan integration to exclude sea spikes. The proposed method realizes the coherent interscan integration by the new Fourier relationship between carrier-frequency and initial-radial-range, which can be analytically derived by using multiple carrier frequencies at fast scan mode, leading to improved detection performance, compared to the conventional non-coherent methods. In simulations, our proposed method is verified.