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유상길(Sang-Gil Yu),최순우(Swoon-Woo Choi),김동현(Dong-Hyun Kim),김대오(Dae-Oh, Kim),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.5
This paper presents precise measurement techniques for waveguide components at microwave band. The error parameters are presented in the network analyzer and the calibrated results are shown by using the SOLT(Short-Offset short-Load-Thru) kit when measuring waveguide components. A method is proposed to obtain the performances of the circular-rectangular waveguide transition by in order connecting 3 offset shorts. The scattering parameters of the transition are calculated from the measured reflection coefficients with 3 offset shorts. The waveguide transition has a reflection coefficient of less than -18dB and a transmission coefficient of more than –0.16dB. Next, a method utilizing a low-reflection horn at the common port of an OMT is introduced. The electric performances between the straight and side ports are measured by employing connecting a low-reflection horn at the common port of the OMT. The measurements agree well with the designed results.
유상길(Sang-Gil Yu),박철수(Cheol-Su Park),최순우(Swoon-Woo Choi),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.10
This paper proposes a Ka-band monopulse feed horn having four input rectangular waveguides. The proposed feed consists of four input waveguides, two H-moders, a E-moder and a flared horn. Two H-moders and the E-mode having waveguide discontinuous structures are designed by using the DFT function in the commercial software. The lengths of each moder and the flared horn are determined to satisfy in-phase conditions of the multi modes at the feeds aperture. Five-step waveguide transformers are designed and employed to connect the input waveguide of the feed to the WR-28 rectangular waveguide. The optimally designed monopulse feed is fabricated with 3 split blocks. The fabricated horn has a reflection coefficient of less then -10dB over 34.55-36.56GHz and a -15dB beamwidth of 100°. In the difference patterns over the azimuth and elevation planes, the null is less than -22dB at the center of the feed.
검출 성능 향상 및 불확실성 추정을 위한 다목적 객체 검출 알고리즘
길호평(Hopyong Gil),정준영(Juneyoung Jung),박상우(Sangwoo Park),박유상(Yousang Park) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
In autonomous driving systems, it is important to understand its surrounding environment while managing uncertainty. Accordingly, the recent object detector used in automotive application has been greatly improved with the growth of DNN (Deep Neural Network). In this paper, we propose Multi-Task object detector to improve performance and estimate uncertainty of the detector. 1) We develop Center Estimation Module that contains Center Estimation Branch and Center Feature Extractor. This can help the model assign a proper anchor on objects as positive by fusing RPN (Region Proposal Network) feature with a center feature. 2) We show Baseline with lower performance can also be used as a teacher model for knowledge distillation with feature imitation. This not only takes an advantage in early learning, but also improve the final performance. 3) We propose the method to visualize an uncertainty of the prediction in the image at pixel level by combining BBox (Bounding Box) and center disk estimation result. Finally, our proposed model has improved performance of +1.4% AP (Average Precision) on the MS-COCO dataset and we show it is possible to visualize the risk we may encounter while driving with the model.
연속 공정 PVD 방법에 의한 Coated Conductor 제조
고락길,정준기,김호섭,하홍수,송규정,박찬,유상임,문승현,김영철,Ko, Rock-Kil,Chung, Jun-Ki,Kim, Ho-Sup,Ha, Hong-Soo,Shi, Dongqi,Song, Kyu-Jeong,Park, Chan,Yoo, Sang-Im,Moon, Seung-Hyun,Kim, Young-Cheol 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.11
Continuous physical vapor deposition (PVD) method is one of many processes to fabricate long length coated conductor which is required for successful large-scale application of superconducting power devices. Three film deposition systems (pulsed laser deposition, sputtering, and evaporation) equipped with reel-to-reel(R2R) metal tape moving apparatus were installed and used to deposit multi-layer oxide thin films. Both RABiTS and IBAD texture templates are used. IBAD template consists of CeO$_2$(PLD)/YSZ(IBAD) on stainless steel(SS) metal tape, and RABiTS template has the structure of CeO$_2$/YSZ/Y$_2$O$_3$ which was continuously deposited on Ni-alloy tape using R$_2$R evaporation and DC reactive sputtering in a deposition system designed to do both processes. 0.4 m-long coated conductor with Ic(77 K) of 34 A/cm was fabricated using RABiTS template. 0.5 m and 1.1 m-long coated conductor with Ic(77 K) of 41 A/cm and 26 A/cm were fabricated using IBAD template.