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남은수,이충권,최윤성 (사)한국스마트미디어학회 2022 스마트미디어저널 Vol.11 No.11
Identifying defects in textiles is a key procedure for quality control. This study attempted to create a model that detects defects by analyzing the images of the fabrics. The models used in the study were deep learning-based VGGNet and ResNet, and the defect detection performance of the two models was compared and evaluated. The accuracy of the VGGNet and the ResNet model was 0.859 and 0.893, respectively, which showed the higher accuracy of the ResNet. In addition, the region of attention of the model was derived by using the Grad-CAM algorithm, an eXplainable Artificial Intelligence (XAI) technique, to find out the location of the region that the deep learning model recognized as a defect in the fabric image. As a result, it was confirmed that the region recognized by the deep learning model as a defect in the fabric was actually defective even with the naked eyes. The results of this study are expected to reduce the time and cost incurred in the fabric production process by utilizing deep learning-based artificial intelligence in the defect detection of the textile industry. 섬유산업에서 생산된 직물의 결함을 식별하는 것은 품질관리를 위한 핵심적인 절차이다. 본 연구는 직물의 이미지를 분석하여 결함을 검출하는 모델을 만들고자 하였다. 연구에 사용된 모델은 딥러닝 기반의 VGGNet과 ResNet이었고, 두 모델의 결함 검출 성능을 비교하여 평가하였다. 정확도는 VGGNet 모델이 0.859, ResNet 모델이 0.893으로 ResNet 모델의 정확도가 더 높은 결과를 보여주었다. 추가적으로 딥러닝 모델이 직물의 이미지 내에서 결함으로 인식한 부분의 위치를 알아보기 위하여 XAI(eXplainable Artificial Intelligence)기법인 Grad-CAM 알고리즘을 사용하여 모델의 관심영역을 도출하였다. 그 결과 딥러닝 모델이 직물의 결함으로 인식한 부분이 육안으로도 실제 결함이 있는 것으로 확인되었다. 본 연구의 결과는 직물의 결함 검출에 있어서 딥러닝 기반의 인공지능을 활용함으로써 섬유의 생산과정에서 발생하는 시간과 비용을 줄일 수 있을 것으로 기대된다.
Mixed-Domain Adaptive Blind Correction of High-Resolution Time-Interleaved ADCs
서문교,남은수,Mark Rodwell 한국전자통신연구원 2014 ETRI Journal Vol.36 No.6
Blind mismatch correction of time-interleaved analogto-digital converters (TI-ADC) is a challenging task. Wepresent a practical blind calibration technique for lowcomputation,low-complexity, and high-resolutionapplications. Its key features are: dramatically reducedcomputation; simple hardware; guaranteed parameterconvergence with an arbitrary number of TI-ADCchannels and most real-life input signals, with nobandwidth limitation; multiple Nyquist zone operation;and mixed-domain error correction. The proposedtechnique is experimentally verified by an M = 4 400MSPS TI-ADC system. In a single-tone test, the proposedpractical blind calibration technique suppressed mismatchspurs by 70 dB to 90 dB below the signal tone across thefirst two Nyquist zones (10 MHz to 390 MHz). A widebandsignal test also confirms the proposed technique.
GaAs와 InP에 격자정합된 GaINAsP 이중조직에서 불순물 확산에 의한 상호확산 촉진
박효훈,이경호,남은수,이용탁,Park, Hyo-Hun,Lee, Gyeong-Ho,Nam, Eun-Su,Lee, Yong-Tak 한국전자통신연구원 1989 전자통신 Vol.11 No.4
The influence of Zn, Si and Te diffusion on the interdiffusion in $GaAs-Ga_1_-xIN_xAs_1__yP_y$and InP$Ga_1__xIn_xAs_1__yP_y$ heterostructures was studied. The heterostructures were grown by liquid phase epitaxy, and the impurity diffusion into the heterostructures was carried out using metal compound or element sources. The extent of interdiffusion for both group III and V atoms was observed by depth profiling of matrix elements with secondary ion mass spectrometry and Auger electron spectroscopy. Selective enhancement of cation interdiffusion was observed by the concurrent Zn diffusion in both the GaAs based-and InP based-crystals. In contrast to the Zn diffusion, the Si diffusion in the GaAs based-crystal and the Te diffusion in the InP based-crystal enhanced both cation and anion interdiffusion to the same extent. A kick-out mechanism is proposed to explain the selective enhancement of the cation interdiffusion due to Zn, and a single vacancy mechanism is proposed for the interdiffusion due to Si and Te.
A Narrow Bandwidth Microstrip Band-Pass Filter with Symmetrical Frequency Characteristics
전동석,김동영,남은수,Hong Yeol Lee,Sang Seak Lee 한국전자통신연구원 2005 ETRI Journal Vol.27 No.5
This letter proposes a band-pass filter (BPF) with two transmission zeros based on a combination of parallel coupling and end coupling of half-wave transmission lines. The fabricated BPF exhibited a narrow bandwidth and two transmission zeros near the pass-band due to the end-coupled and shielding waveguide. At the center operation frequency of 60 GHz, the 20 dB bandwidth of the BPF is 1.0 GHz, which is almost 2% of the center operation frequency, and the insertion loss is 3.12 dB. Two transmission zeros reach approximately 40 dB at 58.5 and 62.5 GHz. The simulation results almost agree with the measured results.