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3D Printing Monitoring System Based on Supervised Machine Learning
송호종,김태성,정구상,전진웅 사단법인 한국융합기술연구학회 2023 아시아태평양융합연구교류논문지 Vol.9 No.3
One of the additive manufacturing processes that is quickly evolving is metal 3D printing. Selective laser melting (SLM) is one of the popular methods for metal 3D printing. Although it has many advantages and capabilities, there are still unsolved problems like process monitoring and printing reliability. Printing high-quality robust products require appropriate parameter settings and real-time monitoring. In order to satisfy the requirement, we propose a new monitoring system based on multiple sensors that can measure the index of different quality affecting parameters of SLM 3D printing. The system serves to improve printing quality; it involves supervised machine learning to predict the expected tensile strength of the printed product. We trained the machine learning model on our new “tensile strength” dataset which includes multiple sensing data and indexes of tensile strength. While collecting data we printed products that have a tensile strength between 449 and 506 MPa. A number of SLM 3D printing tests are carried out to show the viability of the proposed approach. After testing the tensile strength of the printed product, test results were compared to the results of the tensile strength predicting model. According to experiments, the monitoring system showed satisfactory results predicting expected tensile strength. The highest accuracy has been achieved with Multiple Linear Regression, recording 97%. The monitoring system helps not only to predict the tensile strength of the printing product but also to find optimal parameter settings of the SLM printer.
개방형 구조의 실시간 고속 영상 압축 및 복원 시스템의 개발 및 성능 최적화
정영훈(Young Hoon Jeong),전진웅(Jin Woong Jun),홍상기(Sang Gi Hong),김재호(Jae Ho Kim) 한국화상학회 2000 한국화상학회지 Vol.6 No.1
This paper, we implemented a high-speed image processing system based on the open architecture which can compress the still image at the rate of 30 frames a second, and it can also store, transmit and decompress the data at the same rate. This system can be used for not only image compression and decompression system but also general-purpose image processing system with the extensibility and the flexibility in high speed processing. In the view of hardware, we used the excellent performance fixed point DSP TMS320C6201 and also designed an efficiency architecture which shares continuous input data into the related devices on the system. For the purpose of the various performances and the extensibilities, we used several FPGAS on this system; which are to get the variable environments and specifications - inspection system, image (do)compression system, identification system, object tracking system. In a software viewpoint, we adopt software pipelining and intrinsic techniques based on efficiency data allocation in 8 units of VLIW architecture. Finally, we verify the H/w and S/W performances by the implementation of JPEG system.
UV 처리에 의한 T-OLED용 산화전극에 적합한 Ag 박막연구: Nano-Mechanics 특성 분석을 중심으로
이규영,김수인,김주영,권구은,강용욱,손지원,전진웅,김민철,이창우,Lee, Kyu Young,Kim, Soo In,Kim, Joo Young,Kwon, Ku Eun,Kang, Yong Wook,Son, Ji Won,Jeon, Jin Woong,Kim, Min Chul,Lee, Chang Woo 한국진공학회 2012 Applied Science and Convergence Technology Vol.21 No.6
Ag (silver)의 일함수는 T-OLED (Top Emission Organic Light Emitting Diode)의 전극소자로 사용하기에는 다소 낮다는 단점이 있다(~4.3 eV). 이러한 단점을 해결하기 위한 대안으로 Ag 박막의 표면을 플라즈마, UV, 열처리를 통하여 일함수를 높이는 연구가 진행되어 왔다(~5.0 eV). 하지만 현재의 대부분 연구는 후 처리된 박막의 일함수에 초점을 맞춰 연구가 진행되어, 박막의 mechanical property에 대한 연구는 매우 부족하며 이는 T-OLED의 효율과 수명 등의 연구에 매우 중요하다. 본 논문에서는 Ag와 $AgO_x$ 박막의 mechanical property에 초점을 맞춰 분석을 실시하였다. Ag는 유리기판 위에 rf-magnetron sputter를 이용하여 100 W의 power에서 150 nm 두께로 증착되었다. 증착된 박막은 UV 램프를 이용하여 다양한 시간동안 UV 처리되었다(0~9분). 본 논문에서는 처리된 박막의 면저항을 측정하고 nano indenter, Scanning Probe Microscopy의 Atomic Force Microscopy mode를 이용하여 mechanical property를 분석하였다. 실험 결과 UV 처리 시간이 3분을 넘어가는 시편과 3분 이내의 시편은 면저항값 및 경도 값에 큰 차이가 있었다. 이러한 결과는 Ag 박막의 후처리에 따른 Ag 물질의 산화 및 결합상태에 따라 박막 내에 존재하는 stress의 영향으로 예상되어진다. The work function of Ag (silver) is too low (~4.3 eV) to be used as an electrode of T-OLED (Top Emission Organic Light Emitting Diode). To solve this weakness, researches used plasma-, UV-, or thermal treatment on Ag films in order to increase the work function (~5.0 eV). So, most of studies have focused only on the work function of various treated Ag films, but studies focusing on nanomechanical properties were very important to investigate the efficiency and life time of T-OLED etc. In this paper, we focused on the mechanical properties of the Ag and $AgO_x$ film. The Ag was deposited on a glass substrate with the thickness of 150 nm by using rf-magnetron sputter with the power was fixed at 100 W and working pressure was 3 mTorr. The deposited Ag film was UV treated by UV lamp for several minutes (0~9 min). We measured the sheet resistance and mechanical property of the deposited film. From the experimental result, there were some differences of the sheet resistance and surface hardness of Ag thin film between short time (0~3 min) and long time UV treatment. These result presumed that the induced stress was taken place by the surface oxidation after UV treatment.