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윤종학,안병운,박성준 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.3
In micro hole punching process the burr occurs inevitably, but the burr must be minimized in order to improve the quality 1 and accuracy of the product. In this study, magnetic field-assisted polishing technique is applied to remove the burr which exists in nozzles for ink-jet printer head and proved to be a feasible for deburring by experiment. The deburring characterisics of sheet metals was investigated changing with polishing time and magnetic abrasive size. After the deburring, the burr size has remarkably reduced and roundness of the hole also has improved.
국가직무능력표준(NCS) 기반 인쇄분야 국가기술자격 설계 방안
윤종학,김재해,소기호,박계영 한국인쇄학회 2017 한국인쇄학회지 Vol.32 No.1
This study is briefed the national competency standards(NCS) which developed through occupational map analysis in printing fields and the national technical qualifications which were Engineer Printing, Industrial Engineer Printing and Craftsman Printing. And the question for skill test of printing fields was developed by comparing NCS and guideline for question-making. Finally the new system of technical qualification based on printing NCS was designed.
윤종학,여만구,김상헌 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.3
This study is focused on the prediction of appropriate tool life by clarifying the correlation between progressive tool wear and AE(Acoustic Emission) signals, while cutting stainless steel by end mill on te machining center. The results of this study were that RMSAE tends to increase linearly along with the incrase of the cutting speed, and it was more sensitive to depth of cut than to the variation of feed rate at the same cutting conditions, and RMSAE increases around 0.21mm flank wear hereby AE-HIT also increases. AE signals depend upon tool wear and fracture from the above results. Therefore, the AE signals can be utilized in order to monitor the tool condition.
工具壽命을 判定하기 위한 Acoustic Emission(AE) 검출방법의 활용성 연구
윤종학 서울産業大學校 1987 논문집 Vol.26 No.1
Acoustic Emission (AE) is ued to detect the cutting tool failure in the automated machining system, and to detect the micro-scopic processes of the material deformation and failure during the up-set forging. AS the result, we got the following conclusions; 1. It was observed that amplitude level of AE signal was affected by cutting velocity only, and amplitude level of AE signal was directly proportional to flank wear width and the increasing rate was velated to cutting velocity. So, the relation between amplitude level of AE signal and tool life was represented as follow, ?? where, n=0.35, ?? 2.?? is not much affected by feed rate, but drop 10-15% of it's value by lubricating. 3. Also in the plastic deformation on the same forming ratio, the plastic tensile instability point was reached more rapidly on the lubricated condition than non-lubricated and was appeared rapid increase of AE generation by crack and breakage.
윤종학,이호영,이종원 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.2
This study was focused on the prediction of the appropriate tool life by clarifying the correlation between progressive drill wear and AE signal, on drilling SM45C. the following results have been obtained : RMS_AE , AE CUM-HITS and CUM-CNTS had a tendency to increase slowly according to wear size, at 1000rpm, 150mm/min. However, these increased suddenly in the range of 0.20~0.22mm wear, about 102 holes and had a tendency to go up and down until the drilling was impossible. The sudden increase of AE signal shows that something is wrong and it is closely connected with drill wear and chipping. It also makes the working surface bad. From the above results, AE signal could be sued to monitor the drill's condition and to determine the right time to change tools.
윤종학,정문섭,이헌철 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3
High speed machining aims to raise the productivity and efficiency by making more precise and higher value-added products than any other machining method by means of the high speediness of spindle and feed drive system. The purpose of this study is to investigate the effects of the run-out of endmill on the dimension precision of workpiece and to obtain the fundamental data on high speed machining, which is available by machining the side of Al-alloy with solid carbide endmills in high speed machining center and by measuring dimensions and surface roughness. From the results of experimentations followings are obtained ; if spindle speed is ultrahigh in conditions that radial depth of cut and feed per tooth are very small, highly precise and accurate products are to be made efficiently with high feed rate, and so we can raise productivity.
윤종학,고재필,최경주 한국멀티미디어학회 2023 멀티미디어학회논문지 Vol.26 No.3
In this paper, we proposed a novel brain tumor segmentation model based on U²-Net structures developed to solve information dilution problems that may arise as the network of U-Net deepens. The proposed model allows us to capture more contextual information than models such as U-Net on various scales, and increases the depth of the overall architecture without significantly increasing the computational cost due to pooling operations used inside the RSU block. To analyze the performance of the proposed model, we trained and tested using the BraTS2020 dataset, and we experimentally confirmed that our proposed model performs better than the existing model even with a small number of feature maps channels.