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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.
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,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.
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.
기후변화에 따른 한반도 참식나무 생육지 예측과 영향 평가
윤종학,中尾勝洋,김중현,김선유,박찬호,이병윤 한국환경영향평가학회 2014 환경영향평가 Vol.23 No.2
The research was carried out in order to find climate factors which determine the distributionof Neolitsea sericea, and the potential habitats (PHs) under the current climate and three climatechange scenario by using species distribution models (SDMs). Four climate factors; the minimumtemperature of the coldest month (TMC), the warmth index (WI), summer precipitation (PRS),and winter precipition (PRW) : were used as independent variables for the model. Three generalcirculation models under A1B emission scenarios were used as future climate scenarios for the2050s (2040~2069) and 2080s (2070~2099). Highly accurate SDMs were obtained for N. sericea. Themodel of distribution for N. sericea constructed by SDMs showed that minimum temperature ofthe coldest month (TMC) is a major climate factor in determining the distribution of N. sericea. Thearea above the -4.4℃ of TMC revealed high occurrence probability of the N. sericea. Future PHsfor N. sericea were projected to increase respectively by 4 times, 6.4 times of current PHs under2050s and 2080s. It is expected that the potential of N. sericea habitats is expanded gradually. N. sericea is applicable as indicator species for monitoring in the Korean Peninsula. N. sericea isnecessary to be monitored of potential habitats.