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수직자성박막에서 자구벽 속도 측정을 통한 샘플 재현성 확인 방법
문준(Joon Moon),이성협(Seong-Hyub Lee),김기태(Kitae Kim),박정현(Jung-Hyun Park),장준영(Jun-Young Chang),유지성(Ji-Sung Yu),최석봉(Sug-Bong Choe) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.5
In this study, a method was developed to confirm the deposition reproducibility of the magnetic layer thickness through the magnetic domain wall velocity analysis in the perpendicular magnetic thin film. We analyzed the effect of magnetic layer thickness and magnetic anisotropy on the magnetic domain wall motion occurring in a perpendicular magnetic thin film composed of Pt/Co/Pt. It was confirmed that the creep scaling constant (α) changed rapidly in the thickness regime of the magnetic layer where perpendicular magnetic anisotropy was formed. Using this, it is possible to check the change of α with respect to the change in the thickness of the magnetic layer of several A.
Transient Improvement Algorithm in Digital Images
Kwon Ji-Yong(권지용),Chang Joon-Young(장준영),Lee Min-Seok(이민석),Kang Moon-Gi(강문기) 한국방송·미디어공학회 2010 한국방송공학회 학술발표대회 논문집 Vol.2010 No.7
Digital images or videos are used in modern digital devices. The resolution of HDTV in digital broadcasting system is higher than that of previous analog systems. Also, mobile phone with 3G can provide images as well as video streaming services in realtime. In these circumstances, the visual quality of images has become an important factor. We can make image clear by transient improvement process that reduces transient in edges. In this paper, we present an transient improvement algorithm. The proposed algorithm improves edges by making smooth edge to steep edge. Before performing transient improvement algorithm, edge detection algorithm should be operated. Laplacian operator is used in edge detection, and the absolute value of it is used to calculate gain value. Then, local maximum and minimum values are computed to discriminate current pixel value to raise up or pull down. Compensating value that gain value multiplies with the difference between maximum (or minimum) value and current pixel value adds (or subtracts) to current pixel value. That is, improved signal is generated by making the narrow transient of edge. The advantage of proposed algorithm is that it doesn't produce shooting problem like overshoot or undershoot.
비점오염원 저감을 위한 요소기술의 연계처리 운전 효과 검토
김화중 ( Wha Jung Kim ),박준석 ( Jun Seok Park ),서대석 ( Dae Seuk Seo ),김봉균 ( Bong Kyun Kim ),이준헌 ( Joon Heon Lee ),장준영 ( Jun Young Chang ),오종민 ( Jong Min Oh ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.1
Because reduction facilities of existing non-point pollution source weren`t balanced with each element technologies, most of case were what damaged scene nature of river, neutralized pollution sources and reduction effect. Therefore it`s necessary to find a solution by integrating the operation system. Based on the comparative analysis that we have ran, we examined the capacity at individual operation`s water purification and linked the treatment to detention pond, constructed wetlands and revetment. The results of an experiment revealed that the Individual Operation shows a high level of processing performance. However, in terms of definitive processing performance linked treatment operation showed a higher level than element technology. Although performance of the Individual Operation was declined due to media clogging etc, linked treatment operation showed consistent efficiency. Therefore it has been evaluated that the linked treatment operation would improve performance on pollutant purification and run a stable operation.