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Dynamics of magnetic skyrmion bags induced by spin-transfer torques
Suyeong Jeong,Hee-Sung Han,Dae-Han Jung,Ganghwi Kim,Ki-Suk Lee 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Magnetic skyrmions are envisioned to be a good candidate for developing the next generation data processing/storage device due to their high stability [1] from the topological charge invariance [2]. In dynamic motions of skyrmions, the topological charge also plays a significant role: propagation direction of the skyrmions relative to the driving forces such as spin-transfer-torque (STT) or spin-orbit-torque (SOT) varies dramatically upon their topological charge, the skyrmion number. Under the STT or SOT, a skyrmion shows a diagonal motion not a parallel motion to the driving force direction, which is known as the skyrmion Hall effect. [3,4] and its direction depends on the sign of the skyrmion number. Recently, a skyrmionium with the skyrmion number of 0 is indicated to cancel out the skyrmion Hall effect by the combination of two skyrmions with opposite signs of skyrmion number [5]. Which reveals that the change in the skyrmion number of magnetic structures can lead to the variety of the skyrmion motions, which contributes to realizing multi-bit memory devices encoded by the skyrmion number. From this point of view, the concept of a skyrmion bag which contains multiple numbers of skyrmions in a larger skyrmion suggests that we can reconfigure the skyrmion number [6]. In this work, we report micromagnetic simulation results on various types of skyrmion bag dynamics under STT. We found that skyrmion bag dynamics varies dramatically depends on the net skyrmion number of skyrmion bags. We believe that our results can contribute to multi-bit information carriers based on skyrmion bags.
김수영(Suyeong Kim),이주형(Joohyung Lee),이지혜(Jihye Lee),황태묵(Taemuk Hwang),정동원(Dongwon Jeong) 한국정보기술학회 2020 Proceedings of KIIT Conference Vol.2020 No.10
이 논문에서는 근현대 지역 잡지를 저장하기 위한 데이터 모델을 제안한다. 최근 근현대 지역 잡지에 대한 데이터베이스 구축이 활발하게 진행되고 있다. 그러나 기존 연구는 정보가 제한적이고 자료의 속성을 정의하기 위해 표준을 준용하지 않는다. 따라서 이 논문에서는 기존 연구의 문제점을 해결할 수 있는 새로운 데이터베이스 모델을 제안한다. 이를 위해 이 논문에서는 근현대 지역 잡지 정보를 상세화하여 표준 규격에 따라 속성을 정의한다. 또한, 정규화를 통해 설계한 데이터베이스 모델을 검증한다. 제안 모델은 풍부한 잡지 정보를 제공하며 근현대 지역 잡지를 위한 표준 데이터 모델 개발에 기여한다. This paper proposes a data model for modern local magazines. Recently, databases for modern local magazines have been actively building. However, the existing studies provide limited information and do not follow standards to define attributes of data. Therefore, this paper proposes a new database model to resolve the problems of the existing studies. To this end, this paper details the information of modern local magazines and defines the attributes according to the specifications. The database model designed is verified through normalization. The proposed model provides abundant information of magazines and contributes to the development of standard data models for modern local magazines.
정확한 대기오염물질 배출 지정 탐지를 위한 드론 비행 궤도에 관한 연구
김수영(Suyeong Kim),이석훈(Sukhoon Lee),정동원(Dongwon Jeong) 한국정보통신학회 2021 한국정보통신학회 종합학술대회 논문집 Vol.25 No.2
이 논문에서는 정확한 대기오염물질 배출 지정 탐지를 위한 드론 비행 궤도 방법을 제안한다. 공단과 같이 공장이 많은 지역에서 감시가 소홀한 상황에 대기오염물질을 불법 배출하는 사업장들이 존재한다. 기존에는 드론을 이용하여 이러한 지역에서 대기오염물질을 측정하기 위한 연구들이 활발히 진행되었다. 드론을 활용한 측정 방법은 공장의 굴뚝 주변에 멈춰서 오염을 탐지하는 방식을 사용하지만, 기압과 바람 등의 환경 요소에 따라 대기오염물질 탐지가 부정확하다는 문제를 지닌다. 따라서 이 논문에서는 정확한 대기오염물질 배출 지정 탐지를 위한 드론 비행 궤도 방법을 제안한다. 제안 방법은 드론이 굴뚝을 회전하면서 위로 비행하는 스크류 궤도 비행 방법으로, 굴뚝의 전체 면적을 탐지하고 환경 요소를 고려해 측정한다. 실험에서 제안 방법이 기존 방법보다 나은 성능을 보였다. This paper proposes a drone flight trajectory method for accurate air pollutant emission designation detection. In areas with many factories, such as industrial complexes, there are workplaces that illegally emit air pollutants in a situation where monitoring is neglected. In the past, studies have been actively conducted to measure air pollutants in these areas using drones. The measurement method using a drone uses a method of detecting pollution by stopping around the chimney of a factory, but it has a problem in that the detection of air pollutants is inaccurate depending on environmental factors such as air pressure and wind. Therefore, this paper proposes a drone flight trajectory method for accurate air pollutant emission designation detection. This paper devises a screw orbit flight method in which a drone flies upward while rotating the chimney, and the total area of the chimney is detected and measured considering environmental factors. In the experiment, our proposal shows a higher performance than the existing method.
대기오염 배출구의 정확한 오염도 측정을 위한 5-point 수집 비행 알고리즘
김수영(Suyeong Kim),정현준(Hyunjun Jung),이석훈(Sukhoon Lee),정동원(Dongwon Jeong) 한국정보기술학회 2022 한국정보기술학회논문지 Vol.20 No.2
As interest in air pollution has been increasing day by day, research also has been conducted to measure air pollution in various fields for air quality management. In particular, research using drones is actively has been conducted, and the existing methods for measuring air pollution using drones collect samples from above the air pollution outlet. However, those methods do not consider the effect of wind and have still a limitation in that it cannot measure the accurate pollution. Therefore, this paper proposes the 5-point collection flight algorithm to measure the accurate pollution. The 5-point collection flight algorithm determines the final pollution by measuring the pollution data at five points of an air pollution outlet. In the comparative evaluation, the proposed method shows higher accuracy in measuring pollution.