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조이현(L. H. Cho),김인기(I. G. Kim),이재일(J. I. Lee),장영록(Y. R. Jang),박인호(I. H. Park),최성을(S. E. Choi),권명희(M. H. Kwon) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.3
The magnetism and electronic structure of Ru monolayer with square lattice is investigated using the FLAPW band method. The dependence of total energies on the lattice constant was calculated for three magnetic states, i.e., para-, ferro-, and antiferromagnetic ones. It was found that there is no energy difference between para- and antiferromagnetic states for all the lattice constant. The possibility of antiferromagnetism in square Ru monolayer is thus excluded. The ferromagnetic state is most stable for the lattice constants greater than 7.30 a.u. The energy minimum is found at the lattice constant of 6.53 a.u. where it is paramagnetic. It is calculated that the magnetic moment is 2.49 μ_B at 7.72 a.u., which is close to the lattice constant of Ag. The magnetic moment is almost saturated to be 2.57 μ_B at the lattice constant of 7.86 a.u.
The Electronic Structure and Magnetism of bcc Rh(001) Surface
조이현(L.H. Cho),B. Bialek,이재일(J. I. Lee) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.6
According to the recent reports the bulk bcc Rh is ferromagnetic with a small difference of energy compared to paramagnetic state. In this study, the electronic structure and magnetism for bcc Rh(001) surface are investigated by means of the all-electron full potential linearized augmented plane wave method within the generalized gradient approximation. It is found that the surface ferromagnetic state is preferable over the paramagnetic one. For unrelaxed system, the magnetic moment of the surface layer, 0.48 μ<SUB>B</SUB>, is slightly increased comparing with the bulk value, 0.41 μ<SUB>B</SUB> while the value of the subsurface layer, 0.23 μ<SUB>B</SUB>, is much smaller than the bulk value. The total energy and atomic force calculations show that the surface layer is relaxed downward and the subsurface layer moves upward to reduce the layer distance between the surface and subsurface layers by 7.0 %. The relaxation effect leads to weakening the surface magnetic properties. Specifically, the value of the magnetic moment of the surface atom is decreased to 0.36 μ<SUB>B</SUB>. Since the spin polarization of the subsurface layer is only 0.14 μ<SUB>B</SUB>, it is concluded that the bcc Rh(001) surface is rather weakly ferromagnetic.
하반신 마비환자의 보행보조시스템 제어를 위한 저항 센서 슈트 개발
장은혜,지수영,이재연,조영조,전병태,Jang, E.H.,Chi, S.Y.,Lee, J.Y.,Cho, Y.J.,Chun, B.T. 대한의용생체공학회 2010 의공학회지 Vol.31 No.4
The purpose of this study was to develop the FSR sensor suit that controls walking assist device for paraplegic patients. The FSR sensor suit was to detect user's intent and patterns for walking by measuring pressure on the palm and the sole of user's foot. It consisted of four modules: sensing pressure from palm, changing modes and detecting pressure on the palm/at the wrist, sensing pressure from the soles of user's foot, and host module that transmit FSR data obtained from sensing modules to PC. Sensing modules were connected to sensing pads which detect analog signals obtained from the palm or the sole of foot. These collect signals from the target regions, convert analog signals into digital signals, and transmit the final signals to host module via zigbee modules. Finally, host modules transmit the signals to host PC via zigbee modules. The study findings showed that forces measured at the palm when using a stick reflected user's intent to walk and forces at the sole of the user's foot revealed signals detecting walking state.
장영록(Y.-R. Jang),조철수(Chulsu Jo),이재일(J. I. Lee) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.6
We investigated the structural and magnetic properties of Fe-Pt nanowires with linear and zigzag structures by using first-principle calculational methods. Structural degrees of freedom are optimized, the bond lengths and bond angles are determined, magnetic moments, spin density, and density of states are calculated. Results show that the zigzag structure is more stable than the linear one, and has a longer bond length and smaller magnetic moments for both Fe and Pt atoms.
3차원 가상도시 모델에서 높이맵을 이용한 CNN 기반의 그림자 탐지방법
윤희진,김주완,장인성,이병대,김남기 한국인터넷정보학회 2019 인터넷정보학회논문지 Vol.20 No.6
Recently, the use of real-world image data has been increasing to express realistic virtual environments in various application fields such as education, manufacturing, and construction. In particular, with increasing interest in digital twins like smart cities, realistic 3D urban models are being built using real-world images, such as aerial images. However, the captured aerial image includes shadows from the sun, and the 3D city model including the shadows has a problem of distorting and expressing information to the user. Many studies have been conducted to remove the shadow, but it is recognized as a challenging problem that is still difficult to solve. In this paper, we construct a virtual environment dataset including the height map of buildings using 3D spatial information provided by VWorld, and We propose a new shadow detection method using height map and deep learning. According to the experimental results, We can observed that the shadow detection error rate is reduced when using the height map. 최근 교육, 제조, 건설 등 다양한 응용 분야에서 사실적인 가상환경을 표현하기 위하여 실세계 영상데이터를 활용하는 사례가 증가하고 있다. 특히, 스마트 시티 등 디지털 트윈에 대한 관심이 높아지면서, 항공 영상 등 실제 촬영한 영상을 이용하여 현실감 있는 3D 도시 모델을 구축하고 있다. 그러나, 촬영된 항공 영상에는 태양에 의한 그림자가 포함되어 있으며, 그림자가 포함된 3D 도시 모델은 사용자에게 정보를 왜곡시켜 표현하는 문제를 안고 있다. 그림자를 제거하기 위하여 그동안 많은 연구가 진행되었지만, 아직 까지 해결하기 어려운 도전적인 문제로 인식되고 있다. 본 논문에서는 VWorld에서 제공하는 3차원 공간정보를 이용하여 건물의 높이맵을 포함한 가상환경 데이터 셋을 구축하고, 높이맵과 딥러닝을 이용한 새로운 그림자 탐지 방법을 제안한다. 실험 결과에 의하면, 높이맵을 사용했을 때 기존 방법보다 그림자 탐지 에러율이 감소한 것을 확인할 수 있다.