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Byungmin Sohn,Bong-Ju Kim,Jun Woo Choi,Seo Hyoung Chang,Jung Hoon Han,Changyoung Kim 한국물리학회 2020 Current Applied Physics Vol.20 No.1
A controversy arose over the interpretation of the recently observed hump features in Hall resistivity ρxy from ultra-thin SrRuO3 (SRO) film; it was initially interpreted to be due to topological Hall effect but was later proposed to be from existence of regions with different anomalous Hall effect (AHE). In order to settle down the issue, we performed Hall effect as well as magneto-optic Kerr-effect measurements on 4 unit cell SRO films. Clear hump features are observed in ρxy, whereas neither hump feature nor double hysteresis loop is seen in the Kerr rotation which should be proportional to the magnetization. In addition, magnetization measurement by superconducting quantum interference device shows no sign of multiple coercive fields. These results show that inhomogeneous AHE alone cannot explain the observed hump behavior in ρxy data. We suggest that emergence of the hump structure in ρxy is closely related to the growth condition.
Evolution of electronic band reconstruction in thickness‑controlled perovskite SrRuO3 thin films
Sohn Byungmin,Kim Changyoung 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.12
Transition metal perovskite oxides display a variety of emergent phenomena which are tunable by tailoring the oxygen octahedral rotation. SrRuO3, a ferromagnetic perovskite oxide, is well known to have various atomic structures and octahedral rotations when grown as thin flms. However, how the electronic structure changes with the flm thickness has been hardly studied. Here, using angle-resolved photoemission spectroscopy and electron difraction techniques, we study the electronic structure of SrRuO3 thin flms as a function of the flm thickness. Diferent reconstructed electronic structures and spectral weights are observed for flms with various thicknesses. We suggest that octahedral rotations on the surface can be qualitatively estimated via comparison of intensities of diferent bands. Our observation and methodology shed light on how structural variation and transition may be understood in terms of photoemission spectroscopy data.
An Efficient Feature Extraction Method for Facial Images based on Integral Histogram
Byungmin Kim,Sangheon Lee,Myoungkyu Sohn,Jangwoo Lee 한국멀티미디어학회 2011 한국멀티미디어학회 국제학술대회 Vol.2011 No.-
Feature descriptors based in Local Binary Patterns (LBP) are widely used for face recognition and other texture analysis areas because of their simplicity of computation and robustness with respect to illumination. We propose a novel method that dramatically reduces the computation time of LBP feature vectors using an integral histogram. The proposed method can compute a feature vector in constant time by pre-calculating the integral histogram of the entire image area. Moreover, with this method the computation time for feature vectors of different areas and shapes of local regions is the same. In our experiments, we verified that LBP-based face detection speed is greatly improved by applying our approach to LBP face descriptors. In this paper, we present the proposed methods and the application of our approach to face detection; we also discuss our experimental results.
손 동작 인식을 이용한 인터랙티브 TV 컨트롤 시스템(ITCS)의 설계 및 구현
손명규(Myoungkyu Sohn),이상헌(Sangheon Lee),김병민(Byungmin Kim),이장우(Jangwoo Lee),박지호(Chiho Park) 한국정보과학회 2010 한국정보과학회 학술발표논문집 Vol.37 No.2C
본 논문에서는 점점 더 복잡해지고 다양한 기능을 가진 기기를 제어하는데 있어서 효과적인 사용자 인터페이스를 제공하기 위하여 손동작을 이용한 사용자 인터페이스 시스템을 설계하고 이를 구현하였다. 시스템은 사용자의 손동작을 인식하기 위한 동작인식 부분과 인식된 결과를 가지고 기기를 제어하기 위한 부분으로 두 나누어 설계되었다. 동작인식을 위한 부분은 카메라에 입력된 영상을 이용하여 손 검출, 손 트래킹, 손 제스쳐 인식단계로 나누어 설계되었다. 또한 ITCS를 구현하는데 있어서 개인화 된 서비스를 제공하기 위하여 얼굴인식 부분을 추가하였다. 얼굴인식은 얼굴등록, 얼굴검출, 얼굴인증 모듈로 구현되었다. 이러한 얼굴인증을 통하여 시청연령 제한, 선호채널 추천 등의 다양한 개인화 서비스를 제공할 수 있다. 동작인식을 위한 사용자 편의의 제스쳐를 정의하고 TV 메뉴와 연계하여 사용자가 사용할 수 있도록 하였다. 이러한 기능들이 실시간으로 동작하기 위한 방법들을 제안하였다.
Design of Intelligent Home Media Server
Sangheon Lee,Myoungkyu Sohn,Chiho Park,Byungmin Kim,Chulho Won,Dongwook Kim,Junghyun Lee 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-
Home TV systems were developed from black and white to color, and have also changed from a cathode-ray tube to LCD. Today, Internet IPTV connected to the network is being developed. In this paper, we discuss the current state of Internet IPTV and how it could develop in the future. If TV connected to the Internet is possible, bidirectional communications will support various additional services, and the set-top box of the TV will be a media box that can be developed to a higher value in homes. Consequently, the user will have the opportunity to acquire more intelligent service because of the increase in memory and an operation process for processors. We will also design an intelligent service for a future environment in the home which is based on t IPTV and explain the service scenario.