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Azure Kinect 기반의 네트워크 서비스를 통한 아바타 제어
오재광(Jaekwang Oh),유지상(Jisang Yoo),권순철(Soonchul Kwon) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문에서는 RGB-D 카메라 Azure Kinect를 통해 획득할 수 있는 깊이와 사람의 관절 정보를 이용하여 유니티 상의 아바타 객체 애니메이터를 생성하고, 유니티 Photon API를 이용하여 네트워킹 서비스를 하는 방법에 관한 내용을 다룬다. Azure Kinect SDK를 통해서 얻은 관절의 정보를 이용해 유니티 상의 humanoid 아바타의 관절과 매칭하고, 실시간의 동작을 입력으로 받아 아바타의 자연스러운 애니메이터를 생성한다. 그러고 나서 Photon 서비스 플랫폼을 이용하여 관절 정보 기반의 정보를 송신하여 네트워킹 서비스를 구현했다. 이 과정 중 초기에 양측의 로컬에서 상대방의 아바타 애니메이터가 실시간으로 동작하지 못하고 눈에 보이는 딜레이가 발생하였다. 이 문제를 송신하는 데이터를 인코딩하여 압축하는 과정을 통해 해결하였고 30fps 속도로 딜레이 없이 동작이 가능해졌다.
Experimental Studies on the Accuracy and Robustness of Yaw&G sensor
Hoochang Lee,Kwangho Yoo,Jaedoo Go,Jaekwang Lee,Wanil Kim 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Yaw & G Sensor measures the vehicle motion of the rotation and the acceleration. Yaw & G Sensor output is mainly sent to ESC for the active safety. It seems obvious that the poor sensor output can mislead the malfunction of system which uses sensor output. Every company insists their sensor has the best performance, but unfortunately, there is no powerful method based on statistical analysis for an accuracy and a robustness. The focus of this paper is the experimental studies on the performance of Yaw & G Sensor using several practical tests. In this paper, a long-term bias stability is analyzed for an accuracy with linear fit line(best-fit line of offset) and allan variance. Plus, an anti-shock and anti-vibration is tested for a robustness with multi-types of shocks and sinusoidal acceleration wave.
Directing Oxygen Vacancy Channels in SrFeO<sub>2.5</sub> Epitaxial Thin Films
Khare, Amit,Lee, Jaekwang,Park, Jaeseoung,Kim, Gi-Yeop,Choi, Si-Young,Katase, Takayoshi,Roh, Seulki,Yoo, Tae Sup,Hwang, Jungseek,Ohta, Hiromichi,Son, Junwoo,Choi, Woo Seok American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.5
<P>Transition-metal oxides (TMOs) with brown-millerite (BM) structures possess one-dimensional oxygen. vacancy channels (OVCs), which play a key role in realizing high ionic conduction at low temperatures. The controllability of the vacancy channel orientation, thus, possesses a great potential for practical applications and would provide a better visualization of the diffusion pathways of ions in TMOs. In this study, the orientations of the OVCs in BM-SrFeO2.5 are stabilized along two crystallographic directions of the epitaxial thin films. The distinctively orientated phases are found to be highly stable and exhibit a. considerable difference in their electronic structures and optical properties, which could be understood in terms of orbital anisotropy. The control of the OVC orientation further leads to modifications in the hydrogenation of the BM-SrFeO2.5 thin films. The results demonstrate a strong correlation between crystallographic orientations, electronic structures, and ionic motion in the BM structure.</P>
Gerelt-Od, Byambasuren,Kim, Hyosung,Lee, Uk Jae,Kim, Jaekwang,Kim, Nayeong,Han, Yoo Joong,Son, Hyungbin,Yoon, Songhun Electrochemical Society 2018 Journal of the Electrochemical Society Vol.165 No.2
<P>A long-term in-situ measurement method for evolved gases in commercial 18650 cylindrical lithium ion batteries (LIBs) is proposed using Raman spectroscopy. Hydrogen, methane, carbon dioxide, and carbon monoxide were the main gases detected from cells at 4.2-4.8 V for 1800 h. Gas evolution rates were determined by the aging time and the staying potential, resulting in a nonlinear partial-pressure-dependence as a function of the aging time. Initially, the evolution of carbon dioxide and carbon monoxide was significant. After potential-dependent onset times, hydrogen and methane generation increased suddenly. At low potential ranges of 4.2-4.4 V, mostly hydrogen gas was generated, whereas at high potential ranges (>4.6 V), methane becames dominant. Even at 4.4 V, importantly, the absolute accumulative H-2 gas pressure was >3 atm, raising the requirement to monitor such gas for better safety even under nominal operating conditions. Moreover, cumulative partial pressures of the detected gases exceeded the range 5-10 atm, which was associated with the staying potential. An evolution mechanism through which the gas is converted from hydrogen to methane is proposed and discussed. The electrochemical analysis of the aged LIBs showed that the capacity fade was accelerated by the increase in the staying potential while the resistances remained similar. (c) 2018 The Electrochemical Society.</P>
Jo, Junhyeon,Byun, Jinho,Oh, Inseon,Park, Jungmin,Jin, Mi-Jin,Min, Byoung-Chul,Lee, Jaekwang,Yoo, Jung-Woo American Chemical Society 2019 ACS NANO Vol.13 No.1
<P>Individual molecular spins are promising quantum states for emerging computation technologies. The “on surface” configuration of molecules in proximity to a magnetic film allows control over the orientations of molecular spins and coupling between them. The stacking of planar molecular spins could favor antiferromagnetic interlayer couplings and lead to pinning of the magnetic underlayer <I>via</I> the exchange bias, which is extensively utilized in ultrafast and high-density spintronics. However, fundamental understanding of the molecular exchange bias and its operating features on a device has not been unveiled. Here, we showed tunable molecular exchange bias and its asymmetrical magnetotransport characteristics on a device by using the metalloporphyrin/cobalt hybrid films. A series of the distinctive molecular layers showcased a wide range of the interfacial exchange coupling and bias. The transport behaviors of the hybrid bilayer films revealed the molecular exchange bias effect on a fabricated device, representing asymmetric characteristics on anisotropic and angle-dependent magnetoresistances. Theoretical simulations demonstrated close correlations among the interfacial distance, magnetic interaction, and exchange bias. This study of the hybrid interfacial coupling and its impact on magnetic and magnetotransport behaviors will extend functionalities of molecular spinterfaces for emerging information technologies.</P> [FIG OMISSION]</BR>