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ROS-Based Reliable 3D Map Creation for Mobile Air Vehicles
Hosub Ryu,Jean-Pierre Lomailza,Kwang-Seok Moon,Hanhoon Park,SungTae Moon 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
This paper proposes a method for localization of a mobile air vehicle and its surrounding 3D scene map creation in indoor environments. The method is simply to integrate between two existing systems: ROS-based 2D map creation system using LIDAR, ROS-based visual SLAM system using RGBD camera. We built a proof-of-concept system and verified its performance through experiments.
Ferroelectricity-driven angular momentum textures: from spins and orbitals to Berry curvatures
Hosub Jin 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
In symmetry-broken crystalline solids, pole structures of angular momentum textures such as spin and orbital angular momentum, and Berry curvature (BC) can emerge, which have been utilized as a versatile tool for various electronic applications. For example, the monopole component of the BC is induced by the time-reversal symmetry breaking, and the BC dipole arises from a lack of inversion symmetry, leading to the anomalous Hall and nonlinear Hall effects, respectively. In this talk, we show that the ferroelectricity can couple to unique spin, orbital and BC distribution, which indeed offers charge- and spin-controllable photocurrents. We also verify the fundamental relation between the ferroelectricity and the dipole component of the angular momentum and BC textures. The ferroelectricity can be a useful and fundamental tool to control the various pseudo-vector textures and the corresponding nonlinear optoelectronic responses.
Hosub Shin,Hye Rang Park,Jeong Eun Park,Seung Hwa Yu,Gibum Yi,Jung Hyo Kim,Wonjun Koh,김현희,Soo-Seong Lee,허진호 한국유전학회 2021 Genes & Genomics Vol.43 No.3
Background Hybridization and polyploidization events are important driving forces in plant evolution. Allopolyploids formed between diferent species can be naturally or artifcially created but often sufer from genetic instability and infertility in successive generations. xBrassicoraphanus is an intergeneric allopolyploid obtained from a cross between Brassica rapa and Raphanus sativus, providing a useful resource for genetic and genomic study in hybrid species. Objective The current study aims to understand the cause of hybrid sterility and pollen abnormality in diferent lines of synthetic xBrassicoraphanus from the cytogenetic perspective. Methods Alexander staining was used to assess the pollen viability. Cytogenetic analysis was employed to monitor meiotic chromosome behaviors in pollen mother cells (PMCs). Origins of parental chromosomes in xBrassicoraphanus meiocytes were determined by genome in situ hybridization analysis. Results The xBrassicoraphanus lines BB#4 and BB#6 showed high rates of seed abortion and pollen deformation. Abnormal chromosome behaviors were observed in their PMCs, frequently forming univalents and inter-chromosomal bridges during meiosis. A positive correlation also exists between meiotic defects and the formation of micronuclei, which is conceivably responsible for unbalanced gamete production and pollen sterility. Conclusion These results suggest that unequal segregation of meiotic chromosomes, due in part to non-homologous interactions, is responsible for micronuclei and unbalanced gamete formation, eventually leading to pollen degeneration and inferior fertility in unstable xBrassicoraphanus lines.