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Vision-Based 3D Reconstruction Using a Compound Eye Camera
Wooseok Oh,Hwiyeon Yoo,Timothy Ha,Songhwai Oh 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
The vision-based 3D reconstruction methods have various advantages and can be used in various applications such as navigation. Although various vision-based methods are being studied, it is difficult to reconstruct many parts at once with a general camera because of a small FOV. To solve this problem, we propose a coarse but lightweight reconstruction method using a camera with a unique structure called a compound eye with various advantages such as large FOV. In the process, we devise a network that performs depth estimation on a compound eye structure to obtain a depth image containing 3D information from an RGB image. We tested our methods by collecting data using a compound eye camera implemented in a Gazebo simulation and simulation scenes we created. As a result, our 3D reconstruction method using the data we collected and the confidence score from our depth estimation result, can capture the environment with a high recall of 97.51%.
Oh, Wooseok,Rhee, Choong Kyun,Han, Jeong Woo,Shong, Bonggeun American Chemical Society 2018 The Journal of Physical Chemistry Part C Vol.122 No.40
<P>Bismuth is known to exhibit high selectivity toward production of HCOOH when used as an electrocatalyst for reduction of CO<SUB>2</SUB>. However, the current deficiency of knowledge on the surface chemical properties of Bi hinders mechanistic understanding and efficient development of Bi catalysts. In this study, molecular adsorption phenomena on the Bi(111) surface related to the electrocatalytic reduction of CO<SUB>2</SUB> (ERC) are studied using dispersion-corrected density functional theory calculations. It is shown that the Bi(111) surface is inert toward adsorption of molecular species other than O<SUB>2</SUB>, such as CO, CO<SUB>2</SUB>, and HCOOH, confirming the low chemical reactivity of the surface. The adsorbates with O-Bi bonds are systematically more stable than those with C-Bi bonds. As a result, *OCHO (formate) is significantly preferred over *COOH (carboxyl), leading to selective formation of HCOOH over CO as ERC product. Direct formation of *OCHO by proton-coupled electron transfer to CO<SUB>2</SUB> is suggested as the reaction mechanism for ERC. Structural, vibrational, and electronic details of these two adsorbates are provided to guide future experimental mechanistic studies.</P> [FIG OMISSION]</BR>
Oh, Hansik,Lee, Wooseok,Lee, Hwiseob,Koo, Hyungmo,Oh, Sungjae,Hwang, Keum Choel,Lee, Kang-Yoon,Park, Cheon-seok,Yang, Youngoo IEEE 2017 IEEE microwave magazine Vol.18 No.1
<P>This article presents a 4:1 wide-band balun that won the student design competition for wide-band baluns held during the 2016 IEEE Microwave Theory and Techniques Society (MTT-S) International Microwave Symposium (IMS2016) in San Francisco, California. For this contest, sponsored by Technical Committee MTT-17, participants were required to implement and evaluate their own baluns, with the winning entry achieving the widest bandwidth while satisfying the conditions of the competition rules during measurements at IMS2016. Some of the conditions were revised for this year's competition compared with previous competitions as follows.</P>