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Robustness Analysis of Network Modularity
Kim, Jongrae,Cho, Kwang-Hyun IEEE 2016 IEEE transactions on control of network systems Vol.3 No.4
<P>Modules are commonly observed functional units in large-scale networks and the dynamics of networks are closely related to the organization of such modules. Modularity analysis has been widely used to investigate the organizing principle of complex networks. The information about network topology needed for such modularity analysis is, however, not complete in many real-world networks. We noted that the network structure is often reconstructed based on partial observation and, therefore, it is re-organized as more information is collected. Hence, it is critical to evaluate the robustness of network modules with respect to uncertainties. For this purpose, we have developed a robustness bounds algorithm that provides an estimation of the unknown minimal perturbation, which breaks down the original modularity. The proposed algorithm is computationally efficient and provides valuable information about the robustness of modularity for large-scale network analysis.</P>
Kim, Jongrae,Liu, Linpo,Hu, Zanmin,Jin, EonSeon MDPI 2018 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.19 No.7
<P><I>Chlorella</I> has great potential as a bio-factory for production of value-added compounds. To produce the desired chemicals more efficiently in <I>Chlorella</I>, genetic tools for modification of <I>Chlorella</I> need to be developed, especially an endogenous promoter. In this study, the promoter of photosystem I protein D (<I>psaD</I>) from <I>Chlorella vulgaris</I> UTEX395 was identified. Computational analysis revealed the presence of several putative cis-acting elements, including a potential core element, and light-responsive or stress-responsive elements. Gene expression analysis in heterologous expression system in <I>Chlamydomonas</I><I>reinhardtii</I> and <I>Nicotiana</I><I>benthamiana</I> showed that <I>CvpsaD</I> promoter can be used to drive the expression of genes. Functional analysis of this promoter suggested that the initiator element (Inr) is important for its function (i.e., TATA-less promoter) and that an additional factor (e.g., downstream of the transcriptional start site) might be needed for light response. We have shown that the <I>CvpsaD</I> promoter is functional, but not sufficiently strong, both in microalgae and higher plant.</P>
이공계 대학생이 참여하는 청소년 교육용 과학관 전시 콘텐츠 개발
김승규(Kim, Seunggyu),한현택(Han, Hyeontaek),박종래(Park, Jongrae) 한국공학교육학회 2021 공학교육연구 Vol.24 No.3
The purpose of this study is for science and engineering students to experience social contribution through voluntary projects. The method of research is to create and introduce the exhibits and its exhibition commentary of Science Museum for local youth. The exhibition commentary is a project that stimulates student‘s interests in science and technology by providing scientific knowledge and research information. Producing exhibits is a project that discovers local technologies as well as introduces its history, technology, and scientific principles to young students. Two projects confirmed the positive effects of creating opportunities for science and engineering students to contribute to society and expanding scientific content, and showed implications for engineering education.
Attitude Control System Design & Verification for CNUSAIL-1 with Solar/Drag Sail
Yoo, Yeona,Kim, Seungkeun,Suk, Jinyoung,Kim, Jongrae The Korean Society for Aeronautical and Space Scie 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4
CNUSAIL-1, to be launched into low-earth orbit, is a cubesat-class satellite equipped with a $2m{\times}2m$ solar sail. One of CNUSAIL's missions is to deploy its solar sail system, thereby deorbiting the satellite, at the end of the satellite's life. This paper presents the design results of the attitude control system for CNUSAIL-1, which maintains the normal vector of the sail by a 3-axis active attitude stabilization approach. The normal vector can be aligned in two orientations: i) along the anti-nadir direction, which minimizes the aerodynamic drag during the nadir-pointing mode, or ii) along the satellite velocity vector, which maximizes the drag during the deorbiting mode. The attitude control system also includes a B-dot controller for detumbling and an eigen-axis maneuver algorithm. The actuators for the attitude control are magnetic torquers and reaction wheels. The feasibility and performance of the design are verified in high-fidelity nonlinear simulations.