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전기자동차 시스템 모델링 및 주행 환경에 따른 배터리 응답 특성 연구
추용주,박준영,박광민,이승엽,Chu, Yong-Ju,Park, Jun-Young,Park, Gwang-Min,Lee, Seung-Yop 대한임베디드공학회 2022 대한임베디드공학회논문지 Vol.17 No.2
Currently, various researches on electric vehicle battery systems have been conducted from the viewpoint of safety and performance for SoC, SoH, etc. However, it is difficult to build a precise electrical model of a battery system based on the chemical reaction and SoC prediction. Experimental measurements and predictions of the battery SoC were usually performed using dynamometers. In this paper, we construct a simulation model of an electric vehicle system using Matlab Simulink, and confirm the response characteristics based on the vehicle test driving profiles. In addition, we show that it is possible to derive the correlation between the SoC, voltage, and current of the battery according to the driving time of the electric vehicle in conjunction with the BMS model.
임펠러와 다중 격벽 구조를 이용한 미세조류용 광생물반응기 개발
추용주(Yong Ju Chu),이상효(SangHyo Lee),김견우(Kyunwoo Kim),이동준(DongJun Lee),이승엽(SeungYop Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Recently, microalgae are considered as one of the most practical energy sources for biofuel, instead of fossil fuel. For the production of microalgae biomass, various closed types of photobioreactors have been developed to solve the problems such as mass transfer, contamination, light distribution and carbon dioxide supply. In this study, a cylindrical type, internally radiating photobioreactor is proposed. This bioreactor has a multi-layered wall including light emitting diodes to maximize the surface to volume ratio for cultivation of microalgae. Furthermore, a spiral-type impeller of the bioreactor is designed to have the optimal values of internal flow velocity and carbon dioxide distribution, using CFD simulations.
2차원 형상 제시를 위한 SMA에 기반한 와이어프레임 구조의 개발
추용주(Yong-Ju Chu),송재복(Jae-Bok Song) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.5
This paper proposes a novel method of 2 dimensional shape display. Shape displays allow us to feel the actual volume of the object, unlike conventional 2D visual displays of 3D objects. The proposed method employs a wireframe structure to present 2D or 3D objects. The wireframe is composed of small units driven by shape memory alloy (SMA) actuators. The drive unit is analogous to the agonist-antagonist system of animal musculoskeletal systems. where the SMA actuators serve as agonist and antagonist muscles. The force in the SMA actuator is controlled by electrical current. The drive unit is equipped with the locking mechanism so that it can sustain the external force exerted by the user as well as the own weight of the wireframe structure. By controlling the current into the SMA actuator and locking mechanism, we can control the angle of the drive unit. A chain of drive units enables presentation of 2 dimensional objects. 3 dimensional presentations are possible by collecting the chains of drive units.