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자율주행차 개발 및 평가를 위한 테스트 시나리오 생성 프레임워크
성지훈(Jihoon Sung),김기훈(Gihoon Kim),김웅진(Eungjin Kim),손혁주(Hyukju Shon),양찬욱(Chanuk Yang),최재호(Jaeho Choi),허건수(Kunsoo Huh) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In general, vehicle development process follows V-Process, which consists of multiple development and evaluation stages, so test scenarios can be one of the ways to set the direction of development. In the case of Advanced Driver Assistance System(ADAS), the evaluation of their performance is conducted in functional unit level, such as lane change assist and lane keeping. However, as the level of the autonomous driving increases, it is necessary to evaluate autonomous driving technology not only at the functional units level, but also whether it is possible to drive within Operational Design Domain(ODD). Until now, for systems higher than level 2, the testing has been replaced by achieving the target distance in the corresponding ODD, but since most of distances are filled on general driving conditions, safety cannot be guaranteed against to various events that may occur in there. Therefore, recently, many studies have been studied to evaluate various situations at the scenario level, such as the PEGASUS project. In this paper, we analyze the already published scenario-level approaches, and construct the relationship between them. Then, an integrated test scenario generation framework is proposed based on organized contents. The proposed method can derive test scenarios for high-level autonomous driving as well as low-level one, and is expected to be used to generate test scenarios for future technology development.
유기계 슈퍼커패시터에서 도전재의 양이 전기화학적 특성에 미치는 영향
양인찬,이기훈,정지철,Yang, Inchan,Lee, Gihoon,Jung, Ji Chul 한국재료학회 2016 한국재료학회지 Vol.26 No.12
In this study, we intensively investigated the effect of conductive additive amount on electrochemical performance of organic supercapacitors. For this purpose, we assembled coin-type organic supercapacitor cells with a variation of conductive additive(carbon black) amount; carbon aerogel and polyvinylidene fluoride were employed as active material and binder, respectively. Carbon aerogel, which is a highly mesoporous and ultralight material, was prepared via pyrolysis of resorcinol-formaldehyde gels synthesized from polycondensation of two starting materials using sodium carbonate as the base catalyst. Successful formation of carbon aerogel was well confirmed by Fourier-transform infrared spectroscopy and $N_2$ adsorption-desorption analysis. Electrochemical performances of the assembled organic supercapacitor cells were evaluated by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy measurements. Amount of conductive additive was found to strongly affect the charge transfer resistance of the supercapacitor electrodes, leading to a different optimal amount of conductive additive in organic supercapacitor electrodes depending on the applied charge-discharge rate. A high-rate charge-discharge process required a relatively high amount of conductive additive. Through this work, we came to conclude that determining the optimal amount of conductive additive in developing an efficient organic supercapacitor should include a significant consideration of supercapacitor end use, especially the rate employed for the charge-discharge process.