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민경욱(KyoungWook Min),박재혁(JaeHyuck Park),김주영(Jooyoung Kim),최정단(JeongDan Choi) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
자율주행 기능에서 정지차량 회피 기능은 가장 기본 기능 중에 하나이다. 정지차량 회피를 하기 위해서는 차량의 상태를 정확하게 파악해야하지만, 기존에는 휴리스틱한 방법으로 회피 일부 기능을 구현해 왔다. 즉, 전방 주행차로에 위치한 차량이 정지상태이고, 옆차로의 차량이 주행중인 상황인 경우에, 일정시간 대기했다가 회피하는 방식에 대한 제한적인 기능구현이었다. 본 논문에서는 정지차량의 상태를 파악하기 위하여 차량 후미등을 기계학습으로 인식하고 후미등과 고정밀 맵을 융합하여 상황인식을 통해 회피 결정을 하고 회피하기 위한 지역경로를 생성하는 회피 기능을 구현하였다.
‘신중국(新中國)’ 잔혹사(殘酷史)에 대한 은밀한 풍자와 비판 - ≪관추편(管錐編)ㆍ사기회주고증(史記會註考證)≫ 제칠(第七)ㆍ팔칙찰기(八則札記)
閔庚旭 ( Min Kyoungwook ) 중국어문연구회 2020 中國語文論叢 Vol.0 No.101
The search for genuine creative motives, principles of creation, and main subject of Guanzhui bian remain a long-term academic cold case despite it’s importance and attention. This article is one of a series of attempts to identify this. Chapter 2 analyzes the creative motive of the seventh paragraph of shiji in Guanzhui bian. Through this, it will be revealed that this paragraph is actually based on Guo Moruo’s < Essays on Suiyuanshihua >, and the hidden theme of this paragraph is the brutal political repression and restrictions on freedom under the socialist ideology. It also reviews the relationship between this paragraph and George Orwell’s Animal Farm. Chapter 3 analyzes the creative motive of the eighth paragraph of shiji in Guanzhui bian. Through this, it will be revealed that this paragraph is actually based on the < Second documents on Hu Feng anti-party gruop > published in the People’s Daily, and the hidden theme of this paragraph is satire and criticism on the pressure on discussion and freedom of speech in the Hu Feng incident. In addition, the significance of Guanzhui bian as resistance literature is reviewed. In the conclusion, the reason why Qian Zhongshu intends to confront Maoism, which was the main ideology of mainland China at the time, through his writings in Guanzhui bian, in terms of ideological resistance to Mao’s oppression of Liberalism.
Reduced ion mass effects and parametric study of electron flat-top distribution formation
홍진희,이은상,민경욱,Hong, Jinhy,Lee, Ensang,Parks, George K.,Min, Kyoungwook 한국천문학회 2012 天文學會報 Vol.37 No.2
In particle-in-cell (PIC) simulation studies related to ion-ion two-stream instability, a reduced ion-to-electron mass ratio is often employed to save computation time. But it was not clearly verified how electrons dynamics are coupled with the slower evolution of ion-ion interactions under the external electric field. We have studied the ion beam driven instability using a 1D electrostatic PIC code by comparing different rescaling of parameter with real ion mass from the reference simulation with reduced ion mass. As the external electric field is stronger, the excited unstable mode range was more sensitively affected by the system size with the real mass ratio than the reduced ion mass. The results show that the reduced mass ratio should be used cautiously in PIC code as the electron dynamics can modify the ion instabilities. Additionally we found the formation of electron flat-top distribution in the final saturation stage. Simulation results show that in the early phase electrostatic solitary waves are quasi-periodically formed, but later they are fully dissipated resulting in heated, flat-top distributions. New electron beam components are occasionally formed. These are a consequence of the interaction with solitary wave structures. We parametrically investigate the development of electron phase space distributions for various drift speeds of ion beams and temperature ratios between ions and electrons