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차량-인프라간 통신 기반의 자동 발렛 파킹을 위한 고장 감지 및 진단
최희재(Heejae Choi),이지민(Jimin Lee),송봉섭(Bongsob Song) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This paper presents a fault detection and diagnosis (FDD) method for automatic valet parking in the presence of faults in actuators and vehicle-to-infrastructure (V2I) communication. Based on the analysis of field test data, four possible fault scenarios are considered, i.e., faults of position and heading angle measurements and ones in the steering and brake actuators. The proposed FDD method is based on multiple nonlinear observers to estimate the position and heading angle with consideration of packet loss via V2I communication, and a double-threshold-statistical-testing technique to reduce a false alarm. Finally, the performance of the proposed algorithm will be validated through the field test data including the faults.
최희재(Heejae Choi),김도현(Dohyun Kim),송봉섭(Bongsob Song) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The unified lateral control algorithm for automatic valet parking for various types of vehicles is presented and its feasibility is shown experimentally via field tests for the given parking scenario. With consideration of different types of vehicles and operating conditions, a kinematic vehicle model with design parameters for different maneuvers is proposed and validated using field test data. Furthermore, trajectory generation for forward driving and parking maneuvers is developed and the lateral vehicle controller based on a nonlinear control technique is designed for the vehicle model. Finally the proposed lateral control algorithm is validated via simulations for different types of vehicles and experimentally using a test vehicle through field tests.
최희재 ( Heejae Choi ) 한국프랑스어문교육학회 2021 프랑스어문교육 Vol.74 No.-
Cette étude a pour objectif d'analyser les facteurs qui amènent les apprenants à se démotiver dans leur apprentissage, et ainsi de contribuer à l'amélioration de l'enseignement du français pour les étudiants de licence d'études françaises dans les universités coréennes. Après avoir préalablement défini la notion de « démotivation » dans l'apprentissage d'une langue étrangère et fait le point sur les recherches précédentes menées à l'étranger et en Corée, nous effectuons une enquête auprès de 72 étudiants ayant pour majeure d'études le français pour analyser les facteurs de leur démotivation. Ces analyses nous amènent enfin à élucider son origine : la première source influençant le plus leur démotivation provient des apprenants eux-mêmes, la deuxième est liée aux méthodologies d'enseignement, la troisième à l'environnement d'apprentissage et la dernière aux enseignants. Le point intéressant est que si le sexe et le niveau de compétence sont en corrélation avec leur démotivation, la durée d'apprentissage, elle, ne l'est pas.
최희재 ( Hee Jae Choi ) 한국제임스조이스학회 2004 제임스조이스저널 Vol.10 No.1
We can see the text Ulysses not simply as a mixture of traditional realism and postmodernism but as a text in process that exiles a fixed meaning though without disregarding it. In other words Ulysses is not a traditional `phenotext` full of logic and grammar but a text where `genotext` disturbs `phenotext` and ignites itself into a text / subject in process. In the encyclopaedic styles of Ulysses we can see a dialectical balancing between a `phenotext` communicating with the readers and a `genotext` revealed through extreme style experimentations. Ulysses does not lead to either side of extreme. Every chapter has its own particular dynamical dialectic that activates the book into text in process. This involves many features such as intersubjectivity (first six chapters), desire to break and trespass the first style (Aeolus), desire to return to it (Lestrygonians), dancing of language (Scylla and Charybdis), fragments with an invisible thread connecting them (Wandering Rocks), language turning to music or text to a human body (Siren, Nausicaa), ironies reformulated in postmodernism (Cyclops), pastiche transforming the plagiarized style and Ulysses text (Oxen of the Sun), limited mundane point of view from `phenotext` (Eumaeus), scientifically well-educated but narrow point of view that fails to control the text (Ithaca), and Molly`s monologue full of `genotext` oppressed under the `phenotext` (Penelope).
최희재(Choi, Hee Jae),박정일(Park, Jung Il),최승영(Choi, Seung Young) 한국지적정보학회 2013 한국지적정보학회지 Vol.15 No.1
최근 IT 및 네트워크 기술 발달에 따라 스마트폰, 태블릿PC 등 모바일 기기가 확산되었다. 이에 따라 각종 어플리케이션이 개발됨은 물론 새로운 업무형태인 스마트워크가 출현하게 되었다. 본 연구는 스마트워크를 이용하여 기존 PC 기반의 지적기준점 서비스를 새로운 지적기준점관리시스템으로 발전시켜 지적기준점 관리 및 활용을 극대화 하는데 목적이 있다. 이를 위하여 우선 기존의 지적기준점 관리 현황을 파악하고 각 기관에서 관리하고 있는 기준점의 활용사례를 검토하고자 한다. 다음으로 지적기준점 관리를 위한 스마트워크 시스템에 필요한 기능 및 사양을 구상하고 목표 시스템 개발을 위한 기초 연구를 진행하고자 한다. 궁극적으로 본 연구가 각종 공사 등으로 인한 기준점의 훼손 및 망실을 최소화시킴은 물론 체계적인 지적기준점 D/B를 구축·관리의 기틀을 마련하고, 향후 지적재조사 사업의 추진에 따른 국가기준좌표계 변환에 따른 지적측량에 대비하는 등 양질의 지적측량 서비스 구현에 많은 도움이 되었으면 하는 바람이다. Recently, mobile devices such as Smart phones and Tablet PCs have been widely expanded due to the development of IT and network technology. Not only a variety of Apps began to appear, but also the new form of work style called ‘SmartWork’. This research ‘Smart Work’ to greatly improve the management of the cadastral control point by changing the previous PC-based managing service into a new system. To make this in reality, this study suggests firstly, analyzing the current status of cadastral control point and identify the point’s usage managed by each organization. Next, we plan to begin theorizing the necessary programs for ‘SmartWork’ and to begin researching what is necessary for the development of target system. This research will not only minimize the damages of cadastral control point by various construction, but create a set of basic frame of database management. In this, it should help to improve the quality of the cadastral measurement service in further cadastral resurvey project and the changing of the national datum transformation.