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김상훈(Sanghoon Kim),김덕호(Duck-Ho Kim),김준서(June-Seo Kim),문경웅(Kyoung-Woong Moon),이기석(Ki-Suk Lee),최석봉(Sug-Bong Choe),김갑진(Kab-Jin Kim) 한국자기학회 2018 韓國磁氣學會誌 Vol.28 No.2
We review here the recent progress on the study of the magnetization dynamics as well as the basic principle of the related phenomena. The static properties of the magnetic domain walls and skyrmions as well as their dynamic properties under application of magnetic field and/or spin current are discussed together with the Dzyaloshinskii-Moriya interaction. Finally, the basic principle and recent progress in the antiferromagnetic spintronics are introduced.
사용자 중심의 대화형 IoT 서비스 매쉬업 모델과 엔진
김상훈(Sanghoon Kim),고인영(In-Young Ko) 한국정보과학회 2021 정보과학회논문지 Vol.48 No.5
IoT 환경에서 사용자들은 IoT 기기를 활용한 서비스를 제공받을 뿐만 아니라 서비스 매쉬업을 통해 자신만의 애플리케이션을 생성하고자 한다. 이를 위해 시각적인 방식으로 IoT 서비스 매쉬업을 생성하는 방법들이 제안되었으나, 시각적으로 표현되는 매쉬업의 실행 흐름을 이해하는 것은 쉽지 않기 때문에 사용자들은 매쉬업을 만드는 데 어려움을 겪는다. 본 연구에서는 프로그래밍 경험이 없는 일반 사용자들이 IoT 서비스 매쉬업을 생성하도록 자연어를 통해 상호작용하는 대화형 서비스 매쉬업 모델 및 엔진을 제안한다. 대화형 서비스 매쉬업 모델은 사용자 명령을 파악하기 위한 네 종류 키워드로 구성되며, 엔진은 인터랙션 관리자, 시맨틱 매칭 모듈, 서비스 매쉬업 모듈로 구성된다. 본 연구에서는 스마트 홈 환경에서의 시나리오를 바탕으로 사례 연구를 진행하여, 일반 사용자들이 대화형 서비스 매쉬업 모델 및 엔진을 통해 더 쉽고 편리하게 필요한 서비스 매쉬업을 생성할 수 있음을 확인하였다. In Internet of Things (IoT) environments, users not only consume services that are provided by IoT devices, but also create their own service mashup applications. Several visual-based approaches have been proposed to support users in creating IoT service mashups. However, as it is not easy for users to understand the visually-represented execution flow of a service mashup, they often find it difficult to create them. This study proposes a conversational service mashup model and an engine, which end-users without programming experience can use to create IoT service mashups through a natural language. The conversational service mashup model comprises four types of keywords to identify user commands. The service mashup engine comprises an interaction manager, a sematic matching module, and a service mashup module. To evaluate the proposed model, we conduct a case study based on a smart home IoT environment scenario. The study results confirm that end-users can easily use the conversational service mashup model and the engine to create required IoT service mashups.
김상훈(Sanghoon Kim),곽인재(Injae Kwak),변세희(Sehee Byun),김대우(Daewoo Kim) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
This study relates to the design of a vehicle control system for controlling an electric two-wheeler system with a drive device operating at a high voltage. In recent years, Micro-mobility has been gaining traction as the new means of mobility of the future, and it is expected that in the future the adoption of short-range use or non-owned shared vehicles in the mobility market will expand. Among the micro-mobility, electric two-wheelers are eco-friendly and economical, and in addition to this, vehicle sharing must be accompanied by a battery exchange system and data-based services. In this case, the electric two-wheeler system generally consists of 5 sub-systems : the powertrain system, the energy management system, the cooling system, the vehicle control system, and the connectivity system. In order to control such an electric two-wheeler system, it is necessary to design an appropriate system platform for the element system to be controlled and a design process for each controller. In this paper, we have focused on designing a control system architecture and control method to ensure that the control is done appropriately from the perspective that the vehicle control system, which is the top-level controller, views the subsystem as the object of control. The sub-control modules of the vehicle control system were constituted and the functional elements of each module were defined to enable organic cooperative control between the control objects through architectural design and verification according to the V-Process. This is expected to improve the productivity and quality of more diverse and complex electric two-wheeler systems.