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사물인터넷 디바이스를 위한 DNS 네임 자동설정의 설계 및 구현
이세준(Sejun Lee),정재훈(Jaehoon Jeong) 한국정보과학회 2015 정보과학회논문지 Vol.42 No.11
최근 가장 주목받고 있는 연구 분야 중 하나인 사물인터넷(Internet of Things, IoT)은 네트워크에 연결된 매우 많은 디바이스를 통해 사용자에게 다양한 서비스를 제공하는 것을 목표로 한다. IoT 환경에서 IoT 디바이스는 매우 많은 개수가 사용되는데 각 IoT 디바이스에 대한 DNS(Domain Name System) 네임을 일일이 수동으로 설정하는 것은 비효율적이다. 따라서 본 논문에서는 IPv6 기반의 IoT 환경에서 IoT 디바이스의 DNS 네임을 자동으로 생성하고 관리하는 DNS Name Autoconfiguration (DNSNA)이라는 기법을 제안한다. DNS 네임을 생성 및 등록하는 과정에서 Internet Engineering Task Force(IETF)에서 재정된 표준 프로토콜을 이용한다. 본 기법은 유니캐스트로 DNS 서버를 통해 IoT 디바이스의 DNS 네임을 IPv6 주소로 레졸루션(Resolution)하기 때문에 멀티링크 네트워크 환경에서는 기존의 멀티캐스트 기반의 mDNS(Multicast DNS) 기법보다 트래픽을 적게 발생시킨다. 따라서 본 기법은 멀티홉으로 구성된 IoT 네트워크에서 mDNS 보다 더 적합하다. 본 논문은 제안한 기법의 디자인과 스마트홈과 스마트 로드에서의 서비스 시나리오를 설명한다. 또한 본 논문은 스마트 그리드 환경에서 구현 및 테스트에 대하여 설명한다. As one of the most spotlighted research areas, these days, the Internet of Things (IoT) aims to provide users with various services through many devices. Since there exist so many devices in IoT environments, it is inefficient to manually configure the domain name system (DNS) names of such devices. Thus, for IPv6-based IoT environments, this paper proposes a scheme called the DNS Name Autoconfiguration (DNSNA) that autoconfigures an IoT device’s DNS name and manages it. In the procedure for generating and registering an IoT device’s DNS name, the standard protocols of the Internet Engineering Task Force (IETF) are used. Since the proposed scheme resolves an IoT device’s DNS name into an IPv6 address in unicast through a DNS server, it generates less traffic than multicast-based mDNS (Multicast DNS) which is a legacy DNS application for the DNS name service in the smart home. Thus, the proposed scheme is more appropriate in multi-hop IoT networks than mDNS. This paper explains the design of the proposed scheme and its service scenarios, such as smart home and smart road. It also explains the implementation and testing of the proposed scheme in the smart grid.
피에조 인젝터 커먼레일 시스템을 이용한 DME 분사 시 분위기 조건 변화에 따른 분무특성에 관한 연구
이세준(Sejun Lee),양지웅(Jiwong Yang),임옥택(Ocktaeck Lim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
To understand DME characteristics including spray penetration length and spray angle at a real engine ambient condition, DME was injected into a high pressure chamber by a piezo injector common rail system. The pre-mixed gas combustion used N₂, O₂, and C₂H₂ was occurred in the high pressure chamber to modify the engine being operated. The piezo injector common rail system was applied to get steady injection pressure and rapid responsibility. Injection pressure was also varied to check a relation with spray characteristics. Using a direct photographing technique with high speed camera, every DME spray was able to be imaged. In the high pressure chamber, when temperature and pressure were increased, the DME spray penetration length was decreased since evaporation effect of DME was risen by high temperature. In addition, DME spray penetration velocity was drop by high pressure condition which was high density of a pre-mixed combustion gas. In contrast, while the temperature and pressure were decreased the penetration length was elongated and penetration velocity was faster relatively. When DME injection pressure was increased, there was no effect of penetration length but penetration velocity was increased while spray angle was enlarged.
인젝터 노즐 홀 직경의 변화에 따른 DME 커먼레일 연료 분사 시스템의 분무 특성에 관한 연구Ⅱ
이세준(Sejun Lee),김상일(Sangill Kim),임옥택(Ocktaeck Lim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
DME spray characteristics were investigated about varied ambient pressure and fuel injection pressure using the DME common rail fuel injection system when the nozzle holes diameter is varied. The common rail fuel injection system with DME cooling system was used since DME has properties of compressibility and vaporization in atmospheric temperature. The fuel injection quantity and spray characteristics were measured. The spray analysis parameters were spray shape, penetration length, and spray angle at six nozzle holes. Three types of injector were used, the nozzle holes diameter were 0.166, 0.250, and 0.300㎜. The fuel injection pressure was varied by 5㎫ from 35 to 70㎫ when the ambient pressure was varied 0, 2.5, and 5㎫. When using the 0.300㎜ injector in comparison to the others, the DME injection quantity was increased 1.69 ~ 2.02 times. Through this, it had the similar low heat value with diesel which was injected 0.166㎜ injector. In case of 0.250 and 0.300㎜ injectors, there were assymmetrical spray shapes at initial time. However as time goes by, the spray shape was symmetrical. Among three types of injector, the 0.300mm injector had the fastest development velocity of penetration length. In case of spray angle, the 0.250㎜ injector had the largest spray angle. Through these results, only the way enlargement the nozzle holes diameter is not the solution of DME low heat value problem.
고정 카메라 기반 비디오 모니터링 환경에서 GMM을 활용한 움직인 돼지 탐지
이세준 ( Sejun Lee ),유승현 ( Seunghyun Yu ),손승욱 ( Seungwook Son ),정용화 ( Yongwha Chung ),박대희 ( Daihee Park ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.2
고정 카메라 환경에서 움직이는 객체만을 탐지하는 것은 비디오 모니터링의 중요한 응용 분야이다. 본 논문에서는 비디오의 특성인 움직임 정보가 포함된 영상에서 GMM을 이용하여 움직인 돼지와 움직이지 않은 돼지의 위치를 대략적으로 구분하고, 추가적인 영상 처리 기법과 딥러닝 기반 객체 탐지기를 적용한 박스 단위 객체 탐지 결과를 활용하여 움직인 돼지의 외곽선을 보정한다. 돈사에서 촬영된 비디오 데이터로 실험한 결과, 제안 방법은 효과적으로 움직인 돼지를 탐지할 수 있음을 확인하였다.