• 제어로봇시스템학회논문지
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• 제10권4호
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• pp.334-340
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• 2004

In this paper, a Web-based management system for the building network is described. A multi-protocol converter based on SoC and embedded Linux is designed. The open source licensing, reliability, and broad hardware support are key reasons for use of embedded Linux in embedded industry. The multi-protocol converter integrates control network of RS-485 and LonWorks devices through TCP/IP protocol for a client with Java applet. The system consists of three-tier architecture, such as a client, a server that is performed on a multi-protocol converter, and control devices. The developed system includes the inverter motor control system with modbus protocol for the RS-485 network. The experiment results show that the multi-protocol converter using embedded Linux is a flexible and effective way to builda Web -based monitoring and control system.

• 대한임베디드공학회논문지
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• 제12권4호
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• pp.239-246
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• 2017

Time synchronization between distributed embedded systems in the Real Time Locating System (RTLS) based on Time Difference of Arrival (TDOA) is one of the most important factors to consider in system design. Clock jitter error between each system causes many difficulties in maintaining such a time synchronization. In this paper, we implemented a system to synchronize clocks between FPGA based distributed embedded systems using the recovery clock of CDR (clock data recovery) used in high speed serial communication to solve the clock jitter error problem. It is experimentally confirmed that the cumulative time error that occurs when the synchronization is not performed through the synchronization logic using the CDR recovery clock can be completely eliminated.

• 한국정보시스템학회지:정보시스템연구
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• 제17권1호
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• pp.155-171
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• 2008

This thesis proposed a method that connecting step motor to image send board which can acquire image to move and remote controlling via streaming image board of PDA(personal digital assistant) based on embedded Linux which is using wireless network There are three embedded Linux system to embody movable image send board. First, though the wireless network a signal of PDA is transmitted to the board which has embedded Linux and a system which is controlled by the expansion I/O port of the board. Second, it's a system streaming realtime image at a PDA which has embedded Linux. The last is a system which controls a process of image board using TCP/IP communication and image send board at PC. These are the system which can use industrial settings and homes. It can also make use of an embodiment method about travelling image robot.

• 한국컴퓨터정보학회논문지
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• 제22권6호
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• pp.1-8
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• 2017

In this paper, we propose a fault tolerance technique which enables embedded systems to run without interruption while its operating system and tasks fail. In order to improve reliability, the proposed scheme makes an embedded system run as a virtual machine on virtual machine monitor. It also prepares a contingency virtual machine at which periodical backups of the embedded system are saved. When an error occurs in the main virtual machine, the corresponding standby virtual machine takes a role of the main virtual machine and continues its operation. Especially such backups and switches of virtual machines are performed with minor performance degradation by manipulating page table entries in virtual machine monitor. By conducting performance evaluation studies, we show that the proposed scheme makes embedded system robust against errors while it does not degrade the performance of the system significantly.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2019년도 추계학술발표대회
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• pp.80-83
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• 2019

지능형 로봇 기술은 더 나은 생활을 위한 현대 기술의 집약체이다. 산업, 생활, 정밀 기술 등 다양한 분야에서 응용이 가능한 확장성 넓은 분야이다. 해당 분야의 추적 기술은 LIDAR를 활용하는 방향으로 활발한 연구가 진행 중이다. LIDAR는 사방의 거리를 정확하게 측정할 수 있는 유용한 센서지만, LIDAR만으로는 로봇의 성능을 최대화할 수는 없다. 본 논문은 LIDAR 추적을 연장하여 Vision 기술의 융합에 관련하여 서술한다. Vision 기술의 융합을 통한 향상된 기능을 가지는 추적 로봇 설계 방법을 제안한다.

• 대한임베디드공학회논문지
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• 제7권5호
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• pp.227-239
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• 2012

Recent advances in electronics have enabled various conventional products to incorporate with numerous powerful microcontroller. Generally, an embedded system is a computer system designed for specific control functions within a larger system, often with real-time computing constraints. The growing performance and reliability of hardware components and the possibilities brought by various design method enabled implementing complex functions that improve the comport of the system's occupant as well as their safety. A cyber physical system (CPS) is a system featuring a tight combination of, and coordination between, the system's computational and physical elements. The concept of cyber physical system, including physical elements, cyber elements, and shared networks, has been introduced due to two general reasons: design flexibility and reliability. This paper presents a cyber physical system where system components are connected to a shared network, and control functions are divided into small tasks that are distributed over a number of embedded controllers with limited computing capacity. In order to demonstrate the effectiveness of cyber physical system, an unmanned forklift with autonomous obstacle avoidance ability is implemented and its performance is experimentally evaluated.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 추계학술대회
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• pp.458-461
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• 2011

조선 해양 분야에서도 IT와 연계되어 많은 서비스가 제공되고 있으며, 그 의존도 갈수록 다양화 고도화되고 있을 뿐 아니라, 안전성 및 신뢰성을 보장하는 고성능 임베디드 시스템의 요구가 증대되고 있다. 조선 및 해양 분야에 적용 가능한 임베디드 시스템으로는 선박식별시스템(AIS)과 같은 통신/제어를 위한 시스템과 전자해도표시시스템(ECDIS) 등과 같은 다양한 사용자 인터페이스와 사용자 인터페이스를 요구하는 서비스를 위한 시스템이 있다. 본고에서는 조선 해양용 임베디드 SW를 분류하고, 특정한 기능을 필요로 하는 통신/제어 장치용 저수준 임베디드 플랫폼과 다양한 사용자 인터페이스를 제공하여 항해자 편리성을 강조하는 ECDIS와 같은 서비스 응용 시스템을 위한 고수준 임베디드 플랫폼으로 분류하고, 각 플랫폼에 필요한 요소를 설명하고 개발 방향을 제시하고자 한다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제30권12호
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• pp.1149-1157
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• 2003

하드웨어와 소프트웨어가 조합된 내장형 시스템이 복잡해지면서, 내장형 시스템에 탑재되는 내장형 소프트웨어 테스트가 중요하게 인식되고 있다. 특히, 원자력 발전소와 같이 안전 등급이 높은 시스템에 들어가는 소프트웨어 테스트는 필수적이다. 내장형 시스템 테스트의 경우 하드웨어와 소프트웨어의 상호작용에 의해 발생하는 오류를 발견하기 위한 효과적인 테스트 기법이 필요하다. 본 논문에서는, 하드웨어와 소프트웨어 사이의 상호작용에 의해 생성되는 오류를 발견하기 위하여, 오류 삽입 기법을 이용한 테스트 데이타 선정 기법을 제안하고, 이 기법을 Digital Plant Protection System에 적용하였으며, 실험을 통해 제안한 기법의 우수성을 분석한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1405-1408
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• 2005

An embedded system has been applied to many fields including households and industrial sites. In the past, user interface products with simple functions were commercialized .but now user demands are increasing and the system has more various applicable fields due to a high penetration rate of the Internet. Therefore, the demand for embedded system is tend to rise In this paper, we Implementation of an embedded system for image tracking. This system is used a fixed IP for the reliable server operation on TCP/IP networks. A real time broadcasting of video image on the internet was developed by using an USB camera on the embedded Linux system. The digital camera is connected at the USB host port of the embedded board. all input images from the video camera is continuously stored as a compressed JPEG file in a directory at the Linux web-server. And each frame image data from web camera is compared for measurement of displacement Vector. That used Block matching algorithm and edge detection algorithm for past speed. And the displacement vector is used at pan/tilt motor control through RS232 serial cable. The embedded board utilized the S3C2410 MPU Which used the ARM 920T core form Samsung. The operating system was ported to embedded Linux kernel and mounted of root file system. And the stored images are sent to the client PC through the web browser. It used the network function of Linux and it developed a program with protocol of the TCP/IP.

• 한국ITS학회:학술대회논문집
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• 한국ITS학회 2003년도 제2회 정기총회 및 추계학술대회
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• pp.48-51
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• 2003