• 한국정보통신학회논문지
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• 제8권3호
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• pp.547-553
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• 2004

리눅스(Linux)는 여러 가지 실시간 운용체제의 하나로 기술개발이 적극 이루어지고 있으며, 내장형 RTOS로서 가능성과 기술적 안정성을 검증하는 연구가 진행되고 있다. 본 연구에서는 해상통신분야의 통신설비에 적용될 수 있는 내장형 실시간 운영체제의 분석과 기술개발을 통해 계측분야에서 요구되는 실시간 계측과 통신기능이 강화된 내장형 실시간 운영체제기술에 대해 정리하였다. 본 연구에서는 타켓보드를 설계하여 내장형 리눅스 커널(Embedded Linux Kernel)을 분석하고, 이를 포팅(Porting)하고 테스트 환경하에서 사용자 코드를 실행시켜 내장형 리눅스 커널을 기반으로 하는 소형 네트워크 제어기 응용 설계기술을 연구하였다.

• 제어로봇시스템학회논문지
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• 제12권2호
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• pp.194-200
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• 2006

The SoC and digital technology development recently enabled the emergence of information devices and control devices because the SoC presents many advantages such like lower power consumption, greater reliability, and lower cost. However, it is nearly impossible to use the SoC without operating systems because the SoC is included with many peripherals and complex architecture. It is required to use embedded operating systems and real-time operating systems may be used as an embedded operating system. So far, real-time operating systems are widely used to implement a Real-Time system since it meets developer's requirements. However, real-time operating systems have disadvantages including a lack of standards, expensive development, and license. Embedded Linux is able to overcome their disadvantages. In this paper, the implementation of control system platform for a mobile robot using real-time Embedded Linux is described. As a control hardware system platform, XScale board is used. As the real-time Embedded Linux, RTAI is adopted which is open source and royalty free, and supports various architectures and real-time devices, such like real-time CAN and real-time COM. This paper shows the implementation of RTAI on XScale board that means the porting procedure. We also applied the control system platform to the mobile robot and compared the Real-Time serial driver with non real-time serial driver. Experimental results show that that using RTAI is useful to build real-time control system with powerful functionalities of Linux.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 하계종합학술대회 논문집(2)
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• pp.407-410
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• 2004

This paper describes an embedded system to put a SoC actuator IP in motion and linux drivers. The If that a embedded linux among embedded OS is ported is implemented as linux driver. The actuator IP is controlled by application programming. To make users use this easily, a QT is ported on the system. Application program can operate the actuator IP device driver on TFT LCD.

• 한국멀티미디어학회논문지
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• 제7권8호
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• pp.1058-1065
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• 2004

단순 모니터에서 CPU, 메모리, 그리고 하드디스크를 갖춘 셋탑박스에 이르기까지 내장형 시스템은 다양한 응용에 사용되고 있다. 특히 휴대용 또는 소형기기에 멀티미디어를 서비스하는 경우가 증가하고 있고 이들 시스템에는 내장형 운영체제가 탑재되고 있다. 본 논문에서는 멀티미디어 서비스를 위한 내장형 리눅스가 탑재된 임베디드 시스템에서 응용 프로그램과 운영체제 커널사이의 메모리 복사 요구를 감소시키는 Null copy기법을 제안한다. 저성능의 컴퓨팅 파워 및 저용량의 메모리를 가진 내장형 시스템에서 연속 미디어를 네트워크를 통해 실시간으로 전송하고자 할 때 Null copy 기법은 시스템의 QoS를 만족시킬 수 있다. 웹 카메라를 내장형 리눅스 개발 보드에 장착하여 영상 전송 환경을 구축한 결과 Null copy 기법은 CPU 이용률 및 마감시간 실패측면에서 기존 커널에 비해 우수한 성능을 나타내었다.

• 제어로봇시스템학회논문지
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• 제10권5호
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• pp.428-433
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• 2004

In this paper, we developed a multi-protocol controller based on SoC and embedded Linux and applied it to integrate with BAS in a unified TCP/IP socket communication. The multi-protocol controller integrates control networks of RS-485 and LonWorks devices to BAS. The system consists of three-tier architecture, such as a BAS, a multi-protocol converter, and control devices. By using UML, we modeled the system architecture. In order to show the feasibility of system architecture, it was applied to a small BAS system. The experimental results show that the multi-protocol controller using embedded Linux is flexible and effective way to develop a building control system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.385-387
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• 2004

In this paper, we have designed a fingerprint cognition system based on the embedded Linux. The proposed algorithm in this paper use the wavelet transform to derive the special feature vector from the captured fingerprint and a probabilistic neural network is used to compare the feature vectors for the fingerprints. The system consists of server PC based on the Linux and the client based on the embedded Linux. The client is a Tynux box-x board using the PXA-255 CPU. For the acquisition of the fingerprint image, we use d the AS-S2 semiconductor sensor. The system is likely to be used to develop a police inspection system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.809-813
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• 2004

In this paper, we developed a network camera for CMOS camera module inspection. The design, implementation details including embedded linux porting and CPLD logics, and performance of network camera are described. The network camera consists of SoC(S3C4530A), CPLD and CMOS image sensor. In order to image data of CMOS image sensor we designed capture logics on CPLD by using VHDL program. Embedded Linux such as uClinux is performed on the network camera to utilize development environment and TCP/IP protocol specification. The application is based on socket communication between GUI on PC and Embedded Linux based network camera. When JPEG compression is applied, the transmission speed was improved enough for this system to be used for an alternative of expensive CCTV or remote monitoring system in a power plant and uninhabited places.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 춘계종합학술대회
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• pp.233-236
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• 2003

원격 모니터링 시스템 위한 실장형 리눅스 지능형 제어기를 구현한다. 실장형 리눅스 지능형 제어기의 하드 코어는 32비트 cpu로서 구성되었고 실시간 모니터링과 FFT을 수행 할 수 있도록 설계되었다. 그리고 모니터링 시스템은 자바에 의한 인터넷과 GUI 환경에서 수행되도록 설계되었다. 상세설계와 기능적 해석을 시스템 기반에서 수행되었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1550-1552
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• 2005

In this paper, we have designed a Fingerprint Recognition System based on the Embedded LINUX. The fingerprint is captured using the AS-S2 semiconductor sensor. To extract a feature vector we transform the image of the fingerprint into a column vector. The image is row-wise filtered with the low-pass filter of the Haar wavelet. The feature vectors of the different fingerprints are compared by computing with the probabilistic neural network the distance between the target feature vector and the stored feature vectors in advance. The system implemented consists of a server PC based on the LINUX and a client based on the Embedded LINUX. The client is a Tynux box-x board using a PXA-255 CPU. The algorithm is simple and fast in computing and comparing the fingerprints.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.184-186
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• 2007

Currently many sensors and processing data in a robot based on USN environments need to real-time features. In this paper, we examine recent research trends on real-time operating systems, especially on real-time embedded Linux, RTAI and Xenomai, for intelligent robots. Xenomai is a real-time development framework and have special feature supporting RTAI, VxWorks, pSOS+ etc. through the "skin". This research gives a guide to researcher in using real-time embedded Linux in the sense of architecture, supporting real-time mechanisms, kinds of real-time device driver, performances.