• 대한전기학회논문지:시스템및제어부문D
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• 제53권9호
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• pp.638-643
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• 2004

Middleware enables different networking devices and protocols to inter-operate in ubiquitous home network environments. The UPnP(Universal Plug and Play) middleware, which runs on a PC and is based on the IPv4 protocol, has attracted much interest in the field of home network research since it has versatility The UPnP, however, cannot be easily accessed via the public Internet since the UPnP devices that provide services and the Control Points that control the devices are configured with non-routable local private or Auto IP networks. The critical question is how to access UPnP network via the public Internet. The purpose of this paper is to deal with the non-routability problem in local private and Auto IP networks by improving the conventional Control Point used in UPnP middleware-based home networks. For this purpose, this paper proposes an improved Control Point for accessing and controlling the home network from remote sites via the public Internet, by adding a web server to the conventional Control Point. The improved Control Point is implemented in an embedded GNU/Linux system running on an ARM9 platform. Also this paper implements the security of the home network system based on the UPnP (Universal Plug and Play), adding VPN (Virtual Private Network) router that uses the IPsec to the home network system which is consisted of the ARM9 and the Embedded Linux.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.272-279
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• 2007

Recently, train control system is adopting computer system replacing mechanical system and its software is taking more responsibility than ever. Train control system software is a safety-critical embedded software with realtime and high reliability requirements. In this paper, we propose a safety assessment method for the train control system software. We review characteristics of train control system software and analyze related international software safety standards to derive requirements for safety assessment. Testing tools used for embedded software are surveyed to find a feasible safety assessment architecture. The proposed safety assessment method is to use safety activity results generated during development processes and feed them to the runtime embedded software testing tool.

• 대한임베디드공학회논문지
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• 제14권6호
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• pp.339-346
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• 2019

Multi-axis servo systems are widely used in various fields such as industiral systems for improving production efficiency, robotics and complex systems where many mechanical devices and sensor systems are connected. Such a servo system requires that the servo control technique to realize the synchronization of the drive shaft in the steady state and transient conditions and to control so as to follow the target track in order to improve product precision and production efficiency. In addition, embedded type hardware is required for smooth control of the entire multi-axis system. Therefore, this paper uses hardware based on FPGA which is widely used in digital signal processing field and various control system because hardware design change is easy and parallel processing is possible. In addition, Labview based servo motor control program was studied that can control the servo motor by ensuring the performance and flexibility of the FPGA and follow the target trajectory according to various speed processing and accurate timing synchronization.

• 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.

• Journal of Advanced Marine Engineering and Technology
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• 제40권1호
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• pp.55-61
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• 2016

임베디드 PC의 가격 대 성능비가 좋아짐에 따라 PC-Fi를 위한 임베디드 시스템을 설계함으로써 PC-Fi의 장점을 극대화할 수 있다. 본 연구에서는 스마트폰 또는 태블릿 등의 모바일 기기를 원격제어기로 사용할 수 있는 임베디드 PC-Fi를 구성한 다음, 이 원격 제어기의 GUI를 통해 자유롭게 선곡하고 음악재생을 제어할 수 있게 하는 인터렉티브 원격제어 시스템을 설계한다. 이러한 PC-Fi 시스템에 많은 양의 음원이 보관되어 있는 상황을 가정할 때, 사용자가 원하는 음악을 쉽고 편리하게 선택할 수 있게 하는 기능은 PC-Fi의 장점을 살리는 데 중요한 역할을 한다. 이 기능을 구현하기 위해 본 연구에서는 임베디드 시스템에 보관되어 있는 음원 각각에 대한 정보를 음원정보 DB에 저장해 두고 사용자가 입력하는 키워드를 바탕으로 원하는 음원을 쉽게 찾을 수 있게 하는 방안을 제안한다. 임베디드 PC-Fi와 원격제어기는 wifi 통신망으로 상호 연결되며, 다수의 사용자가 각각 자신의 모바일 기기로 임베디드 시스템을 원격제어 할 수 있게 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 D
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• pp.2429-2431
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• 2004

In this paper, we have designed a remote controlable HDR System using all embedded linux board. The system is composed of three parts - a HDR System, a PC client program for remote control and a Nameserver for registering and aquisition of the IP address. The system is built in an embedded board using a linux kernel. With the Linux the system can support networking and file system for a hard disk management In addition, the system embeds a web-server and a ftp-server for remote manipulation and file transfer. And the hardwares of the system are controlled by the linux device driver mechanism. MPEG1/2 technique is used to compress TV tuner signal and external analog video/audio signal. And compressed data is stored in a hard disk. The data stored in the system is accesable through lan or internet. And RTP protocol is used to enable the system to service live stream of instant video/audio input.

• 한국컴퓨터산업학회논문지
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• 제5권9호
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• pp.883-890
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• 2004

본 논문에서는 임베디드 시스템을 응용하여 인터넷으로 기기들을 원격으로 제어하는 장치를 개발한다. 이극 위하여 임베디드 디바이스 서버를 이용한 원격인터페이스 장치와, 이 장치륵 이용한 원격 제어 방법을 설계하고, 임베디드 인터넷 원격 제어를 위한 PC 프로그램을 개발을 설명한다. 개발된 장치는 집 안팎에서 출입구나 전등, 가전제품 등을 제어할 수 있는 홈 오토메이션이나 기타 인터넷을 이용한 산업용 원격 제어에 다양하게 이용가능하다. 또 논문에 서는 수 십 개의 모터를 동시에 제어할 수 있는 장치에 응용 예를 보인다.

• 제어로봇시스템학회논문지
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• 제13권12호
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• pp.1160-1166
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• 2007

This paper presents the design and implementation of an embedded image stabilization control system for a mobile phone with a built-in camera. Image stabilization is a family of techniques for reducing image blur resulting from minute camera shake due to hand-held shooting, thereby allowing the use of shutter speeds slower than values normally required to obtain sharp images. A mechanical image stabilizer mechanism developed for a camera mobile phone is introduced and a digital control system as a part of the image stabilization system is designed and implemented on an 8-bit microcontroller with integer arithmetic in C. This paper focuses primarily on issues that need to be taken into consideration for fixed-point implementation of the digital controller. Several experimental results are presented to demonstrate the performance of the implemented image stabilization control system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.2693-2695
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• 2005

In this paper, we developed a more efficient system for the remote control and monitoring of a wheeled mobile robot using internet without spatial limitation. The hardware configuration of the remote control system for a wheeled mobile robot includes a client PC executed on the remote site, a embedded web-server and a mobile robot with many measuring equipments. The communication between a client PC and a embedded web-server is implemented through internet. And the Bluetooth module is used for connecting a embedded web-server and a mobile robot. A GUI program has been developed by using JavaScript in order to easily control a mobile robot on a client PC.

• 대한임베디드공학회논문지
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• 제15권2호
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• pp.95-101
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• 2020

In situations where mobile robots are operated either by autonomous systems or human operators, such as smart factories, priority-based teleoperation is crucial for the multiple operators with different priority to take over the right of the robot control without conflict. This paper proposes a priority-based teleoperation system for multiple operators to control the robots. This paper also introduces an efficient joystick-based robot control command generation algorithm for differential-drive mobile robots. The proposed system is implemented with ROS (Robot Operating System) and embedded control boards, and is applied to Pioneer 3AT mobile robot platform. The experimental results demonstrate the effectiveness of the proposed joystick control command algorithm and the priority-based control input selection.