• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.1
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• pp.166-171
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• 2003

This paper presents the algorithms and Matlab Toolbox for co-simulation of distributed real-time control system based on OSEK-OS and CAN protocol. This toolbox enables the developers to analyze the timing uncertainty, which is caused by resource sharing including shared memories and networks, and to take the timing uncertainty into consideration in the early design phase. Furthermore, this toolbox helps the developers to model the behaviors of a control system by providing graphical user interface for objects of OSEK-OS and CAN. To prove the feasibility of this toolbox, a vehicle body network system is modeled with this toolbox, and the timing uncertainties are analyzed.

• Proceedings of the KIEE Conference
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• 2005.05a
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• pp.188-190
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• 2005

In this study, a smart motor control and monitoring system is developed with an embedded board where Intel PXA255B CPU is mounted. Linux is ported into the embedded board as RTOS(Real Time Operating System), and the environment which communicate with a motor driver through serial protocol and is capable of controlling and monitoring the motor in real time is built in the system. A user friendly GUI is developed for the convenient operation of the system. Also, the environment which is able to control and monitor the motor driver remotely is built in the system using TCP/IP protocol.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.01a
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• pp.33-36
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• 2012

디지털 컨버젼스 시대가 도래하면서 자원이 제한된 소형기기들의 사용이 비약적으로 증가하는 추세이다. 실시간 운영체제가 탑재되는 임베디드 시스템은 특성상 제한된 메모리를 가지기 때문에 제한된 메모리를 효율적으로 사용할 수 있는 기법이 적용되어야 한다. 이러한 제한된 메모리 관리를 효율적으로 사용하도록 기존의 CNU_RTOS에서는 실시간 운영체제의 메모리 관리 기법인 메모리 풀(Pool)과 힙(Heap) 알고리즘을 사용하였다. 시간 결정성을 보장하기 위해 힙을 할당하는 방법으로 first fit 알고리즘을 사용하였지만 외부 단편화로 인한 메모리 낭비를 감수하게 되었다. 본 논문에서는 힙 스토리지 매니저에서 발생하는 외부 단편화를 최소화하기 위해 버디 시스템을 이용한 메모리 관리 기법을 설계 및 구현하였다.

• Journal of the Korean Association of Geographic Information Studies
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• v.8 no.1
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• pp.63-74
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• 2005

The telematics device, which is a typical embedded system on the transportation or vehicle, requires the embedded spatial DBMS based on RTOS (Real Time Operating System) for processing the huge spatial data in real time. This spatial DBMS can be developed very easily by SQL3 functions of the ORDBMS such as UDT (user-defined type) and UDF (user-defined function). However, developing index suitable for the embedded spatial DBMS is very difficult. This is due to the fact that there is no built-in SQL3 functions to construct spatial indexes. In this study, we compare and analyze both Generalized Search Tree and Relational Indexing methods which are suggested as common ways of developing User-Defined Indexes nowadays. Two implementations of R-Tree based on each method were done and region query performance test results were evaluated for suggesting a suitable indexing method of an embedded spatial DBMS, especially for telematics devices.

• The KIPS Transactions:PartD
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• v.15D no.3
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• pp.355-360
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• 2008

The complicated embedded system for multi-tasking requires RTOS(real-time operating system). It uses the optimal OS and processor to each embedded system on the heterogeneous development environment. This paper is proposed to use UML profile of OS API and Processor Configuration, instead of cross-compiling for developing the heterogeneous embedded system. This reduces the development time and cost through generating the automatic source code with the profile information of each embedded system. We generate and port the code after modeling the two heterogeneous real time operating systems (brickOS and uC/OS-II) and the processors (Hitachi H8 and Intel PXA255) with our proposed profile of the heterogeneous embedded system.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.142-144
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• 2003

임베디드 시스템에 대한 관심과 개발이 급속도로 진행됨에 따라 임베디드 시스템에서도 파일 시스템을 필요로 하게 되었다. 특히 실시간 운영체제 (Real Time Operating System : RTOS)를 사용하는 경우에는 운영체제가 사용되는 임베디드 시스템에 따라 필요로 하는 파일 시스템이 하나 또는 그 이상으로 다르게 되어 그 파일시스템을 통합하여 관리하기 위한 가상 파일 시스템 (Virtual File System : VFS)을 필요로 하게 되었다. 본 논문에서는 실시간 운영체제와 함께 동작을 하는 가상 파일 시스템을 구현하는 방법을 제시한다.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.555-559
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• 2008

According to the development of the embedded system, a java technology which has a various platform has developed rapidly on the embedded device. CVM(Classic Virtual Machine) which is defined in the CDC(Connected Device Configuration) of the SUN mircosystems provides a java environment that is independent of a platform. Specially, embedded devices like a set-top box or a smart phone can be implemented by using FP(Foundation Profile) in CDC for a network faculty. In this paper, we design and implement native methods of FP which are network's API for implementation of CVM network on Real-Time Operating System iRTOS.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.3
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• pp.547-553
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• 2004

Linux is the one of various RTOS, also embedded linux has being studied with focus on technical stability and commercial utilities. In this paper, the technical trial was discussed on the development of real-time operating system that provides real time capability and extends the network communications ability and would be applied to the maritime mobile communication system through analysis the embedded linux kernel. Some techniques for Analyzing the embedded linux kernel and designing the target board, making the kernel image and porting the kernel are summarized in this paper.

• The KIPS Transactions:PartD
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• v.9D no.4
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• pp.677-686
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• 2002

Recently, the Open-Development-Tool-Environment becomes a basic requirement of RTOS (Real Time Operating System) for embedded systems with restricted memory and CPU power in order to develop applications effectively. A remote interactive shell is one of the basic software components which makes users develop, test and control softwares without burdening target systems. In this paper, we have implemented the remote interactive shell with the following functions : loading object modules, spawning and manipulating tasks facilities thru a remote host. Comparing information reference methods with nonredundant overhead, we have achieved the system with easy maintenance. The shell has been developed with Q-PLUS RTOS under ARM EBSA285 target board and NT host.

• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.1
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• pp.52-57
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• 2014

This paper presents an implementation of a smooth path planning method considering physical limits on a real time operating system for a two-wheel mobile robot. A Bezier curve is utilized to make a smooth path considering a robot's position and direction angle through the defined path. A convolution operator is used to generate the center velocity trajectory to travel the distance of the planned path while satisfying the physical limits. The joint space velocity is computed to drive the two-wheel mobile robot from the center velocity. Trajectory planning, velocity command according to the planned trajectory, and monitoring of encoder data are implemented with a multi-tasking system. And the synchronization of tasks is performed with a real-time mechanism of Event Flag. A real time system with multi-tasks is implemented and the result is compared with a non-real-time system in terms of path tracking to the designed path. The result shows the usefulness of a real-time multi-tasking system to the control system which requires real-time features.