• Journal of Institute of Control, Robotics and Systems
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• v.11 no.1
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• pp.84-91
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• 2005

In this paper, we describe the real-time parallel processing simulator developed for the use of performance analysis of rolling missiles. The real-time parallel processing simulator developed here consists of seeker emulator generating infrared image signal on aircraft, real-time computer, host computer, system unit, and actual equipments such as auto-pilot processor and seeker processor. Software is developed from mathematic models, 6 degree-of-freedom module, aerodynamic module which are resided in real-time computer, and graphic user interface program resided in host computer. The real-time computer consists of six TIC-40 processors connected in parallel. The seeker emulator is designed by using analog circuits coupled with mechanical equipments. The system unit provides interface function to match impedance between the components and processes very small electrical signals. Also real launch unit of missiles is interfaced to simulator through system unit. In order to apply the real-time parallel processing simulator to performance analysis equipment of rolling missiles it is essential to perform the performance verification test of simulator.

• Journal of Institute of Control, Robotics and Systems
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• v.21 no.3
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• pp.187-193
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• 2015

When developing a vehicle control system, simulation methods are widely used to validate the whole system in the early development phase. With this regard, the simulator should correctly behave just like the real parts that are not yet implemented while interacting with already implemented parts in real-time. However, most simulators cannot provide functionally and temporally accurate behaviors of the target system. In order to overcome this limitation, this paper proposes a novel real-time simulation technique that can efficiently simulate the temporal behavior as well as the functional behavior of the simulation target system.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.438-440
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• 2004

Energy consumption has become an increasingly important consideration in designing real-time embedded systems. In this paper, we propose a voltage scaling method to reduce energy consumption in fixed priority real-time systems using variable voltage processors. The Hyperperiod of tasks is divided into dimains. The most suitable voltage of each domain is determined off-line and stored in a table. During task execution, the voltage of processor is adjusted according to the information of the table. A simulation result shows that the proposed method can reduce 80% of power consumption in comparison to no power management. The difference to the optimal EDF based method is only 5%.

• Journal of Institute of Control, Robotics and Systems
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• v.7 no.7
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• pp.567-573
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• 2001

A real-time HVAC system is proposed which implements real-time control of thermal environment for virtual reality. It consists of a pair of hot and cold loops that serve as thermal reservoirs, and a mixing box to mix hot and cold air streams flowing if from loops. Their flow rates are controlled in real-time to meet a set temperature and flow rate. A cascade control algorithm along with gain scheduling is applied to the system and test results shows that the closed-loop response approached set values within 3 to 4 seconds.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.11
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• pp.1434-1440
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• 1999

For the real-time power system analysis, there exists a limitation to the scale of the system to be simulated, hence it is necessary for the real-time simulation to develop reduced equivalent systems which preserve the desired property of the original system. In this paper, a procedure for developing an equivalent system whose scale is reduced within the hardware capacity of a real-time simulator is proposed. Also, the proposed procedure is applied to a KEPCO's system. The comparison between the original system and equivalent systems illustrates the capabilities of the proposed procedure.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.430-432
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• 2005

센서 네트워크를 구성하는 대부분의 센서 노드들은 제한된 용량의 배터리로부터 전력을 공급받는다. 그러한 센서 노드들의 수명은 장착된 배터리의 수명에 의해 결정되기 때문에 배터리의 수명을 최대화시키는 것이 센서 네트워크 응용 설계에서 중요한 고려 사항이 된다. 한편, 배터리는 전력 소모 패턴에 따라 전지가 제공할 수 있는 총 용량이 일정하지 않으며 방전이 진행됨에 따라서 비선형적인 특성을 보이기 때문에, 배터리의 수명은 연결된 로드의 특성에 따라서 항상 다르게 결정된다. 본 논문에서는 그러한 배터리의 방전 특성을 고려한 실시간 태스크 스케줄링 알고리즘을 제안한다. 실험을 통하여 얻은 결과는 제안된 배터리의 특성을 고려한 태스크 스케줄링 알고리즘이 그렇지 않은 태스크 스케줄링 알고리즘에 비해 배터리 수명을 향상시킴을 보인다.

• Proceedings of the KIEE Conference
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• 1998.11a
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• pp.217-219
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• 1998

The need to accommodate much complex algorithm. high communication functionality and easier user interface lays heavy burden on the software developer of the protection relay these days. Using lightweight real-time kernel like uC/OS, the software development process can have much structural and easier feature. And total cost needed to development and maintenance of the software also can be reduced by development based on these real-time kernels.

• Journal of the Korean Society for Railway
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• v.19 no.4
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• pp.445-455
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• 2016

A goal of the Real-time railway safety supervision system is to improve the safety oversight efficiency and to prevent accidents by integrating existing distributed monitoring systems, train, signal, power and facilities. So, the system require better performance regarding real-time processing based on big data. The disk-based database that is used in existing railway control systems has a problem with real-time processing; memory-based databases haves a limitation in terms of big-data processing; and time series databases haves a limitation in terms of real-time processing. So, we need a new database architecture for simultaneous real-time processing based on big data. In this study, we review the existing railway monitoring systems and propose a new database architecture for a real-time railway safety supervision system.

• 제어로봇시스템학회:학술대회논문집
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• 1995.10a
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• pp.476-479
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• 1995

A real time and adaptive method for obtaining Volterra kernels of a nonlinear system by use of pseudorandom M-sequences and correlation technique is proposed. The Volterra kernels are calculated real time and the obtained Volterra kernels becomes more accurate as time goes on. The simulation results show the effectiveness of this method for identifying time-varying nonlinear system.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.158-158
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• 2000

In this paper, control problems of computer kitchen systems are studied, which are widely used to automate test dyeing processes. To reduce the process time and avoid collision, a simplified real time control scheme Is proposed using Windows 98 environments Using two robots and applying proposed control scheme, the process time was reduced more than 30% for a given recipe in comparison with one robot machine