• Journal of the Korean Society of Propulsion Engineers
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• v.8 no.3
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• pp.27-36
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• 2004

This paper has been conducted to design for pressure regulation system. to simulate for performance of turbo pump unit using AMESim(Advanced Modeling Environment for Simulation of Engineering Systems). With optimized of system, pressure regulation system has been confirmed dynamic characteristics of transient and steady states range based on static modeling of open type turbo pump fed engine system. These results can be utilized to verify for performance test facility of propulsion control system for analysis on control valves, review of the fundamental principle on the control logic and certificating engine feeding system.

• Journal of the Korea Convergence Society
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• v.1 no.1
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• pp.17-21
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• 2010

This paper proposes a mechanism for managing overload in real-time web service system. The many previous mechanisms manage overload with controlling web request. These mechanisms can control only new web request. They don't have any control existing tasks, especially periodic tasks. We design a controller that able to meet real-time performance with controlling even periodic tasks. A feedback control system is implemented applying the proposed mechanism. And we verified the stable operation of system.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.485-486
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• 2013

본 논문에서는 저가형 플라이백 컨버터를 이용한 태양광 전력조절기의 연속도통모드(CCM) 제어기 설계를 제안한다. PV 전압 제어기 설계를 위하여 소신호 분석을 통해 전달함수를 유도하고 보상기를 설계하여 전압루프를 안정하게 설계하였다. 설계 결과는 MATLAB과 PSIM 시뮬레이션 비교로 검증하였다. 최종적으로 최대전력 조절제어를 위한 최대전력추종제어기를 구현하여 하드웨어로 검증하였다.

• Journal of Bio-Environment Control
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• v.6 no.4
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• pp.242-249
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• 1997

Environmental control operations have been considerably contributed to the reduction of labor cost in both plastic film and glass greenhouses since government supported projects were begun. However, some problems are still remaining on the optimal environmental control and excessive operation due to an inflexible software regulating ventilation gear - reducers. The unadjustable software caused the damage of ventilation system, resulting in heat stresses of crops. This study was performed to develop a ventilation software controlling the vent opening level, opening sequence, based on the wind direction, and control interval according to the difference between ambient and set- up temperatures. The software included a beeper system alarming urgent cases, while a manager was remote from the greenhouse. A compatible hardware with the software was also developed by using a low-cost diffused DSP controller.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2001.11a
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• pp.172-173
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• 2001

기내 환경과 소식물체의 생육간 관계를 분석하기 위해서는 정밀 환경 제어가 가능한 시스템이 요구된다. 본 연구에서는 CO₂, PPFD, RH등의 환경 제어 시스템을 개발하고 본 시스템 내에서의 소식물체 생육 특성을 분석하고자 하였다. 본 시스템은 총 5개의 챔버를 부착하여 외부 환경과 밀폐된 조건을 구현하고 독립적으로 제어 가능하도록 설계하였으며, 환경 제어 알고리즘을 완성하였다. (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1995.04a
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• pp.53-54
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• 1995

식물공장의 생육환경 제어는 작물의 생장 프로세스에 대한 지식을 이용하여 시설 내부의 환경요인을 경제적 최적 상태로 구현하는 것으로, 이를 위해서는 작물 생장에 대한 생물학적 관점과 환경제어 시스템에 관련된 공학적 관점, 그리고 수확된 작물과 에너지 투입에 대한 경제적 관점이 동시에 고려되어야 한다. 본 연구는 식물공장의 지상부 환경에 대한 작물의 생장 모델과 환경제어에 소요되는 에너지 투입 모델을 바탕으로 하여, 효율적인 생육환경 제어 알고리즘을 개발하려는 목적에서 수행되었으며 그 과정 및 결과를 요약하면 다음과 같다. (중략)

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.4
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• pp.560-565
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• 2020

Korea's seaweed is using a method that is not suitable for the automated process and quality are significantly lower than the export volume of 20,000 tons or more. Therefore, in this paper, we improved the existing dry steaming weight control device and electronicized the remote control system and the existing dry steaming weight control device. This is implemented with precise and detailed device, unlike the dry seaweed weight control method using the conventional valve which depends on the user's feeling and experience. Also, because it is a remote control system, it can help to produce seaweed safely even if you don't climb on the machine. The Seaweed weight control device implemented is expected to contribute greatly to the automation process and industrial growth of the steeply growing dry laver production and export industry.

• The KIPS Transactions:PartA
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• v.10A no.6
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• pp.615-626
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• 2003

This paper proposes a mechanism for managing overload Introduced by excessive web requests in real-time web service system. The many previous mechanisms statically manage the overload and thus the dynamic characteristics are not reflected. This paper proposes a mechanism that models system load based on control theory approach and includes its dynamic characteristics. We design a controller that is able to meet performance requirement. A feedback control system is implemented applying the proposed mechanism and the stable operation of system is verified through various simulation environments.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2355-2357
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• 2003

비선형성을 가지는 실제 플랜트의 제어기를 설계하기 위해서는 플랜트와 외부환경에 대한 충분한 정보를 필요로 한다. 그러나, 제어기 설계 시에는 실제 플랜트의 수학적 해석의 어려움, 모델링 오차와 외란 등의 원인으로 고려해야 할 복잡한 사항들이 있다. 이를 해결 하기 위한 기존 연구로는 플랜트에 대한 시스템 식별과 선형화를 통하여 공칭모델을 선정하고, 이를 제어하는 Model-based 방법과 모델이 아닌 실제 플랜트의 입출력 데이터를 토대로 제어기의 게인들을 반복 조절하는 Model-free 방법 등이 있다. 본 논문에서는 Model-free 방법 중에 하나인 반복 게인 조절 알고리즘을 기반으로 이 방법의 단점인 수렴속도지연을 보상하기 위한 목적으로 Model-based 방법 중에 하나인 외란 관측기(Disturbance Observer)를 결합한 새로운 제어 알고리즘을 제안하고, ODD(Optical Disk Drive)에서 사용되는 플 랜트에 적용한 모의 실험을 통하여 그 유용성을 보였다.

• Journal of the Korean Society of Hazard Mitigation
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• v.4 no.1 s.12
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• pp.33-40
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• 2004

The objective of this study is to develop single dam operation models for flood control using Fuzzy control technique, which can improve flood controllability. We set control rules by water level and inflow, and developed three models Fuzzy I, II, III according to rule to decide outflow. Fuzzy I model consists of six rules considering only flood control and Fuzzy II model considers the effect of water use by increasing water level at the end of flood control period as well as flood control during the same period. Finally, Fuzzy m is an adaptive model designed to perform multipurpose dam operation for both flood control and water use simultaneously based on a control rules.