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추성호(Seongho Choo),이충환(Choong-Hwan Yi) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
This paper is for a Real-time Active Control System to operate a boiler. By sensing of flame we wanted to get status of a furnace as many as possible, like load, efficiency, and/or amount of pollutant. These data can be used to make optimal running point by controlling the ratio of air and fuel. So the last object is to make a closed actual control loop from optical head to valve controllers. The first job was to design and to develop a optical data acquisition system. including optical sensor module. And we gathered flame data in variable situations for taking the trend of flame against burning environment. Currently we are developing a general system model, designing some control strategy and testing this active control system.
화염 라디칼 계측을 이용한 보일러의 실시간 능동 제어 시스템
추성호(Seongho Choo),이충환(Choong-Hwan Yi),신명철(Myung-Chul Shin),김세원(Se-Won Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
We have constructed a real-time active control system using a optical measurement for a middle or large size boiler system, perfomed experiments on a 40,000 ㎉/h furnace. This system is applying some radical information from the combution light as focusing wavelengths on CH, C2, and OH, so can intend more efficent with low pollution. In this paper, we show the system organization included a optic head, PMT sensors, a data acquisition system, a main control unit, a real-time control and data analysis program, and some valve actuators for the closed active control loop. And show chemiluminescence data on variable ratio of fuel and air. Being developed boiler system is performing on using gas, oil with or without reburn fuel. On this composite control system, we made efforts to find a more optimal control algorithm for high efficency with low pollutant emission like NOx.
강성호(Seongho Kang),이상진(Sanggin Lee),추영열(Young-yeol Choo) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.4
Quay cranes are considered core equipment for container terminal operation. However, unmanned operation systems have not as yet been announced due to the technological difficulties of implementation. In this paper, we developed a wireless controller to control a quay crane simulator remotely and conducted its performance test, a first step toward unmanned operation of quay cranes. The communication delay of a developed wireless controller was about 9.4ms on average while that of existing wired controllers was about 5.6ms. The same functions were implemented and tested on a smart phone where the average communication delay was 7.3ms. In addition, to apply the developed system into a real environment, we proposed a network architecture based on IEEE 802.11ac and carried out its performance evaluation. When the distance between two nodes was 50m apart, the throughputs of the TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) were 57Mbps and 189Mbps, respectively. The communication delay of the control data was 9.1ms through the TCP channel. These results reveal the proper working of remote quay crane operation if we adopt the IEEE 802.11ac network.
Active Type Localization Scheme for Automatic Landing of Unmanned Helicopters
Young-yeol Choo,Daun Jung,Juneui Hong,Seongho Kang 한국멀티미디어학회 2010 한국멀티미디어학회 국제학술대회 Vol.2010 No.-
This paper describes a location tracking system to guide landing process of an Unmanned Helicopter (UMH) exploiting MIT Cricket nodes. The Cricket system operates in passive mode in that a listener attached to a moving device receives distance signals from several beacons located at fixed points on ground. Inevitably, this passive type of implementation causes large disturbances in measuring distances between beacons and the listener due to wind blow from propeller and turbulence of UMH body. To cope with this problem, we proposed active type of implementation for positioning a UMH. In this implementation, a beacon is set up at UMH body and four listeners are located at target ground position. A pair of Ultrasonic and RF signals from the beacon arrives at several listeners to calculate the position of the UMH. The distance signals among listeners are synchronized with a counter value appended to each distance signals from the beacon.