• 한국기계가공학회지
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• 제20권1호
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• pp.88-94
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• 2021

Currently, the Busan cooperative fish market follows a traditional market style. This study first investigates the current conditions and environment of the market, and to modernize the market, it proposes a new automatic unloading system based on the benchmark of Namhae Suhyup. In this system, a Korean-type suction fish vacuum pump is employed to increase the loading time. An automatic grader with an adjusting device for inclined angles and a weighing machine with an automatic alignment device are proposed. In addition, a folding machine is employed to prepare boxes. The specifications for each subsystem are provided. By implementing this system, the freshness of fish can be maintained and the sellers can earn more. This system can also be applied to the cooling system of the fish reservoir of littoral sea fishing boats.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1386-1391
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• 2004

It is known that an aircraft with delta-wings which are attached to the body at a large angle like a kite or a hang glider has a measure of maneuverability and stability. Aircrafts of this kind can fly stably. Even if engine trouble occurs, it will not fall and might be able to land. In this paper, one of the conventional control methods, PID control, is applied to the aircraft with LQ local control block. This is based on an idea that the aircraft flies so stably that the automatic control system might be realized by a simple controller. The proposed PID controller consists of several sub-controllers which are constructed to each system neglecting the interference. In addition, the LQ control is involved as a local loop of the aileron and rudder control in order to increase stability of the attitude when circling. The effectiveness of the proposed method is shown through 3D computer simulations and experiments of the flight path control.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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• pp.359-362
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• 2006

This study develops an automatic berthing control algorithm for ships with a bow thruster and a stern thruster as well as a rudder. A nonlinear mathematical model for low speed maneuvering of ships is used to develop a MIMO(multi-input multi-output) nonlinear control algorithm. The algorithm consists of two parts, which are forward velocity control and heading angle control. The control algorithm is designed based on the longitudinal and yaw dynamic models of ships. The desired heading angle is obtained by the so called "Line of Sight" method. An optimal control force allocation method of the rudder and the thrusters is suggested. The nonlinear control algorithms are tested by numerical simulations using MATLAB, and shows good tracking performances.

• 드라이브 ㆍ 컨트롤
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• 제14권2호
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• pp.9-15
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• 2017

The steering systems of all-terrain cranes have been developed with various control strategies for the stability and drivability. To optimally control the input steering angle, an accurate mathematical model that represents the actual crane dynamics is required. The derivation of an accurate mathematical model to optimally control the steering angle, however, is difficult since the steering-control strategy generally varies with the magnitude of the crane's longitudinal velocity, and the postures of the crane's working parts vary while it is being driven. To address this problem, this paper proposes an automatic steering-control algorithm that is based on the MPC (model predictive control) with a disturbance observer for all-terrain cranes. The designed disturbance observer of this study was used to estimate the error between the base steering model and the actual crane. A model predictive controller was used for the computation of the optimal steering angle, along with the use of the base steering model with an estimated uncertainty. Performance evaluations of the designed control algorithms were conducted based on a curved-path scenario in the Matlab/Simulink environment. The performance-evaluation results show a sound reference-path-tracking performance despite the large uncertainties.

• 한국컴퓨터정보학회논문지
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• 제4권2호
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• pp.46-60
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• 1999

최근들어 CTI(Computer Telephony Integration) 기술은 영상 회의, 파일 전송, 음성 사서함, 자동 메시지 전송, 자동 재다이얼 기능 등의 전통적인 분야에서부터 통합 메시징 및 네트워크 팩스 분야에 이르기까지 다양한 분야에 걸쳐서 활용되고 있다. 본 논문에서는 전화망을 이용한 CTI 응용분야로 대학에서 입시기간동안 수험생들의 전화 과중에 따른 업무와 학사 행정 서비스를 개선할 수 있는 CTI를 이용한 응용 시스템에 대하여 연구한다. 구현된 시스템은 최근 주목받고 있는 객체 모델링 기법(Object Modeling Technique)을 이용하여 데이터베이스를 설계하고, CTI 호출 제어 시스템을 이용하여 합격자 확인 자동 호출(Automatic Calling System), 합격자 발표 자동 안내(Automatic Response System) 등을 지원하도록 개발한다. 특히 합격자 자동 호출 시스템 구현시 합격 여부를 통지해 줄 때의 음성처리를 위하여 TTS(Text To speech) 모듈을 설계 구현한다.

• 전기저널
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• 10호통권106호
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• pp.22-27
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• 1985

• 대한전자공학회논문지TC
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• 제43권9호
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• pp.135-141
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• 2006

교통사고를 예방하기 위해서는 시트조정을 통해서 운전자의 시야를 확보하고, 운전자가 뒤에 오는 자동차를 알아 볼 수 있도록 룸미러의 위치를 조정하는 것이 매우 중요하다. 본 논문에서는 이러한 문제점을 해결하기 위해서, 안전하고 편리한 차량을 목표로 운전자가 차량에 앉게 되면, 자동으로 시트를 조정하여 운전자의 시야를 확보 할 수 있도록 한다. 또한 백미러를 자동 조정해서, 운전자가 안전운전에 도움이 될 수 있는 자동차 시트 자동 조정 알고리즘을 개발하였다. 특히, 교통사고 발생해서, 에어백이 작동 할 때에 본 논문에서는,승객의 몸무게에 따라서 충격완화를 위한 시트 자동조정 알고리즘을 기능을 추가하였다. 뿐만 아니라, 본 논문에서는, 교통사고 발생 시 운전자가 위험지역을 통과할 때 위험지역임을 운전자에게 통지하여 안전한 운전이 되도록 하는 알고리즘을 개발하였으며, 유비쿼터스 환경에서 모의실험을 하였다. 모의실험 결과 지능을 이용한 교통사고 분석 방식이기존의 방식보다 25% 이상 교통사고를 줄일 수 있음을 확인하였다

• 한국인터넷방송통신학회논문지
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• 제17권3호
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• pp.267-274
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• 2017

최근 농업 분야에 IT 기술이 결합되면서 농업자동화 시스템에 대해 많은 연구가 진행되고 있으며, 농작물의 생육환경을 자동으로 조절하는 시스템에 대한 연구도 이들 중 하나이다. 농작물의 병충해로 야기되는 피해를 방제하는 작업은 농민들의 미흡한 방제 효과에 대한 염려 때문에 수동방제나 반자동방제에 의해 수행되고 있다. 이러한 방식은 사람이 유해한 약물에 노출되거나 약제 과다 사용으로 인한 낭비 및 환경오염 등의 문제점이 있으므로 개선이 필요하다. 이러한 문제점을 해결하기 위해 농약제조회사에서 제시하고 있는 권장 농약 살포량을 기준으로 경작면적에 따른 방제량을 계산하여 정량 방제를 가능하게 하는 자동화정량방제시스템을 개발하였다. 개발된 자동화정량방제시스템의 효율성을 확인하기 위해서 수동방제 및 반자동방제의 경우와 비교하여 실험하였다. 실험을 통해서 자동화된 시스템이 약제의 과다 사용을 줄일 수 있었으며, 수동방제에 버금가는 방제효과를 얻어 기존의 방제작업을 대체 할 수 있음을 알 수 있었다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1997년도 하계 학술대회 논문집
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• pp.89-98
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• 1997

This study was conducted to develop an automatic nutrient-solution control system for small-scale growers. The nutrient-solution control system consisted of a low-cost and precise metering device and a personal computer. The system controlled electric conductivity(EC) and pH of nutrient-solution based on the time-based feedback control method with the information about temperature, EC, and pH of the nutrient-soIution. The performance of the nutrient-solution control system was evaluated through the control of EC and pH while compared with those of commercial nutrient-solution control system. Also an experimental cultivation of tomato was conducted to verify and to improve the developed system. Results of this study were as follows. 1. An automatic nutrient-solution control system based on a low-cost and precise metering device was developed. 2. The developed system controlled EC and pH within $\pm$0.05 mS/cm and $\pm$0.2 pH full scale error respectively at $24^{/circ}C$. 3. When using the commercial system, the controlled values of EC and pH of the 500l of water were 1.29 mS/cm and 6.1 pH for the setting points of 1.4 mS/cm and 6.0 pH respectively at $22^{/circ}C$. 4. The developed nutrient-solution control system showed $\pm$0.05 mS/cm of deviation from the setting EC value over the experimental cultivation period. 5. The deviation from the average values of Ca and Mg mass content in the several nutrient-solution were 0.5% and 1.8% respectively.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.3-9
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• 2008

Recently, the plant industries are being activated and plant control systems use various technologies. Because the optimized design for the plants is very important for the reducing of operation and maintenance costs, automatic control systems become more important. Plant control systems consist of the master controller, the plant networks, the programming environment for engineering, monitoring software and the field devices. The control systems should have reliability, availability and safety. Modular architecture of hardware and software makes flexible configuration of the control systems. Each component should have diagnostic functions. It follows industrial standards and makes open systems. Open systems increase accessibility against the data which is distributed in the plants. The controllers including processor and communication modules use the up-to-date technology. They have real time and fault tolerant function by duplicating processors or networks. It also enables to make the distributed control systems. The distributed architecture makes more scalable main control system. Automatic control systems can be operated with better performance. In this paper, we analyzed the requirements of the seawater desalination plants and made some consideration facts for developing the optimized controller. Also we described the design concept of the main controller, which consists of several modules. We should validate and complement the design for the reliability and better performance.