• 농업과학연구
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• 제48권3호
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• pp.597-606
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• 2021

Due to the characteristics of the farmland in Korea, forward and reverse shift is the most used. The fatigue of farmers is caused by forward and reverse shifting with a manual transmission. Therefore, it is necessary to improve the convenience of forward and backward shifting. This study was a basic study on the development of a current control system for forward and reverse shifting of agricultural tractors using proportional control valves and a controller. A test bench was fabricated to evaluate the current control accuracy of the control system, and the stability of the controller was evaluated through CPU (central processing unit) load measurements. A controller was selected to evaluate the stability of the proportional valve controller. The stability evaluation was performed by comparing and analyzing the command current of the controller and the actual current measured. The command current was measured using a CAN (controller area network) communication device and DAQ (data acquisition). The actual current was measured with a current probe and an oscilloscope. The control system and stability evaluation was performed by measuring the CPU load on the controller during control operations. The average load factor was 12.27%, and when 5 tasks were applied, it was shown to be 70.65%. This figure was lower than the CPU limit of 74.34%, when 5 tasks were applied and was judged to be a stable system.

• 제어로봇시스템학회논문지
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• 제10권3호
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• pp.261-266
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• 2004

Recently, a variety of intelligent robots are developed for the personal purpose beyond the industrial application. These intelligent robots have ranges of sensors, actuators, and control algorithms to their application. In this paper we propose a reconfigurable robot controller, $SR^2$c (The SOPC-based Reconfigurable Robot Controller), based on SOPC (System on a Programmable Chip), that can be reconfigurable easily by software. The proposed robot controller contains not only a processing module but also robot-specific IP's. To show a feasibility of the proposed robot controller, a small entertainment robot, Wizard-4 is implemented with a single chip controller as proposed in this paper.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 16-17 Oct. 1987
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• pp.413-418
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• 1987

The software developed for the large scale Programmable Controller consists of the programmer's S/W, the Controller's S/W the RBC's (Remote Base Controller's) S/W and the Analog's S/W. The programmer's S/W, running on the Programmer, includes the editor, the compiler, the communication program, and some other programs for easy use. The Controller S/W, which requires the fast scanning time, consists of the BTI( Block Type Instruction) solving program, the timer service routine, the i/o update program, the communication program and etc. The RBC's S/W includes the communication program, the error recovery program and the i/o processing program. The analog S/W, controlled by the Programmer, includes the PID program. The data communication between the Programmer and the Controller the Controller and the RBC, and the RBC and the Analog are developed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.930-933
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• 1988

This paper demonstrates an AI application for representing operator's heuristic knowledges in implementing process control. AI controller constitutes servo and regulatory controller, respectively. The knowledge base for servo controller was designed to obtain the process output with respect to the desired set-point in short period. The regulatory controller was to provide smooth output near the set-point. The AI controllers was implemented in Turbo-PROLOG on IBM-PC. For the parallel processing, Turbo-C was linked to calculate the process output. The result shows that this AI controller can be well suited not only for minimum phase but also for non-minimum phase. This controller may be used as a back-up controller for rather extensive expert system.

• 한국컴퓨터정보학회논문지
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• 제5권3호
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• pp.106-111
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• 2000

본 논문에서는 기존의 주파수 합성기 구현 방법인 DS, DDS, PLL방식을 조합시킴으로써 여러 가지 성능(전환시간, 안정성. 분해능)을 향상시킬 수 있는 주파수 합성기의 DCO 제어기를 설계하였는데, 이 DCO controller는 병렬처리 기법 및 신경망에서 사용하는 기법인 패턴매칭 기법을 사용하였다. 본 논문에서 설계된 DCO controller는 이동통신의 hand-off시와 같은 빠르고 정확한 동기를 요구하는 시스템에 유용하게 사용될 것이다.

• 정보처리학회논문지D
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• 제16D권6호
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• pp.881-888
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• 2009

본 연구에서는 소프트웨어 기반으로 물품관리를 하기 위한 VMDC(View, Model, Dispatcher, Controller) 아키텍처를 제안한다. 물품을 인력이 아닌 소프트웨어로 관리하기 위하여 여러 아키텍처들이 존재한다. MVC와 기존 아키텍처의 경우, 공통된 객체의 전달로 불필요한 데이터가 이동되는 문제점이 발생한다. 따라서 이와 같은 문제점을 해결하기 위하여 VMDC(View, Model, Dispatcher, Controller) 아키텍처를 제시하고자 한다. VMDC(View, Model, Dispatcher, Controller) 아키텍처의 Dispatcher(사령부)는 각 Controller(컨트롤러)가 필요로 하는 데이터를 파악하고 그것을 기반으로 하여 객체를 재구성함으로서 효율적인 데이터 이동을 하도록 한다. 또한 VMDC(View, Model, Dispatcher, Controller) 아키텍처를 이용하여 개발된 식품관리 프로그램으로 사용사례를 보이고, 효율성을 제시 후 향후 연구방향 또한 제시한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(II)
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• pp.1125-1128
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• 1987

This paper proposes a method which distributes the structure data represented by a tree and handles it. To distribute and handle the structure data, this method partitions a structure data and distributes the partitioned structure in multiple processing element and allocates the partitioned structure. Each processing element includes the structure memory to store the partitioned structure and the structure controller to handle efficiently the distributed structure. As the structure is distributed and is stored in the structure memory and is handled by the structure controller, the processing time is reduced.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 G
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• pp.3120-3122
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• 1999

In this paper we have designed the signal processing system for driving the Poly-Si TFT LCD of EWS. The signal processing system consist of timing controller, ramp signal generator and video signal processing system. Timing controller includes the top-down inversion. left right inversion, left-right shifting and control signal generator according to multi-source signal. The video signal processing system generates sawtooth-shaped waveform by using PROM and DAC for multi-gray scales and implements gamma correction function for compensating the TFT-LCD nonlinear charcteristic of the TFT-LCD. Finally we have discussed the experiment results and its application according to the designed TFT-LCD driving system.

• 한국전자통신학회논문지
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• 제6권3호
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• pp.381-387
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• 2011

광범위한 지역의 센서들로부터 데이터를 획득, 제어, 감시 등을 수행하는 계측제어기는 중앙 제어실과 유기적 관계를 유지한다. 그러므로 계측제어기는 유선망보다 무선망이 효율적이다. 그러나 무선망을 이용하게 되면 외부로부터 안전성에 커다란 문제가 발생된다. 그러므로 본 논문은 계측제어기의 네트워크 효율성을 증대시키기 위하여 계측제어 무선망에 적합한 MS-WP 암호시스템을 제안하였다. 제안된 MS-WP 암호시스템을 칩 레벨로 구현하여 모의실험을 수행한 결과, AES 알고리즘에 비하여 130% 처리율 증가 및 시스템 효율이 2배 증가됨을 확인하였다. 제안된 MS-WP 암호시스템은 보안성을 증대시키며 저전력화가 가능하고 처리속도가 빨라 계측제어기에 적합할 것이라 사료된다.

• 신재생에너지
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• 제7권4호
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• pp.58-65
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• 2011

In variable-speed variable-pitch wind turbines, the conventional approach for controlling power-production operation relies on a generator-torque controller and a rotor-collective blade-pitch controller. Both controllers use the generator speed measurement as the sole feedback input. In order to mitigate unwanted excitation of the control system, many filters are adopted. In this study, the characteristics of some filters for signal processing are investigated based on frequency response function. They include low-pass filters, band-pass filters, and notch filters. Especially, this study focuses on design parameters of their filters.