• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.879-883
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• 2000

A system for measuring and adjusting the oscillating frequency of a balance wheel whick determins the accuracy of mechanical timers. The balance wheel oscillates rotatively suspended by a hair spring which is welded at the other end to the pivot tube. The natural oscillatory frequency of the balance wheel is determined by the length of hairspring from the balance wheel to the point if other parameters the length in the torsional oscillation model are not changed, so the frequency of the balance wheel can be adjusted to meet a requirement by the adjustment of the hairspring length using ultrasonic welding. And the movement of wheel teeth is measured in realtime by a high speed photo fiber sensor and Auto Correlation is used to find a more accurate oscillation period from the measured signal with some variations.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2006년도 전력전자학술대회 논문집
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• pp.155-157
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• 2006

Electrical motors are an integral part of industrial plants with no less than 5 billion motors built word wide every year and the BLDC motor have been increased demand on industrial application. This paper presents BLDC motor control algorithm for cost effective motor application using general purpose microprocessor which have only one on-chip timer and describes how to realize pulse width modulation(PWM) signals with general input/output(I/O) ports to control a three-phase permanent magnet brushless do motor using timer interrupt on MSP430F1232.

• 한국통신학회논문지
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• 제33권11B호
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• pp.989-997
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• 2008

The reverse acknowledgment (RA) scheme supports a fast loss recovery for negative acknowledgment (NAK)-based selective repeat automatic repeat request (SR-ARQ) by detecting a retransmission failure quickly before a retransmission timer expires. In this paper, we evaluate the performance of a NAK-based SR-ARQ protocol with the RA scheme and compare it with the conventional NAK-based SR-ARQ protocol. Particularly, we propose a simple analysis model for the transport delay of the NAK-based SR-ARQ protocol considering the traffic condition, the retransmission persistence, the timer-based retransmissions and the RA scheme's behavior. Both NAK-based SR-ARQ protocols with and without the RA scheme are implemented by using the OPNET simulator. We verified the analysis model's accuracy through the simulation results. Also, we evaluate the performance of the NAK-based SR-ARQ protocol with the RA scheme based on analysis and simulation results.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.117-117
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• 2000

This paper presents experimental results for peformance management of a Profibus-FMS network. The performance management alms to maintain a uniform level of network performance at all stations under changing network traffic. The performance management algorithm monitors the performance of individual network stations and commands the stations to change their timer values in order to have comparable performance at all stations. In order to determine the amount of timer change, the algorithm employs a set of fuzzy rules. This algorithm has been evaluated on a Profibus network

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.723-726
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• 1988

This paper is a study about the automatic control of wheelchairs. This is realized by joystick, and is simulated by voice signal recognition. The control system by joystick is designed as follows: joystick paddle is connected with a timer and this timer ouput is high only when the joystick is moved. A computer reads the duration of this high state, and ouputs motor control word decided from this value using look-up table. The control system by voice signal is designed as follows: partial autocorrelation coefficients are computed from A/D converted signals and these values are compared with referance patterns. From this, the motor control word is decided on by the neareast neighbor rule.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제50권3호
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• pp.141-146
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• 2001

This paper presents a one digital controller two topology PWM DC-DC converter that controls, simultaneously, the separate Buck converter and boost converter with the different specification by using an inexpensive and efficient 8 bit micro-controller. One timer interrupt is used for the detection of output feedback voltage, and other two timer interrupts are used for the generation of PWM waveform for Buck and Boost converter. The control characteristics of one digital controller two topology PWM DC-DC converter is validated by experimental results.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2017년도 제56차 하계학술대회논문집 25권2호
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• pp.19-20
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• 2017

전투체계 SW 설계 시 실시간성은 중요하게 고려되어야 할 요소이다. 예로 전투체계 SW 중 하나인 장치관리 모듈은 전투체계를 구성하는 연동단 및 정보처리장치의 운용 상태를 감시하고 상태정보 메시지를 체계관리 모듈에 일정한 주기로 보고하기 위해 실시간성이 요구되어진다. 하지만 장치관리 모듈을 비롯한 전투체계 SW의 운용환경은 실시간성 제공이 어려운 윈도우 운영체제를 사용하고 있다. 또한 전투체계 SW는 재사용성이 높아 멀티 프로세서 환경을 고려하지 않은 설계와 개발 중 추가된 여러기능의 혼재로 실시간성 만족에 어려움이 있다. 이 문제를 해결하기 위해 본 논문에서는 전투체계 SW에 실시간성의 확보를 위한 방안에 대해 연구하였다. 그 방법으로 ms단위의 이벤트 발생이 가능한 실시간 타이머와 CPU 할당을 이용한 쓰레드 스케줄링 방안을 제안하였으며 장치관리 모듈에 적용하였다. 그리고 실험을 통해 성능을 입증하였다. 본 논문에서 제안한 방안은 별도의 상용 솔루션이나 커널 수정이 불가능한 경우 응용 SW 수정으로 실시간성을 높일 수 있다는 장점을 가진다.

• 대한전자공학회논문지
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• 제20권4호
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• pp.16-23
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• 1983

본 논문은 일반적인 제조공정에서 시퀀스 제어용으로 사용될 수 있는 프로그램어블 콘트롤러의 설계제작에 관한 것이다. 본 PC는 Z-8OA마이크로프로세서를 근간으로 하여 하드웨어로는 프로그래밍장치, 입력/출력 모듈, 타이머/퀴운터 모듈과 정전 복구기능 모듈이 제작되었고, 소프트웨어로는 초기상태화 프로그램, 모니터 프로그램, 실행 프로그램 및 정전복구 프로그램이 개발되었다. 특히 한 개의 타이머를 각각 다른 시간 간격으로 여러번 사용할 수 있게 하는 기능과 스캔타임을 줄일 수 있도록 실행 프로그램에 스킵 기능을 새로이 개발하였다.

• 한국유체기계학회 논문집
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• 제11권3호
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• pp.50-55
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• 2008

The diverter system is a key component in achieving a high accuracy liquid flow rate standard using a static gravimetric system with a flying start and stop method. The diverter is a moving device used to direct flow alternately along its normal course(by pass) or towards the weighing tank. The time needed for collection into the weighing tank is measured using a timer. So it is important to the diversion period is sufficiently fast and triggering point of timer which is determined the filling time. On this studies show that uncertainty of diverter system for changing diversion speed and triggering point was estimated in accordance with Guide to The Expression of Uncertainty in Measurement(ISO).

• 한국정보처리학회논문지
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• 제6권5호
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• pp.1351-1361
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• 1999

The wide spread of multimedia system demands a large area viewing display device which can inform a message to many people in open area. This paper is about the design of a large area viewing LED panel control system. The control system runs on 16 bit microprocessor MC68EC000 and has following functions: 16 line clock and time, 2 channel priority interrupt, 2 channel direct memory access, 2 channel 12 bit clock and timer, 2 channel infrared remocon receiver, 2 channel RS-232C with 16 byte FIFO, IBM PC/AT compatible keyboard interface, ISA bus, battery backuped real time clock, battery backuped 256 byte SRAM and watch dog timer. The core circuits are implemented to ASIC, considering lower cost, higher reliability, higher performance, smaller dimension, and lower power consumption. This is verified by simulation and fabricated in 0.6 um CMOS SOG processes. The total gate count is 39,083 and the clock frequency is 48 MGz. The fabricated ASIC is mounted on test board.