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왜율개선과 동거제어를 위한 이산제어에 의한 UPS의 제어에 관한 알고리즘의 구현에 관한 연구
박해암,조정래 광주보건대학 1994 論文集 Vol.19 No.-
Recently UPS(Uninterruptible Power Supply) systems are widly used in a variety of fields as a highly reliable power source. But most of an UPS has a dual structure using analog circuits, digital or micro-processor for PWM and phase synchronous controller. We present algorithm and technique using a discrete control even amplitude and synchronous for an UPS in this paper. The proposed system in this paper is composed of a ROM, an A/D converter, a CTC, and a control S/W. The amplitude controller consists of the ROM written modulation index from 0.75 to 0.99 of the PWM data and the A/D converter as an error voltage detector. A timmer and counter mode of the CTC is used a controller for a phase synchronous. We have simulated the algorithm and technique by using an IBM PC/386(40MHz) as a controller, and have obtained the lower distortion and the fast response on synchronous driving as a result. From this result, we recognized that the proposed algorithm and technique is able to apply for an UPS system using only discrete control. This has an advantage in a manufacturing system, because it is able to be used at a flexible and widly applicative operation range by an adjusting a control program.
전정기능 검사를 위한 Fuzzy에 의한 추종제어 Rotatory Chair System 구현에 관한 연구
박해암,김희수 광주보건대학 1993 論文集 Vol.18 No.-
A sinusoidal rotatory chair system using a self-tuning and following control by fuzzy was designed to evaluate the vestibular function and to apply to a robot driving power system. The sinusoidal rotatory chair system consists of a IBM PC / AT 286 with a interface 8255 a kind of P10 as a controller The experimental results by the sinusoidal rotatory chair system were pretty good, and which had smaller then ±210 pulse error on the ±810° sinusoidal rotation at 0.12 Hz by using a 850W DC servo motor. The chair system was applied to evaluate the vestibular function, and nystagmic eye movement was obtained by sinusoidal rotation of the body. On the basis of the above results, the sinusoidal rotatory chair system may be useful to evaluate the vestibular function in the field of medicine, and it can be used to robotics or a numerical control system (NC) on the industry if the obtained control method and the system are adapted for a channel.
이산 PI제어방식에 의한 DC Servo전동기 속도제어에 관한 연구
박해암 광주보건대학 1991 論文集 Vol.16 No.-
A PI controller has a advantage that is able to control a respones of the system, not by needing a ceratin parmeter, but by selecting appropriatly the coeffients k,(proportional constant)and k,(integral constant) as a control factor. A descrite PI controller is implemented easily using a micro-processor, and it can be confirmed to a adaption of a system and real time proceesing. In this paper, a speed controller by discrite PI control using a IBM PC/AT (12MH(z)) as a micro-processor is implemented and applied to a DC servo motor. In designing the discrite PI controller, A sampling time and a speed is than calculate the gain. Therefore the speed of a DC servo motor is obtained and controlled regulaly. The designed and manufactured descrite PI control system is experimented. The result shows the good respone at the 250RPM and 500RPM on the load using the load-spring. The speed error is under 1% on the steady load, but nearly 1~2% on the transient load.
Array처리기법에 의한 PTC 서미스터 소자의 분류 검사기 개발
박해암 광주보건대학 1996 論文集 Vol.21 No.-
The object of this developed system was for measuring and sorting the PTC(Positive Temperature Co-efficient), which has been widely used in industrial application, especially in the electronics field and in computer engineering. The other methods measure and sort one PTC in one processing using a large and heavy steel disk, so that the processing capability is limited to under 110 PTC per minute. In addition, it processes only I PTC per processing time and requires a high starting torque motor and large breaking power source to stop. The proposed development system used a high speed sampling A/D converter and an array processing technique to measure and sort on a light conveyer for a continual processing. The arrays consisted of 5 arrays, one for measuring and the others for distinguishing the grade. Those were 8 columns and 8 rows that could process 64 PTCs at once, therefore the processing speed was increased up to 8,800 PTCs per I minute. It was also able to evaluate and distinguish the PTC's performance and grade. The algoritm in this system employed a temporal parallelism and a spatial parallelism for increasing measurement and sorting. The proposed processing algorithm on this system was 80 times faster than the other method.
박해암 광주보건대학 1991 論文集 Vol.16 No.-
A general method to measure a noise of a automobile tire is used of a microphone array. This method has the weakness that a walled micro-phone array causes a reflection and a diffraction, and so a sampled on a micro-phone array is distorted. But this weakness is improved by micro-phone which traces a course to a setted up measuring point on a made up cartesian coordinate. This method requires that micro-phone is accurately moved into a setted up measuring point. In this paper, a cartesian coordinate type robot for automobile tire noise measuring to search a source of noise is implemented by co-operated with IBM PC/AT (12MH(z)) as a host and a micro-processor 280 as a channel for the precise movement. This designed, manufactured and implemented robot system is experimented. The result has been obtained the pretty good movement on the X,Y coordinate in the full range 2000mm.
모바일 심전도계에서 ADC변환 오차와 잡음 제거 알고리즘
박해암(Hae Am Park) The Research and Information Service 2008 남부대학교 논문집 Vol.8 No.-
산업사회에서 생활을 영워하고 있는 현대인의 생활형태는 과다한 영양섭취와 이에 비해 적은 운동량으로 고지혈, 고혈압 관상동맥 이상 등 여러 가지 요인에 의하여 부정맥 환자가 증가하고 있다. 이러한 부정맥 환자의 병소를 진단하기 위해서는 장시간 관찰이 필요하지만 다양한 생활영위 수단으로 정확한 진단을 행할 수 없어서 위급한 상황이 발생하면 짧은 시간 내에 치료가 이루어져야 함에도 불구하고 실기하는 경우가 종종 발생한다. 고도로 발달한 IT기술로 이동이 가능하며 상시 관찰이 가능한 심전도기가 발표되고 제품화되어 임상현장에 보급되지만 고도의 신뢰성이 요구되는 의료기기임으로 상당한 고가이며 의료수가 역시 비교적 높다고 사료된다. 이러한 문제점은 의료기기 시장의 형편도 있지만 고가의 부품을 사용하는 데에서도 기인한다. 따라서 초기 증상이 의심되는 환자를 위한 보급형 심전도기를 개발할 필요가 있다. 그러기 위해서는 핵심을 이루는 신호처리에 관련된 비용을 낮추어야 할 필요가 있다. 그러나 기존의 신호처리 알고리즘은 고속연산속도와 높은 해상도틀 갖는 ADC 변환기를 사용하기 때문에 그 비용이 한계점에 이르렀다고 사료된다. 그러므로 본 연구에서는 낮은 해상도에서도 외부로부터 유입되는 잡음과 변환오차을 확실하게 제거하는 알고리즘을 제안하여 타당성을 입증하고자 하였다.