• 전자공학회지
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• 제2권2호
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• pp.37-42
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• 1975

램프형 A/D 변환기의 직선도의 정밀도에 영향을 미치는 여러 가지 원인들을 실험적으로 고찰하였다. 아울러 램프형 A/D 변환기의 직선도, 정밀도, 및 상계오차를 개선하기 위한 회로소자의 결정방법을 제안하였다. Various factors which affect the linearity and accuracy of the ramp type analog-to-digital converter have been investigated experimentally. A suggestion hav been made in the determination of circuit parameters with the emphasis on the improvement of the linearity and accuracy in the ramp type analog-to-digital conveter.

• 전자공학회논문지A
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• 제33A권6호
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• pp.230-238
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• 1996

In this paper, digital corrction and calibration circuit for a high-resolution CMOS pipelined A/D converter are proposed. The circuits were actually applied to a 12 -bit 4-stage pipelined A/D converter which was implemented in a 0.8${\mu}$m p-well CMOS process. The proposed digital correction logic is based on optimum multiplexer and two nonoverlapping clock phases resulting in a small die area snd a modular pipelined architecture. The propsoed digital calibration logic which consists of calibration control logic, error averaging logic, and memory can effectively perform self-calibration with little modifying analog functional bolcks of a conventional pipelined A/D conveter.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 D
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• pp.2013-2014
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• 2006

For large capacity optical CDMA networks, we propose a shared-type encoder/decoder based on an tunable wavelength conveter (TWC) and an arrayed waveguide grating (AWG) router. Feasibility of the structure of the proposed encoder/decoder for dynamic code allocation is tested through simulations using three types of wavelength/time 2-D codes, which are the generalized multi-wavelength prime code(GMWPC), the generalized multi-wavelength Reed-Solomon code(GMWRSC) and the matrix code. Test results show that the proposed encoder/decoder can increase the channel efficiency not only by increasing the number of simultaneous users without any multiple-access interference but by using a relatively short length CDMA codes.

• 전기전자학회논문지
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• 제23권3호
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• pp.1082-1087
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• 2019

본 연구에서는 초소형 무선송 수신용이 가능한 심전도 모듈개발에 필요한 ECG 신호증폭기, 무선 송 수신기 회로, 신호 처리용 필터회로 및 A/D 컨버터회로설계를 수행하였다. 심전도 센서의 성능 검증을 위하여 gateway 거리에 따른 신호잡음비를 측정하기 위해 1 m ~ 3 m까지 실시하였다. 실험결과 2 m 거리에서의 신호잡음비는 평균 17.18 dB 결과를 나타냄으로써 상용화에 필요한 요건을 갖추었다. 본 연구를 통해서 얻은 실험결과는 만성질환 관리를 위한 초소형 생체측정기기에 적용한다면, 원격모니터링 진단이 가능한 저비용, 고효율 모바일 헬스분야에 기여할 것으로 기대된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.70-72
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• 2005

The present paper designed a weight measuring instrumentation system in which data conversion and a series of signal processing were totally equipped. 16 loadcell are incoming sensors and each output of the loadcell was amplified and filtered for proper analog signal processing. Several measuring instrumentation OP amps and general purposed OP amps were used. 12 bits AID converters converted analog signals to digital bits and a PIC microprocessor controlled the 16 channels of loadcell. RF RS232 modules were used for wireless communication between the PIC microprocessor and an ethernet host for a remote sensor monitoring system development.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.586-589
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• 2001

This paper focuses on a method to connect mobile devices such as mobile robot, Automated Guided Vehicle(AGV) to a fieldbus. In this paper, the IEEE 802.11 wireless LAN is used to extend a Profibus-DP network for the mobile devices. In order to integrate these two networks, a protocol converter is developed with two process(i.e., master process of Profibus-DP and virtual master process of IEEE 802.11) and an transmission buffer. Futhermore, a virtual polling algorithm is developed at the protocol conveter in order to satisfy real-time requirements on data communication.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 춘계학술대회
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• pp.621-625
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• 2007

Oscillating wave amplitude in a bottom-mounted owe chamber designed for wave energy converter is investigated by applying characteristic wave conditions in Korean coastal water. The effects of shape parameters of OWC chamber in a view of wave energy absorbing capability are analyzed. Both experimental and numerical approaches are adopted and their results are compared to optimize the shape parameters which can result in a maximum power production under given wave distribution. The experiment was carried out in a wave flume under 2-D assumption of OWC chamber. In numerical scheme, the potential problem inside the chamber is solved by use of the Green integral equation associated with the Rankine Green function, while outer problem with the Kelvin Green function taking account of fluctuating air pressure in the chamber. Air duct diameter, chamber width, and submerged depths of front skirt and back wall of chamber changes the magnitude and peak frequency of wave absorption significantly.