• Journal of the Korean Institute of Telematics and Electronics
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• v.9 no.4
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• pp.17-24
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• 1972

A simply constructed and inexpensive amplifier that exhibits unusually low noise is studied. The high-performance differential amplifier combines high input impedence, adjustable gain, low in put noise and low output impedance. The amplifier is particularly useful in applications which call for large amplificaions of very low level signals.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.299-303
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• 1995

This paper charcterizes dynamics of cold tandem minns, and constructs it state-space model of which are linear time invariant, using subspace method. Step responses particularly show the influence on mass transfer delay. Input-output data set are obtained form nonlinear differential equations including mass transfer delay and nonlinearity. It is shown that the identified state-apace model well approximates the original systems dynamics.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1181-1184
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• 1987

The input-output relation for nonlinear systems can be explicitly represented by the Volterra functional series and it is characterized by the Volterra kernels. A block diagram reduction method is proposed to determine the Volterra kernels and is compared with the direct substitution technique. The former method can significantly reduce the computational complexity.

• Proceedings of the KIEE Conference
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• 2004.07e
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• pp.92-95
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• 2004

Power transformer is an important apparatus in transforming and delivering the power in a power system. It shows less accident ratio than other system apparatus, but once the accident occurs, it causes long-term operation stoppage and economic loss. It brings high bad spillover effects. Therefore, the role of protective relaying, which is to prevent internal fault a power transformer is highly important. This study proposed advanced algorithm that can clearly determine internal fault of the power transformer and magnetizing inrush, through numerical analysis by using the terminal voltage and input output current.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.101.6-101
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• 2001

This paper deals with inspect algorithm using visual system. One of the major problems that arise during polymer production is the estimation of the noise of the product(bad pallets). An erroneous output can cause a lot of losses (production and financial losses). Therefore new methods for real-time inspection of the noise are demanded. For this reason, we have presented a development of vision system algorithm for the defect inspection of PE pallets. First of all, in order to detect the edge of object, the differential filter is used. And we apply to the labeling algorithm for feature extraction. This algorithm is designed for the defect inspection of pallets ...

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.83-85
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• 1986

The error differential equations which are derived by using the first error model are uniformly asymptotial stable if the input is bounded and sufficiently rich. In the adaptive control, the speed of convergence of system output or parameter error in such cases is of both practical and theoretical interest. In this paper, the adaptive algorithms(Gradient algorithm, Intergral algorithm) are discussed from the point of view of speed convergence and the modification of adaptive law for prohibition of overadaptation is discussed. The result is compared among this algorithms and the adaptive gain is choosed by this result(the speed of convergence).

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.1163-1166
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• 1999

In this paper, A CMOS power amplifier for PCS is designed with 0.65-$\mu\textrm{m}$ CMOS technology. Differential cascode structure is used which has good reverse isolation and wide voltage swing. This amplifier circuits consist of three stages which are power amplification stage, driver stage and power control stage. We obtain output power of 30 ㏈m, IMD3 of -31㏈c and efficiency of 30 % at input power of 4 ㏈m.

• 한국디지털정책학회:학술대회논문집
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• 2003.12a
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• pp.403-415
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• 2003

This study is performed to examine the relationships between trust and antecedents in cyberspace. Trust is the major control system in cyberspace. Different time, different spaces, different cultures, indistinct boundaries, flexible structure, separation of information from matters, cybernetics, difficulty of control are differential characteristics between cyberspace and physical space. Providing fit information, use of effective electronic channels, previous trust management, feedback system about output, flexible culture, self-regulation, off-line meeting, providing information about tasks and roles, ability, and justice are supposed to have effects on trust in cyberspace. By electronic mediated systems, the company will have more business opportunity. But trust will be conditional factors of expanding business in cyberspace.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.33 no.1
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• pp.1-8
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• 1984

The system of synchronous generator with power static converter are analyzed in detail and the output characteristics of generator are computed by digital simulation. The power static converter is considered as 3-phase converter in which the interlude interval and the commutation interval repeats itself six times per cycle. The synchronous generator is considered as a direct-phase quantities model for a more exact study of the performance. As the numerical method for nonlinear differential equations of the system, the Runge -Kutta method is used.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.172-173
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• 2017

본 논문은 벅 차동전력조절 회로가 적용 된 다출력 스위치드-커패시터 부스트 컨버터의 소신호 모델 분석에 대한 논문이다. 제안하는 회로는 각 태양광 모듈의 최대전력점을 추정하기 위해서 제어된다. 제안하는 회로는 상태 공간 평균화 기법과 시그널 플로우 그래프를 통해서 해석하였으며 PSIM과 MATLAB을 통해서 증명하였다.