• 조명전기설비학회논문지
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• 제27권9호
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• pp.15-22
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• 2013

A new LED lamp driving technology with a charge pump instead of a conventional DC-DC converter is proposed. The proposed driving technology is used to control the LED lamp with digital dimming. The power loss in the zener diodes is reduced because the charging process of the capacitors is selectively controlled according to the digital control signal. From the experimental results, when dimming four LED lamps simultaneously, the average driving circuit efficiency of 89% is obtained, regardless of the dimming level. White light with color temperature over a range of 2800~7200K was produced by dimming control of red, green, blue and amber LED lamps with the proposed driving circuit. The characteristics of the driving circuits can be changed depending on the characteristics of the R, G, B, and A LED lamps. The efficiency of the driving circuits up to a maximum 89% can also be obtained depending on the combination of LED lamps. The driving technology with digital dimming control for LED lamps proposed in this paper would be effective for obtaining high efficiency in LED driving circuits and remote control of LED lamps using digital communications.

• 대한전기학회논문지
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• 제40권1호
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• pp.31-38
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• 1991

A direct digital control technique of a current source using the phase-controlled rectifier is presented. A digital firing technique without sensing the line voltage is proposed. This scheme generates firing pulses directly from error signal between command and output voltage. Thus the phase detection transformers filters and zero-crossing detector are unnecessary. The synchronism is modeled and analized. Also a software synchronization algorithm is presented without a look up table and controls the system in real time with fast dynamic characteristics. Using the single-chip microprocessor 8097BH, the direct digital control is implemented with minimal hardware structure. Using the time-weighted performance index, the optimal discrete IPM control technique is also proposed to control the current of the PCR.

• 한국지능시스템학회논문지
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• 제16권1호
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• pp.113-118
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• 2006

This paper presents a new linear-matrix-inequality-based intelligent digital redesign (LMI-based IDR) technique to match the states of the analog and the digital T-S fuzzy control systems at the intersampling instants as well as the sampling ones. The main features of the proposed technique are: 1) the affine control scheme is employed to increase the degree of freedom; 2) the fuzzy-model-based periodic control is employed, and the control input is changed n times during one sampling period; 3) The proposed IDR technique is based on the approximately discretized version of the T-S fuzzy system, but its discretization error vanishes as n approaches the infinity. 4) some sufficient conditions involved in the state matching and the stability of the closed-loop discrete-time system can be formulated in the LMIs format.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2005년도 춘계학술대회 학술발표 논문집 제15권 제1호
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• pp.378-381
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• 2005

This paper presents a new linear-matrix-inequality-based intelligent digital redesign (LMI-based IDR) technique to match the states of the analog and the digital T-S fuzzy control systems at the intersampling instants as well as the sampling ones. The main features of the proposed technique are: 1) the fuzzy-model-based periodic control is employed, and the control input is changed n times during one sampling period; 2) The proposed IDR technique is based on the approximately discretized version of the T-S fuzzy system, but its discretization error vanishes as n approaches the infinity. 3) some sufficient conditions involved in the state matching and the stability of the closed-loop discrete-time system can be formulated in the LMIs format.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1820-1825
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• 2005

DSP chip parameters of a digital hearing aid (HA) should be optimally selected or fitted for hearing impaired persons. The more precise parameter fitting guarantees the better compensation of the hearing loss (HL). Digital HAs adopt DSP chips for more precise fitting of various HL threshold curve patterns. A specific DSP chip such as Gennum GB3211 was designed and manufactured in order to match up to about 4.7 billion different possible HL cases with combination of 7 limited parameters. This paper deals with a digital HA fitting program which is developed for optimal fitting of GB3211 DSP chip parameters. The fitting program has completed features from audiogram input to DSP chip interface. The compensation effects of the microphone and the receiver are also included. The paper shows some application examples.

• 한국생산제조학회지
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• 제6권1호
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• pp.7-17
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• 1997

During the past decade, there were many well-established theories for the adaptive control of linear systems, but there exists relatively little general theory for the adaptive control of nonlinear systems. Adaptive control technique is essential for providing a stable and robust performance for application of industrial robot control. Neural network computing methods provide one approach to the development of adaptive and learning behavior in robotic system for manufacturing. Computational neural networks have been demonstrated which exhibit capabilities for supervised learning, matching, and generalization for problems on an experimental scale. Supervised learning could improve the efficiency of training and development of robotic systems. In this paper, a new scheme of adaptive-neuro control system to implement real-time control of robot manipulator using digital signal processors is proposed. Digital signal processors, DSPs, are micro-processors that are developed particularly for fast numerical computations involving sums and products of variables. The proposed neuro control algorithm is one of learning a model based error back-propagation scheme using Lyapunov stability analysis method. The proposed adaptive-neuro control scheme is illustrated to be an efficient control scheme for implementation of real-time control for SCARA robot with four-axes by experiment.

• 전력전자학회논문지
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• 제10권2호
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• pp.162-168
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• 2005

본 논문에서는 전력변환회로를 위한 디지털 전류모드제어기를 소신호 모델식을 기반으로 하여 설계한다. 다양한 응용 가능성을 내포하고 있는 디지털 제어기를 전류모드제어를 사용하는 전력변환회로의 설계에 응용한다. 전력변환회로의 상태평균화 기법을 적용한 연속 시간 소신호 모델을 이용함으로써 부스트, 벅, 벅-부스트 컨버터에 모두 적용 가능한 디지털 전류모드제어기를 설계하고, 설계한 제어기는 모든 시비율 동작 조건에서 안정함을 확인한다. 16bit DSP 마이크로프로세서인 TMS320LF2406A를 사용하여 설계된 디지털 제어기를 구현하고, 아날로그제어기를 이용한 전류모드제어에서의 동작 조건에 따른 불안정성 문제를 해결할 수 있음을 실험을 통해 확인한다.

• 대한전기학회논문지:시스템및제어부문D
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• 제50권10호
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• pp.457-463
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• 2001

This paper presents a simple and new digital redesign algorithm for fuzzy-model-based controllers. In the first stage, a continuous-time TS fuzzy model is constructed for a given continuous-time nonlinear system and a corresponding continuous-time fuzzy-model-based controller is established based on the existing controller synthesis algorithms. In the second stage, the continuous-time fuzzy-model-based controller is converted to equivalent discrete-time fuzzy-model-based controller, aiming at maintaining the property of the analogue controlled system, which are called intelligent digital redesign. Finally, the proposed method is applied to the digital control of inverted pendulum system to shows the effectiveness and the effectiveness and the feasibility of the method.

• 경영정보학연구
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• 제25권4호
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• pp.161-181
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• 2023

코로나19 이후 소비생활 환경의 비대면화가 급격히 앞당겨지면서, 변화하는 비대면 금융생활서비스는 소비자의 일상에 큰 영향을 미치고 있다. 이처럼 필수재화가 된 디지털 기기·서비스를 이용하지 못하는 국민은 일상생활뿐 만 아니라 사회·경제 전반에서 소외되는 '디지털 사각지대'에 내쳐질 위험이 높아지고 있다. 이에 본 연구에서는 지각된 통제력 요인인 인지 통제력, 행동 통제력, 결정통제력이 디지털 금융서비스 이용의도에 미치는 영향을 분석하였다. 본 연구를 위해 디지털금융을 알고 있으면서 이용의도가 있는 133명의 고객을 대상으로 설문조사를 실시하였다. 연구결과 인지 통제력, 행동 통제력, 결정 통제력은 디지털 금융서비스 이용의도에 유의적인 영향을 미치는 것으로 나타났다. 또한 프라이버시 염려에 대한 조절효과는 결정 통제력이 디지털 금융서비스 이용의도에 미치는 영향에서 유의하게 나타났다. 이러한 결과를 바탕으로 디지털 금융서비스 기업이 고객의 지각된 통제력을 관리할 수 있는지에 대한 시사점을 제시하였다.

• 한국지능시스템학회논문지
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• 제15권1호
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• pp.92-97
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• 2005

본 논문은 비선형 제어 시스템을 효과적으로 모사하는 TS(Takaki-Sugeno: TS) 퍼지 시스템의 펄스폭 변조 (Pulse-Width Modulated: PWM) 제환 제어기 설계 기법을 논의한다. 효율적이며 신뢰할만한 퍼지 PWM 제어기를 설계하기 위하여 전역적 지능형 디지털 재설계 기법(global intelligent digital redesign)을 이용한다. 우선 잘 설계된 아날로그 퍼지 제어기를 설계한 후 전역적 지능형 디지털 재설계 기법을 이용하여 디지털 퍼지 제어기를 설계한다. 유사한 전역적 상태정합 개념을 이용하여 재설계된 디지털 퍼지 제어기론 퍼지 PWM 제어기로 변환한다. 또한 재설계된 퍼지 PWM 제어기의 안정화 가능성을 조사한다.