• 대한임베디드공학회논문지
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• 제10권5호
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• pp.297-305
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• 2015

AFLS (Adaptive front lighting System) is being applied to improve safety in driving automotive at night. Safe embedded system for controlling head-lamp has to be tightly designed by considering safety requirement of hardware-dependent software, which is embedded in automotive ECU(Electronic Control Unit) hardware under severe environmental noise. In this paper, we propose an adaptive headlight controller with newly-designed symmetric angle sensor compensator, which is integrated with ECU-based adaptive front light system. The proposed system, on which additional backup hardware and emergency control algorithm are integrated, effectively detects abnormal situation and restore safe status of controlling the light-angle in AFLS operations by comparing result in symmetric angle sensor. The controlled angle value is traced into internal memory in runtime and will be continuously compared with the pre-defined lookup table (LUT) with symmetric angle value, which is used in normal operation. The watch-dog concept, which is based on using angle sensor and control-value tracer, enables quick response to restore safe light-controlling state by performing the backup sequence in emergency situation.

• 대한의용생체공학회:의공학회지
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• 제16권1호
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• pp.49-56
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• 1995

본 논문은 새로운 QRS comlex의 검출 알고리듬의 설계에 관한 연구로서 전처리 과정에 있어서 2단계의 적응 여파기를 설계하여 효과적인 잡음 제거 능력을 갖는 알고리듬을 제안 하였다. 1단계에서는 배경 잡음을 제거하고 2단계에서는 QRS complex만을 통과시킴으로, 잡음의 변동 뿐만 아니라 QRS comlex의 변화에도 적응 할 수 있게 하였다. 2단계의 적응 여파기는 각각 예측 오차 여과기와 유한 임펄스 응답을 갖는 여과기로 구성된다. 이때, 유한 임펄스 여과기의 계수는 예측 아 여과기의 계수를 이용하였다. MIT/BIT 데이타 베이스 중에서 비교적 잡음이 심한 105번과 108번을 가지고 실험을 한 결과 각각 99.3%와 97.4%의 검출율을 나타내었다.

• 전자공학회논문지SC
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• 제41권3호
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• pp.39-46
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• 2004

본 논문은 IPMSM 드라이브의 고성능 속도 제어를 위하여 퍼지제어와 신경회로망을 혼합 구성한 적응 FNN 제어기를 제시한다. 적응 FNN 제어기는 기준 모델에 기초한 적응 메카니즘을 적용하여 신경회로망의 고도의 적응제어와 퍼지제어기의 강인성 제어의 장점들을 접목한다. 적응 FNN 제어기의 출력은 FNN 제어기의 출력과 적응 퍼지제어의 출력을 합하여 출력을 얻는다. 적응 FNN 제어기는 다양한 동작조건에서 응답특성을 분석하고 평가한다. 제시한 적응 FNN 제어기의 타당성은 IPMSM 드라이브 시스템에 적용하여 성능 결과로 입증한다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제32권5호
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• pp.438-448
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• 2005

본 논문에서는 학습자들의 학습 특성 및 학습 능력에 따라 학습내용을 동적으로 구성하여 제공하는 적응형 교수 시스템을 제안한다. 본 논문에서 제안한 시스템은 학습 단계와 평가 단계를 연계함으로써 평가 단계에서 추정된 학습자의 능력에 따라 차기 학습 단계에서 수준별 학습내용을 동적으로 구성하여 학습자에게 제공함으로서 개인화된 교수${\cdot}$학습을 지원하고 있다. 이를 위해 먼저 학습자들의 학습 능력을 정확하게 평가할 수 있도록 문항반응이론에 의한 컴퓨터 적응적 평가를 이용하여 평가 단계를 구현하였으며, 또한 추정된 각 학습자의 능력 수준에 맞는 학습내용을 제공하기 위해 퍼지 개념을 이용하여 퍼지 수준 집합을 구성한 후 제공함으로써 학습자에 따른 수준별 학습이 가능하도록 학습 단계를 구현하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.570-572
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• 2005

This paper is proposed adaptive hybrid artificial intelligent(HAI) controller for high performance of induction motor drive. The design of this algorithm based on fuzzy-neural network(FNN) controller that is implemented using fuzzy control and neural network. This controller uses fuzzy rule as training patterns of a neural network. Also, this controller uses the back-propagation method to adjust the weights between the neurons of neural network in order to minimize the error between the command output and actual output. A model reference adaptive scheme is proposed in which the adaptation mechanism is executed by fuzzy logic based on the error and change of error measured between the motor speed and output of a reference model. The control performance of the adaptive FNN controller is evaluated by analysis for various operating conditions. The results of experiment prove that the proposed control system has strong high performance and robustness to parameter variation, and steady-state accuracy and transient response.

• Steel and Composite Structures
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• 제46권1호
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• pp.107-114
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• 2023

A new intelligent adaptive control scheme was proposed that combines observer disturbance-based adaptive control and fuzzy adaptive control for a composite structure with a mass-adjustable damper. The most important advantage is that the control structures do not need to know the uncertainty limits and the interference effect is eliminated. Three adjustable parameters in LMI are used to control the gain of the 2D fuzzy control. Binary performance indices with weighted matrices are constructed to separately evaluate validation and training performance using the revalidation learning function. Determining the appropriate weight matrix balances control and learning efficiency and prevents large gains in control. It is proved that the stability of the control system can be ensured by a linear matrix theory of equality based on Lyapunov's theory. Simulation results show that the multilevel simulation approach combines accuracy with high computational efficiency. The M-TMD system, by slightly reducing critical joint load amplitudes, can significantly improve the overall response of an uncontrolled structure.

• 한국정밀공학회지
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• 제11권6호
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• pp.143-157
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• 1994

This paper is concerned with the position control of electrohydraulic servo system under parameter variation. An adaptive sliding mode control which uses the direct parameter estimation scheme, is proposed to design a robust controller for fast and accurate control of the system. It is shown that the adaptive sliding mode control algorithm is robust and effective in attaining fast and accurate position control of system under time-dependent parameter variation. It is also shown experimentally that chattering phenomena in a sliding mode control can significantly be reduced by using boundary layer technique, and that new approach in sliding mode control introducing a term proportional to the distance between the current state and the sliding surface in the control law is effective to obtain fast response and to increase stability of the system. Computer simulation on the dynamic performance of the control system is also presented.

• 국제초고층학회논문집
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• 제13권1호
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• pp.69-83
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• 2024

In this study, we focused on 'Adaptive Reuse', which has the concepts of space reconstitution and social and cultural regeneration, so that previously constructed highrise buildings can accommodate various changes in modern society, and new spatial design was developed based on the characteristics of adaptive reuse. We sought to present the concept and direction, detailed strategies, and architectural response elements of space reconstitution for the purpose of realizing the typical spatial reorganization required by modern society and seeking directions and methods of space reconstitution that can be applied to future society. The purpose is to do so.

• 오토저널
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• 제13권1호
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• pp.35-45
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• 1991

A linear quarter model of a vehicle suspension system is built and simulated. Especially the so-called sensitivity analysis is conducted in order to show its applicability to design problems, and sensitivity function is determined in the frequency domain. The change of frequency response function is predicted, which depends on the design parameter variation and the property is verified by computer simulation. Typical performance measures, namely, sprung mass acceleration, suspension deflection, and tire deflection are examined. The vehicle model is analyzed for ist performance sensitivity as a function of the system's feedback gains. The variable feedback gains are selected as the spring and damping coefficients. Frequency response, RMS response, and performance index of the performance evaluation variables are considered and three-dimensional and contour plots of response surfaces are formed to examine output sensitivity to suspension feedback. Performance trade-offs over the entire frequency spectrum are identified from the FRF, and that between ride quality and handling characteristics are examined from the RMS responses.

• 한국강구조학회 논문집
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• 제20권1호
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• pp.93-104
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• 2008

국내 시공 중인 현수교의 시공단계에 대한 신뢰성 해석을 통한 위험성 평가를 실시하였다. 본 논문의 주요 연구목표는 (1) 현수교주케이블 소선의 파단에 대한 신뢰성 해석, (2) 보강형 거더 가설 28단계에 대한 위험단계 결정, (3) 보강형 거더 가설중 시공관리에 대한 한계상태의 신뢰성 평가이다. 기존의 현수교에 대한 연구와 설계는 주로 경험적인 데이터에 의존해 왔으나 최근 조사된 자료에 의하면 교량의 완공 전에 발생하는 사고의 원인의 80%는 인간의 오류, 계획, 설계, 재료 및 하중의 불확실성과 관련되어 있다. 교량의 완성계에 대해서는 많은 연구가 수행되어왔으나 시공중의 불확실성에 대해서는 시방서나 지침 등으로 정리되어 있지 않은 부분이 많다. 개선된 선형 적 용적 응답면기법을 사용하여 예제교량의 시공단계에 대한 위험성 평가를 하였다.