• 제목, 요약, 키워드: exact model matching

검색결과 27건 처리시간 0.034초

양기준 선호모형: 비 정형적 자료검색을 위한 의사결정 모형 (Double Anchors Preference Model (DAPM) : A Decision Model for Non-binary Data Retrieval)

  • 이춘열
    • Asia pacific journal of information systems
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    • v.2 no.1
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    • pp.3-15
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    • 1992
  • This paper proposes a new referential model for data retrieval as an alternative to exact matching. While exact matching is an effective data retrieval model, it is based on fairly strict assumptions and limits our capabilities in data retrieval. This study redefines data retrieval to include non-binary data retrieval in addition to binary data retrieval, proposes Double Anchor Preference Model (DAPM), and analyzes its logical charateristics. DAPM supports non-binary data retrieval. Further, it produces the same result as exact matching for the conventional binary data retrieval. These findings show that, at the logical level, the proposed DAPM retains all the desirable features for data retrieval.

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완전 모형 일치 기법을 이용한 분산 준최적 $H_2$필터 (Decentralized Suboptimal $H_2$ Filtering : An Exact Model Matching Approach)

  • 조남훈;공재섭;서진헌
    • 대한전기학회논문지
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    • v.45 no.2
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    • pp.256-264
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    • 1996
  • In this paper, the decentralized suboptimal H$_{2}$ filtering problem is considered. An additional term is added to the centralized optimal H$_{2}$ filter so that the whole filter is decentralized. We derive a necessary and sufficient condition for existence of proposed decentralized filters By employing the solution procedure for the exact model matching problem, we obtain a set of decentralized H$_{2}$ filters, and choose a suboptimal filter from this set of decentralized H$_{2}$ filters.

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Adaptive Predistortion for High Power Amplifier by Exact Model Matching Approach

  • Ding, Yuanming;Pei, Bingnan;Nilkhamhang, Itthisek;Sano, Akira
    • 제어로봇시스템학회:학술대회논문집
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    • pp.401-406
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    • 2004
  • In this paper, a new time-domain adaptive predistortion scheme is proposed to compensate for the nonlinearity of high power amplifiers (HPA) in OFDM systems. A complex Wiener-Hammerstein model (WHM) is adopted to describe the input-output relationship of unknown HPA with linear dynamics, and a power series model with memory (PSMWM) is used to approximate the HPA expressed by WHM. By using the PSMWM, the compensation input to HPA is calculated in a real-time manner so that the linearization from the predistorter input to the HPA output can be attained even if the nonlinear input-output relation of HPA is uncertain and changeable. In numerical example, the effectiveness of the proposed method is confirmed and compared with the identification method based on PSMWM.

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폭풍해일 침수예상도 검증을 위한 형상유사도 분석 : 형상기준 (Shape Similarity Analysis for Verification of Hazard Map for Storm Surge : Shape Criterion)

  • 김영인;김동현;이승오
    • 한국방재안전학회논문집
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    • v.12 no.3
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    • pp.13-24
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    • 2019
  • 실시간 재난위험도 예측 모델인 SIND 모델의 정확도 확인 및 검증을 위해 다양한 형상유사도 개념을 적용하였다. 기하학적 방법론 중에서 가장 널리 이용되는 CRITIC 기법은 침수예상도와 같은 복잡한 지형 형상에 적용하기에는 분명한 한계점을 보여서 본 연구에서는 복잡한 전파특성의 형상을 평가할 수 있는 RCCI와 TF 등과 같은 형상인자를 추가하여 수정된 CRITIC 기법을 제시하였다. 본 연구에서 제안된 형상유사도 평가 방법을 폭풍해일의 침수예상도에 적용하여 검토한 결과, 면 객체 쌍들을 수동으로 정 매칭쌍과 오 매칭쌍으로 구분하였으며, 각 형상 인자들, 위치기준, 면적기준, 형상 기준의 가중치들을 변화시켜가며 각 매칭쌍의 형상유사도를 산정하였다. 본 연구에서 제안된 방법론과 산정된 가중치를 참고자료인 침수예상도의 지도 객체와 목표자료인 SIND 모델결과의 객체에 적용한 결과, 정 매칭쌍은 약 90%가 형상유사도 0.5 이상의 값을 가졌고, 오 매칭쌍은 약 70%가 0.5 미만으로 나타났다. 향후 다수의 객체가 하나의 객체와 대응되는 점을 보완 조정한다면 정 매칭쌍의 형상유사도는 전체적으로 증가하고 오 매칭쌍의 형상유사도는 감소할 것이라 판단된다.

유사도 알고리즘을 활용한 시맨틱 프로세스 검색방안 (Semantic Process Retrieval with Similarity Algorithms)

  • 이홍주
    • 한국경영과학회:학술대회논문집
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    • pp.267-272
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    • 2007
  • One of the roles of the Semantic Web services is to execute dynamic intra-organizational services including the integration and interoperation of business processes. Since different organizations design their processes differently, the retrieval of similar semantic business processes is necessary in order to support inter-organizational collaborations. Most approaches for finding services that have certain features and support certain business processes have relied on some type of logical reasoning and exact matching. This paper presents our approach of using imprecise matching fur expanding results from an exact matching engine to query the OWL MIT Process Handbook. In order to use the MIT Process Handbook for process retrieval experiments, we had to export it into an OWL-based format. We model the Process Handbook meta-model in OWL and export the processes in the Handbook as instances of the meta-model. Next, we need to find a sizable number of queries and their corresponding correct answers in the Process Handbook. We devise diverse similarity algorithms based on values of process attributes and structures of business processes. We perform retrieval experiments to compare the performance of the devised similarity algorithms.

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모델 매칭법과 규범모델 추종방식에 의한 디젤기관의 적응속도제어 (An Adaptive Speed Control of a Diesel Engine by means of a Model Matching method and the Nominal Model Tracking Method)

  • 유희한;소명옥;박재식
    • 한국마린엔지니어링학회지
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    • v.27 no.5
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    • pp.609-616
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    • 2003
  • The purpose of this study is to design the adaptive speed control system of a marine diesel engine by combining the Model Matching Method and the Nominal Model Tracking Method. The authors proposed already a new method to determine efficiently the PID control Parameters by the Model Matching Method. typically taking a marine diesel engine as a non-oscillatory second-order system. But. actually it is very difficult to find out the exact model of a diesel engine. Therefore, when diesel engine model and actual diesel engine are unmatched as an another approach to promote the speed control characteristics of a marine diesel engine, this paper Proposes a Model Reference Adaptive Speed Control system of a diesel engine, in which PID control system for the model of a diesel engine is adopted as the nominal model and Fuzzy controller and derivative operator are adopted as the adaptive controller.

모델 맷칭법에 의한 디젤기관의 속도제어 (Speed Control of a Diesel Engine by Means of the Model Matching Method)

  • 유희환;하주식
    • 한국마린엔지니어링학회지
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    • v.20 no.3
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    • pp.131-137
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    • 1996
  • The existing digital governors are in the beginning stage. Placing the focus on the marine site, most of the digital governors developed are still using the simple PID algorithm. But, the performance of a diesel engine is widely changed according to the parameters of the PID controller. So, this article describes a new method to adjust the parameters of the PID controller in a marine digital governor. In this paper, the diesel engine is considered as a nonoscillatory second order system. A new method to adjust the parameters of the PID controller for speed control of a diesel engine is proposed by means of the model matching method. Also, the simulations by numerical methods are carried out in cases of the exact understanding or out of the parameters of a diesel engine respectively. And this paper confirms that the proposed new method here is superior to Ziegler & Nichols's method through the comparisons and analysis of the characteristics of indicial responses.

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선박용 디젤기관의 지능적인 속도제어시스템 (An intelligent Speed Control System for Marine Diesel Engine)

  • 오세준
    • 한국마린엔지니어링학회지
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    • v.22 no.3
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    • pp.320-327
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    • 1998
  • The purpose of this study is to design the intelligent speed control system for marine diesel engine by combining the Model Matching Method and the Nominal Model Tracking Method. Recently for the speed control of a diesel engine some methods using the advanced control techniques such as LQ control Fuzzy control or H$\infty$ control etc. have been reported. However most of speed controllers of a marine diesel engine developed are still using the PID control algorithm But the performance of a marine diesel engine depends highly on the parameter setting of the PID controllers. The authors proposed already a new method to tune efficiently the PID parameters by the Model Mathcing Method typically taking a marine diesel engine as a non-oscillatory second-order system. It was confirmed that the previously proposed method is superior to Ziegler & Nichols's method through simulations under the assumption that the parameters of a diesel engine are exactly known. But actually it is very difficult to find out the exact model of the diesel engine. Therefore when the model and the actual diesel engine are unmatched as an alternative to enhance the speed control characteristics this paper proposes a Model Refernce Adaptive Speed Control system of a diesel engine in which PID control system for the model of a diesel engine is adopted as the nominal model and a Fuzzy controller is adopted as the adaptive controller, And in the nominal model parameters of a diesel engine are adjusted using the Model Matching Method. it is confirmed that the proposed method gives better performance than the case of using only Model Matching Method through the analysis of the characteristics of indicial responses.

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Decentralized Suboptimal $H_2$ Filtering

  • 조남훈;공재섭;서진헌
    • 대한전기학회:학술대회논문집
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    • pp.323-325
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    • 1993
  • In this paper, the decentralized suboptimal $H_2$ filtering problem is considered. An additional term is added to the centralized optimal $H_2$ filter so that the whole filter is decentralized. We derive a sufficient condition for existence of such decentralized filters. By employing the solution procedure for the exact model matching problem, we obtain a set of decentralized $H_2$ filters, and choose a suboptimal filter from this set of decentralized $H_2$ filters. Naturally the resulting filter is guaranteed to be stable.

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Sampled-data Fuzzy Observer Design for an Attitude and Heading Reference System and Its Experimental Validation

  • Kim, Han Sol;Park, Jin Bae;Joo, Young Hoon
    • Journal of Electrical Engineering and Technology
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    • v.12 no.6
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    • pp.2399-2410
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    • 2017
  • In this paper, a linear matrix inequality-based sampled-data fuzzy observer design method is proposed based on the exact discretization approach. In the proposed design technique, a numerically relaxed observer design condition is obtained by using the discrete-time fuzzy Lyapunov function. Unlike the existing studies, the designed observer is robust to the uncertain premise variable because the fuzzy observer is designed under the imperfect premise matching condition, in which the membership functions of the system and observer are mismatched. In addition, we apply the proposed method to the state estimation problem of the attitude and heading reference system (AHRS). To do this, we derive a Takagi-Sugeno fuzzy model for the AHRS system, and validate the proposed method through the hardware experiment.