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- 저자 : 안태천 (검색결과 173 건)
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Intuitionistic Fuzzy Semiprime Ideals of a Semigroups
안태천,허걸,강학수 한국수학교육학회 2007 純粹 및 應用數學 Vol.14 No.3
We introduce the concept of intuitionistic fuzzy semiprimality of a semi-group which is an extension of semiprimality in it. And we obtain a characterization of a semigroup that is a semilattice of simple semigroups in terms of intuitionistic fuzzy semiprime interior ideals.
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안태천 圓光大學校 1986 論文集 Vol.20 No.2
이 논문은 이노베이션 접근방법과 Berger가 제시한 극점배치방법을 결합시켜 이중적응 제어기를 설계하고 터어보-발전기계에 이용하여 이중적응 제어특성을 분석하였다. 이 제어기는 단일 입·출력계에 적용되므로 실제계와 동일한 특성을 갖는 최적 이산치 단일 입·출력계가 다변수계의 이중적응 제어를 위해 선택되었다. 이중적응 제어기의 신뢰도를 조사하기 위해 다변수계인 9차 쌍 입·출력 터어보-발전기계를 최적 이산치 단일 입·출력계인 3차 이산치계로 분해하여 이중적응 제어계를 설계하였다. This paper designed the active adaptive controller that was combined with a dual control algorithm developed by means of innovation approach and the pole placement method suggested by Berger, analyzed characteristics of the active adaptive control for the turbo-generator system. Because this controller is designed at the SI-SO systems, the optimal discrete SI-SO systems that have the similar dynamics as the orignal system are chosen for the active adaptive control of multivariable system. In order to investigate the application of the active adaptive controller, the 9th biinput-biouput thermal turbo-generator made of governor, synchronous machine and automatic voltage regulator was decoupled into 3 order discrete systems, hence the active adaptive control system for the decoupled systems was designed.
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Intuitionistic fuzzy ideals of a semigroup
안태천,허걸,장경원,노석범 호남수학회 2005 호남수학학술지 Vol.27 No.4
We give the characterization of an intuitionistic fuzzy ideal[resp. intuitionistic fuzzy left ideal, an intuitionistic fuzzy right ideal and an intuitionistic fuzzy bi-ideal] generated by an intuitionistic fuzzy set in a semigroup without any condition. And we prove that every intuitionistic fuzzy ideal of a semigroup S is the union of a family of intuitionistic fuzzy principle ideals of S. Finally, we investigate the intuitionistic fuzzy ideal generated by an intuitionistic fuzzy set in S1 .
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안태천,이종범 원광대학교 공업기술개발연구소 1991 工業技術開發硏究誌 Vol.11 No.-
MR is presented in order to estimate the frequency of multiple sinusoids from the finite noisy data with the white or color noise. MR, using the reduced order models, is designed, appling the approximation of linear system to LP. The MR method is analysed. Monte-carlo simulations are conducted for MR and LH. The results are compared with in terms of meanm, root-mean square and relative bias. MR eliminates effectively the extraneous and exceptional poles sppearing in LP and improves the accuracy of LP. Especially, MR gives promising results in short noisy measurements, low SNR's and coloured noises. Power spectral density and angular frequency position are showed by figures, for exzmples. Finally, the new method is untilized to the communication and biomedical systems estimating the charateristics of the signal and the system identification modelling the dynamic systems from experimental data.
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안태천 圓光大學校 1984 論文集 Vol.18 No.2
In this paper, quasi-direct adaptive controllers are studied which control discrete systems represented by linear vector difference equations whose parameters are unknown but constant. A recursive least square method wit a forgetting factor is used for plant parameter identifications. The Bezout identity which is inherent to indirect adaptive control schemes is not solved, and the recursive least square method is also used for controller parameter identifications. The proposed algorithm has a shorter computing time than for the indirect schemes. Convergence of real parameters is investigated by varying the forgetting factor which belongs to the parameter identification algorithm. It is shown that guasi-direct adaptive controllers with a forgetting factor are applicable to nonminimum phase systems. The controllers show that tracking and regulation are independently achieved in the limit with the bounded input and output for a range of initial plant parameter estimates. These approaches indicate that the constant trace identification algorithm yields the satisfactory results.
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안태천 원광대학교 공업기술개발연구소 1982 工業技術開發硏究誌 Vol.2 No.-
This paper presents a state-space approach for dealing with self-tuning control problems. A algorithm for system-parameter identification that is extended-parallel identification is derived. With the algorithm, modern control techniques can be easily applied to systems having stationary stochastic disturbances . The state-space version of the self-tuning control with new pole-placement using the output feedback is investigated. Based on the state-space approach s the proposed self-tuning control algorithm can be applied to the time-invariant linear systems including the unstable and monminimum-phase systems.
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간략화된 최우도 방법을 사용한 다중 정현파의 주파수 추정
안태천,오성권,Ahn, Tae-Chon,Oh, Sung-Kwun 한국음향학회 1994 韓國音響學會誌 Vol.13 No.4
다중 정현파의 주파수를 추정하는 최우도(ML) 방법은 주파수 추정에 정밀도를 보여주고 있으나, 최우도 함수가 주파수 추정에 쓰이는 경우 고도의 비선형성 때문에 추정에 많은 희생을 요구하고 있다. 본 논문에서는 최우도 방법의 비선형성을 개선하기 위해, 신호속에 포함된 정현 주파수의 추정을 용이하게 할 수 있는 단순화된 최우도 방법을 제시한다. 이 새로운 주파수 추정 방법을 백색 또는 칼라 잡음의 보기들에 적용하고, Monte-carlo 시뮬레이션을 실행하여 통계적 평균값, 평균 제곱근 및 상대 바이어스를 기존의 가장 우수한 방법인 MFBLP 방법과 비교한다. 또한 스펙트럼 파우어 밀도와 단위 원에서의 주파수 위치를 그림을 통하여 나타낸다. The maximum likelihood(ML) estimation has excellent accuracy for frequency estimation of multiple sinusoids, but the maximum likelihood function requires much loss owing to the high nonlinearity. This paper presents a simplified maximum likelihood estimation, in order to improve the nonlinearity of the maximum likelihood estimation for frequencies of sinusoids in signals. This method is applied to the frequency estimation of sinusoidal signals corrupted by white or colored measurement noise. Monte-carlo simulations are conducted for the comparison of ML method with the best MFBLP method, in terms of sampled mean, root mean square and relative bias. The power spectral density and the position of frequency in unit circle are appeared in figures.
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