• 대한수학회보
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• 제38권2호
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• pp.293-302
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• 2001

We improve the greedy algorithm which is one of the general convergence criterion for certain iterative sequence in a given space by building a constructive greedy algorithm on a normed linear space using an arithmetic average of elements. We also show the degree of approximation order is still $Ο(1\sqrt{\n}$) by a bounded linear functional defined on a bounded subset of a normed linear space which offers a good approximation method for neural networks.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
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• pp.725-730
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• 1994

A sodium chloride crystallizer shows oscillatory and nonlinear characteristics under its nucleating and growing process. Because these characteristics vary with operational condition, we can't control the product crystal size exactly with a PID controller or a sequence controller. Then, we make a model with threefold neural networks for the laboratory equipment that is a jet mixing crystallizer. We try to control the product crystal size with its neuro-model, and we reach the conclusion that our neuro-model is applicable to the practical crystallizer.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.1140-1145
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• 1989

A general dynamic iterative learning control scheme is proposed for a class of nonlinear systems. Relying on stabilizing high-gain feedback loop, it is possible to show the existence of Cauchy sequence of feedforward control input error with iteration numbers, which results in a uniform convergance of system state trajectory to the desired one.

• Journal of applied mathematics & informatics
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• 제8권3호
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• pp.1027-1033
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• 2001

In this paper we obtain the necessary and sufficient conditions for convergence concerning the Mann iterative sequences with errors for the class of continuous accretive operators in smooth Banach spaces.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 봄 학술발표회 논문집
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• pp.611-616
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• 2000

Numerical studies were carried out to investigate the long-term behavior of late plates in basement, subjected to combined in-plane compressive and transverse loads. For the numerical studies, a computer program of nonlinear finite element analysis was modified by adding function of creep and shrinkage analysis. This numerical method was verified by comparison with the existing experiments. Parametric studies were performed to investigate the strength variations of flat plates with three parameters; 1) loading sequence of floor load, compression and time 2) uniaxial an biaxial compression and 3) the ratio of dead to live load.

• Journal of applied mathematics & informatics
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• 제27권3_4호
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• pp.557-566
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• 2009

In this paper, we present the three-step mean value iterative scheme and prove that the iteration sequence converge strongly to a common element of the set of fixed points of a nonexpansive mappings and the set of the solutions of the variational inclusions under some mild conditions. The results presented in this paper extend, generalize and improve the results of Noor and Huang and some others.

• 전기의세계
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• 제29권3호
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• pp.179-184
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• 1980

This paper presents in some detail a discussion of the design of the digital control system without nonlinear elements to exhibit deadbeat performance in response to step inputs. The transfer function of digital dontroller is obtained by calculating the sequence of inputs and outputs of the digital controller for deadbeat performance. Digital controllers are designed for unity feedback multivariable systems by this method, which is well adapted for obtaining a solution by a digital computer.

• Nonlinear Functional Analysis and Applications
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• 제28권3호
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• pp.685-702
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• 2023

This paper is concerned with fixed point results of a finite family of multi-valued Osilike-Berinde nonexpansive type mappings in hyperbolic spaces along with some numerical examples. Also strong convergence and ∆-convergence of a sequence generated by Alagoz iteration scheme are investigated.

• 한국통신학회논문지
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• 제30권4A호
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• pp.288-295
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• 2005

OFDM(orthogonal frequency division multiplexing) 통신 시스템은 고속 무선 데이터 전송에 적합한 방식으로 널리 알려져 있지만, 높은 PAPR(peak-to-average power ratio)로 인하여 HPA(high power amplifier)에서 큰 비선형 왜곡을 겪는 문제점을 갖는다. 본 논문에서는 이러한 높은 PAPR을 저감하는 방법으로 더미 시퀀스(dummy sequence)를 삽입하는 새로운 SLM (selective mapping)방식을 제안하며, 이를 DSI-SLM기법이라 하기로 한다. 제안된DSI-SLM 기법은 각 브랜치(branch)에서 일정비율의 부반송파에 각기 다른 더미 시퀀스를 인가하고 IFFT(inverse Fourier transform) 후 가장 낮은 PAPR을 갖는 브랜치의 데이터를 전송한다. 이 방식에 사용된 더미 시퀀스는 송신단에서 PAPR 저감만을 위해 사용될 뿐 수신단에서의 데이터 복원 과정에는 필요로 하지 않으므로, 기존의 SLM및 PTS에서 나타나는 부가정보 전송의 필수성과 같은 단점을 해결하면서 실시간 데이터 처리를 가능케 한다.

• 한국전자통신학회논문지
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• 제14권5호
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• pp.1001-1008
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• 2019

고품질 의사랜덤수열 생성은 암호화 프로토콜을 포함한 많은 암호화 응용 프로그램에서 매우 중요한 부분이다. 그러므로 의사랜덤수열 생성기(Pseudo Random Number Generator, 이하 PRNG)는 암호시스템에서 키수열 생성하는데 꼭 필요한 요소이다. PRNG는 고품질의 랜덤한 큰 데이터 스트림을 효과적으로 생성해야 한다. CA 기반의 PRNG는 LFSR기반의 PRNG에 의해 출력되는 난수열보다 랜덤성이 우수하다는 사실은 이미 잘 알려져 있다. 본 논문에서는 비밀키 암호시스템에서 보다 안전한 비트스트림을 생성하고 키 공간을 확장할 수 있는 PRNG를 설계하기 위해 최대길이를 갖는 90/150 셀룰라 오토마타(Cellular Automata, CA)로부터 유도된 여원 CA가 최대길이 CA임을 보인다. 또한 90/150 최대길이 CA(MLCA)와 여원벡터로부터 유도된 여원 MLCA의 각 셀에서 출력되는 수열 중 비선형 수열을 출력하는 셀의 위치를 분석한다.