• Title/Summary/Keyword: N-tuple

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N-tuple Filtering Using Genetic Algorithm (유전자 알고리즘을 이용한 n-tuple 필터링)

  • 한우연;남미영;이필규
    • Proceedings of the Korean Information Science Society Conference
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    • 2004.10b
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    • pp.796-798
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    • 2004
  • continuous n-tuple 알고리즘은 tuple의 무작위적 추출을 기본으로 한다. 무작위적 추출의 여러 가지 장점을 감안하더라도, 무작위적 추출을 통한 인식의 성능은 가변성물 가지게 된다. 그리고 무작위적 추출은 의미 있는 정보의 선택이 불가능하다는 단점을 가진다. 본 논문에서는 무작위적 추출이 가지는 설러 가지 약점을 보완하기 위해서, 유전 알고리즘을 이용하여 얼굴인식에 효과적인 tuple을 선택하여 사용하였다. 유전 알고리즘을 이용함으로서 얼굴 인식에 효과적이지 않은 tuple의 필터링 효과를 기대할 수 있다.

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N-tuple classifier for effective face recognition (얼굴 인식에 효과적인 n-tuple classifier)

  • Han Woo-Yeon;Nam Mi-Young;Rhee Phill-Kyu
    • Proceedings of the Korea Information Processing Society Conference
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    • 2004.11a
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    • pp.915-918
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    • 2004
  • 얼굴 인식을 위한 명도값 매칭 알고리즘들 중에서도 Continuous n-tuple classifier는 tuple의 무작위적 추출을 기본으로 하여 만들어 졌다. 무작위적 추출은 단순성과 빠른 속도 등의 장점에 반해 인식의 성능의 가변성을 단점으로 갖는다. 그리고 학습 데이터 추출 방법의 변화에 따른 인식률 변화라는 문제점이 있다. 본 논문에서는 무작위적 추출이 가지는 여러 가지 약점을 보완하기 위해서, 유전 알고리즘을 이용하여 얼굴 인식에 효과적인 tuple을 선택하여 사용하였다. 유전 알고리즘을 이용함으로서 얼굴 인식에 효과적인 tuple의 필터링 효과를 기대할 수 있다. 또한 학습 데이터 추출 방법의 변화에 따른 인식 성능의 향상을 확인할 수 있었다.

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ON THE TAYLOR-BOWDER SPECTRUM

  • Jeon, In-Ho;Lee, Woo-Young
    • Communications of the Korean Mathematical Society
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    • v.11 no.4
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    • pp.997-1002
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    • 1996
  • In this paper we extend the Zemanek's characterization of the Browder spectrum for a commuting n-tuple operators in $L(H)$ and show that if $T = (T_1, \cdots, T_n)$ is Browder then there exists an n-tuple $K = (K_1, \cdots, K_n)$ of compact operators and an invertible commuting n-tuple $(S_1, \cdots, S_n)$ for which $T = S + K$ and $S_i K_j = K_j S_i$ for all $1 \leq i, j \leq n$.

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ON n-TUPLES OF TENSOR PRODUCTS OF p-HYPONORMAL OPERATORS

  • Duggal, B.P.;Jeon, In-Ho
    • The Pure and Applied Mathematics
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    • v.11 no.4
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    • pp.287-292
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    • 2004
  • The operator $A \; {\in} \; L(H_{i})$, the Banach algebra of bounded linear operators on the complex infinite dimensional Hilbert space $\cal H_{i}$, is said to be p-hyponormal if $(A^\ast A)^P \geq (AA^\ast)^p$ for $p\; \in \; (0,1]$. Let (equation omitted) denote the completion of (equation omitted) with respect to some crossnorm. Let $I_{i}$ be the identity operator on $H_{i}$. Letting (equation omitted), where each $A_{i}$ is p-hyponormal, it is proved that the commuting n-tuple T = ($T_1$,..., $T_{n}$) satisfies Bishop's condition ($\beta$) and that if T is Weyl then there exists a non-singular commuting n-tuple S such that T = S + F for some n-tuple F of compact operators.

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QUASI SIMILARITY AND INJECTIVE p-QUASIHYPONORMAL OPERATORS

  • Woo, Young-Jin
    • Bulletin of the Korean Mathematical Society
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    • v.42 no.3
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    • pp.653-659
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    • 2005
  • In this paper it is proved that quasisimilar n-tuples of tensor products of injective p-quasihyponormal operators have the same spectra, essential spectra and indices, respectively. And it is also proved that a Weyl n-tuple of tensor products of injective p-quasihyponormal operators can be perturbed by an n-tuple of compact operators to an invertible n-tuple.

SUPERCYCLICITY OF JOINT ISOMETRIES

  • ANSARI, MOHAMMAD;HEDAYATIAN, KARIM;KHANI-ROBATI, BAHRAM;MORADI, ABBAS
    • Bulletin of the Korean Mathematical Society
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    • v.52 no.5
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    • pp.1481-1487
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    • 2015
  • Let H be a separable complex Hilbert space. A commuting tuple $T=(T_1,{\cdots},T_n)$ of bounded linear operators on H is called a spherical isometry if $\sum_{i=1}^{n}T^*_iT_i=I$. The tuple T is called a toral isometry if each $T_i$ is an isometry. In this paper, we show that for each $n{\geq}1$ there is a supercyclic n-tuple of spherical isometries on $\mathbb{C}^n$ and there is no spherical or toral isometric tuple of operators on an infinite-dimensional Hilbert space.

Fast Image Registration Method Using N-tuple (N-tuple을 이용한 고속 영상 등록 방법)

  • Ko, Min-Sam;Kim, In-Jung
    • Proceedings of the Korean Information Science Society Conference
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    • 2008.06c
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    • pp.512-516
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    • 2008
  • 복수의 영상들 간에 존재하는 변형을 빠른 속도로 파악할 수 있는 영상 등록 방법을 제안한다. 제안하는 방법은 문자인식 및 얼굴인식 분야에서 많이 사용되는 N-tuple 방법을 영상 등록에 적용함으로써 영상간 회전 및 이동 상태를 고속으로 파악한다. 또한 특정 특징을 이용하지 않아 영상의 종류에 무관하게 적용할 수 있으며 소수점 화소 단위의 변형도 파악할 수 있다. 실험을 통해 영상 패치를 이용한 영상 등록 방법과 속도 및 정확도를 비교한 결과, 제안하는 방법이 속도와 정확도 면에서 우수함을 보였다.

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Peak-to-Average Power Ratio Reduction Using N-tuple Selective Mapping Method for MC-CDMA

  • Ali, Sajjad;Chen, Zhe;Yin, Fuliang
    • ETRI Journal
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    • v.37 no.2
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    • pp.338-347
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    • 2015
  • The multi-carrier transmission signal in Multi-Carrier Code Division Multiple Access (MC-CDMA) has a high peak-to-average power ratio (PAPR), which results in nonlinear distortion and deteriorative system performance. An n-tuple selective mapping method is proposed to reduce the PAPR, in this paper. This method generates $2^n$ sequences of an original data sequence by adding n-tuple of n PAPR control bits to it followed by an interleaver and error-control code (ECC) to reduce its PAPR. The convolutional, Golay, and Hamming codes are used as ECCs in the proposed scheme. The proposed method uses different numbers of the n PAPR control bits to accomplish a noteworthy PAPR reduction and also avoids the need for a side-information transmission. The simulation results authenticate the effectiveness of the proposed method.

THE EXTENDIBILITY OF DIOPHANTINE PAIRS WITH FIBONACCI NUMBERS AND SOME CONDITIONS

  • Park, Jinseo
    • Journal of the Chungcheong Mathematical Society
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    • v.34 no.3
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    • pp.209-219
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    • 2021
  • A set {a1, a2, ⋯ , am} of positive integers is called a Diophantine m-tuple if aiaj + 1 is a perfect square for all 1 ≤ i < j ≤ m. Let Fn be the nth Fibonacci number which is defined by F0 = 0, F1 = 1 and Fn+2 = Fn+1 + Fn. In this paper, we find the extendibility of Diophantine pairs {F2k, b} with some conditions.

SUPERCYCLICITY OF ℓp-SPHERICAL AND TORAL ISOMETRIES ON BANACH SPACES

  • Ansari, Mohammad;Hedayatian, Karim;Khani-Robati, Bahram
    • Communications of the Korean Mathematical Society
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    • v.32 no.3
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    • pp.653-659
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    • 2017
  • Let $p{\geq}1$ be a real number. A tuple $T=(T_1,{\ldots},T_n)$ of commuting bounded linear operators on a Banach space X is called an ${\ell}^p$-spherical isometry if ${\sum_{i=1}^{n}}{\parallel}T_ix{\parallel}^p={\parallel}x{\parallel}^p$ for all $x{\in}X$. The tuple T is called a toral isometry if each Ti is an isometry. By a result of Ansari, Hedayatian, Khani-Robati and Moradi, for every $n{\geq}1$, there is a supercyclic ${\ell}^2$-spherical isometric n-tuple on ${\mathbb{C}}^n$ but there is no supercyclic ${\ell}^2$-spherical isometry on an infinite-dimensional Hilbert space. In this article, we investigate the supercyclicity of ${\ell}^p$-spherical isometries and toral isometries on Banach spaces. Also, we introduce the notion of semicommutative tuples and we show that the Banach spaces ${\ell}^p$ ($1{\leq}p$ < ${\infty}$) support supercyclic ${\ell}^p$-spherical isometric semi-commutative tuples. As a result, all separable infinite-dimensional complex Hilbert spaces support supercyclic spherical isometric semi-commutative tuples.