• 제목/요약/키워드: Lie group

검색결과 232건 처리시간 0.021초

Lie-군상에서의 Bezier 곡선과 Bezier곡면의 생성방법 (Generation Method of Bezier Curves and Surfaces on Lie Groups)

  • 임장환;김태은
    • 정보처리학회논문지A
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    • 제9A권1호
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    • pp.99-104
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    • 2002
  • 본 논문에서는 벡터공간 $R_n$에서 정의된 Bezier곡선과 Bezier곡면을 Lie군(Lie group)에서 확장하는 일반적인 새로운 생성방법을 제시한다. 이 방법에 의해서 생성된 Bezier곡선과 Bezier곡면은 Lie군의 성질에 의해서 미분 가능한 구조를 갖는다. 이 방법은 공간상에서 움직이는 물체에 대한 부드러운 움직임을 묘사하거나 궤도생성에 사용할 수 있다.

Lie Group Theory에 기준한 Lead-Lag 전력계통안정화장치 (Lie Group Theory based Lead-Lag Power System Stabilizer)

  • 이상성;이선영;박종근;문승일;윤용태
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 추계학술대회 논문집 전력기술부문
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    • pp.183-186
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    • 2004
  • 본 논문에서는 Lie Group 및 Lie Transformation의 수학적인 근원을 분석하고 이를 비선형 제어기에 제공하였다. 제어기의 구성형태는 Lead-Lag와 LQR 관측기를 결합한 혼합형 비선형 전력계통안정화장치(NPSS)이다. 이 분석에 사용된 제어기는 첫째로 기존의 PSS type인 Lead-Lag 형태의 선형화 제어기이다. 둘째로 제안된 제어기는 Lie group theory를 적용하여 이를 상태변수에 반영한 Lead-Lag와 LQR 관측기를 결합한 것이다. 제안된 혼합형 비선형 전력계통안정화장치(NPSS)의 효과분석은 MATLAB을 이용하였다. 분석모델은 1기 4차 비선형 전력계통의 모델에 적용하였다.

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HARMONIC MAPS BETWEEN THE GROUP OF AUTOMORPHISMS OF THE QUATERNION ALGEBRA

  • Kim, Pu-Young;Park, Joon-Sik;Pyo, Yong-Soo
    • 충청수학회지
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    • 제25권2호
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    • pp.331-339
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    • 2012
  • In this paper, let Q be the real quaternion algebra which consists of all quaternionic numbers, and let G be the Lie group of all automorphisms of the algebra Q. Assume that g is an arbitrary given left invariant Riemannian metric on the Lie group G. Then, we obtain a necessary and sufficient condition for an automorphism of the group G to be harmonic.

LIE SYMMETRY ANALYSIS AND INVARIANT SOLUTIONS OF THE GENERALIZED FIFTH-ORDER KDV EQUATION WITH VARIABLE COEFFICIENTS

  • Wang, Gang-Wei;Liu, Xi-Qiang;Zhang, Ying-Yuan
    • Journal of applied mathematics & informatics
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    • 제31권1_2호
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    • pp.229-239
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    • 2013
  • This paper studies the generalized fifth-order KdV equation with variable coefficients using Lie symmetry methods.Lie group classification with respect to the time dependent coefficients is performed. Then we get the similarity reductions using the symmetry and give some exact solutions.

LIE BIALGEBRAS ARISING FROM POISSON BIALGEBRAS

  • Oh, Sei-Qwon;Cho, Eun-Hee
    • 대한수학회지
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    • 제47권4호
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    • pp.705-718
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    • 2010
  • It gives a method to obtain a natural Lie bialgebra from a Poisson bialgebra by an algebraic point of view. Let g be a coboundary Lie bialgebra associated to a Poission Lie group G. As an application, we obtain a Lie bialgebra from a sub-Poisson bialgebra of the restricted dual of the universal enveloping algebra U(g).

AUTOMORPHISMS OF UNIFORM LATTICES OF NILPOTENT LIE GROUPS UP TO DIMENSION FOUR

  • Lee, Jong Bum;Lee, Sang Rae
    • 대한수학회논문집
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    • 제35권2호
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    • pp.653-666
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    • 2020
  • In this paper, when G is a connected and simply connected nilpotent Lie group of dimension less than or equal to four, we study the uniform lattices Γ of G up to isomorphism and then we study the structure of the automorphism group Aut(Γ) of Γ from the viewpoint of splitting as a natural extension.

Representation Theory of the Lie Group T3 and Three Index Bessel Functions

  • Pathan, Mahmood Ahmad;Shahwan, Mohannad Jamal Said
    • Kyungpook Mathematical Journal
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    • 제53권1호
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    • pp.143-148
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    • 2013
  • The theory of generalized Bessel functions is reformulated within the framework of an operational formalism using the multiplier representation of the Lie group $T_3$ as suggested by Miller. This point of view provides more efficient tools which allow the derivation of generating functions of generalized Bessel functions. A few special cases of interest are also discussed.

UNIT KILLING VECTORS AND HOMOGENEOUS GEODESICS ON SOME LIE GROUPS

  • Yi, Seunghun
    • 충청수학회지
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    • 제19권3호
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    • pp.291-297
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    • 2006
  • We find unit Killing vectors and homogeneous geodesics on the Lie group with Lie algebra $\mathbf{a}{\oplus}_p\mathbf{r}$, where $\mathbf{a}$ and $\mathbf{r}$ are abelian Lie algebra of dimension n and 1, respectively.

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The Real Rank of CCR C*-Algebra

  • Sudo, Takahiro
    • Kyungpook Mathematical Journal
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    • 제48권2호
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    • pp.223-232
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    • 2008
  • We estimate the real rank of CCR C*-algebras under some assumptions. A applications we determine the real rank of the reduced group C*-algebras of non-compac connected, semi-simple and reductive Lie groups and that of the group C*-algebras of connected nilpotent Lie groups.