• 제목/요약/키워드: U/F

검색결과 1,920건 처리시간 0.031초

Minimum Distance Estimation Based On The Kernels For U-Statistics

  • Park, Hyo-Il
    • Journal of the Korean Statistical Society
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    • 제27권1호
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    • pp.113-132
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    • 1998
  • In this paper, we consider a minimum distance (M.D.) estimation based on kernels for U-statistics. We use Cramer-von Mises type distance function which measures the discrepancy between U-empirical distribution function(d.f.) and modeled d.f. of kernel. In the distance function, we allow various integrating measures, which can be finite, $\sigma$-finite or discrete. Then we derive the asymptotic normality and study the qualitative robustness of M. D. estimates.

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WEIGHTED COMPOSITION OPERATORS FROM F(p, q, s) INTO LOGARITHMIC BLOCH SPACE

  • Ye, Shanli
    • 대한수학회지
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    • 제45권4호
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    • pp.977-991
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    • 2008
  • We characterize the boundedness and compactness of the weighted composition operator $uC_{\psi}$ from the general function space F(p, q, s) into the logarithmic Bloch space ${\beta}_L$ on the unit disk. Some necessary and sufficient conditions are given for which $uC_{\psi}$ is a bounded or a compact operator from F(p,q,s), $F_0$(p,q,s) into ${\beta}_L$, ${\beta}_L^0$ respectively.

독일어 교재에 등장하는 '확신'-화법어의 양상 고찰 (Pragmatische Analyse sprachlicher $Ausdr\"{u}cke$ der $\"{U}berzeugtheit-Modalit\"{a}t$ in den $Lehrb\"{u}chern\;f\"{u}r$ Deutsch als Fremdsprache)

  • 조국현
    • 한국독어학회지:독어학
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    • 제3집
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    • pp.253-276
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    • 2001
  • In dieser vorliegenden Arbeit wird. versucht, sprachlicher Ausdrucke der $\"{U}berzeugtheit-Modalit\"{a}t$ in den Lehrblichern $f\"{u}r$ Deutsch als Fremdsprache unter dem Aspekt der Pragmatik zu analysieren. Als Untersuchungsmaterial werden zwei $Lehrb\"{u}cher\;gew\"{a}hlt$, die in einem Deutschunterricht an der Hankuk $Universit\"{a}t\;f\"{u}r$ Fremdsprachen benutzt worden ist oder benutzt wird: Deutsche Sprachlehre $f\"{u}r\;Ausl\"{a}nder$(kurz: DSA) und Aufbaukurs Deutsch (kurz: AD). Das erstere gilt als grammatikbezogen, das zweite als kommunikationsorientiert. In AD kommen dialogische und monologische Texte im $Verh\"{a}ltnis$ 5 zu 3 vor, wahrend in DSA monologische Texte $70\%$ aller Texte betragen. Es ist zu beachten, dass DSA relativ mehr asymmetrische Dialoge enthalt, in denen ein $Gesp\"{a}chsteilnehmer$ auf Kenntnisse, $F\"{a}higkeiten$ oder Hilfe eines anderen angewiesen ist. Jeder $Gesp\"{a}chsteilnehmer\;\"{u}bemimmt$ eine konventionell festgelegte Rolle. Asymmetrische Dialogen sind in der Regel standardisierte Dialogformen wie Wegauskunft oder Verkaufsgesprach. Im Vergleich zu DSA sind 25 von 29 Dialogen in AD symmetrisch. Der symmetrische Dialog ist ein Dialog, dessen Teilnehmer sich in 'gleichberechtigter' Position befinden. In symmetrischen Dialogen versucht z.B. ein $Gesp\"{a}chsteilnehmer$ einen anderen zu $\"{u}berzeugen$, um seine eigenen Interessen durchzusetzen oder zwei (oder mehrere)$Gesp\"{a}chsteilnehmer\;bem\"{u}hen$ sich zusammen, urn ein gemeinsames Ziel zu erreichen. Bei der empirischen Untersuchung von DSA und AD $l\"{a}sst$ sich feststellen, dass modale sprachliche Mittel, die zum Ausdruck der $\"{U}berzeugtheit\;dienen,\;h\"{a}ufig$in symmetrischen Dialogen vorkommen. Ein solcher Ausdruck stellt em kommunikativ relevantes Element spraehlieher Handlung dar. Bei der $\"{U}berzeugtheit-Modalit\"{a}t$ handelt es sich $n\"{a}mlich$ um den Grad der $\"{U}berzeugtheit$ des Spreehers, also um die sprecherseitige $Einsch\"{a}tzung$ des Geltungsgrad des Inhaltes einer spraehliehen $\"{A}u{\ss}erung$ in ihrer Beziehung zur objektiven Realitat. In einer sprachliehen $\"{A}u{\ss}erung\;dr\"{u}ckt$ man seine Gewissheit, Ungewissheit, Vermutung, seinen Zweifel aus. Aus der Analyse dialogiseher Texte ergibt sich, dass sprachliche Ausdrucke der $\"{U}berzeugtheit-Modalit\"{a}t$ in AD viel $h\"{a}ufiger\;und\;vielf\"{a}ltiger$ vorkommen, als in DSA.

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ON DISCONTINUOUS ELLIPTIC PROBLEMS INVOLVING THE FRACTIONAL p-LAPLACIAN IN ℝN

  • Kim, In Hyoun;Kim, Yun-Ho;Park, Kisoeb
    • 대한수학회보
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    • 제55권6호
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    • pp.1869-1889
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    • 2018
  • We are concerned with the following fractional p-Laplacian inclusion: $$(-{\Delta})^s_pu+V(x){\mid}u{\mid}^{p-2}u{\in}{\lambda}[{\underline{f}}(x,u(x)),\;{\bar{f}}(s,u(x))]$$ in ${\mathbb{R}}^N$, where $(-{\Delta})^s_p$ is the fractional p-Laplacian operator, 0 < s < 1 < p < $+{\infty}$, sp < N, and $f:{\mathbb{R}}^N{\times}{\mathbb{R}}{\rightarrow}{\mathbb{R}}$ is measurable with respect to each variable separately. We show that our problem with the discontinuous nonlinearity f admits at least one or two nontrivial weak solutions. In order to do this, the main tool is the Berkovits-Tienari degree theory for weakly upper semicontinuous set-valued operators. In addition, our main assertions continue to hold when $(-{\Delta})^s_pu$ is replaced by any non-local integro-differential operator.

Integral operators that preserve the subordination

  • Bulboaca, Teodor
    • 대한수학회보
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    • 제34권4호
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    • pp.627-636
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    • 1997
  • Let $H(U)$ be the space of all analytic functions in the unit disk $U$ and let $K \subset H(U)$. For the operator $A_{\beta,\gamma} : K \longrightarrow H(U)$ defined by $$ A_{\beta,\gamma}(f)(z) = [\frac{z^\gamma}{\beta + \gamma} \int_{0}^{z} f^\beta (t)t^{\gamma-1} dt]^{1/\beta} $$ and $\beta,\gamma \in C$, we determined conditions on g(z), $\beta and \gamma$ such that $$ z[\frac{z}{f(z)]^\beta \prec z[\frac{z}{g(z)]^\beta implies z[\frac{z}{A_{\beta,\gamma}(f)(z)]^\beta \prec z[\frac{z}{A_{\beta,\gamma}(g)(z)]^\beta $$ and we presented some particular cases of our main result.

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비선형 이산 시간 시스템 $x_{k+1}=G_{u_k}{o}F{(x_k)}$ 의 선형화에 관하여 (On the Linearization of the Discrete-time Nonlinear Systems, $x_{k+1}=G_{u_k}{o}F{(x_k)}$)

  • 남광희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(I)
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    • pp.125-128
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    • 1987
  • We investigate the feedback linearizability of nonlinear discrete-time system s of a specific form, $x_k=G_{u_k}oF(x_k)$ where F is a diffeomorphism and [$G_{u_k}$] forms an one parameter group of diffeomorphisms. This structure represents a class of systems which are state equivalent to linear ones and approximates the sampled data model of a continuous-time system. It is also considered a relationship between linearizability and discretization.

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ON THE HYERS-ULAM-RASSIAS STABILITY OF THE JENSEN EQUATION IN DISTRIBUTIONS

  • Lee, Eun-Gu;Chung, Jae-Young
    • 대한수학회논문집
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    • 제26권2호
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    • pp.261-271
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    • 2011
  • We consider the Hyers-Ulam-Rassias stability problem ${\parallel}2u{\circ}\frac{A}{2}-u{\circ}P_1-u{\circ}P_2{\parallel}{\leq}{\varepsilon}({\mid}x{\mid}^p+{\mid}y{\mid}^p)$, $x,y{\in}{\mathbb{R}}^n$ for the Schwartz distributions u, which is a distributional version of the Hyers-Ulam-Rassias stability problem of the Jensen functional equation ${\mid}2f(\frac{x+y}{2})-f(x)-F(y){\mid}{\leq}{\varepsilon}({\mid}x{\mid}^p+{\mid}y{\mid}^p)$, $x,y{\in}{\mathbb{R}}^n$ for the function f : ${\mathbb{R}}^n{\rightarrow}{\mathbb{C}}$.

MULTIPLICITY OF POSITIVE SOLUTIONS OF A SCHRÖDINGER-TYPE ELLIPTIC EQUATION

  • Eunkyung Ko
    • East Asian mathematical journal
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    • 제40권3호
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    • pp.295-306
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    • 2024
  • We investigate the existence of multiple positive solutions of the following elliptic equation with a Schrödinger-type term: $$\begin{cases}-{\Delta}u+V(x)u={\lambda}f(u){\quad} x{\in}{\Omega},\\{\qquad}{\qquad}{\quad}u=0, {\qquad}\;x{\in}\partial{\Omega},\end{cases}$$, where 0 ∈ Ω is a bounded domain in ℝN , N ≥ 1, with a smooth boundary ∂Ω, f ∈ C[0, ∞), V ∈ L(Ω) and λ is a positive parameter. In particular, when f(s) > 0 for 0 ≤ s < σ and f(s) < 0 for s > σ, we establish the existence of at least three positive solutions for a certain range of λ by using the method of sub and supersolutions.

EXISTENCE OF POSITIVE SOLUTIONS FOR SINGULAR IMPULSIVE DIFFERENTIAL EQUATIONS WITH INTEGRAL BOUNDARY CONDITIONS

  • Miao, Chunmei;Ge, Weigao;Zhang, Zhaojun
    • 한국수학교육학회지시리즈B:순수및응용수학
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    • 제21권3호
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    • pp.147-163
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    • 2014
  • In this paper, we study the existence of positive solutions for singular impulsive differential equations with integral boundary conditions $$\{u^{{\prime}{\prime}}(t)+q(t)f(t,u(t),u^{\prime}(t))=0,\;t{\in}\mathbb{J}^{\prime},\\{\Delta}u(t_k)=I_k(u(t_k),u^{\prime}(t_k)),\;k=1,2,{\cdots},p,\\{\Delta}u^{\prime}(t_k)=-L_k(u(t_k),u^{\prime}(t_k)),\;k=1,2,{\cdots},p,\\u=(0)={\int}_{0}^{1}g(t)u(t)dt,\;u^{\prime}=0,$$) where the nonlinearity f(t, u, v) may be singular at v = 0. The proof is based on the theory of Leray-Schauder degree, together with a truncation technique. Some recent results in the literature are generalized and improved.