نتایج جستجو برای: 0 dimensional frames

تعداد نتایج: 996223  

2011
Péter Balázs Monika Dörfler Florent Jaillet Nicki Holighaus Gino Angelo M. Velasco

Signal analysis with classical Gabor frames leads to a fixed time-frequency resolution over the whole time-frequency plane. To overcome the limitations imposed by this rigidity, we propose an extension of Gabor theory that leads to the construction of frames with time-frequency resolution changing over time or frequency. We describe the construction of the resulting nonstationary Gabor frames a...

Journal: :IJWMIP 2005
Yonina C. Eldar Tobias Werther

We introduce a general framework for consistent linear reconstruction in infinitedimensional Hilbert spaces. We study stable reconstructions in terms of Riesz bases and frames, and generalize the notion of oblique dual frames to infinite-dimensional frames. As we show, the linear reconstruction scheme coincides with the so-called oblique projection, which turns into an ordinary orthogonal proje...

Journal: :CoRR 2012
Gitta Kutyniok Kasso A. Okoudjou Friedrich Philipp Elizabeth K. Tuley

Tight frames can be characterized as those frames which possess optimal numerical stability properties. In this paper, we consider the question of modifying a general frame to generate a tight frame by rescaling its frame vectors; a process which can also be regarded as perfect preconditioning of a frame by a diagonal operator. A frame is called scalable, if such a diagonal operator exists. We ...

2016
Ben Adcock Daan Huybrechs

This document contains supplementary materials for the paper Frames and numerical approximation by B. Adcock & D. Huybrechs [3]. SM1 Example 1. Fourier frames for complex geometries Consider the frame (3.1) over a domain Ω ⊆ (−1, 1)d. SM1.1 The kernel of G We first characterize the kernel of the Gram operator: Proposition SM1.1. Let G be the Gram operator (2.7) of the frame (3.1). Then Ker(G) =...

Journal: :Journal of Structural and Construction Engineering (Transactions of AIJ) 2005

2016
Yon Kwon Ihn Bum-Soo Kim Jun Soo Byun Sang Hyun Suh Yoo Dong Won Deok Hee Lee Byung Moon Kim Young Soo Kim Pyong Jeon Chang-Woo Ryu Sang-il Suh Dae Seob Choi See Sung Choi Jin Wook Choi Hyuk Won Chang Jae-Wook Lee Sang Heum Kim Young Jun Lee Shang Hun Shin Soo Mee Lim Woong Yoon Hae Woong Jeong Moon Hee Han

PURPOSE To assess patient radiation doses during cerebral angiography and embolization of intracranial aneurysms across multi-centers and propose a diagnostic reference level (DRL). MATERIALS AND METHODS We studied a sample of 490 diagnostic and 371 therapeutic procedures for intracranial aneurysms, which were performed at 23 hospitals in Korea in 2015. Parameters including dose-area product ...

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