3,186 research outputs found
Sampling theory in abstract reproducing kernel Hilbert space
No full textLet H be a separable Hilbert space and k(t) an H-valued function on a subset Ω of the real line R such that {k(t) t ε Ω} is total in H. Then {fx:= (x, k(t))H x ε H} becomes a reproducing kernel Hilbert space (RKHS) in a natural way. Here, we develop a sampling formula for functions in this RKHS, which generalizes the well-known celebrated Whittaker-Shannon-Kotelnikov sampling formula in the Paley-Wiener space of band-limited signals. To be more precise, we develop a multi-channel sampling formula in which each channel is given a rather arbitrary sampling rate. We also discuss stability and oversampling. ？ 2007 Sampling Publishing.This work is partially supported by BK-21 project and KOSEF(R01-2006-
000-10424-0). Authors are grateful to the referee for his many valuable comments
Water Channel Experiments on a Uniform Shear Flow around a Circular Cylinder by Image Processing
No full textOne Place After Another : Site-Specific Art and Locational Identity
No full textKwon traces the development of site-specific art from the 1960s to the 1990s, examining site-specificity as a locus of the dynamic relationship between place and identity in late capitalism. The author distinguishes the more recent work from the earlier by highlighting how it points to the exhaustion of the rhetoric of political progressivism inherent in the practice. Characterising community as an inoperative spectre, Kwon calls for new models of belonging. Index. Circa 300 bibl. ref
Move over Marcus Welby, M.D. and Make Way for Managed Care: The Implications of Capitation, Gag Clauses, and Economic Credentialing
No full textThe author examines the transformative impact of managed care on the medical profession and patient-provider relationships. The article highlights the implications of capitation, gag clauses, and economic credentialing in shaping healthcare delivery and physician autonomy. Kwon argues that these practices can undermine the quality of care and patient trust, as financial incentives often prioritize cost savings over patient welfare. Through a critical analysis, the author calls for reforms to address the ethical challenges posed by managed care systems. Ultimately, the piece advocates for a healthcare model that balances economic efficiency with the fundamental principles of patient-centered care
Vector sampling expansion in Riesz bases setting and its aliasing error
No full textAbstractWe consider the multi-input multi-output (MIMO) system of vector valued band-limited signals, which are transferred through an M×N LTI (linear time invariant) system of channels. D. Seidner and M. Feder considered this vector sampling expansion (VSE) with the formal delta-method, which is a natural generalization of Papoulis' generalized sampling expansion (GSE) for single input multi-output systems. Later R. Venkataramani and Y. Bresler considered a more general MIMO sampling for multiband signals in the frame setting. In this work, we consider the VSE problem by using the Riesz basis method, which enables us to clarify obscurities in some of the previous works related to GSE and VSE problem. We obtain necessary and sufficient conditions for a VSE formula to hold as a Riesz basis expansion in the MIMO system. We also obtain an upper bound of the aliasing error which occurs when we apply the VSE formula to non-band-limited vector signals
Good stability of protocrystalline silicon multilayer solar cells against light irradiation originating from vertically regular distribution of isolated nano-sized silicon grains
No full textUnilateral partial nephrectomy with warm ischemia results in acute Hypoxia inducible factor 1-alpha (HIF-1α) and toll-like receptor 4 (TLR4) overexpression in a porcine model
No full textPurpose: Ischemia/reperfusion (I/R) during partial nephrectomy (PN) contributes to acute kidney injury (AKI), which is inaccurately assessed using existent clinical markers of renal function. We evaluated I/R-related changes in expression in hypoxia inducible factor 1α (HIF-1α) and toll-like receptor 4 (TLR4), within kidney tissue and peripheral blood leukocytes (PBL) in a porcine model of PN.
Materials and Methods: Three adult pigs each underwent unilateral renal hilar cross clamping for 180 min followed by a 15 min reperfusion. The contralateral kidney served as control. Biopsies of clamped kidneys were obtained at baseline (time 0), every 60 min during the hypoxic phase, and post-reperfusion. Control kidneys were biopsied once at 180 min. Peripheral blood was sampled at time 0, every 30 min during the hypoxic phase, and post-reperfusion. HIF-1α and TLR4 expression in kidney tissue and PBL were analyzed by Western blotting. I/R-related histological changes were assessed.
Results: Expression of HIF-1α in clamped kidneys and PBL was below detection level at baseline, rising to detectable levels after 60 min of hypoxia, and continuing to rise throughout the hypoxic and reperfusion phases. Expression of TLR-4 in clamped kidneys followed a similar trend with initial detection after 30–60 min of hypoxia. Control kidneys exhibited no change in HIF-1α or TLR-4 expression. I/R-related histologic changes were minimal, primarily mild tubular dilatation.
Conclusions: In a porcine model of PN, HIF-1α and TLR4 exhibited robust, I/R-related increases in expression in kidney tissue and PBL. Further studies investigating these molecules as potential markers of AKI are warranted.Peer reviewe
Generalization of spontaneous imitation from nonwords to real words
No full textThis study reports that English speakers, after shadowing English-like nonwords beginning on /p/ with extended voice onset time, spontaneously shifted their subsequent reading productions of English words converging toward the shadowing targets. The extent of the imitative changes correlated positively with the speakers' declarative memory of the nonwords, but not with the lexical frequency of the produced words. These findings provide evidence for the phoneme-level abstraction in perceptually induced phonetic drifts while they further suggest that the mechanisms underlying phonetic drifts in direct shadowing, and in subsequent productions of words differing from the shadowing targets, may not be identical. (C) 2023 Author(s).Y
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