81,387 research outputs found
Groups of banded matrices with banded inverses
No full textA product A=F[subscript 1]...F[subscript N] of invertible block-diagonal matrices will be banded with a banded
inverse. We establish this factorization with the number N controlled by the bandwidths w
and not by the matrix size n. When A is an orthogonal matrix, or a permutation, or banded
plus finite rank, the factors F[subscript i] have w=1 and generate that corresponding group. In the
case of infinite matrices, conjectures remain open
Fast transforms: Banded matrices with banded inverses
No full textIt is unusual for both A and A[superscript -1] to be banded—but this can be a valuable property in applications. Block-diagonal matrices F are the simplest examples; wavelet transforms are more subtle. We show that every example can be factored into A = F[subscript 1]…F[subscript N] where N is controlled by the bandwidths of A and A[superscript -1} (but not by their size, so this extends to infinite matrices and leads to new matrix groups)
Service-Interoperabilität in Ubiquitous Computing Umgebungen
No full textDie vorliegende Arbeit präsentiert einen Ansatz zur Modellierung, Spezifikation und Auswertung von kontextuellem Wissen. Dieser Ansatz ermöglicht die Bestimmung kontextueller Interoperabilität von Diensten in Ubiquitous Computing Umgebungen. Grundlegend ist dabei das Konzept der kontextadaptiven Dienstnutzung, die sowohl die kontextadaptive Dienstauswahl
als auch Dienstausführung umfaßt. Kern des Ansatzes ist die Verwendung von Ontologien. Dadurch können einerseits die Konzepte des Modells, sowie darauf basierende Unterkonzepte und Fakten in einheitlicher Weise als verteiltes, kontextuelles Wissen definiert werden. Andererseits können ontologische Reasoner gewinnbringend zur Auswertung von kontextuellem Wissen eingesetzt werden. Das Modell und verschiedene Integrationselemente werden mit ausgewählten Ontologiesprachen umgesetzt. Daraus resultiert unter dem Oberbegriff der Context Ontology Language eine nicht monolithische Sprache zur Spezifikation von kontextuellem Wissen und dessen Integration
in verteilte Dienstumgebungen. Kontextuelle Interoperabilität zwischen den an einer Dienstinteraktion beteiligten Komponenten kann durch Anwendung dieser Sprache erreicht werden. Mit ihr erstellte Spezifikationen bilden insbesondere eine Grundlage zur Bestimmung von kontextueller Kompatibilität und
Ersetzbarkeit. Dies wird u.a. detailliert am Beispiel kontextbasierter Service Handover vorgestellt. Darüber hinaus werden weitere Anwendungsmöglichkeiten der Sprache z.B. im Bereich der Zusammenführung der Interoperabilitätsebenen oder als Meta-Sprache zur Abbildung
zwischen verschiedenen Kontextmodellen vorgestellt
Maximum flows and minimum cuts in the plane
No full textA continuous maximum flow problem finds the largest t such that div v = t F(x, y) is possible with a capacity constraint ||(v[subscript 1], v[subscript 2])|| ≤ c(x, y). The dual problem finds a minimum cut ∂ S which is filled to capacity by the flow through it. This model problem has found increasing application in medical imaging, and the theory continues to develop (along with new algorithms). Remaining difficulties include explicit streamlines for the maximum flow, and constraints that are analogous to a directed graph. Keywords: Maximum flow; Minimum cut; Capacity constraint; Cheege
Restorative justice in the Australian criminal justice system
No full textAbstract: In 2001, Heather Strang prepared a report for the Criminology Research Council summarising restorative justice programs in Australia. Since that time, restorative justice practices have become mainstream in Australian juvenile justice and have been extended for use with adult offenders. The question, ‘does it work?’ is asked of all interventions in the criminal justice field and is most often answered by assessing the impact on reoffending. On this point, the evidence for restorative justice remains mixed. However, the literature is replete with reports of high levels of victim satisfaction and feelings that the process is fair. Further, while some significant issues remain, research conducted to date consistently demonstrates that restorative justice programs work at least as well as formal criminal justice responses. The purpose of this report is twofold; to describe and provide an overview of restorative justice programs in Australia in order to build on Heather Strang’s 2001 review and provide an assessment of current and future issues facing restorative justice practice
Results of the Heart Protection Study: Can we still assume a class effect?
No full textStatins share several common features including the mechanism of action, i.e. inhibition of HMG-CoA reductase, as well as LDL-cholesterol (LDL-C) and triglyceride lowering properties. However, statins show minor differences in chemical structure, lipophilicity that could translate into a different pharmacological properties. For example, simvastatin exerted a more favorable effect on HDL-C levels than did atorvastatin when higher doses of the two drugs were compared. Finally, the major considerations to chose between statins for CVD patient therapy include clinical benefits and safety (i.e. evidence-based medicine). Primary prevention trials with pravastatins and lovastatin and secondary prevention trials with pravastatin, fluvastatin and simvastatin have established the clinical benefits of statins. In addition, HPS study was designed to investigate the benefits of simvastatin 40 mg in a broad range of patients at high risk for heart disease including women, the elderly and those with a history of hearth attacks, diabetes, hypertension or vascular disease. The results show the ability of simvastatin to reduce all causes of mortality, vascular death and cardiovascular morbidity. The trial also confirms the safety of simvastatin 40 mg although 60% of patients were receiving additional pharmacological treatment. In summary, it appears that statins are not the same and the choice of the more appropriate statin in high-risk patients should be driven by the evidence-based medicine both in terms of safety and efficacy
A Relational Unsupervised Approach to Author Identification
No full textIn the last decades speaking and writing habits have changed.
Many works faced the author identification task by exploiting frequencybased
approaches, numeric techniques or writing style analysis. Following
the last approach we propose a technique for author identification
based on First-Order Logic. Specifically, we translate the complex data
represented by natural language text to complex (relational) patterns
that represent the writing style of an author. Then, we model an author
as the result of clustering the relational descriptions associated to the
sentences. The underlying idea is that such a model can express the typical
way in which an author composes the sentences in his writings. So,
if we can map such writing habits from the unknown-author model to
the known-author model, we can conclude that the author is the same.
Preliminary results are promising and the approach seems viable in real
contexts since it does not need a training phase and performs well also
with short texts
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
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