1,721,129 research outputs found
Some matrix nearness problems suggested by Tikhonov regularization
Full text linkThe numerical solution of linear discrete ill-posed problems typically requires
regularization, i.e., replacement of the available ill-conditioned problem by a nearby
better conditioned one. The most popular regularization methods for problems of small to
moderate size are Tikhonov regularization and truncated singular value decomposition
(TSVD). By considering matrix nearness problems related to Tikhonov regularization,
several novel regularization methods are derived. These methods share properties with both
Tikhonov regularization and TSVD, and can give approximate solutions of higher quality
than either one of these methods
Waste Crime
No full textWhile many international corporations have benefited from the global economy and distribution of information, globalization has also had serious negative consequences. This important reference work offers students and general readers a critical understanding of how technology, governments, political unrest, war, and economic strife contribute to an increase in global crime. This A–Z encyclopedia covers key people, events, and organizations and includes key documents that will help readers to understand the numerous problems created by the many transnational crimes that are growing in severity and frequency around the world. Entries address perpetrators and their methods; victims; who really profits; and law enforcement responses. In addition to cyber theft and sales of weapons and narcotics, the set provides a detailed look at global crimes not typically covered, such as corruption, fraudulent medicine, illegal sports betting, organ trafficking, maritime piracy, trafficking in cultural property, and wildlife and forest crime. Although some historical events and people are included, the focus is on recent and contemporary topics
Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and their Disposal
No full textWhile many international corporations have benefited from the global economy and distribution of information, globalization has also had serious negative consequences. This important reference work offers students and general readers a critical understanding of how technology, governments, political unrest, war, and economic strife contribute to an increase in global crime. This A–Z encyclopedia covers key people, events, and organizations and includes key documents that will help readers to understand the numerous problems created by the many transnational crimes that are growing in severity and frequency around the world. Entries address perpetrators and their methods; victims; who really profits; and law enforcement responses. In addition to cyber theft and sales of weapons and narcotics, the set provides a detailed look at global crimes not typically covered, such as corruption, fraudulent medicine, illegal sports betting, organ trafficking, maritime piracy, trafficking in cultural property, and wildlife and forest crime. Although some historical events and people are included, the focus is on recent and contemporary topics
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Iterative Methods of Richardson-Lucy-type for Image Deblurring
No full textImage deconvolution problems with a symmetric point-sprea
d function arise in many areas of science and engineering. These problems often are solved by the Richardson-Lucy method, a nonlinear iterative method. We first show a convergence result for the Richardson-Lucy method. The proof sheds ligh t on why the method may
converge slowly. Subsequently, we describe an iterative active set method that imposes the same constraints on the computed solution as the Richard
son-Lucy method. Computed examples show the latter method to yield better restorations than the Richardson-Lucy method and typically require less computational effort.
Variations on the Author
Full text link“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
- …
