117,711 research outputs found
A Moral Revolution at Mazorra, 1899–1902
No full textChapter 1 examines the massive reconstruction effort undertaken at Mazorra at the end of the Cuban independence war. In particular, it examines the collaboration between U.S. occupying forces and Cuban liberating hero Lucas Álvarez Cerice to transform popular outrage over asylum conditions into a popular and patriotic rebuilding effort. Both groups turned Mazorra into a key nationalist icon, even as their efforts to implement a new therapeutic regimen (with particular emphasis on work as treatment) recapitulated racial and class divides.</p
Fragments of a Journey to Mazorra
No full textChapter 2 follows the unlikely pact between U.S. occupying forces and patriotic doctors through its fraying under the auspices of Cuba’s first sovereign government (1902-6) and its revival during another U.S. occupation (1906-9). As public alarm grew over a ballooning institutional population and patient death rate, Mazorra’s status as an icon of a sovereign Cuba increasingly cast doubts on the political health of that nation. Reformers, doctors, and patients all contributed to the project of unpacking what sovereignty would mean for Mazorra and Cuba.</p
Mathematical Models for the Calibration of Cameras Mounted on a Tripod Using Primitive Tracking
No full textIn this paper we present new mathematical models for video sequence calibration when cameras are mounted on a tripod. One of the main novelties is that tripod rotation center and camera projection center are not supposed to be the same. The calibration is based on the geometry of the tripod and a primitive tracking procedure which uses lines and circles as primitives. For the extraction of primitive information, we use a CART (Classification and Regression Tree). We have applied the method proposed to sport event scenarios, specifically, soccer matches. In order to illustrate its performance, it has been applied to real HD (High Definition) video sequences and some numerical experiments are shown. The quality of the camera calibration procedure is validated by inserting virtual elements in the video sequence.3113040,323Q
Signal and image restoration using shock filters and anisotropic diffusion
No full textThe authors define a new class of filters for noise elimination and edge enhancement by using shock filters and anisotropic diffusion. Some nonlinear partial differential equations used as models for these filters are studied. The authors develop recursive and unconditional stable schemes which drastically reduce the computational effort of the algorithms. A new fast recursive approach to linear Gaussian filters is also shown by using the heat equation.605590SCI
Fitting ear contour using an ovoid model
No full textEar analysis is an emergent biometric application. The main advantages are the no requirement for subject contact and acquisition without demand. To recognize a subject's ear, we aim to extract a characteristic vector from a human ear image that may subsequently be used to identify or confirm the identity of the owner. Towards this end, a new technique, combining geodesic active contours and a new ovoid model, has been developed, which can be used to compare ears in an independent way of the ear location and size.14814
A formal introduction to zero-knowledge proofs
No full textTreballs Finals de Grau de Matemàtiques, Facultat de Matemàtiques, Universitat de Barcelona, Any: 2024, Director: Bruno Mazorra i Luis Victor DieulefaitThe idea of zero-knowledge proof was first introduced by Goldwasser, Micali and Rackoff [GMR89] and has found its way to many real-world applications. The growing need for privacy in information exchange (e.g. transactions, digital signatures, commitment schemes, ...) lead to the development of proofs that yield nothing more than their validity.
We introduce the building blocks for zero-knowledge proofs through mathematical rigour, allowing the reader to gain a solid foundation to research further related topics. We explore some necessary notions of cryptography and probability, as well as computation theory by utilizing Turing machines as an automation abstraction. We delve into the theory of decision problems and the consequent classification through complexity classes, specially and . We use the concepts of repetition and interaction to prove that the decision error for languages in and can be decreased exponentially and explore the example of Graph Non-Isomorphism. We introduce the idea of zero-knowledge interactive proof systems and define some variations of its definition. We explore the example of Graph Isomorphism and conclude showing that the sequential repetition of zero-knowledge interactive proofs is indeed a zero-knowledge interactive proof
A formal introduction to zero-knowledge proofs
No full textTreballs Finals de Grau de Matemàtiques, Facultat de Matemàtiques, Universitat de Barcelona, Any: 2024, Director: Bruno Mazorra i Luis Victor DieulefaitThe idea of zero-knowledge proof was first introduced by Goldwasser, Micali and Rackoff [GMR89] and has found its way to many real-world applications. The growing need for privacy in information exchange (e.g. transactions, digital signatures, commitment schemes, ...) lead to the development of proofs that yield nothing more than their validity.
We introduce the building blocks for zero-knowledge proofs through mathematical rigour, allowing the reader to gain a solid foundation to research further related topics. We explore some necessary notions of cryptography and probability, as well as computation theory by utilizing Turing machines as an automation abstraction. We delve into the theory of decision problems and the consequent classification through complexity classes, specially and . We use the concepts of repetition and interaction to prove that the decision error for languages in and can be decreased exponentially and explore the example of Graph Non-Isomorphism. We introduce the idea of zero-knowledge interactive proof systems and define some variations of its definition. We explore the example of Graph Isomorphism and conclude showing that the sequential repetition of zero-knowledge interactive proofs is indeed a zero-knowledge interactive proof
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Daily global solar radiation modeling for Gran Canaria Island
No full textThe main aim of this paper is the daily global solar radiation modeling with different estimation models for the island of Gran Canaria (Spain). The errors of those ones will be studied and, moreover, the results will be compared with a solar radiation numerical model previously developed and validated. We have tested five different models starting from the Ångström linear model. Logarithmic, exponential, cubic models, and an exponential-linear composed model have been developed. The best results were obtained with the composed model. The development of these models will allow getting accurate results far from the measurements stations.356435570,2890,527Q2Q4SCI
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
- …
