Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Search Results: 1 - 10 of 1713 matches for " Serra "
All listed articles are free for downloading (OA Articles)
Page 1 /1713
Display every page Item
Optimum Shape of High Speed Impactor for Concrete Targets Using PSOA Heuristic  [PDF]
Francesco Ragnedda, Mauro Serra
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.24035
Abstract: The present paper deals with the optimum shape design of an absolutely rigid impactor which penetrates into a semi-infinite concrete shield. The objective function to maximize is the depth of penetration (DOP for short) of the impactor; in the case of impactors with axisymmetric shapes DOP is calculated using formulas obtained by Ben-Dor et al. [1-3] with the method of local variations [4] and based on the mechanical model proposed by Forrestal and Tzou [5]. In the present paper we show that using a different class of admissible functions, more general than the axisymmetric one, better results can be obtained. To solve the formulated optimization problem we used a custom version of the particle swarm optimization method (briefly denoted by PSOA), a very recent numerical optimization algorithm of guided random global search. Numerical results show the optimal shape for various types of shields and corresponding DOP; some Ben-Dor et al. [1-3] results are compared to solutions obtained.
A Process for Extracting Non-Taxonomic Relationships of Ontologies from Text  [PDF]
Ivo Serra, Rosario Girardi
Intelligent Information Management (IIM) , 2011, DOI: 10.4236/iim.2011.34014
Abstract: Manual construction of ontologies by domain experts and knowledge engineers is an expensive and time consuming task so, automatic and/or semiautomatic approaches are needed. Ontology learning looks for identifying ontology elements like non-taxonomic relationships from information sources. These relationships correspond to slots in a frame-based ontology. This article proposes an initial process for semiautomatic extraction of non-taxonomic relationships of ontologies from textual sources. It uses Natural Language Processing (NLP) techniques to identify good candidates of non-taxonomic relationships and a data mining technique to suggest their possible best level in the ontology hierarchy. Once the extraction of these relationships is essentially a retrieval task, the metrics of this field like recall, precision and f-measure are used to perform evaluation.
à luz da tragédia: édipo e o apotropaico
Serra, Ordep;
Mana , 2005, DOI: 10.1590/S0104-93132005000200009
Abstract: focusing mainly on the sophoclean tragedies oedipus rex and oedipus at colonnus, but also considering other versions of the oedipus myth and some of the iconographic documents relating to it, this article looks to show that the apotropaic element plays an important role in this mythic context. it suggests that the beliefs and practices through which the apotropaic value is expressed are rooted in the deepest grounds of the greek weltanschauung and related to conceptions of fate and the basic categories of greek religious thought. although many studies usually restrict its operation to this circle, the article argues that magic is just one of the fields in which the apotropaic code is expressed, and that the interpretation of this code requires the consideration of other discourses and the analysis of other aspects of greek culture. in theatrical presentations of the oedipus tale, the tragedy reveals the deepest meaning of the apotropaic with singular clarity.
Una lectura crítica de la reforma electoral en México a raíz de la elección de 2006
Serra, Gilles;
Política y gobierno , 2009,
Abstract: following the 2006 post-electoral crisis, important changes were made to the constitution and several secondary laws in mexico. the goal of this essay is to analyze four problems derived from this new legislation: 1) a weakened autonomy of the federal electoral institute, 2) a scarcity of information in the political debate, 3) the hegemony of party elites, and 4) the uncertainty in case of contested elections. based on a detailed reading of the new norms, this essay documents such problems and discusses their potential impact in mexico's democratic process. we propose three new reforms: primary elections, runoff elections, and direct election of members of the electoral institute.
Os pilares da estratégia: Estudo de caso de cinco empresas líderes
Revista Portuguesa e Brasileira de Gest?o , 2007,
Abstract: the development of strategy studies along the late 50 years attempted to guide the organizational search for competitive advantage. several authors defined taxonomies for strategy schools of thought after mintzberg critics to the classical use of strategic planning in the 1970?s. from their work, generally speaking, emerge the evolutionary and complementary character of the schools of thought, or the integration of their concepts. this work presents new dimensions named the four pillars of strategy: leader and executive team; strategic focus; bet (risk-taking); and resources support. these dimensions or elements were identified from classical case studies originated from literature. they were considered complementary and interdependent elements that sustain the success of an organization.
Maus Fígados: A constru??o social da tomada de decis?o médica
Sociologia, Problemas e Práticas , 2008,
Abstract: the objective of this article is to analyse and discuss the medical decision-making processes surrounding access by waiting-list patients to a liver transplant. on the basis of an ethnographic study that took place in a specialised hospital unit, the most significant moments in the medical decision-making are selected, showing the complex negotiation processes among the different fields of medical expertise in attendance. the most recent sociological approaches, which fall within the area of social constructivism, constitute the basis of the analytical model proposed for the study of medical decision-making in the present study.
Rese a: El Libro de los Pasajes de Walter Benjamin
Francisco Serra
Foro Interno : Anuario de Teoría Política , 2006,
Crítica de libros - Book Critiques: Bonnie Honig, Emergency Politics: Paradox, Law, Democracy, Princeton University Press, Princeton, Oxford, 2009.
Paz Serra
Foro Interno : Anuario de Teoría Política , 2010,
L'administració electrònica i la gestió de documents
Serra, Jordi
BiD : Textos Universitaris de Biblioteconomia i Documentació , 2003,
Abstract: Els projectes d administració electrònica són actualment el principal factor de canvi de les organitzacions públiques. Aquest canvi, que es pot considerar imparable, té implicacions importants pel que fa a la gestió i la conservació dels documents administratius generats per les tramitacions electròniques. Aquest article analitza la problemàtica metodològica, legal i cultural que es deriva de la inclusió del paradigma arxivístic en els projectes d administració electrònica, i també les conseqüències que pot tenir per als arxius. Finalment, proposa un conjunt de solucions metodològiques per identificar els documents electrònics amb valor evidencial, determinar-ne el cicle de vida, definir una política de preservació i crear un arxiu digital.The projects dealing with e-government are currently the principal factor in instigating the changes taking place within the public administration. This change, which is considered unstoppable, has important implications regarding the management and conservation of administrative documents generated by electronic transactions. This article analyses the methodological, legal and cultural challenges that come about when the archives paradigm is included within e-government projects and also the consequences that this may have on the archives themselves. In conclusion the author proposes a set of methodological solutions for identifying those electronic documents with evidential value, determining their life cycle, defining a preservation policy and creating a digital archive.Los proyectos de administración electrónica son actualmente el principal factor de cambio de las organizaciones públicas. Este cambio, que se puede considerar imparable, tiene implicaciones importantes en lo que respecta a la gestión y a la conservación de los documentos administrativos generados por las tramitaciones electrónicas. Este artículo analiza la problemática metodológica, legal y cultural que se deriva de la inclusión del paradigma archivístico en los proyectos de administración electrónica, y también las consecuencias que puede tener para los archivos. Finalmente, propone un conjunto de soluciones metodológicas para identificar los documentos electrónicos con valor evidencial, determinar su ciclo de vida, definir una política de preservación y crear un archivo digital.
Informe sobre el segon DLM-Forum on electronic records
Serra, Jordi
BiD : Textos Universitaris de Biblioteconomia i Documentació , 2000,
Page 1 /1713
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.