33,773 Hits in 1.9 sec

La Democracia Cristiana frente al régi men de Onganía . Un aborda je desde el caso tucumano

Germán Azcoaga
2012 Estudios Sociales  
Registro bibliográficoaZcoaGa, GERMÁN «La Democracia Cristiana frente al régimen de Onganía.  ... 
doi:10.14409/es.v42i1.2693 fatcat:ukgz6veo2jam7njdz4zq5kcckm


Germán Gamero Igea
2016 Los Libros de la  
doaj:0496d8e068dd4443827c87dd402aa462 fatcat:zv7kfyyr5fg6fnw7nmj5ue4zyy

FLACK: Counterexample-Guided Fault Localization for Alloy Models [article]

Guolong Zheng, ThanhVu Nguyen, Simón Gutiérrez Brida, Germán Regis, Marcelo F. Frias, Nazareno Aguirre, Hamid Bagheri
2021 arXiv   pre-print
Fault localization is a practical research topic that helps developers identify code locations that might cause bugs in a program. Most existing fault localization techniques are designed for imperative programs (e.g., C and Java) and rely on analyzing correct and incorrect executions of the program to identify suspicious statements. In this work, we introduce a fault localization approach for models written in a declarative language, where the models are not "executed," but rather converted
more » ... o a logical formula and solved using backend constraint solvers. We present FLACK, a tool that takes as input an Alloy model consisting of some violated assertion and returns a ranked list of suspicious expressions contributing to the assertion violation. The key idea is to analyze the differences between counterexamples, i.e., instances of the model that do not satisfy the assertion, and instances that do satisfy the assertion to find suspicious expressions in the input model. The experimental results show that FLACK is efficient (can handle complex, real-world Alloy models with thousand lines of code within 5 seconds), accurate (can consistently rank buggy expressions in the top 1.9\% of the suspicious list), and useful (can often narrow down the error to the exact location within the suspicious expressions).
arXiv:2102.10152v1 fatcat:3wdloyliojaczdb6gftw5hhvgu

19th French-German-Swiss conference on Optimization September 2019, Nice

Didier Auroux, Jean-Baptiste Caillau, Régis Duvigneau, Abderrahmane Habbal, Christine Malot, Olivier Pantz, Luc Pronzato, Ludovic Rifford, Roland Ruelle, Chiara Soresi
2021 ESAIM Proceedings and Surveys  
19th French-German-Swiss conference on Optimization September 2019, Nice From September 17 to 20, 2019, the 19th edition of the bi-annual applied math conference that gathers the German and French communities  ... 
doi:10.1051/proc/202171100 fatcat:pknnwakrmvdyvec2r6jl6vuxxa

Towards Abstraction for DynAlloy Specifications [chapter]

Nazareno M. Aguirre, Marcelo F. Frias, Pablo Ponzio, Brian J. Cardiff, Juan P. Galeotti, Germán Regis
2008 Lecture Notes in Computer Science  
DynAlloy is an extension of the Alloy language to better describe state change via actions and programs, in the style of dynamic logic. In this paper, we report on our experience in trying to provide abstraction based mechanisms for improving DynAlloy specifications with respect to SAT based analysis. The technique we employ is based on predicate abstraction, but due to the context in which we make use of it, is subject to the following more specific improvements: (i) since DynAlloy's analysis
more » ... onsists of checking partial correctness assertions against programs, we are only interested in the initial and final states of a computation, and therefore we can safely abstract away some intermediate states in the computation (generally, this kind of abstraction cannot be safely applied in model checking), (ii) since DynAlloy's analysis is inherently bounded, we can safely rely on the sole use of a SAT solver for producing the abstractions, and (iii) since DynAlloy's basic operational unit is the atomic action, which can be used in different parts within a program, we can reuse the abstraction of an action in different parts of a program, which can accelerate the convergence in checking valid properties. We present the technique via a case study based on a translation of a JML annotated Java program into DynAlloy, accompanied by some preliminary experimental results showing some of the benefits of the technique.
doi:10.1007/978-3-540-88194-0_14 fatcat:pwm2qozikzfh7oz6owa5z5nadm

Training Binary Classifiers as Data Structure Invariants

Facundo Molina, Renzo Degiovanni, Pablo Ponzio, German Regis, Nazareno Aguirre, Marcelo Frias
2019 2019 IEEE/ACM 41st International Conference on Software Engineering (ICSE)  
We present a technique that enables us to distinguish valid from invalid data structure objects. The technique is based on building an artificial neural network, more precisely a binary classifier, and training it to identify valid and invalid instances of a data structure. The obtained classifier can then be used in place of the data structure's invariant, in order to attempt to identify (in)correct behaviors in programs manipulating the structure. In order to produce the valid objects to
more » ... the network, an assumed-correct set of object building routines is randomly executed. Invalid instances are produced by generating values for object fields that "break" the collected valid values, i.e., that assign values to object fields that have not been observed as feasible in the assumed-correct program executions that led to the collected valid instances. We experimentally assess this approach, over a benchmark of data structures. We show that this learning technique produces classifiers that achieve significantly better accuracy in classifying valid/invalid objects compared to a technique for dynamic invariant detection, and leads to improved bug finding.
doi:10.1109/icse.2019.00084 dblp:conf/icse/MolinaDPRAF19 fatcat:aznovd4qlbadla7vbbvdax7ske

Specifying Event-Based Systems with a Counting Fluent Temporal Logic

German Regis, Renzo Degiovanni, Nicolas D'Ippolito, Nazareno Aguirre
2015 2015 IEEE/ACM 37th IEEE International Conference on Software Engineering  
Fluent linear temporal logic is a formalism for specifying properties of event-based systems, based on propositions called fluents, defined in terms of activating and deactivating events. In this paper, we propose complementing the notion of fluent by the related concept of counting fluent. As opposed to the boolean nature of fluents, counting fluents are numerical values, that enumerate event occurrences, and allow us to specify naturally some properties of reactive systems. Although by
more » ... ng fluent linear temporal logic with counting fluents we obtain an undecidable, strictly more expressive formalism, we develop a sound (but incomplete) model checking approach for the logic, that reduces to traditional temporal logic model checking, and allows us to automatically analyse properties involving counting fluents, on finite event-based systems. Our experiments, based on relevant models taken from the literature, show that: (i) counting fluent temporal logic is better suited than traditional temporal logic for expressing properties in which the number of occurrences of certain events is relevant, and (ii) our model checking approach on counting fluent specifications is more efficient and scales better than model checking equivalent fluent temporal logic specifications.
doi:10.1109/icse.2015.86 dblp:conf/icse/RegisDDA15 fatcat:odjkjsdwengr5n3giicipb4byy

Perioperative results following lumbar discectomy: comparison of minimally invasive discectomy and standard microdiscectomy

John W. German, Mathew A. Adamo, Regis G. Hoppenot, Jessin H. Blossom, Henry A. Nagle
2008 Neurosurgical Focus  
doi:10.3171/foc/2008/25/8/e20 pmid:18673050 fatcat:6mue5noombgyzbgohtdqwtsthe

CLTSA: labelled transition system analyser with counting fluent support

Germán Regis, Renzo Degiovanni, Nicolas D'Ippolito, Nazareno Aguirre
2017 Proceedings of the 2017 11th Joint Meeting on Foundations of Software Engineering - ESEC/FSE 2017  
In this paper we present CLTSA (Counting Fluents Labelled Transition System Analyser), an extension of LTSA (Labelled Transition System Analyser) that incorporates counting fluents, a useful mechanism to capture properties related to counting events. Counting fluent temporal logic is a formalism for specifying properties of event-based systems, which complements the notion of fluent by the related concept of counting fluent. While fluents allow us to capture boolean properties of the behaviour
more » ... f a reactive system, counting fluents are numerical values, that enumerate event occurrences. The tool supports a superset of FSP (Finite State Processes), that allows one to define LTL properties involving counting fluents, which can be model checked on FSP processes. Detailed information can be found at CCS CONCEPTS • Theory of computation → Modal and temporal logics; Verification by model checking; • Software and its engineering → Specification languages;
doi:10.1145/3106237.3122828 dblp:conf/sigsoft/RegisDDA17 fatcat:o5apazp3bzbprotg6lbalxwut4

Automated workarounds from Java program specifications based on SAT solving

Marcelo Uva, Pablo Ponzio, Germán Regis, Nazareno Aguirre, Marcelo F. Frias
2018 International Journal on Software Tools for Technology Transfer (STTT)  
The failures that bugs in software lead to can sometimes be bypassed by the so called workarounds: when a (faulty) routine fails, alternative routines that the system offers can be used in place of the failing one, to circumvent the failure. Previous works have exploited this workarounds notion to automatically recover from runtime failures in some application domains. However, existing approaches that compute workarounds automatically either require the user to manually build an abstract model
more » ... of the software under consideration, or to provide equivalent sequences of operations from which workarounds are computed, diminishing the automation of workaround-based system recovery. In this paper, we present two techniques that automatically compute workarounds from Java code equipped with formal specifications, avoiding abstract software models and user provided equivalences. These techniques employ SAT solving to compute workarounds on concrete program state characterizations. The first employs SAT solving to compute traditional workarounds, while the second directly exploits SAT solving to circumvent a failing method, building a state that mimics the (correct) behaviour of this failing routine. Our experiments, based on case studies involving implementations of collections and a library for date arithmetic, enable us to show that the techniques can effectively compute workarounds from complex contracts in an important number of cases, in time that makes them feasible to be used for run time repairs.
doi:10.1007/s10009-018-0503-8 fatcat:b6dkkffohvay3i4xlanwlkzif4

Cold ablation driven by localized forces in alkali halides

Masaki Hada, Dongfang Zhang, Kostyantyn Pichugin, Julian Hirscht, Michał A. Kochman, Stuart A. Hayes, Stephanie Manz, Regis Y.N. Gengler, Derek A. Wann, Toshio Seki, Gustavo Moriena, Carole A. Morrison (+3 others)
2014 Nature Communications  
Laser ablation has been widely used for a variety of applications. Since the mechanisms for ablation are strongly dependent on the photoexcitation level, so called cold material processing has relied on the use of high-peak-power laser fluences for which nonthermal processes become dominant; often reaching the universal threshold for plasma formation of B1 J cm À 2 in most solids. Here we show single-shot time-resolved femtosecond electron diffraction, femtosecond optical reflectivity and ion
more » ... tection experiments to study the evolution of the ablation process that follows femtosecond 400 nm laser excitation in crystalline sodium chloride, caesium iodide and potassium iodide. The phenomenon in this class of materials occurs well below the threshold for plasma formation and even below the melting point. The results reveal fast electronic and localized structural changes that lead to the ejection of particulates and the formation of micron-deep craters, reflecting the very nature of the strong repulsive forces at play.
doi:10.1038/ncomms4863 pmid:24835317 fatcat:dqnbagky6fczrgp5nzy77snbj4

Fluent Logic Workflow Analyser: A Tool for The Verification of Workflow Properties

Germán Regis, Fernando Villar, Nicolás Ricci
2014 Electronic Proceedings in Theoretical Computer Science  
In this paper we present the design and implementation, as well as a use case, of a tool for workflow analysis. The tool provides an assistant for the specification of properties of a workflow model. The specification language for property description is Fluent Linear Time Temporal Logic. Fluents provide an adequate flexibility for capturing properties of workflows. Both the model and the properties are encoded, in an automated way, as Labelled Transition Systems, and the analysis is reduced to model checking.
doi:10.4204/eptcs.139.4 fatcat:mpf5dzrffvg5pe3vjxdlqzyhhe

Stump regrowth and estimation of reconstituting Caatinga shrub-tree biomass under forest management

Tamires Leal de Lima, Rinaldo Luiz Caraciolo Ferreira, José Antônio Aleixo da Silva, Francisco Tarcísio Alves Júnior, André Luiz Alves de Lima, German Hugo Gutierrez Céspedes, Rute Berger, Régis Villanova Longhi
2018 Scientia Forestalis/Forest Sciences  
Resumo Objetivou-se avaliar a rebrota e reconstituir a biomassa arbustiva-arbórea a partir das cepas em uma área de Caatinga sob manejo florestal em Floresta-PE, Brasil. Dois anos após intervenção em 18 parcelas foram medidas as circunferências e alturas das cepas e dos perfilhos. Foi avaliada a influência do diâmetro e da altura da cepa na brotação das espécies. Em uma área próxima e sem intervenção, foram tomados dados de diâmetro a altura da base e do peito para reconstituição da biomassa
more » ... lorada. Verificou-se que Poincianella bracteosa e Aspidosperma pyrifolium emitiram maior número de perfilhos nas cepas com circunferência maior que 30 cm, mas sem influência da altura da cepa. A biomassa média estimada (17186,16 kg ha -1 ) foi similar a áreas submetidas à intervenção antrópica e a sua reconstituição pode ser uma ferramenta auxiliar na para órgãos ambientais na fiscalização de desmatamento ilegal. Palavras-chave: corte raso, regeneração natural, semiárido Abstract This study aimed to evaluate stump regrowth and estimate the reconstitution of shrub-tree biomass from the stumps in an area of Caatinga under forest management in Floresta-PE, Brazil. The circumferences and heights of the stump and sprouts were measured two years after an intervention on 18 plots. The influence of the stump diameter and its height on the sprouting ability of the species was evaluated. Data was taken in the next area without intervention in order to estimate the diameter at breast height for reconstitution of the exploited biomass. We found that the tillering for Poincianella bracteosa and Aspidosperma pyrifolium was influenced by the size of the circumference, but not by the stump height. The average estimated biomass (17186.16 kg ha -1 ) was similar to other areas also subject to human intervention, and its reconstitution can be an auxiliary tool for monitoring illegal deforestation by environmental agencies.
doi:10.18671/scifor.v46n119.12 fatcat:qo2qvx7tejbd7az63lmassbq7q

DynAlloy analyzer: a tool for the specification and analysis of alloy models with dynamic behaviour

Germán Regis, César Cornejo, Simón Gutiérrez Brida, Mariano Politano, Fernando Raverta, Pablo Ponzio, Nazareno Aguirre, Juan Pablo Galeotti, Marcelo Frias
2017 Proceedings of the 2017 11th Joint Meeting on Foundations of Software Engineering - ESEC/FSE 2017  
We describe DynAlloy Analyzer, a tool that extends Alloy Analyzer with support for dynamic elements in Alloy models. The tool builds upon Alloy Analyzer in a way that makes it fully compatible with Alloy models, and extends their syntax with a particular idiom, inspired in dynamic logic, for the description of dynamic behaviours, understood as sequences of states over standard Alloy models, in terms of programs. The syntax is broad enough to accommodate abstract dynamic behaviours, e.g., using
more » ... ondeterministic choice and finite unbounded iteration, as well as more concrete ones, using standard sequential programming constructions. The analysis of DynAlloy models resorts to the analysis of Alloy models, through an optimized translation that often makes the analysis more efficient than that of typical ad-hoc constructions to capture dynamism in Alloy. Tool screencast, binaries and further details available in:
doi:10.1145/3106237.3122826 dblp:conf/sigsoft/RegisCBPRPAGF17 fatcat:aa4exsdgpfh2fnv7z3kvddqg2q

Page 411 of MLN Vol. 35, Issue 7 [page]

1920 MLN  
(ib.). item pro $ libra serici nigri ad complendos francos iaccarum dnorum Regis et Witoldi III marc. (p. 219).  ...  The earliest recorded instance of the German word seems to be in a Latin glossary of the year 1417.  ... 
« Previous Showing results 1 — 15 out of 33,773 results