1,721,534 research outputs found
Poggi (A.). — L'évolution de la neige déposée à moyenne altitude.
No full textLoup Jean. Poggi (A.). — L'évolution de la neige déposée à moyenne altitude.. In: Revue de géographie alpine, tome 55, n°4, 1967. pp. 724-725
Poggi (A.). — Introduction à la micrométéorologie ; Transferts d'énergie atmosphère-sol.
No full textLoup Jean. Poggi (A.). — Introduction à la micrométéorologie ; Transferts d'énergie atmosphère-sol. . In: Revue de géographie alpine, tome 66, n°4, 1978. pp. 479-480
A preliminary experimentation for large scale epidemic forecasting simulations
No full textAgent-based modeling and simulation are some powerful techniques that are widely used with success for analyzing complex and emergent phenomena in many research and application areas. Many different reasons are behind the success of such techniques, among which an important mention goes to the availability of a great variety of software tools, that ease the development of models, as well as the execution of simulations and the analysis of results. This paper presents an actor software library, called ActoDeS, for the development of concurrent and distributed systems, and shows how it can be a suitable mean for building flexible and scalable epidemic forecasting simulations. In particular, the paper presents the first results of the experimentation of ActoDeS for defining a COVID-19 epidemic diffusion model and for supporting the simulation in large populations
ActorNode2Vec: An Actor-based solution for Node Embedding over large networks
No full textThe application of Machine Learning techniques over networks, such as prediction tasks over nodes and edges, is becoming often crucial in the analysis of Complex systems in a wide range of research fields. One of the enabling technologies in that sense is represented by Node Embedding, which enables us to learn features automatically over the network. Among the different approaches proposed in the literature, the most promising are DeepWalk and Node2Vec, where the embedding is computed by combining random walks and neural language models. However, characteristic limitations with these techniques are related to memory requirements and time complexity. In this paper, we propose a distributed and scalable solution, named ActorNode2vec, that keeps the best advantages of Node2Vec and overcomes the limitations with the adoption of the actor model to distribute the computational load. We demonstrate the efficacy of this approach with a large network by analyzing the sensitivity of walk length and number of walks parameters and make a comparison also with Deep walk and an Apache Spark distributed implementation of Node2Vec. Results show that with ActorNode2vec computational times are drastically reduced without losing embedding quality and overcoming memory issues
Ontology-based data access with MASTRO
No full textIn several areas, such as Enterprise Application Integration, Data Integration,
and the Semantic Web, clients need to access the services exported by the system,
and hence require a representation of the intensional level of the application domain in
terms of which they can specify the access to the exported services. One of the most
interesting usages of such a shared conceptualization is ontology-based data access,
where a conceptual layer is exported to the client, abstracting away from how actual
data is maintained. Therefore, an ontology-based data access system has to adress the
“impedance mismatch” issue, existing between data actually present at the sources, and
objects represented at the intensional level.
In this demo, we present MASTRO, an ontology-based data access system that extends the QuOnto system [1] with new capabilities and uses the QuOnto engine at its
core. Specifically, MASTRO provides tractable reasoning over an ontology, laying over
an autonomous relational DBMS managing the data layer. In what follows, we introduce
the main services provided by MASTRO, namely (i) ontology specification, (ii) query
answering, (iii) ontology satisfiability, and (iv) meta-query answering. The present work
is one of the outcomes of the European project TONES
A Distributed Object-Oriented Language for Heterogeneous Computer Networks
No full textThis paper presents an object-oriented distributed language, called CUBL++, that is a powerful tool for developing distributed applications on heterogeneous computer networks. CUBL++ is based on objects, called c_units, that communicate through synchronous and asynchronous message passing. A c_unit is an active object composed of data (state) and procedures as traditional (passive) objects, together with the capability of queueing incoming messages, when needed. C_units allow a programmer to implement an application on a heterogeneous architecture, as they communicate with each other without taking into account the physical characteristics of the actual node where they are located. We have experimented CUBL++ on a network where UNIX workstations, WindowsNT personal computers and transputers cooperate in order to perform a given task. In particular, this paper gives a brief description of a distributed system for image processing that has been implemented by using CUBL++
Le Regioni tra riforma amministrativa e revisione costituzionale
No full textevoluzione della forma di Stato regionale in Itali
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
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
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