1,721,132 research outputs found
High-Level Net Processes
No full textFormal and Natural Computing, W. Brauer, H. Ehrig, J. Karhumaki, A. Salomaa eds., Springe
Composition and Decomposition of DPO Transformations with Borrowed Context
No full textICGT'06, A. Corradini, H. Ehrig, U. Montanari, L. Ribeiro and G. Rozenberg eds., Springer
Relating SPO and DPO graph rewriting with Petri nets having read, inhibitor and reset arcs
No full textPNGT'04. H. Ehrig, J. Padberg, G. Rozenberg eds., Elsevier
Application of Graph Transformation Techniques to the Area of Petri Nets: An Overview (Extended Abstract)
No full textB. Braatz, H. Ehrig, K. Homann, J. Padberg, M. Urbasek Technical University Berlin, Germany Institute for Software Technology and Theoretical Computer Science fbbraatz, ehrig, hoffmann, padberg, [email protected] 1 Aims an
Compositional Modeling of Reactive Systems Using Open Nets
No full textIn order to model the behaviour of open concurrent systems by means of Petri nets, we introduce open Petri nets, a generalization of the ordinary model where some places, designated as open, represent an interface of the system towards the environment. Besides generalizing the token game to reflect this extension, we define a truly concurrent semantics for open nets by extending the Goltz-Reisig process semantics of Petri nets. We introduce a composition operation over open nets, characterized as a pushout in the corresponding category, suitable to model both interaction through open places and synchronization of transitions. The process semantics is shown to be compositional with respect to such composition operation. Technically, our result is similar to the amalgamation theorem for data-types in the framework of algebraic specifications. A possible application field of the proposed constructions and results is the modeling of interorganizational workflows, recently studied in the literature. This is illustrated by a running example
Graph Transformations: Proceedings of the 2nd International Conference ICGT 2004
No full textAtti del convegno ICGT 2004
Springer-Verla
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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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