1,720,957 research outputs found
Timeout Order Abstraction for Time-Parametric Verification of Loosely Synchronized Real-Time Distributed Systems
No full textURL to paper listed on conference site.We present timeout order abstraction (TO-abstraction), a
technique to systematically abstract a given loosely synchronized
real-time distributed system (LSRTDS) into an untimed model. We
define the subclass of LSRTDS’s that we can apply TO-abstraction
using a syntax template that represents a restriction to Tempo,
the primary modeling language of TIOA [7]. The untimed model
obtained from the abstraction is a classical finite state machine, and
thus one can automatically verify temporal properties of the model
using a conventional model-checker. We prove the soundness of the
abstraction using simulation relation. From this result, we guarantee
that any untimed safety property of the untimed model also holds for
the original TIOA model.
We have applied TO-abstraction to a resource-sharing protocol
and the DHCP Failover protocol. We verified untimed abstractions
of them by bounded model-checking up to depth 20. We have also
experimented with effectiveness of bug-finding using our technique by
mutating particular parts of the original code. From this experiment,
we found a complex bad execution that would have been very difficult
to find by human or simulations.National Science Foundation (U.S.) (NSF Award CCF-0702670)National Science Foundation (U.S.) (NSF Award CNS-0614414)United States. Dept. of the Air Force (AFOSR/DOD CAP Funds
Automated Formal Verification of the DHCP Failover Protocol Using Timeout Order Abstraction
Full text linkIn this paper, we present automated formal verification of the DHCP Failover protocol. We conduct bounded model-checking for the protocol using Timeout Order Abstraction (TO-Abstraction), a technique to abstract a given timed model in a certain sub-class of loosely synchronized real-time distributed systems into an untimed model. A resulting untimed model from TO-abstraction is a finite state machine, and therefore one can verify the model using a conventional model-checker. We have verified the protocol by bounded model-checking up to depth 20. We also experimented with "mutating" the original code to examine the efficiency of bug-finding using TO-Abstraction. We used two mutated pieces of the original code. The first one represents a model that uses a stronger failure assumption. The second one represents a model that the protocol implementer has forgot to add a certain check of a received message. We found one counterexample for each of two pieces of mutated code. In particular, the counterexample that was found for the second mutated code had a complex scenario, and we believe that it is considerably difficult to find the counterexample by human or simulations.National Science Foundation (U.S.). (Award 0702670
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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