1,721,022 research outputs found
Replication Data for: Orient Express: Using Frobenius to Express Oriented Isogenies
No full textWe describe a new cryptographic group action built from isogenies, using the Frobenius endomorphism as an accelerator. This dataset consists of SageMath code providing a proof-of-concept implementation of two instantiations of this group action: the "square case" and the "square-free case". The main goal of the code is to help convince the reader that the algorithm really works in practice, and to allow for comparison with similar algorithms. E.g., using this implementation, we have produced the runtimes reported in Table 4 and Table 5
Breaking the Decisional Diffie-Hellman Problem for Class Group Actions Using Genus Theory: Extended Version
Full text linksponsorship: * This work was supported in part by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement ISOCRYPT-No. 101020788) and by the Research Council KU Leuven grants C14/18/067, and by CyberSecurity Research Flanders with reference number VR20192203. JS was supported by the Dutch Research Council (NWO) through Gravitation-grant Quantum Software Consortium-024.003.037. (European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement ISOCRYPT)|101020788, Research Council KU Leuven|C14/18/067, CyberSecurity Research Flanders|VR20192203, Dutch Research Council (NWO) through Gravitation-grant Quantum Software Consortium|024.003.037, European Research Council (ERC)|101020788)status: Publishe
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
Scrollar invariants, syzygies and representations of the symmetric group
Full text linksponsorship: The first-listed author is supported by the European Research Council (ERC) with grant no. 101020788 Adv-ERCISOCRYPT, by Cyber Security Research Flanders with reference VR20192203, and by Research Council KU Leuven with grant no. C14/18/067. The second-listed author is supported by the Research Foundation - Flanders(FWO) with grant no. 11F1921N. The third-listed author is supported by the National Natural Science Foundation of China with grant no. 12071371. (European Research Council (ERC)|101020788 Adv-ERCISOCRYPT, CyberSecurity Research Flanders|VR20192203, Research Council KU Leuven|C14/18/067, Research Foundation - Flanders (FWO)|11F1921N, National Natural Science Foundation of China|12071371)status: Publishe
Two Remarks on the Vectorization Problem
No full textsponsorship: The author names are in alphabetical order: see https://www.ams.org//profession/leaders/CultureStatement04.pdf.The paper was written in the context of the second-listed author's participation in the Honours @ KU Leuven Programme and was supported in part by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement ISOCRYPT -No. 101020788), by CyberSecurity Research Flanders with reference number VR20192203, and by the Research Council KU Leuven under grant number C14/18/067. Both authors would like to thank the anonymous reviewers for helpful comments. (European Research Council (ERC) under the European Union|101020788, CyberSecurity Research Flanders|VR20192203, Research Council KU Leuven|C14/18/067, European Research Council (ERC)|101020788)status: Publishe
Punten tellen op niet-gedegenereerde krommen.
Full text linkIn deze thesis presenteren we een algoritme dat de Hasse-Weil-zetafunctie berekent van wat we 'niet-gedegenereerde krommen' noemen. Dit zijn krommen die gedefinieerd zijn door een bivariate Laurentveelterm die niet-gedegenereerd is ten opzichte van zijn Newtonpolytoop. Dit is een Zariski-open conditie, waardoor ons algoritme voor bijna elke vlakke kromme werkt. De methode is gebaseerd op Kedlaya's algoritme voor het tellen van punten op hyperelliptische krommen over eindige velden, gebruik makend van Monsky-Washnitzercohomologie. Ruwweg gesteld zijn er drie taken te vervullen bij het berekenen van de zetafunctie à la Kedlaya. Ten eerste moet er een basis gevonden worden voor de eerste cohomologieruimte. Ten tweede moet de actie van het Frobeniusendomorfisme op deze basis berekend worden. Tenslotte moet het resultaat opnieuw in termen van de basis worden uitgedrukt. Op die manier bekomen een matrix van Frobenius, en via de spoorformule van Lefschetz kan de zetafunctie hier gemakkelijk uit bepaald worden. Een cruciale eigenschap van niet-gedegenereerde krommen is dat hun meetkundige eigenschappen vaak afgelezen kunnen worden uit de combinatorische eigenschappen van de Newtonpolytoop. Daarnaast blijft het niet-gedegenereerd zijn bewaard onder het nemen van een p-adische lift met dezelfde Newonpolytoop. Dat zorgt voor een diep meetkundig verband tussen deze lift en de originele kromme, wat kan worden uitgebuit om effeciënt te rekenen in de eerste cohomologieruimte. Dit 'lost' de eerste en de derde taak op. De tweede taak kan elegant worden opgelost door gebruik te maken van een nieuwe effectieve Nullstellensatz, die ook op zichzelf interessant is. De tijdscomplexiteit van ons algoritme bedraagt O(n {3+epsilon} Psi_t) en de hoeveelheid geheugen die nodig is, is O(n {3 + epsilon} Psi_s). Hierbij is n de uitbreidingsgraad van het eindig veld waarover we werken, en zijn Psi_s en Psi_t functies die enkel van de Newtonpolytoop van de ingevoerde kromme afhangen. Voor niet al te exotische krommen zal Psi_t = g 6.5 en Psi_s = g 4, waarbij g het aantal inwendige roosterpunten van de Newtonpolytoop is (dit is ook gelijk aan het geslacht van de kromme). De hoofdresultaten van deze thesis werden bekomen in samenwerking met Jan Denef en Frederik Vercauteren.status: Publishe
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
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