1,720,958 research outputs found
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
Manipulation résiliente aux erreurs de l'information quantique avec des codes stabilisateurs LDPC
No full textQuantum stabilizer codes, and in particular quantum LDPC codes, are among the main contenders towards quantum error correction, thought to be required for quantum computers to be usable at least in the foreseeable future. Finding stabilizer codes with interesting encoding rates is not quite enough, one must be able to act upon them and decode them efficiently at the same time. In this thesis, we try to solve the technical problems posed by the decoding of stabilizer codes undergoing logical operations and overlooked in the literature by introducing a heuristic to an existing decoder algorithm. This is a matter of utmost importance as error-corrected quantum hardware is starting to emerge. Armed with this decoder, we simulate a full fault-tolerant Clifford logical gate set for the toric code, paving the way for more logical operations of stabilizer codes encoding multiple qubits to be investigated. To this end, we introduce Bell-state simulations that could help to study the correlation between logical errors in these blocks of code. We finally extend our results to find new logical gates for the toric color codes by exploiting the inherent link between them and the toric code, and we define a new family of triangular color codes that we think could offer some advantages compared to concatenated color codes.Les codes stabilisateurs, et en particulier les codes quantiques LDPC, sont les principaux candidats qui permettraient la correction d'erreurs quantiques, nécessaire à moyen terme pour rendre l'ordinateur quantique utilisable. Trouver des codes stabilisateurs ayant de bons taux d'encodage n'est cependant pas suffisant puisqu'il est nécessaire d'être capable de leur appliquer un ensemble de portes quantiques universel ainsi que de pouvoir les décoder efficacement. Dans cette thèse, nous tentons de résoudre les difficultés soulevées par la conciliation de ces deux nécessités omise par l'état de l'art, via la formulation d'une nouvelle heuristique pour l'algorithme de décodage existant. Les dernières avancées matérielles pour la conception d'ordinateurs quantiques rendent cette question d'autant plus fondamentale. Armés de ce décodeur, nous simulons un ensemble de portes logiques de Clifford tolérantes aux fautes pour le code torique. Un protocole de simulation exploitant des états de Bell a dû être créé pour y parvenir. Nous espérons ainsi ouvrir la voie vers de nouvelles implémentations de portes logiques pour les codes stabilisateurs encodant plusieurs qubits logiques. Enfin, nous étendons nos résultats jusqu'à trouver de nouvelles implémentations de portes logiques pour le code couleur torique, en exploitant le lien intime le reliant aux codes de surface toriques. Nous définissons également une nouvelle classe de codes couleurs dont nous pensons qu'ils pourraient apporter certains avantages par rapport aux codes couleurs concaténés
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
Manipulation résiliente aux erreurs de l'information quantique avec des codes stabilisateurs LDPC
No full textQuantum stabilizer codes, and in particular quantum LDPC codes, are among the main contenders towards quantum error correction, thought to be required for quantum computers to be usable at least in the foreseeable future. Finding stabilizer codes with interesting encoding rates is not quite enough, one must be able to act upon them and decode them efficiently at the same time. In this thesis, we try to solve the technical problems posed by the decoding of stabilizer codes undergoing logical operations and overlooked in the literature by introducing a heuristic to an existing decoder algorithm. This is a matter of utmost importance as error-corrected quantum hardware is starting to emerge. Armed with this decoder, we simulate a full fault-tolerant Clifford logical gate set for the toric code, paving the way for more logical operations of stabilizer codes encoding multiple qubits to be investigated. To this end, we introduce Bell-state simulations that could help to study the correlation between logical errors in these blocks of code. We finally extend our results to find new logical gates for the toric color codes by exploiting the inherent link between them and the toric code, and we define a new family of triangular color codes that we think could offer some advantages compared to concatenated color codes.Les codes stabilisateurs, et en particulier les codes quantiques LDPC, sont les principaux candidats qui permettraient la correction d'erreurs quantiques, nécessaire à moyen terme pour rendre l'ordinateur quantique utilisable. Trouver des codes stabilisateurs ayant de bons taux d'encodage n'est cependant pas suffisant puisqu'il est nécessaire d'être capable de leur appliquer un ensemble de portes quantiques universel ainsi que de pouvoir les décoder efficacement. Dans cette thèse, nous tentons de résoudre les difficultés soulevées par la conciliation de ces deux nécessités omise par l'état de l'art, via la formulation d'une nouvelle heuristique pour l'algorithme de décodage existant. Les dernières avancées matérielles pour la conception d'ordinateurs quantiques rendent cette question d'autant plus fondamentale. Armés de ce décodeur, nous simulons un ensemble de portes logiques de Clifford tolérantes aux fautes pour le code torique. Un protocole de simulation exploitant des états de Bell a dû être créé pour y parvenir. Nous espérons ainsi ouvrir la voie vers de nouvelles implémentations de portes logiques pour les codes stabilisateurs encodant plusieurs qubits logiques. Enfin, nous étendons nos résultats jusqu'à trouver de nouvelles implémentations de portes logiques pour le code couleur torique, en exploitant le lien intime le reliant aux codes de surface toriques. Nous définissons également une nouvelle classe de codes couleurs dont nous pensons qu'ils pourraient apporter certains avantages par rapport aux codes couleurs concaténés
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
Manipulation résiliente aux erreurs de l'information quantique avec des codes stabilisateurs LDPC
No full textQuantum stabilizer codes, and in particular quantum LDPC codes, are among the main contenders towards quantum error correction, thought to be required for quantum computers to be usable at least in the foreseeable future. Finding stabilizer codes with interesting encoding rates is not quite enough, one must be able to act upon them and decode them efficiently at the same time. In this thesis, we try to solve the technical problems posed by the decoding of stabilizer codes undergoing logical operations and overlooked in the literature by introducing a heuristic to an existing decoder algorithm. This is a matter of utmost importance as error-corrected quantum hardware is starting to emerge. Armed with this decoder, we simulate a full fault-tolerant Clifford logical gate set for the toric code, paving the way for more logical operations of stabilizer codes encoding multiple qubits to be investigated. To this end, we introduce Bell-state simulations that could help to study the correlation between logical errors in these blocks of code. We finally extend our results to find new logical gates for the toric color codes by exploiting the inherent link between them and the toric code, and we define a new family of triangular color codes that we think could offer some advantages compared to concatenated color codes.Les codes stabilisateurs, et en particulier les codes quantiques LDPC, sont les principaux candidats qui permettraient la correction d'erreurs quantiques, nécessaire à moyen terme pour rendre l'ordinateur quantique utilisable. Trouver des codes stabilisateurs ayant de bons taux d'encodage n'est cependant pas suffisant puisqu'il est nécessaire d'être capable de leur appliquer un ensemble de portes quantiques universel ainsi que de pouvoir les décoder efficacement. Dans cette thèse, nous tentons de résoudre les difficultés soulevées par la conciliation de ces deux nécessités omise par l'état de l'art, via la formulation d'une nouvelle heuristique pour l'algorithme de décodage existant. Les dernières avancées matérielles pour la conception d'ordinateurs quantiques rendent cette question d'autant plus fondamentale. Armés de ce décodeur, nous simulons un ensemble de portes logiques de Clifford tolérantes aux fautes pour le code torique. Un protocole de simulation exploitant des états de Bell a dû être créé pour y parvenir. Nous espérons ainsi ouvrir la voie vers de nouvelles implémentations de portes logiques pour les codes stabilisateurs encodant plusieurs qubits logiques. Enfin, nous étendons nos résultats jusqu'à trouver de nouvelles implémentations de portes logiques pour le code couleur torique, en exploitant le lien intime le reliant aux codes de surface toriques. Nous définissons également une nouvelle classe de codes couleurs dont nous pensons qu'ils pourraient apporter certains avantages par rapport aux codes couleurs concaténés
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
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