1,720,956 research outputs found
Tuple calculus for multiset table algebra
Full text linkThis paper is a logical continuation of research devoted to the actual problem of developing the theoretical foundations of table (relational) databases. The issue of using multisets in table databases is important and relevant. Many database-oriented languages require a relational model with multiset semantics. There are many applied problems, the feature of which is multiplicity and repeatability of data. For example, these are sociological polls of different population groups, calculations on DNA, and others. In this context, the question of constructing a tuple calculus for a multiset table algebra is considered, in which the concept of a table is refined using the concept of a multiset. In the article, the formalization of tuple calculus for multiset table algebra is carried out. The alphabet, and the syntax of terms, atoms, and formulas are defined. A set of legal formulas is introduced through the concept of the free and bound variable. The concept of a scheme and set of attributes with which a tuple variable occurs in a formula are also introduced. The definition of tuple calculus expression for multiset table algebra is given, according to which it is a multiset of tuples that satisfy the condition defined by the legal formula. The article provides rules for determining the number of tuple duplicates in the resulting multiset. Another important result consists in proving that constructed tuple calculus is as expressive as multiset table algebra. This research opens up new possibilities for database theory development and may be useful for information technology and database professionals. It contributes to a deeper understanding of construction query principles, an important aspect of modern computer science and industry.Prombles in programming 2024; 2-3: 28-3
Числення рядків для мультимножинної табличної алгебри
Full text linkThis paper is a logical continuation of research devoted to the actual problem of developing the theoretical foundations of table (relational) databases. The issue of using multisets in table databases is important and relevant. Many database-oriented languages require a relational model with multiset semantics. There are many applied problems, the feature of which is multiplicity and repeatability of data. For example, these are sociological polls of different population groups, calculations on DNA, and others. In this context, the question of constructing a tuple calculus for a multiset table algebra is considered, in which the concept of a table is refined using the concept of a multiset. In the article, the formalization of tuple calculus for multiset table algebra is carried out. The alphabet, and the syntax of terms, atoms, and formulas are defined. A set of legal formulas is introduced through the concept of the free and bound variable. The concept of a scheme and set of attributes with which a tuple variable occurs in a formula are also introduced. The definition of tuple calculus expression for multiset table algebra is given, according to which it is a multiset of tuples that satisfy the condition defined by the legal formula. The article provides rules for determining the number of tuple duplicates in the resulting multiset. Another important result consists in proving that constructed tuple calculus is as expressive as multiset table algebra. This research opens up new possibilities for database theory development and may be useful for information technology and database professionals. It contributes to a deeper understanding of construction query principles, an important aspect of modern computer science and industry.Prombles in programming 2024; 2-3: 28-36Дана робота становить логічне продовження досліджень, присвячених актуальній проблемі розробки теоретичних основ реляційних (табличних) баз даних. Питання використання мультимножин у табличних базах даних є важливим і актуальним, зважаючи на те, що багато мов запитів, орієнтованих на роботу з базами даних, потребують реляційну модель, яка передбачає мультимножинну семантику. Це обумовлено наявністю прикладних задач, особливістю яких є множинність і повторюваність даних. Наприклад, це соціологічні опитування різних груп населення, розрахунки на ДНК та ін. У цьому контексті розглядається питання побудови числення рядків для мультимножинної табличної алгебри, в якій поняття таблиці уточнюється, використовуючи поняття мультимножини. У роботі проведено формалізацію числення рядків для мультимножинної табличної алгебри: визначено алфавіт, синтаксис термів, атомів і формул числення рядків; введено множину дозволених формул, використовуючи концепцію вільних і зв'язаних рядків; також вводяться поняття схеми та множини атрибутів, з якими рядок зустрічається у формулах. Дано означення виразу числення рядків для мультимножинної табличної алгебри, згідно з яким – це мультимножина рядків, що задовольняють визначену дозволеною формулою умову. У статті наведено правила, за якими визначається кількість дублікатів рядків у результуючій мультимножині. Інший важливий результат полягає у доведенні того, що побудоване числення рядків є не менш виразним, ніж мультимножинна таблична алгебра. Це дослідження відкриває нові можливості для розвитку теорії баз даних і може бути корисним для спеціалістів у сфері інформаційних технологій та баз даних. Воно сприяє глибшому розумінню принципів побудови запитів, що є важливим аспектом у сучасній комп'ютерній науці та індустрії.Prombles in programming 2024; 2-3: 28-3
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
Analysis of storage and display frameworks based on aspect-oriented technologies
No full textA set of recommendations for the use of dependency injection and aspect-oriented programming in software development is proposed. The influence of their use on the process of design, development, testing, further support and architecture of a software product is analysed.Prombles in programming 2013; 2: 41-5
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