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Wyświetlanie 1-5 z 5
Tytuł:
An efficient SQL-based querying method to RDF schemata
Autorzy:
Falkowski, M.
Jędrzejek, Cz.
Powiązania:
https://bibliotekanauki.pl/articles/970821.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
semantic data
graph query
RDF
relational database
query rewriting
Opis:
Applications based on knowledge engineering require operations on semantic data. Modern systems have to deal with large data volumes and the challenge is to process and search these data effectively. One of the aspects of efficiency is the ability to query those data with respect to their semantics. In this area an RDF data model and a SPARQL query language gained the highest popularity and are de facto standards. The problem is that most data in modern systems are stored in relational databases and have no formal and precisely expressed semantics, although operations on those data are fast and scalable. Traditionally, in this area relational data are transformed to a form expected by reasoning and querying systems (usually RDF based). In this work a method of query rewriting is presented that translates a query to an RDF data structure (i.e. SPARQL query) to a SQL query executed by RDBMS. Transforming queries instead of data has many advantages and might lead to significant increase of data extraction efficiency.
Źródło:
Control and Cybernetics; 2009, 38, 1; 193-213
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel approach to hierarchical contextual bipolar queries : a winnow operator approach
Autorzy:
Kacprzyk, Janusz
Zadrożny, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/2183491.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
database query
bipolar query
context
fuzzy logic
user intention
user preferences
Opis:
We propose a new approach to the bipolar database queries, which involve a necessary (required) and optional (desired) conditions, connected with a non-conventional aggregation operator “and possibly”, combined with a context, exemplified by “find houses which are cheap and – with respect to other houses in town – possibly close to a railroad station”. We use our winnow operator based interpretation of the bipolar queries. We assume that the query, posed by the human user, involves terms, which do not directly relate to attributes, and which are then to be decoded using a concept of a query hierarchy, leading to the queries, which involve terms directly related to attribute values. The original query is considered to be of level 0, at the bottom of the precisiation hierarchy, then its required and optional parts are assumed to be bipolar queries themselves, both accounting for context. The precisiation proceeds further, to level 1 queries, level 2, etc. A real estate related example is provided as illustration.
Źródło:
Control and Cybernetics; 2022, 51, 2; 267--283
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Schema mapping and query reformulation in peer-to-peer XML data integration system
Autorzy:
Pankowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/970787.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
semantic data integration
XML schema mapping
XML functional dependencies
query reformulation
query answering in peer-to-peer systems
Opis:
In the paper we discuss the problem of XML data integration in a P2P environment. In this setting each peer stores schema of its local data, mappings between the schema and schemas of some other peers (peer's partners), and schema constraints. The goal of the integration is to answer the queries formulated against arbitrarily chosen peers. The answer consists of data stored in the queried peer as well as data of its direct and indirect partners. We focus on denning and using mappings, schema constraints, and query reformulation in such scenario. We discuss a strategy that allows us to obtain a complete answer with the possibility of discovering missing values. The method is the theoretical foundation of the implementation of SixP2P system (Semantic Integration of XML data in P2P environment).
Źródło:
Control and Cybernetics; 2009, 38, 1; 173-192
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Yet another object-oriented data model and its application
Jeszcze jeden obiektowo zorientowany model danych i jego zastosowanie
Autorzy:
Jankowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/206751.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
model danych
język zapytań
rachunek obiektowy
data model
calculus for objects
query language
Opis:
In this paper we propose a certain object-oriented data model. It originates from the calculus for complex objects of Bancilhon and Khoshafian. These two models differ mainly in terms of the set objects' interpretation. In our model a set object stands for a set of items denoting different forms of the same object. As a consequence, a new sub object relation must be defined. Then, new functions of union, intersection and complement are defined. It is proven that the new data model is not only a lattice, but also a Boolean algebra. Finally, the model is expanded into a new calculus for objects. It is shown that the calculus provides a firm background for some interesting query language.
W artykule zaproponowano pewien obiektowo zorientowany model danych. Wywodzi się on z rachunku dla obiektów złożonych, wprowadzonego przez Bancilhona i Koshafiana. Te dwa modele różnią się między sobą w zakresie interpretacji obiektów typu zbioru. W zaproponowanym modelu obiekt typu zbioru oznacza zbiór pewnych przedmiotów oznaczających różne formy tego samego obiektu. W konsekwencji, trzeba zdefiniować nową relację, sub object. Wówczas definiuje się nowe funkcje: union (suma), intersection (przecięcie) oraz complement (dopełnienie). Wykazuje się, że nowy model nie tylko jest kratą, ale i algebrą Boole'owską. W końcu, zaproponowany model jest rozszerzony do postaci nowego rachunku dla obiektów. Pokazano, że ten rachunek stanowi dobrą podstawę do pewnego interesującego języka zapytań.
Źródło:
Control and Cybernetics; 2003, 32, 1; 175-195
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systematic analysis and review of video object retrieval techniques
Autorzy:
Ghuge, C. A.
Prakash, V. Chandra
Ruikar, Sachin D.
Powiązania:
https://bibliotekanauki.pl/articles/2050246.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
video object retrieval
computer vision
deep learning
fuzzy-based techniques
machine learning
query-based techniques
graph-based techniques
Opis:
Video object retrieval is a promising research direction, developing in the recent years, and the current video object retrieval strategies are used for visualizing, digitizing, modeling, and retrieving the objects especially in graphics and in architectural design. The research performed led to the design of proficient video object retrieval techniques. Yet, although, a number of algorithms had been devised for tracking objects, the problems persist in enhancing the performance, for instance – with regard to non-rigid objects. In this review article we provide a detailed survey of 50 research papers presenting the suggested video object retrieval methodologies, based on approaches such as deep learning techniques, graph-based techniques, query-based techniques, feature-based techniques, fuzzybased techniques, machine learning-based techniques, distance metric learning-based technique, and also other ones. Moreover, analysis and discussion are presented concerning the year of publication, employed methodology, evaluation metrics, accuracy range, adopted framework, datasets utilized, and the implementation tool. Finally, the research gaps and issues related to various proposed video object retrieval schemes are presented for guiding the researchers towards improved contributions to the video object retrieval methods.
Źródło:
Control and Cybernetics; 2020, 49, 4; 471-498
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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