Temat: fuzzy database - Prolib Integro

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Tytuł:: Fuzzy SQL queries in standard SQL database
Autorzy:: Kudłacik, P.
Tematy:: fuzzy SQL
fuzzy database
fuzzy sets
SQL
rozmyte bazy danych
zbiory rozmyte; Pokaż więcej
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Powiązania:: https://bibliotekanauki.pl/articles/333473.pdf Link otwiera się w nowym oknie
Opis:: Uncertain queries are very common in many areas of human activity. The problem can be seen particularly in medicine, where expressions like ”very high”, ”low”, ”normal” are commonly used in order to describe different information. However, the most popular data repositories do not allow to form imprecise queries in order to filter information. Therefore, the paper proposes an extension to the standard SQL language allowing anybody to profit from fuzzy database using any SQL engine. The existing approaches employ different mechanisms in order to allow the user to perform fuzzy queries on a database. The most complex solutions modify the database engine itself. However, such approach is strongly bound to the modified server version and must be updated with any development of the original server. Nevertheless, there is possible to store fuzzy information using for instance columns of regular relational database. Therefore, this approach proposes extensions to the query language allowing to use fuzzy information in a query and provides a parser transforming a fuzzy query into a standard SQL. Thus, the database server version is irrelevant. The solution is provided as a module written in multi-platform Java language using popular JDBC database connection.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A fuzzy shape database to support conceptual design
Autorzy:: Zhang, J.
Pham, B.
Chen, P.
Tematy:: odwzorowanie kształtu rozmytego
baza danych rozmyta
projektowanie koncepcyjne
fuzzy shape representation
indexing and retrieval of fuzzy shapes
shape database
fuzzy database
conceptual design; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/970432.pdf Link otwiera się w nowym oknie
Opis:: At the conceptual stage of design, designers only have vague ideas of initial shapes which they gradually refine. These imprecise shapes may be specified by a set of fuzzy shape descriptors which represent the intent of a designer. It is also desirable to be able to save them in a database for future reference or for use as initial shapes for new designs. Most research on fuzzy databases has been focused on theoretical aspects while a fuzzy database is rarely seen in practice, especially in the design area. This paper aims to construct a fuzzy shape database to support shape design by integrating fuzzy data processing and fuzzy querying functions into a conventional database. A possibility-based framework is used for a fuzzy relational database model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Decision support based methods to facilitate 3D volumetric locking in a new peer to peer based spatial database system
Autorzy:: Vert, G.
Morris, A.
Heaton, J. S.
Tematy:: baza danych
logika rozmyta
peer-to-peer
database
fuzzy logic; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/970482.pdf Link otwiera się w nowym oknie
Opis:: Spatial databases present challenges to data management not found in typical RDBMS. Among these is the desire of users for highly distributed access to data. A new peer to peer database model is being developed that supports high distribution and concurrency of information access. Some aspects of the model are presented in this paper. However the new peer to peer model faces the critical problem of how to lock data as it becomes highly distributed. Conceptual methods borrowed from decision support and data mining are proposed to create a new type of locking model based on 3D volumetrics. The methods and mathematics proposed in this paper can become the basis for the implementation of a new type of peer to peer based spatial database system where spatial information flows to where it is needed on demand.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A novel approach to hierarchical contextual bipolar queries : a winnow operator approach
Autorzy:: Kacprzyk, Janusz
Zadrożny, Sławomir
Tematy:: database query
bipolar query
context
fuzzy logic
user intention
user preferences; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/2183491.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A Scheme for Template Security at Feature Fusion Level in Multimodal Biometric System
Autorzy:: Selwal, A.
Gupta, S. K.
Kumar, S.
Tematy:: feature template
biometric data
feature vectors
multimodal biometrics
fuzzy sets
database
feature fusion; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102518.pdf Link otwiera się w nowym oknie
Opis:: Biometrics is the science of human recognition by means of their biological, chemical or behavioural traits. These systems are used in many real life applications simply from biometric based attendance system to providing security at a very sophisticated level. A biometric system deals with raw data captured using a sensor and feature template extracted from raw image. One of the challenges being faced by designers of these systems is to secure template data extracted from the biometric modalities of the user and protect the raw images. In order to minimize spoof attacks on biometric systems by unauthorised users one of the solutions is to use multi-biometric systems. Multi-modal biometric system works by using fusion technique to merge feature templates generated from different modalities of the human. In this work, a novel scheme is proposed to secure template during feature fusion level. The scheme is based on union operation of fuzzy relations of templates of modalities during fusion process of multimodal biometric systems. This approach serves dual purpose of feature fusion as well as transformation of templates into a single secured non invertible template. The proposed technique is irreversible, diverse and experimentally tested on a bimodal biometric system comprising of fingerprint and hand geometry. The given scheme results into significant improvement in the performance of the system with lower equal error rate and improvement in genuine acceptance rate.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Prediction of littoral drift with adaptive neuro-fuzzy inference system
Ocena dryfu morskiego z wykorzystaniem systemu ANFIS [Adaptive Neuro-Fuzzy Inference System]
Autorzy:: Sabet, M S
Naseri, M.A.
Sabet, H.S.
Tematy:: littoral sand drift
coastal zone
adaptive neuro-fuzzy inference system
validation
physical process
database; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/81613.pdf Link otwiera się w nowym oknie
Opis:: The amount of sand moving parallel to a coastline forms a prerequisite for many harbor design projects. Such information is currently obtained through various empirical formulae. Despite so many works in the past, an accurate and reliable estimation of the rate of sand drift has still remained a problem. It is a non-linear process and can be described by chaotic time-series. The current study addresses this issue through the use of Adaptive Neuro-Fuzzy Inference System (ANFIS). ANFIS is about taking an initial fuzzy inference system (FIS) and tuning it with a back propagation algorithm based on the collection of input-output data. ANFIS was developed to predict the sand drift from a variety of causative variables. The structure and algorithm of ANFIS for predicting the rate of sand drift is described. The Adaptive Neuro-Fuzzy Inference System was validated by confi rming its consistency with a database of specifi ed physical process.
W artykule przedstawiono adaptację systemu ANFIS do oceny wielkości dryfu fal piaskowych poruszających się wzdłuż wybrzeża morskiego. Pomimo wielu informacji o charakterze ilościowym oraz jakościowym zebranych w badaniach terenowych oraz opracowanych wzorów empirycznych opisujących analizowane zjawisko, autorzy widzą potrzebę stosowania symulacji zjawiska za pomocą metod numerycznych. Takie możliwości daje omówiony w pracy system ANFIS.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Interval-valued linguistic summaries of databases
Autorzy:: Niewiadomski, A.
Ochelska, J.
Szczepaniak, P. S.
Tematy:: interval-valued fuzzy set
interval-valued linguistic variable
interval-valued linguistic quantifier
linguistic summary of database
interval-valued linguistic summary of database; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/969963.pdf Link otwiera się w nowym oknie
Opis:: The so-called linguistic summaries of databases are the semi-natural language sentences that enable distilling the most relevant information from large numbers of tuples, and present it in the human consistent forms. Recently, the methods of constructing and evaluating linguistic summaries have been based on Zadeh's fuzzy sets, which represent uncertain data. The main aim of the paper is to enhance and generalize the Yager's approach to linguistic summarization of data. This enhancement is based on interval-valued fuzzy sets. The newly presented methods enable handling fuzzy concepts, whose membership degrees are not given by real values explicitly, but are approximated by intervals in [0,1]. From now on, the Yager's approach can be viewed as a special case of the method presented in this paper. Finally, illustrative examples are presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Est-il possible de se mettre d’accord sur le sens à donner au terme de pragmatème ?
Is it possible to agree on the meaning of the term ‘pragmateme’?
Autorzy:: Bogacki, Krzysztof
Tematy:: Defining the terme ‘pragmateme'
autonomous linguistic unit
act of enunciation
classical logic criterion
many-valued fuzzy logic criterion
creating a database of pragmatemes; Pokaż więcej
Wydawca:: Wydawnictwo Uniwersytetu Śląskiego
Powiązania:: https://bibliotekanauki.pl/articles/1789271.pdf Link otwiera się w nowym oknie
Opis:: The term ‘pragmateme’ has been coined relatively recently and therefore its usage is still hesitant and its definitions lack precision. This makes it difficult to delimit the scope of all that relates to the intuition of the term. We believe that two criteria are crucial for the identification of the concept. First, it would signify an autonomous linguistic unit implying an act of enunciation, characterised by the adequacy between selecting an appropriate linguistic segment and its application, with all that it entails as constraints. This criterion derives from classical logic, based on the binary opposition of truth and falsehood. The other element of the definition of the pragmateme is difficult to apply due to its subjectivity. It can be described in terms of many-valued fuzzy logic. It requires that a privileged link be created in the consciousness of langage users between a particular formulation, conveying a given semantic content and other, competing formulations. Neither of the two criteria is correlated with formal exponents, which prevents them from being used in a database compiled for the purpose of creating a dictionary of pragmatemes
Dostawca treści:: Biblioteka Nauki

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