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    Wyświetlanie 1-6 z 6
    Tytuł:
    How to improve efficiency of analysis of sequential data?
    Autorzy:
    Andrzejewski, W.
    Królikowski, Z.
    Morzy, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/970825.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    sequential data
    indexing
    market basket analysis
    Opis:
    Many of todays database applications, including market basket analysis, web log analysis, DNA and protein sequence analysis utilize databases to store and retrieve sequential data. Commercial database management systems allow to store sequential data, but they do not support efficient querying of such data. To increase the efficiency of analysis of sequential data new index structures need to be developed. In this paper we propose an indexing scheme for non-timestamped sequences of sets, which supports set subsequence queries. Our contribution is threefold. First, we describe the index logical and physical structure, second, we provide algorithms for set subsequence queries utilizing this structure, and finally we perform experimental evaluation of the index, which proves its feasibility and advantages in set subsequence query processing.
    Źródło:
    Control and Cybernetics; 2009, 38, 1; 107-126
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic characterization of maize inbred lines and their mutual affinities.
    Autorzy:
    Bulińska-Radomska, Z.
    Adamczyk, J.
    Królikowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2198825.pdf
    Data publikacji:
    2001-06-21
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    Inbred lines
    enzymes
    electrophoresis
    similarity
    pedigree
    heterosis
    maize
    Opis:
    Twenty-five inbred lines of maize assigned to six heterotic groups and developed in Poland were studied electrophoretically to determine their purity and mutual relationships. The electrophoretic data were analyzed by principal component and cluster analyses. All lines (except five) were monomorphic in each enzyme studied. Electrophoretic affinities of inbred lines were, with some exception, were in accordance with the expectation inferred from their pedigrees. Lines of identical pedigree but with small differences in phenotypic or developmental characteristics had the lowest dissimilarity coefficient values and in cluster and principal component analyses behaved accordingly. They showed however diverse levels of clustering and dissimilarity coefficient values, which most likely reflected their departure from the common parental gene pool, which occurred in the course of breeding manipulations. Lines, which had one parent in common, were less similar to each other than those with identical pedigree. The most distinct electrophretically were lines with complex or dissimilar pedigree formulae as was confirmed by cluster and principal component analyses.
    Źródło:
    Plant Breeding and Seed Science; 2001, 45, 1; 11-19
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Predicting access to materialized methods by means of hidden Markov model
    Autorzy:
    Masewicz, M.
    Andrzejewski, W.
    Wrembel, W.
    Królikowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/970822.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    method materialization
    hierarchical materialization
    access prediction
    hidden Markov model
    Opis:
    Method materialization is a promising data access optimization technique for multiple applications, including, in particular object programming languages with persistence, object databases, distributed computing systems, object-relational data warehouses, multimedia data warehouses, and spatial data warehouses. A drawback of this technique is that the value of a materialized method becomes invalid when an object used for computing the value of the method is updated. As a consequence, a materialized value of the method has to be recomputed. The materialized value can be recomputed either immediately after updating the object or just before calling the method. The moment the method is recomputed bears a strong impact on the overall system performance. In this paper we propose a technique of predicting access to materialized methods and objects, for the purpose of selecting the most appropriate recomputation technique. The prediction technique is based on the Hidden Markov Model (HMM). The prediction technique was implemented and evaluated experimentally. Its performance characteristics were compared to: immediate recomputation, deferred recomputation, random recomputation, and to our previous prediction technique, called a PMAP.
    Źródło:
    Control and Cybernetics; 2009, 38, 1; 127-152
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formal model of time point-based sequential data for OLAP-like analysis
    Autorzy:
    Bębel, B.
    Morzy, T.
    Królikowski, Z.
    Wrembel, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/200403.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    OLAP
    sequential data
    formal model
    Opis:
    Numerous nowadays applications generate huge sets of data, whose natural feature is order, e.g,. sensor installations, RFID devices, workflow systems, Website monitors, health care applications. By analyzing the data and their order dependencies one can acquire new knowledge. However, nowadays commercial BI technologies and research prototypes allow to analyze mostly set oriented data, neglecting their order (sequential) dependencies. Few approaches to analyzing data of sequential nature have been proposed so far and all of them lack a comprehensive data model being able to represent and analyze sequential dependencies. In this paper, we propose a formal model for time point-based sequential data. The main elements of this model include an event and a sequence of events. Measures are associated with events and sequences. Measures are analyzed in the context set up by dimensions in an OLAP-like manner by means of the set of operations. The operations in our model are categorized as: operations on sequences, on dimensions, general operations, and analytical functions.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 331-340
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lithospheric structure across the Trans-European Suture Zone in NW Poland based on gravity data interpretation
    Autorzy:
    Królikowski, C.
    Petecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059901.pdf
    Data publikacji:
    2002
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Trans-European Suture Zone
    gravity anomalies
    structural-density model
    gravity stripping
    lithospheric structure
    Opis:
    We provide an analysis of geophysical and geological data from the Baltic segment of the Trans-European Suture Zone (TESZ). The construction of structural and density maps of the Zechstein-Mesozoic-Cenozoic complex has allowed identification of anomalies of basement orgin. As a result of interpretation of these anomalies, major structural elements of the lithosphere have been characterised. According to gravity modelling the crustal structure is more complicated than shown on velocity model along refraction and wide-angle reflection profile LT-7. Long-wavelength anomalies have been modelled in terms of lateral heterogeneity within the lower crust and upper mantle. In order to achieve a match between the observed and calculated gravity effects, it was necessary to assume dense upper mantle beneath the TESZ. Gravity data also indicate the presence of high-density bodies in the upper crust, and a complex transitional zone between crust and upper mantle in the TESZ.
    Źródło:
    Geological Quarterly; 2002, 46, 3; 235-246
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural changes in re-pelletized polymers determined by the TGA method
    Zmiany strukturalne w ponownie przetwarzanych polimerach
    Autorzy:
    Królikowski, B.
    Zimniak, J.
    Frąszczak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073069.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    TGA method
    polymer structure
    reprocessing of polymers
    metoda TGA
    budowa polimerów
    recykling polimerów
    Opis:
    One of main issues in polymer processing is the assessment of phenomena arising in polymers processed by extrusion. The action of the plasticizing system of processing machine (including heating, shearing and kneading operations) causes different changes in the carbon chain structure of polymer, i.e. splitting to shorter elements as well as recombination of radicals what may form fractions of different molecular weight. It can be determined by the TGA procedure which gives more information to better understand changes in polymers. The above mentioned investigation can help to explain the problems arising at processing of selected polymer blends that was revealed in authors’ previous paper.
    Jednym z ważniejszych problemów w przetwarzaniu polimerów jest ocena zjawisk powstających w polimerach poddanych recyklingowi i przetwarzanych metodą wytłaczania. Działanie układu uplastyczniającego maszyny przetwórczej (łącznie z grzaniem, ścinaniem i ugniataniem) wywołuje różne zmiany w budowie łańcucha węglowego, tzn. rozpad łańcucha do krótszych elementów jak również rekombinację rodników, co może powodować powstawanie frakcji tworzyw o różnej masie cząsteczkowej. Można to określić metodą TGA, która może dać więcej informacji w celu zrozumienia zmian, jakie pojawiają się w polimerach. Przedstawione badanie pomaga także wyjaśnić problemy pojawiające się przy przetwarzaniu wybranych mieszanin polimerów, które opisano we wcześniejszej publikacji autorów.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2014, 6; 380--381
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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