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Wyświetlanie 1-15 z 44
Tytuł:
Experiments on Synchronizing Automata
Autorzy:
Roman, Adam
Powiązania:
https://bibliotekanauki.pl/articles/1373417.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Opis:
This work is motivated by the Černý Conjecture – an old unsolved problem in the automata theory. We describe the results of the experiments on synchronizing automata, which have led us to two interesting results. The first one is that the size of an automaton alphabet may play an important role in the issue of synchronization: we have found a 5-state automaton over a 3-letter alphabet which attains the upper bound from the Černý Conjecture, while there is no such automaton (except Černý automaton $C_5$) over a binary alphabet. The second result emerging from the experiments is a theorem describing the dependencies between the automaton structure $S$ expressed in terms of the so-called merging system and the maximal length of all minimal synchronizing words for automata of type $S$.
Źródło:
Schedae Informaticae; 2010, 19; 35-51
0860-0295
2083-8476
Pojawia się w:
Schedae Informaticae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the number of clusterings in a hierarchical classication model with overlapping clusters
Autorzy:
Roman, Adam
Podolak, Igor T.
Deszyńska, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1373524.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Opis:
This paper shows a new combinatorial problem which emerged from studies on an artificial intelligence classification model of a hierarchical classifier. We introduce the notion of proper clustering and show how to count their number in a special case when 3 clusters are allowed. An algorithm that generates all clusterings is given. We also show that the proposed approach can be generalized to any number of clusters, and can be automatized. Finally, we show the relationship between the problem of counting clusterings and the Dedekind problem.
Źródło:
Schedae Informaticae; 2011, 20; 137-159
0860-0295
2083-8476
Pojawia się w:
Schedae Informaticae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the consistency of sieve bootstrap prediction intervals for stationary time series
Autorzy:
Różański, Roman
Zagdański, Adam
Powiązania:
https://bibliotekanauki.pl/articles/729798.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
prediction intervals
sieve bootstrap
method of sieves
Opis:
In the article, we consider construction of prediction intervals for stationary time series using Bühlmann's [8], [9] sieve bootstrapapproach. Basic theoretical properties concerning consistency are proved. We extend the results obtained earlier by Stine [21], Masarotto and Grigoletto [13] for an autoregressive time series of finite order to the rich class of linear and invertible stationary models. Finite sample performance of the constructed intervals is investigated by computer simulations.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2004, 24, 1; 5-40
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Postsecular or Post-Traditional? Slovakia between Tradition and Secularization
Autorzy:
Kečka, Roman
Lipszyc, Adam
Sławek, Tadeusz
Powiązania:
https://bibliotekanauki.pl/chapters/979087.pdf
Data publikacji:
2019-02-22
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
post-traditional
postsecular
secularity
religiosity
desecularization
Slovakia
Opis:
This article discusses today’s complex religious situation in Slovakia, pondering the adequacy of the concepts usually used in this context. The last three decades have shown that the Western concepts of secularization, desecularization and/or post-secularism do not completely fit the Slovak religious reality that obviously goes beyond the Western conceptual horizon. While the countries in Western Europe are undergoing a postsecular turn, this does not seem to be the case in Slovakia, which has instead seen a very dynamic post-traditional turn characterized not only by belonging to a church and attending its services, but also by an openness to new spiritual possibilities outside the institutional ecclesiastical milieu. In the conditions of a modern society, post-traditional Christianity in Slovakia is experiencing transformations and adaptations of traditional religious forms. The case of Slovakia suggests that the contemporary academic study of religion has to learn how to ask correct, up-to-date questions on religion and non-religion to get the big picture and the details of the dynamics of the actual religious landscape in Slovakia.
Źródło:
The Experience of Faith in Slavic Cultures and Literatures in the Context of Postsecular Thought; 84-103
9788323537175
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The estimation of CO2 storage potential of a gas-bearing shale succession at the early stage of reservoir characterization : a case study from the Baltic Basin (Poland)
Autorzy:
Wójcicki, Adam
Jarosiński, Marek
Roman, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2058853.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
carbon dioxide
storage capacity assessment
shale gas reservoir
sorption
pores
fractures
Opis:
Estimation of the CO2 storage potential of gas-bearing shales in the Lower Paleozoic Baltic Basin is at an early stage of reservoir exploration and production, based on data from one vertical exploration borehole, supplemented with some information from adjacent boreholes. The borehole section examined is 120 m long and comprises three intervals enriched with organic matter separated by organic-poor intervals. In our approach, the storage capacity is represented by: (1) sorption potential of organic matter, (2) open pore space and (3) potential fracture space. The potential for adsorbed CO2 was determined from Langmuir isotherm parameters taken from laboratory measurements and recalculated from CH4 adsorption curves. The pore space capacity was estimated in two ways: by utilizing results of laboratory measurements of dynamic capacity for pores >100 nm and using results of helium porosimetry, the first of these being considered as the most relevant. Due to the low permeability of the shale matrix we have adopted the standard assumption that the CO2 is able to reach effectively only 10% of the theoretical total sorption and pore volume. For hydraulic fracture space, the theoretical maximum opening of vertical fractures in the direction of minimum horizontal stress was considered, decreased by the expected portion of fracturing fluid flowback and by partial fracture closure by burial compaction. The effectiveness of three CO2 storage categories for the individual organic-rich and organic-poor shale units shows an obvious positive correlation of TOC content with the storage efficiency by sorption and within pore space, and a negative correlation with the storage efficiency in hydraulic fractures. It was estimated that sorption, over the maximum storage interval (120 m thick), is responsible for ~76% of total storage capacity, pore space accounts for 13% (for the most relevant porosity model) while the contribution of fractures is about 11%. In the minimum storage interval (35 m thick, including the best quality shales) the estimated proportions of sorption, pore space and fractures in the total storage capacity are 84, 10 and 6% respectively. Finally, the result for the best quality storage interval (35 m thick) was compared with the Marcellus Shale of similar thickness (average ~38 m) and with other options of CO2 storage in Poland. The most organic-rich units in the area studied have a CO2 storage capacity efficiency (i.e. storage capacity per volume unit of shale) only slightly less than average for the Marcellus Shale, because sorption capacity – the dominant component – is comparable in both cases. However, the open pore space capacity in the Marcellus Shale appears to be far higher, even if the potential fracture space calculated for the borehole studied is taken into consideration, probably because the free gas content in the Marcellus Shale is far higher than in the Baltic Basin. CO2 storage in depleted shale gas wells is not a competitive solution compared to storage in saline aquifer structures or in larger hydrocarbon fields.
Źródło:
Geological Quarterly; 2021, 65, 1; 3
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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