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Wyszukujesz frazę "Hołyst, J." wg kryterium: Autor

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    Wyświetlanie 1-13 z 13
    Tytuł:
    Model of Communities Isolation at Hierarchical Modular Networks
    Autorzy:
    Kondratiuk, P.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1409004.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.75.Hc
    02.50.-r
    89.75.-k
    89.75.Da
    89.75.Fb
    Opis:
    The model of community isolation was extended to the case when individuals are randomly placed at the nodes of hierarchical modular networks. It was shown that the average number of blocked nodes (individuals) increases in time as a power function, with the exponent depending on the network parameters. The distribution of the time when the first isolated cluster appears is unimodal, non-gaussian. The developed analytical approach is in a good agreement with the simulation data.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2B; B-67-B-71
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regular and Chaotic Behaviour of a Kicked Damped Spin
    Autorzy:
    Hołyst, J.
    Sukiennicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920483.pdf
    Data publikacji:
    1992-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.+b
    75.10.Hk
    Opis:
    The dynamics of a kicked, anisotropic, damped spin is reduced to a two-dimensional map. This map exhibits such features as bifurcation diagrams, regular or chaotic attractors/repellors and intermittent-like transitions between two strange attractors. With increase of damping a transition from chaos to the fixed point attractor occurs. On the contrary to the Hamiltonian case the type of magnetic anisotropy plays a crucial role for damped models.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 3; 353-360
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Threshold Model of Financial Markets
    Autorzy:
    Sieczka, P.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812221.pdf
    Data publikacji:
    2008-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.65.Gh
    Opis:
    We proposed a model of interacting market agents based on the generalized Ising spin model. The agents can take three actions: "buy", "sell", or "stay inactive". We defined a price evolution in terms of the system magnetization. The model reproduces main stylized facts of real markets such as: fat-tailed distribution of returns and volatility clustering.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 3; 525-530
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transitions to Chaos and Chaos Synchronization for Solitons in the Presence of Spatially Inhomogeneous Forces
    Autorzy:
    Fronczak, P.
    Hołyst, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030484.pdf
    Data publikacji:
    2002-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Pq
    05.45.Yv
    Opis:
    Motion of kink solitons in the φ$\text{}^{4}$ model in the presence of external spatially inhomogeneous forces is studied. Depending on the system parameters various routes to chaos, i.e. Feigenbaum's scenario, type-I intermittency, and chaos-chaos intermittency are observed. Synchronization of chaotic solitons is investigated.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 4; 465-476
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hierarchical Cont-Bouchaud Model
    Autorzy:
    Paluch, R.
    Suchecki, K.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1388158.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.65.-s
    89.65.Gh
    89.75.-k
    05.40.-a
    Opis:
    We extend the well-known Cont-Bouchaud model to include a hierarchical topology of agent's interactions. The influence of hierarchy on system dynamics is investigated by two models. The first one is based on a multi-level, nested Erdős-Rényi random graph and individual decisions by agents according to Potts dynamics. This approach does not lead to a broad return distribution outside a parameter regime close to the original Cont-Bouchaud model. In the second model we introduce a limited hierarchical Erdős-Rényi graph, where merging of clusters at a level h+1 involves only clusters that have merged at the previous level h and we use the original Cont-Bouchaud agent dynamics on resulting clusters. The second model leads to a heavy-tail distribution of cluster sizes and relative price changes in a wide range of connection densities, not only close to the percolation threshold.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3A; A-108-A-112
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On-Line Noise Suppression for Enhancing Speech Recognition
    Autorzy:
    Urbanowicz, K.
    Fronczak, P.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807766.pdf
    Data publikacji:
    2009-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Tp
    43.72.Dv
    43.50.Ki
    43.72.Ne
    Opis:
    An experimental setup has been designed that makes possible a real-time noise reduction and an increase of automatic word recognition rate. The applied algorithm uses a dynamical filtering method for investigated time-series and has been implemented in Spartan 3 FPGA evaluation board RC10 made by Celoxica. We show that our approach increases the number of correctly recognized words in the commercial speech recognition program ViaVoice 10.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 2; 119-126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Key Courses of Academic Curriculum Uncovered by Data Mining of Students Grades
    Autorzy:
    Gajewski, Ł.
    Chołoniewski, J.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398901.pdf
    Data publikacji:
    2016-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.65.-s
    89.65.Ef
    Opis:
    Learning is a complex cognitive process that depends not only on an individual capability of knowledge absorption but it can be also influenced by various group interactions and by the structure of an academic curriculum. We have applied methods of statistical analyses and data mining (principal component analysis and maximal spanning tree) for anonymized students' scores at Faculty of Physics, Warsaw University of Technology. A slight negative linear correlation exists between mean and variance of course grades, i.e. courses with higher mean scores tend to possess a lower scores variance. There are courses playing a central role, e.g. their scores are highly correlated to other scores and they are in the centre of corresponding maximal spanning trees. Other courses contribute significantly to students' score variance as well to the first principal component and they are responsible for differentiation of students' scores. Correlations of the first principal component to courses' mean scores and scores variance suggest that this component can be used for assigning ECTS points to a given course. The analysis is independent of declared curricula of considered courses. The proposed methodology is universal and can be applied for analysis of students' scores and academic curriculum at any faculty.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 5; 1071-1076
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emotional Agents at the Square Lattice
    Autorzy:
    Czaplicka, A.
    Chmiel, A.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538563.pdf
    Data publikacji:
    2010-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.75.Fb
    89.65.Ef
    Opis:
    We introduce and investigate by numerical simulations a number of models of emotional agents at the square lattice. Our models describe the most general features of emotions such as the spontaneous emotional arousal, emotional relaxation, and transfers of emotions between different agents. Group emotions in the considered models are periodically fluctuating between two opposite valency levels and as result the mean value of such group emotions is zero. The oscillations amplitude depends strongly on probability p_{s} of the individual spontaneous arousal. For small values of relaxation times τ we observed a stochastic resonance, i.e. the signal to noise ratio SNR is maximal for a non-zero $p_{s}$ parameter. The amplitude increases with the probability p of local affective interactions while the mean oscillations period increases with the relaxation time τ and is only weakly dependent on other system parameters. Presence of emotional antenna can enhance positive or negative emotions and for the optimal transition probability the antenna can change agents emotions at longer distances. The stochastic resonance was also observed for the influence of emotions on task execution efficiency.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 4; 688-694
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Simple Model of Local Prices and Associated Risk Evaluation
    Autorzy:
    Urbanowicz, K.
    Hołyst, J.
    Richmond, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812217.pdf
    Data publikacji:
    2008-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.65.Gh
    75.10.Hk
    Opis:
    A simple spin system is constructed to simulate dynamics of asset prices and studied numerically. The outcome for the distribution of prices is shown to depend both on the dimension of the system and the introduction of price into the link measure. For dimensions below 2, the associated risk is high and the price distribution is bimodal. For higher dimensions, the price distribution is Gaussian and the associated risk is much lower. It is suggested that the results are relevant to rare assets or situations where few players are involved in the deal making process.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 3; 501-506
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Role of Emotional Variables in the Classification and Prediction of Collective Social Dynamics
    Autorzy:
    Chołoniewski, J.
    Sienkiewicz, J.
    Hołyst, J.
    Thelwall, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1388316.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.50.-r
    07.05.Hd
    89.20.Hh
    Opis:
    We demonstrate the power of data mining techniques for the analysis of collective social dynamics within British Tweets during the Olympic Games 2012. The classification accuracy of online activities related to the successes of British athletes significantly improved when emotional components of tweets were taken into account, but employing emotional variables for activity prediction decreased the classifiers' quality. The approach could be easily adopted for any prediction or classification study with a set of problem-specific variables.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3A; A-21-A-28
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical Analysis of Emotions and Opinions at Digg Website
    Autorzy:
    Pohorecki, P.
    Sienkiewicz, J.
    Mitrović, M.
    Paltoglou, G.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400182.pdf
    Data publikacji:
    2013-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.50.-r
    07.05.Hd
    89.20.Hh
    89.70.Cf
    Opis:
    We performed statistical analysis on data from the Digg.com website, which enables its users to express their opinion on news stories by taking part in forum-like discussions as well as to directly evaluate previous posts and stories by assigning so called "diggs". Owing to fact that the content of each post has been annotated with its emotional value, apart from the strictly structural properties, the study also includes an analysis of the average emotional response of the comments about the main story. While analysing correlations at the story level, an interesting relationship between the number of diggs and the number of comments that a story received was found. The correlation between the two quantities is high for data where small threads dominate and consistently decreases for longer threads. However, while the correlation of the number of diggs and the average emotional response tends to grow for longer threads, correlations between numbers of comments and the average emotional response are almost zero. We also suggest presence of two different mechanisms governing the evolution of the discussion and, consequently, its length.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 3; 604-615
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emotional Analysis of Blogs and Forums Data
    Autorzy:
    Weroński, P.
    Sienkiewicz, J.
    Paltoglou, G.
    Buckley, K.
    Thelwall, M.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1408915.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.50.-r
    07.05.Hd
    89.20.Hh
    89.70.Cf
    Opis:
    We perform a statistical analysis of emotionally annotated comments in two large online datasets, examining chains of consecutive posts in the discussions. Using comparisons with randomised data we show that there is a high level of correlation for the emotional content of messages.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2B; B-128-B-132
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biometria w systemach uwierzytelniania
    Biometry in the authentication systems
    Autorzy:
    Hołyst, B.
    Pomykała, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/208952.pdf
    Data publikacji:
    2011
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    wzorzec biometryczny
    bezpieczeństwo danych
    tożsamość cyfrowa
    kryptologia
    podpis cyfrowy
    informatyka kryminalistyczna
    authentication
    biometric pattern
    data security
    digital identity
    cryptology
    digital signature
    forensic science
    Opis:
    Artykuł prezentuje interdyscyplinarną perspektywę metod uwierzytelniania stosowanych we współczesnej gospodarce elektronicznej. Prezentowane są aspekty informatyczne kryminalistyczne prawne a także etyczne związane z systemami uwierzytelniania ze szczególnym uwzględnieniem metod biometrycznych. Analizowane są systemy uwierzytelniania wykorzystujące różne charakterystyki biometryczne. Zaakcentowany został także wymiar kryptograficzny metod uwierzytelniania oraz istotne problemy zarządzania tożsamością cyfrową. Podajemy szereg przypadków użycia analizując dokładniej system paszportu biometrycznego i rozwiązanie stosowane aktualnie w Polsce.
    The article presents the interdisciplinary perspective of authentication methods in the context of the current ecommerce development. The presented aspects deal with such domains as computer science, forensic science, legal science, biometry, ethics and cryptography. The authentication systems based on the various biometric characteristics are investigated. The cryptographic approach related to the management of the digital identity is presented. As a case study we consider the system of biometric passport used currently in Poland.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 4; 412-438
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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