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    Wyświetlanie 1-6 z 6
    Tytuł:
    Identifying limits of scalability in distributed, heterogeneous, layer based monitoring concepts like SLAte
    Autorzy:
    Hilbrich, M.
    Muller-Pfefferkorn, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/305401.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    distributed
    scalable
    slate
    heterogeneous
    grid
    monitoring
    Opis:
    In this paper we present the concept of a scalable job centric monitoring infrastructure. The overall performance of this distributed, layer based architecture called SLAte can be increased by installing additional servers to adapt to the demands of the monitored resources and users. Another important aspect is to offer a uniform global view on all data which are stored distributed to provide an easy access for users or visualisation tools. Additionally we discus the impact of these uniform access layer on scalability.
    Źródło:
    Computer Science; 2012, 13 (3); 23-33
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controllability of consensus heterogeneous multi-agent networks over continuous time scale
    Autorzy:
    Athira, V. S.
    Muni, Vijayakumar S.
    Rafeek, Kallu Vetty Muhammed
    Reddy, Gudala Janardhana
    Powiązania:
    https://bibliotekanauki.pl/articles/31343938.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    multi-agent systems
    controllability
    heterogeneous
    agent models
    Opis:
    The research, presented in this paper, concernes the controllability of a multi-agent network with a directed, unweighted, cooperative, and time-invariant communication topology. The network’s agents follow linear and heterogeneous dynamics, encompassing first-order, second-order, and third-order differential equations over continuous time. Two classes of neighbour-based linear distributed control protocols are considered: the first one utilises average feedback from relative velocities/relative accelerations, and the second one utilises feedback from absolute velocities/absolute accelerations. Under both protocols, the network’s agents achieve consensus in their states asymptotically. We observe that both of the considered dynamical rules exploit the random-walk normalised Laplacian matrix of the network’s graph. By categorising the agents of the network into leaders and followers, with leaders serving as exogenous control inputs, we analyse the controllability of followers within their state space through the influence of leaders. Specifically, matrix-rank conditions are established to evaluate the leader– follower controllability of the network under both control protocols. These matrix-rank conditions are further refined in terms of the system matrices’ eigenvalues and eigenvectors. The inference diagrams presented in this work provide deeper insights into how leader– follower interactions impact the network controllability. The efficacy of the theoretical findings is validated through numerical examples.
    Źródło:
    Control and Cybernetics; 2023, 52, 2; 199-245
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Evaluation of a Zone-based Three-level Heterogeneous Clustering Protocol for WSNs
    Autorzy:
    Rao, Sanapala Shanmukha
    Shilpi
    Kumar, Arvind
    Powiązania:
    https://bibliotekanauki.pl/articles/24200745.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    clustering
    heterogeneous
    network lifetime
    stability period
    zone-based WSN
    Opis:
    This paper proposes a zone-based three-level heterogeneous clustering protocol (ZB-TLHCP) for heterogeneous WSNs. In ZB-TLHCP, the sensor field/region is divided into zones where super, advance, and normal nodes are deployed uniformly and randomly. The performance of the proposed ZB-TLHCP system is compared with that of zonal-stable election protocol (Z-SEP), distributed energy efficient clustering (DEEC), and threshold-based DEEC (TDEEC) protocol by varying the number of super and advance nodes, their energy levels for the fixed sensor field, and the total number of nodes. Matlab simulation results revealed that the proposed ZB-TLHCP solution performed better than Z-SEP, DEEC, and TDEEC protocols, as it increased the instability period, prolonged the network's lifetime, and achieved higher throughput values.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 3; 85--93
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic of Vertical Reynolds Shear Stress in a Patchy Heterogeneous Open Channel
    Autorzy:
    Olatunji, Peter Folorunso
    Powiązania:
    https://bibliotekanauki.pl/articles/1177793.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Reynolds Stress
    gravel
    heterogeneous
    open channel
    patchy
    turbulence
    vegetation
    Opis:
    In turbulent flow, the Reynolds stress provides an understanding of the shear dispersion within the flow. Turbulence can be said to have an effect equivalent to the Reynolds shear stresses and are indicators of turbulence transport. This paper examined the characteristic of vertical Reynolds Shear stress in a patchy heterogeneous open channel using two experimental conditions for flexible and rigid vegetation interaction with gravel bed. The results show the value of vertical Reynolds stress decreases downstream along the channel section and as the distance from change in roughness increases. This is attributed to the effects of the bed roughness configuration (due to the preceding vegetated bed roughness) on the vertical Reynolds stress distribution. However, the position of maximum vertical Reynolds stress is located near bed over the vegetated zone. This provides an indication that the vegetated bed serves as the primary source of turbulence for the flow.
    Źródło:
    World Scientific News; 2018, 99; 1-14
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of heterogeneous nucleation on thermodynamic properties of isotactic polypropylene
    Autorzy:
    Barczewski, M.
    Dobrzyńska-Mizera, M.
    Trzeciak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/778993.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    isotactic polypropylene
    PP
    heterogeneous
    nucleation
    modification
    sorbitol
    DMTA
    DSC
    Opis:
    In this paper we have investigated the effect of 1,2,3-trideoxy-4,6:5,7-bis-O-[(4-propylphenyl)methylene]-nonitol sorbitol used in varying amounts (0.01 - 1 wt %) on isotactic polypropylene (iPP) matrix. We have used dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC) to study glass transition temperatures and crystallinity as a function of the nucleating agent concentration. Isotactic polypropylene samples showed a strong dependency on amount of α nucleating agent used. An increasing content of sorbitol based nucleating agent led to an increase of crystallization temperature upon cooling from the melt at constant rate and a decrease of the glass transition temperatures.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 4; 71-74
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical resistivity tomography for spatiotemporal variations of soil moisture in a precision irrigation experiment
    Autorzy:
    Mertzanides, Y.
    Tsakmakis, I.
    Kargiotis, E.
    Sylaios, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082914.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    electrical resistivity tomography
    non-intrusive
    soil measurements
    soil moisture determination
    heterogeneous
    clay-rich soils
    water-saving technology
    Opis:
    Soil moisture temporal variations play a key role in the hydrological processes occurring in the unsaturated zone, which are critical for annual crop yields. The electrical resistivity tomography technique was applied in a field cultivated with cotton in northern Greece, thereby investigating its potential to serve as a reliable soil moisture-monitoring tool for precision irrigation in highly heterogeneous, clay-rich soils. Repeated surface resistivity measurements were made along two plant lines combined with soil water content measurements conducted with a reference gravimetric method and an electromagnetic sensor. Resistivity pseudo-sections were inverted to produce 2D resistivity models, and time-lapse inversion algorithms were also used, to better calculate the temporal changes in subsurface soil resistivity. The results showed clear spatial and temporal changes in resistivity transects in accordance with rainfall/irrigation and dry periods. The soil resistivity data exhibited a power model relationship with gravimetric soil moisture point measurements and a fair correlation with electromagnetic sensor profiles.
    Źródło:
    International Agrophysics; 2020, 34, 3; 309-319
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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