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    Wyświetlanie 1-7 z 7
    Tytuł:
    Modeling learning on dynamic behaviour of synapses
    Autorzy:
    Fernando, S.
    Cho, Y. I.
    Nakamura, Y.
    Matsuzaki, S.
    Marasinghe, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/333128.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    nauczanie
    krótkoterminowa plastyczność
    długoterminowa plastyczność
    plastyczność synaptyczna
    learning
    short-term plasticity
    long-term plasticity
    agent systems
    Opis:
    Learning is a process involved in multiple timescales. As per biology, changes which last from milliseconds to seconds and hours to days are the main mediators for the formation of short-term and long-term memory. It is obvious that, memory formation is neither static nor it is restricted into a one phase of life. Every step we keep in our life, even it succeed or fail or no matter what happen, we learn from them and acquire invaluable knowledge on that, which makes us easy manipulation on similar events in future. Thus continuous learning in a dynamic environment is a necessary qualification for the researches which are interested in studying phenomena, such as addiction, stress, noise, etc on such a dynamic learning environments. This research proposes a new approach of modelling our nervous system with the intention of implementing learning on dynamic environment.
    Źródło:
    Journal of Medical Informatics & Technologies; 2009, 13; 175-180
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Loop-shaping h∞ control of an aeropendulum model
    Autorzy:
    Breganon, Ricardo
    Alves, Uiliam Nelson L. T.
    De Almeida, João Paulo L.S.
    Ribeiro, Fernando S. F.
    Mendonça, Marcio
    Palácios, Rodrigo H. C.
    Montezuma, Marcio A. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106458.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    modelowanie dynamiczne
    wahadło aerodynamiczne
    sterowanie
    dynamic system modeling
    aeropendulum
    H∞ control
    Opis:
    This work presents a mathematical model of an aeropendulum system with two sets of motors with propellers and the design and simulation of a loop-shaping h∞control for this system. In this plant, the objective is to control the angular position of the pendulum rod through the torque generated by the thrust of the motorized propellers at the end of the rod’s axis. The control design is obtained by first using feedback linearization and then designing the h∞ controller using the resulting linear system. For the control strategy validation, simulations were conducted in the Matlab/Simulink® environment, and the weighting functions for the h∞ controller were adjusted to obtain the desired performance and stability of the closed-loop system. The simulation results show the efficiency of the applied methodology.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 1--16
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new mid-Permian burnetiamorph therapsid from the Main Karoo Basin of South Africa and a phylogenetic review of Burnetiamorpha
    Autorzy:
    DAY, MICHAEL O.
    RUBIDGE, BRUCE S.
    ABDALA, FERNANDO
    Powiązania:
    https://bibliotekanauki.pl/articles/945447.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Discoveries of burnetiamorph therapsids in the last decade and a half have increased their known diversity but they remain a minor constituent of middle–late Permian tetrapod faunas. In the Main Karoo Basin of South Africa, from where the clade is traditionally best known, specimens have been reported from all of the Permian biozones except the Eodicynodon and Pristerognathus assemblage zones. Although the addition of new taxa has provided more evidence for burnetiamorph synapomorphies, phylogenetic hypotheses for the clade remain incongruent with their appearances in the stratigraphic column. Here we describe a new burnetiamorph specimen (BP/1/7098) from the Pristerognathus Assemblage Zone and review the phylogeny of the Burnetiamorpha through a comprehensive comparison of known material. Phylogenetic analysis suggests that BP/1/7098 is closely related to the Russian species Niuksenitia sukhonensis. Remarkably, the supposed mid-Permian burnetiids Bullacephalus and Pachydectes are not recovered as burnetiids and in most cases are not burnetiamorphs at all, instead representing an earlier-diverging clade of biarmosuchians that are characterised by their large size, dentigerous transverse process of the pterygoid and exclusion of the jugal from the lateral temporal fenestra. The evolution of pachyostosis therefore appears to have occurred independently in these genera. The resulting biarmosuchian tree is significantly more congruent with the stratigraphic appearance of its constituent taxa than in previous phylogenetic hypotheses and, consequently, does not necessarily constrain the diversification of the Burnetiamorpha to before the Capitanian.
    Źródło:
    Acta Palaeontologica Polonica; 2016, 61, 4; 701-719
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The sixth sense in mammalian forerunners: variability of the parietal foramen and the evolution of the pineal eye in South African Permo-Triassic eutheriodont therapsids
    Autorzy:
    BENOIT, JULIEN
    ABDALA, FERNANDO
    MANGER, PAUL R.
    RUBIDGE, BRUCE S.
    Powiązania:
    https://bibliotekanauki.pl/articles/945457.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    therapsida
    pineal
    parietal foramen
    third eye
    endothermy
    permian
    triassic
    south africa
    Opis:
    In some extant ectotherms, the third eye (or pineal eye) is a photosensitive organ located in the parietal foramen on the midline of the skull roof. The pineal eye sends information regarding exposure to sunlight to the pineal complex, a region of the brain devoted to the regulation of body temperature, reproductive synchrony, and biological rhythms. The parietal foramen is absent in mammals but present in most of the closest extinct relatives of mammals, the Therapsida. A broad ranging survey of the occurrence and size of the parietal foramen in different South African therapsid taxa demonstrates that through time the parietal foramen tends, in a convergent manner, to become smaller and is absent more frequently in eutherocephalians (Akidnognathiidae, Whaitsiidae, and Baurioidea) and non-mammaliaform eucynodonts. Among the latter, the Probainognathia, the lineage leading to mammaliaforms, are the only one to achieve the complete loss of the parietal foramen. These results suggest a gradual and convergent loss of the photoreceptive function of the pineal organ and degeneration of the third eye. Given the role of the pineal organ to achieve fine-tuned thermoregulation in ectotherms (i.e., “cold-blooded” vertebrates), the gradual loss of the parietal foramen through time in the Karoo stratigraphic succession may be correlated with the transition from a mesothermic metabolism to a high metabolic rate (endothermy) in mammalian ancestry. The appearance in the eye of melanopsin-containing retinal ganglion cells replacing the photoreceptive role of the pineal eye could also have accompanied its loss.
    Źródło:
    Acta Palaeontologica Polonica; 2016, 61, 4; 777-789
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear optical properties of photonic crystals
    Autorzy:
    Fernando, M. G. Pravini S.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1177892.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    AlGaAs
    All-optical switch
    FDTD
    GaAs
    Ge
    Kerr nonlinearity
    Limiter
    Photonic crystals
    ZnS
    side coupled Micro cavities
    Opis:
    A model for optical switching and limiting in 2D photonic crystals of square and hexagonal lattice structures having Kerr nonlinearity is introduced with a side-coupled cavity and a waveguide. MATLAB was used to implement FDTD algorithm with perfectly matched layer boundaries. Photonic crystals formed from AlGaAs, GaAs, ZnS and Ge, rods in air were simulated to obtain the optimal parameters. The best refractive index range for the proposed switch and the limiter to be operated is 2.5 to 3.2. The results showed best performance for group III-V materials. The lattice constant for the most commonly used telecommunication wavelength (1.55 µm) was found to be 0.5479 µm for AlGaAs and 0.550 µm for GaAs respectively. As an optical limiter, AlGaAs showed the best performance with the threshold refractive index change at 0.05.
    Źródło:
    World Scientific News; 2018, 97; 1-27
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness of the pharmacological interventions on abstinence of substance abuse disorder.
    Autorzy:
    Jayamaha, Akila R.
    Herath, Nimesha D.M.
    Nawarathne, Lahiru C.
    Samarakoon, Nirmani A. W.
    Ranadeva, Nadeeka D. K.
    Dharmarathna, Nishadi D.
    Buddhini, Divithuragamage H.
    Priyadarshani, Nirmala
    Senarath, Samanthi N.
    Arachchi, Piyumali S.
    Samarasinghe, Kerstin L.
    Fernando, Neluka
    Powiązania:
    https://bibliotekanauki.pl/articles/1918241.pdf
    Data publikacji:
    2021-12-31
    Wydawca:
    Towarzystwo Pomocy Doraźnej
    Tematy:
    Substance abuse disorder
    rehabilitation
    pharmacological interventions
    PRISMA
    empirical
    Opis:
    The abundance of pharmacological interventions to treat substance abuse disorder has solidified globally. Despite promising effects, use of pharmacological interventions in substance abuse disorder are limited in asian territories. This study aimed to identify and explore existing effective pharmacological interventions on abstinence of substance abuse disorder. A systematic review was conducted adhering to PRISMA guidelines. Google scholar, Pubmed, Hinari, and Cochrane databases were systematically searched and the topic and abstract of the articles were screened for eligibility. Articles of empirical studies on pharmacological interventions on abstinence of substance abuse disorder, which were published in peer-reviewed journals during 2010 to 2020, written in English, were included and articles on alcohol and smoking cessation were excluded from the review. Full papers were then assessed against eligibility criteria. Quality appraisal and data extraction of the selected articles were performed by two independent reviewers and discrepancies were discussed with another independent reviewer to reach consensus. Three hundred and seven research articles were identified through a comprehensive database search. After screening the topics and abstracts of the articles and assessing the relevant full texts for eligibility, 26 articles of the empirical studies were included in the systematic review. High doses of Buprenorphine, Methadone, Lofexidine, Naltrexone, SB-334867, Prazosin, and Baclofen were identified to be significantly effective in abstinence from substance abuse. It was concluded that empirical evidence of effective pharmacological interventions exists and its combination with existing non-pharmacological rehabilitation interventions are proposed as more effective in the treatment of substance abuse
    Źródło:
    Critical Care Innovations; 2021, 4, 4; 19-33
    2545-2533
    Pojawia się w:
    Critical Care Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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