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    Wyświetlanie 1-8 z 8
    Tytuł:
    Qualitative analysis of controlled drug resistance model - inverse Laplace and and semigroup approach
    Autorzy:
    Świerniak, A.
    Polański, A.
    Kimmel, M.
    Bobrowski, A.
    Śmieja, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/205965.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    modele biomedyczne
    proces gałązkowy
    stabilność
    układy nieskończenie wymiarowe
    biomedical models
    branching processes
    infinite dimensional systems
    stability
    Opis:
    In this paper we study some properties of infinite models of the controlled evolution of drug resistance. We combine asymptotic techniques used in previous studies of similar models with methods of control theory and of semigroup theory. It enables us to find conditions for stability of the model both when the sensitive population is annihilated and when there exists a permanent influx from the sensivite compartment into drug resistant one. The conditions are expressed in terms of relationships between amplification and deamplification ratios as well as average life times of cells and intensity of anticancer drug action.
    Źródło:
    Control and Cybernetics; 1999, 28, 1; 61-73
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal multidrug treatment in the presence of drug resistance stemming from gene amplification
    Autorzy:
    Śmieja, J.
    Świerniak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332869.pdf
    Data publikacji:
    2002
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    nieskończenie wymiarowy system
    optymalna kontrola
    modelowanie biomedyczne
    infinite dimensional systems
    optimal control
    biomedical modeling
    Opis:
    The paper is concerned with development of optimal treatment protocols that take into account both action of several drugs and the evolution of drug resistance. It is a result of analysis of evolution of drug resistance in cancer population but presented methodology can be applied in any case involving drug resistance stemming from gene amplification. First, a biological background is given. In subsequent sections of the paper, the developed technique is presented and some early analytical results, which form a basis for more precise modeling, are shown. Afterwards, the model description is transformed into a vector integro-differential equation, which makes it possible to define necessary conditions of optimal solution to the minimization problem arising from the search for the optimal treatment. Finally, some remarks on the model applicability are presented.
    Źródło:
    Journal of Medical Informatics & Technologies; 2002, 3; MI13-19
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Different Models of Chemotherapy Taking Into Account Drug Resistance Stemming from Gene Amplification
    Autorzy:
    Śmieja, J.
    Świerniak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/908161.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    medycyna
    automatyka
    biomedical modelling
    infinite dimensional systems
    multivariable control
    Opis:
    This paper presents an analysis of some class of bilinear systems that can be applied to biomedical modelling. It combines models that have been studied separately so far, taking into account both the phenomenon of gene amplification and multidrug chemotherapy in their different aspects. The mathematical description is given by an infinite dimensional state equation with a system matrix whose form allows decomposing the model into two interacting subsystems. While the first one, of a finite dimension, can have any form, the other is infinite dimensional and tridiagonal. A methodology of the analysis of such models, based on system decomposition, is presented. An optimal control problem is defined in the l1 space. In order to derive necessary conditions for optimal control, the model description is transformed into an integro-differential form. Finally, biomedical implications of the obtained results are discussed.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2003, 13, 3; 297-305
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomedical applications of Bluetooth technology
    Biomedyczne zastosowania technologii Bluetooth
    Autorzy:
    Penkala, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/153398.pdf
    Data publikacji:
    2006
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    technologia Bluetooth
    urządzenia Bluetooth
    sprzęt biomedyczny
    medyczne systemy bezprzewodowe
    telemedycyna
    sensory biomedyczne
    opieka domowa
    pomiar częstości pulsu
    respirometria
    elektrokardiografia holterowska
    Bluetooth technology
    Bluetooth devices
    biomedical equipment
    medical wireless systems
    telemedicine
    biomedical sensors
    pulse rate measurement
    respirometry
    Holter Electrocardiography
    Opis:
    In the paper the features of Bluetooth wireless mobile communication technology important in biomedical applications are discussed. Comparison with other wireless technologies in this field is presented. Several examples of prototype medical systems using Bluetooth devices are also shown as well as prospective applications of this technology in wireless, wearable Bluetooth-compatible biomedical sensors. Some of the author's own concepts concerning the Bluetooth technology usage models for wireless health care systems are described. Currently developed own prototype Bluetooth systems for wireless pulse rate measurement, respirometry and Holter Electrocardiography are described as well as some other projects for home care applications.
    W artykule przeanalizowano właściwości bezprzewodowej, mobilnej technologii komunikacyjnej Bluetooth, istotne z punktu widzenia zastosowań biomedycznych. Zaprezentowano porównanie z innymi bezprzewodowymi technologiami stosowanymi w tej dziedzinie. Opisano przykłady prototypowych systemów medycznych z wykorzystaniem urządzeń Bluetooth, a także możliwe zastosowania tej technologii w rozwiązaniach bezprzewodowych, zdatnych do noszenia na ciele biosensorów. Przedstawiono własne koncepcje autora związane z modelami zastosowań technologii Bluetooth w systemach opieki zdrowotnej. Opisane zostały opracowane ostatnio własne prototypowe systemy Bluetooth do bezprzewodowych pomiarów częstości pulsu, respirometrii, elektrokardiografii holterowskiej, a także inne projekty związane z opieką w środowisku domowym.
    Źródło:
    Pomiary Automatyka Kontrola; 2006, R. 52, nr 10, 10; 79-82
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examples of computer-aided combined use of different methods of medical imaging
    Autorzy:
    Cysewska-Sobusiak, A.
    Hulewicz, A.
    Jukiewicz, M.
    Krawiecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/97331.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    computer-aided systems
    biomedical engineering
    methods of imaging
    stenting control
    Opis:
    This paper is devoted to interesting and difficult problems concerned with interdisciplinary biomedical engineering. The main purpose of the paper is to present rules and application of still developing modern methods of medical imaging combining properties of the selected techniques. The examples considered by the authors include combined applications of different methods of imaging such as: X-ray imaging, videoendoscopy, and ultrasonography. Some selected examples of effects obtained during real interventions assisted by combined imaging of operation site are shown in the paper. Examples of imaging the application of stents allowing for the performance of diagnostic and therapeutic procedures are also reported. Videoendoscopy imaging and X-ray imaging are two complementary methods applied during the interventions presented in stenting control. On the one hand, these methods facilitate a significant increase in diagnostics and treatment comfort. On the other hand, there is possibility to control stenting efficiency.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 511-520
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of diffusion coefficient and permeability through the barrier of substance in simulated biomedical systems
    Autorzy:
    Adach, A.
    Skassa, A.
    Bugalska, A.
    Kister, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/952660.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    drug release
    substance transfer
    diffusion chamber
    biomedical systems
    uwalnianie leku
    transfer substancji
    komora dyfuzyjna
    systemy biomedyczne
    Opis:
    The investigations deal with mass transfer in simulated biomedical systems. The modification of classical diffusion chamber, sequential unit (SU) system, imitated different biomedical setups, boundary conditions. The experiments simulated: diffusion chamber (also with two barriers), transport through the membrane to the blood stream, transport from the stent eluting drug simultaneously to the vessel cells and to the blood stream. The concentrations of substances and the relative mass increases/decreases for SU systems indicate that the order of the curves follows the order of mass transfer resistances. The strong dependence of mass transfer rates versus type of diffusing substance was confirmed. The calculated drug fluxes, diffusion coefficients, permeation coefficients are convergent with literature. Permeation coefficients for complex sequential systems can be estimated as parallel connexion of constituent coefficients. Experiments approved functionality of the SU for investigations in a simulated biomedical system. Obtained data were used for numerical verification.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 4; 543-554
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Miniaturized Wearable Fractal Patch Antenna for Body Area Network Applications
    Autorzy:
    Jain, Vikas
    Dhaliwal, Balwinder Singh
    Powiązania:
    https://bibliotekanauki.pl/articles/1844620.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wearable antenna
    conformal antenna
    biomedical systems
    body area networks
    fractal antenna
    Opis:
    This article presents the design of a miniaturized wearable patch antenna to be utilized for the body area network (BAN) applications. To reduce the size of the antenna a crown fractal geometry antenna design technique has been adopted, and which resulted in a size reduction of 26.85%. Further, the polyester cloth has been used as the substrate of the antenna to make the proposed antenna a flexible one, and suitable for wearable biomedical devices. The designed antenna functions for the 2.45 GHz ISM band and has the gain and bandwidth of 4.54 dB and 131 MHz respectively, covering the entire ISM band. The antenna characteristics like return loss (S11), directivity and radiation pattern have been simulated and analyzed. Specific absorption rate (SAR) and front to back ratio (FBR) of the proposed antenna at the human body tissue model (HBTM) in the planer and different bending conditions of the antenna have also simulated and analyzed, and the proposed antenna fulfils the desired design standards.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 2; 149-154
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected applications of it technologies supporting nursing and medical care
    Autorzy:
    Anus, Artur
    Adamska, Agata
    Kubas-Anus, Wiktoria
    Powiązania:
    https://bibliotekanauki.pl/articles/2197540.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska
    Tematy:
    nursing
    biomedical engineering
    medical systems
    Opis:
    This paper is a synthesis of the most important difficulties and obstacles affecting nursery in Poland, including the context of new challenges, such as the pandemic. With the use of information sourced from active healthcare personnel, this article is an attempt at diagnosing which possible fields could be led to optimization of medical personnel’s efforts and mitigation from certain tasks by the implementation of new IT technologies and devices. Application of the presented examples of solutions could be an answer to the issues addressed in this article.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2022, 26, 1; 38-47
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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