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    Wyświetlanie 1-8 z 8
    Tytuł:
    Adaptive biased-coin designs for clinical trials with several treatments
    Autorzy:
    Atkinson, Anthony
    Powiązania:
    https://bibliotekanauki.pl/articles/729740.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    c-optimal design
    limiting allocation proportion
    minimization
    randomization
    regularisation
    Opis:
    Adaptive designs are used in phase III clinical trials for skewing the allocation pattern towards the better treatments. We use optimum design theory to provide a skewed biased-coin procedure for sequential designs with continuous responses. The skewed designs are used to provide adaptive designs, the performance of which is studied numerically for designs with three treatments. Important properties are loss and the proportion of allocation to inferior treatments. Regularisation to provide consistent parameter estimates greatly improves both these properties.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2004, 24, 1; 85-108
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed finite element formulation and optimal design of thin composite laminates
    Autorzy:
    Cinquini, C.
    Mariani, C.
    Venini, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/206512.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    kompozyt
    composites
    mixed finite elements
    optimal design
    Opis:
    A Hellinger-Reissner variational principle is introduced to derive the weak form equation of thin generally orthotropic laminates. It leads naturally to a mixed finite-element approximation that has the out-of-plane deflection and the bending and twisting moments as independent unknowns. A triangular element is derived that is used for both analysis and optimization purposes. Numerical simulations on example laminates of irregular geometry are presented to validate the theoretical framework.
    Źródło:
    Control and Cybernetics; 1998, 27, 2; 165-176
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on the Optimal Design of Air Pockets in an Air Bearing Applied Tilting Index Table
    Autorzy:
    Lee, M.-J
    Lee, C.-M
    Powiązania:
    https://bibliotekanauki.pl/articles/971152.pdf
    Data publikacji:
    2009
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    optimal design
    tilting index table
    air bearing
    air pocket
    Opis:
    The tilting index table has attached to CNC machining center with 3axes, it can be improvement of its performance and its machining efficiency. The tilting index table is a key unit in order to manufacture some non-rotational and 3-dimensional parts, using the conventional machining center. The tilting index table is directly connected to a processing object. Regarding the increase in the deflection of the table, it directly affects processing objects and increases errors and that makes impossible to obtain desired processing precision. Thus, this study performed the shape optimization of air pockets in order to minimize the deflection presented in the existing table. In the numerical optimizing method for implementing optimal design, the general full factorial design and response surface method in the design of experiments were used. A finite element analysis was used for computational experiments in which the finite element analysis was performed by using the ANSYS Workbench, which is a type of commercial FEM tool. In addition, the analysis of the results was performed by using the commercial program, Minitab 15. The results show that the optimum design results is better than those of the initial design.
    Źródło:
    Journal of Machine Engineering; 2009, 9, 2; 114-123
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geometric Programming in the Design of Standard Laboratory for Students’ Practical Work
    Autorzy:
    Amuji, H. O.
    Olewuezi, N. P.
    Iwuji, J. C.
    Chijioke, I. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1046548.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Design height
    Design length
    Design width
    Geometric programming
    Optimal objective function
    Opis:
    In this paper, we applied Geometric programming in the design of a standard laboratory for students’ practical work in the Federal University of Technology Owerri. The laboratory has a capacity of 1,357 seats thereby containing 1357 students with the following dimensions: design length is 644.3m; design width is 337.8m and design height is 217.7m. The laboratory would cost the university authority a minimum of 915,875.2 naira to construct.
    Źródło:
    World Scientific News; 2019, 138, 2; 285-294
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design optimal rural road network using GIS
    Autorzy:
    Modinpuroju, A.
    Prasad, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/223559.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rural roads
    optimal road network
    minimum travel time
    facility index
    GIS
    drogi wiejskie
    optymalna sieć dróg
    minimalny czas podróży
    indeks obiektu
    Opis:
    To have an effective development among the isolated, remote areas, rural transportation is recognized as a key factor. Efficient rural transportation depends largely on a well-knit road network to provide accessibility and mobility in rural areas. This work affords an applied method for the development of rural road networks in rural areas of developing countries. The proposed methodology enables to determine nodal points in the rural road network based on the facility index of the settlements. The rural road network is generated by connecting the nodal points by minimum travel time path in Geographical Information System (GIS). Spatial analysis is carried out in the study area to identify the Desirable Coverage Distance of the Facility(DCDF). The Village Facility Index (VFI) is calculated by considering the desirable coverage distance. The suggested methodology is simple and practical, hence, highly applicable to real-world scenarios, as demonstrated in the definition of the road network for the rural areas.
    Źródło:
    Archives of Transport; 2017, 41, 1; 63-71
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opredelenie parametrov ehlementov stroitelnykh konstrukcijj c uchetom zadannojj verojatnosti ikh nerazrushenija
    Approach of the systems to design of build constructions
    Autorzy:
    Chemodurov, V.
    Popov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/77891.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    building condition
    nonlinear programming
    optimal decision
    design
    structural element
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 1
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal design of stationary flow problems by path-following interior-point methods
    Autorzy:
    Antil, H.
    Hoppe, R. H.
    Linsenmann, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/970290.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    shape optimization
    Stokes flow problems
    path-following interior-point methods
    Opis:
    We consider the numerical solution of structural optimization problems in CFD where the state variables are supposed to satisfy a linear or nonlinear Stokes system and the design variables are subject to bilateral pointwise constraints. Within a primal-dual setting, we suggest an all-at-once approach based on interior-point methods. The discretization is taken care of by Taylor-Hood elements with respect to a simplicial triangulation of the computational domain. The efficient numerical solution of the discretized problem relies on path-following techniques, namely a continuation method with an adaptive choice of the continuation step size, a long-step path-following algorithm and a nonlinear version of Mehrotra's algorithm. The performance of the suggested methods is documented by several illustrative numerical examples.
    Źródło:
    Control and Cybernetics; 2008, 37, 4; 771-796
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi Response Optimization of the Functional Properties of Rubber Seed – Shear Butter Based Core Oil Using D-Optimal Mixture Design
    Autorzy:
    Onyekwere, O. S.
    Odiakaose, C.
    Uyanga, K. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381034.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    core oil
    rubber seed oil
    shea butter
    aluminum casting
    rdzeń olejowy
    olej kauczukowy
    masło shea
    odlewanie aluminium
    Opis:
    In this study, rubber seed/shea butter oil was used to formulate core oil. The formulated core oil was characterised. D-optimal mixture design was used for multi response optimisation of the functional properties of rubber seed-shea butter coil oil. Desirable values for some responses might be obtained from a factor combination while for others responses not so desirable values. Through multiple response optimisations, a factor setting that gives the desirable values for all responses was obtained. The selected optimum mixture setting for the formulated core oil is 65.937% Rubber seed and 34.063% Shea butter oil at desirability of 0.924. Under the optimum condition the functional properties of the core oil was found to be 39.57KN/M2, 626.85KN/M2, 36.63KN/M2, 593.906KN/M2, 412.605 and 167.309s for Green Compressive Strength, Dry Compressive Strength, Green Tensile Strength, Dry Tensile Strength, Permeability and Collapsibility respectively. The optimum conditions were validated with less than 0.2% error. The functional properties of the formulated core oil was compared to the functional properties of linseed core oil. It was found that rubber seed-shea butter core oil can be used for producing cores suitable for Aluminium casting.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 207-223
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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