65 research outputs found
Multiple-Purpose Subsonic Naval Aircraft (MPSNA): Multiple Application Propfan Study (MAPS)
Study requirements, assumptions and guidelines were identified regarding carrier suitability, aircraft missions, technology availability, and propulsion considerations. Conceptual designs were executed for two missions, a full multimission aircraft and a minimum mission aircraft using three different propulsion systems, the UnDucted Fan (UDF), the Propfan and an advanced Turbofan. Detailed aircraft optimization was completed on those configurations yielding gross weight performance and carrier spot factors. Propfan STOVL conceptual designs were exercised also to show the effects of STOVL on gross weight, spot factor and cost. An advanced technology research plan was generated to identify additional investigation opportunities from an airframe contractors standpoint. Life cycle cost analysis was accomplished yielding a comparison of the UDF and propfan configurations against each other as well as against a turbofan with equivalent state of the art turbo-machinery
Approximate controllability of impulsive neutral stochastic differentialequations with fractional Brownian motion in a Hilbert space
Late-onset bloodstream infections of Very-Low-Birth-Weight infants: data from the Polish Neonatology Surveillance Network in 2009–2011
Optimal control of a delayed HIV model
We propose a model for the human immunodeficiency virus type 1 (HIV-1) infection with intracellular delay and prove the local asymptotical stability of the equilibrium points. Then we introduce a control function representing the efficiency of reverse transcriptase inhibitors and consider the pharmacological delay associated to the control. Finally, we propose and analyze an optimal control problem with state and control delays. Through numerical simulations, extremal solutions are proposed for minimization of the virus concentration and treatment costs.publishe
Local Controllability of Models of Combined Anticancer Therapy with Delays in Control
We present sufficient conditions of local controllability for a class of models of treatment response to combined anticancer therapies which include delays in control strategies. The combined therapy is understood as combination of direct anticancer strategy e.g. chemotherapy and indirect modality (in this case antiangiogenic therapy). Controllability of the models in the form of semilinear second order dynamic systems with delays in control enables to answer the questions of realizability of different objectives of multimodal therapy in the presence of PK/PD effects. We compare results for the models without delays and conditions for relative local controllability of models with delays
Assignability of numerical characteristics of time-varying systems
The main aim of this article is to survey and discuss the existing state of art concerning the assignability by a feedback of numerical characteristics of linear continuous and discrete time-varying systems. Most of the results present necessary or sufficient conditions for different formulation of the Lyapunov spectrum assignability problem. These conditions are expressed in terms of various controllability types and optimalizability of the controlled systems and certain properties of the free system such as: regularity, diagonalizability, boundness away, integral separation and reducibility
Banach fixed-point theorem in semilinear controllability problems – a survey
The main aim of this article is to review the existing state of art concerning the complete controllability of semilinear dynamical systems. The study focus on obtaining the sufficient conditions for the complete controllability for various systems using the Banach fixedpoint theorem. We describe the results for stochastic semilinear functional integro-differential system, stochastic partial differential equations with finite delays, semilinear functional equations, a stochastic semilinear system, a impulsive stochastic integro-differential system, semilinear stochastic impulsive systems, an impulsive neutral functional evolution integro-differential system and a nonlinear stochastic neutral impulsive system. Finally, two examples are presented
Analiza różnych wariantów mechanizmu CHOKe
In the article we study a model of network transmissions with Active Queue
Management in an intermediate IP router. We use the OMNET++ discrete event simulator to model the
varies variants of the CHOKe algoithms. We model a system where CHOKe, xCHOKe and gCHOKe are
the AQM policy. The obtained results shows the behaviour of these algorithms. The paper presents also
the implementation of AQM mechanisms in the router based on Linux.W artykule został przedstawiony model sieciowej transmisji danych poprzez
router z zaimplementowanymi mechanizmami Aktywnego Zarządzania Kolejką
(AQM). Badania zachowania mechanizmów AQM zostały przeprowadzone przy użyciu
symulatora zdarzeń dyskretnych OMNET++. Uzyskane wyniki zostały zweryfikowane w środowisku rzeczywistym. W oparciu o system operacyjny Linux stworzono
programowy router implementujący mechanizmy wcześniej przebadane w środowisku
symulacyjnym. Przeprowadzono analizę zachowania algorytmów AQM z rodziny
CHOKe (CHOKe, xCHOKe, gCHOKe). W badaniach rozważano problem wpływu
tych mechanizmów na tzw. agresywne (potrzebujące większego pasma) źródła transmisji
danych
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