In several critical military missions, more than one decision level are involved. These decision levels are often independent and distributed, and sensitive pieces of information making up the military mission must be...
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In this study, a new approach is proposed to determine controller parameter spaces that achieve integrity for multivariable systems. Integrity refers to the property that the closed-loop system remains stable against ...
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As a special type of object detection, pedestrian detection in generic scenes has made a significant progress trained with large amounts of labeled training data manually. While the models trained with generic dataset...
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Many Parameter Space Approach (PSA) based methods have been proposed previously to determine the stabilizing controller parameter spaces for discrete-time systems. The PSA approach is based on sweeping over the whole ...
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Many Parameter Space Approach (PSA) based methods have been proposed previously to determine the stabilizing controller parameter spaces for discrete-time systems. The PSA approach is based on sweeping over the whole range of singular frequencies which leads to an expensive numerical computation to find the boundaries of the stability region. These PSA based methods were used for obtaining the stability boundaries for parameter uncertain discrete-time systems as well. However, this results in extremely high computational complexity in addition to other drawbacks. In this study, an approach to determine the stabilizing controller parameter regions of linear discrete-time systems with uncertain parameters is proposed. This novel procedure makes use of the Strong Kharitonov theorem for getting over the high computational complexity resulted due to the uncertainty of the system. Moreover, the asserted approach utilizes a novel Lyapunov based mapping technique for avoiding the drawbacks accompanied with the previously presented PSA based methods in literature. Two different case studies are included in the paper to illustrate the advantages and effectiveness of the proposed method.
In this study, a new approach is proposed to determine controller parameter spaces that achieve integrity for multivariable systems. Integrity refers to the property that the closed-loop system remains stable against ...
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In this study, a new approach is proposed to determine controller parameter spaces that achieve integrity for multivariable systems. Integrity refers to the property that the closed-loop system remains stable against arbitrary failures of certain subsystems in order to increase the reliability of industrial systems. The proposed approach is based on the Lyapunov equation stability mapping technique. Instead of solving 2n equations to determine the boundaries of the stabilizing regions that is required in the standard Lyapunov approach, it is necessary and sufficient to solve at most two equations with respect to the controller parameters in the proposed approach. Using this approach, an algorithm is asserted to determine non-conservative controller gain regions that guarantee the stability of the multivariable systems when any one of the controller parameters fails to operate. Lastly, two benchmark case studies are included within the scope of this study to verify the effectiveness and correctness of the derived theoretical results.
In a three-distribution-function framework, a lattice Boltzmann model was proposed for thermal flows through porous media under local thermal non-equilibrium conditions, in which both viscous dissipation and compressi...
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In a three-distribution-function framework, a lattice Boltzmann model was proposed for thermal flows through porous media under local thermal non-equilibrium conditions, in which both viscous dissipation and compression work were considered. In this model, a density distribution function was used to simulate the flow field and two total energy distribution functions were employed to simulate temperature fields for both fluid and solid. Discrete equilibrium density and total energy distribution functions were obtained from Hermite expansions of the corresponding moment equations. Through Chapman-Enskog procedure, macroscopic governing equations could be recovered expediently from the present thermal lattice Boltzmann model. The proposed model was validated by numerical simulations of thermal Poiseuille flow in a planar porous channel and natural convection in a square porous cavity.
In this study, a two phase heuristic bubble approach is presented for the solution of Location-Routing Problems (LRP), which has two subsections called Location Allocation Problem (LAP) and Vehicle Routing Problem (VR...
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In this study, a two phase heuristic bubble approach is presented for the solution of Location-Routing Problems (LRP), which has two subsections called Location Allocation Problem (LAP) and Vehicle Routing Problem (VRP). The proposed two phase heuristic bubble approach is designed to solve these two problems separately. A new heuristic approach is a combination of Heuristic Bubble Polygon (HBP) that is proposed for LAP and Heuristic Bubble Algorithm (HBA) that is proposed for the solution to VRP. The benefit of the proposed two phase heuristic bubble approach are studied via simulations and the obtained results are compared with Jokar method and Sahraeian methods.
Wireless Sensor Networks (WSNs) when combined with various energy harvesting solutions managing to prolong the overall lifetime of the system and enhanced capabilities of the communication protocols used by modern sen...
Wireless Sensor Networks (WSNs) when combined with various energy harvesting solutions managing to prolong the overall lifetime of the system and enhanced capabilities of the communication protocols used by modern sensor nodes are efficiently used in are efficiently used in Smart Grid (SG), an evolutionary system for the modernization of existing power grids. However, wireless communication technology brings various types of security threats. In this study, firstly the use of WSNs for SG applications is presented. Second, the security related issues and challenges as well as the security threats are presented. In addition, proposed security mechanisms for WSN-based SG applications are discussed. Finally, an easy- to-implement and simple attack detection framework to prevent attacks directed to sink and gateway nodes with web interfaces is proposed and its efficiency is proved using a case study.
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