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In this paper, a composite medium based metamaterial with random distribution of nanoparticles in vacuum host to achieve negative effective refractive index in the visible wavelength range is suggested for invisibility purposes. Our calculations show that structures including single metal (dielectric) spheres and core-shell structures with metallic core and dielectric shell, which consists two-layer...
The detection of extremely small disturbances in mechanism of human body organs is a vital issue for the diagnosis of potential threats to human health. This paper is an attempt to present an application of fuzzy difference equations in predicting different qualities of a specific cardiovascular disturbance, such as, bigeminy. It is well-known that difference equations have been unable to predict...
Geometrical feature assessment of a cancerous tumor embedded in biological soft tissue is a necessity in follow-up procedure and making suitable therapeutic decisions. Evidently by having such features in hand, tumor resections will be more curative and beneficial. In this paper a procedure of examining boundaries of a sphere-shaped tumor embedded in the liver tissue was investigated. At first, the...
In this article by using the concept of generalized Hukuhara difference, the second-order fuzzy differential equation problem with constant coefficients is solved. Then the solution will be compared with each other in two cases. The first case is, when displacement is not performed. It means: the right side of second-order fuzzy differential equation is not transferred to the left side. The second...
In this paper we developed an automatic examiner robot for improving the process of cancer detection and tumor localization. Variation of mechanical stress on the surface of the tissue was selected as the indicative factor of tumor existence. The experimental examinations were performed on a lamb liver. A compression test was used to extract viscoelastic properties of tissue. Viscoelastic coefficients...
We consider the problem of controlling the yaw and lateral dynamics in heavy vehicles, consisting of combinations of a truck and multiple towed units. In such heavy vehicle configurations, undesired yaw rate and lateral acceleration amplifications, causing tail swings and lateral instabilities of the towed units, can be observed at high speed. In this paper, we present a predictive control approach...
This paper proposes a new approach to enlarge region of attraction (RA) of polynomial nonlinear systems using an optimization strategy. In this method, an input-output linearization approach is applied to the system. Then a generalized eigenvalue problem (GEVP) is formulated based on system constraints and the desired output performance. The solution to this GEVP leads to a controller which makes...
In this paper, we have modeled a steam boiler in mixed logic dynamical (MLD) framework which is one of the hybrid modeling structures. It is capable of modeling different types of systems like constrained hybrid systems, finite state machines and so on. Having found a proper model, we have controlled the plant using model predictive approach since this control strategy has been largely accepted in...
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