Approximation of transformation media-based reshaping action by genetic optimization

2014-11-01
Ozgun, Ozlem
Kuzuoğlu, Mustafa
The reshaping technique that is based on transformation optics renders an object to be perceived as if it has a different shape irrespective of the location of the observer. This is achieved by coating the object with an anisotropic and spatially varying metamaterial layer by employing the concept of coordinate transformation. This paper presents a design approach for numerical approximation of reshaper medium by means of concentric layers coated over the object, each of which has simpler and easily realizable material parameters that are determined by the genetic optimization algorithm. The results of various finite element simulations are presented.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

Suggestions

Electromagnetic metamorphosis: Reshaping scatterers via conformal anisotropic metamaterial coatings
Ozgun, Ozlem; Kuzuoğlu, Mustafa (Wiley, 2007-10-01)
We introduce a new technique (in the context of time-harmonic electromagnetic scattering), which renders an object (or scaterer) to be perceived as if it has a different shape, irrespective of the location of the observer. This is achieved through the usage of an anisotropic metamaterial layer, which is designed as conformal to the surface of the scatterer by employing the concept of coordinate transformation. We report some numerical results for finite element simulations of two-dimensional anisotropic met...
Dual metrics and nongeneric supersymmetries for a class of Siklos space-times
Baleanu, D; Baskal, S (2002-10-20)
The presence of Killing-Yano tensors implies the existence of nongeneric supercharges in spinning point particle theories on curved backgrounds. Dual metrics axe defined through their associated nondegenerate Killing tensors of valence two. Siklos space-times, which are the only nontrivial Einstein spares conformal to nonflat pp-waves are investigated with regard to the existence of their corresponding Killing and Killing-Yano, tensors. It is found that a class of Siklos space-times admit dual metrics and n...
Investigation of the Effects of False Matches and Distribution of the Matched Keypoints on The PnP Algorithm
Demirtaş, Fatih; Gülmez, Baran; Yıldırım, İrem; Leloğlu, Uğur Murat; Yaman, Mustafa; Güneyi, Eylem Tuğçe (null; 2019-04-27)
Perspective-n-Point (PnP) problem is the estimation of the pose (location and orientation) of a calibrated camera from 3D-2D point correspondences, that is, three-dimensional coordinates of objects in a world coordinate system and corresponding pixels in two-dimensional images. PnP algorithms are used in computer vision, augmented reality, robotics, photogrammetry etc. Distribution of the points in the image and the accuracy of the 3D information are important on the accuracy of the estimated pose of the ca...
Implementation of nortfinding techniques
Oğuz, Pınar; Tuncer, Temel Engin; Department of Electrical and Electronics Engineering (2006)
The fundamental problem of navigation is to find the initial north angle of the body with respect to the reference frame. Determination of the north angle of the body frame is required in spacecraft, aircraft, sea-craft, land-craft and missile control and guidance. This thesis discusses implementation and comparison of four northfinding techniques. These are GPS (Global Positioning System) based with integer search, GPS based with Kalman filter, accelerometer based and IMU (Inertial Measurement Unit) based ...
Optimization of a Convex Rail Design for Electromagnetic Launchers
Polat, Hakan; Tosun, Nail; Ceylan, Doga; Keysan, Ozan (Institute of Electrical and Electronics Engineers (IEEE), 2020-06-01)
A rail geometry with a convex cross section instead of a rectangular one provides a higher contact area, uniform current density, and less transition on the contact surface, and it increases the performance in electromagnetic launchers. In addition, the design of convex rails should be considered together with armature structure, the distance between rails, rail length, and parasitic masses that all have an influence on the overall efficiency and armature/rail transition. A novel complete rail and launch pa...
Citation Formats
O. Ozgun and M. Kuzuoğlu, “Approximation of transformation media-based reshaping action by genetic optimization,” APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, pp. 597–604, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48358.