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We present a maneuverable antenna array that adapts to the interfering environment of the wireless base station. It delivers best estimates of the directions of the system users, an information of the utmost importance to the so-called smart base stations. Closed-form expressions are provided that determine the shape of the optimum antenna array. In the worst case scenario, when the system user may...
In this paper, we introduce an efficient method to control the propagation stopping condition locally for asynchronous binary propagation networks. Additional switches are introduced to the Wired-OR pull-down path branches, where the switches are controlled by the PE outputs from the neighborhood. An example for a 1-D case for object center pixel extraction is given with simulation results for asymmetric...
Mean-variance mapping optimization (MVMO) is an emerging evolutionary algorithm, which adopts a single-solution based approach and performs evolutionary operations within a normalized range of the search for all optimization variables. MVMO uses a special mapping function for mutation operation, which allows a controlled shift from exploration priority at early stages of the search process to exploitation...
Vertical arrays provide the most convenient geometry for many underwater passive acoustic applications that require the identification and isolating of propagating normal modes. Unfortunately, practical deployments of vertical arrays face several practical issues, including the need to compensate for vertical array inclination, and incomplete coverage of the water column that makes the use of Sturm-Liouville...
The paper discusses signal processing and mechatronics solutions for tactile object recognition using robotic hands. The two important aspects analyzed are the recognition of objects from tactile displacement profiles obtained by force sensing transducers and the recognition of textures using a rubbing motion executed by a robotic finger equipped with a dynamic tactile fingertip. Neural network solutions...
Buried object localization in presence of sensor phase errors is presented in this study. Phase errors are introduced by the moving of the sensor array from their original positions during the experiment which gives an erroneous object localization. To solve the problem, an objective function is defined using the exact solution of the scattered acoustic field in the MUSIC method. The DIRECT algorithm...
Space-filling curves have intrigued both artists and mathematicians for a long time. They bridge the gap between aesthetic forms and mathemtical geometry. To enable construction by computer, an efficient recursive algorithm for the generation of space-filling curves is given. The algorithm is elegant, short and considerably easier to implement than previous recursive and non-recursive algorithms,...
Array self calibration consists of identifying array shape distortions and deviations to gain and phase sensor responses, in an unknown source field. Conditions of local identifiability of these parameters are established, and turn out to depend on the type of array and the type of field. The minimal number of sources and sensors is calculated in each case, and the nature of the remaining degrees...
Signal decimation aimed at optimal spectral packing has a variety of applications in areas ranging from array processing to image processing. In this article we propose and discuss a new method for determining decimation grid and prefilter that best fit the spectral extension of any 2D signal defined on an arbitrary sampling lattice. The method has been implemented and tested on digital images in...
Microfluidic-based biochips are replacing the conventional biochemical analyzers, and are able to integrate onchip all the necessary functions for biochemical analysis using microfluidics. The digital microfluidic biochips are based on the manipulation of liquids not as a continuous flow, but as discrete droplets on an array of electrodes. Microfluidic operations, such as transport, mixing, split,...
An intrinsic issue of large-array beamforming and signal processing in random-inhomogeneous environments is known to be considerable degradation of signal coherence in space domain. Such a scenario arises in many applications, and array operations in underwater sound channels with emphasis on long-range sound propagation is one of the most typical cases. Another key issue is here the multimode propagation...
The Square Kilometre Array (SKA) will form the largest radio telescope ever built and such a huge instrument in the desert poses enormous engineering and logistic challenges. Algorithmic and architectural breakthroughs are needed.
A new high-frequency structure for the terahertz amplifier is presented. The structure combined the properties of the grating and sub-wavelength holes array. We focused on discussing the influence of sub-wavelength hole shape, grating shape and the structure parameters on dispersion characteristics, coupling impedance, and the distribution of the electric field. Compared with the traditional rectangular...
This paper emphasizes on the emergence of Metamaterials in the field of antenna designing. For enhancing the performance of the antenna in terms of various parameters viz. gain, directivity, main lobe and side lobe levels, bandwidth; metamaterials are used as an uniform flat lens along with the antenna. A novel 'U' shape slotted patch antenna & its array of 2fi2 is designed for 2.4 GHz frequency...
Two different radiating mechanisms are implemented using the ridge gap waveguide (RGW) technology for the design of a frequency scanning antenna with high gain; through a number of radiating slots array. A Quasi-TEM horn of a shaped ridge is designed as a guiding structure to direct the propagating waves in the enclosed air gap between the ridge and the top radiating metallic plate. The first well...
In this paper, the results of a study on the optimal footpad design for vertical climbing on acrylic surface with various curvatures used Taguchi method is presented. For a climbing robot, the adhesion system plays an important role in the climbing process. Only an appropriate adhesion strength will prevent the robot from falling and allow it to climb normally. Therefore, the footpad is a significant...
This paper presents an object shape estimation algorithm using a sparse IR sensor array which is installed in a wheeled array system. The system is in a modular shape and each module consists of three omni wheels and an IR sensor in a triangular configuration. A flat object with unknown shape is placed on top of the wheeled array and it is transported in a certain way that the sparse sensor array...
Retinal prostheses have successfully proven to be a viable treatment for advanced stages of retinal degenerative diseases such as retinitis pigmetosa. However, current implementations have critical limitations that affect their functionality and resolution. This paper reviews design challenges of the electronics considering the biology of the eye and discusses new approaches for future high-density...
Interest for Wireless Power Transmission systems (WPTs) is increasing since they allow for power supplied devices involving low power consumption, located in unreachable area or needing expensive maintenance costs. In this paper we will present a rectenna design which is modeled and evaluated for an WPTs at 2.45GHz. The proposed rectenna structure consists of a 3×3 receiving antenna array with circular...
This paper presents a chip containing a flexible scaffold which facilitates the construction of tissues with different shapes. The chip, entirely made of Polydimethylsiloxane (PDMS), has 2 main components including actuator and channel layers. The actuator layer consists of a 6×6 array of membrane actuators, with round shapes. The channel layer has a single layered structure due to the simplicity...
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