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Pulsed radar is an important technology used in both commercial and military aircraft. Learn how Software Defined Instrumentation utilizing Graphical Software Design and COTS PXI RF instrumentation can be configured to simulate and test different types of pulsed radar. This paper will cover fundamentals of pulse generation and analysis as well as advanced techniques such as the simulation of secondary...
An increasing number of MPI applications are being ported to take advantage of the compute power offered by GPUs. Data movement continues to be the major bottleneck on GPU clusters, more so when data is non-contiguous, which is common in scientific applications. The existing techniques of optimizing MPI data type processing, to improve performance of non-contiguous data movement, handle only certain...
In this paper we have proposed a novel MRAM based physically unclonable function (PUF) using the uncontrollable geometric variation in MRAM cells. The geometric variations generate a preferred ground state in every MRAM cell that we have used for the novel PUF. We have also analyzed the security properties of this PUF using a combination of simulation and fabrication methods. Results show an intra-distance...
The cortical surface is composed of a mosaic of distinct regions that are functionally or micro-anatomically homogeneous. Parcellating the cortical surface into few lobes is a common approach in neuroimaging resulting from a long tradition in physiology. However, defining such sub regions consistent across subjects is more difficult. If macro-anatomical landmarks such as central sulcus and parieto-occipital...
To produce an immersive 3D experience on multi-projector 3D display while avoiding pseudoscopic phenomenon, one of the key is how to acquire or generate source images set of projector array. Aiming at displaying characteristics of multi-projector 3D display, our study found that common rendering algorithm can be modified to suit for multi-projector 3D display condition, just need to modify the projection...
Shape context is a classic shape retrieval method with translation invariance, but it has not scalar or rotational invariance, which limits its application. A new shape feature descriptor-centroid distance ratio (CdR) is proposed and an improved shape retrieval algorithm based on CdR and shape context is brought forth. First, the contour points are sampled in order to reduce computation and then,...
A six-element compact array of wideband printed bowtie antennas is designed for mobile spectrum monitoring applications covering 2–6 GHz. Each element in the array is designed to cover a 60° azimuth sector with minimal beam-width variation over the frequency band. Simulated beam patterns and return loss performance is provided.
Beamforming is an integral part of modern wireless communication systems and a key component of beamforming is to have the ability to define specific nulls in the radiation pattern. Moreover, conformal antennas are being used in wireless systems to provide coverage in previously unavailable areas. This paper investigates the affects that a conformal surface may have on the specifically defined nulls...
Conformal antennas are being used more often in modern wireless communication systems. Because of this increased usage, novel self-adapting arrays have been developed for improving the performance of wireless communication systems that use conformal antennas on changing surfaces. Among the changing surfaces of interest is a cylinder with a varying radius and in this work, the properties of an autonomous...
A new technique for computing the location of each antenna element in a conformal array using general Bézier curves is presented here. More specifically, two cubic polynomial Bézier curves are used to compute the location of each antenna element in a conformal 1×4 phased-array antenna on a wedge- and cylindrical-shaped surface for various bend-angles and radius of curvature values, respectively. The...
This paper presents a reconfigurable antenna array that is made of four printed dipole elements. The change in the array operating frequency is achieved by feeding separately each array element via an external reconfigurable feeding network. The pattern diversity is achieved by incorporating a printed reflector between the array elements. A prototype antenna is fabricated and tested.
TM11 mode of circular patch antenna is commonly used for broadside applications. Higher order broadside modes are studied in this paper. Radiation pattern shaping of these modes has been attempted here to make them useful for various applications. The evolution of designs is inspired by the concept of metascreens. Significant sidelobe reduction is achieved in TM12 and TM13 modes which ultimately lead...
Fringe effects of electric field distribution near the FEA surface in diode configuration are studied by mathematical modelling. Different anode shapes are considered: plane anode and spherical anode. Modelling results of surface electric field distribution are presented. The spherical shape of anode allows higher voltage (and higher field emission current) without destructive arcs risk.
Because the section of aluminum alloy extrudate used in high-speed train is complex, lots of structural echoes and noise will be received when using array ultrasound to detect the flaws in friction stirring welds (FSW). Therefore, phased array acoustic field model and acoustic rays propagation model were introduced to simulate the acoustic field pressure distribution and the sound beams propagation...
A demonstration is made of the high-speed real-time image processing capabilities of the SCAMP-5 vision chip. The device provides a software-programmable 256×256 pixel-parallel SIMD processor array. In the example application, the IC can determine dimensions and the location of a single object, at a sustained rate of 100,000fps. At 30,000fps, the chip can return the same metrics from 5 objects. This...
This paper concerns the identifiability of antenna position errors in MIMO radar array shape self-calibration. Self-calibration is accomplished with the aid of far-field targets whose DOAs and scattering coefficients are initially unknown. By deriving and analyzing the hybrid Cramer-Rao bound (HCRB) of antenna position errors, we proved the following conclusion: with a position reference, for MIMO...
In reconfigurable computing, more tasks could be executed in parallel on the limited hardware resources by time multiplexing. Finding the available start time and appropriate placement position for arrival tasks is the key point of online reconfigurable scheduling. In this paper, we introduce an online scheduling algorithm with reconfigurable resource management. Vertex position tree — a new date...
The polymer dispensing technology used for a lens type LED package had been revealed in [1]. The ring type micro structure is adopted to confine the dispensed silicone encapsulant so as to form the packaged lens. To use the dispensing technology, the deviations in lens geometry are larger as comparing to that as using the silicone lens molding process. In this study herein, the dome-type UV LED and...
This paper reports an improved method for fabricating CMUT array using nickel electroplating over reflowed photoresist. Previously, a CMUT array using nickel on glass process which is used Doppler velocity sensor is reported [1]. The reported device use TI/Cu as sacrificial layer and nickel electroplating to form the membrane. In the newly reported CMUT, we use nickel electroplating over reflowed...
MATLAB is a dynamic numerical scripting language widely used by scientists, engineers and students. While MATLAB'S high-level syntax and dynamic types makes it ideal for prototyping, programmers often prefer using high-performance static languages such as FORTRAN for their final distributable code. Rather than requiring programmers to rewrite their code by hand, our solution is to provide a tool that...
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