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Plasma enhanced chemical vapor deposition was used to deposit hydrogenated silicon nitride (SiNx:H) thin films using two gas mixtures: SiH4/NH3 AND SiH4/N2. NH3 and N2 gas flowrates were the only deposition parameters varied. Surface morphology of all the samples was observed with the help of atomic force microscopy (AFM). Fourier transform infrared spectroscopy (FTIR) was utilized to examine the...
In this paper, we present an intelligent approach to analysing prostrate ultrasound images in order to diagnose prostate cancer. Algorithms based on fuzzy image processing are applied first to enhance the contrast of the original image, to extract the region of interest and to enhance the edges surrounding that region. Then, we extract features characterising the underlying texture of the regions...
In recent years many authors largely given attention to the effect of active loading index for low voltage distribution system. But this paper presents a novel approach for determining the reactive loading index of a low voltage distribution system at the proximity of voltage collapse point. The proposed procedure of maximum permissible load bus voltage of a power system within reactive loading index...
In this paper an optimized architecture of bit plane coder for Embedded Block Coding with Optimal Truncation (EBCOT) algorithm targeting its FPGA implementation is proposed. Although several speed up techniques exist, we present architecture whose performance is improved based on detailed analysis of data path used to obtain context windows. Multiplexer based coding style is adapted to utilize the...
Skew-corrected document images are necessary for subsequent downstream operations such as archiving, printing or improving OCR performance. Image rotation is a necessary and more expensive step in achieving skew correction of document images. Other applications of rotation include, image registration and orientation correction. Traditional image rotation algorithms [2-4] such as three-shear rotation...
This paper presents an analog to digital converter (ADC) capable of resolving 8 bits at a sampling rate of 250 MSPS. Primary objective of the design has been to make a trade-off between power consumption and resolution while keeping the sampling rate high. The parallel-pipeline architecture was best fit for such requirements. A new sub-ADC scheme has been introduced here to remove possible switch...
Nuclear resonance fluorescence is of particular interest to the detection of special nuclear material (SNM) where isotopic characterization is paramount. In addition to photons emitted by resonance de-excitation, there will also be a significant amount of backscattered photons that will distort the NRF signal. The backscattered spectra must be characterized in order to design a detection system that...
HiPER and ELI are two pan-European projects to establish large-scale laser research facilities. HiPER is dedicated to laser fusion energy research, ELI focuses the exploitation of ultra-short and ultra-intense laser pulses. Both systems will require DPSSL systems delivering ns pulses of kJ-scale energy at multi-Hz repetition rates.
The Diocles laser at the University of Nebraska presents the possibility of producing a tunable, monochromatic X-ray source that has obvious applications in nuclear material detection. The pulsed and directional nature of this X-ray source makes traditional spectroscopy techniques for characterizing this source challenging. The large number of X-rays arriving at the detector in a short period of time...
The last few years have seen considerable interest in the wireless networking research community in analyzing the connectivity of wireless ad-hoc networks formed by a set of nodes distributed in a two dimensional plane (deployment area) with a (i) uniform probability density function and (ii) uniform transmission range. Although several important and interesting results are known in this domain, most...
This paper investigates the impact of limited feedback on user throughput in the uplink of a cellular system. We consider scenarios where the base-station has limited feedback resources, which it needs to allocate across the users it serves. We propose a general model that captures the effect of feedback allocation on the achievable rates for a user, which allows us to characterize the rate region...
Cellular neural network (CNN) algorithms have been successfully used in a plethora of image processing applications including the medical imaging domain. Analogic CNN algorithms use CNN templates combined with logic operations to perform operations such as blurring and thresholding for image processing. In this paper we apply CNN based techniques incorporating image enhancement, region segmentation...
Ultrasound imaging systems use a scan conversion process to display data acquired with polar coordinate in Cartesian coordinate system. To avoid artifacts interpolation is needed for unsampled pixels. The resultant image quality is dependent on the interpolation algorithm. Majority of the interpolation mechanisms enhance both smooth and detailed regions which degrades the image quality. In this paper,...
Digital signal processing (DSP) algorithms are mostly implemented on special purpose digital signal processors. Recently, advanced hybrid microcontrollers and field programmable gate arrays (FPGAs) are also evolving as the suitable platforms for realizing DSP algorithms. This paper aims towards the analysis of performance of popular DSP algorithms on advanced microcontroller and FPGAs. A time complexity...
There is a growing need to support real-time applications over the Internet. Real-time interactive applications often have multiple quality-of-service (QoS) requirements which are application specific. Traditional provisioning of QoS in the Internet through IP routing - Intserv or Diffserv - faces many technical challenges, and is also deterred by the huge deployment issues. As an alternative, application...
Targetless logic emulation refers to a verification system in which there are no external hardware targets interfacing with the emulator. In such systems input stimuli to the DUT come either from a user provided vector file or a HDL testbench running on a software simulator and the DUT runs on hardware based logic emulator. Many users use such targetless environment for automated long running verification...
The optical reach (the distance an optical signal can travel before the signal quality degrades to a level that necessitates regeneration) ranges from 500 to 2000 miles. To establish a lightpath of length greater than the optical reach, it is necessary to regenerate optical signals. In a translucent optical network, there are regeneration points, where the signal undergoes Optical-Electronic-Optical...
The increasing density of WiFi access points (APs) in metropolitan areas is enabling an opportunistic model of wireless networking, whereby a "guest" user within range of one or more wireless APs can gain temporary Internet access through these APs. In this paper, we address the problem of TCP throughput prediction for opportunistic networks. Applications of opportunistic networking can...
The studies in fault-tolerance in networks mostly focus on the connectivity of the graph as the metric of fault-tolerance. If the underlying graph is k-connected, it can tolerate up to k - 1 failures. In measuring the fault tolerance in terms of connectivity, no assumption regarding the locations of the faulty nodes are made - the failed nodes may be close to each other or far from each other. In...
This paper presents the concept of a voltage controlled pulse skipping modulation (VCPSM) in a dc-dc converter, which improves the efficiency, ripple magnitude, and transient response over a wide range of light load condition. The duty ratio of VCPSM, instead of remaining constant as in a classical PSM, is controlled using the voltage mode control with an additional input voltage feed-forward along...
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