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Ultra-wideband (UWB) transceiver architecture is proposed in this paper for medical applications designed at the UWB frequency range. An analog to digital converter (ADC) circuit, which represents the key tool of signal processing for future developments of UWB systems, has been developed based on sampling theorem and pulse code modulation (PCM) techniques using UWB pulse generator with pico-second...
Artificial Neural Networks are explored as a statistical indicator of breast cancer. A simplified model of the breast and tumor is implemented and the scattered electromagnetic fields are used to train and test an Artificial Neural Network. The effects of wave polarization and tumor orientation are explored using a broadband dual-linear antenna.
A compact stair shaped DRA sensor is designed and fabricated for microwave breast cancer detection. A quarter wavelength choke was incorporated to minimize the finite ground plane. A 10 dB return loss of about 43% simulated bandwidth and 50% measured bandwidth are achieved with a 50 Ohms coaxial port. The design is performed numerically and confirmed experimentally. Simple model for the tissue is...
Computational methods have been utilized to simulate the growth behavior of a tumor originating near the mandible. Extension of the model to three-dimensions (3D) and adaptation to the case of breast cancer, specifically invasive ductal carcinoma, are discussed.
To improve Confocal Microwave Imaging (CMI) quality for breast cancer detection, data independent methods such as the delay-and-sum (DAS) and the microwave imaging via space-time (MIST) beamforming were used, and data dependent methods such as amplitude and phase estimation (APES), and robust capon beamforming (RCB) were used after data acquisition processing. Main drawback of data-dependant methods...
The solution of three dimensional inverse scattering problem using first-order Born and Rytov approximations are implemented for the reconstruction of an unknown dielectric sphere. Synthetic scattered field data from a sphere are generated using the Mie scattering method. The results show that the Rytov approximation provides better estimation of the sphere's parameters in comparison with the Born...
Deposition of silver nano-particles (Ag-nps) in a thin aluminum oxide layer resulting in an increased frequency dependent dielectric constant has been investigated for possible applications in nano-FLASH memory and nano-CMOS devices. The design of nano-FLASH memory with embedded Ag-nps in the gate oxide has been analyzed through simulation that demonstrates the charge storage capability of Ag-nps...
This paper reports on an integrated system of wirelessly linked radiation detectors. A small radiation detector is combined with a pulse counting circuit to record radiation pulses in the area of the detector. Multiple sensors are mesh networked together using wireless radios. Mesh networking allows for a large network of battery powered nodes with only one receiving hub. Radiation data is communicated...
It has been shown that fundamental electronic structures such as Diodes, and FET's can be constructed using selectively doped semiconducting carbon nanotubes or silicon nanowires (CNT's, SiNW's) at nanometer scale. Memory and Logic cores using these technologies have been proposed, that use the configurable junctions in two-dimensional crossbars of CNT's. These memories and logic arrays at this scale...
This paper reports on the design, growth, fabrication, and processing of an integrated Grating-Outcoupled Surface Emitting (GSE) semiconductor laser and a Double Heterojunction Bipolar Transistor (DHBT) driver. The GSE laser has a 380 ?? long gain section, 15 ??m long out-coupler, and 200 ??m long distributed Bragg reflectors (DBRs). The design of the DHBT includes an InP emitter and collector and...
A silicon p-n junction that is biased in avalanche breakdown mode emits visible light. Although the efficiency of such silicon emitters is poor, their ability to modulate at GHz frequencies make them a good choice for many applications including optical interconnects and optical contactless logic testing. Results demonstrate the feasibility of an all silicon optical interconnect system and an all...
Over the past two decades, infrared detection has become an important application. There have been many theoretical and experimental studies focused on the intersubband transitions in multiple quantum well systems. We report on the two??color multiple quantum well infrared photodetector. The reported detector consists of two stacks of InGaAs wells and AlGaAs barriers grown on semi??insulating GaAs...
This paper focuses on implementing an unsigned 24+8x8 quad-rail (i.e., accumulator consists of 12 quad-rail signals, while the multiplier and multiplicand are each 4 quad-rail signals) multiply and accumulate (MAC) unit using the asynchronous NULL convention logic (NCL) paradigm. The design utilizes the array-structured algorithm for partial product summation, and is implemented and simulated in VHDL,...
In this work, we use static and semi-static versions of NULL Convention Logic (NCL) primitives (i.e., threshold gates) to implement a dual-rail 8??8 2s complement multiplier using the Modified Booth2 algorithm for partial product generation and a Wallace tree for partial product summation. We establish the multiplier's functionality utilizing VHDL-based simulations of the gate-level structural design...
A wide range of emerging networking applications demand computer networks to provide quality of service (QoS). Packet switches play one of the most crucial roles in computer communication systems and traffic control in packet switches is the key to QoS provisioning. The combined input and cross-point queuing (CICQ) switch is a newly developed switch architecture that employs the crossbar-based switching...
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