arXiv subjects

David Noel

Publications and source records attributed to David Noel.

4 recordsLinked to original sources

arXiv2023

Defect Localization in Flip-Chip Devices Using Space-Domain Reflectometry and Magnetic Current Imaging

Magnetic Field Imaging (MFI) is the newest Fault Isolation/Failure analysis technique to non-destructively and non-invasively localize defects such as electrical shorts and opens in both the die and package levels of Flip-Chips. This is accomplished using Magnetic Current Imaging (MCI) and Space-Domain Reflectometry (SDR) techniques accompanied using a Giant Magneto-Resistor (GMR), which provides detailed spatial optical images at sub-micron resolutions to localize further and identify defects [1]. This paper will demonstrate the use of MCI to locate electrical shorts by imaging the magnetic fields induced by the current-carrying wire bonds using a Superconducting Quantum Interference Device (SQUID) [2], then implement SDR to locate electrical opens using SQUID and GMR to produce detailed optical images of the defect locations. The exact location of the defect can then be localized by using a CAD overlay of the circuit schematic with the optical and MCI images.

physics.app-ph↗

arXiv2023

Parallel Data Compression Techniques

With endless amounts of data and very limited bandwidth, fast data compression is one solution for the growing datasharing problem. Compression helps lower transfer times and save memory, but if the compression takes too long, this no longer seems viable. Multi-core processors enable parallel data compression; however, parallelizing the algorithms is anything but straightforward since compression is inherently serial. This paper explores techniques to parallelize three compression schemes: Huffman coding, LZSS, and MP3 coding

cs.DC↗

arXiv2023

Stock Price Prediction using Dynamic Neural Networks

This paper will analyze and implement a time series dynamic neural network to predict daily closing stock prices. Neural networks possess unsurpassed abilities in identifying underlying patterns in chaotic, non-linear, and seemingly random data, thus providing a mechanism to predict stock price movements much more precisely than many current techniques. Contemporary methods for stock analysis, including fundamental, technical, and regression techniques, are conversed and paralleled with the performance of neural networks. Also, the Efficient Market Hypothesis (EMH) is presented and contrasted with Chaos theory using neural networks. This paper will refute the EMH and support Chaos theory. Finally, recommendations for using neural networks in stock price prediction will be presented.

q-fin.ST↗

arXiv2023

Wireless Data Link at 1Gbps using 256 QAM

This report describes the design and proposal of a wireless link capable of broadcasting at 1 Gbps. For this application, isotropic antennas, 256 QAM modulation, and BER level less than 1e-5, without using error correction coding, were implemented. A frequency of 5GHz was employed to achieve such high data rates. For unlicensed operations in this frequency range, the FCC allocates a 5.15 - 5.35 GHz frequency range with maximum acceptable power levels no greater than 250mW(~24dBm)[2]. Due to its inexpensiveness and simplicity, the transceiver architecture and all its subsystems used the homodyne system. The complete system architecture is described with some of their most significant performance characteristics, including modulation, fundamental and 3rd harmonics, power spectra, and constellation diagrams. To conclude, a Bill of Materials (BOM), costs, and associated specifications were included.

eess.SP↗