Dtime: Discrete Topological Imaging For Multipath Environments, 2010 University of Pennsylvania
Dtime: Discrete Topological Imaging For Multipath Environments, Robert Ghrist, H. Owen, Michael Robinson
Technical Reports (ESE)
This report is presented to summarize work completed under a DARPA seedling project for the imaging of urban environments, using radio multipath measurements and topology extraction algorithms. This report provides an overview of the mathematical theory behind the work, as well as a description of the simulation and results that accompanies the theory.
Scan Loss Pattern Synthesis For Adaptive Array Ground Stations, 2010 Embry-Riddle Aeronautical University
Scan Loss Pattern Synthesis For Adaptive Array Ground Stations, William C. Barott, Mary Ann Ingram, Paul G. Steffes
We present several techniques for maximizing the contact time between low Earth orbiting satellites (LEOs) and a ground station (GS). The GS comprises an adaptive array of electronically steered space-fed lenses (SFLs). Each SFL is manufactured as a low-cost printed circuit with the result that it exhibits scanning loss. By differently orienting the boresights of the SFLs in the adaptive array, the SFL's scanning losses can be made to optimally complement the path loss of the LEO, thereby reducing the cost of the GS while maximizing the download capacity of the satellite link. The optimization, implemented with a genetic ...
Intelligibility Of Electrolarynx Speech Using A Novel Actuator, 2010 Dublin Institute of Technology
Intelligibility Of Electrolarynx Speech Using A Novel Actuator, Brian Madden, Mark Nolan, Ted Burke, James Condron, Eugene Coyle
During voiced speech, the larynx provides quasi-periodic acoustic excitation of the vocal tract. Following a laryngectomy, some people speak using an electrolarynx which replaces the excitatory function of the absent larynx. Drawbacks of conventional electrolarynx designs include the buzzing monotonic sound emitted, the need for a free hand to operate the device, and difficulty experienced by many laryngectomees in adapting to its use. Despite these shortcomings, it remains the preferred method of speech rehabilitation for a substantial minority of laryngectomees. In most electrolarynxes, mechanical vibrations are produced by a linear electromechanical actuator, the armature of which percusses against a metal ...
Ultrasonic Shark-Tag Locator System For Iver2 Auv, 2010 California Polytechnic State University - San Luis Obispo
Ultrasonic Shark-Tag Locator System For Iver2 Auv, Nathaniel Garcia
The purpose of this project is to develop a system for tracking an ultrasonic underwater transmitter that can be integrated into an IVER2 AUV to allow it to follow and monitor tagged sharks in the ocean for scientific research.
The system consists of a four main components including a shark-tag, two hydrophones, a filter/amplifier & threshold detector circuit, and a microcontroller.
This project, while not completing field testing and integration with the IVER2, is a proof of concept of a system that utilizes passive sonar to determine a bearing from the system to a shark-tag transmitter. Additionally, it devised several ...
Information Hiding Using Stochastic Diffusion For The Covert Transmission Of Encrypted Images, 2010 Dublin Institute of Technology
Information Hiding Using Stochastic Diffusion For The Covert Transmission Of Encrypted Images, Jonathan Blackledge
A principal weakness of all encryption systems is that the output data can be `seen' to be encrypted. In other words, encrypted data provides a 'flag' on the potential value of the information that has been encrypted. In this paper, we provide a novel approach to `hiding' encrypted data in a digital image. We consider an approach in which a plaintext image is encrypted with a cipher using the processes of `stochastic diffusion' and the output quantized into a 1-bit array generating a binary image cipher-text. This output is then `embedded' in a host image which is undertaken either in ...
Simple Ofdm, 2010 Indiana University - Purdue University Fort Wayne
Simple Ofdm, Andrew Marcum, Todor Cooklev, C. Pomalaza-Ráez
Engineering Faculty Publications
There is a significant demand for a decreasein the size, weight and power (SWaP) associated withwireless systems. In this research, a low-complexityMIMO OFDM system is advanced. The proposedsystem is essentially multiplierless and thus requiresmuch simpler digital hardware to be implemented. As aresult, the chip area associated with the MIMO OFDMsystem can be significantly reduced. The reduction incomplexity is obtained via modification to the FastFourier Transform (FFT) and Inverse Fast FourierTransform (IFFT) algorithms necessary to implementOFDM multi-carrier modulation. Computationalcomplexity is reduced by quantizing what are known asthe “twiddle factors” in traditional FFT algorithms suchas the Radix-4. The quantization allows for allmultiplications ...
Variance-Component Based Sparse Signal Reconstruction And Model Selection, 2010 Iowa State University
Variance-Component Based Sparse Signal Reconstruction And Model Selection, Kun Qiu, Aleksandar Dogandžić
Electrical and Computer Engineering Publications
We propose a variance-component probabilistic model for sparse signal reconstruction and model selection. The measurements follow an underdetermined linear model, where the unknown regression vector (signal) is sparse or approximately sparse and noise covariance matrix is known up to a constant. The signal is composed of two disjoint parts: a part with significant signal elements and the complementary part with insignificant signal elements that have zero or small values. We assign distinct variance components to the candidates for the significant signal elements and a single variance component to the rest of the signal; consequently, the dimension of our model's ...
Touch Screen Sound Controller, 2010 California Polytechnic State University - San Luis Obispo
Touch Screen Sound Controller, James Fenley, Jonathan Law
The Touch Screen Sound Controller sets out to explore the use of a touch screen as a sound control interface for the disk jockey profession. In addition, the project aims to provide an alternate means of transferring audio data by way of TCP/IP communications as opposed to MIDI. By applying our method, a user may stream pulse-code modulated data from a server onto a client’s RAM via an Ethernet connection. A 32bit, 200MHz ARM9 microprocessor addresses data from the RAM and proceeds with executing DSP instructions from the user. The connection between the touch screen and the central ...
Ultrasonic Listener: Microcontroller Based Frequency Shifter, 2010 California Polytechnic State University - San Luis Obispo
Ultrasonic Listener: Microcontroller Based Frequency Shifter, Troy Fredriks
No abstract provided.
Mixing Digital And Analog Audio Signals, 2010 California Polytechnic State University - San Luis Obispo
Mixing Digital And Analog Audio Signals, David Robison
I have been playing the drums for thirteen years. I started out on an electric drum set and then progressed to an acoustic set. I have always wondered what it would sound like to combine the two types of sounds and this senior project dissected that interest to its raw form. Delving into the problems and solutions of combining digital and analog audio signals intrigued me and thus, became my senior project. The design process included research into the analog and digital realms, computer simulations, and actual implementation successes and failures.
The signal path begins at the bass drum where ...
Ecg Based Personal Identification Using Extended Kalman Filter, 2010 Center for Biomedical Engineering, Universiti Teknologi Malaysia
Ecg Based Personal Identification Using Extended Kalman Filter, Chee-Ming Ting Phd, Sh-Hussain Salleh
Chee-Ming Ting PhD
This paper proposes a new approach for electrocardiogram (ECG) based personal identification based on extended Kalman filtering (EKF) framework. The framework uses nonlinear ECG dynamic models formulated to represent noisy ECG signal. The advantage of the models is the ability to capture distinct ECG features used for biometric recognition such as temporal and amplitude distances between PQRST points. Moreover the inherent modeling of additive noise provides robust recognition. Log-likelihood scoring is proposed for classification. The algorithm is evaluated on identification task on 13 subjects of MIT-BIH Arrhythmia Database using single lead data. Identification rate of 87.50% is achieved on ...
An Adaptive Nonparametric Modeling Technique For Expanded Condition Monitoring Of Processes, 2010 University of Tennessee - Knoxville
An Adaptive Nonparametric Modeling Technique For Expanded Condition Monitoring Of Processes, Matthew John Humberstone
New reactor designs and the license extensions of the current reactors has created new condition monitoring challenges. A major challenge is the creation of a data-based model for a reactor that has never been built or operated and has no historical data. This is the motivation behind the creation of a hybrid modeling technique based on first principle models that adapts to include operating reactor data as it becomes available.
An Adaptive Non-Parametric Model (ANPM) was developed for adaptive monitoring of small to medium size reactors (SMR) but would be applicable to all designs. Ideally, an adaptive model should have ...
An Effective Approach To Nonparametric Quickest Detection And Its Decentralized Realization, 2010 University of Tennessee - Knoxville
An Effective Approach To Nonparametric Quickest Detection And Its Decentralized Realization, Dayu Yang
This dissertation focuses on the study of nonparametric quickest detection and its decentralized implementation in a distributed environment. Quickest detection schemes are geared toward detecting a change in the state of a data stream or a real-time process. Classical quickest detection schemes invariably assume knowledge of the pre-change and post-change distributions that may not be available in many applications. A distribution free nonparametric quickest detection procedure is presented based on a novel distance measure, referred to as the Q-Q distance calculated from the Quantile-Quantile plot. Theoretical analysis of the distance measure and detection procedure is presented to justify the proposed ...
Determination Of Material Emission Signatures By Ptr-Ms And Their Correlations With Odor Assessments By Human Subjects, 2010 BEESL Lab., Syracuse University
Determination Of Material Emission Signatures By Ptr-Ms And Their Correlations With Odor Assessments By Human Subjects, Kwanghoon Han
The objectives of this study were to determine volatile organic compound (VOC) emission signatures of nine typical building materials by using proton transfer reaction-mass spectrometry (PTR-MS) and to explore the correlation between the PTR-MS measurements and the measurements of acceptability by human subjects. VOC emissions from each material were measured in a 50-l small-scale chamber. Chamber air was sampled by PTR-MS to determine emission signatures. Sorbent tube sampling and TD-GC/MS analysis were also performed to identify the major VOCs emitted and to compare the resulting data with the PTR-MS emission signatures. The data on the acceptability of air quality ...
Space-Time Adaptive Processing With Multi-Staged Wiener Filter And Principal Component Signal Dependent Algorithms, 2010 California Polytechnic State University - San Luis Obispo
Space-Time Adaptive Processing With Multi-Staged Wiener Filter And Principal Component Signal Dependent Algorithms, Zheng N. Zhou
Master's Theses and Project Reports
Space-time Adaptive Processing (STAP) is a two-dimensional filtering technique for antenna array with multiple spatial channels. The name "space-time" describes the coupling of these spatial channels with pulse-Doppler waveforms. Applications for STAP includes ground moving target indicator (GMTI) for airborne radar systems.
Today, there are strong interests to develop STAP algorithms for operations in “sample starved” environments, where intense environmental interference can reduce STAP capacity to detect and track ground targets. Careful applications of STAP can effectively overcome these conditions by suppressing these interferences and maximize the signal to interference plus noise ratio (SINR). The Multi-stage Wiener filter (MWF) and ...
A Novel Eight Switches Inverter Topology For Plug-In Hybrid Electric Vehicle, 2010 Vrije Universiteit Brussel (VUB), Belgium
A Novel Eight Switches Inverter Topology For Plug-In Hybrid Electric Vehicle, Omar Hegazy, Joeri Van Mierlo
Dr. Eng. Omar Hegazy
In this paper, a novel inverter topology, Eight Switches Inverter (ESI), is proposed for HEV, especially PHEV system to reduce the number of switches, and to achieve high performance during discharging mode, braking mode and charging mode from grid. Thereby, this topology gives the ability to connect the vehicle with grid at home or at work to charge the Energy Storage System (ESS) easily, especially the battery unit. In addition, the cost and the volume of the power electronics unit (PEU) have reduced. In this research, there are two control strategies have tested to validate the performance of the proposed ...
Conference Proceedings 3rd International Scientific Conference On “Energy Systems With It” At Alvsjö Fair In Association With Energitinget March 16-17 2010, Dr. Erik Dahlquist, Dr. Jenny Palm
Dr. Erik Dahlquist
2010 “The Energiting” is performed for the 12th time. The International Scientific conference is arranged for the 3rd time. The organisers are Swedish Energy Agency, Mälardalen University and the Research School for Energy Systems with LiU, KTH, UU and CTH. The first topic will be “Energy systems” covering use of renewable energy sources, energy conversion and process efficiency improvement with new technologies, as well as societal aspects of the introduction of new technologies. The second topic is “Energy and IT”. This covers energy and load management, interaction between production, distribution and “consumption”, usage of data for decision support and control ...
Measuring Variations Of Mimicry By Means Of Prosodic Cues In Task-Based Scenarios And Conversational Speech, 2010 Dublin Institute of Technology
Measuring Variations Of Mimicry By Means Of Prosodic Cues In Task-Based Scenarios And Conversational Speech, Brian Vaughan, Celine De Looze
Here, we address the measurement of mimicry, that is when speakers’ speech variations look like parallel patterns.
As a definition of mimicry, we often read in the literature description such as mimicry is “The situation where the observed behaviours of two inter-actants although dissimilar at the start of the interaction are moving towards behavioral matching”. These types of descriptions imply that mimicry is a linear phenomenon and that speakers tend to imitate over time. However, it can be assumed, especially when studying spontaneous speech, that there are rather phases of mimicry and non-mimicry and that mimicry should be rather investigated ...
Reverberation-Chamber Test Environment For Outdoor Urban Wireless Propagation Studies, 2010 University of South Carolina - Columbia
Reverberation-Chamber Test Environment For Outdoor Urban Wireless Propagation Studies, Helge Fielitz, Kate A. Remley, Christopher L. Holloway, Qian Zhang, Qiong Wu, David W. Matolak
We introduce a test environment to replicate the well-known clustering of reflections in power delay profiles arising from late-time delays and reflections. Urban wireless propagation environments are known to exhibit such clustering. The test setup combines discrete reflections generated by a fading simulator with the continuous distribution of reflections created in a reverberation chamber. We describe measurements made in an urban environment in Denver, CO, that illustrate these multiple distributions of reflections. Our comparison of measurements made in the urban environment to those made in the new test environment shows good agreement.
Performance Of Self-Encoded Spread Spectrum Under Worst-Case Jamming, 2010 University of Nebraska at Lincoln
Performance Of Self-Encoded Spread Spectrum Under Worst-Case Jamming, Casey L. Deyle
Theses, Dissertations, & Student Research in Computer Electronics & Engineering
Performance of Self-Encoded Spread Spectrum Under Worst-Case Jamming Casey Deyle, M.S University of Nebraska 2009 Advisor: Lim Nguyen Spread Spectrum Communications uses m-sequences (sometimes referred to as Pseudo Noise or PN sequences) modulated with a data signal to create a transmission signal that takes up more bandwidth than the original information signal. Self-Encoded Spread Spectrum (SESS) uses spreading codes generated by the transmitted signal, eliminating the need to synchronize m-sequences between the transmitter and receiver, thus making the channel more secure. This paper will discuss the performance of SESS system in Additive White Gaussian Noise (AWGN) and Rayleigh fading ...