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Filters: Department: "Electrical & Computer Engineering" Collection: "ir_uspace"
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CreatorTitleDescriptionSubjectDate
1 Mathews, V. John; Nilsson, MichaelAdaptive gain processing to improve feedback cancellation in digital hearing aidsAdaptive filters are commonly used to cancel acoustic feedback in hearing aids. The sound quality of hearing aids deteriorates as the hearing aid gain is increased. This paper presents a method to alter the gain function in digital hearing aids to provide additional amplification and better output ...2008
2 Tasdizen, Tolga; Foster, Norman L.Automatic classification of alzheimer's desease vs. frontotemporal dementia: a spatial decision tree aprroach with FDG-PETWe introduce a novel approach for the automatic classification of FDG-PET scans of subjects with Alzheimers Disease (AD) and Frontotemporal dementia (FTD). Unlike previous work in the literature which focuses on principal component analysis and predefined regions of interest, we propose the combined...2008
3 Stevens, KennethCapacitive ionic current measurement in a polymer-electrolyte transistorOrganic transistors that use dissolved ions to conduct current are able to reproduce the current-voltage characteristics of semiconductor transistors. The polymer-electrolyte transistor (PET) consists of a three-source acid-base reaction system, where a polymer gel separates the three source electro...2008
4 Stevens, KennethFamily of 4-phase latch protocolsA complete family of untimed asynchronous 4-phase pipeline protocols is derived and characterised. This family contains all untimed protocols where data becomes valid before the request signal rises. Starting with a specification of the most parallel such protocol, rules are provided for concurre...2008
5 Stevens, KennethFractional-order signal processing using a polymer-electrolyte transistorFractional-order systems have applications in the areas of Flight Control, Robotics, Missile Guidance, Control of Structural Vibrations of Space Platforms and Sensor Technology. Fractional-order transfer functions can characterize complex nonlinear dynamics with many fewer parameters than integer-or...2008
6 Furse, Cynthia M.Iterative array level optimization of MIMO antennasMultiple-input-multiple-output systems have gained importance in the last decade due to their ability to provide improved capacity as compared to their SISO counterparts. System optimization promises further improvement in the capacity. The optimization can be either optimization of detection algori...2008
7 Furse, Cynthia M.Lab report writing (and teaching!) made easyThis paper reports on a project to improve students' ability to write better lab reports and assist teaching assistants (TAs) in grading reports in a consistent manner. A lab report teaching system was developed that includes lab report templates, teaching assistant instructions, grading rubrics, ex...Lab report writing2008
8 Stringfellow, Gerald B.Modulated contrast and associated diffracted intensity of GaPySb1-y layers grown using organometallic vapor phase epitaxyWe have investigated the modulated structures and its associated diffracted diff_x000B_use intensity, of organometallic vapor phase epitaxially grown GaPSb (001) layers by using transmission electron microscopy (TEM) and transmission electron diff_x000B_raction (TED). The TEM results reveal the co-e...Organometallic vapor phase epitaxy; GaPySb1-y layers; Modulated contrast; Diffracted intensity2008
9 Stevens, KennethNetwork simplicity for latency insensitive coresIn this paper we examine a latency insensitive net- work composed of very fast and simple circuits that connects SoC cores that are also latency insensitive, de-synchronized, or asynchronous. These types of cores provide native flow control that is compatible with this network, thus reducing ad...2008
10 Tasdizen, Tolga; Whitaker, Ross T.; Jones, Bryan W.Optimal-path approach for neural circuit reconstructionNeurobiologists are collecting large amounts of electron microscopy image data to gain a better understanding of neuron organization in the central nervous system. Image analysis plays an important role in extracting the connectivity present in these images; however, due to the large size of these ...2008
11 Tasdizen, TolgaPrincipal components for non-local means image denoisingThis paper presents an image denoising algorithm that uses principal component analysis (PCA) in conjunction with the non-local means image denoising. Image neighborhood vectors used in the non-local means algorithm are first projected onto a lower-dimensional subspace using PCA. Consequently, neigh...2008
12 Furse, Cynthia M.; Bergerson, Amy A.Work in progress - Utahs engineering initiativeAbstract - In response to a shortage of engineers in Utah an interdisciplinary team at the University of Utah developed an outreach program intended to increase the number of students recruited into the College of Engineering and who complete engineering degrees. An innovative mix of service l...2008
13 Stringfellow, Gerald B.; Zhu, Jing Yi; Liu, FengDual-surfactant effect to enhance p-type doping in III-V semiconductor thin filmsSurfactant effects are usually achieved by the addition of a single surface element. We demonstrate by first-principles calculations a dual-surfactant effect of Sb and H on enhancing Zn doping in organometallic vapor phase epitaxially grown GaP thin films. The combined effects of Sb and H lower sig...Surfactants; p-type doping2008-11
14 Harrison, Reid R.HermesC: RF wireless low-power neural recording for freely behaving primatesNeural prosthetics for motor systems is a rapidly growing field with the potential to provide treatment for amputees or patients suffering from neurological injury and disease. To determine whether a physically active patient such as an amputee can take advantage of these systems, we seek to devel...HermesC; RF wireless; Low-power; Neural recording; Neural prosthetics; Integrated Neural Interface; Macaques2008-05
15 Furse, Cynthia M.MIMO transmission equationMultiple-input, multiple-output (MIMO) antenna systems such as the one depicted in Fig. 1 offer capacity benefits over their single-input, single-output (SISO) counterparts [1], thus attracting considerable current research. MIMO performance depends on a wide range of parameters [1] including radia...2008-07
16 Furse, Cynthia M.Predicted MIMO performance in intra-vehicle channelsWireless sensor networks inside vehicles face particularly harsh multipath and shadowing constraints. The closed or semi-closed metallic structure functions much like a reverberation chamber, but with some regions shielded from other regions. Vehicles (particularly aircraft) often have extremely hig...2008-07
17 Myers, Chris J.Production-passage-time approximation: a new approximation method to accelerate the simulation process of enzymatic reactionsGiven the substantial computational requirements of stochastic simulation, approximation is essential for efficient analysis of any realistic biochemical system. This paper introduces a new approximation method to reduce the computational cost of stochastic simulations of an enzymatic reaction schem...2008-09
18 Furse, Cynthia M.System level analysis of noise and interference analysis for a MIMO systemMultiple input multiple output antenna communication system are gaining importance in the field of communication and ad-hoc networks due to increase demand for wireless throughput in band-limited channels. A system analysis is not complete without accounting for the system level noise and interfer...2008-07
19 Khan, Faisal HabibUniversal multilevel DC-DC converter with variable conversion ratio, high compactness factor and limited isolation featureA multilevel dc-dc converter with programmable conversion ratio (CR) is presented in this paper. This converter is a modified version of the MMCCC converter. A universal version of the MMCCC is developed in this paper, and the CR can be easily changed within a wide range. The MMCCC converter is bas...2008-02
20 Harrison, Reid R.Wireless integrated circuit for 100-channel neural stimulationWe present the design of an integrated circuit for wireless neural stimulation, along with bench-top and in-vivo experimental results. The chip has the ability to drive 100 individual stimulation electrodes with constant-current pulses of varying amplitude, duration, interphasic delay, and repetiti...Wireless; Integrated Neural Interface; Neural recording; Telemetry2008-11
21 Harrison, Reid R.Wireless neural interface for chronic recordingA primary goal of the Integrated Neural Interface Project (INIP) is to develop a wireless, implantable device capable of recording neural activity from 100 micromachined electrodes. The heart of this recording system is a low-power integrated circuit that amplifies 100 weak neural signals, detect...Integrated Neural Interface; Wireless; Neural recording; Telemetry2008-11
22 Harrison, Reid R.Wireless neural signal acquisition with single low-power integrated circuitWe present experimental results from an integrated circuit designed for wireless neural recording applications. The chip, which was fabricated in a 0.6-μm 2P3M BiCMOS process, contains 100 amplifiers and a 10-bit ADC and 902-928 MHz FSK transmitter. Neural signals from one amplifier are sampled by...Low-power; Wireless; Neural recording; Integrated Neural Interface; INI3; Utah Electrode Array2008-05
23 Simpson, Jamesina J.ADE-FDTD scattered-field formulation for dispersive materialsThis letter presents a scattered-field formulation for modeling dispersive media using the finite-difference time-domain (FDTD) method. Specifically, the auxiliary differential equation method is applied to Drude and Lorentz media for a scattered field FDTD model. The present technique can also be a...2008-01-01
24 Harrison, Reid R.Design of integrated circuits to observe brain activityThe ability to monitor the simultaneous electrical activity of multiple neurons in the brain enables a wide range of scientific and clinical endeavors. Recent efforts to merge miniature multielectrode neural recording arrays with integrated electronics have revealed significant circuit design chall...Amplifiers; Analog integrated circuits; Biomedical signal processing; Low-power circuit design; Neural recording; Subthreshold circuit design; Neural signals; Brain activity2008-01-01
25 Khan, Faisal HabibGenerating isolated outputs in a multilevel modular capacitor clamped DC-DC converter (MMCCC) for hybrid electric and fuel cell vehiclesThis paper presents a new technique to obtain isolated dc voltage outputs from a capacitor clamped dc-dc converter. The multilevel modular capacitor clamped converter (MMCCC) has several key features that make it possible to generate ac outputs (10 kHz) from a dc-dc converter circuit. Using those h...2008-01-01
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