| HAIR Based Sensing and Actuation |
01 Aug 2012 |
33 pages |
| Authors:
Mahdi M Sadeghi; Becky R Peterson; Khalil Najafi; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| High-Temperature Spintronic Devices and Circuits in Absence of Magnetic Field |
23 Apr 2012 |
15 pages |
| Authors:
Pallab Bhattacharya; Supriyo Datta; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
 | The main object of this project was to demonstrate: (a) spin-polarized light sources with large output circular polarization, and (b) spin-based electrical devices that could be ultimately applicable for logic and memory applications operating at high temperatures and in the absence of an externally applied magnetic field. For electrical spin-based devices, our focus shifted to multi-terminal spin valves in the vertical configuration as opposed to the lateral configuration. The long-term ... |
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| Probabilistic and Reliability-Based Health Monitoring Strategies for High-Speed Naval Vessels |
01 Jan 2012 |
31 pages |
| Authors:
Jerome P Lynch; Kincho H Law; Sean O'Connor; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| In this project, a strategy is proposed for fatigue life estimation of a ship hull using a wireless sensor network installed in the hull for autonomous health monitoring. First, a rainflow counting algorithm is implemented as a continuous time-domain approach to fatigue estimation. Cycles are defined by a rainflow counting procedure and are kept on-board the wireless sensing unit in a histogram structure for long-term storage. Fatigue damage is accumulated ... |
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| Model-Based Structural Health Monitoring of Fatigue Damage Test-Bed Specimens |
15 Nov 2011 |
26 pages |
| Authors:
Kincho H Law; Jerome P Lynch; Masahiro Kurata; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| This research project represents a preliminary investigation into a comprehensive analytical, numerical, and experimental framework for the monitoring and life-cycle assessment of the structural integrity and performance of aluminum hull structures. Aluminum plate specimens were designed and fabricated to facilitate the investigation of system identification and damage detection methodologies, both of which are key components of future life-cycle analyses. The design of the plate specimens was intended to include the ... |
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| Program Analysis Techniques for Efficient Software Model Checking |
28 Feb 2011 |
10 pages |
| Authors:
Chandrasekhar Boyapati; Karem Sakallah; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| The need to build next generation air force systems with highly complex functions, but at relatively low cost, will inevitably means a major investment in software. Without highly reliable software, any ambitious air force program cannot succeed. Indeed, software is the keystone (or perhaps the Achilles heel) of most large-scale automation projects; and the problem of making software reliable has become one of today's most important technological challenges. |
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| Modeling, Simulation and Design of Plasmonic Interconnects for On-Chip Signal Processing |
14 Feb 2011 |
11 pages |
| Authors:
Pinaki Mazumder; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| This research studied the capabilities of plasmonics at optical and near infra-red frequencies to propagate electronically modulated plasmon signals over a chain of nanoparticles and nanowires. Since the propagation lengths on wires made of nanoparticles and dielectric clad nanowires are about a few 1 DO's of micrometers, spoof surface plasmon polariton (SSPP) structures are studied to achieve signal propagation over several millimeters which are comparable to global busses in a ... |
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| Ultrafast Mid-Infrared Dynamics in Quantum Cascade Lasers |
07 Jan 2010 |
25 pages |
| Authors:
Theodore B Norris; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This report summarizes the entire research period. In this program, we performed experiments using a femtosecond mid-infrared pump-probe system implemented for QCL samples operating at 4.6 and 5.3 m. We employed femtosecond time-resolved pump-probe measurements to probe the nature of the transport through the laser structure via the dynamics of the gain. The gain recovery was determined by the time-dependent transport of electrons through the cascade heterostructure; as the laser ... |
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| Market-Based Resource Allocation in a Wirelessly Integrated Naval Engineering Plant |
01 Dec 2009 |
63 pages |
| Authors:
Jerome P Lynch; Andrew T Zimmerman; Raymond A Swartz; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| The focus of this research project is the application of wireless sensor networks in naval engineering plant systems for monitoring and control purposes. During the first quarter of the project, research efforts were largely focused upon the design and construction of a wireless sensor prototype explicitly designed for embedment in the complex environments posed by navy vessels. The role of the wireless sensor is to do the following: (1) collect ... |
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| Tunnel Quantum Dot Intersubband Detector for Terahertz Frequencies |
08 Sep 2009 |
13 pages |
| Authors:
Pallab Bhattacharya; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The most significant accomplishments in this project are: (a) the demonstration of a semiconductor based terahertz detector using quantum dots, capable of detection at high temperatures (80-150K) with very low dark currents: (b) a bias-selective multicolor long wavelength quantum dot intersublevel detector with tunability over 3 distinct wavelengths. The detector incorporates a novel double barrier tunneling heterostructure with each absorbing quantum dot layer; (c) a novel intersubband quantum ring terahertz ... |
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| Erbium Doped Quantum Dot and Si:O and Plasmon Resonance Enabled Quantum Dot Nanoscale Lasers |
31 Aug 2009 |
13 pages |
| Authors:
Pallah Bhattacharya; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| The most significant accomplishments in this project are: (a) the demonstration of optically pumped silicon based light emitters utilizing colloidal PbSe QD which are inserted in PC microcavities for efficient coupling. Enhancements of spontaneous emission with a linewidth of-2.0 run, corresponding to a cavity Q factor of 775, is observed at 1550 nm at room temperature; (b) an electrically injected silicon based light source using PbSe QDs, which are more ... |
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| Unsupervised Object Pose Classification from Short Video Sequences |
Jan 2009 |
13 pages |
| Authors:
Liang Mei; Min Sun; Kevin M Carter; Hero; Alfred O III; Silvio Savarese; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| We address the problem of recognizing the pose of an object category from video sequences capturing the object under small camera movements. This scenario is relevant in applications such as robotic object manipulation or autonomous navigation. We introduce a new algorithm where we model an object category as a collection of non parametric probability densities capturing appearance and geometrical variability within a small area of the viewing sphere for different ... |
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| Evaporation-Driven Charge Redistribution and Current Generation for Energy Harvesting Applications |
Dec 2008 |
9 pages |
| Authors:
Ruba T Borno; Joseph Steinmeyer; Michel M Maharbiz; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| The development of low power wireless sensor networks has generated interest in previously unsuitable energy harvesting methods as viable sources of power. We present a microfabricated synthetic leaf that can generate output voltages of 2 - 5 mu(V) for each motion of a gas-liquid interface due to the mechanical energy of evaporation-driven flow. The presented results provide a proof of concept for the use of evaporation-driven flow as a scalable ... |
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| Thin Film Ferroelectric Tunable Devices for Reconfigurable Radios |
Dec 2008 |
7 pages |
| Authors:
Xinen Zhu; Jia S Fu; Victor Lee; Amir Mortazawi; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| In this paper, a summary of our work in the area of tunable microwave circuits based on thin film ferroelectrics is presented. First, a technique is introduced to improve the linearity of thin film ferroelectric tunable capacitors. Measurements show an improvement in the 3rd order intermodulation point at the input (IIP3) of 16 dB. Next, the design and fabrication of an impedance tuner employing thin film ferroelectric capacitors for applications ... |
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| Nonlinear Optics and Coherent Optical Control of Single Electron Systems |
Aug-2008 |
12 pages |
| Authors:
Duncan G Steel; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| Work on this program was aimed at developing and understanding nano-optical structures with emphasis on developing quantum optical based devices. Specific work focused on semiconductor quantum dots. During this research period, a number of important discoveries were made as well as critical demonstrations of importance to future technology. The discoveries include the prediction and observation of spontaneous emission induced coherence and the unexpected control of nuclear field fluctuations through coherent ... |
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| Demonstration and Modeling of Material Responses Achieved Through Contradirectional Coupling |
14 MAY 2008 |
19 pages |
| Authors:
Anthony Grbic; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This report describes the development of broadband and reduced-loss negative permeability and negative refractive index metamaterials at microwave frequencies. The reported structures exhibit fractional bandwidths that are greater than 40%. Simulation and experimental results are described which confirm the electromagnetic properties of the proposed structures. Analytical modeling of the proposed structures is also discussed. |
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| Low-Loss 4-6 GHz Tunable Filter with 3-Bit High-Q Orthogonal RF-MEMS Capacitance Network |
23 MAR 2008 |
18 pages |
| Authors:
Kamal Sarabandi; Sang-June Park; Mohammed A. El-Tanani; Isak Reines; Gabriel M. Rebeiz; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| A low loss 4-6 GMz 3-bit tunable filter was designed and fabricated on a quarz substrate. A high-Q 3-bit orthogonal RF-MEMS capacitance network is presented and its significance on the filter Q is discussed. Detailed design equations for the capacitively-loaded coupled open-loop,=2 resonators and realization of capacitive external coupling with source-load impedance loading are discussed. The measured filter shows an unloaded-Q of 85-170, an insertion loss of 1.5-2.8 dB (including ... |
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| Optically Driven Spin Based Quantum Dots for Quantum Computing |
Jan 2008 |
109 pages |
| Authors:
Duncan G Steel; L J Sham; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This program conducted experimental and theoretical research aimed at developing an optically driven quantum dot quantum computer. In addition to the two co-principal investigators (Sham and Steel), the work was done in collaboration with Dan Gammon at the Naval Research Laboratory. D. Gammon had responsibility for designing, fabricating and basic spectroscopy of the material, LJ Sham is responsible for theoretical support and concept development, and DG Steel is responsible for ... |
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| Studies of Spin Amplifier for Logic Applications |
NOV 2007 |
7 pages |
| Authors:
Pallab Bhattacharya; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| A ferromagnet/semiconductor based electrically controlled spin-current amplifier using a dual-drain non-local lateral spin valve was demonstrated. The spin polarization injected by the source into the channel was amplified at the second drain contact. An amplified current spin polarization of 100% was measured. The device provided controlled spin-current gain, which was varied in the entire range from -1 to +1. The controlled variation of amplifier gain with bias was also demonstrated. ... |
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| Robustly Single-mode Polarization Maintaining Er/Yb co-doped LMA Fiber for High Power Applications |
08 May 2007 |
4 pages |
| Authors:
A Carter; J Faroni; K Tankala; B Samson; D Machewirth; N Jacobson; W Torruellas; Y Chen; M-Y Cheng; A Galvanauskas; A Sanchez; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| We demonstrate a large core diameter PM Er/Yb fiber incorporating a unique raised inner-cladding which facilitates the use of conventional LMA mode selection techniques to achieve robustly single-mode operation, making it ideally suited to high power applications. |
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| On Software Protection in Embedded Systems |
Feb 2007 |
7 pages |
| Authors:
Jisoo Yang; Kang G Shin; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| We argue that the conventional privilege separation of a processor has inherent limitations in protecting software with higher security requirements, and hence, a new system of protection should be devised to overcome these limitations. To enable the new protection, an operating system needs to be restructured into two layers: the security kernel which implements the new protection system, and the management kernel which manages resources. The security kernel protects the ... |
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| Design Technologies for Energy-Efficient VLSI Systems |
20 Jan 2007 |
19 pages |
| Authors:
Marios C Papaefthymiou; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| This project has investigated novel design technologies for energy-efficient VLSI systems. Its primary focus has been on charge-recovery circuits. These circuits achieve higher energy efficiency than their conventional counterparts by steering currents to flow across devices with low voltage drops, while recycling undissipated energy in parasitic capacitors. Previous investigations into charge recovery have resulted in complex circuits and architectures that are impractical for high-speed design. This project has led to ... |
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| Interactive Diagrammatic Knowledge Management Tools for Human Behavior Models |
08 MAR 2006 |
15 pages |
| Authors:
John E. Laird; Douglas J. Pearson; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| The last 10 years have produced a revolution in the complexity and realism of human behavior models (HBMs). However, the cost of developing realistic HBMs continues to increase as much of the detailed and complex knowledge must be manually encoded to produce realistic behavior. The focus of this project is on reducing the cost of acquiring, validating, and maintaining the knowledge used in realistic HBMs. The author's approach is to ... |
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| A Student Get-Away-Special Space Shuttle Experiment to Demonstrate Cold-Cathode Field Emitter Technology in Space (FEGI). NANOSAT FY03 |
09 FEB 2006 |
35 pages |
| Authors:
Brian Gilchrist; Dave Morris; Tom Liu; Chris Deline; Rafael Ramos; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This document describes the design of and preparations undertaken to close out work on the Field Emission Get-Away-Special Investigation (FEGI) project. Due to the cancellation of the NASA Get-Away-Special Program (GAS) following the Columbia space shuttle accident, work on the FEGI project terminated with the fabrication and testing of the Engineering Design Unit (EDU). Although FEGI did not fly as a GAS payload, the project has provided valuable personnel training, ... |
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| Optically Controlled Quantum Dot Spins for Scaleable Quantum Computing |
17 JAN 2006 |
8 pages |
| Authors:
Duncan G. Steel; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This program conducted experimental research aimed at developing an optically driven quantum dot quantum computer. The work was done in collaboration with D. Gammon at the Naval Research Laboratory and L. J. Sham at UCSD. D. Gammon had responsibility for growing & characterizing the material, L. J. Sham is responsible for theoretical support & concept development. The group at Michigan along with this QuaCGR student are responsible for experimental demonstration ... |
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| Design of Location Service for a Hybrid Network of Mobile Actors and Static Sensors |
2006 |
15 pages |
| Authors:
Zhigang Chen; Min-gyu Cho; Kang G. Shin; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| Location services are essential to many applications running on a hybrid of wirelessly-networked mobile actors and static sensors, such as surveillance systems and the Pursuer and Evader Game (PEG). To our best knowledge, there has been no previous location service protocol for wireless sensor networks. A number of location service protocols have been proposed for mobile ad hoc networks, but they are not applicable to sensor networks due to the ... |
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| Computational Modeling of Human Multiple-Task Performance |
SEP 2005 |
9 pages |
| Authors:
David E. Kieras; David Meyer; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| This is the final report for a project that was a continuation of an earlier, long-term project on the development and validation of the EPIC cognitive architecture for modeling human cognition and performance. The report summarizes the results and lists the products and publications resulting from the project. These including the modeling system software, tutorials, fundamental architecture development, modeling of visual search, and empirical work on working memory and procedure ... |
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| Optically Controlled Quantum Dots for Quantum Computing |
21 APR 2005 |
21 pages |
| Authors:
Duncan G. Steel; Lu J. Sham; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This program conducted experimental & theoretical research aimed at developing an optically driven quantum dot quantum computer. In addition to the 2 %Pl's, the work was done in collaboration with Dan Gammon at the Naval Research laboratory. D. Gammon had responsibility for growing & characterizing the material, U Sham is responsible for theoretical support & concept development & DG Steel is responsible for experimental demonstration of key experimental demonstrations for ... |
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| Three-Dimensional THz Imaging |
20 APR 2005 |
20 pages |
| Authors:
Theodore B. Norris; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| Three-dimensional imaging has been demonstrated using a single-cycle terahertz electromagnetic pulses. Reflection-mode imaging was performed with photoconductive transmitter and receiver and a reconstruction algorithm based on time reversal. A two-dimensional array was synthesized from ten concentric ring annular arrays with numerical apertures ranging from 0.27 to 0.43. The system clearly distinguished image planes separated by 1.5 mm and achieved a lateral resolution of 1.1 mm. In terms of the illuminating ... |
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| Investigation of Image Formation in Scattering and Other Irregular Media |
02 MAR 2005 |
9 pages |
| Authors:
Emmett N. Leith; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| A new theory of image formation through scattering media was developed based on Fourier optics and optical information concepts. This theory predicts the capabilities and limitations of the first-arriving-light method of imaging through highly scattering media in a way that is totally different from conventional transport and diffusion theory. A highly generalized theory of optical sectioning by holographic means was carried out. The method shows the basic similarities between broad-source ... |
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| Experimental and Modeling Investigation of Microwave Radiometer Noise Statistics for Earth Remote Sensing |
2005 |
5 pages |
| Authors:
Hanh Pham; A. W. England; Victor Solo; E. J. Kim; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| Recent availability of high-speed analog to digital converters (ADC) has enabled the development of digital radiometers for Earth remote sensing. In the unprotected C band, undesired radio frequency interferences (RFI) have been observed and mitigation efforts are currently being carried out in the research community. They mainly consist of detection and filtering in the time or frequency domain. Because RFI can be very small and mistaken as geophysical signals, an ... |
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| Boost Logic: A High Speed Energy Recovery Circuit Family |
2005 |
16 pages |
| Authors:
MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| In this paper, we propose Boost Logic, a logic family which relies on voltage scaling, gate overdrive and energy recovery techniques to achieve high energy efficiency at frequencies in the GHz range. The key feature of our design is the use of an energy recovering boost stage to provide an efficient gate overdrive to a highly voltage scaled logic at near threshold supply voltage. We have evaluated our logic family ... |
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| Multiple Model Particle Filtering For Multi-Target Tracking |
20 DEC 2004 |
33 pages |
| Authors:
Alfred Hero; Chris Kreucher; Keith Kastella; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This paper addresses the problem of tracking multiple moving targets by recursively estimating the joint multitarget probability density (JMPD). Estimation of the JMPD is done in a Bayesian framework and provides a method for tracking multiple targets which allow nonlinear target motion and measurement to state coupling as well as non-Gaussian target-state densities. We utilize an implementation of the JMPD method based on particle filtering (PF) techniques. The details of ... |
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| Asymptotic Connectivity of Low Duty-Cycled Wireless Sensor Networks |
DEC 2004 |
3 pages |
| Authors:
Dongsook Kim; Chih-fan Hsin; Mingyan Liu; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The Army's Future Combat Systems potentially rely heavily on the efficient use of unattended sensors to detect, identify and track targets in order to enhance situation awareness, agility and survivability. Among different types of sensors, the unattended ground sensors (UGS) are typically deployed and left to self-organize and carry out various sensing, monitoring, surveillance and communication tasks. These sensors are operated on battery power, and energy is not always renewable ... |
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| Adaptive Multi-modality Sensor Scheduling for Detection and Tracking of Smart Targets |
Oct-2004 |
7 pages |
| Authors:
Chris Kreucher; Doron Blatt; Hero; Alfred O III; Keith Kastella; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This paper considers the problem of sensor scheduling for the purposes of detection and tracking of smart targets. Smart targets are targets that are able to detect when they are under surveillance and react in a manner that makes future surveillance more difficult. We take a reinforcement learning approach to adaptively schedule a multi-modality sensor so as to most quickly and effectively detect the presence of smart targets and track ... |
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| Compound Semiconductor Based Two-Dimensional Photonic Crystal Light Sources |
10 AUG 2004 |
32 pages |
| Authors:
Pallab Bhattacharya; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| Two-dimensional photonic crystals (PC) have emerged as promising building blocks for integrated optics systems. Photonic crystal devices exploit defects, in an otherwise periodic lattice designed to exhibit a wide photonic bandgap (PBG), to form resonant microcavities or optical waveguides. The property of PC microcavities to enhance the source radiation into a desired mode while inhibiting other modes is particularly appealing for development of ultra- low threshold, single-mode lasers. In this ... |
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| Investigation of Quantum Dot Lasers |
09 AUG 2004 |
17 pages |
| Authors:
Pallab Bhattacharya; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| Since the first demonstration of room-temperature operation of self- assembled quantum dot (QD) lasers about a decade ago, there have been great strides in improving the characteristics and performance of these lasers. They currently match or surpass the performance of quantum well lasers. However, there are unique problems that limit the performance of conventional separate confinement heterostructure (SCH) QD lasers compared to what is expected from "ideal" lasers with near ... |
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| Quantum Dot Intersubband Long-Wavelength Detector Arrays |
18 JUN 2004 |
13 pages |
| Authors:
P. Bhattacharya; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| In(Ga,Al)As/(Ga,Al)As QDIPs are positioned to become an important technology in the field of IR detection, particularly for the type of high- temperature, low-cost, high-yield detector arrays required for the military and other highly sophisticated applications. This research has advanced the state- of-the-art in QDIP performance, demonstrating that it is reasonable to incorporate these devices into a FPA operating at 150 K for MWIR detection. For example, at this temperature of ... |
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| Compact Reconfigurable HF-UHF Antennas |
07 JUN 2004 |
134 pages |
| Authors:
Kamal Sarabandi; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The development of a compact reconfigurable HF-UHF antenna is of great practical importance in mobile military communications where low visibility and high mobility are required Variations of monopole and diPOLE ANTENNAS IN USE TODAY ARE NARROWBAND AND ARE PROHIBITIVELY LARGE AND BULKY AT THESE FREQUENCIES Broadband antennas are not only large but also suffer from jamming susceptibility and undesirable complex multiplexing requirements. Development of efficient small geometry planar and reconfigurable ... |
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| Cross-Layer Design and Analysis of Wireless Networks |
02 JUN 2004 |
52 pages |
| Authors:
Wayne Stark; Achilleas Anastasopoulos; Shihyu Chang; Hua Wang; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| We have shown certain invariants (optimum distance, optimum error probability); by considering a couple layers joint design/optimization and analysis is possible; insight into performance analysis can be obtained; still need to consider many other factors (power control, data rate control, multiple access capability of modulation and coding); there are many open and interesting problems in cross-layer design. |
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| Power Analyzer for Pocket Computing (PAPC) |
JAN 2004 |
58 pages |
| Authors:
Trevor Mudge; Nam S. Kim; Jeffrey Ringenberg; Taeho Kgil; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| Under this contract researchers at the Universities of Michigan and Colorado have developed an innovative and practical power evaluation tool, Power Analyzer, suitable for calculating power consumption for complete computer systems. Power Analyzer will be initially targeted to pocket computers where computing and communication place strong demands on the portable power supply. |
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| Adaptive Optoelectronic Eye |
23 DEC 2003 |
53 pages |
| Authors:
Pallab Bhattacharya; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The objective of this multidisciplinary research program was to develop a versatile image sensor technology where advances in optical devices and merging of optoelectronic, micro-optic and micromechanical components would allow the feasibility of tightly coupled adaptive focal plan arrays. We adopted a layered architecture in which the essential elements were: The front-end optics consisting of a variable focus Fresnel lens, a microlens array and a microprism array for color dispersion ... |
|
| Solid State THz Sources |
23 SEP 2003 |
37 pages |
| Authors:
Dimitris Pavlidis; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| High layer quality GaN NDR layers have been grown in house by newly setup MOCVD facility. Record quality AIN layers were grown for high thermal conductivity substrateless diodes with improved thermal management. GaN Gunn diodes were designed and fabricated on Si substrates with high thermal conductivity. Combined with the use of small size devices they allowed to bias GaN NDR diodes under electric fields suitable for oscillation. Liquid Nitrogen Characterization ... |
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| A Novel Approach for Bandwidth Enhancement of Slot Antennas |
SEP 2003 |
13 pages |
| Authors:
Nader Behdad; Kamal Sarabandi; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| A novel approach is presented to improve the bandwidth of slot antennas. The technique is based on manipulating the field distribution along an ordinary resonant slot structure using the feed line and creating a dual resonance behavior. Hence without changing the length of the antenna its bandwidth is increased by more than 200% relative to a narrow slot. The field distribution along the slot at a frequency slightly above its ... |
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| Low-Energy VLSI Circuit Architectures |
07 JUL 2003 |
20 pages |
| Authors:
Marios C. Papaefthymiou; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This project has investigated novel circuit architectures for low- energy VLSI systems. Its primary focus has been on charge-recovering (a.k.a. adiabatic) circuits. By steering currents across devices with low voltage drops and by recycling undissipated energy, these circuits can operate more efficiently than their conventional digital counterparts. Early investigations into adiabatic circuits have yielded very complex designs that are impractical for high-speed design. This project has led to the discovery ... |
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| Microfabrication Techniques for Plastic Microelectromechanical Systems (MEMS) |
JUL 2003 |
147 pages |
| Authors:
C. H. Mastrangelo; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This report presents research and development of new micromachining techniques and fabrication technologies for the construction of plastic MEMS devices. Plastic MEMS are of major importance in the implementation of miniature chemical reaction systems, such as DNA diagnostic, bacteriophage, and other bio- assays chips. Further, because of their low temperature construction, plastic MEMS devices can be integrated with conventional electronic circuits easily and inexpensively. Three main technology directions were conducted. ... |
|
| Intelligent Electronics Manufacturing: Modeling and Control of Plasma Processing |
13 MAY 2003 |
64 pages |
| Authors:
Pramod P. Khargonekar; Fred L. Terry Jr; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The MURI Center on Modeling and Control of Plasma Processing at the University of Michigan started in September, 1995, and concluded technical work at the end of August 2001. As the name indicates, the major research goals of the center are in the areas of modeling and control of plasma deposition and etching processing. These plasma processes are used extensively in the manufacture of integrated circuits as well as active ... |
|
| Compact Reconfigurable High-Frequency Ultrahigh Frequency (HG-UHF) antenna |
2003 |
71 pages |
| Authors:
Kamal Sarabandi; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The goal of this research effort was the development of computer algorithms for the predication of radio wave propagation in forest or Vegetated environments. In addition, recognizing the need for measured data sets for validation of such modesi, two measurements Campaigns were conducted, one to determine path loss for near-Earth propagation and one which utilizes a unique, synchronized, long-range measurement system (the system has been tested to over a kilometer, ... |
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| Design and Analysis of a Flipping Controller for RHex |
2003 |
19 pages |
| Authors:
Uluc Saranli; Daniel E. Koditschek; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| We report on the design and analysis of a controller that can achieve dynamical self-righting of our hexapedal robot, RHex. We present an empirically tuned controller that works reasonably well on indoor surfaces, using a hybrid energy pumping strategy to overcome torque limitations of its actuators. Subsequent modeling and analysis yields a new controller with a much wider domain of success as well as a preliminary understanding of the hybrid ... |
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| Energy-Aware Quality of Service Adaptation |
2003 |
33 pages |
| Authors:
Padmanabhan Pillai; Hai Huang; Kang G. Shin; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| In a wide variety of embedded control applications, it is often the energy resources that form the fundamental limits on the system, not the system's computing capacity. Various techniques have been developed to improve energy efficiency in hardware, such as Dynamic Voltage Scaling (DVS), effectively extending the battery life of these systems. However, a comprehensive mechanism of task adaptation is needed in order to make the best use of the ... |
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| Sprint-and-Halt Scheduling for Energy Reduction in Real-Time Systems with Software Power-Down |
2003 |
21 pages |
| Authors:
Padmanabhan Pillai; Kang G. Shin; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| Mobile computing platforms are performing increasingly complex and computationally intensive tasks. To help lengthen useful battery life, these platforms often incorporate some form of hardware power-down that is controlled by the system software. Unfortunately, these often incur substantial transition latencies when switching between power-down and active states, making them difficult to use in time-critical embedded systems. This paper introduces a class of sprint-and-halt schedulers that attempt to maximize the energy ... |
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