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Full-Text Articles in Engineering
Optical System With 1xn Interleaver And Methods Of Making And Using Same, Michael A. Scobey, Lucien P. Ghislain, Dennis J. Derickson, Loren F. Stokes
Optical System With 1xn Interleaver And Methods Of Making And Using Same, Michael A. Scobey, Lucien P. Ghislain, Dennis J. Derickson, Loren F. Stokes
Electrical Engineering
An optical system and method are disclosed for multiplexing or de-multiplexing channels within a wavelength band. The optical signals carried on the system comprise separate channels 1 through n, each having a unique passband and a center wavelength spaced from the center wavelength of adjacent channels by d nm. The signals are semi-multiplexed, demultiplexed, or semi-demultiplexed by an interleaver comprising optically matched and directly optically coupled etalons. Periodic spectral passbands of width less than d nm, spaced from each other a distance of zd, where z is an integer greater than or equal to 3, are substantially transmitted through the …
Preliminary Assessment Of Experimental Sophomore Ee Courses, James G. Harris, Kena Burke
Preliminary Assessment Of Experimental Sophomore Ee Courses, James G. Harris, Kena Burke
Electrical Engineering
In academic year 2001-2002, an experimental yearlong sequence of courses was taught to EE and CPE majors that replaced the traditional circuits and electronics sequence of required courses. The experimental sequence consisted of three quarters, with the first quarter devoted to digital signal processing, and the next two quarters formed from an integrated approach to circuits and electronics. The two sections of students who took the experimental course now are taking the junior year required courses in their major. An assessment is being made to compare the experimental students with a cohort of traditional students. Preliminary results are given for …
Polyphase Filter With Low-Pass Response, Vladimir I. Prodanov, Peter Kiss, Mihai Banu
Polyphase Filter With Low-Pass Response, Vladimir I. Prodanov, Peter Kiss, Mihai Banu
Electrical Engineering
A complex low-pass filter that reduces the influence of component mismatch. The filter includes a first filter section for effecting a first single pole transfer function and a second filter section for effecting a second single pole transfer function, where the first and the second single pole transfer functions collectively define a conjugate pair of poles. In higher order low-pass filters, an optimal cascade order follows a shoestring pattern.
Deterministic Surface Registration At 10hz Based On Landmark Graphs With Prediction, Fred W. Depiero
Deterministic Surface Registration At 10hz Based On Landmark Graphs With Prediction, Fred W. Depiero
Electrical Engineering
Landmark graphs provide a means for surface registration, based on determining subgraph isomorphism to find scene-to-scene correspondences. Surface data used herein included both range and colour imagery. Images were acquired of a static scene from a moving sensor. The continuous motion allowed the sensor position to be predicted, which helped stabilize graph formation. Landmarks were determined using the KLT corner detector. Graph structure was established using nodes (landmarks) and edges that agreed well with predicted locations. Subgraph matching was approximated using the LeRP algorithm. A 6 DOF rigid transformation including translation and rotation was found via Horn’s method. Test results …
Surface Registration At 10hz Based On Landmark-Graphs: Benefits For A Scalable Remote Viewing System, Fred W. Depiero
Surface Registration At 10hz Based On Landmark-Graphs: Benefits For A Scalable Remote Viewing System, Fred W. Depiero
Electrical Engineering
Real-time surface registration is a key technology for the development of future remote viewing systems. An architecture for a video distribution system supporting multiple users, with individual viewpoint selection, is suggested. The approach would provide a transmission bandwidth independent of the number of users, for scalability. The proposed architecture uses a method of surface registration based on landmark-graphs. Results from 141 test trials on synthetic scenes indicate that a mean absolute positioning accuracy under 1% of the sensor field of view is possible. The mean rate for registration was 10Hz, with a standard deviation under 10%. Tests were benchmarked on …
Actuator Fault Compensation For A Helicopter Model, Xiao-Hua Yu
Actuator Fault Compensation For A Helicopter Model, Xiao-Hua Yu
Electrical Engineering
A fault-tolerant system is the one that can continue its operation without significant impact on performance in the presence of hardware and/or software errors. In this paper, the design of a fault-tolerant flight controller to control UH-60 helicopter is investigated. A 9th-order state space representation of the helicopter model operating at the forward mode with 80 knots is presented; then a fault-tolerant optimal feedback controller is designed and tested.
Apparatus, Method And System For Common-Mode Stabilization In Circuits Having Differential Operation, George Palaskas, Vladimir Prodanov
Apparatus, Method And System For Common-Mode Stabilization In Circuits Having Differential Operation, George Palaskas, Vladimir Prodanov
Electrical Engineering
A system, method and apparatus are disclosed for common-mode voltage feedback. The preferred system includes a plurality of differential circuits, a corresponding plurality of common-mode voltage detectors, a corresponding plurality of buffer circuits, and a common-mode control circuit. Each differential circuit is operative to produce a first differential output voltage and a second differential output voltage. Each corresponding common-mode voltage detector is operative to provide a common-mode voltage from the first differential output voltage and the second differential output voltage. The common-mode control circuit provides a control voltage signal from the common-mode voltage and from a reference voltage. Each buffer …
A Neuromorphic Controller For A Distillation Column, Xiao-Hua Yu
A Neuromorphic Controller For A Distillation Column, Xiao-Hua Yu
Electrical Engineering
This paper investigates the design of a neural network based controller to control the concentration of the overhead and bottom product in the model of a distillation column. Satisfactory computer simulation results of this approach are obtained.
Cmos Transconductor With Increased Dynamic Range, Vladimir I. Prodanov
Cmos Transconductor With Increased Dynamic Range, Vladimir I. Prodanov
Electrical Engineering
A CMOS transconductor that operates with increased dynamic range while maintaining one or more other basic operating characteristics at substantially the same value in comparison to a prior art transconductor circuit is provided. One embodiment, among others, comprises an input stage circuit comprising several pluralities of transistors with each plurality configured such that certain terminals of the transistors are electrically connected, and the several pluralities are electrically interconnected through one or more terminals of each plurality. Another embodiment comprises modifying an input stage of an existing transconductor circuit to provide a transconductor circuit that operates with increased dynamic range while …
Method And Apparatus For Modulating Digital Data, Jack Glas, Vladimir I. Prodanov, Maurice Tarsia
Method And Apparatus For Modulating Digital Data, Jack Glas, Vladimir I. Prodanov, Maurice Tarsia
Electrical Engineering
The modulator includes an oscillator generating signals, each having a different phase, and a selector receiving digital data. When the digital data received by the selector changes logic state, the selector supplies a first and second plurality of signals generated by the oscillator to first and second non-linear amplifiers, respectively. An adder then adds the output of each amplifier to generate a radio frequency output.
Complex Low-Pass Filters, Peter Kiss, Vladimir I. Prodanov, Jack Glas
Complex Low-Pass Filters, Peter Kiss, Vladimir I. Prodanov, Jack Glas
Electrical Engineering
Zero-if transceivers suffer from the imbalance of the I and Q paths. By using a complex low-pass filter topology instead of a conventional pair of real low-pass filters, this imperfection can be reduced. Both analytical and numerical analysis show that the proposed technique is significantly more robust to circuit imperfections than the traditional architecture.
An Algorithm Using Length-R Paths To Approximate Subgraph Isomorphism, Fred Depiero, David Krout
An Algorithm Using Length-R Paths To Approximate Subgraph Isomorphism, Fred Depiero, David Krout
Electrical Engineering
The ‘LeRP’ algorithm approximates subgraph isomorphism for attributed graphs based on counts of length-r paths. The algorithm provides a good approximation to the maximal isomorphic subgraph. The basic approach of the LeRP algorithm differs fundamentally from other methods. When comparing structural similarity LeRP uses a neighborhood of nodes that varies in size dynamically. This approach provides sufficient evidence of similarity to permit LeRP to form a node-to-node mapping and can be computed with polynomial effort in the worst-case. Results from over 32,000 simulated cases are reported. We demonstrate that LeRP does not need a high dynamic range of node and …
Improving Dsp Performance With A Small Amount Of Field Programmable Logic, John Y. Oliver, Venkatesh Akella
Improving Dsp Performance With A Small Amount Of Field Programmable Logic, John Y. Oliver, Venkatesh Akella
Electrical Engineering
We show a systematic methodology to create DSP + field-programmable logic hybrid architectures by viewing it as a hardware/software codesign problem. This enables an embedded processor architect to evaluate the trade-offs in the increase in die area due to the field programmable logic and the resultant improvement in performance or code size. We demonstrate our methodology with the implementation of a Viterbi decoder. A key result of the paper is that the addition of a field-programmable data alignment unit (FPDAU) between the register-file and the computational blocks provides 15%-22% improvement in the performance of a Viterbi decoder on the state-of-the-art …