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An intelligent circuit analysis module to analyze student queries in the Universal Virtual Laboratory

An intelligent circuit analysis module to analyze student qu...

引用

Frontiers in Education - 35th Annual Conference 2005, FIE' 05

作者： Mahalingam, Annapoorna Butz, Brian P. Duarte, Michael Intelligent Systems Application Center Electrical and Computer Engineering Department Temple University Philadelphia PA 19122

ISBN: (纸本)0780390776

This paper presents an intelligent circuit analysis module that is capable of analyzing electrical circuits and determining equivalence. We discuss the module in context of a National Science Foundation funded project - Universal Virtual laboratory (UVL). UVL is a virtual electrical engineering laboratory for able and disabled individuals to construct, simulate and understand the characteristics of basic electrical circuits. This paper discusses the development of an intelligent circuit analysis module called the Circuit Recognizer (CR). The CR is a program that has knowledge of circuit theory concepts, and is capable of using this knowledge to provide assistance to a student while he/she is performing the experiments in UVL. While verifying circuit configuration it identifies errors and provides explanations that guide the student to a better understanding of the experiment. The ultimate objective of the CR is to evaluate the effectiveness of the teaching strategies employed within the UVL as well as to enhance the learning abilities of students. © 2005 IEEE.

关键词： Electric network analysis

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Drive circuit for a mode conversion rotary ultrasonic motor

Drive circuit for a mode conversion rotary ultrasonic motor

引用

IECON 2005: 31st Annual Conference of IEEE Industrial Electronics Society

作者： Xu, Jian Grant, Edward Kingon, Angus I. Wilson, John M. Franzon, Paul D. Department of Electrical and Computer Engineering Center for Robotics and Intelligent Machines North Carolina State University Raleigh NC 27695 United States

ISBN: (纸本)0780392523

A mode conversion rotary ultrasonic motor (USM) has potential applications in miniature robotics. However, its electrical drive circuit presents some unique challenges, particularly in producing a high frequency (∼40kHz), high voltage (∼200V peak-to-peak) signal into a low impedance (∼100Ω) capacitive motor, while achieving high efficiency. This paper describes the design of such a drive circuit, intended for use with a 12V battery. The drive circuit consists of a switch-mode power converter driving the USM via a step-up planar transformer. Compensation and resonant elements are added to improve the power efficiency. While the peak efficiency of this circuit is 45%, in practice the equivalent impedance of the USM changes with mechanical load and temperature, resulting in an average efficiency of 16%. The admittance vs. frequency characteristic and the equivalent electrical model for a USM prototype are also presented in this paper. The circuit simulations and loaded testing of a full-bridge DC-AC resonant converter with DC-offset module were performed. A load-adapted frequency tracking method has also been proposed to improve the efficiency and stability of the drive circuit. © 2005 IEEE.

关键词： Networks (circuits)

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Optical flow-based tracking of deformable objects using a non-prior training active feature model 5th

Optical flow-based tracking of deformable objects using a no...

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5th Pacific Rim Conference on Multimedia, PCM 2004

作者： Kim, Sangjin Kang, Jinyoung Shin, Jeongho Lee, Seongwon Paik, Joonki Kang, Sangkyu Abidi, Besma Abidi, Mongi Image Processing and Intelligent Systems Laboratory Department of Image Engineering Graduate School of Advanced Imaging Science Multimedia and Film Chung-Ang University 221 Huksuk-Dong Tongjak-Ku Seoul156-756 Korea Republic of Imaging Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering The University of Tennessee KnoxvilleTN37996-2100 United States

ISBN: (纸本)9783540239857

This paper presents a feature point tracking algorithm using optical flow under the non-prior training active feature model (NPT-AFM) framework. The proposed algorithm mainly focuses on analysis of deformable objects, and provides real-time, robust tracking. The proposed object tracking procedure can be divided into two steps: (i) optical flow-based tracking of feature points and (ii) NPT-AFM for robust tracking. In order to handle occlusion problems in object tracking, feature points inside an object are estimated instead of its shape boundary of the conventional active contour model (ACM) or active shape model (ASM), and are updated as an element of the training set for the AFM. The proposed NPT-AFM framework enables the tracking of occluded objects in complicated background. Experimental results show that the proposed NPT-AFM-based algorithm can track deformable objects in real-time. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Optical flows

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The intelligent Universal Virtual Laboratory (UVL)

The Intelligent Universal Virtual Laboratory (UVL)

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Frontiers in Education (FIE) Conference

作者： M. Duarte A. Mahalingam B.P. Butz Intelligent Systems Application Center Electrical & Computer Engineering Department Temple University Philadelphia PA USA Intelligent Systems Application Center Electrical & Computer Engineering Department Temple University USA Electrical & Computer Engineering Department Temple University USA

The objective of this project was to create a realistic, real-time, electrical engineering virtual laboratory. This project targets individuals who do not have adequate mobility of their upper bodies to perform laboratory experiments. To provide a more realistic and enhanced learning experience, the users of the virtual laboratory are allowed the freedom to build and test a wide variety of realistic electrical circuits, and be able to perform curriculum-based experiments. The main goal is to create an environment similar to a real electrical engineering laboratory, and to offer the user a way to learn the different aspects of instrumentation and circuitry

关键词： Laboratories Competitive intelligence User interfaces Application software Circuit simulation intelligent systems electrical engineering Circuit testing Instruments Computational modeling

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A Combinational Approach to the Fusion, De-noising and Enhancement of Dual-Energy X-Ray Luggage Images

A Combinational Approach to the Fusion, De-noising and Enhan...

引用

IEEE computer Society Conference on computer Vision and Pattern Recognition Workshops (CVPRW)

作者： Zhiyu Chen Yue Zheng B.R. Abidi D.L. Page M.A. Abidi Imaging Robotics and Intelligent Systems Laboratory Electrical and Computer Engineering Department University of Tennessee Knoxville TN USA

X-ray luggage inspection systems play an important role in ensuring air travelers’ security. However, the false alarm rate of commercial systems can be as high as 20% due to less than perfect image processing algorithms. In an effort to reduce the false alarm rate, this paper proposes a combinational scheme to fuse, de-noise and enhance dual-energy X-ray images for better object classification and threat detection. The fusion step is based on the wavelet transform. Fused images generally reveal more detail information; however, background noise often gets amplified during the fusion process. This paper applies a backgroundsubtraction- based noise reduction technique which is very efficient in removing background noise from fused X-ray images. The de-noised image is then processed using a new enhancement technique to reconstruct the final image. The final image not only contains complementary information from both source images, but is also background-noise-free and contrastenhanced, therefore easier to segment automatically or be interpreted by screeners, thus reducing the false alarm rate in X-ray luggage inspection.

关键词： Noise reduction X-ray imaging Inspection Background noise Security Image processing Fuses Object detection X-ray detection X-ray detectors

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Drive circuit for a mode conversion rotary ultrasonic motor

Drive circuit for a mode conversion rotary ultrasonic motor

引用

Annual Conference of Industrial Electronics Society

作者： J. Xu E. Grant A.I. Kingon J.M. Wilson P.D. Franzon Center for Robotics and Intelligent Machines Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

A mode conversion rotary ultrasonic motor (USM) has potential applications in miniature robotics. However, its electrical drive circuit presents some unique challenges, particularly in producing a high frequency (/spl sim/40 kHz), high voltage (/spl sim/200 V peak-to-peak) signal into a low impedance (/spl sim/100 /spl Omega/) capacitive motor, while achieving high efficiency. This paper describes the design of such a drive circuit, intended for use with a 12 V battery. The drive circuit consists of a switch-mode power converter driving the USM via a step-up planar transformer. Compensation and resonant elements are added to improve the power efficiency. While the peak efficiency of this circuit is 45%, in practice the equivalent impedance of the USM changes with mechanical load and temperature, resulting in an average efficiency of 16%. The admittance vs. frequency characteristic and the equivalent electrical model for a USM prototype are also presented in this paper. The circuit simulations and loaded testing of a full-bridge DC-AC resonant converter with DC-offset module were performed. A load-adapted frequency tracking method has also been proposed to improve the efficiency and stability of the drive circuit.

关键词： Frequency Impedance Resonance Circuit testing Robots Voltage Batteries Switching circuits Switching converters Temperature

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Kinematics Modeling of a Wheel-Based Pole Climbing Robot (UT-PCR)

Kinematics Modeling of a Wheel-Based Pole Climbing Robot (UT...

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： A. Baghani M.N. Ahmadabadi A. Harati Robotics and AI Lab Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

This paper is concerned with the derivation of the kinematics model of the University of Tehran-Pole Climbing Robot (UT-PCR). As the first step, an appropriate set of coordinates is selected and used to describe the state of the robot. Nonholonomic constraints imposed by the wheels are then expressed as a set of differential equations. By describing these equations in terms of the state of the robot an underactuated driftless nonlinear control system with affine inputs that governs the motion of the robot is derived. A set of experimental results are also given to show the capability of the UT-PCR in climbing a stepped pole.

关键词： Climbing robots Wheels Mobile robots Robot kinematics Road transportation intelligent robots Inspection Cleaning Artificial intelligence Stability

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Wall following and obstacle avoidance results from a multi-DSP sonar ring on a mobile robot

Wall following and obstacle avoidance results from a multi-D...

引用

IEEE International Conference on Mechatronics and Automation

作者： S. Fazli L. Kleeman ARC Centre for Perceptive and Intelligent Machines in Complex Environments Intelligent Robotics Research Centre Department of Electrical and Computer Systems Engineering Monash University VIC Australia

Sensing capabilities of a multi-DSP sonar ring are demonstrated with wall following and obstacle avoidance behaviour. The autonomous mobile robot called "Sombrero" moves perpendicular to the nearest object on the left while controlling the distance to that object and generates high quality sonar maps. The wall following and obstacle avoidance behaviour is very simple due to the accurate and timely range and bearing (incidence angle) information provided by the advanced sonar ring. The advanced sonar ring consists of 48 ultrasonic transducers, 24 acting as transceivers and 24 acting as receivers, seven custom designed DSP echo processor boards and six analogue boards. The sonar ring is able to cover 360 degrees around robot with simultaneously firing of all 24 transmitters. Transmission and echo analysis are performed at repetition rates of about 10 Hz, for ranges up to six metres. Accurate distance and bearing measurements of objects are performed by the DSP system using matched filtering techniques. The robot is able to follow walls of various shapes such as a square, circle, concave corner and convex corner. Sombrero controls its motion based on the range and bearing data captured from the advanced sonar ring every 100 msec while moving with a constant speed. Experimental results illustrate the effectiveness of the sonar ring and the quality of the generated local maps.

关键词： Mobile robots Digital signal processing Sonar measurements Ultrasonic transducers Transceivers Process design Transmitters Performance analysis Performance evaluation Matched filters

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An intelligent circuit analysis module to analyze student queries in the universal virtual laboratory

An intelligent circuit analysis module to analyze student qu...

引用

Frontiers in Education (FIE) Conference

作者： A. Mahalingam B.P. Butz M. Duarte Intelligent Systems Application center Electrical and Computer Engineering Department Temple University Philadelphia PA USA

This paper presents an intelligent circuit analysis module that is capable of analyzing electrical circuits and determining equivalence. We discuss the module in context of a National Science Foundation funded project - universal virtual laboratory (UVL). UVL is a virtual electrical engineering laboratory for able and disabled individuals to construct, simulate and understand the characteristics of basic electrical circuits. This paper discusses the development of an intelligent circuit analysis module called the circuit recognizer (CR). The CR is a program that has knowledge of circuit theory concepts, and is capable of using this knowledge to provide assistance to a student while he/she is performing the experiments in UVL. While verifying circuit configuration it identifies errors and provides explanations that guide the student to a better understanding of the experiment. The ultimate objective of the CR is to evaluate the effectiveness of the teaching strategies employed within the UVL as well as to enhance the learning abilities of students

关键词： Circuit analysis Laboratories Chromium Instruments Circuit analysis computing intelligent systems electrical engineering Circuit simulation Circuit theory Oscilloscopes

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The maximum flow algorithm applied to the placement and distributed steady-state control of UPFCs

The maximum flow algorithm applied to the placement and dist...

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Annual North-American Power Symposium

作者： A. Armbruster M. Gosnell B. McMillin M. Crow Department of Computer Science Intelligent Systems Center University of Missouri-Rolla Rolla MO USA Department of Electrical and Computer Engineering Intelligent Systems Center University of Missouri-Rolla Rolla MO USA

The bulk power system is one of the largest man-made networks and its size makes control an extremely difficult task. This paper presents a method to control a power network using UPFCs set to levels determined by a maximum flow (max-flow) algorithm. The graph-theory-based max-flow is applied to the power system for UPFC placement and scheduling. A distributed version of max-flow is described to coordinate the actions of the UPFCs distributed in a power network. Two sample power systems were tested using max-flow for UPFC placement and settings. The resulting system characteristics are examined over all single-line contingencies and the appropriateness of the maximum flow algorithm for power flow control is discussed.

关键词： Steady-state Distributed control Control systems Power systems Communication system control Power transmission lines Power system control Load flow Size control Power system interconnection

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