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A Hidden Markov Models Tool for Estimating the Deterioration Level of a Power Transformer

A Hidden Markov Models Tool for Estimating the Deterioration...

引用

12th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2007), vol.2

作者： F. Sotiropoulos P. Alefragis E. Housos Computer Systems Laboratory Department of Electrical & Computer Engineering University of Patras Patras Greece

In electrical power systems, asset management procedures have developed into a central element of network operations and planning. Hidden Markov Models (HMM) can be used to transform various data collected from substation equipment into failure probabilities. Based on these failure probabilities a mathematical decision tool can be created which could be used in system-level simulation and experimentation. In particular, collected data utilizing the dissolved gas analysis-in-oil (DGA) field methodology for transformers are analyzed with HMM for the prediction of their deterioration level.

关键词： Asset Management Hidden Markov Models Maintenance Substation Component Reliability HMM

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Sensor Enabled Rule Based Alarm System for the Agricultural Industry

Sensor Enabled Rule Based Alarm System for the Agricultural ...

引用

12th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2007), vol.2

作者： Christos Gogos Panayiotis Alefragis Efthymios Housos Computer Systems Laboratory Department of Electrical & Computer Engineering University of Patras Patras Greece

This paper describes a system that generates intelligent alarms using sensor data located at various geographical locations. Users are informed using a rule enabled engine whenever certain conditions demanding attention occur, through an SMS messaging system. The user can easily define, through a graphical user interface, new rules or update existing ones. An agricultural case study of the system is presented.

关键词： Sensors SMS Alarms Rule engine XML Microclimate

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Conjugate Gradient Projection Approach for MIMO Gaussian Broadcast Channels

Conjugate Gradient Projection Approach for MIMO Gaussian Bro...

引用

IEEE International Symposium on Information Theory

作者： Jia Liu Y. Thomas Hou Sastry Kompella Hanif D. Sherali Department of Electrical and Computer Engineering Virginia Tech Blacksburg VA USA Information Technology Division U.S. Naval Research Laboratory Washington DC USA Department of Industrial and Systems Engineering Virginia Tech Blacksburg VA

ISBN: (纸本)9781424413973

Researchers have recently shown that the dirty-paper coding (DPC) is the optimal transmission strategy for multiple-input multiple-output Gaussian broadcast channels (MIMO BC). Moreover, by the channel duality, the nonconvex MIMO BC sum rate problem can be transformed to the convex dual MIMO multiple-access channel (MIMO MAC) problem with a sum power constraint. In this paper, we design an efficient algorithm based on conjugate gradient projection (CGP) to solve the MIMO BC maximum sum rate problem. Our proposed CGP algorithm solves the dual sum power MAC problem by utilizing the powerful concept of Hessian conjugate. We also develop a rigorous algorithm to solve the projection problem. We show that CGP enjoys provable convergence, scalability, and efficiency for large MIMO BC systems.

关键词： MIMO Broadcasting Algorithm design and analysis Convergence Scalability Iterative algorithms Switches Broadcast technology Information technology Laboratories

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Dynamic Modeling of Wind Farms with Fixed-Speed Wind Turbine Generators

Dynamic Modeling of Wind Farms with Fixed-Speed Wind Turbine...

引用

2007 IEEE Power engineering Society General Meeting (PES 2007), vol.10

作者： Wei Qiao Ronald G. Harley Ganesh K. Venayagamoorthy Intelligent Power Infrastructure Consortium (IPIC) School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA University of KwaZulu-Natal Durban South Africa Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla Rolla MO USA

A wind farm typically consists of a large number of individual wind turbine generators (WTGs) connected by an internal electrical network. To study the impact of wind farms on the dynamics of the power system, an important issue is to develop appropriate wind farm models to represent the dynamics of many individual WTGs. This paper presents various dynamic models, including a detailed model and three reduced-order equivalent models, of wind farms with fixed-speed WTGs. These models are developed and compared by simulation studies in the PSCAD/EMTDC environment under different wind velocity and fluctuation conditions as well as gird fault conditions. Concluding remarks are provided on how to choose an appropriate wind farm model for power system dynamic and transient studies.

关键词： Detailed model Equivalent model Fixed-speed wind turbine Squirrel-cage induction generator Wind farm

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Motion camouflage in a stochastic setting

Motion camouflage in a stochastic setting

引用

Proceedings of the 46th IEEE Conference on Decision and Control, Pages 1383-1838

作者： K. S. Galloway E. W. Justh P. S. Krishnaprasad Institute for Systems Research and the Department of Electrical and Computer Engineering University of Maryland College Park MD USA Naval Research Laboratory Inc. Washington D.C. DC USA

ISBN: (纸本)9781424414970;1424414970

Recent work has formulated 2- and 3-dimensional models and steering control laws for motion camouflage, a stealthy pursuit strategy observed in nature. Here we extend the model to encompass the use of a high-gain pursuit law in the presence of sensor noise as well as in the case when the evader's steering is driven by a stochastic process, demonstrating (in the planar setting) that motion camouflage is still accessible (in the mean) in finite time. We also discuss a family of admissible stochastic evader controls, laying out the groundwork for a future game-theoretic study of optimal evasion strategies.

关键词： mimicry (behavior) Camouflage Markov chain Stochastic solidification laying out

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Nonlinear Stabilization via Control-Lyapunov Measure

Nonlinear Stabilization via Control-Lyapunov Measure

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 5511-5970

作者： Umesh Vaidya Prashant G. Mehta Uday V. Shanbhag Department of Electrical & Computer Engineering Iowa State University Ames IA USA Coordinated Science Laboratory and the Department of Mechanical Science & Engineering University of Illinois Urbana IL USA Department of Industrial & Enterprise Systems Engineering University of Illinois Urbana-Champaign Urbana IL USA

ISBN: (纸本)9781424414970;1424414970

This paper is concerned with computational methods for Lyapunov-based control design of an attractor set of a nonlinear dynamical system. Based upon a stochastic representation of deterministic dynamics, a Lyapunov measure is used for these purposes. This paper poses and solves the co-design problem of jointly obtaining the control Lyapunov measure and a controller. The computational framework is based upon a set-oriented numerical approach. Using this approach, the co-design problem leads to a finite number of linear inequalities whose solutions define the feasible set of stabilizing controllers. We provide a proof of existence for a stochastic version of such a controller while the deterministic restriction is posed as the solution of a related integer programming problem. Mathematical programming techniques may be employed to obtain such controllers. Finally, an example is provided to illustrate the ideas.

关键词： Controllers Nonlinear dynamical systems design problems Co-design computational methods Attractor design control Solutions Proof Linear Inequality deterministic Stochastic

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Electromechanical and plasma resonances in two-dimensional electron systems with mechanically floating gates

Electromechanical and plasma resonances in two-dimensional e...

引用

2007亚洲光电子会议THZ光子学分会场

作者： M. Ryzhii V. Ryzhii I. Hagiwara M. S. Shur Computer Solid State Physics Laboratory University of Aizu Aizu-Wakamatsu 965-8580 Japan Department of Mechanical Sciences and Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy 12180 U.S.A.

We study plasma effects in a micromachined high-electron mobility transistor （HEMT） with the microcantilever （MC） serving as the gate using the developed model. The model accounts for mechanical motion of the MC and spatio-temporal variations （plasma effects） of the two-dimensional electron gas （2DEG） system in the transistor channel. The MC mechanical motion is described in the point-mass approximation. The hydrodynamic electron transport model is used to describe distributed electron plasma phenomena in the 2DEG system. Using the developed model, we calculated the response function characterizing the amplitude microcantilever oscillations and the output electric signal as functions of the signal frequency and the bias voltage for the devices with different parameters. We find the voltage dependences of the frequency of the mechanical resonance and its damping. In particular, it is demonstrated that the amplitudes of the mechanical oscillations and output electric signal exhibit pronounced maxima at the bias voltages close to the voltage of the 2DEG channel depletion followed by a steep drop with further increase in the bias voltage. We also consider a concept of a resonant detector of modulated terahertz radiation based on a micromachined HEMT. This device can exhibit both the plasma （in terahertz range） and mechanical （in megahertz or gigahertz range） resonances.

关键词： 2DEG microcantilever HEMT plasma resonance terahertz detector

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Eikonomia-An Integrated Semantically Aware Tool for Description and Retrieval of Byzantine Art Information

Eikonomia-An Integrated Semantically Aware Tool for Descript...

引用

International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Konstantinos N. Vavliakis Andreas L. Symeonidis Georgios T. Karagiannis Pericles A. Mitkas Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Intelligent Systems and Software Engineering Laboratory Informatics and Telematics Institute CERTH Thessaloniki Greece Sacred Convent of the Annunciation ORMYLIA Art Diagnosis Centre Chalkidiki Greece

ISBN: (纸本)9780769530154;076953015X

Semantic annotation and querying is currently applied on a number of versatile disciplines, providing the added-value of such an approach and, consequently the need for more elaborate - either case-specific or generic - tools. In this context, we have developed Eikonomia: an integrated semantically-aware tool for the description and retrieval of Byzantine artwork Information. Following the needs of the ORMYLIA Art Diagnosis Center for adding semantics to their legacy data, an ontology describing Byzantine artwork based on CIDOC-CRM, along with the interfaces for synchronization to and from the existing RDBMS have been implemented. This ontology has been linked to a reasoning tool, while a dynamic interface for the automated creation of semantic queries in SPARQL was developed. Finally, all the appropriate interfaces were instantiated, in order to allow easy ontology manipulation, query results projection and restrictions creation.

关键词： Information retrieval Art Ontologies Cultural differences Data mining Artificial intelligence Documentation Relational databases Intelligent systems Software engineering

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MEMS ROTARY ACTUATOR USING AN INTEGRATED BALL BEARING AND AIR TURBINE

MEMS ROTARY ACTUATOR USING AN INTEGRATED BALL BEARING AND AI...

引用

TRANSDUCERS 2007 - 2007 International Solid-State Sensors, Actuators and Microsystems Conference, Volume 3 of 5

作者： C. M. Waits N. R. Jankowski B. Geil R. Ghodssi US Army Research Laboratory Adelphi MD USA MEMS Sensors and Actuators Lab (MSAL) Department of Electrical and Computer Engineering Institute for Systems Research (ISR) University of Maryland College Park MD USA

The first silicon air-driven rotary actuation mechanism based on encapsulated ball bearings is reported. The method of integrating a silicon air turbine with a ball bearing support mechanism has been developed for silicon turbomachinery and tribological investigations. Rotational speeds up to 37,000 rpm and continuous operation longer than 24 hours were measured. Qualitative analysis is also presented, shedding light on silicon/ball wear and methods for increasing bearing lifetime and speeds.

关键词： Microball Bearings Microturbine MEMS Tribology

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Novel Architecture for Reconfigurable Optical Add-Drop Multiplexer Using Single Arrayed Waveguide Grating

Novel Architecture for Reconfigurable Optical Add-Drop Multi...

引用

The Joint International Conference on Optical Internet and Next Generation Network (COIN-NGNCON)

作者： Kwanil Lee Sang Bae Lee Sil-Gu Mun Chang Hee Lee Phonics Research Laboratory Intelligent Systems Division Korea Institute of Science and Technology Seoul South Korea Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

A novel optical add-drop multiplexer using arrayed waveguide grating is proposed for optical transport networks. By use of circulators in the coupled fold-back paths between demultiplexed channels, we improve the loss... 详细信息

关键词： Arrayed waveguide gratings Optical arrays Optical waveguides Optical add-drop multiplexers Optical crosstalk Optical signal processing Optical films Optical filters Circulators Wavelength division multiplexing

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