Electrical and Computer Engineering Commons^™

Algorithme D’Elaboration D’Un Reseau Electrique A Gestion Optimale D’Ecoulement Des Puissances, Tarek Mesbah

Boukhemis Chetate

Un des baromètres (indicateurs du niveau d’évolution ) de développement d’un pays, est sa consommation en énergie électrique ; dont tout industrie et mode de vie des résidents en dépend. Partant sur ce point capital nous avons organisé la thèse afin de gérer le parc énergétique national d’une manière rationnelle. Cette étude peut servir dans la compréhension et l’analyse approfondie de l’état de la stabilité de notre réseau électrique, qui a montré sa fragilité après l’incident vécu le 03/02/2003, qui a prouvé l’urgence de prendre en charge toutes les insuffisances enregistrées pour éviter que cet incident se reproduise. La thèse …

Agricultural Applications For Electromagnetic Exposure, H. Aliakbarian, A. Enayati, Hossein Ameri Mahabadi, M. Ashayer Soltani

Hossein Ameri Mahabadi

Despite the advances in bug controlling and antifreezing operations of agricultural products, the devastation of Sunne pests and freezing is still enormous. Traditional treatments such as chemical insecticides for bug controlling and covering to avoid freezing have not been sufficient. In the presented paper, new ideas of using electromagnetic treatment for anti-freezing operation, pre-harvest Sunne pest control, and Orchid flower control are introduced.

A Novel Method Of Detecting Missing Parallel/Multiple Bond-Wires In Microwave Transistors That Is Amenable To Integration With Automated Test Handlers, Chin-Leong Lim

Chin-Leong Lim

A method of detecting a missing parallel-connected bond-wires in packaged microwave transistors is described. Instead of the conventional way of testing the transistor in the amplifier configuration, the new method tests the device as an oscillator. Using the oscillation frequency as the screening criterion reduces test complexity and allows easy integration with existing automated test handlers

Trends In Uspto Office Actions, Ron D. Katznelson

Ron D. Katznelson

No abstract provided.

0.5w High Linearity Power Amplifier For Broadband Wireless (3.3 ~ 3.9 Ghz), Chin-Leong Lim

Chin-Leong Lim

This paper presents a 0.5 Watt amplifier that operates over the 3.3 ~ 3.9 GHz range. The target applications are pre-driver in base-stations and power amplifier in subscriber units. The design marries good Third Order Output Intercept Point (OIP3) and exceptional Power Added Efficiency (PAE) at IdB gain compression point (PldB). The performances are: -G = 11.8 dB, IRL & ORL < -8 dB, PldB = 28.5 dBm and OIP3 = 42.6 dBm. The superior performance is achieved through the use of Avago Technologies' proprietary 0.25um GaAs Enhancement mode pHEMT process. The device requires simple matching components to achieve wide bandwidth because of the built-in input pre-match. From the reliability standpoint, pHEMT devices are eminently suited to PA use -the drain to source resistance (RDSon) will inherently rise to counteract the thermal runaway that blights bipolar and HBT PAs. The internal bias circuit is temperature compensated and can be adjusted for either class A or class AB operation. The device is housed inside a standard 16 pin LPCC 3X3 package.

Direct Torque Control Of Five-Phase Permanent Magnet Synchronous Machine, Mukhtar Ahmad

Mukhtar Ahmad

Permanent magnet synchronous machines are becoming attractive in many industrial applications due to their high torque to inertia ratio, higher efficiency , and power density . Interest in Multi-phase motor drives has considerably increased during last few years. The main applications of multi-phase machines are in electric traction, electric vehicles, and hybrid vehicles. Multi-phase motor drives have many advantages including higher reliability and power density, and lower torque pulsations at higher frequencies

Influence Of Overvoltages In Induction Motors Fed By Pwm Voltage Inverters On Power Efficiency, Boukhemis Chetate, Mohammed Tahar Belassel, Rachid Beguenane, Stéphane Simard

Boukhemis Chetate

No abstract provided.

Electric Power: Cyber And Electromagnetic Security Issues, George H. Baker

George H Baker

Electric power is essential to the functioning of U.S. society. The electric power system increasingly operates at or near its reliability limits. The geographic scale of the tightly coupled networks involved makes the system susceptible to large-scale outages. More frequent natural and accidental failures portend possible catastrophes from intentional disruption. Deregulation has been a major factor to the lack of investment in system upgrades. Techniques to prevent attacks and reduce vulnerabilities are available and affordable.

Localisation Of Production Placement And Reduction Of Energy Transfer, Tarak Mesbah, Kamel Bounaya, Boukhemis Chetate

Boukhemis Chetate

The first step in the planning of the electrical supply networks consists in defining the optimum placement of one or more power stations; this can be done by the centre of gravity method, or by the minimal reduced costs. The first method take in account only the optimisation of investments, tended that the second in addition to the investments holds operating statement "production cost, cooling and transport." In this study, we show also the strategy and the criteria of delimitation of the zones to electrify by the same departure and to reduce the transfer of power between zones, which has …

Cognitive Radio: Fundamentals And Opportunities, Robert H. Morelos-Zaragoza

Robert Henry Morelos-Zaragoza

This talk is aimed at MSEE students in San Jose State University. It provides an overview of cognitive radio concepts and technologies. A MATLAB Simulink of demonstration of digital channel selection using a low IF radio architecture is presented. Technical challenges that remain to be solved in this area are identified.

Wireless Valuables Monitoring Device, With Proximity Sensing And Automatic Arming And Disarming, Hani Mehrpouyan, Christopher Mitchell, Matthew T. Brown

Hani Mehrpouyan

The invention relates to apparatus and methods for detecting when an object is disturbed and generating an alarm in response thereto. The invention has general application to protecting valuables. Some embodiments of the invention are applied to protect laptop computers or other portable electronic devices.

Implementation Of A Mems Laboratory Course With Modular, Multidisciplinary Team Projects, John Lee, Stacy H. Gleixner, Tai-Ran Hsu, David W. Parent

David W. Parent

This paper presents the implementation and outcomes of a hands-on laboratory course in microelectromechanical systems (MEMS), co-developed by a multidisciplinary team of faculty from mechanical engineering, electrical engineering, and materials engineering. Central to the design of the course is an emphasis on implementing modules that are able to overcome critical barriers related to (1) diverse academic background from different majors and (2) practical limitations in microfabrication facilities. These points are vital for promoting MEMS education, because they expand the student pool and reach audiences that need a cost-effective way to support instructional laboratory experiences in MEMS without the broader infrastructure …

Engineering: Beyond Ears In Pre-College Years, Uchechukwu O. Ofoegbu, Ananth N. Iyer, John Helferty, Joseph Fischgrund

Ananth N Iyer

A 12-week program was developed in which electrical engineering concepts, in form of robotics projects, are taught to students at a secondary educational institution for the deaf and hearing impaired. The robotics course was originally designed for, and has been taught for about a decade to freshmen at the Temple University college of Engineering. The objectives of this project range from eliminating existing boundaries of engineering education to increasing the anticipation of success amongst the physically impaired. A prior breakthrough in the extension of engineering education beyond assumed “limits” was achieved when a young man who was both sight and …

Evaluating Software Engineering Processes In Commercial And Community Open Source Projects, Tony Wasserman, Eugenio Capra

Tony Wasserman

We describe a current study for obtaining information about management of commercial and community open source projects. We have interviewed and surveyed leaders of more than 75 open source projects. Questions focused on the styles of leadership and communication, with a technical focus on testing and quality assurance processes. This paper describes the methods used to identify and contact subjects, as well as the questions posed and some results.

Designing Resource-Bounded Reasoners Using Bayesian Networks: System Health Monitoring And Diagnosis, Ole J. Mengshoel

Ole J Mengshoel

In this work we are concerned with the conceptual design of large-scale diagnostic and health management systems that use Bayesian networks. While they are potentially powerful, improperly designed Bayesian networks can result in too high memory requirements or too long inference times, to they point where they may not be acceptable for real-time diagnosis and health management in resource-bounded systems such as NASA’s aerospace vehicles. We investigate the clique tree clustering approach to Bayesian network inference, where increasing the size and connectivity of a Bayesian network typically also increases clique tree size. This paper combines techniques for analytically characterizing clique …

Continuous Improvement In Engineering Education Through Effective Value For Money Audits, Razimah Abdullah, Rozeha A Rashid, Mazlina Esa, Sadruddin Mohd Saidfudin

Razimah Abdullah

Elaboration D’Un Système Intelligent De Diagnostic Et De Surveillance En Temps Réel Des Moteurs À Induction, Djalal Eddine Khodja

Boukhemis Chetate

No abstract provided.

Development Of Measuring And Computer Interface System For An Industrial Electrostatic Precipitator, Omar H. Abdalla, Soliman M. Sharaf, Hazem F. Feshara

Omar H. Abdalla

The paper describes the design and practical implementation of a measuring and digital computer interface system for an electrostatic precipitator (ESP) filter used in a large cement factory. The objective is to develop a digital computer control system to replace an old analog controller for the ESP filter mounted on a cement production rotary kiln inside the National Cement Company. The main concern is to develop a modern technology for a real ESP controller designed and implemented locally in Egypt. The first phase of this research project is described in this paper. The computer interface system is developed to facilitate …

Emp: A National-Scale Threat To The U.S. Infrastructure, George H. Baker

George H Baker

Since the nuclear weapon atmospheric test days of the 1950s, it has been known that a single nuclear weapon detonated at altitudes from about 30-500 kilometers generates a strong electromagnetic pulse (EMP) that can disrupt electronic systems on the ground at large distances. During the Cold War, the effects of high altitude nuclear detonations were considered by many to be ephemeral, second order effects in comparison to direct blast/thermal/radiation effects from near-surface bursts in the context of mutually-assured-destruction (or MAD) scenarios. However, as infrastructure objectives have gained prominence in military operations, the likelihood of high altitude nuclear scenarios have gained …

Derivation And Application Of A Conserved Orbital Energy For The Inverted Pendulum Bipedal Walking Model, Jerry E. Pratt, Sergey V. Drakunov

Sergey V. Drakunov

Speaker Recognition In Adverse Conditions, Ananth N. Iyer, Uchechukwu O. Ofoegbu, Robert E. Yantorno, Stanley J. Wenndt

Ananth N Iyer

Recognizing speakers from their voices is a challenging area of research with several practical applications. Presently speaker verification (SV) systems achieve a high level of accuracy under ideal conditions such as, when there is ample data to build speaker models and when speaker verification is performed in the presence of little or no interference. In general, these systems assume that the features extracted from the data follow a particular parametric probability density function (pdf), i.e., Gaussian or a mixture of Gaussians; where a form of the pdf is imposed on the speech data rather than determining the underlying structure of …

Unsupervised Indexing Of Noisy Conversations With Short Speaker Utterances, Uchechukwu O. Ofoegbu, Ananth N. Iyer, Robert E. Yantorno, Stanley J. Wenndt

Ananth N Iyer

Two speaker indexing system for conversations are presented in this paper. The first method involves indexing two-speaker conversations. In this method, two reference models are judiciously chosen from the conversation such that they represent the two different speakers. Models are then matched to the reference speakers using distance-based comparisons. The second technique is based on first determining the number of participants in the conversation using a speaker count method termed the “Residual Ratio Algorithm” (RRA), and then indexing based on this count. The RRA involves an elimination process in which speech segments matching a chosen set of reference models are …

Ut-Scope: Speech Under Lombard Effect And Cognitive Stress, Ayako Ikeno, Vaishnavi Varadarajan, Sanjay A. Patil, John Hl Hansen

Sanjay A. Patil

This paper presents UT-scope data base, and automatic and perceptual an evaluation of Lombard speech in in-set speaker recognition.

New Technique Of One And Simultaneous Two Open-Switches Fault Automation Detection And Location In Two Level Three Voltage Inverter, Tarak Benslimane, Boukhemis Chetate

Boukhemis Chetate

No abstract provided.

Amélioration Des Performances D’Un Variateur De Vitesse Contrôlé Par La Méthode À Flux Orienté, Aissa Kheldoun

Boukhemis Chetate

The present work is an attempt to improve the efficiency and the robustness of vector controlled induction motor drives. In fact, the efficiency of these latter, decrease for two main raisons: rotor resistance variation and light load operating; if the flux level is maintained constant. For this reason, a method is suggested to select the optimal flux which leads to minimum power loss. In another hand, to address the effect of the rotor resistance variation, a fuzzy logic-based mechanism is proposed to maintain the decoupling and avoiding consequently extra power loss. The last part of this thesis is dedicated to …

Tackle Wideband Rf Switching With Pin Diodes, Chin-Leong Lim

Chin-Leong Lim

PIN diodes make cheaper, faster and more reliable RF switches than the mechanical competition. The two methods of constructing PIN diodes, bulk and epitaxial, result in significantly different bias current, linearity and lower frequency limit. This paper compares the wideband series switching performances of a bulk PIN diode (w = 22.5 um, Tau = 300 ns) and an epitaxial diode (w = 6.5 um, Tau = 180 ns) in similar low-cost, miniature SOD-323 packages. Through simulation and experiment, we detected significant differences in insertion loss, isolation, and third-order intercept (IP3) performances between the two diode types. In conclusion, the design …

Speech Under Stress: Analysis, Modeling And Recognition, Sanjay A. Patil, John Hl Hansen

Sanjay A. Patil

In this chatpter, we consider a range of issues associated with analysis, modeling, and recognition of speech under stress.

Blackouts In Electric Power Transmission Systems, Ioannis Karamitsos, Konstadinos Orfanidis

John P. Karamitsos

No abstract provided.

Very High Bit Rate Digital Subscriber Line (Vdsl2) Technology For Triple Play Services, Ioannis Karamitsos, Athanassios Mavroidis

John P. Karamitsos

No abstract provided.

Contrôle D’Une Éolienne En Fonctionnement Autonome Basée Sur Une Génératrice Asynchrone, Djamila Rekioua Pr

REKIOUA Djamila Dr

Cet article présente le contrôle de la tension à la sortie d’une génératrice asynchrone excitée par un onduleur/redresseur à ML1 relié à un condensateur du côté continu du convertisseur pour une utilisation dans les régions éloignées et isolées. Elle est contrôlée en utilisant la commande vectorielle à flux rotorique orienté lorsque la vitesse du rotor et la charge électrique sont variables