By Topic

Date 7-9 March 1995

Filter Results

Displaying Results 1 - 25 of 73
  • Proceedings of Southcon '95

    Save to Project icon | Request Permissions | PDF file iconPDF (163 KB)  
    Freely Available from IEEE
  • An intelligent power supply conditioning system using an embedded microcontroller

    Page(s): 100 - 105
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    Uninterruptible power supplies present a method to quickly detect a loss of power and replace the defective power source before any damage or corruption occurs. Using an inverter circuit to generate a square wave for a DC source can supply a crude approximation of an AC wave form. Obviously, the harmonic content is high and voltage regulation and current limiting are essentially non-existent. The microcontroller brings complex timing functions to the design equation. Also, the microcontroller can dynamically adjust the wave forms for both voltage and current regulation. Because of the speed of the microcontroller and its ability to determine when errant conditions on the incoming power line occur, a UPS can be constructed that can switch reliable, temporary power onto the electrical load before any devastating effects occur View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An optimal order structure for 2-D digital filters

    Page(s): 24 - 28
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    The model approximation as well as implementation of 2D recursive separable-in-denominator (RSD) digital filters with fixed-point arithmetic are investigated. A minimum-order structure is proposed based on the optimality condition of an error criteria due to both approximation and implementation. In order to reduce the number of multiplications for an optimal order realization, a class of second-order structures is proposed. This class of realizations presents a good compromise between low round-off noise, order reduction, number of multipliers and hardware complexity View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Toward an integrated curriculum of systems, controls, and machinery

    Page(s): 236 - 239
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB)  

    Development and the continuing trend in the global economy, increasing competition, and the information industry have changed the skill requirements of a competitive work force. Consequently, engineering students must be aware of contemporary practice in a much broader sense. Specifically, students who desire to pursue their career in the control related areas such as manufacturing and automation must have a strong multidisciplinary background in theory, design, devices, and instrumentation. The paper presents issues and concerns regarding the changes needed in order to face the challenge. This paper also describes efforts in curriculum and laboratory development in the areas of systems, controls, and machinery at the University of Central Florida View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rechargeable zinc air batteries market and technology overview

    Page(s): 30 - 36
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    AER Energy Resources is an Atlanta based technology company that has developed a rechargeable zinc air battery system. The primary advantage of the AER Energy Advanced Technology Battery is that its energy density on a weight basis is three times that of nickel cadmium, nickel metal hydride and lead acid batteries, and fifty percent higher than lithium ion batteries. This new battery technology can enable full featured portable computers with 10-20 hours of run-time with little or no increase in system weight. Portable computers with ten hours of run-time that incorporate large active matrix color screens, CD ROM players, faster processors or cellular communication capabilities will be possible. AER Energy is currently supplying evaluation batteries to interested OEMs. The following aspects of the battery are discussed: electrochemistry, air manager, electrical components, discharge characteristics, and charge characteristics View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Square spiral microstrip antennas: analysis for different sizes and substrate parameters using a personal computer

    Page(s): 362 - 367
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (516 KB)  

    It is demonstrated that the design of a square spiral microstrip antenna can be specified with only 4 parameters. Some details of a method of moments analysis technique are presented. Two test cases are presented to compare the performance of square spiral microstrip antennas of different winding densities. Either design could be advantageous depending upon the application. Finally, it is shown that such computations are within the reach of PCs View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power electronics education: courses and laboratory

    Page(s): 240 - 245
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    This paper presents a detailed description of the undergraduate and graduate education in the field of power electronics. Suggested power electronics undergraduate and graduate curriculum along with key course contents are presented. An outline for the simulation and hardware laboratory as a supporting facility for effective power electronics education is also addressed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improved lead-acid battery management techniques

    Page(s): 41 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    The consumer and industrial markets are experiencing unprecedented demand for battery management technology. Consumer appetite for the convenience of battery-powered portable equipment such as cellular phones and small form-factor computers is continuing to expand. The industrial market is being besieged by governmental regulations and consumer concerns on environmental pollution. This has increased development emphasis on electric motor-driven tools and vehicles. The secondary-battery industry is under competitive pressure to produce a cell that weighs almost nothing, takes up little space, and has ideal charge/discharge performance. Secondary battery technologies including lead-acid are being challenged to meet the lighter weight, smaller size, and higher performance requirements of these emerging market opportunities. Specifically, lead-acid battery technology is being improved by several innovative techniques that are well published. The battery charging and battery management techniques must keep pace with these improvements and meet or exceed consumer expectations. This paper describes some techniques that enhance the charging and battery management methods available for lead acid batteries. These include voltage rate termination, battery conditioning, and auto-cycle charge algorithms View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Feedback congestion controller for ATM networks using a neural network traffic predictor

    Page(s): 398 - 402
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    One of the fundamental challenges facing broadband information transport is to determine congestion control strategies to support multiple classes of traffic in the asynchronous transfer mode (ATM) based networks. Monitoring the buffer status is the most commonly used mechanism to detect congestions in ATM networks. However, in static feedback controllers defining the threshold of the buffer for congestion is not so direct and the degree of source rates to be regulated is not so clear, either. In this paper, we propose an explicit congestion mechanism for ATM networks using an artificial neural network to predict the traffic arrival patterns. The predicted data rate in conjunction with the current queue information of the buffer is used to generate a value that will inform the source to reduce its transmission rate. The results of a simulation study are presented which suggest that our mechanism provides a simple and effective traffic management for ATM networks. Cell loss due to congestion shows a 5 to 10 times improvement compared with the static approach. Transmission delay of our ANN controller is also smaller View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fractal compression of image sequences

    Page(s): 199 - 204
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (548 KB)  

    The paper proposes a hybrid image compression scheme which combines the resolution advantage of fractal image compression and the computational simplicity of motion vector compensation method. By experimenting on video conference image sequences, the block sizes and quantization are optimized, and performance factors are evaluated. With such images, the scheme can provide a compression ratio up to 70 while retaining excellent picture quality View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Traffic types, protocols, and system performance in wireless networks

    Page(s): 217 - 223
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (236 KB)  

    In the portable and mobile information age, the services delivered to the user will be primarily determined by the user. The radio and wireless network technologies used to deliver these services should enable them, not limit them. Thus, it is necessary to understand the demands of wireless products, applications, and services from a top-down, layered point of view. The objective of the paper is to discuss how to usefully model the performance of wireless applications and their protocols without having to construct models so detailed in a layer by layer sense as to be impractical View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Physical properties of low temperature solders and die attach materials

    Page(s): 340 - 344
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    The properties at the temperature range of -55°C to 180°C of several common solders used in electronic packaging are analyzed for mechanical properties (elastic modulus, yield point, ultimate tensile strength (UTS), and creep) and physical properties (microstructure and thermal expansion coefficient). Numerous experimental methods are utilized and correlated. The finite element method is used to model thermal stresses (thermal fatigue) induced by the mismatched coefficient of thermal expansion using all the results obtained in this work. Some preliminary data are presented together with previous data obtained in our laboratories for the Au-Sn eutectic alloy View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Educational activities of the IEEE

    Page(s): 246 - 248
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    A strategic objective of the Educational Activities Board (EAB) of the IEEE is the reshaping of educational programs to help members prepare for careers and employment in a rapidly changing technical arena. The Educational Activities Board works with IEEE Sections to promote an awareness of the available educational resources and in planning educational programs. The IEEE encourages the involvement of its members with their student branches, pre-college programs and in explaining the role of the engineer in the community. In addition to numerous technical conferences hosted by the IEEE at the national and international levels, many technical books and periodicals are available to keep members abreast with the latest advances in electrical engineering research. The IEEE has a collection of video tapes on technical topics, publishes the IEEE Standards and provides multi-media self study courses. This presentation will cover the educational activities mentioned above. In addition, specific activities of the Education Chapter of the IEEE Orlando Section will be presented View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Implementation of 2-D separable-in-denominator digital filters for real-time processing

    Page(s): 7 - 11
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    The general decomposition of separable in denominator 2-D discrete systems is reported. Several novel realizations for separable-in-denominator 2-D digital filters are presented. The number of required multipliers and additions for the implementation of these structures are reduced in comparison with the previously reported structures. The proposed realizations possess high degrees of parallelism/modularity which are suitable for VLSI design and implementation View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Topical overview of soft-switching PWM high frequency converters

    Page(s): 47 - 52
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (580 KB)  

    A topical overview of the field of soft-switching PWM DC-DC converters is presented. Over sixty papers published in the 1993-4 have been reviewed and categorized according to the various resonant techniques, control schemes, application requirements or devices used. Also covered are the zero-current and zero-voltage-transition techniques which are at the forefront of research View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A slotted counter rotating metropolitan area ring network

    Page(s): 268 - 272
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB)  

    In this paper, we propose and analyze a new architecture for metropolitan area networks (MANs). The architecture is based on ring topology and is called counter rotating slotted ring (CRSR). The proposed MAN (CRSR) has a dual-ring architecture and consists of two unidirectional transmission media that are shared among all network users. The information is transmitted by using fixed size slots. The flow of information in two rings is in the opposite direction. As each user is connected to both the rings, each user has two possible routes to send the information to a desired destination. The evaluation of CRSR under various conditions is also presented in this paper. Simulation and analytical modeling are used for evaluating the proposed MAN architecture. The results show that CRSR provides better performance in comparison with other similar MANs View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Negative feedback control design for a PWM-buck converter

    Page(s): 60 - 67
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB)  

    This paper uses a conventional pulse width modulator (PWM) control method to design a negative feedback controller for the PWM-buck converter. The main objective in using the conventional control is to design a stable compensator in the closed loop to provide stability and improve the performance for the power supply for the parameter variations, load changes, and the equivalent series resistance (ESR) effects. This is done by adding a compensator in the feedback loop of the switching power supply. The performance of the PWM-buck converter is improved. The simulation program PSPICE is used to verify the theoretical analysis of the converter View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital fault simulation and test development using JESIM

    Page(s): 106 - 110
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    Too often the efforts of digital IC design verification and test are left until after the design has been completed. Sometimes these efforts are not dedicated until after the silicon has been fabricated. The cost, performance, functionality, speed and reliability of the chip are greatly impacted by the lack of proper requirement and preparation for test. This paper discusses the usefulness of the Digital Event and Test simulator “JESIM” for design verification, fault simulation, test vector generation and design for testability View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Intelligent peripheral modules for microcontrollers

    Page(s): 90 - 99
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB)  

    The modular concept of microcontroller design provides the means whereby each module can have it's own local microengine or state machine. The main CPU communicates with the modules through dual access memory, issuing commands to semi-intelligent state machines or writing directly to registers in the module. Once a module has been given a command sequence, the peripheral can act autonomously from the CPU. With several modules working at the same time, the effect of running multiple instructions per clock cycle can be obtained. In other words, a timer module can be performing some task while the CPU is executing an unrelated algorithm View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Designing an electric vehicle conversion

    Page(s): 303 - 308
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    National efforts to improve air quality in heavily populated urban communities-by reducing vehicular tailpipe emissions-have rekindled interest in the development of electric vehicle technology and infrastructure. Electric vehicles make ideal urban-commuter vehicles, for driving to and from, and within a city. However, electric vehicles are currently manufactured only in low volumes, and consequently the price of most commercially available electric vehicles remains high. It is possible, however, to build, an electric vehicle by “converting” a gasoline-powered vehicle, that is, replacing the internal combustion engine in an existing gasoline powered vehicle with an electric drive-train. This process is called “electric vehicle conversion”, and has become popular among hobbyists, schools, and clean-air enthusiasts, as a means of providing an immediate solution to clean-air transportation. Many of the commercial electric vehicles sold in the USA are electric vehicle conversions. This paper addresses the design considerations involved in the conversion of a gasoline-powered vehicle to electric. Discussion of the various design elements in an electric vehicle conversion include: removal of internal combustion engine and related parts, choice of electric vehicle components, installation of electric vehicle components, and integration of electric vehicle accessory systems. For practical purposes, this paper limits consideration of EV components available at a cost that reflects high-volume production View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multimedia implementation on Ethernet

    Page(s): 205 - 209
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    The objective is to implement multimedia communications on the existing Ethernet networks. The main problem with transmission of voice and video (synchronous data) on the Ethernet protocol is that Ethernet is a packet network protocol with unpredictable delays-which makes it difficult to send data at fixed intervals. The paper presents a method to transfer voice and video over Ethernet networks with reasonable quality View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new dual-bus metropolitan area communication network

    Page(s): 224 - 229
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    Describes and analyzes a new architecture for metropolitan area networks (MANs). The architecture is based on a slotted unidirectional dual bus structure and is called dual bus R-net. A master station for each bus generates transmission frames that consist of a reservation slot and various information slots. The information slots are reserved by stations using the reservation slot before they can be used for transmission of information. Evaluation of dual bus R-net, using simulation, indicates that its performance is better than that of other similar MANs, in terms of channel utilization, bounded delay, and fair access etc View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Defense conversion and public transit operations

    Page(s): 346 - 351
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    Via the Technology Reinvestment Program, an existing military integrated position location and communication system based on networked spread spectrum radios is being adapted to satisfy safety critical, operational requirements for train location and control in railroad and transit applications. Radios, installed on-board trains, at wayside locations, and at control stations, participate in a synchronous, time slotted network enabling position location determination in conjunction with reliable transfer of control information View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Pipes and types: options for delivering broadband services to residential subscribers

    Page(s): 250 - 254
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (444 KB)  

    As the era of multimedia applications arrives, the daunting challenge of actually delivering broadband services to residential subscribers must be met. Several technologically feasible solutions to this problem have been proposed including the use of copper, fiber, and hybrid fiber/coax transmission systems. The paper explores both the advantages and disadvantages of the technological and real-world aspects offered by each of these technologies. Conclusions and recommendations of technologies which are best-suited for real-world deployment are made based on the issues discussed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Full text access may be available. Click article title to sign in or learn about subscription options.