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Industrial Electronics Society, 2001. IECON '01. The 27th Annual Conference of the IEEE

Date Nov. 29 2001-Dec. 2 2001

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  • IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243)

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  • Component-based software development

    Page(s): 1834 - 1837 vol.3
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    Component-based software development (CBSD) strives to achieve a set of pre-built, standardized software components available to fit a specific architectural style for some application domain; the application is then assembled using these components. Component-based software reusability will be at the forefront of software development technology in the next few years. This paper describes a software life cycle that supports component-based development under an object-oriented framework. Development time versus software life cycle phases, which is an important assessment of the component-based development model put forward, is also mentioned. View full abstract»

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  • Author index

    Page(s): 2208 - 2216
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  • Retention of engineering and technology undergraduates

    Page(s): 1754 - 1757 vol.3
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    The issue of undergraduate retention is not a new one, it has been debated since the turn of the last century. Nevertheless, the issue has been receiving increased attention and has become more pressing. This work focuses on the academic aspects of attrition and retention, which could be divided loosely into those which are intrinsically within the domains of institutions and educators and those which should be acted upon by the students themselves. Here, the emphasis is on the actions of institutions and educators. Topics discussed include student recruitment approaches, curriculum structures, academic environment, accreditation requirements, perceived quality of education, and motivation as they influence attrition. The objective is to reflect on potential sources of problems and possible remedies to help enhance retention and increase the possibilities of success of all students without compromising quality of education View full abstract»

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  • CORBA and Web technologies applied to long distance learning

    Page(s): 2131 - 2134 vol.3
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    Recent growth in the Word Wide Web (WWW), Java and distributed object oriented technologies (e.g. CORBA) has received significant attention as means to provide a distributed infrastructure for computing and sharing of sophisticated and expensive laboratory equipment in computer engineering courses. This paper presents a CORBA-based toolkit integrated with the Web to allow the monitoring and experiment of a digital pendulum system in a class laboratory or with other educational institutions. A simple and easy-to-use Web graphical user interface (GUI) was developed to help students in the use of default control algorithms during lab experiences View full abstract»

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  • Sampling period in discrete time acceleration control

    Page(s): 1722 - 1727 vol.3
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    In this paper, the authors investigate relations between the acceleration controller gain and the stability or vibrational response of a speed control system with acceleration control loop in a discrete time. The stability or vibrational response of the system is besides acceleration controller's gain also related to the speed controller's gain, sampling period, and bandwidth of acceleration sensor. The gain limit of acceleration controller becomes lower if the sampling frequency is low, when the bandwidth of acceleration sensor is high, or the gain of a speed controller is high. The results, analysis, and experimental results are shown in this paper View full abstract»

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  • Achieving power efficiency through minimum cycle time in digital signal processor design

    Page(s): 1880 - 1885 vol.3
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    Fast microprocessors exploit instruction level parallelism and high clock frequency. On the other hand, power dissipation is reduced by lowering the supply voltage and consequently increasing the clock cycle time. This paper presents a DSP architecture which targets a simple, low-cost and ultra-high frequency implementation, showing that this choice leads to high power efficiency in terms of dissipation with constrained performance. The design reduces the cycle time by a combination of instruction set as well as microarchitecture design choices. The architecture performance is extensively evaluated by means of instruction level simulation of standard DSP benchmarks and cycle time estimation. A theoretical analysis of the power efficiency is also provided View full abstract»

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  • Design of adjustable speed switched reluctance motor drives

    Page(s): 1577 - 1582 vol.3
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    Switched reluctance motors (SRM) have attracted considerable attention in industry over the past few years. Unique capabilities such as robustness, ease of closed loop control, low cost manufacturing, etc. are among the determining factors for this renewed interest. Today, SRM drives are among the main players for important automotive applications such as electrically assisted power steering, integrated starter alternators, and pumps. The same trend is observed in other sectors of industry such as home appliances, aerospace and heavy-duty mining equipment to name a few. The ongoing worldwide research and development on various aspects of SRM drives has resulted in substantial advancements. At Electro Standards Laboratories (ESL), we have developed a broad variety of innovative solutions for this emerging technology. This includes advanced magnetic design and novel configurations, self-tuning and adaptive control to enhance efficiency, specific control solutions to mitigate torque pulsation and radial vibration, and position sensorless control over the entire speed range. The goal of this article is to underline fundamentals of design for various parts of SRM drives namely machine, inverter and control View full abstract»

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  • A predictive control scheme for DC voltage and AC current in grid-connected photovoltaic inverters with minimum DC link capacitance

    Page(s): 1994 - 1999 vol.3
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    This paper describes a discrete time control algorithm for regulation of both DC voltage and AC currents in three-phase inverters. It is suitable for application in grid-connected photovoltaic (PV) generation plants due to the intrinsic ability to perform maximum power point tracking (MPPT) of the PV array. Furthermore, the transient response time is of the order of a few PWM sampling periods, therefore the energy storage requirements of the DC capacitor are significantly reduced, and a small nonelectrolytic type can be employed. Considering that the DC buffer capacitor of an inverter is often the limiting factor in terms of reliability, the proposed approach can lead to a substantial improvement in the way the entire system is perceived. The technique has similar harmonic performance to regularly sampled PWM, with a fixed switching frequency and low current distortion, and operates at unity power factor. This predictive method avoids problems of stability and loop interactions present in controllers employing cascaded DC voltage and AC current feedback loops. The theory of the algorithm is presented in this paper, together with simulation results View full abstract»

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  • Vision based lateral control by yaw rate feedback

    Page(s): 2135 - 2138 vol.3
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    In an autonomous vehicle, the reference lane is continually detected by a machine vision system. The vehicle is steered to follow the reference yaw rates which are generated by the deviations of lateral distance and the yaw angle between the vehicle and the reference lane. To cope with the steering delay and the side-slip of vehicle, a PI controller is introduced for the yaw rate feedback. It is tuned by the simulation in which the vehicle is modeled as 2 DOF and 79 DOF and is verified by the results of an actual vehicle test. The lateral control algorithm by yaw rate feedback has good performances of lane tracking and passenger comfort View full abstract»

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  • Variable structure control for electrohydraulic position servo system

    Page(s): 2194 - 2198 vol.3
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    In this paper, variable structure control (VSC) with reaching law is presented for an electro hydraulic position servo control system to achieve accurate servo tracking in the presence of load disturbance and plant parameter variation. The proposed control technique achieves a zero steady-state error for step input and has a good dynamic transient and no chattering in the control input. The performance of the controlled servo system has been evaluated through digital simulation by varying the inertia of the motor and the load disturbance View full abstract»

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  • Network-based control systems: a tutorial

    Page(s): 1593 - 1602 vol.3
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    There are two general structures to design a control system through a network. The first structure is to have several subsystems, in which each of the subsystem contains a set of sensors, a set of actuators, and a controller by itself. These system components are attached to the same control plant. In this case, a subsystem controller receives a set point from the central controller. Another structure is to connect a set of sensors and a set of actuators to a network directly. Sensors and actuators in this case are attached to a plant, while a controller is separated from the plant via a network connection to perform a closed-loop control over the network. A challenging problem in control of networked-based system is network delay effects. The time to read a sensor measurement and to send a control signal to an actuator through the network depends on network characteristics such as their topologies, routing schemes, etc. Therefore, the overall performance of a network-based control system can be significantly affected by network delays. The severity of the delay problem is aggravated when data loss occurs during a transmission. Moreover, the delays do not only degrade the performance of a network-based control system, but also can destabilize the system. This tutorial presents fundamental details of network-based control and recent network-based control techniques for handling the network delays. The techniques are based on various concepts such as state augmentation, queuing and probability theory, nonlinear control and perturbation theory, and scheduling. A general structure of a network-based control system, delay types, and delay behaviors are also described in this tutorial. In addition, advantages and disadvantages of these techniques are discussed View full abstract»

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  • Designing fuzzy logic controllers for DC servomotors supported by fuzzy logic control development environment

    Page(s): 2093 - 2098 vol.3
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    The design of advanced controllers for many industrial processes is heavily dependent on the availability of a model for the process. Construction of appropriate models is often not possible due to the complexity and nonlinearity of the process. Fuzzy logic can be used for different tasks within intelligent control systems because they represent general, nonlinear relationships that can be initialized using expert knowledge. In adaptive control the key problem is system identification and fuzzy logic is used as process identification and acts as an on-line adaptive part of the control system. The presented work in this paper devoted to the development and the implementation of a smooth and robust fuzzy logic based PID controller targeting a real process represented by a DC servomotor. The aim is to overcome the need for an on-line tuning problem associated with the parameters of classical PID approach and enhances the performance. The adopted self-tuning strategy improves the performance automatically until it converges to a predetermined optimal global criterion. The experimental results and the performance of a developed fuzzy logic controller is compared with other methods such as, model reference adaptive controller and other fuzzy logic based controllers using the same process in terms of steady state error, settling time, and response time. The developed controller shows better performance View full abstract»

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  • Replacement of components in public key infrastructures

    Page(s): 2012 - 2016 vol.3
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    Public key infrastructures play an important role in secure electronic communication via the internet. Governments, companies and customers use this technology to a high degree and trust in the provided security, but public key infrastructures have risks. On the one hand it is not proven that the mathematical problems on the hardness of which public key cryptography depends are really hard to solve. On the other hand failures in implementations are not out of the question. Since most of the modern public key infrastructures support only one signature algorithm, breaking it would hurt authenticity and integrity of, as well as confidence in, transmitted data and therefore effect the breakdown of the entire infrastructure. Such a breakdown would imply costly consequences for business and society. In this article we present a public key infrastructure which can, in case of the breaking of an algorithm, be repaired with a new cryptosystem, and thus conserve its functionality View full abstract»

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  • A low-energy compact electron beam irradiator for core-loss reduction of silicon steel

    Page(s): 2117 - 2120 vol.3
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    A new compact, low-energy electron beam irradiator has been developed. The core loss of silicon steels can be reduced by the magnetic-domain refinement method. The irradiator was developed for the application of core-loss reduction using the method. The beam energy of the irradiator can be varied from 35 to 80 keV and the maximum current is 3 mA. The irradiation area is designed to be 30×30 mm2 now and will be upgraded to 30×150 mm2 using a scanning magnet and scanning cone. The electron beam generated from 3 mm diameter LaB6 is extracted to the air for the irradiation of the silicon steels in the air. A special irradiation port was developed for this low-energy irradiator. A havar foil with 4.08 μm thickness were used for the window and a cold air-cooling system keeps the foil structure by removing heat at the window. The irradiator system and its operation characteristics are discussed View full abstract»

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  • Specification in a large industry consortium-the MOST approach

    Page(s): 1828 - 1833 vol.3
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    The MOST Cooperation (media-oriented systems transport) is an industry group of automotive and supplier companies that specifies interfaces of multimedia components. Many members are competitors: they collaborate on standards while preserving their competitive advantages. Moreover, development processes differ for each member, but the MOST standard must be concise and consistent. We develop an XML based architecture to support individual workflows and the specification process as a whole View full abstract»

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  • A scalable web-based real-time information distribution service for industrial applications

    Page(s): 1810 - 1815 vol.3
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    In this paper we discuss a web-based content distribution service for wide-area distributed embedded systems to allow remote monitoring of their state using web browsers, servers, and caches. The service allows browsing the real-time state of remote devices, industrial processes, controllers, appliances, agents, and other entities that may publish their state. For a remote monitoring application, it creates the illusion that all monitored entities are available locally in real-time, as opposed to scattered across a wide-area network with unpredictable backbone delays. The main difficulty is to achieve this in a scalable manner without wide-area network support for real-time communication while simultaneously reducing the amount of backbone traffic (which carries process state updates). Another challenge is to achieve this without significant modifications to the existing web infrastructure. We provide timely response and bounded consistency for the monitored data. We have built a prototypical service architecture based on freely available web servers/proxy caches and shown its basic applicability to industrial applications by the experimental results View full abstract»

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  • Resonant AC link system converter for fuel cell grid interface

    Page(s): 1953 - 1958 vol.3
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    The transition from the present fossil fuel based economy to a self-sufficiency clean energy world depends upon distinctive power electronic systems for the implementation of alternative energy grid interface. Fuel cell technology is an attractive means of power generation because it is environmentally clean, uses the vast resource of hydrogen as fuel and approximately doubles the current cycle efficiency of fossil fuel power generation. This paper discusses the proposal of a high frequency series resonant AC link operating under discrete pulse modulation for interfacing a fuel cell to the grid. Analysis and simulations studies are presented, showing the advantages of creating zero-current-switching conditions which enable the use of thyristors and related technologies View full abstract»

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  • VLSI implementation of cross-coupled MOS resistor circuits

    Page(s): 1886 - 1891 vol.3
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    This paper presents the cross-coupled MOS resistor circuits. The circuits consist of two internal pairs of NMOS and PMOS transistors, and their critical, width and length parameters regulate the drain current, transconductance, and output drain resistance. Consequently it determines the output resistance of the circuits. The cross-coupled MOS resistor circuits can be used in multiplication circuits and internal filter designs View full abstract»

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  • GMDH-based modeling and compensation for nonlinear friction in table drive systems

    Page(s): 1716 - 1721 vol.3
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    This paper presents a novel mathematical model-based compensator design for the nonlinear friction in table drive systems using Group Method of Data Handling (GMDH). In the proposed approach, the nonlinear friction can be autonomously modeled as a polynomial expression for appropriate control state variables according to the process of GMDH and, as a result, the complicated structural modeling and its parameterization, indispensable to conventional model-based strategies, can be completely eliminated. In addition, since the proposed GMDH-based model can achieve the generalization ability for table drive conditions, the robust compensation for friction can be attained against the change of drive conditions. Experimental results using a table drive system of actual machine tools show the significant performance improvement of the proposed algorithm in the trajectory control with velocity reversal motion View full abstract»

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  • Sensorless control of an interior permanent magnet synchronous motor on the rotating coordinate using an extended electromotive force

    Page(s): 1667 - 1672 vol.3
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    Permanent magnet synchronous motors have been widely used in industrial applications for their high efficiency. To control permanent magnet synchronous motors, knowledge of rotor position and velocity is necessary. However, position sensors are expensive and mechanically bulky. Although many sensorless control methods have been proposed, but these schemes used approximations for simplification of the mathematical model, which may lead to unstable problems at certain conditions. To solve this problem, the sensorless control based on an extended electromotive force model has been proposed in this paper. The proposed method has been verified by experiments View full abstract»

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  • Speech coding using Fourier-Bessel expansion of speech signals

    Page(s): 2199 - 2203 vol.3
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    Coding of speech signals using Bessel functions as orthogonal signals in the Fourier-Bessel (FB) expansion has been explored. It has been found that a reasonable quality of speech can be reconstructed using a set of 15 to 30 coefficients in the FB expansion of each frame of speech. At 80 frames per second and eight bits per coefficient, this corresponds to a bit rate of as low as 9600 bits/second when predetermined sequence of coefficients are used. The speech quality and the bit rate increase when higher number or a selected set of coefficients are used. Comparable results in perceptual speech quality and frame-to-frame signal-to-noise were observed for both male and female speakers View full abstract»

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  • Hardware and software considerations for implementing hardware-in-the loop traffic simulation

    Page(s): 1915 - 1919 vol.3
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    Digital computer simulation provides an important tool for the study of complex systems. When the complexity of the problem is too large to warrant an analytical solution, simulation is the only option to analyze system configurations or operational modes prior to their implementation in the field. Not all components in a complex system can be modelled in adequate detail in computer simulations: for example, only simple, generic models of traffic controllers are available. Real-time hardware-in-the-loop simulation allows real traffic controllers to interact with computer simulations to improve accuracy. This paper provides an overview of real-time simulation and then discusses hardware and software constraints to implementing a controller interface device (the NIATT CID II) for real-time hardware-in-the-loop simulation View full abstract»

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  • Towards the attack signatures' comparison in survivable computer networks

    Page(s): 2017 - 2021 vol.3
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    Survivability architecture and run-time attack detection can be successfully implemented based on attack signatures. In this paper, the authors concentrate on profile signatures based on Markov models. They are represented by the frequency spectrum of the functionalities in the system. The difference between safe system signatures from attacked (monitored) system signatures indicates possible intrusion. This paper proposes an approach, based on soft computing techniques, for recognizing that difference View full abstract»

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  • Laboratory measurements on magnetic water treatment device

    Page(s): 2190 - 2193 vol.3
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    A short review of magnetic water treatment (MWT) devices with permanent magnets is given. In the paper, the authors present a model of electromagnetic devices with AC electrical input from 40 to 110 W and radial symmetric water flow from 10 to 400 L/min. Electromagnetic properties of the laboratory model EM I are presented and MWT efficiency is discussed. Comparison for the radial magnetic field of a solenoid in air and a solenoid in the device shows that for the used material with magnetization properties, the geometrical construction of tested MWT model is not the best. The next step will be the minimization of the magnetic resistance through the water flow by optimization of the housing geometry View full abstract»

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