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Issue 1, Volume 7,
January 2008
Title of the Paper: Performance
Analysis of Direct Digital Synthesizer Architecture with Amplitude Sequencing
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Authors: I.
Jivet, B.Dragoi
Abstract: The paper presents an analysis of a novel DDS architecture based on
direct amplitude algorithmic generation in its capacity to generate pure and
high frequency signals. The algorithm implementation requires very few
resources and is linear in digital precision length. In its simplest form
includes one compare, two additions and several increments per iteration
step. A solution to compensate the known major drawback of the algorithm,
sample phase non uniformity in time, is presented. The versatility of direct
digital synthesizers in frequency switching and phase modulation applications
is shown to be preserved in the new architecture. The paper also presents an
analysis of the potential of the proposed architecture performance as
reflected in the low harmonic spectrum of the quadrature output signals. A
FPGA implementation of the architecture was synthesized and simulated using a
VHDL description to validate the solution as proposed. Synthesis reports are
compared with other FPGA direct frequency synthesizer implementations as
reported in recent literature.
Keywords: amplitude
centered DDS architecture, generated sine/cosine spectrum, FPGA
implementation
Title of the Paper: FPGA Implementation
of the Curve Generator Algorithm for H/W Acceleration Applications
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Authors: I.
Jivet, B.Dragoi
Abstract: The paper presents results of the implementation of a nonparametric
curve generator algorithm in FPGA as a test of concept for H/W acceleration
solutions. It is shown that coordinate sequences as a curve representation
when generated by the algorithm form a nonuniform sampled cosine/sine
sequences of values that can be used in signal generation applications. A
known draw back of the algorithm is the phase non uniformity of the samples.
The paper presents solutions to fix the non uniformity by sample time delay
compensation. A time sequence compensated extension of the algorithm is
presented for use in digital sine and cosine signal generation applications.
The VHDL description of the extended algorithm as proposed was simulated and
synthesized in a Xilinx family FPGA showing low gate count. Finally the paper
explores a second extension of the algorithm for random value trigonometric
function computation. The performance results are compared with recent known
coordinate transform solutions implemented in FPGA using the CORDIC algorithm
as reported in literature.
Keywords: H/W
acceleration, Jordan's
curve generator algorithm, FPGA implementation, CORDIC algorithm.
Title of the Paper: Complex Chaotic
Dynamics of the Double-Bell Attractor
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Authors: M.S. Papadopoulou, I.M.
Kyprianidis, and I.N. Stouboulos
Abstract: In this paper a novel non-autonomous 4th order chaotic oscillator
was investigated. This oscillator consists of a nonlinear resistance RN and a
negative conductance Gn. We have studied the dynamics of the circuit for
various values of the input sinusoidal signal vs(t) in the low frequency
area, both theoretically and experimentally. We have demonstrated the birth
and catastrophe of the Double-Bell strange attractor for different
frequencies values, as the amplitude Vo of the input signal varies. This work
is a precursor of future investigation of circuit’s application in secure communication
systems.
Keywords: Driven circuit,
Double-Bell attractor, Chaos, Spectrum analysis, Secure communication.
Title of the Paper: Simulation Result
about Harmonics Filtering using Measurement of Some Electrical Items in
Electrical Installation on UHP EAF
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Authors: Manuela Panoiu, Caius Panoiu,
Mihaela Osaci, Ionel Muscalagiu
Abstract: This paper present the results obtained by simulation for the functioning
regime improvement of an UHP Electric Arc Furnace. Because the nonlinearity
of the electric arc the EAF functioning regime are perturbed from three
causes: the current harmonics, the reactive power and the unbalanced load. In
this paper there are study the possibilities of harmonics filtering and
compensate the reactive power. The study was made using the results of some
measurements made on an EAF and using an electric arc model for simulation.
The simulations are performed in PSCAD EMTDC simulation program, a program
dedicated to the power system.
Keywords: PSCAD-EMTDC
simulation program, electric arc modeling, harmonics mitigation, filtering,
reactive power compensation
Title of the Paper: About Stability of
Mechatronic Systems Driven by Asynchronous Motors
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Authors: Monica Adela Enache, Sorin
Enache, Mircea Dobriceanu
Abstract: This paper presents two methods for stability analysis of mechatronic
systems driven by asynchronous motors: an analytical method and a numerical
one, original, conceived by authors. The presentation is accompanied by
simulations and experimental results leading to credible conclusions.
Keywords: stability,
mechatronic system, asynchronous motor, parameters, simulation, Matlab,
experiment.
Title of the Paper: A System for Video
Conversion and Text Data Overlay
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Authors: Rafic Bachnak, Ramya
Chakinarapu, Mario Garcia, Dulal Kar
Abstract: This paper describes the design and development of a Video
Conversion and Data Overlay (VCDO) prototype that takes in an analog National
Television System Committee (NTSC) video signal generated by a video camera
and data acquired by a microcontroller and display them in realtime on a
digital panel. An 8051 microcontroller is used to acquire power dissipation
by the display panel, room temperature, and camera zoom level. The paper
describes the major hardware components and shows how they are interfaced
into a functional prototype. Test data results are presented and discussed.
Keywords: Overlaying Text
Over Video, Data Conversion, Real-Time Video
Issue 2, Volume 7,
February 2008
Title of the Paper: Algebraic
Derivation of the Oscillation Condition of High–Q Quartz Crystal Oscillators
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Authors: Nicolas Ratier, Remi Brendel
Abstract: A symbolic–numeric method to simulate a high–Q quartz crystal
oscillator is derived in this paper. The proposed method can take into
account the isochronism defect of the resonator when high precision
simulations are needed. The oscillator circuit is expressed under a canonical
5–terminal network which can be easily handled. The oscillator behavior is
then described under the form of a nonlinear characteristic polynomial whose
coefficients are functions of the circuit components and of the oscillation
amplitude. The steady state oscillation amplitude and frequency are
determined by solving the polynomial in the frequency domain. Moreover, if
tolerance is assigned to each circuit component, efficient worst case
analysis can be performed.
Keywords: Quartz Crystal
Oscillator, Nonlinear, Simulation, Characteristic Polynomial, n–Terminal
Network
Title of the Paper: Research and
Implementation of A Novel DC High Voltage
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Authors: Zhao Yanlei
Abstract: The high voltage power supply is widely used in various fields. The
paper presents detailedly the topology, the operation and the key techniques of
a high precise direct current (DC) negative high voltage power supply. To
enhance the power factor of input side and the voltage precision of output
side, the power supply uses BOOST converter for power factor correction and
voltage regulation. It converts DC to high frequency (HF) alternating current
(AC) square wave with phase-shifted full bridge. The voltage of the AC square
wave is boosted by HF transformer, then the HF high voltage AC square wave is
double rectified to DC high voltage output. The HF high voltage transformer,
which is designed and manufactured with special material—polytetrafluoro
ethylene (F4) and special technique, solves several technical difficulties
including influence of distributing parameters and insulation, and meets
demands of high frequency, high voltage and high power. The supply’s output
voltage is 25kV and its maximal output current is 100mA.The experimental
result shows the power supply has high input power factor, stable output
voltage and small ripple.
Keywords: Power supply
high voltage Boost Transformer ZVS phase-shifted control
Title of the Paper: Ultrashort Pulse
Measurement Using High Sensitivity Two Photon Absorption Waveguide
Semiconductor
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Authors: Mohammad Ad Mehdi Karkhanehchi
Abstract: Two photon absorption in a reverse-biased pin AlGaAs optical
waveguide is observed. This waveguide was used as a combined nonlinear mixer
and detector of an autocorrelator for measuring the pulse width of 1.3μm
wavelength optical pulses. The autocorrelation trace gives the FWHM of a
1.3μm Q-switched semiconductor laser to be approximately 13 ps.
Keywords: Two photon
absorption, autocorrelator, semiconductor laser, Q-switching, optical
waveguide
Title of the Paper: Mathematical Models
of High-Speed Trains Movement
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Authors: Cismaru Cristian Daniel,
Nicola Doru Adrian, Manolea Gheorghe, Drighiciu Mircea Adrian and Bulucea
Cornelia Aida
Abstract: In the paper it is presented the mathematical model of the useful
movement of the high-speed trains. On the mathematical model basis it is
built the structural diagram associated of the useful movement. The obtained
structural scheme can be easily implemented in SIMULINK. An immediately
example of the utilization of the useful movement model it constitutes the
drawing of the movement diagrams, which it illustrates the dynamics aspect of
the useful movement. Like application, by means of the SIMULINK model they
are traced, on the basis of the traction and braking characteristics and of
the imposed conditions of the route, the movement diagram of the high-speed
train.
Keywords: modeling,
simulation, electric vehicle, high-speed train, useful movement
Title of the Paper: Design and
Implementation of Self-Calibration for Digital Predistortion of Power
Amplifiers
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Authors: Dua Idris, Yannick Le Moullec,
Patrick Eggers
Abstract: The linearization of Power Amplifiers (PAs) on mobile handsets is a
critical problem for stringent systems such as WiMAX. In this paper we
present the results of our investigation on the feasibility of
self-calibration from a theoretical point of view as well as on a FPGA-based
hardware platform for the predistortion of PAs. We propose a system design in
three phases i) self-calibration, ii) inverse function calculation and iii)
predistortion. MATLAB simulation results show that the functionality of the
self-calibration, inverse function calculation and predistortion can
linearize the PA characteristics and that the FPGA implementation results of
the self-calibration are promising, paving the way for an efficient
self-calibrating digital predistorter.
Keywords: DPD,
self-calibration, PA
Title of the Paper: Nonuniform Sampling
Delta Modulation - decoding problems
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Authors: Ryszard Golański, Jacek
Kołodziej
Abstract: The problems of reconstructing signals coded with use of adaptive
sampling delta modulation have been shown in the paper. Synchronization
procedure of the algorithm "with return to the basic sampling
instant" has been analyzed. Investigations of the bit error robustness
of the delta system with sampling adaptation have been presented. Special
interest was aimed at the behaviour of Non-uniform Sampling Delta Modulation
system with reference to the transmission errors. The phenomena of the
parasitic oscillation and dynamic regulation of the dc level in the
reconstructed signal, as a result of the channel errors, have been discussed.
Parasitic oscillation parameters have been analyzed. It has been found that
the algorithm "with return to the basic sampling instant" improves
the bit error robustness of the adaptive sampling delta modulation.
Keywords: Adaptive delta
modulation, Non-uniform sampling, Error compensation, Robustness, Parasitic
oscillation.
Issue 3, Volume 7,
March 2008
Title of the Paper: On Bifunctional
Polymorphic Gates Controlled by a Special Signal
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Authors: Richard Ruzicka
Abstract: Polymorphic digital circuits are circuits composed of polymorphic
(multifunctional) as well as ordinary gates. In addition to its standard
logic function (such as NAND), a polymorphic gate exhibits another logic
function which is activated under a specific condition, for example, when
Vdd, temperature, illumination or a special signal reaches a certain level.
This paper describes existing polymorphic gates and their features, benefits
and limits and discusses special class of polymorphic gates – bifunctional
polymorphic gates controlled by a special signal. These gates seem to be most
flexible polymorphic gates. In the paper a new two-input bifunctional gate
for polymorphic circuits is proposed. The gate produces NAND or XOR function
according to a special signal. The proposed gate is effective in terms of
area overhead – it consists of 9 transistors only, while corresponding
circuit employing conventional gates consists of more than 10 transistors.
Keywords: hardware
engineering, digital circuits, CMOS logic gates, polymorphic electronics,
VLSI, reconfigurable digital circuits
Title of the Paper: A Low Cost
CPLD-Based Ultrasonic Flowmeter
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Authors: Ioan Lie, Virgil Tiponuţ,
Ivan Bogdanov, Sabin Ionel, Cătălin Daniel Căleanu
Abstract: Based on the characteristics of ultrasonic non-contact measurement
and the combination of temperature measurement with ultrasonic flow
measurement, a flowmeter was designed. The structure of the ultrasonic
flowmeter and the circuits of temperature and flow measurement were
described. The design method of the meter with low power consumption was
given by selecting MSP430 single chip microcomputer. In order to enhance
flowmeter's precision and stability a Xilinx CoolRunner CPLD was applied in
high precision timing. The result is a low cost portable solution working
with a 3.3V supply and operating with ultrasonic transducers at 1MHz
frequency.
Keywords: ultrasonic
flowmeter, delay line, transit-time, CPLD, ultrasonic transducer
Title of the Paper: Dedicated hardware
for inheritance-oriented crossover operation
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Authors: Masaya Yoshikawa, Kentaro
Otsuka, Hidekazu Terai
Abstract: Traveling salesman problem is basic combinatorial optimization problem
of various practical applications in engineering. Genetic Algorithm (GA) is
one of algorithms to solve the traveling salesman problem efficiently. GA is
a powerful optimization algorithm, which is based on the mechanism of
biological evolution. However, an essential difficulty exits in GA with
regard to large amount of computation time, because GA is population-based
search algorithm. Reducing the computational time is the most important
priority, if GA is applied to practical problems. On the other hand, GA has
three genetic operations, and the crossover operation is one of the most
important genetic operations. In this paper, we propose novel hardware
architecture for crossover operation in order to reduce computation time
while keeping the search performance. The proposed architecture introduces a
new hardware-oriented crossover algorithm considering character inheritance.
Experiments prove that the proposed architecture achieves not only high speed
processing but also reduction of the number of processing steps, while
keeping the quality of solution.
Keywords: Hardware
architecture, Crossover engine, Traveling Salesman Problem, Character
inheritance, Genetic Algorithm, High speed processing
Title of the Paper: Dynamic Stability
Analysis Based on Energy-Passivity Considerations
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Authors: Chieh-Tsung Chi
Abstract: This study aims at researching the relations between the stability
characteristics of an ac contactor and the passivity conditions during power
disturbances such as voltage sag. Based on the basic definitions of energy
passivity, the stability performance of contactor can be determined by
employing the flux linkage versus coil current curve of contactor. On the
basis of the governing equations of ac contactor, a digital simulation model
is first established. The correctness of the contactor model is verified by
comparing the difference of the coil current and the armature displacement
between model and contactor. The dynamic stability of contactor can be
determined by the energy transferred direction in the electric part or the
polarity of the time rate of the change of coil inductance. There are three
types of voltage sag are respectively assumed to be the experimental case.
Finally, we found that the results which were obtained from simulation tests
agree well with those of the theoretical inferences. The identifying rules of
the stability of contactor during voltage sag are presented here is valuable
for the contactor designer to draft an effective compensation strategy in
future so as to improve the momentary performance of contactor.
Keywords: Dynamic
stability, contactor, passivity, energy, voltage sag, model
Title of the Paper: Current Or/And
Voltage-Mode Quadrature Oscillators With Grounded Capacitors And Resistors
Using FDCCIIs
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Authors: Jiun-Wei Horng, Chun-Li Hou,
Chun-Ming Chang, Shih-Ting Cheng And Hsin-Yu Su
Abstract: Two quadrature oscillator circuits each using one fully
differential second-generation current conveyor (FDCCII), two grounded
capacitors and two grounded resistors are presented. The current-mode
quadrature signals can be obtained from the first proposed circuit. The
current-mode and voltage-mode quadrature signals can be simultaneously
obtained from the second proposed circuit. In both proposed circuits, the
current-mode quadrature signals have the advantage of high output impedance.
The oscillation conditions and oscillation frequencies are orthogonal
controllable. The use of only grounded capacitors and resistors makes the
proposed circuits ideal for integrated circuit implementation. Simulation
results are included.
Keywords: Quadrature
oscillator, Current-mode, Voltage-mode, Current conveyor, FDCCII.
Title of the Paper: Efficient
Implementation and Performance Evaluation of the Second Order Volterra Filter
Based on the MMD Approximation
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Authors: Georgeta Budura, Corina Botoca
Abstract: Considered as a prototype of nonlinear system models the second
order Volterra filter (FV2) is characterized by an increased complexity in
comparison with a linear filter. This complexity is given by the large number
of filter coefficients, as well as by the filter operations and it requires
an increased computational power in technical applications. The filter based
on the multi memory decomposition (MMD) structure represents a good
approximation of the FV2 and significantly reduces the number of filter
operations. In this paper we propose an efficient implementation of the MMD
filter studied in a typical nonlinear identification problem. The simulations
show the very good performance of our proposed MMD structure in comparison
with the results obtained by using a second order LMS Volterra filter. We
have evaluated the performance of our method based on the system response to
different input signals.
Keywords: second order
Volterra filter, multi memory decomposition, efficient implementation,
performance evaluation
Title of the Paper: Reactive Power
Requirements of Grid Connected Induction Generator in a Weak Grid
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Authors: K. S. Sandhu and Shelly
Vadhera
Abstract: Induction generators are gaining the popularity due to its
simplicity and no synchronization problem. However the major drawback of this
machine is its additional reactive burden on the system, where it is
connected. In this paper an attempt is made to explore the performance of a
grid connected induction generator (GCIG) due to weak grid conditions i.e.
voltage and frequency fluctuations. Iterative model developed by the authors
is used to predict the reactive burden of the generator due to voltage and
frequency fluctuations. The comparison between experimental and simulated
results proves the validity of technique proposed. Further proposed modeling
is also used to include the effects of saturation.
Keywords: Grid connected
induction generator, Iterative technique, Magnetizing reactance, Saturation,
Weak grid
Issue 4, Volume 7,
April 2008
Title of the Paper: Current-Starved
Pseudo-Floating Gate Amplifier
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Authors: Mehdi Azadmehr and Yngvar Berg
Abstract: In this paper we present Current-Starved Pseudo-Floating Gate
(CSPFG) inverters with capacitive feedback. The analog CSPFG inverter
suppresses low frequencies due to the active, local feedback. This inverter
can be used in designing circuits and amplifiers where high frequency signal
processing is the main goal. One good area of use is in filter design where a
narrow band pass or reject filter is to be designed. Typical applications are
detection of high frequency components in sensor signals, i.e. airbag
sensors. AC simulation of the inverter is presented to show that the circuit
is suited for high performance filter design. Linearity simulations of the
analog CSPFG inverters shows the good transient properties suited for
amplifier design.
Keywords: Analog, CMOS,
Floating gate, Inverter, Amplifier, Filter.
Title of the Paper: Real-time Voltage
Control to Improve Automation and Quality in Power Distribution
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Authors: Francesco Muzi
Abstract: A new power digital voltage controller is described able to improve
quality in power distribution using real-time compensation of both slow
voltage changes and quick disturbances as sags and swells. Voltage control
was achieved by means of a special transformer able to change the magnetic
flux linked to the secondary winding; moreover, secondary voltage was
monitored through a feedback control managed by a properly programmed
micro-controller. The completely automated system includes a power section,
namely a special transformer, a power electronic section consisting of an
inverter driven by an actuator, and a digital section involving a
micro-controller with implemented software. The capabilities of the proposed
voltage conditioner were verified by laboratory experimental tests performed
on a specifically manufactured prototype. Experimental results are reported
and the behavior of the conditioner under different working conditions is
discussed.
Keywords: Electrical
distribution systems, Power quality, Power systems control and automation,
Voltage conditioning.
Title of the Paper: Reliability
Assessment and Improvement of Large Power Induction Motor Winding Insulation
Protection System Using Predictive Analysis
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Authors: Mahfoud Chafai, Larbi Refoufi
, Hamid Bentarzi
Abstract: The paper presents a reliability assessment of a widely used
protection system of large power squirrel cage induction motors. In conjunction
with published field induction motors Failure data this assessment effort is
based on a integrated predictive analysis using three methods: (1) a Fault
Tree Analysis (FTA) that allows to identify and then quantify the initiating
failure cause weighting factors; (2) an Event Tree Analysis (ETA) that allows
to predict the protection system probability outcomes following an external
disturbance and (3) a Failure Mode Effect and Criticality Analysis (FMECA)
that will help set the stage for developing a preventive maintenance program
fit to keep up the induction motor protection system reliability at the
required level with particular attention given to aggressive environmental
factors such as found in cement plants.
Keywords: FTA, ETA,
FMECA, Induction motors , Protection, Reliability , Failure Modes.
Title of the Paper: PWM encoding method
for wireless communication in sensor networks
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Authors: Ciprian Seiculescu, Ioan Lie,
Aurel Gontean
Abstract: When designing low power sensor with radio capabilities the choice
of the encoding for the radio signal can have great impact on performance and
implementation requirements. The paper presents different encodings with
their advantages and disadvantages, looking at both performance and
implementation requirements. Finally the paper presents a proposed PWM
encoding and the way that it was implemented and shows that the
implementation advantages over other more traditional encoding outweigh the
loss in performance. As well the paper presents different implementation
methods for transmitters and receivers using the PWM encoding.
Keywords: PWM, amplitude
modulation, Low power sensors networks, FPGA Prototyping, radio communication
Title of the Paper: Design and
Implementation of DC Motor Speed Controller Using Fuzzy-Adaptive Controllers
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Authors: Hengameh Kojooyan Jafari
Abstract: As adaptive control systems have parametric construction and high
accuracy against disturbances, and fuzzy control systems can compensate
deficiency of dynamic parameters in time [1], in this paper fuzzy–adaptive
controllers is used. Drive method is PWM and 8955 microcontroller is used for
DC motor speed controlling. Simulation studies has been performed by MATLAB
SIMULINK6.1 and SIDE51 (ver1.04R11) software by C language is used for
program of controller and its compiler is used for making hex file to program
8955 microcontroller by EPROM PROGRAMMER (PGM89)[6,7] . The DC motor is
VGFMED-BSMIB52 and driving IC is L298 IC.
Keywords: Fuzzy-adaptive
control, Microcontroller, DC motor .
Title of the Paper: Optimization
Frequency Design of Eddy Current Testing
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Authors: Narong Mungkung, Komkrit
Chomsuwan, Narong Pimpru and Toshifumi Yuji
Abstract: The purposes of this research were to construct the nondestructive
metal testing intrument by using eddy current method and to find an optimal
frequency for the metal testing intrument. The testing intrument consist of a
sine wave oscillator circuit which can adjust the frequency between 20 – 90
kHz, and a 50 ohms sensor circuit. There are three kinds of testing
intrument. The first was the nondestructive imperfection testing by using
eddy current method. The sample irons are constructed with different
imperfection on surface. The output signals of testing from the sensor
circuit are compared. The second was the nondestructive categorization metal
testing by using eddy current method. Many kinds of metals are taken to
testing. The last one was the nondestructive testing for finding the
thickness of films on iron by using eddy current method. In this testing the
thickness of films varied between 100 – 700 microns. In all testing,
differences of the signal testing were compared to analyze the optimal frequency
for the testing intrument. The results of research showed that the
nondestructive metal testing intrument by using eddy current method can be
used to find a different imperfective iron, categorize the metal and find
thickness of films. In addition, the range of an optimal frequency is 30 kHz
to 70 kHz for testing intrument.
Keywords: Nondestructive
, eddy current, thickness of films, optimal frequency
Title of the Paper: Behavioural
Modelling of On-Chip Optical Interconnect with Potential Applications for
Testing Linking-with-Light Circuits and Systems
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Authors: Hj Kadim
Abstract: An integrated circuit (IC) or a system where light beams displace wires
or metallic interconnects to pass signals between different subsystems
requires new test techniques. Based on a knowledge of light properties and
the transmitting medium, possible factors or parameters that may affect the
propagation of light and the consequent changes in the expected output can be
identified. Using these parameters as the ingredients, a mathematical model
is constructed to study the effect of parameter fluctuations on the on-chip
optical interconnect and hence providing information that will assist in
identifying abnormal deviations in circuit’s behaviour.
Keywords: Optical
interconnect, test, modelling, parameter fluctuations, SoC
Title of the Paper: Capacitive Sensing
Device in a Postural Control System
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Authors: Ivan Marinović, Duje
Čoko, Igor Zanchi
Abstract: This paper presents a theremin used as a sensing device which provides
a DC voltage output proportional to distance between the device and a human
body in standing position. This device consists of a pair of Butler’s oscillators, a heterodyning mixer,
a low-pass 4th order Butterworth filter and a frequency-to-voltage converter.
Output signal may be sent to another device such as an actuator or a
measurement module, depending on the application type. Three sets of
measurements for various types of sensing electrodes have been taken, and a
third degree polynomial function has been fitted using a least square method.
Keywords: human posture
identification, proximity sensing, theremin, Butler’s oscillator, posturography, least
square method, curve fitting
Title of the Paper: On-Line Dynamic
Cable Rating for Underground Cables based on DTS and FEM
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Authors: Y.C.Liang Y.M.Li
Abstract: The development of surface temperature on-line monitoring
techniques for 110kV and above XLPE power cable gives a strong support to
power cable load dynamic adjustment. However, the problem is how to determine
the conductor temperature from the surface temperature. A technique based on
distributed temperature sensing (DTS) and finite element method (FEM) is
presented to estimate the soil thermal properties by matching the computed
thermal fields to that obtained from measurement and predict the realtime
current carrying capacity by iterative method in order to prevent overheat of
insulation. Compare with the thermal circuit model, the method based on DTS
and FEM is more accuracy.
Keywords: Online
monitoring，Dynamic cable rating，Distributed temperature sensing， Finite element method, current
carrying capacity, Underground cables
Title of the Paper: A Numerical
Evaluation of Damages Caused by Asynchronous Motors to the Environment
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Authors: Francesco Muzi, Luigi
Passacantando
Abstract: In recent years a slow but progressive increase in the world’s
temperatures has been consistently recorded. To oppose this global warming
trend, two especially important actions are the monitoring and reduction of
greenhouse emissions, in large quantity caused by global electric energy
production. To this regard an algorithm is proposed to estimate the particles
released into the atmosphere as a consequence of the electric energy produced
for the operation of asynchronous motors, which in industrialized countries
absorb as much as 60 % of the total electric energy generated. The described
procedure can also help to evaluate the possibility to supply motors with
electric energy produced from renewable sources instead of from thermal power
plants supplying traditional public networks, which would of course reduce
the environmental impact of motors to almost zero. Emissions linked to
electric energy generation were evaluated on the basis of statistics
collected from the main electric utilities. The proposed algorithm was validated
by means of laboratory tests performed on a single asynchronous motor working
under different operating conditions.
Keywords: Electric motor
operation and consumption, Emissions and pollution, Environmental
sustainability.
Title of the Paper: Device and Memory
array Models for Flash EEPROM Technology
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Authors: Hassen Aziza and Bertrand
Delsuc
Abstract: In this paper, three EEPROM memory cell models are presented. The
first model is a compact model based on Mos Model 11 (MM11) and fully
validated on silicon. From this first model we propose two alternative models
(level 1 & level 2). These last models allow a reduction of simulation
time and memory space overheads, with respect of accuracy, compared to the
original compact model. The technique used to build the level 1 and level 2
models is based on the complexity reduction of the original EEPROM model. We
also present simulation time results using the different models within memory
arrays.
Keywords: EEPROM,
Modeling, Memory arrays, Simulation time.
Title of the Paper: Use of RBF Neural
Network in EMG Signal Noise Removal
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Authors: V.R. Mankar and Dr. A.A.
Ghatol
Abstract: The bioelectric potentials associated with muscle activity constitute
the electromyogram (EMG). EMG signal is used in biomedical applications to
detect abnormal muscle electrical activity that occur in many diseases and
conditions like muscular dystrophy, inflammation of muscles, pinched nerves,
peripheral nerve damages, amyotrophic lateral sclerosis, disc herniation,
myasthenia gravis and others. In this paper, it is depicted that an RBF
neural network as compared with other types of neural networks can be
effectively used for EMG signal noise removal, which is a typical nonlinear
multivariable regression problem. The performance parameters i.e. MSE and
correlation coefficient are found to be in the expected range of values.
Keywords: EMG, RBF, MSE, MLP, PE,
Correlation Coefficient, NN.
Title of the Paper: User Intention
based Personalized Search : HPS(Hierarchical Phrase Serch)
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Authors: GunWoo Park,
JinGi Chae, Dae Hee Lee and SangHoon Lee
Abstract: Personalized search has recently got significant attention in the
web search. Accordingly, user’s intention of search is very important
information to retrieval information in aspect of personalized Search.
Although many personalized search and strategies have been proposed, the
majority of web users are difficulty in retrieval information corresponding
their search intention. In this paper, we present personalized search based
on User Intention through the HPVM(Hierarchical Phrase Vector Model) to solve
these problems using and machine learning methodology. Users can navigate
through the prior user’s intention by their own needs. This is especially
useful for various meaning and poor queries. By analyzing the results, we
find out that there is an unique representation of user intention under
different queries, contexts and users. Furthermore, we can find out that this
knowledge is very important in improving personalized information retrieval
performance by filtering the results, recommending a new query, and distinguishing
user’s characteristics. With this approach, search engines can provide more
predictive information for Web searchers. Based on this approach, we
developed a personalized search engine, HPS (Hierarchical Phrase Search).
Keywords:
Personalization, Information retrieval, Hierarchical phrase search, Support
vector machine, Machine learning, Relevance feedback
Title of the Paper: An Efficient Error
Resilience Scheme based on Wyner-Ziv Coding for Region-of-Interest Protection
of Wavelet based Video Transmission
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Authors: Zhuo Xue, K.K. Loo, J. Cosmas
and P.Y. Yip
Abstract: In this paper, we propose a bandwidth efficient error resilience
scheme for wavelet based video transmission over wireless channel by
introducing an additional Wyner-Ziv (WZ) stream to protect region of interest
(ROI) in a frame. In the proposed architecture, the main video stream is
compressed by a generic wavelet domain coding structure and passed through
the error prone channel without any protection. Meanwhile, the predefined ROI
area related wavelet coefficients obtained after an integer wavelet transform
will be specially protected by WZ codec in an additional channel during
transmission. At the decoder side, the error-prone ROI related wavelet
coefficients will be used as side information to help decoding the WZ stream.
Different size of WZ bit streams can be applied in order to meet different
bandwidth condition and different requirement of end users. The simulation
results clearly revealed that the proposed scheme has distinct advantages in
saving bandwidth comparing with fully applied FEC algorithm to whole video
stream and in the meantime offer the robust transmission over error prone
channel for certain video applications.
Keywords: Distributed
Video Coding, Wyner-Ziv, Wavelet, ROI, Integer Wavelet Transform.
Title of the Paper: Benchmarking in
Digital Circuit Design Automation
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Authors: Lech
Jozwiak, Dominik Gawlowski and Aleksander Slusarczyk
Abstract: This paper focuses on benchmarking, which is the main experimental
approach to the design method and EDA-tool analysis, characterization and
evaluation. We discuss the importance and difficulties of benchmarking, as
well as the recent research effort related to it. To resolve several serious
problems related to quality of benchmarking and use of practical industrial
benchmarks, we proposed an adequate benchmarking methodology based on the
statistical experimental design approach, and developed corresponding digital
circuit benchmark generators. These benchmark generators enable research,
evaluation and fine-tuning of circuit synthesis methods and EDA-tools largely
independent of the actual industrial benchmarks, and much better than having
only some industrial benchmarks. Using the results of extensive experiments
that involved large sets of diverse benchmarks generated with our FSM benchmark
generator, we discuss several crucial problems of benchmarking and
demonstrate how to resolve them.
Keywords: Microelectronic
Circuit Design, Digital Circuits, EDA-tools, Benchmarking, Statistical
Experimental Design, Benchmark Set Quality
Issue 5, Volume 7,
May 2008
Title of the Paper: A General
Mathematical Model Based on Laplace and
Modified Z-Transform for Time and Frequency Domain Investigation of
Three-Phase Switched Circuits
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Authors: Jiri Klima
Abstract: A general mathematical method for both the time-domain and
frequency domain analysis of power converters with periodic switching
cuircuits is proposed .The method is based on mixed using of the Laúlace and
modified Z-Transform in linear periodically time-varying system. The model
was used for the analysis of three-phase voltage source inverters with Space
Vector PWM feeding a three-phase static load, or an induction motor drive but
it is applicable for all types of converters with an explicitly determined
output voltage (converters with forced commutation) and periodical
modulation..From the modulated waveforms we can easily obtained equations for
the six step waveforms.The derived equations are validated using a 3 kW
three-phase inverter.
Keywords: Mathematical
model,Laplace transform,Modified Z-Transform
Title of the Paper: Pulse Density
Recurrent Neural Network Systems with Learning Capability Using FPGA
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Authors: Yutaka Maeda, Yoshinori Fukuda
and Takashi Matsuoka
Abstract: In this paper, we present FPGA recurrent neural network systems
with learning capability using the simultaneous perturbation learning rule.
In the neural network systems, outputs and internal values are represented by
pulse train. That is, analog recurrent neural networks with pulse frequency
representation are considered. The pulse density representation and the
simultaneous perturbation enable the systems with learning capability to
easily implement as a hardware system. As typical examples of the recurrent
neural networks, Hopfield neural network and the bidirectional associative
memory are considered. Details of the systems and the circuit design are
described. Analog and digital examples for these Hopfield neural network and
the bidirectional associative memory are also shown to confirm a viability of
the system configuration and the learning capability.
Keywords: Hardware
implementation, Pulse density, Hopfield neural network, Bidirectional
associative memory, Learning, Simultaneous perturbation, FPGA
Title of the Paper: Lump Circuits
Elements Values Extraction of Acoustic Transducers Using Impedance
Measurement Approach
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Authors: Yeong-chin Chen , Lon-chen
Hung, Shuh-Han Chao andTseng-hsu Chien
Abstract: Acoustic transducers are the popular elements for sonar array. The
transducer of the simplify electrical equivalent circuit is discussed, and a
impedance measurement system is developed to estimate the elements value of
transducer’s lump circuit model at or near resonance. For practial
application, a matching transformer is designed to make the transducer a high
efficiency and high power transmitter. The experiment result approves the.
Impedance Measurement Approach is the effective method for high power
acoustic transducer development
Keywords: lump circuits,
Elements values extraction, Acoustic transducers, Impedance measurement
Title of the Paper: Improvements in
Power Quality and Efficiency with a new AC/DC High Current Converter
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Authors: Francesco Muzi and Luigi
Passacantando
Abstract: A very flexible AC/DC converter featuring high-output current,
reduced voltage ripple and highly adjustable current control is described.
The whole system consists of four stages and uses a proper switching
technique in conjunction with a feedback control performed by means of a PID
regulator. Moreover, the built prototype exhibits high efficiency and reduced
harmonic pollution. In order to evaluate the harmonic distortion on the
current drawn from the supply network, an FFT (Fast Fourier Transform)
analysis is performed. Finally, experimental and computation results for
output currents up to 400A, which confirm the correct behavior of the
proposed converter, are presented and discussed.
Keywords: AC/DC
converter, High direct-current, FFT, Electrical distribution systems, Power
quality.
Title of the Paper: Design and
calculation method for Dynamic Increasing Transmission Line Capacity
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Authors: Lijia Ren, Xiuchen Jiang,
Gehao Sheng and Wu Bo
Abstract: The Dynamic Line Rating (DLR) system is designed to improve the
transmission capacity of overhead lines, which decreases or delays to
re-build transmission lines. The system is composed of sampling terminals
installed on dead-end configuration of a line and one control instrument
equipped in dispatch center. The data between the sampling terminals and the
control instrument is transmitted through GPRS/GSM. Through Ethernet, the
control instrument exchanges data with SCADA interface in order to integrate
DLR and SCADA system. A solar Photovoltaic (PV) power supply system based on
Perturb & Observe MPPT techniques was designed and successfully applied
to outdoor on-line monitoring DLR system. The paper analyzed mechanical
actions for overhead line concerned wind speeds and wind direction in a
deflection plane. The force balance for overhead line in wind was analyzed in
detail, which deduces the mechanical model to calculate sags from the
measured tension. Overhead line’s state equation was corrected used the
relation of temperature and sags, and deduced the ultimately line’s
temperature. Analyzed the advantages and drawbacks of some mathematical model
used to calculate transmission capacity. In order that the DLR system
received the optimum dynamic capacity curve, combined the WM and TS model.
The result shows that the DLR system is effective in increasing line capacity
without violating the legal ground clearance, monitoring the on-line
parameters of transmission lines, and insuring the safe ground clearances of
transmission line at all times.
Keywords: Dynamic Line
Rating (DLR); Transmission line; Transmission capacity; Data acquisition
terminal; Photovoltaic Power Supply, MPPT, Conductor sag; Conductor tension
Title of the Paper: Accident analysis
of a surveillance camera system through a frequency-based processing
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Authors: Jaejoon Kim and Dae Gyu Lee
Abstract: The surveillance camera systems are commonly used in detecting the
traffic violation on the roads. A key requirement in most detection systems
is the ability for rapid automated analysis to identify the accidents. This
paper describes an accident analysis based on frequency information for
detecting the accident, identifying the cause of the accident and storing the
accident scene. When an accident happens, the surveillance system analyzes
the accident sound and stores the accident scene in real-time. The proposed
system utilizes the sound magnitude (dB) and frequency analysis (FFT) in
order to increase the accuracy of accident assessments. In addition, this
system accomplishes a continuous buffering without the presence of an
accident. It stores the prior accident scene, accident scene and post
accident scene. When this system is applied to the actual crossroads, it can
detect the accident presence and save the inspection expense. Results of
applying the proposed technique to data obtained from the detection of
accidents are presented and compared.
Keywords: Traffic
accident surveillance system, accident scene, sound analysis, frequency
information, accident presence, accident inspection.
Title of the Paper: Embedded Real-Time
Video Encryption Module on UAV Surveillance Systems
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Authors: Ciprian Racuciu, Nicolae Jula,
Constantin Balan and Cosmin Adomnicai
Abstract: A real-time video encryption module, developed to be used on an
electrical accelerated mini-helicopter (UAV), is presented in this paper. The
surveillance system is composed from six modules: image capture, encryption,
two radio link modules, decryption and display module. The hart of the
encryption system is the CV700C motherboard and it’s VIA C7 microprocessor
with ultra low power consumption and efficient heat dissipation. For
encryption, Rijndael algorithm was used.
Keywords: Encryption,
Rijndael, DirectShow, Real-time, Wireless, Embedded
Title of the Paper: Identification of a
continuous linear time-varying system using Haar wavelet with unit energy
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Authors: S.J.
Park, K.J. Kim and S.W. Nam
Abstract: In this paper, identification of a continuous-time linear
time-varying (LTV) system is proposed, where Haar wavelet with unit energy is
employed. For that purpose, an algebraic equation is derived by expanding the
input-output data and the time-varying impulse response using normalized Haar
wavelets. Unknown wavelet coefficients for the a LTV system’s impulse
response can be effectively estimated by solving the algebraic equation.
Finally, the time-varying impulse response of a LTV system can be synthesized
from the estimated wavelet coefficients.
Keywords: Linear
time-varying system, impulse response, identification, Haar wavelet
Title of the Paper: A New Study in
Maintenance for Transmission Lines
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Authors: Lijia Ren, Xiuchen Jiang,
Gehao Sheng and Wu Bo
Abstract: Because of increasingly common damage and thefts of the
transmission towers, a new function is proposed to enhance the state
maintenance of transmission lines. It relies on the monitoring of the
high-voltage transmission towers to ensure the reliability and safety of the
power grid operation. An approach which combines Independent Component
Analysis (ICA) with neural network based on Particle Swarm Optimization (PSO)
algorithm is presented. Its purpose is to extract the vibration source
signals caused by the theft of the towers. Initially, the proposed algorithm
separates the source vibration signals from the observed mixing signals based
on the FastICA of negentropy and Exploratory Projection Pursuit (EPP). In
order to distinguish the vibration pulse signal from other similar
interference pulses, the algorithm of the feed forward neural network (FFNN)
is used to identify the vibration pulses. It is trained online with particle
swarm optimization (PSO), which incorporates the pulse extraction algorithm
based on an adaptive threshold. Numerical results show that the algorithm is
effective in extracting and identifying the vibration signals, and it also
can suppress the interference signals.
Keywords: Transmission
tower; ICA;
Negentropy; Adaptive threshold; Particle swarm optimization (PSO); Neural
network
Title of the Paper: Fuzzy Techniques in
Analog Circuit Design
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Authors: Gabriel Oltean
Abstract: The aim of his paper is to present some applications of fuzzy
techniques in the optimization-based design of analog circuits. Our approach
turns into profit the advantages offered by different fuzzy techniques. Fuzzy
systems or fuzzy sets are involved in every algorithm phase. The optimization
problem formulation is accomplished in a flexible manner using fuzzy sets to
define fuzzy optimization objectives. Also, the initial guess of design
parameters is based on matching degrees determined with fuzzy sets. The
optimization engines use fuzzy systems to compute the coefficients to modify
the design parameters in each iteration. In order to reduce the time spent
for circuit performance evaluation, we use a fuzzy system to model each
circuit performance. Two computer-aided design tools, at the cell level are
developed in Matlab. A large collection of experimental results proves the
validity of our approach. Different analog modules as simple transconductance
operational amplifier, Miller operational transconductance amplifier, and
common-emitter stage were designed for several sets of design requirements
with very good results.
Keywords: Analog design,
Multiobjective optimization, Fuzzy sets, Fuzzy systems, Unfulfillment degree.
Title of the Paper: A genetic Algorithm
based Approach for System-on-Chip Test Scheduling using Dual Speed TAM with
Power Constraint
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Authors: Chandan Giri, Dilip Kumar
Reddy Tpparthi and Santanu Chattopadhyay
Abstract: Increasing complexity of System-on-Chip (SOC) has encouraged the
engineers to design versatile automated test equipment (ATE) that can drive
simultaneously different data channels at different data rates so that
overall test cost can be reduced. Devices like Agilent 93000 series tester
and Tiger system from Teradyne provide such flexibility to drive different
channels at different data rates. Number of tester channels with higher data
rate is limited due to different constraints like power rating of the SOCs,
limitation of scan frequency, complexity of ATE etc. Hence proper utilization
of the tester channels to reduce test time and thereby test cost is
important. In this paper we provide a Genetic algorithm based approach for
SOC-level TAM architecture optimization that minimizes testing time
considering two different data rates for ATE channels. Our approach achieves
better results than those reported in the literature. Experimental results
show that the maximum improvement of 40.99% in testing time can be achieved.
Keywords: System-On-Chip
test, Test scheduling, Test access mechanism, Dual speed, Power constraints,
TAM, Power-constrained testing.
Title of the Paper: High-PSR-Bandwidth
Capacitor-Free LDO Regulator with 50ìA Minimized Load Current Requirement for
Achieving High Efficiency at Light Loads
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Authors: Huan-ChienYang, Ming-Hsin
Huang, and Ke-Horng Chen
Abstract: A capacitor-free LDO regulator with the minimized-Q (MQ) and
adaptive zero compensation (AZC) techniques is proposed in this paper. With
the MQ technique, light load efficiency is greatly improved since only 50ìA
minimized load current is required. Furthermore, due to noise cancellation
from power supply, the LDO regulator with the MQ technique has higher PSR
bandwidth with compatible compensation capacitors compared to the Q-reduction
technique [1]. Besides, fast transient response time is also achieved because
phase margin equals to 60 degree is always maintained by the MQ and AZC
techniques. The capacitor-free LDO regulator with the MQ and AZC techniques
was fabricated in TSMC 0.35ìm 2P4M CMOS process with small compensation
capacitors 5pF and 1.5pF. Experimental results demonstrate that the minimum
load can be reduced to about 50ìA and transient response time can be reduced
by the MQ and AZC techniques to be smaller than 4ìs. The measured load and
line regulation are 20ìV/mA and 3.3mV/V respectively.
Keywords: Capacitor-free
LDO regulator, minimum load, frequency compensation, PSR bandwidth, fast
transient response
Title of the Paper: Modeling and Design
of Control System for Variable Speed Wind Turbine in All Operating Region
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Authors: Wu Dingguo and Wang Zhixin
Abstract: In order to get the maximum power from the wind, the variable-speed
wind turbine should run at different speed when wind speed changes. In this
paper a control system is introduced to get this purpose base on establishing
the three-mass model of the wind turbine. The control system consists of two
parts: one is a speed controller for generator control; the other is a PI
controller for pitch control. Simulation results by using actual detailed
parameters for wind turbine show the effectiveness and robustness of this
control system.
Keywords: three-mass
model, feed-forward compensator, loop-shaping, speed controller, pitch
controller, wind turbine, doubly-fed induction generator (DFIG)
Issue 6, Volume 7,
June 2008
Title of the Paper: A Method for
Content-Based 3D Model Retrieval by 2D Projection Views
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Authors: Hang Xiao, Xiubin Zhang
Abstract: An effective approach for 3D model retrieval is to represent models
by a set of projection views . In this paper, we propose a flexible framework
for view-based 3D model retrieval. The framework provides users the ability
to configure three components: the number of views, the type of views, and
the 2D shape descriptors used to distinguish views. Because the three
components are closely related to the performance of a view-based 3D model
retrieval system and usually application-dependent, it is necessary to make
them configurable. To achieve this goal, the framework employs a new view
polyhedron positioning algorithm and provides an adaptable interface to its
3D shape feature extraction module. We build a demo 3D model retrieval system
based on the framework. Experiment shows that the performance of the demo
system is satisfactory.
Keywords: 3D model
retrieval, information retrieval, 3D shape analysis, model feature
extraction, viewbased models
Title of the Paper: Robust Control
Applied to Improve the Performance of a Buck-Boost Converter
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Authors: Wilmar Hernandez
Abstract: In this paper, H∞ loop-shaping control is applied to improve
the performance of a buckboost dc-dc power converter based on
pulse-width-modulation (PWM) techniques. Here, classical control techniques
(i.e., proportional-integral-derivative (PID) control) and post-modern
control techniques (i.e., H∞ control), are used to design the feedback
loop of a buck-boost dc-dc power converter. The results of the experiment are
satisfactory and show that robust controllers do not depend strongly on the
operating point, and that H∞ loop-shaping control performs better than
PID control.
Keywords: buck-boost
converter, state-space averaging procedure, robust stability, PID control, H∞
loop-shaping control, disturbance rejection
Title of the Paper: Technological
Process Optimisation and Process Characterisation in Relation to the Quality
Assessment
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Authors: Radovan Novotný
Abstract: In order to optimise and characterize technological processes for
quality planning, evaluation and development purposes must be used proper
methodology. Methodology for designed experiment and uncertainty can be one
possible way to do this. Variation and effect of various technological
factors in relation to the material structures stability, consistency and
overall performance in the relation to the important aspects related to the
observation and analysis of the influence more than one variable at a time on
the response of interest.
Keywords: multi-vari
analysis, variation, optimization, experiment, factor, response, design
Title of the Paper: Low noise, dual
gain preamplifier with built in spectroscopic pulser for highly segmented
high-purity germanium detectors
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Authors: G. Pascovici, A. Pullia, F.
Zocca, B. Bruyneel, D. Bazzacco
Abstract: We present a fast and very low noise hybrid front-end electronic
device consisting of a complex charge sensitive preamplifier with a built in
fast reset circuitry and a very accurate spectroscopy pulser. The front-end
electronics was developed for the central electrode of 36-fold segmented,
high purity germanium detectors in the frame of AGATA array of detectors. The
intrinsic energy resolution in conjunction with a highly segmented detector
is less then 900 eV for central electrode with a detector capacity of ~ 47
pF. The dynamic range of the central charge sensitive stage is as large as
100 dB, ranging from 0.1 fC to 10 pC, i.e. from ~2 keV to 180 MeV in terms of
photon energy. To achieve such an unprecedented wide dynamic range, we split
the whole spectroscopic range in four sub-ranges, namely 0-5 MeV, 0-20 MeV,
5-180 MeV and 20-180MeV, respectively. The first two ranges are measured with
standard pulse-high spectroscopy techniques. Thereto, the analog electronics
was designed with two conversions gains, 200 mV/MeV and 50mV/MeV,
respectively to match the 1 V input dynamic range of the very fast pipe line
ADC used by the digitizer units. To extend the pulse-height spectroscopy
range well beyond the fast ADC analog input range, a new method was
implemented and at a certain threshold we are switching from a standard pulse
height analysis method to a time over threshold technique [TOT]. In order to
achieve that, adjacently to the pole-zero cancellation circuit, a fast-reset
circuit controlled by a fast comparator and an accurate zero crossing
detector has been developed. Using this technique we can achieve an energy
resolution of 0.04% at equivalent gamma energies of 180MeV. A programmable
spectroscopic pulser has been designed and implemented in the central
electrode (core) front-end electronic to achieve ‘self-calibration standards’
in both time and amplitude domain, which was needed to characterize such a
complex, highly segmented high purity solid state detector.
Keywords: low noise, fast
preamplifier, tracking gamma spectroscopy, extended ADC range
Title of the Paper: Hardware
accelerator for evolutionary robotics
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Authors: Masaya Yoshikawa, Hidekazu
Terai
Abstract: Evolution robotics is one of the autonomous learning and its
approaches have been applied to various fields. In this paper, we discuss new
evolutionary robotics technique. The proposed evolutionary robotics acquires
their behavior using genetic-based machine learning. It adopts new if-then
rules for learning algorithm. Moreover, it introduces novel hardware
accelerator in order to reduce simulation time for calculation, since the
genetics-based machine learning requires very long computational time.
Experiments using quasi-ecosystem demonstrate not only the effectiveness of
the proposed learning algorithm, but also that of the proposed hardware
accelerator.
Keywords: Evolutionary
robotics, Hardware accelerator, If-then rules, Genetic-based machine
learning, Quasi-ecosystem
Title of the Paper: Aspects Regarding a
New Method for the Optimal Control Law’s Synthesis of Aircrafts’ Move
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Authors: Lungu Mihai, Lungu Romulus,
Jula Nicolae, Cepisca Costin, Calbureanu Madalina
Abstract: The paper presents a new algorithm for optimal control law’s
synthesis in rapport with state vector of the aircraft’s move. Starting from
state equation of the movement, the system is brought to Jordan
canonic form and Riccati algebraic matricidal equation (whose solution is the
gain matrix of the control law) is brought to an equivalent form with
transformation relation. The new gain matrix is partitioned conform to
equations (35) ÷ (40). Using ALGLX algorithm, one studies elastic no deformed
(no dimensional description) longitudinal and lateral move of an aircraft and
dimensional elastic deformed move. One obtained Matlab/Simulink models and
numerical programs and with them time characteristics expressing state
variables’ dynamic are obtained.
Keywords: algorithm,
optimal, control law, longitudinal and lateral move, synthesis
Title of the Paper: Optimal Control of
Flying Objects’ Move After Estimated State Vector Using a Reduced Order
Observer
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Authors:Lungu Mihai, Lungu Romulus,
Jula Nicolae, Calbureanu Madalina, Cepisca Costin
Abstract: In this paper one presents an algorithm for project of a reduced
order observer (ALGLOOR) with applications to flying objects’ move. The
command law is an optimal one in rapport with state vector of the observer.
Numeric calculus examples are also presented: for longitudinal and lateral
move and vertical move of a rocket in vertical plane in rapport with equal
signal line; using Matlab/Simulink model of closed loop system one has made
numeric calculus programs and with them one obtained different time
characteristics, which expresses state variables’ dynamics of the flying
objects dynamic models.
Keywords: algorithm,
optimal, control law, rocket, state vector, reduced order observer, command
Title of the Paper: A Unified Treatment
of Deterministic and Random Transients in Electrical Circuits
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Authors: Sabin Ionel, Virgil
Tiponuţ, Catalin Caleanu, Ioan Lie
Abstract: The continuity of capacitor voltages and inductor currents,
well-known from the deterministic case, cannot be directly applied if the
initial conditions are random. In this paper, new continuity relations for
probability densities, mean values, correlation and covariance functions of
the state variables are introduced. These continuity relations can be used
for a global characterization of random transients. New formulas for initial
condition and forced components of transient statistical moments are also
presented. These formulas offer a direct approach for random transient
analysis. Deterministic transients can be regarded as particular,
degenerated, random transients. On this basis, one can develop a unified
treatment of deterministic and random transients in electrical circuits. This
unified framework is certainly an advantage, not only in teaching activities
related to transient phenomena.
Keywords: Electrical
circuit, Initial condition, Random transients, Statistical moments,
Continuity relations
Title of the Paper: Optimum Sway
Control for Overhead Traveling Cranes
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Authors: Kamal A. Khandakji and K. P.
Zdrozis
Abstract: Sway control for industrial applications and for cranes
particularly is a historical problem that has accompanied the development in
power semiconductors since the 1980’s. This article proposes a power
semiconductor drive system, which can be used in the anti-sway control of
overhead cranes driven three-phase induction motor. The developed system is
based on the rotor current control. The proposed power semiconductor drive
system is simulated using the developed comprehensive mathematical model. The
performance of the proposed systems is analyzed and compared to
voltage-controlled anti-sway system. A prototype of the proposed anti-sway
control system is developed at the laboratory of electric drives and
automation in ATEI – Greece,
while the mechanism prototype was developed by the project sponsor - Arab
Manufactures Company in Amman
– Jordan.
Keywords: Anti-sway
control, overhead traveling cranes, controlled current converter, three-phase
induction motor.
Title of the Paper: Robustness of
Systems with Various PI-like Fuzzy Controllers for Industrial Plants with
Time Delay
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Authors: Snejana Yordanova
Abstract: The robustness of the systems with fuzzy logic controllers (FLC)
has lately focused the attention of researchers in relation with the
expansion of their industrial application. The contemporary complex,
nonlinear, time varying processes with time delay and various disturbances
and the high demands for their control require to account for system
stability and robustness in the FLC’s design. The simplicity of the design is
of great importance in connection to its easy practical application. The aim
of the present investigation is to develop a generalised procedure for the
design of various PI-like FLCs with regard to system performance robustness
and to compare the robustness of the control systems. The approach is
developed for PI incremental and position FLCs based on the single input
fuzzy controller (SI FC), Popov stability and Morari robustness and considers
the control of industrial plants with time delay and model uncertainty. The
main contributions are: 1) a generalised design procedure for FLCs accounting
for system stability and robustness; 2) FLCs’ general tuning algorithm. The
results are applied for the stabilisation of the air temperature in a furnace
using MATLAB™. The performance of the designed FLC systems is assessed and
compared to the performance of control systems with internam model controller
via simulations.
Keywords: frequency
domain PI-like process FLC design, MATLAB, robust performance, temperature
control, time delay, tuning algorithm
Title of the Paper: Noise-based Wavelet
Denoising Technique for Partial Discharge Measurement
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Authors: Zhou-Sheng Zhang and Deng-Ming
Xiao
Abstract: For enhancement the insulation quality of medium voltage and high
voltage power cables, on-site partial discharge (PD) diagnosis tests such as
detection, location and identification are used to find defects or faults and
assess ageing degree of the cable insulation. Typical test methods such as
oscilating voltage waves (OVW), very low frequency (VLF) for medium cables
and frequency-tuned resonance (FTR) for high voltage cables are adopted by
far, especially for XLPE cable system. However, on-site interferences and
noises make this PD detection very difficult. It requires a better method to
extract PD pulses from severe noise circumstance. Wavelet transform technique
used to suppress noises from PD signal (PDs) requires reasonable mother
wavelet, amount of scales and thresholds to produce its best effect. This
paper proposed a new wavelet-based denoising technique for on-site PD
measurement of power cables. It aimed at applying discrete wavelet transform
(DWT) with better denoising effect to on-site PD measurement. Firstly, it described
and analyzed the testing methods for on-site PD measurement. Secondly,
resonable amount of scales selection algorithm and threshold determine
algorithm have been studied with this denoising technique. Finally,
simulation studies associated with this method are presented. Moreover,
previous wavelet denoising techniques are also studied here to compare to the
new technique. Results indicate that this technique can not only attain
better denoising effect but also improve the sensitivity of PD detection.
Keywords: Partial
discharge, discrete wavelet transform, power cables, oscilating voltage wave,
very low frequency, frequency-tuned resonance.
Title of the Paper: An Active Islanding
Detection Method for Small-Scale Distributed Generators
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Authors: Wen-Yeau Chang
Abstract: This paper proposes a new islanding detection method for use in a
small-scale, grid-interconnected distributed generator system. The proposed
islanding detection method is based on voltage fluctuation injection, which
can be obtained through high-impedance load switching on the grid
periodically. The correlation factor between the periodic switching signal
and the perturbed voltage is then used as an islanding detection index in the
proposed islanding detection method. Experimental results demonstrate the
principles of the proposed technique and show the new proposed method is
reliable, economical, and easy to implement.
Keywords: Islanding
detection, Distributed generator, Voltage fluctuation injection, Correlation
factor
Title of the Paper: An Efficient
Scheduling Algorithm Based On Multi-frequency TAM for SOC Testing
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Authors: Jiann-Chyi Rau, Po-Han Wu,
Jia-Shing Ma
Abstract: In recent years the advance of CMOS technology has led to a great
development, especially on the complexity of the system-on-chip (SOC). As the
development of circuit with different technology, the embedded cores embedded
into system-on-chips (SOCs) usually have multi-frequency to drive it. In this
paper, we present a heuristic approach of TAM optimization according to the
reality and reduce the test application time. The proposed method is
applicable to the design mo | 
