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Systems, Signals and Devices, 2008. IEEE SSD 2008. 5th International Multi-Conference on

Date 20-22 July 2008

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Displaying Results 1 - 25 of 138
  • [Title page]

    Publication Year: 2008 , Page(s): 1
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  • [Copyright notice]

    Publication Year: 2008
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  • IEEE SSD08 Committees

    Publication Year: 2008 , Page(s): 1 - 5
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  • Preface

    Publication Year: 2008 , Page(s): 1
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  • Building tomorrow’s electrical engineers

    Publication Year: 2008 , Page(s): 1 - 2
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  • Control and safety verification based on a para-consistent logic program EVALPSN

    Publication Year: 2008 , Page(s): 1 - 2
    Cited by:  Papers (4)
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  • The use of DSPs as controllers in mechatronics

    Publication Year: 2008 , Page(s): 1 - 2
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  • Reduced structure inverter fed electric motor drives: An attempt to improve the cost-effectiveness, the compactness and the reliability of hybrid propulsion systems

    Publication Year: 2008 , Page(s): 1 - 2
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  • Smart metering based on automated meter reading

    Publication Year: 2008 , Page(s): 1 - 2
    Cited by:  Papers (1)
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  • Potential of carbon nanotubes for sensor applications

    Publication Year: 2008 , Page(s): 1 - 2
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  • Wireless sensor concepts

    Publication Year: 2008 , Page(s): 1 - 2
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  • Papers list

    Publication Year: 2008 , Page(s): 1 - 7
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  • Authors index

    Publication Year: 2008 , Page(s): 1 - 2
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  • A novel method for harmonics and low switching-frequency eliminations for a three-phase PWM inverter

    Publication Year: 2008 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3830 KB) |  | HTML iconHTML  

    Harmonics and switching frequency cause a major problem in power system. A novel harmonic elimination technique and low switching frequency in a three-phase pulse width modulation (PWM) inverter are proposed in this paper. This inverter is associated with a LC filter. The technique determines the commutation angles based by solving a set of nonlinear system equations. This commutation angles are determined off-line (Pre-Calculed) and stored in the microcontroller memory in order to speed up the online control of the processes. The pre-calculated switching is modelled to cancel the greater part of low-order harmonics and to keep a single-pole dc voltage across the polarized capacitors. LC filter is designed to cancel the high-order harmonics. This approach allows substantial reduction of the harmonic ratio in the AC main output voltage without increasing the switching-frequency per period. Consequently, the duties of the semiconductor power switches are alleviated. To show the validity of the new harmonic elimination and low switching-frequency, DSP based experimental results are presented. These results are very satisfactory and prove the effectiveness of the new approach. View full abstract»

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  • Use of LDPC to improve the MIMO-OFDM systems performance

    Publication Year: 2008 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5757 KB) |  | HTML iconHTML  

    Orthogonal frequency division multiplexing (OFDM) is a promising technique in the next evolution of the mobile telephony, However it suffers from peak to average power ratio (PAPR). It is a problem for broadcast engineers in many different applications. Non-linearities can cause severe out-of-band radiation when confronted with high PAPRs. Previous work has shown that the application of coding just before the transmission frontend can help alleviate this effect. This paper presents a design for a low density parity check (LDPC) code that achieves a good error correction performance and is used to lower the PAPR in a multiple input multiple output orthogonal frequency division multiplex system. The paper will detail the results of software simulations, verified through hardware simulations that show that further reductions in PAPR can be achieved over previous work in this field. Finally, this paper will show that PAPR reduction can be achieved by employing LDPC coding prior to modulation. View full abstract»

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  • Active RFID tag in Real Time Location System

    Publication Year: 2008 , Page(s): 1 - 7
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5894 KB) |  | HTML iconHTML  

    This paper proposes a new upcoming model of real time location system (RTLS) to focus and track the exact location of real time objects in vicinity. Overcoming the limitations of size, power, attenuation of GPS & DGPS system, the active RFID tags can be easily affixed with objects. The TIA approach of distance calculation will minimize the errors occurred in RSSI method. Geographically fixed matrix of RFID readers at 50 m to 1 km apart, will monitor, track, and calculate the exact position of tagged-object by communicating with the tag and other co-readers. One 48 MHz PLL enabled 8-bit CPU in RFID reader is enough to calculate the TIA with an accuracy of 3.3 m distance. One active tag with 100 mAh cell can respond many thousands of times using IEEE802.15.4 standard which makes it globally acceptable. DSSS and GFSK used in the tag for more reliable data communication. One central server is enough to store, filter, and handle the calculated data flowing from the matrix net of RFID readers. View full abstract»

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  • Cascade sliding mode control of a field oriented induction motors with varying parameters

    Publication Year: 2008 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1104 KB) |  | HTML iconHTML  

    An adaptive nonlinear sliding mode controller combined with a field orientation scheme has been developed for the control of induction motor to achieve rotor angular speed and rotor flux amplitude tracking objectives. The inputs to the controller are the reference speed, the reference flux, the measured stator currents, the measured rotor speed, the estimated rotor flux, and estimates of the varying non measurable parameters. The unknown load torque and the rotor resistance which may vary during operation. The controller outputs are the reference stator voltages. An accurate knowledge of the rotor flux, the load torque and the rotor resistance is the key factor in obtaining a high-performance and high-efficiency induction-motor drive. The rotor flux is estimated using the induction-motor rotor-circuit model. Although the estimated rotor flux is insensitive to the stator-resistance variation, it does depend on the rotor resistance. A stable model reference adaptive system (MRAS) rotor-resistance estimator insensitive to stator-resistance variation as well as a load torque estimator have been designed. The use of cascade sliding mode control structure and continuous adaptive update of the machine parameters ensures accurate flux estimation and high-performance operation. Simulation results are presented to verify the stability of the induction-motor drive in various operating modes. View full abstract»

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  • A reconfigurable system for digital signal processing

    Publication Year: 2008 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1302 KB) |  | HTML iconHTML  

    Commonality of various algorithms is analyzed based on the research of algorithms commonly used digital signal processing and a reconfigurable cell is proposed. A reconfigurable system with the cells is designed, which is widely used in a variety of digital signal processing. The principle and method of using this system are discussed with the basic algorithms of digital signal processing - multiplication and adder - as example. By means of simulation and implementation, it is found that this system has much higher processing speed and efficiency, compared with other kinds of GM multipliers. View full abstract»

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  • Multi-objective optimization of TSK fuzzy models

    Publication Year: 2008 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1015 KB) |  | HTML iconHTML  

    In this paper we propose a hybrid algorithm to optimize the structure of TSK type fuzzy model using back-propagation (BP) learning algorithm and non-dominated sorting genetic algorithm (NSGA-II). In a first step, BP algorithm is used to optimize the parameters of the model (parameters of membership functions and fuzzy rules). NSGA-II is used in a second phase, to optimize the number of fuzzy rules and to fine tune the parameters. A well known benchmark is used to evaluate performances of the proposed modeling approach, and compare it with other modeling approaches. View full abstract»

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  • Designing an expert system of liver disorders by using neural network and comparing it with parametric and nonparametric system

    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1999 KB) |  | HTML iconHTML  

    The In this essay, we are going to design a medical expert system by using neural network. In order to test the system, we used the data in the intended bank e.g. BUPA liver disorders. We compare the operation of the system with parametric methods -like Bayesian decision making theory- and non parametric methods. By analysis of the data, we first discovered an undesirable field in the bank which causes to decrease learning rate of the system. When we omitted this field, we concluded very good results. By comparing the three above systems, we concluded that the neural network has the best operation and effect in liver disorder diagnosis. This result has also been improved so far. View full abstract»

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  • Weighted network reliability and modeling

    Publication Year: 2008 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (895 KB) |  | HTML iconHTML  

    This paper presents analysis, calculations, and modeling of weighted network reliability. Basic equations for the reliability evaluation are stated, and an algorithm presented for calculation of weighted network reliability and program written in FORTRAN language for implementing that. Reliability found for different both (weighted and unweighted) networks, and the results were compared. View full abstract»

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  • A new selective encryption technique of JPEG2000 codestream for medical images transmission

    Publication Year: 2008 , Page(s): 1 - 4
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3610 KB) |  | HTML iconHTML  

    In this paper, a novel selective encryption image scheme based on JPEG2000 is proposed, which encrypts only the code-blocks corresponding to some sensitive precincts. In order to improve the security level we introduce the permutation of codeblocks contributing in the selected precincts. Symmetric encryption AES with CFB mode is used to encrypt swapped codeblocks. The idea of combining permutation and selective encryption is used in order to minimize the amount of processed data encryption while ensuring the best possible degradation through the permutation. The proposed process encryption doesn't introduce superfluous JPEG2000 markers in the protected codestream, i.e, the protected codestream format is compliant to JPEG2000 codestream one. It keeps file format and compression ratio unchanged and doesn't degrade the original error robustness. The proposed scheme works with any standard ciphers and introduces negligible computational cost. View full abstract»

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  • A new and improves skin detection method using RGB vector space

    Publication Year: 2008 , Page(s): 1 - 5
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3783 KB) |  | HTML iconHTML  

    This paper describes a new method for skin detection based on RGB vector space. Skin color has proven to be a useful cue for pre-process of face detection, localization and tracking. Image content filtering, content aware video compression and image color balancing applications can also benefit from automatic detection of skin in images. Numerous works for skin color segmentation and detection have been reported in the literature in the last few years. In this paper first few pixel based methods are presented and then vector calculations as an efficient approach for determination of skin area based on implicit mathematical model is proposed. In order to evaluate our method we performed an experimental study. Results obtained are very promising and shows important advantages over other techniques. View full abstract»

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  • Design and implementation of RFID system

    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5857 KB) |  | HTML iconHTML  

    This paper deals with the Radio Frequency Identification (RFID) and shows a full design for an RFID system. This system was designed as a security system for corporate and an office where a list of employees is provided in a database in the main computer and each employee is given a Tag that holds a specific identification number. The system will identify the employees as they pass nearby the Reader. A software application works as an interface application to the RFID system. The RFID system was designed using the concept of FSK modulation as a technique to transmit and receive the signal. The FSK modulator works on two discrete frequencies 14 MHz and 6 MHz. The Demodulator part of the RFID system was designed to detect the amplitude of the RF signal and then converting it to a digital signal that the microcontroller can read. The designed RFID system was able to function properly where a successful communication occurred between the Reader and the Tag. View full abstract»

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  • QRS complex detection based on Symmlets wavelet function

    Publication Year: 2008 , Page(s): 1 - 5
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1306 KB) |  | HTML iconHTML  

    Wavelet theory is inspired the development of a strong methodology for signal processing and can be used as a good tool for non-stationary electrocardiogram (ECG signal) detection. In this paper a QRS complex detection method is proposed based on wavelet transform (WT) with Symmlets function. The proposed method show sharp results for ECG detection parameters. The fiducial points are easily detected and the results show that the sensitivity of the proposed detector is 99.8% and the specificity is 98.6%. The results obtained in this paper are based on real ECG signal. View full abstract»

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