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Systems, Signals and Devices (SSD), 2012 9th International Multi-Conference on

Date 20-23 March 2012

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Displaying Results 1 - 25 of 240
  • Robust filter design for linear systems with parametric uncertainties via unreliable transmission channels

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (251 KB) |  | HTML iconHTML  

    A robust H filter design problem for a class of uncertain discrete-time systems with possible missing measurements due to unreliable networked transmission channels is investigated. The stochastic variable, satisfying Bernoulli random binary distribution, is introduced in this work to model the missing phenomena and the corresponding filtering error dynamics with delay is subsequently induced. A set of sufficient conditions is provided for the existence of the desired filter and a robust filter design method is developed within the linear matrix inequality (LMI) framework. A numerical example is given to illustrate the effectiveness of the developed design method. View full abstract»

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  • FPGA system-on-chip solution for a field oriented hybrid stepper motor control

    Publication Year: 2012 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (209 KB) |  | HTML iconHTML  

    The motivation of this work is the design of low-cost systems. With the chosen costumizable system-on-chip it is possible to design a complex controlling system on one chip. Besides a microcontroller there is also an FPGA. With this programmable logic device it is possible to make your design more flexible than a simple software solution. Besides the flexibility, there is also the performance which can be increased and also the reconfigurability of such hardware systems is increasing the flexibility. Due to the hardware solution the field oriented control can be divided into compute intensive parts and other parts which can be achieved in parallel. So there will be a very good efficiency for the FPGA and microcontroller. The particular thing is that there are costumizable system-on-chip with analog parts. In this case it is possible to combine the software part and the digital logic part with the analog part on one chip. Consequential a low cost solution is possible. View full abstract»

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  • Load balancing with minimal flow remapping for the Agile All-Photonic Network

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (307 KB) |  | HTML iconHTML  

    A novel routing architecture that balances Internet flows over the Agile All-Photonic Network (AAPN) is proposed. It is based on the adaptive Highest Random Weight (adaptive HRW) algorithm proposed to design load balanced Internet routers. The architecture extends the adaptive HRW algorithm with a minimal flow remapping selection scheme that identifies those source-destination edge node pairs whose flow traffic is causing imbalance in the network and need to adapt their weights. Simulation results shows significant reduction in the amount of flows remapped compared to the no selection scheme where all source-destination edge node pairs are forced to adapt their weights when imbalance is detected in the network. View full abstract»

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  • Critical optical power density in PIN-photodiodes

    Publication Year: 2012 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (332 KB) |  | HTML iconHTML  

    PIN photodiodes are often used in optical integrated circuits. Although they can feature a very good RF-performance, this can be effected by the optical power density of the incident light. The influence of this effect on the RF-performance of PIN photodiodes is described. When a critical optical power density in the epi-layer is exceeded the 3dB frequencies are cut off. An analytical equation is derived to describe the effect. The results are compared to RF measurements and verified by numerical simulation. View full abstract»

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  • Energetical aspects in transducers operation and classification, with emphasis on electrical measurement of mechanical quantities

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB) |  | HTML iconHTML  

    Several ways in which the energy transfer is involved in the operation of electromechanical transducers are examined. Among the SI quantities, classes of intensive and extensive quantities may be distinguished, pairs of them forming together parameters having the dimension of an energy. Another interesting classification is in terms of the degree with which they appear in the fundamental equations of Physics, characterizing active and passive systems. Such systems are frequently found in the structure of force transducers. As a representative category of electromechanical devices, force transducers are deeply analyzed, their classification is commented and a few significant examples based on strain gauges are presented. View full abstract»

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  • Modeling and optimizing Ultra Wideband antennas for microwave breast cancer detection

    Publication Year: 2012 , Page(s): 1 - 6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3204 KB) |  | HTML iconHTML  

    In this paper, two compact Ultra Wideband (UWB) antennas have been proposed to be in touch with skin for microwave breast cancer detection. The UWB techniques allow for a good shape-identification and allow sensing of dielectric properties differences among tissue types over a very wide frequency band. The UWB antennas are designed and analyzed using CST simulation tool in transient mode to verify antenna parameters improvements. The simulation results indicated the improvement of the antenna response by properly selecting antenna dimensions and antenna shape. View full abstract»

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  • Nanometalpolymers as ion-selective sensors

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (341 KB) |  | HTML iconHTML  

    The feasibility of usage of metal-polymer composites (PSE-1 polystyrene matrix) as electrode-active elements of solid-state potentiometric sensors for direct determination of heavy-metal ions in aqueous solutions has benn studied. The properties of electrode-active elements based on composites containing nickel, cobalt, and silver nano- and microparticles in a polystyrene matrix have been investigated, and the potentiometric selectivity coefficients have been determined for every composites. View full abstract»

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  • Synthesis and modeling of influence of precipitation conditions on growth speed, composition and structure of amorphous hydrogenised carbon films

    Publication Year: 2012 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (307 KB) |  | HTML iconHTML  

    This researh is devoted to evaluation of synthesis condition influence on properties of amorphous hydrogenised carbon (a-C:H) film precipitation processes. Analysis of technological parameters (partial methane pressure PCH4, power of HF radiation W and self-bias Ubias) impact on precipitation speed, composition and structure of a-C:H films is presented in the frame of precipitation and growth of amorphous and crystalline materials model [1]. It is shown that growth speed is proportional to √P(CH4) and fraction of sp2-hybridised carbon is proportional to 1/√P(CH4); increase of methane pressure or decrease of HF radiation power and self-bias yields higher bonded hydrogen concentration. View full abstract»

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  • Design and simulation dual-band PIFA antenna for GSM systems

    Publication Year: 2012 , Page(s): 1 - 4
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB) |  | HTML iconHTML  

    In this paper, a new design of a dual band Planner Inverted-F Antenna (PIFA), for cellular telephone systems and other applications is presented. The PIFA antenna is composed of ground plane, patch antenna, feeding post and shorting plate connected to the ground plane. The designed antenna has been simulated using the CST 2010 software. The simulated results for the resonant frequency, return loss, radiation pattern and gain are presented and discussed. The bandwidths of 114MHz and 176MHz for GSM900 and GSM1900 respectively are achieved on the basis of ≤ -6 dB return loss as an acceptable reference in mobile phones applications. A gain of 1.933dB and 4.74dB is obtained in lower and higher frequency respectively. View full abstract»

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  • Control and automation engineering education: Combining physical, remote and virtual labs

    Publication Year: 2012 , Page(s): 1 - 10
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB) |  | HTML iconHTML  

    This paper discusses challenges and opportunities in engineering education, in particular in the area of control and automation, that have been made possible through advanced IT systems and Internet. The paper reviews different types of didactic plants that evolved hands-on and simulated labs, both local as remotely accessed, to mixed reality and virtual world labs, where student avatars are used to increase the sense of reality and promote collaboration. As experience shows that alone the use of such didactic plants is not enough to ensure success in the learning process and that their integration into e-learning environments is important, the main characteristics of Computer Supported Collaborative Environments (CSCE) are discussed and some relevant initiatives in this area are reviewed. The paper also describes an e-learning system developed by the authors, which has been successfully applied to several automation engineering courses in Brazil. View full abstract»

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  • Optimal control for a class of 2-D shift variant systems

    Publication Year: 2012 , Page(s): 1 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (285 KB) |  | HTML iconHTML  

    This paper suggests a new method of solving optimal control problem for F-MM I (first Fornasini-Marchesini's model) state space model of discrete two-dimensional (2-D) systems with variable coefficients. This method not only resolves the boundary conditions complexities in the 2-D optimal control problems, but also guarantees reduction of computation compared to the other methods. In order to solve the standard 2-D LQR Problem, It is shown that the 2-D system under a specified quadratic performance index can be cast as a new semi-one-dimensional (semi-1-D) system which is called “L-shaped model”. This model can be applied to other 2-D models as well. Using a theorem and two conclusions in 1-D optimal control theory, an algorithm is introduced to solve optimal control for 2-D systems. Finally, evaluation of the approach is illustrated through a numerical example. Result shows the effectiveness of the proposed procedure. View full abstract»

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  • Model reference robust backstepping design for pneumatic driven ball screw table system

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (339 KB) |  | HTML iconHTML  

    A model reference robust backstepping controller is proposed for radial pneumatic motor motion systems with variable inlet pressure and time-varying payload. The radial pneumatic motoe, first of all, is modeled by a non-autonomous equation with consideration of the ball screw table. A practical integral action and robust action are included in the controller design for compensating the disturbance and eliminate the steady state error. Experimental results show that the proposed controller is able to tracking reference model output signal and maintain stead-state error. Model reference robust backstepping control utilizes Lyapunov function to guarantee the convergence of the position tracking error. View full abstract»

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  • Fuzzy-based gang scheduling approach for multiprocessor systems

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (166 KB) |  | HTML iconHTML  

    Different types of task scheduling problems have been formulated due to their importance in operating systems design. However, the problem has been shown to be computationally difficult and it is not possible to obtain optimal solutions. Therefore, more attention has been paid to formulate approximate and heuristic algorithms during recent years. This paper presents an attempt to adopt a modified scheduling algorithm suitable for multiprocessor systems by applying soft computing concepts. It suggests a modified approach for multiprocessor scheduling by combining gang scheduling and fuzzy logic decision maker. The fuzzy decision maker uses incomplete information about current states of the jobs and multiprocessor system to compute a new priority for each runnable task. The proposed scheduling approach is tested on several case studies, and computational results are compared to those obtained with other approaches. The given results proof that the proposed approach achieves the best performance including the computational efficiency, the average waiting time, and the average turnaround time. View full abstract»

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  • Photovoltaic energy harvesting for hybrid/electric vehicles: Topology comparison and optimisation of a discrete power stage for European Efficiency

    Publication Year: 2012 , Page(s): 1 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB) |  | HTML iconHTML  

    This paper presents a topology comparison of a hybrid low-voltage step-up dc-dc converter in terms of European Efficiency. Such converters are suited to be integrated with solar cells, thus forming a photovoltaic energy harvesting architecture dedicated for an integrated realisation of a solar range extender for electric vehicles. Except of a discrete power stage realisation, the rest of a system, such as control, time and power management, shall be monolithically integrated in the AMS 0.35μm HV CMOS process. Developed efficiency model allows straightforward comparison of different converter topologies, as shown on an example of the dc-dc converter which supplies the electric vehicle auxiliary board net (12 V) with photovoltaic power up to 40 W from a stack of 9-10 solar cells. Optimisation of the design variables: the external power switches, and the converter switching frequency is outlined on a given example. View full abstract»

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  • Comparison of engineering results within domain specific languages regarding information contents and intersections

    Publication Year: 2012 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (146 KB) |  | HTML iconHTML  

    Engineering of automated facilities requires to deal with hidden and case specific interdependencies between the involved disciplines and the technical artifacts. Each technical specification or design decision in one discipline can affect other disciplines. Interdependencies might be visible or known to the other disciplines, but due to the different domain specific languages used in the different disciplines, the visibility is not necessarily given. Between the different domain specific languages, information intersections exist, but also information gaps. Within this paper, the results of a case study on domain specific languages and interdependencies within the engineering process of automated facilities are presented. The paper gives an overview of the typically used domain specific languages in the context of the particular tasks and engineering artifacts. To identify and evaluate the cross discipline intersections a new method combining workflow and dataflow analysis is presented. View full abstract»

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  • Investigations of annealing temperatureand aging time on energy conversion efficiency of Cu2S/CdS solar cells

    Publication Year: 2012 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (251 KB) |  | HTML iconHTML  

    Different structures of Cu2S/CdS solar cells under different deposition parameters were prepared using vacuum thermal evaporation technique. The transmittance of CdS thin films was measured for different light wavelengths. The films exhibited high degree of transmittance in the infrared region and sharp falling absorption edge at nearly 500 nm. On the other hand Cu2S layer has a maximum transmittance at 700 nm wavelength. It was also noticed that the sample exposed to 100°C annealing gave maximum photocurrent (1.5 mA) but lower open circuit voltage (0.365 V). A maximum open circuit voltage (0.4V) and lower short circuit current (1.3 mA) was produced by the sample exposed to 400°C annealing. The variation of Voc as a function of aging time for the Cu2S/ CdS films under repeated cycles of illumination and annealing is investigated. The results show clearly that the annealing improves the fabricated Voc samples and Voc. increases considerably with time. A technique involving heat treatment, washing and depositing a very thin layer of copper on top of the solar cell has been employed to improve the cell efficiency. View full abstract»

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  • Analysis of arm current harmonics in modular multilevel converters with main-circuit filters

    Publication Year: 2012 , Page(s): 1 - 6
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (345 KB) |  | HTML iconHTML  

    In a modular multilevel converter the circulating current that flows through each phase leg can affect the performance and efficiency of the converter. If measures are not taken to control the circulating current, it will inevitably contain a second-order harmonic. There are various solutions for eliminating this second-order harmonic. One of the proposed solutions includes a main-circuit filter that is tuned to block the second-order harmonic in the circulating current. This paper presents an analytical relation between the ac-side current and the higher-order harmonics in the circulating current when such a filter is used. It is found that when third-order harmonic injection is used, a large fourth-order harmonic component may appear in the circulating current. This is verified by simulating a 32-MVA converter designed for grid connected applications. The simulation results support the conclusion that it is essential to take this effect into consideration when designing the main-circuit filter. View full abstract»

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  • Design of wide tuning injection locked frequency divider and LC_VCO for multi-standards applications

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (229 KB) |  | HTML iconHTML  

    A design of divide-by-2 injection-locked frequency divider (ILFD) and LC_VCO is presented in this work. The ILFD circuit is realized with a differential CMOS LC-tank oscillator with an injection MOS. The proposed design accomplishes wide tuning range frequency by using binary weighted switched varactor in addition to a linearly varying varactor. It can be applied for multi-standard wireless applications. The tuning range of the ILFD carrier frequency is from 1.2 to 1.75GHz. At the injection signal power of 0 dBm, the locking range is about 1.1 GHz from the incident frequency 2.4 to 3.5 GHz. The phase noise of the locked output is -123.4 dBc/Hz at 1 MHz offset frequency. The power consumption of total circuit is 22.98mW. Only 6.19 mW is consumed by the ILFD. View full abstract»

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  • Evaluation of fractional residual

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (222 KB) |  | HTML iconHTML  

    The paper deals with fractional residual evaluation. Three methods to evaluate fractional residuals generated by dynamic parity space method are presented. They are based on the fractional derivative approximations: the Grünwald, the pole-zero and the Diethelm approximations. They are compared in order to select the best method in terms of precision and minimum detection time delay. View full abstract»

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  • Modeling and simulation of a PWM rectifier inverter induction motor drive system implementing speed sensor less direct vector control

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (205 KB) |  | HTML iconHTML  

    The paper describes control method for PWM rectifier-inverter induction motor drive. A control scheme is developed that uses stator flux oriented direct vector control (voltage source current controlled PWM inverter) for the induction motor and voltage source voltage controlled PWM rectifier to special configurations for harmonic reduction and unity power factor operation. View full abstract»

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  • Improved power allocation in parallel Poisson channels

    Publication Year: 2012 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (306 KB) |  | HTML iconHTML  

    The optimum power allocation for parallel Poisson channels which can minimize average power for obtaining maximum capacity is considered. In this paper a new power allocation scheme that outperforms previous schemes for more than enough powers is presented. Since in Poisson channels unbounded channel feeding with input power do not lead to a better utilization of the channel capacity, in the presented scheme extra powers that are more than required power for achieving maximum capacity are not used or if power dissipation is not possible, the extra power can be allocated in a new way which shows an improvement in the channel capacity. This approach is applied to the 2-fold parallel Poisson channels and is generalized to n-fold. View full abstract»

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  • Universal hardware and software package for electronic spectroscopy

    Publication Year: 2012 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (449 KB) |  | HTML iconHTML  

    Nowadays, when it comes to the development of modern semiconductor based electronic components there is a growing role of the solid body properties determined by the surface and the near-surface areas. There is an obvious need for the employment of research methods sensitive to the composition and the structure of the external surface of solid bodies. View full abstract»

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  • Evaluation of auxiliary tone based MAC scheme for wireless ad hoc networks with directional antennas

    Publication Year: 2012 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (158 KB) |  | HTML iconHTML  

    This paper presents an analytical evaluation of auxiliary tone based MAC scheme that has been proposed to mitigate the directional antenna utilization problems in wireless ad hoc networks. We conducted a comparison study between two different Markov models for auxiliary tone based MAC scheme. In the proposed model in addition to the idle, success, and fail states, also the defer state has been considered that is more realistic. Results show that the proposed scheme outperforms the RTS/CTS based MAC scheme not only in high density networks but also in networks with low probability of transmission and low density networks. View full abstract»

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  • A PCA-based interpretation of ultrasonic data for accurately detecting a corridor wall

    Publication Year: 2012 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (682 KB) |  | HTML iconHTML  

    This paper introduces a validated model for the ultrasonic detection by processing sensor data and it presents a new approach for evaluating the orientation of a regular wall. The method described is based on the Principal Component Analysis (PCA) which gives the opportunity to make some geometrical considerations on the effectiveness of the scanning results. Several experiments are conducted scanning a regular corridor wall and also propagating ultrasonic waves towards a wall opening. In every instance these tests permit to confirm the applicability of the new proposed strategy. View full abstract»

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  • Improvement of start up torque of three phase induction motor operating with single phase supply

    Publication Year: 2012 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (231 KB) |  | HTML iconHTML  

    This paper addresses a new single-phase starting technique of a three phase induction motor. Indeed, three-phase induction motors operating with a single-phase ac supply are not self starting of their own, hence an external device must be used to get them started. The former starting technique with capacitor is often used. So, in this paper a simple and low cost single-phase to three-phase converter is proposed in order to start up a three phase induction motor operating with a single-phase ac supply. The goal is to improve the starting performances such as high starting torque and low inrush current. The device is based on the use of naturally firing thyristor or ac bidirectional switches (triacs), from which rotating magnetic field is created using the Discrete Frequency Control (DFC) of the switches. Instead to start up with capacitor, a low generated frequency with a single phase supply allows start up with high starting torque. The effectiveness of the proposed starting method has been verified by both simulation and experimental results. View full abstract»

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