Research Articles
Communication
Mahdi Nangir
Abstract
In this paper, we present a practical encoding and decoding scheme for the binary Wyner-Ziv problem based on graph-based codes. Our proposed scheme uses low-density generator-matrix (LDGM) codes in lossy source coding part and low-density parity-check (LDPC) codes in syndrome generation and decoding ...
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In this paper, we present a practical encoding and decoding scheme for the binary Wyner-Ziv problem based on graph-based codes. Our proposed scheme uses low-density generator-matrix (LDGM) codes in lossy source coding part and low-density parity-check (LDPC) codes in syndrome generation and decoding part. Actually, we apply Bias-Propagation algorithm for lossy source coding or binary quantization and Sum-Product algorithm for syndrome-based channel decoding. Using appropriate degree distributions for LDGM codes and optimized degree distributions for LDPC codes, we will be able to achieve close rate-distortion performance to the theoretical Wyner-Ziv bound. Also, we extend our proposed scheme for presenting a practical coding scheme for the binary Chief Executive Officer (CEO) problem. In our scheme, encodig is based on binary-quantization and Slepian-Wolf coding using source-splitting technique. It is shown that, source-splitting technique is an efficient strategy for achieving non-corner points in Slepian-Wolf rate region. We show that, this technique along with iterative message-passing algorithms can be efficient for having close rate-distortion performance to the Berger-Tung inner bound of binary CEO problem for non-corner points too.
Research Articles
Nanotechnology
Farzaneh Jahanshahi Javaran; Somayyeh Jafarali Jassbi; Hossein Khademolhosseini; Razieh Farazkish
Abstract
A novel technique for creating logic gates and digital circuitry at the nanoscale is quantum cellular automata (QCA). The sensitivity of the circuit is enhanced and quantum circuits are more susceptible to unfavorable external conditions when component size are reduced. In this article, we offer a five-input ...
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A novel technique for creating logic gates and digital circuitry at the nanoscale is quantum cellular automata (QCA). The sensitivity of the circuit is enhanced and quantum circuits are more susceptible to unfavorable external conditions when component size are reduced. In this article, we offer a five-input majority gate with fault-tolerant feature in QCA technology, taking into account the significance of constructing circuits that can withstand flaws. We also assess all potential defects in the process of arranging cells in specific locations on the surface. These errors consist of extra cells, rotation, deletion, and displacement. The gate under study is subjected to the aforementioned four failure categories in the first stage. The QCADesigner simulator engine is then used to assess the accuracy of the circuit performance in the second step. 41 quantum cells have been used to make the gate of this five-input majority gate with fault-tolerant feature in QCA technology. Several techniques are explored to discover such a majority gate, such as adding cells (i.e., introducing redundancy into the circuit) and particular cell layout techniques. The goal is to come up with a design that can ideally withstand possible faults with the least amount of overhead on the circuit for fault-tolerant through a certain cell layout. The findings demonstrate the implemented majority gate's notable advantage over comparable scenarios.
Research Articles
Industrial Electronics
Saeid Ahmadi; Kourosh Khalaj Monfared; Mohammad Khalilzadeh; Hossein Imaneini
Abstract
Power semiconductor devices are the most important components in power electronics applications. They are also the most fragile components of electronic circuits. A power semiconductor device's switching performance and protection depend on the gate drive circuit specifications. Therefore, choosing an ...
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Power semiconductor devices are the most important components in power electronics applications. They are also the most fragile components of electronic circuits. A power semiconductor device's switching performance and protection depend on the gate drive circuit specifications. Therefore, choosing an appropriate gate-driver and designing its corresponding circuits is necessary. This paper is a technical review of the proper design of gate drivers for silicon power switches (like Si IGBT and Si MOSFET) in industrial power electronics applications. In this paper first conducts an overview of the main specifications of gate drivers for industrial power electronics applications. Then, concerning the protective role that a gate-driver can provide, crucial points of an effective design are discussed. Finally, a circuit is proposed to test the gate driver's short-circuit protection. The circuit is experimentally evaluated for three gate drives, and the results are discussed. A practical comparison of the protection performance of commercial gate drives ACPL-330J, ACPL331, and PC929 is also conducted.
Research Articles
Optimization
Asieh Ghanbarpour; Soheil Zaremotlagh; Fahimeh Dabaghi-Zarandi
Abstract
Optimization algorithms are widely used in various fields to find the best solution to a problem by minimizing or maximizing an objective function, subject to certain constraints. This paper introduces the development and application of an innovative optimization algorithm (WOADD) designed to address ...
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Optimization algorithms are widely used in various fields to find the best solution to a problem by minimizing or maximizing an objective function, subject to certain constraints. This paper introduces the development and application of an innovative optimization algorithm (WOADD) designed to address the challenges posed by constrained optimization problems with dependent data. Unlike traditional algorithms that struggle with data dependencies and valid range constraints, WOADD incorporates a novel normalization process and a dynamic updating mechanism that accurately considers the interdependencies among features. Specifically, it adjusts the search strategy by calculating a scaling parameter to maneuver within feasible regions, ensuring the preservation of data dependencies and adherence to constraints, thus leading to more efficient and precise optimization outcomes. Our extensive experimental analysis, comparing WOADD against other swarm-based optimization methods on a suite of benchmark functions, illustrates its superior performance in terms of faster convergence rates, improved solution quality, and enhanced determinism in outcomes.
Research Articles
Electronics
Farid Khamouei Touli; Javad Yavand Hasani
Abstract
Radiofrequency microelectromechanical system (RF-MEMS) switches are utilized across a broad spectrum of industries, telecommunications, aerospace and smartphone technology.Herein, we proposed a new numerical and simulation analysis approach for spring constant (k) values as the characteristic mechanical ...
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Radiofrequency microelectromechanical system (RF-MEMS) switches are utilized across a broad spectrum of industries, telecommunications, aerospace and smartphone technology.Herein, we proposed a new numerical and simulation analysis approach for spring constant (k) values as the characteristic mechanical parameters of RF MEMSs using the modified energy method (MEM). The proposed RF-MEMS switch was analyzed and simulated using the COMSOL package, and the findings confirmed that the alteration in the position and length (L) of the beams not only diminishes k significantly but also provides actuation-voltage VAC ultrasensitive structures and great concomitance between numerical and simulation k and VAC values. VAC value for the L-dependent numerical k (0.07 N m-1) was calculated to be 1.61 V which was validated with simulation outputs at 0.08 N m-1 and 1.80 V for k and VAC, respectively. Additionally, the switching time (ts), Von Mises Stress (VMS), natural frequency (fn) and mass (m) characteristic mechanical parameters were found to be 25.60 µs, 4.50 MPa, 3118.60 Hz , and0.21 ng, respectively. RF analysis was conducted in HFSS, revealing promising simulation results for the studied RF-MEMS switches. The return loss demonstrates excellent performance, registering better than -1 dB at 46 GHz. Furthermore, the insertion loss is noteworthy, exceeding expectations with values better than -0.7 dB at 46 GHz. Importantly, the isolation is impressive, exceeding -25 dB across the frequency range from 40 GHz to 35 GHz, all achieved with a modest actuation voltage of 1.8 V. This study contributes valuable insights intothe design and application of low-actuation-voltage RF-MEMS switches.
Research Articles
Power systems
Ramezan Havangi; Fatemeh Karimi
Abstract
Battery Management System (BMS) including measurements errors that causes decrease in the quality of calculated State of the Charge (SOC). It will limit the accurate estimation of the SOC that is a critical challenge in some of the engineering fields such as medical science, robotics, ...
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Battery Management System (BMS) including measurements errors that causes decrease in the quality of calculated State of the Charge (SOC). It will limit the accurate estimation of the SOC that is a critical challenge in some of the engineering fields such as medical science, robotics, navigation and industrial applications. These facts implies on the significance of SOC estimation from battery measurements that is the matter of the literature through the recent years. Due to the dependency of the EKF to the system model, the change in the battery parameters and noise information cause losing performance in the SOC estimation over the time. In this paper, we assume that the battery parameters including internal resistance and capacitor and also the noise information are varying over the time. To solve that, two separate on-line identification algorithms for parameters and noise information are introduced. In more details, a Recursive Least Square (RLS) algorithm is used to identify the resistance and capacitor values. Moreover, the process and measurement noise covariance are estimated based on iterative noise information identification algorithm. Then all of the updated values are used in the EKF algorithm. This paper aims to address the issue of uncertainty in SOC estimation by proposing two algorithms. The first algorithm focuses on identifying deterministic uncertainty, which refers to uncertainty in model parameters. To address the challenge of uncertain model parameters, RLS is introduced.
Research Articles
Electronics
Farzaneh Yousefzadeh Ahari; Mousa Yousefi; Khalil Monfaredi
Abstract
The essential reason for implementing multilevel processing systems is to reduce the number of semiconductor elements and hence the complexity of system. Multilevel processing systems are realized much easier by carbon nanotube field effect transistors (CNTFET) than MOSFET transistors due to the CNTFET ...
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The essential reason for implementing multilevel processing systems is to reduce the number of semiconductor elements and hence the complexity of system. Multilevel processing systems are realized much easier by carbon nanotube field effect transistors (CNTFET) than MOSFET transistors due to the CNTFET transistors' adjustable threshold voltage capabilities. In this paper, an efficient quaternary full-adder based on CNTFET technology is presented which consists of two half adder blocks, a quaternary decoder and a carry generator circuit. In the proposed architecture, the base-two and base-four circuit design techniques are combined to take the full advantages of both techniques namely simple implementation and low chip area occupation of the entire proposed quaternary full-adder. The proposed structure is evaluated using the Stanford 32nm CNTFET library in HSPICE software. The simulation results for the proposed full-adder structure utilizing a supply voltage of 0.9 volts, reveals the power consumption, propagation delay and energy index equal to 2.67 μW, 40 ps, and 10.68 aJ, respectively.
