Volume 18, Issue 2 (June 2022)  

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Abstract (2145 Views) | Full-Text (PDF) (1283 Downloads)   |   Highlights
  • This paper presents sparse representation and dictionary design in the segmentation of echocardiographic image sequences.
  • The presented method is based on sparse representation and the design of over-complete dictionaries based on prior knowledge of the intensity variation time curves (IVTC).
  • The extrapolations from ejection fraction calculated from the segmentation results are entirely compatible with manual results.
  • The proposed method can be applied in combination with other techniques of echocardiography images diagnosis to obtain highly accurate computation of the parameters.
  • The proposed method can be applied to 3D echocardiography images to obtain the left ventricular volume.
  • Our method also may be used for other imaging modalities, such as MRI or CT.

| Video 9. Original second healthy dataset [ZIP]  (183 Download) | Video 10. Surface changes in second healthy-Proposed method [ZIP]  (131 Download)

Abstract (1898 Views) | Full-Text (PDF) (943 Downloads)   |   Highlights
  • Determination and classification of various nonlinear behaviors of mechanical loads in industrial electrical machine drives;
  • investigations into the effects of nonlinear loads on transient and steady-state responses of vector-controlled induction motor drives;
  • Introducing methods of modeling nonlinear dynamics and fast torque variations of industrial loads which are necessary for designing and developing dynamometers with large bandwidths.

Abstract (1639 Views) | Full-Text (PDF) (985 Downloads)   |   Highlights
  • Adaptive droop coefficient approach for balanced power sharing;
  • Uncertainty modeling of load and DG power for more robust control of frequency and voltage;
  • Three different types of uncertainty (Norm 1, Norm 2, and infinite norm) consideration and analysis of the performance of the system using conventional and adaptive droop methods.

Abstract (1520 Views) | Full-Text (PDF) (1023 Downloads)   |   Highlights
  • The number of the integer and fractional bits are determined by MATLAB simulation;
  • High throughput and low latency for CORDIC-based modified Gram-Schmidt algorithm for QR decomposition;
  • The number iterative of the CORDIC algorithm and unrolling coefficient is optimized for high throughput and low resource and latency.

Abstract (1541 Views) | Full-Text (PDF) (752 Downloads)   |   Highlights
  • A novel non-entropic objective function is proposed.
  • A novel non-entropic method for multilevel optimal threshold selection is proposed.
  • The performances are compared with the state-of-the-art entropic value-based method used for multilevel threshold assortment and are found better.

Abstract (1578 Views) | Full-Text (PDF) (866 Downloads)   |   Highlights
  • Dynamic sensitization conditions for 2:1 ternary multiplexers presented (that are used in constructing the ternary circuits) are introduced.
  • A dynamic programming procedure for identifying the true and false paths of the circuit by using static timing analysis is proposed.
  • An event-driven simulation engine is introduced that is utilized in confirming the sensitization state of the identified paths.
  • Carry skip adders, which are known to have many false paths, in addition to some other arithmetic circuits are designed by ternary logic as benchmark circuits to depict the effectiveness of the proposed identification algorithm in finding the true and false paths of the circuit.

Abstract (2078 Views) | Full-Text (PDF) (911 Downloads)   |   Highlights
  • Including the wind curtailment cost in the risk-constrained TEP problem;
  • Modeling the proposed framework in the form of a risk-constrained stochastic bi-level problem;
  • Formulating the model as MILP.

Abstract (1913 Views) | Full-Text (PDF) (1159 Downloads)   |   Highlights
  • This paper proposes a grid-connected single-phase micro-inverter (MI) with a rated power of 300 W and an appropriate control strategy for photovoltaic (PV) systems.
  • In the proposed MI, the active power decoupling circuit, which is normally used in a typical single-stage SEPIC-based MI, is eliminated to achieve both a long lifetime and high efficiency.
  • The advantages of the proposed MI are the use of fewer components to provide suitable output voltage level for connection to a single-phase network, continuous input current, limited voltage stress on the switch, high efficiency, long operational lifetime, and high reliability.
  • Lower input current ripple and the presence of film capacitors in the power decoupling circuit increase the lifetime and reliability of the proposed MI.
  • The performance of the proposed control system was verified with the purposes of harvesting maximum PV power, stabilizing the DC-link voltage, injecting low THD sinusoidal current into the grid, and controlling the active power injected into the grid at unity power factor.
  • Moreover, the performance of the proposed control system was studied for a sudden change in solar radiation.

Abstract (1465 Views) | Full-Text (PDF) (1077 Downloads)   |   Highlights
  • The probability of the back flashover was done for various soil resistivities and grounding ‎systems.
  • Extensive analysis was carried out to study the EGLA absorbed energy.
  • EGLA ‎expected life has been calculated by the Mont-Carlo method.

Abstract (1700 Views) | Full-Text (PDF) (986 Downloads)   |   Highlights
  • A closed-form relation is derived for the CFL condition in bounded inhomogeneous anisotropic media.
  • The proposed theory can take into account the effect of straight, tilted or curved boundaries on the stability of the FDTD time ma
  • It is shown that for some ranges of permittivities and unit cell aspect ratios, the von-Neumann criterion is not able to predict the CFL time step.

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© 2022 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.