The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Nowadays, Rate-Distortion Optimization (RDO) is commonly used in hybrid video coding to maximize coding efficiency. Usually, the rate distortion tradeoff is explicitly computed in offline encoder implementations whereas R(D) model are used in live encoders to select the best decisions at a lower computational cost. For sake of simplicity, this (mathematical) modelling is often performed for each coding...
This paper deals with fault tolerant control of a sinusoidal EMF five-phase permanent-magnet synchronous generator (PMSG) connected to an AC-DC converter without neutral connection. Under one open phase condition, the proposed global method is based on an original approach optimization problem minimizing copper losses and cancelling torque ripples. The used optimization algorithm is based to a Particle...
Packages of commercial Gallium-Nitride power semiconductors present increasingly small dimensions to enable low parasitic inductance, increasing the heat flux density of the package and the challenges associated with their thermal management. This paper compares between Printed Circuit Boards and Direct Copper Bonded as substrates for a Gallium Nitride based half-bridge from a thermal and reliability...
High motor saliency is required to increase the power density, and to reduce the use of permanent magnets (PM). It is a common practice to reduce the d-axis inductance (Ld) as much as possible to obtain a high saliency ratio. But, we should look at the loss in the motor operation stage. Specifically in the field weakening region, a big negative d-axis current needs to be supplied to satisfy the voltage...
We examine graphene for interconnects within a 7-nm FinFET technology. Multiple scenarios considered alter dimensions and/or materials to reflect realistic graphene interconnect fabrication. Replacement is restricted up to the 3rd BEOL metal layer (M3) as graphene is advantageous over copper in terms of resistivity only for line widths < 30 nm. Initial standard-cell level analysis is extended to...
The RC delay, electro migration (EM) and TDDB performance become more challenges to meet device requirement as continuous geometry shrink on BEOL dual damascene interconnects. To overcome these challenges from interconnect patterning point of view, we proposed Cu subtractive RIE as a potential solution for next generation Cu/Low-k interconnects.
This paper proposes a method based on the quadratic programming (QP) sequence for solving loss-minimizing current, which yields minimum loss of motor, of control system for interior permanent magnet synchronous motor (IPMSM) of electric vehicle. First, the efficiency optimization of IPMSM is modeled as a constrained programming problem, and then transformed it into linear constraint QP sequence. The...
In this paper, power allocation for device-to-device (D2D) communication underlaying cellular networks is investigated. Our optimization task is to maximize the sum rate of the cellular link and the D2D link subject to the maximum power budget and intercell interference constraints. An efficient iterative algorithm is proposed to address the formulated intractable problem, to which the global optimum...
Recent MPEG video compression standards are still block-based: blocks of pixels are sequentially coded using spatial or temporal prediction schemes. For each block, a vector of coding parameters has to be selected. In order to limit the complexity of this decision, independence between blocks is assumed, and coding parameters are locally optimized to maximize the coding efficiency. Few studies have...
Switched reluctance generators (SRG) are a promising solution for back-up power generation for renewable energy or in electric vehicles. Classic approaches suggest choosing single pulse control angles to minimize dc-link rms current or excitation penalty to maximize system efficiency. Those publications only investigate the effect of turn-on angle θon and turn-off angle θoff. The influence of an additional...
Large offshore direct-drive wind turbines of 10-MW power levels are being extensively proposed and studied because of a reduced cost of energy. Conventional permanent magnet generators currently dominating the direct-drive wind turbine market are still under consideration for such large wind turbines. In the meantime, superconducting generators (SCSGs) have been of particular interest to become a...
This study aims to optimally set the operational parameters of pulsed green laser welding with copper. Multi input parameters and critical-to-quality outputs were considered. The chosen inputs were power, pulse duration and pressured air flow, while the outputs were the maximum force handled by the welding joint and the penetration level of the laser weld. Design and analyses for single-response and...
In this paper, five different nanoantenna structures, i.e. dipole, bowtie, rounded bowtie, rounded cross bowtie and cross bowtie nanoantennas are investigated for solar energy harvesting. Electrical field enhancement by each structure is investigated when different metals (silver, aluminum, gold, and copper) are used to achieve the best performance for solar energy harvesting. Field enhancement in...
Recently, ITU finished its standard for G.fast, utilized in so called fiber-to-the-distribution-point (FTTdp) networks, where only the last meters from the fiber link to the customer are bridged by existing copper wires. The target is to increase the data rate over the short copper link up to 1 Gbit/s, which is an increase by the factor of ten compared to VDSL2, by extending the frequency band up...
The aim of this paper is to optimize the performances of an Interior Permanent Magnet Synchronous Machine (IPMSM) for an Electric Vehicle application. The originality of this work concerns the use of a Reluctance Network (RN) method which furnishes the harmonics of output parameters (i.e. torque and back-emf) and automatically generates the derivative of the model. Then, precise and very fast optimizations...
Laminated busbars acquire significant importance even if they are a passive component in converters. Their flat and overlapped conducting layers allow good heat dissipation and reduced stray inductance. Topology optimization enables balancing the amount of copper used with the maximum temperature and stray inductance of the busbar.
This paper focuses on the power optimization problem for the max-min fairness of energy efficiency (EE) among cognitive users (CUs) in an underlay massive multiple-input multiple-output (MIMO) cognitive radio network (CRN). We formulate this problem as the maximization of the minimum EE of CUs, subject to their minimum data rate requirements and transmit power constraints. However, the problem is...
For the downlink device-to-device (D2D) communication underlaying cellular networks, we study the resource allocation policy which jointly optimizes the resource block (RB) assignment and the powers of D2D users and cellular users. Aiming to improve the sum-rate of D2D subsystem and ensure the quality of service (QoS) of the cellular networks, a nominal optimization problem is formulated. Furthermore,...
In order to improve data rate and spectrum utilization of cognitive device-to-device (D2D) communications, in this work we propose a hybrid mode D2D communication network and study resource allocation which maximizes the sum rate under the rate constraint for the primary cellular users. First of all, the subchannels mainly occupied by the cellular system are divided into occupied and empty channels...
Packages of power semiconductors have considerable influence regarding the thermal impedance, the parasitic inductance, which affects the switching losses, and the reliability. In this paper, the performance of a phase leg of a PFC rectifier with PCB embedded power semiconductors is investigated. The mechanical stress in the PCB is analyzed by a FEM simulation and PCB design guidelines are given....
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.