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.
The main goal of this paper is to manage the switching on/off of servers in a data center during time to adapt the system with incoming traffic changes to ensure a good performance and a reasonable energy consumption. In this work, the system is modeled by a queue then, an optimization algorithm is designed to manage energy consumption and quality of service in the data center. For several systems,...
This paper present the parallelization of firefly algorithm for permutation routing in baseline multistage interconnection network. The proposed parallel firefly algorithm employs a self routing approach to route the permutation in baseline network. The objective of this paper is as follows (i) to improve serial firefly algorithm to parallel one for better utilization of multi core/ many core processor...
This paper presents techniques for increasing communication data rates for OOK modulated signals in the case the carrier frequency is generated by a cross-coupled pair LC oscillator. The proposed circuitry completely turns off the transmitter during the transmission of “0” bit and oscillation occurs only when the data bit is “1” to reduce power consumption. The data bit controls the steady state bias...
Four-level hybrid-clamped (4L-HC) inverter is a newly proposed topology which is suitable for high-performance medium-voltage drives. This paper proposes a multi-objective optimization strategy for this 4L-HC inverter. The central DC-link capacitor and flying capacitor voltages are regulated by a modified phase-shifted PWM. The upper and lower capacitor voltages are balanced by zero-sequence voltage...
Focused on the current problems which exist in nine-area control strategy, such as frequent operation of control equipment and low qualified rate of voltage, the theory of nine-area method is deeply analyzed, and a new optimal setting method of reactive power interval in nine-area figure is proposed. A math model of evaluation function based on one-day energy loss of network, one-day adjusting times...
Joint optimization of user association, resource allocation and Almost Blank Subframe (ABSF) based enhanced Inter-Cell Interference Coordination (eICIC), on which macro-cells mute for scheduling the pico users, is of great importance to further improve the network performance in HetNets, however, the introduce of ABSF makes analyzing resource allocation extremely difficult because this results in...
This paper introduces a rail length-limited parallel-coupled cart-pendulums system which is one of the morphs from the inverted pendulum family. A swing-up control strategy based on optimization algorithm (pattern search) instead of manual tuning has been proposed for such kind of system to swing the pendulums up cooperating with the original stabilizing controller. The blockset-view of the system...
This paper presents a few design considerations in implementing building block-based Computer Aided Design (CAD) for analog switched circuits. The considered synthesis include four independent levels: 1) system level, 2) building block level, 3) circuit simulation level, and 4) layout generation, which multistage can separate a larger size circuit into a few major basic building blocks. The aim of...
This paper deals with the model predictive control (MPC) of pulse-width modulated (PWM) systems. Hybrid models that predict the switched behaviour of PWM systems are investigated in order to formulate control objectives such as minimising the non-linear distortion or the power losses as it is typically desired in many power electronics applications. To obtain tractable problems, the PWM system dynamics...
This paper discusses the possibilities of an energy efficient use of compressed air in pneumatic drives such as cylinders in combination with switching valves. It presents a numerical optimization realization with which an energy optimal open loop control of standard pneumatic systems with switching valves is derived. The main part of air savings results from a better usage of the energy stored in...
This paper presents a study on an optimized controller for a switched reluctance generator (SRG) intended for variable-speed applications. The proposed optimization approach using “massive” simulation is described. Simulation results obtained with an 8/6 switched reluctance generator in a large range of operating conditions are presented and compiled into multidimensional tables that can be used as...
The matrix converter (MC) is a promising topology for various applications due to its intrinsic advantages. In this sense, this type of converter represent an alternative for small wind turbines (SWT). Simulation is necessary to validate the controllers and study the interaction of the wind farm with the grid, but this is not feasible using traditional simulation techniques. This work proposes the...
Based on ANSOFT software, the 2d and 3d finite element models of switch reluctance motor were established, the dynamic simulations on the switch reluctance motor finite element models were researched by different control strategies. The accuracy and precision of the finite element models were verified by comparing the finite element results with MATLAB simulation results. The results show that the...
Based on the analysis of distribution network service restoration with distributed generation(DGs), in this paper, it is pointed out that there are two deficiency in current research: First, when faults occur, only the power balance of the island is taken into consideration in spite of the calculation of power flow in the network after isolating the island and island itself and also the analysis of...
Simulation optimization refers to the iterative procedure in search of the optimal parameter when the objective function can only be evaluated by stochastic simulation. STRONG (Stochastic Trust Region Response Surface Convergent Method) is a newly developed design-of-experiments based simulation optimization method. It incorporates the idea of trust region method (TRM) for deterministic optimization...
In this paper, the performance assessment of the hybrid Archive-based Micro Genetic Algorithm (AMGA) on a set of bound-constrained synthetic test problems is reported. The hybrid AMGA proposed in this paper is a combination of a classical gradient based single-objective optimization algorithm and an evolutionary multi-objective optimization algorithm. The gradient based optimizer is used for a fast...
This paper presents Model predictive control (MPC) of nonlinear hybrid system based on neural network (NN) optimization. Multiple model method is used to modeling of nonlinear hybrid system and these models are combined using Bayes theorem. NN optimization combined gradient NN with recurrent NN is proposed to solve optimization problem of each sample time in MPC. An example of benchmark three spherical...
In this paper a BISR architecture for embedded memories is presented. The proposed scheme utilises a multiple bank cache-like memory for repairs. Statistical analysis is used for minimisation of the total resources required to achieve a very high fault coverage. Simulation results show that the proposed BISR scheme is characterised by high efficiency and low area overhead, even for high defect densities...
In this paper we propose a set of different configurations of failure recovery schemes, developed for network-on-chip (NoC) based systems. These configurations exploit the fact that communication in NoCs tends to be partitioned and eventually localized. The failure recovery approach is based on checkpoint and rollback and is aimed towards fast recovery from system or application level failures. The...
Current mode (CM) scheme provides suitable alternative for the high speed on-chip interconnect signaling. This paper presents a energy-delay optimization methodology for the current-mode (CM) signaling scheme. Optimization for the CM circuits for on-chip interconnects requires a joint optimization of driver and receiver device sizes, as their parameters which affect the energy-delay performance depend...
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.