Grid-based switch fabrics: a new approach in designing fault-tolerant ATM switches

2001 ◽  
Vol 24 (15-16) ◽  
pp. 1589-1606 ◽  
Author(s):  
H.S. Laskaridis ◽  
A.A. Veglis ◽  
G.I. Papadimitriou ◽  
A.S. Pombortsis
Keyword(s):  
Fault Tolerant ◽  
New Approach ◽  
Switch Fabrics ◽  
Atm Switches ◽  
Grid Based

Hydrological modelling and anthropogenic water use

2021 ◽  
Author(s):  
Ponnambalam Rameshwaran ◽  
Ali Rudd ◽  
Vicky Bell ◽  
Matt Brown ◽  
Helen Davies ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Use ◽  
Hydrological Model ◽  
Model Performance ◽  
River Flows ◽  
Discharge Data ◽  
New Approach ◽  
Water Demands ◽  
The Impact ◽  
Grid Based

<p>Despite Britain’s often-rainy maritime climate, anthropogenic water demands have a significant impact on river flows, particularly during dry summers. In future years, projected population growth and climate change are likely to increase the demand for water and lead to greater pressures on available freshwater resources.</p><p>Across England, abstraction (from groundwater, surface water or tidal sources) and discharge data along with ‘Hands off Flow’ conditions are available for thousands of individual locations; each with a licence for use, an amount, an indication of when abstraction can take place, and the actual amount of water abstracted (generally less than the licence amount). Here we demonstrate how these data can be used in combination to incorporate anthropogenic artificial influences into a grid-based hydrological model. Model simulations of both high and low river flows are generally improved when abstractions and discharges are included, though for some catchments model performance decreases. The new approach provides a methodological baseline for further work investigating the impact of anthropogenic water use and projected climate change on future river flows.</p>

Performance of fault tolerant ATM switches

1996 ◽  
Vol 143 (5) ◽  
pp. 317 ◽  
Author(s):  
P.U. Tagle ◽  
N.K. Sharma
Keyword(s):  
Fault Tolerant ◽  
Atm Switches

Harmonic Detection in Micro-Grid Based on Modified S-Transform

2014 ◽  
Vol 568-570 ◽  
pp. 270-273 ◽  
Author(s):  
Guan Qi Liu ◽  
Li Na Wu
Keyword(s):  
Harmonic Signal ◽  
Frequency Resolution ◽  
Harmonic Detection ◽  
New Approach ◽  
Time Frequency ◽  
Feature Vectors ◽  
S Transform ◽  
Attractive Candidate ◽  
Micro Grid ◽  
Grid Based

The excellent time–frequency resolution of the modified S-transform (MST) makes it an attractive candidate for analysis and detection of harmonic in micro-grid. This paper presents a new approach for micro-grid harmonic detection based on the MST. Firstly, the MST was performed for the harmonic signal, and then the feature vectors were extracted from the resulting time-frequency matrix. Finally, the frequency, amplitude and phase of the harmonic were obtained by analyzing and processing these feature vectors. Simulation results show that the proposed approach can detect the harmonic in micro-grid with high accuracy and strong noise immunity.

scholarly journals Performance evaluation based fault tolerant control with actuator saturation avoidance

2011 ◽  
Vol 21 (3) ◽  
pp. 457-466 ◽  
Author(s):  
Boumedyen Boussaid ◽  
Christophe Aubrun ◽  
Mohamed Abdelkrim ◽  
Mohamed Gayed
Keyword(s):  
Performance Evaluation ◽  
Actuator Saturation ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Reference Trajectory ◽  
New Approach ◽  
System A ◽  
Loop Dynamics ◽  
Predictive Controller ◽  
Management Techniques

Performance evaluation based fault tolerant control with actuator saturation avoidanceIn this paper, a new approach regarding a reconfigured system is proposed to improve the performance of an active fault tolerant control system. The system performance is evaluated with an intelligent index of performance. The reconfiguration mechanism is based on a model predictive controller and reference trajectory management techniques. When an actuator fault occurs in the system, a new degraded reference trajectory is generated and the controller calculates new admissible controls. A constraint set and cost function are established to avoid actuator saturation and reduce the control energy spent in closed loop dynamics. The effectiveness of the proposed method is illustrated using a hydrothermal system subject to actuator faults and constraints on actuator dynamic ranges.

scholarly journals A New Approach to Detecting and Correcting Single and Multiple Errors in Wireless Sensor Networks

2021 ◽  
pp. 27-43
Author(s):  
Yakubu Abdul-Wahab Nawusu ◽  
Alhassan Abdul-Barik ◽  
Salifu Abdul-Mumin
Keyword(s):  
Wireless Sensor Networks ◽  
Data Transmission ◽  
Communication Systems ◽  
Fault Tolerant ◽  
Number System ◽  
Residue Number System ◽  
Wireless Sensor ◽  
New Approach ◽  
Transmission Errors ◽  
Residue Number

Transmission errors are commonplace in communication systems. Wireless sensor networks like many other communication systems are susceptible to various forms of errors arising from sheer noise, heat and interference in sensor circuitry and from other forms of distortions. Research efforts in WSN have attempted to guarantee reliable and accurate data transmission from a target environment in the midst of these unwanted exposures. Many techniques have appeared and employed over the years to deal with the issue of transmission errors in communication systems. In this paper we present a new approach for single and multiple error control in WSN relying on the inherent fault tolerant feature of the Redundant Residue Number System. As an off shoot of Residue Number System, RRNS's fault tolerant capabilities help in building robust systems required for reliable data transmission in WSN systems. The Chinese Remainder Theorem and the Manhattan Distance Heuristics are used during the integer recovery process when detecting and correcting error digit(s) in a transmitted data. The proposed method performs considerably better in terms of data retrieval time than similar approaches by needing a smaller number of iterations to recover an originally transmitted data from its erroneous form. The approach in this work is also less computationally intensive compared to recent techniques during the error correction steps. Evidence of utility of the technique is illustrated in numerical examples.

scholarly journals A Fault Tolerant Control for Sensor and Actuator Failures of an Non Linear Hybrid System

2018 ◽  
Vol 8 (5) ◽  
pp. 2864
Author(s):  
Chalandi Hanene ◽  
Ben Slimane Jihane ◽  
Ksouri Moufida
Keyword(s):  
Linear Systems ◽  
Hybrid System ◽  
Fault Tolerant ◽  
Main Idea ◽  
Fault Tolerant Control ◽  
New Approach ◽  
Actuator Failures ◽  
Research Activities ◽  
Non Linear ◽  
Diagnosis Method

<p>We focused in this work on a fault tolerant control of a non linear hybrid system class based on diagnosis method (determine and locate the defects and their types) and on the faults reconfiguration method.In literature we can found many important research activities over the fault-tolerant control of non linear systems and linear Hybridsystems. But it dosen´t exist too many for the non linear hybridsystem.The main idea in this paper is to consider a new approach to improve the reconfiguration performance of the non linear hybrid system by using hammerstein method which is designed to works only for linear systems. This method compensated the effect of the faults and guarantees the closed-loop system stable. The proposed method is simulated with a hydraulic system of two tanks with 4 modes.</p>

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