Resilient and Timely Event Dissemination in Publish/Subscribe Middleware

2012 ◽  
pp. 1-20
Author(s):  
Christian Esposito ◽  
Domenico Cotroneo
Keyword(s):  
Fault Tolerant ◽  
Multicast Tree ◽  
Temporal Constraints ◽  
Multicast Protocol ◽  
Message Dissemination ◽  
Increasing Demand ◽  
To Receive

Recently we have witnessed an increasing demand of fault-tolerant communications in publish/subscribe middleware. Although several reliable solutions have been proposed, none of them address the problem of achieving a resilient and timely event dissemination. We investigate how guaranteeing assured message dissemination despite occurrence of network faults without breaking temporal constraints. The contribution of this article is on devising a FEC approach where encoding functionality is placed at the root and on a subset of interior nodes in the multicast tree. Simulations-based experiments demonstrate that the proposed approach allows all the interested subscribers to receive all the published messages and the adopted resiliency mean does not affect the performance of the multicast protocol.

Resilient and Timely Event Dissemination in Publish/Subscribe Middleware

2010 ◽  
Vol 1 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Christian Esposito ◽  
Domenico Cotroneo
Keyword(s):  
Fault Tolerant ◽  
Multicast Tree ◽  
Temporal Constraints ◽  
Multicast Protocol ◽  
Message Dissemination ◽  
Increasing Demand ◽  
To Receive

Recently we have witnessed an increasing demand of fault-tolerant communications in publish/subscribe middleware. Although several reliable solutions have been proposed, none of them address the problem of achieving resilient and timely event dissemination. We investigate how guaranteeing assured message dissemination despite occurrence of network faults without breaking temporal constraints. The contribution of this article is on devising a FEC approach where encoding functionality is placed at the root and on a subset of interior nodes in the multicast tree. Simulations-based experiments demonstrate that the proposed approach allows all the interested subscribers to receive all the published messages and the adopted resiliency mean does not affect the performance of the multicast protocol.

scholarly journals Commercial Aircraft Electrification—Current State and Future Scope

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8381
Author(s):  
Liya Tom ◽  
Muhammad Khowja ◽  
Gaurang Vakil ◽  
Chris Gerada
Keyword(s):  
Fault Tolerant ◽  
Cooling System ◽  
High Strength ◽  
Hydraulic Systems ◽  
Commercial Aircraft ◽  
Future Design ◽  
Current State ◽  
Electric Aircraft ◽  
Increasing Demand ◽  
Drive Systems

Electric and hybrid-electric aircraft propulsion are rapidly revolutionising mobility technologies. Air travel has become a major focus point with respect to reducing greenhouse gas emissions. The electrification of aircraft components can bring several benefits such as reduced mass, environmental impact, fuel consumption, increased reliability and quicker failure resolution. Propulsion, actuation and power generation are the three key areas of focus in more electric aircraft technologies, due to the increasing demand for power-dense, efficient and fault-tolerant flight components. The necessity of having environmentally friendly aircraft systems has promoted the aerospace industry to use electrically powered drive systems, rather than the conventional mechanical, pneumatic or hydraulic systems. In this context, this paper reviews the current state of art and future advances in more electric technologies, in conjunction with a number of industrially relevant discussions. In this study, a permanent magnet motor was identified as the most efficient machine for aircraft subsystems. It is found to be 78% and 60% more power dense than switch-reluctant and induction machines. Several development methods to close the gap between existing and future design were also analysed, including the embedded cooling system, high-thermal-conductivity insulation materials, thin-gauge and high-strength electrical steel and integrated motor drive topology.

scholarly journals Peer to Peer Cloud Providers Federation

2019 ◽  
Vol 8 (1) ◽  
pp. 59-69
Author(s):  
Nourah Fahad Janbi Nourah Fahad Janbi
Keyword(s):  
Service Providers ◽  
Fault Tolerant ◽  
Peer To Peer ◽  
Cloud Services ◽  
Management Framework ◽  
Cloud Federation ◽  
Cloud Providers ◽  
Usage Cost ◽  
Increasing Demand ◽  
Cloud Elasticity

The increasing demand of the cloud services and with the emergence of many could service providers, the need for cloud federation is inevitable. In cloud federation, many could services providers are collaborating with each other to improve the resources usage, cost, quality of service they provide. To form this federation a management framework is required to facilitate the communication between these providers. This framework can be centralized or distributed, distributed Peer to Peer cloud federation improve extensibility, scalability and fault-tolerant. On the other hand, it is challenging in term of complexity, security and manageability of the federation. In this paper we propose a fully distributed P2P Cloud Federation (PPCF) architecture. PPCF provide a way to connect heterogenous cloud providers to share resources and improve the cloud elasticity. The architecture combines different software technologies to fulfil the cloud federation requirements.

scholarly journals High-Performance and Energy-Efficient Fault Tolerance FPGA-to-FPGA Communication

2021 ◽  
Author(s):  
Naresh Kumar Reddy ◽  
Swamy Cherukuru ◽  
Veena Vani ◽  
Vishal Reddy
Keyword(s):  
Error Detection ◽  
High Speed ◽  
High Performance ◽  
Fault Tolerant ◽  
Key Factors ◽  
Error Detection And Correction ◽  
Performance Error ◽  
Increasing Demand ◽  
Accuracy Performance ◽  
Or Applications

Abstract These days, due to the increasing demand for high speed and parallel computation, several real world applications and systems include multiple FPGAs in them. Due to this, FPGAs often need to communicate among them. So, communication between the FPGAs is one of the key factors that determines the accuracy, performance and correctness of the entire multiple FPGAs systems or applications. This paper presents the design of an efficient multi-bit fault tolerant communication system for FPGA-to-FPGA communication. The proposed design is synthesized and also simulated through Vivado design suit 2018.3 and was communicated with two Kintex-7 FPGA boards. When compared with the existing FPGA-to-FPGA communication and inter FPGA communication designs, the proposed design have higher performance, error detection and correction capability.

scholarly journals Energy-Efficient Adaptive Geosource Multicast Routing for Wireless Sensor Networks

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Daehee Kim ◽  
Sejun Song ◽  
Baek-Young Choi
Keyword(s):  
Energy Efficient ◽  
Multicast Routing ◽  
Geographic Location ◽  
Computation Time ◽  
Multicast Tree ◽  
Location Information ◽  
Common Source ◽  
Multicast Protocol ◽  
Multicast Protocols ◽  
Forwarding Node

We propose an energy-efficient adaptive geosource multicast routing (EAGER) for WSNs. It addresses the energy and scalability issues of previous location based stateless multicast protocols in WSNs. EAGER is a novel stateless multicast protocol that optimizes location-based and source-based multicast approaches in various ways. First, it uses the receiver's geographic location information to save the cost of building a multicast tree. The information can be obtained during the receiver's membership establishment stage without flooding. Second, it reduces packet overhead, and in turn, energy usage by encoding with a small sized node ID instead of potentially large bytes of location information and by dynamically using branch geographic information for common source routing path segments. Third, it decreases computation overhead at each forwarding node by determining the multicast routing paths at a multicast node (or rendezvous point (RP)). Our extensive simulation results validate that EAGER outperforms existing stateless multicast protocols in computation time, packet overhead, and energy consumption while maintaining the advantages of stateless protocols.

scholarly journals Fault Tolerant - Optimal Resource Allocator for Cloud

2019 ◽  
Vol 8 (4) ◽  
pp. 2565-2571
Keyword(s):  
Resource Allocation ◽  
Fault Tolerant ◽  
Vital Role ◽  
Optimal Resource Allocation ◽  
Allocation Policy ◽  
Content Delivery Networks ◽  
Optimal Resource ◽  
Increasing Demand ◽  
Delivery Networks ◽  
Resource Allocation Policy

Cloud Computing is mainly attracted by people for its unlimited storage space and worldwide accessibility from anywhere and anytime. The data that is stored in the cloud has to be retrieved in a faster manner as well as without any faults. Content Delivery Networks dominates Cyberspace traffic heavily due to its increasing demand. Resource allocation plays a vital role in determining the performance of the cloud. Over allocation leads to wastage which can be used for instances that are running short of resources. This work proposes an optimal resource allocation through Genetic algorithm. They help in increasing the download speed which in turn would be helpful in controlling traffic to greater extent. Recently cloud downloading Services have been emerged, in which cloud storage hoards the user interested content and updates the cloud cache. This process takes place in two modes, server mode and the helper mode. The proposed Resource Allocation Policy can well support the server mode of processing by the way it can increment the download speed with dynamic load balancing and fault tolerance.

scholarly journals CURRENT STATUS OF CONTROL STRATEGIES IN ENERGY RECOVERY SYSTEMS IN ELECTRIC VEHICLES

10.6036/10134 ◽  
2022 ◽  
Vol 97 (1) ◽  
pp. 58-63
Author(s):  
Juan Carlos Nuñez Dorantes ◽  
ALBINO MARTINEZ SIBAJA ◽  
JOSE PASTOR RODRIGUEZ JARQUIN ◽  
OSCAR OSVALDO SANDOVAL GONZALEZ ◽  
RUBEN POSADA GOMEZ ◽  
...  
Keyword(s):  
Control Systems ◽  
Electric Vehicles ◽  
Energy Recovery ◽  
Active Fault ◽  
Fault Tolerant ◽  
Control Strategies ◽  
Fault Tolerant Control ◽  
Current Status ◽  
Increasing Demand ◽  
Safety And Stability

There is currently an increasing demand for electric vehicles that require greater autonomy and energy efficiency when driving them. Control strategies in energy recovery systems are crucial to optimize the amount of energy returned to the battery and to ensure safety and stability for the user. In this paper, active fault tolerant control systems (AFTC) and passive fault tolerant control systems (PFTC) with other specialized control strategies (Fuzzy Logic, Neural Networks and Perturbation Rejection Controllers) are compared with classical PID controllers.The results of the simulations show that, keeping the battery voltage constant, returns of about 12% of the battery charge capacity are achieved while the braking time of the vehicles is reduced.

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