Specification of fault-tolerant system issues by predicate/transition nets and regular expressions-approach and case study

1991 ◽  
Vol 17 (6) ◽  
pp. 513-526 ◽  
Author(s):  
F. Belli ◽  
K.-E. Grosspietsch
Keyword(s):  
Fault Tolerant ◽  
Regular Expressions ◽  
Fault Tolerant System

scholarly journals A Case Study of Self-Checking Circuits Reliability

VLSI Design ◽  
1998 ◽  
Vol 5 (4) ◽  
pp. 373-383 ◽  
Author(s):  
Jien-Chung Lo
Keyword(s):  
Fault Tolerant ◽  
The Self ◽  
Hardware Complexity ◽  
Error Handling ◽  
Fault Tolerant System ◽  
Trade Offs ◽  
Self Testing

In this paper, we analyze the reliability of self-checking circuits. A case study is presented in which a fault-tolerant system with duplicated self-checking modules is compared to the TMR version. It is shown that a duplicated self-checking system has a much higher reliability than that of the TMR counterpart. More importantly, the reliability of the self-checking system does not drop as sharply as that of the TMR version. We also demonstrate the trade-offs between hardware complexity and error handling capability of self-checking circuits. Alternative self-checking designs where some hardware redundancies are removed with the lost of fault-secure and/or self-testing properties are also studied.

scholarly journals Técnicas de Tolerância a Falhas em uma Plataforma para Prototipagem Rápida Usando Microcontroladores

2019 ◽  
Author(s):  
Kleber Kruger ◽  
Fabio Iaione
Keyword(s):  
Fault Tolerance ◽  
Power Consumption ◽  
Rapid Prototyping ◽  
System Performance ◽  
Processing Time ◽  
Fault Tolerant ◽  
Weather Station ◽  
Fault Tolerant System ◽  
Sram Memory

This paper describes the implementation of fault tolerance techniques (based on data and processing redundancy) in programming of a rapid prototyping platform using microcontrollers. To evaluate performance of these techniques was used a fault injector software and a weather station system as a case study. Experiments simulated faults in sensor readings and faults in SRAM memory regions of the weather station. Finally, the fault-tolerant system performance is presented in comparison with non-fault-tolerant system, considering incidence of failures, processing time, memory and power consumption.

Case study on distributed and fault tolerant system modeling based on timed automata

2009 ◽  
Vol 82 (10) ◽  
pp. 1678-1694 ◽  
Author(s):  
Libor Waszniowski ◽  
Jan Krákora ◽  
Zdeněk Hanzálek
Keyword(s):  
Fault Tolerant ◽  
Timed Automata ◽  
System Modeling ◽  
Fault Tolerant System

ESP corpus design: compilation of the Veterinary Nursing Medical Chart Corpus and the Veterinary Nursing Wordlist

Corpora ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 125-140
Author(s):  
Yukiko Ohashi ◽  
Noriaki Katagiri ◽  
Katsutoshi Oka ◽  
Michiko Hanada
Keyword(s):  
Word List ◽  
English For Specific Purposes ◽  
Regular Expressions ◽  
Annotation Scheme ◽  
Corpus Design ◽  
As Species ◽  
Lexical Items ◽  
Access To Data ◽  
General Service

This paper reports on two research results: ( 1) designing an English for Specific Purposes (esp) corpus architecture complete with annotations structured by regular expressions; and ( 2) a case study to test the design to cater for creating a specific vocabulary list using the compiled corpus. The first half of this study involved designing a precisely structured esp corpus from 190 veterinary medical charts with a hierarchy of the data. The data hierarchy in the corpus consists of document types, outline elements and inline elements, such as species and breed. Perl scripts extracted the data attached to veterinary-specific categories, and the extraction led to creating wordlists. The second part of the research tested the corpus mode, creating a list of commonly observed lexical items in veterinary medicine. The coverage rate of the wordlists by General Service List (gsl) and Academic Word List (awl) was tested, with the result that 66.4 percent of all lexical items appeared in gsl and awl, whereas 33.7 percent appeared in none of those lists. The corpus compilation procedures as well as the annotation scheme introduced in this study enable the compilation of specific corpora with explicit annotations, allowing teachers to have access to data required for creating esp classroom materials.

Fault-Tolerant Strategy for Real-Time System Based on Evolvable Hardware

2017 ◽  
Vol 26 (07) ◽  
pp. 1750111 ◽  
Author(s):  
Jie Wang ◽  
Jiwei Liu
Keyword(s):  
Real Time ◽  
Recovery Time ◽  
Fault Tolerant ◽  
Fault Tree Analysis ◽  
Repair Process ◽  
Evolvable Hardware ◽  
Target System ◽  
Time System ◽  
Real Time System ◽  
Fault Tolerant System

The evolvable hardware (EHW) is widely used in the design of fault-tolerant system. Fault-tolerant system is really a real-time system, and the recovery time is necessary in fault detection and recovery. However, when applying EHW, real-time characteristic is usually ignored. In this paper, a fault-tolerant strategy based on EHW is proposed. The recovery time, predicted by the fault tree analysis (FTA), is considered as a constraint condition. A configuration library is set up in the design phase to accelerate the repair process of the anticipated faults. An evolvable algorithm (EA) based on similarity is applied to evolve the repair circuit for the unanticipated faults. When the library reaches the upper, the target system is reconfigured by the EA-repair technology. Extensive experiments are conducted to show that our method can improve the fault-tolerance of the system while satisfying the real-time requirement on FPGA platform. In a long run system, our method can keep a higher fault recovery rate.

RT-ZooKeeper: Taming the Recovery Latency of a Coordination Service

2021 ◽  
Vol 20 (5s) ◽  
pp. 1-22
Author(s):  
Haoran Li ◽  
Chenyang Lu ◽  
Christopher D. Gill
Keyword(s):  
Fault Tolerant ◽  
Empirical Evaluation ◽  
Distributed Applications ◽  
Edge Computing ◽  
Challenges And Opportunities ◽  
Cloud Environments ◽  
Hand Coordination ◽  
Recovery Protocols ◽  
Recovery Latency

Fault-tolerant coordination services have been widely used in distributed applications in cloud environments. Recent years have witnessed the emergence of time-sensitive applications deployed in edge computing environments, which introduces both challenges and opportunities for coordination services. On one hand, coordination services must recover from failures in a timely manner. On the other hand, edge computing employs local networked platforms that can be exploited to achieve timely recovery. In this work, we first identify the limitations of the leader election and recovery protocols underlying Apache ZooKeeper, the prevailing open-source coordination service. To reduce recovery latency from leader failures, we then design RT-Zookeeper with a set of novel features including a fast-convergence election protocol, a quorum channel notification mechanism, and a distributed epoch persistence protocol. We have implemented RT-Zookeeper based on ZooKeeper version 3.5.8. Empirical evaluation shows that RT-ZooKeeper achieves 91% reduction in maximum recovery latency in comparison to ZooKeeper. Furthermore, a case study demonstrates that fast failure recovery in RT-ZooKeeper can benefit a common messaging service like Kafka in terms of message latency.

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