
Electronic Engineering and Computing Technology
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Electronic Engineering and Computing Technology contains sixty-one revised and extended research articles written by prominent researchers participating in the conference. Topics covered include Control Engineering, Network Management, Wireless Networks, Biotechnology, Signal Processing, Computational Intelligence, Computational Statistics, Internet Computing, High Performance Computing, and industrial applications. Electronic Engineering and Computing Technology will offer the state of art of tremendous advances in electronic engineering and computing technology and also serve as an excellent reference work for researchers and graduate students working with/on electronic engineering and computing technology.
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Kashif Hameed, RobWilliams, and Jim Smith
Abstract Software fault tolerance demands additional tasks like error detection and recovery through executable assertions, exception handling, diversity and redundancy based mechanisms. These mechanisms do not come for free; rather they introduce additional complexity to the core functionality. This paper presents light weight error detection and recovery mechanisms based on the rate of change in signal or data values. Maximum instantaneous and mean rates are used as plausibility checks to detect erroneous states and recover. These plausibility checks are exercised in a novel aspect oriented software fault tolerant design framework that reduces the additional logical complexity. A Lego NXT Robot based case study has been completed to demonstrate the effectiveness of the proposed design framework.
Keywords Aspect oriented design and programming - executable assertions - exception handling - fault tolerance - plausibility checks
14.1 Introduction
Adding fault tolerance measures to safety critical and mission critical applications introduces additional complexity to the core application. By incorporating handler code, for error detection, checkpointing, exception handling, and redundancy/ diversity management, the additional complexity may adversely affect the dependability of a safety critical or mission critical system. One of the solutions to reduce this complexity is to separate and modularize the extra, cross-cutting concerns from the true functionality. At the level of design and programming, several approaches have been utilized that aim at separating functional and non-functional aspects.
Component level approach like IFTC [1], computational reflection and meta-object protocol based MOP [2] have shown that dependability issues can be implemented independently of functional requirements. The evolving area of Aspect-Oriented Programming & Design (AOP&D) presents the same level of independence by supporting the modularized implementation of crosscutting concerns. Aspect-oriented language extensions, like AspectJ [3] and AspectCCC [4] provide mechanisms like Advice (behavioural and structural changes) that may be applied by a pre-processor at specific locations in the program called join point.
These are designated by pointcut expressions. In addition to that, static and dynamic modifications to a program are incorporated by slices which can affect the static structure of classes and functions. In the context of fault tolerance, an induced fault can activate an error that changes the behaviour of the program and may lead to system failure. In order to tolerate a fault, abnormal behaviour must be detected and transformed back by introducing additional behaviour changes (Exception Handler) or alternate structure adoption (Recovery Blocks, N-Version Programming) strategies."
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