Prof Julian Bass' Outputs (144)

Towards a control software design environment using a meta-modelling technique (2002)
Presentation / Conference Contribution

The novelty of this paper is mainly the integration of multi-disciplinary software tools into a control software design environment, namely the Integrated Design Notation (IDN). The IDN supports the design, development and implementation of decentral... Read More about Towards a control software design environment using a meta-modelling technique.

Voting algorithms in multiple error scenarios for real-time control applications (2002)
Presentation / Conference Contribution

Voting algorithms are used to arbitrate between the variant results in fault tolerant systems. Traditional voters produce incorrect outputs in multiple error conditions. This paper introduces a class of voters, called predictor voters, which can reso... Read More about Voting algorithms in multiple error scenarios for real-time control applications.

History-based weighted average voter: A novel software voting algorithm for fault-tolerant computer systems (2001)
Presentation / Conference Contribution

Voting algorithms have been widely used in the realisation of fault-tolerant systems. We propose a new software voting algorithm which uses the history record of redundant modules to compute the final output. Two versions for the novel algorithm are... Read More about History-based weighted average voter: A novel software voting algorithm for fault-tolerant computer systems.

Process control systems integration using object oriented technology (2001)
Presentation / Conference Contribution

The development of a control software design environment, namely the Integrated Design Notation (IDN), is presented. IDN supports the design, development and implementation of decentralised distributed control systems. A cable extrusion process is ta... Read More about Process control systems integration using object oriented technology.

Component-oriented voter model for dependable control applications (2001)
Journal Article
Latif-Shabgahi, G., Bass, J., & Bennett, S. (2001). Component-oriented voter model for dependable control applications. Microprocessors and Microsystems, 25(3), 167-176. https://doi.org/10.1016/S0141-9331%2801%2900109-0

In many industrial applications arbitration between redundant subsystems using voting algorithms is popular. Many voting strategies, implemented in hardware or software, have been proposed of which majority and median voters have been widely used in... Read More about Component-oriented voter model for dependable control applications.

Mapping and scheduling for heterogeneous architectures (1999)
Journal Article
Ramos-Hernandez, D., Tokhi, M., & Bass, J. (1999). Mapping and scheduling for heterogeneous architectures. Microprocessors and Microsystems, 23(1), 7-23. https://doi.org/10.1016/S0141-9331%2899%2900009-5

Extensive and computationally complex signal processing and control applications are commonly constructed from small computational blocks where the load decomposition and balance may not be easily achieved. This requires the development of mapping an... Read More about Mapping and scheduling for heterogeneous architectures.

An open environment for the specification, design and code generation of control algorithms (1998)
Presentation / Conference Contribution

Proposals for an open, yet integrated, design environment to ease the design of complex process control systems are presented. A hierarchical approach to the allocation of computing resources is typically used in process control systems. The lower en... Read More about An open environment for the specification, design and code generation of control algorithms.

Simulation of a component-oriented voter library for dependable control applications (1998)
Presentation / Conference Contribution

Control systems are required to meet increasingly stringent reliability and safety constraints. In many industrial applications, arbitration between redundant subsystems using voting algorithms is popular. Many voting strategies implemented in hardwa... Read More about Simulation of a component-oriented voter library for dependable control applications.

Design tools for hybrid control systems (1997)
Book Chapter
Hajji, M., Bass, J., Browne, A., & Fleming, P. (1997). Design tools for hybrid control systems. . Springer. https://doi.org/10.1007/BFb0014717

Hybrid systems exhibit a variety of discrete and continuous behaviour. Extensions to the Development Framework, an environment for real-time control system design, are described here. These extensions allow the management of discrete events such as m... Read More about Design tools for hybrid control systems.

A proposed design environment for dependable embedded systems (1997)
Presentation / Conference Contribution

Proposals for an integrated design environment to ease the design of complex embedded systems are presented. Embedded systems are computer-based systems which must respond to external stimuli within time scales determined by the external environment.... Read More about A proposed design environment for dependable embedded systems.

Experimental comparison of voting algorithms in cases of disagreement (1997)
Presentation / Conference Contribution

Voting algorithms are used to mask erroneous results from redundant subsystems (variants) in fault tolerant systems. While voting algorithms are well known and widely used, the authors are not aware of any detailed investigation of voter behaviour in... Read More about Experimental comparison of voting algorithms in cases of disagreement.

Testing fault-tolerant systems using a unified error model (1997)
Presentation / Conference Contribution

This paper presents a method of designing test data based around a unified error model. The model allows error 'surfaces' to be defined for a given application, and used to define a test region(s) that give a measure of test coverage. The paper appli... Read More about Testing fault-tolerant systems using a unified error model.

Error model for computer control systems (1996)
Presentation / Conference Contribution

This paper presents an error model that is intended to allow the dependability of computer control systems, with fault tolerant mechanisms included, to be evaluated. The model allows error `surfaces' to be defined for a given application, and used to... Read More about Error model for computer control systems.

The development framework: Work in progress towards a real-time control system design environment (1996)
Presentation / Conference Contribution

This paper describes work in progress on two extensions to the environment of a Development Framework for the design of control system software; hybrid system design and design of dependable systems. The Development Framework automatically converts a... Read More about The development framework: Work in progress towards a real-time control system design environment.

Development framework approach to heterogeneous system design for control systems (1996)
Journal Article
Baxter, M., Bass, J., Browne, A., Hajji, M., Tokhi, M., Croll, P., & Fleming, P. (1996). Development framework approach to heterogeneous system design for control systems. Control Engineering Practice, 4(2), 229-238. https://doi.org/10.1016/0967-0661%2895%2900230-8

An integrated environment of software development tools, known as the Development Framework, which automates the design process for complex real-time embedded control systems, is introduced. The approach favoured here is to maximise the use of commer... Read More about Development framework approach to heterogeneous system design for control systems.

Dependable, intelligent voting for real-time control software (1995)
Journal Article
Croll, P., Sharkey, A., Bass, J., Sharkey, N., & Fleming, P. (1995). Dependable, intelligent voting for real-time control software. Engineering Applications of Artificial Intelligence, 8(6), 615-623. https://doi.org/10.1016/0952-1976%2895%2900044-5

An intelligent and dependable voting mechanism for use in real-time control applications is presented. Strategies proposed by current safety standards advocate N-version software to minimize the effects of undetected software design faults (bugs). Th... Read More about Dependable, intelligent voting for real-time control software.

Intelligent voting strategies for dependable real-time control systems (1995)
Presentation / Conference Contribution

An intelligent and dependable voting mechanism for use in real-time control applications is presented. Strategies proposed by current safety standards advocate N-version software to minimise the effects from undetected software design faults (bugs).... Read More about Intelligent voting strategies for dependable real-time control systems.

Dependability modelling in a prototype Development Framework (1995)
Presentation / Conference Contribution

The Development Framework provides a highly automatic translation from a specification to an implementation. The specification is in a popular, graphical control engineering notation typically representing a system with stringent reliability requirem... Read More about Dependability modelling in a prototype Development Framework.

Prototype framework of tools for the design of real-time distributed control software (1994)
Presentation / Conference Contribution

A prototype framework of software tools for the design of distributed real-time control system software is described here. The tools provide a highly transparent transformation from a specification to an implementation. The specification is in a fami... Read More about Prototype framework of tools for the design of real-time distributed control software.

Prototype framework of design tools for computer-aided control engineering (1994)
Presentation / Conference Contribution

This paper introduces a framework of tools which allow the design of distributed, potentially fault-tolerant, real-time control software. This framework takes a system specified in the control engineering domain and translates this application-orient... Read More about Prototype framework of design tools for computer-aided control engineering.