207,241 research outputs found
The formal, tool supported development of real time systems
The language SDL has long been applied in the development of various kinds of systems. Real-time systems are one application area where SDL has been applied extensively. Whilst SDL allows for certain modelling aspects of real-time systems to be represented, the language and its associated tool support have certain drawbacks for modelling and reasoning about such systems. In this paper we highlight the limitations of SDL and its associated tool support in this domain and present language extensions and next generation real-time system tool support to help overcome them. The applicability of the extensions and tools is demonstrated through a case study based upon a multimedia binding object used to support a configuration of time dependent information producers and consumers realising the so called lip-synchronisation algorithm
Requirements modelling and formal analysis using graph operations
The increasing complexity of enterprise systems requires a more advanced
analysis of the representation of services expected than is currently possible.
Consequently, the specification stage, which could be facilitated by formal
verification, becomes very important to the system life-cycle. This paper presents
a formal modelling approach, which may be used in order to better represent
the reality of the system and to verify the awaited or existing system’s properties,
taking into account the environmental characteristics. For that, we firstly propose
a formalization process based upon properties specification, and secondly we
use Conceptual Graphs operations to develop reasoning mechanisms of verifying
requirements statements. The graphic visualization of these reasoning enables us
to correctly capture the system specifications by making it easier to determine if
desired properties hold. It is applied to the field of Enterprise modelling
A New Institutional Analysis of IFRS Adoption in Egypt: A Case Study of Loosely Coupled Rules and Routines
This paper examines the symbolic use of International Financial Reporting Standards (IFRS) in an Egyptian state-owned company (AQF Co.) that is partially privatised by drawing on new institutional sociology and its extensions. It explains how the ceremonial use of IFRS is shaped by the interplay between institutionalised accounting practices, conflicting institutions, power relations and the use of IT to institutionalizing accounting rules and routines. The research methodology is based on using an intensive case study. Data were collected from multiple sources, including unstructured and semi-structured interviews, direct and participative observations, discussions and documentary analysis. The findings revealed that the company faced conflicting institutional demands from outside. The Central Agency for Accountancy required the company to use the Uniform Accounting System (as a state-owned enterprise) and The Egyptian Capital Market Authority required the company to use IFRS (as a partially private sector company registered in the stock exchange). To meet these conflicting institutional demands, the company adopted loosely coupled accounting rules and routines and IT was used to institutionalizing existing Uniform Accounting System and preserving the status quo
Functional Requirements-Based Automated Testing for Avionics
We propose and demonstrate a method for the reduction of testing effort in
safety-critical software development using DO-178 guidance. We achieve this
through the application of Bounded Model Checking (BMC) to formal low-level
requirements, in order to generate tests automatically that are good enough to
replace existing labor-intensive test writing procedures while maintaining
independence from implementation artefacts. Given that existing manual
processes are often empirical and subjective, we begin by formally defining a
metric, which extends recognized best practice from code coverage analysis
strategies to generate tests that adequately cover the requirements. We then
formulate the automated test generation procedure and apply its prototype in
case studies with industrial partners. In review, the method developed here is
demonstrated to significantly reduce the human effort for the qualification of
software products under DO-178 guidance
A formal support to business and architectural design for service-oriented systems
Architectural Design Rewriting (ADR) is an approach for the design of software architectures developed within Sensoria by reconciling graph transformation and process calculi techniques. The key feature that makes ADR a suitable and expressive framework is the algebraic handling of structured graphs, which improves the support for specification, analysis and verification of service-oriented architectures and applications. We show how ADR is used as a formal ground for high-level modelling languages and approaches developed within Sensoria
- …