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Software evolution is a costly yet unavoidable consequence of a successful application. To accommodate the requirements of today's fast changing business world, it is required to adapt the new business rules without disturbing the existing working system. For the business rules evolutions where old and new business rules and business data entities have to exist concurrently in the system, we proposed...
Plugin-based application design has become increasingly popular in recent years, and has contributed to the success of a range of very different applications including Mozilla Firefox and the Eclipse development environment. Using plugins is a promising approach to build complex systems that have to be reconfigured at runtime, and several plugin based general purpose runtime environments are currently...
With the increased interest in multi-user systems with distributed decision making tasks, such as network centric warfare and free-flight air traffic control, the concept of shared situation awareness (SSA) has become more important. SSA relates to the awareness that different operators have of the system state and the information needs of their team-mates, in order to coordinate their actions effectively...
Current mobile middleware is designed according to a 'one-size-fits-all' paradigm, which lacks the flexibility for customization and adaptation to different situations, and does not support user-centered application scenarios well. In this paper we describe an ongoing intelligent mobile middleware research project called PLIMM that focuses on user-centered application scenarios. PLIMM is designed...
The sensor network service has emerged as a new technical research area. The sensor network service provides useful functions to the user by sensing the condition of physical entities. One important issue that is rarely addressed by current studies on the sensor network service is that they only use sensor-derived data to achieve local service goals. However, once external users can discover globally...
Fault tolerance in information security devices is difficult to establish due to the large number of possible interactions in the device (e. g. embedded code, boolean logic, electromagnetic interference, etc.) In previous work we examined information flow as a graph problem by composing orthogonal views of the device under analysis. In other work we used fault-tree analysis to reason about information...
As the semantic web is an open, complex and constantly evolving medium, it is the norm, but not exception that information at different sites is incomplete/inconsistent. This poses challenges for the engineering and development of agent systems on the semantic web since autonomous software agents need to understand, process and aggregate this information. Ontology language OWL provides core language...
Nowadays, the development of complex computing devices involves a substantial and growing part of software development. A great challenge for engineers is to manage the evolution of a system with several components in the face of mounting complexity due to concurrent hardware and software development. The key limitations of existing change management tools used for the design process of complex computing...
Traditional, standards-based approaches to certification are hugely expensive, of questionable credibility when development is outsourced, and a barrier to innovation. This paper is a call and a manifesto for new approaches to certification. We start by advocating a goal-based approach in which unconditional claims delivered by formal methods are combined with other evidence in multi-legged cases...
This paper presents supervisory control theory in a process-algebraic setting, and proposes a way of synthesising modular supervisors that guarantee nonblocking. The framework used includes the possibility of hiding actions which results in nondeterminism. As modularity crucially depends on the process equivalence used, the paper studies possible equivalences and points out that, in order to be consistent...
Semantic Web services, one of the most significant research areas within the semantic Web vision, has attracted increasing attention from both the research community and industry. The Web service modelling ontology (WSMO) has recently been proposed as an enabling framework for the total/partial automation of the tasks (e.g., discovery, selection, composition, mediation, execution, monitoring, etc...
Summary form only given. The Verified C project adds design by contract programming to C. The program verifier VCC accepts annotated C programs, generates logical verification conditions from them and passes them on to an automatic theorem prover to either prove the correctness of the program or find errors in it. VCC is build to verify the functional correctness of Microsoft's hypervisor code base...
Control systems must increasingly be designed to involve collections of hardware and software components, both of which may evolve over the lifetime of the system, and which are expected to provide self-managing, adaptive, autonomic behaviour. Understanding the behaviour such a system will exhibit under any specific conditions is a significant design challenge. We present a model derived from approaches...
We present results from the second pilot project in the international Verification Grand Challenge: a formally verified specification of a POSIX-compliant file store using the Z/Eves theorem prover. The project's overall objective is to build a verified file store for space-flight missions. Our specification of the file store is based on Morgan & Sufrin's specification of the UNIX filing system;...
Architecture models are built in parallel with applicative models, all along the development process. Since they equally refer to software and hardware components in which they are implemented, these models call for more heterogeneous design languages, with a larger granularity range too. At the level of design and verification languages, some standards have risen up, like UML, AADL, but none of them...
The development of embedded systems through models requires the creation of both a platform independent model (PIM) and a platform specific model (PSM). xUML is an extension to UML that adds precise execution semantics to models enabling a full description of platform independent models and the generation of code from them. However, to achieve different non-functional properties, a platform specific...
A current trend in the software engineering community is to integrate different tools in a friendly and powerful development environment for use by final users. This is also the case for tools based on formal methods, which are very valuable for increasing confidence in the reliability of software. This paper contributes to one promising approach to make this integration possible, the project FMICS-jETI...
Summary form only given. Pex takes test-driven development to the next level. Pex analyzes .NET applications. From a parameterized unit test, which serves as a specification, it automatically produces traditional unit tests cases with high code coverage. Moreover, when a generated test fails, Pex can often suggest a bug fix. To do so Pex performs a systematic program analysis (similar to path bounded...
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