6,270 research outputs found
An ontological framework for web service processes
The process notion is central in computing. Business processes and workflow processes are essential elements of software systems implementations. Processes are connected to notions of interaction and composition. The Web Services Framework as a development and deployment platform for services is based on the assembly of interacting processes as the compositional paradigm. Service-based software development on and for the Web platform embracing the philosophy of discovering and using third-party services makes a shared knowledge representation framework necessary. We develop a semantical and ontological framework for service process composition. We propose a framework for the compositional de�nition of Web services based on the �-calculus to de�ne protocol-like restrictions on service interactions and based on description logic and ontologies to guide the discovery and modelling of services and processes
Possibilistic Information Flow Control for Workflow Management Systems
In workflows and business processes, there are often security requirements on
both the data, i.e. confidentiality and integrity, and the process, e.g.
separation of duty. Graphical notations exist for specifying both workflows and
associated security requirements. We present an approach for formally verifying
that a workflow satisfies such security requirements. For this purpose, we
define the semantics of a workflow as a state-event system and formalise
security properties in a trace-based way, i.e. on an abstract level without
depending on details of enforcement mechanisms such as Role-Based Access
Control (RBAC). This formal model then allows us to build upon well-known
verification techniques for information flow control. We describe how a
compositional verification methodology for possibilistic information flow can
be adapted to verify that a specification of a distributed workflow management
system satisfies security requirements on both data and processes.Comment: In Proceedings GraMSec 2014, arXiv:1404.163
Reconciling a component and process view
In many cases we need to represent on the same abstraction level not only
system components but also processes within the system, and if for both
representation different frameworks are used, the system model becomes hard to
read and to understand. We suggest a solution how to cover this gap and to
reconcile component and process views on system representation: a formal
framework that gives the advantage of solving design problems for large-scale
component systems.Comment: Preprint, 7th International Workshop on Modeling in Software
Engineering (MiSE) at ICSE 201
Semantic model-driven development of service-centric software architectures
Service-oriented architecture (SOA) is a recent architectural paradigm that has received much attention. The prevalent focus on platforms such as Web services, however, needs to be complemented by appropriate software engineering methods. We propose the model-driven development of service-centric software systems. We present in particular an investigation into the role of enriched semantic modelling for a modeldriven development framework for service-centric software systems. Ontologies as the foundations of semantic modelling and its enhancement
through architectural pattern modelling are at the core of the proposed approach. We introduce foundations and discuss the benefits and also the challenges in this context
Quality-aware model-driven service engineering
Service engineering and service-oriented architecture as an integration and platform technology is a recent approach to software systems integration. Quality aspects
ranging from interoperability to maintainability to performance are of central importance for the integration of heterogeneous, distributed service-based systems. Architecture models can substantially influence quality attributes of the implemented software systems. Besides the benefits of explicit architectures on maintainability and reuse, architectural constraints such as styles, reference architectures and architectural patterns can influence observable software properties such as performance. Empirical performance evaluation is a process of measuring and evaluating the performance of implemented software. We present an approach for addressing the quality of services and service-based systems at the model-level in the context of model-driven service engineering. The focus on architecture-level models is a consequence of the black-box
character of services
Distribution pattern-driven development of service architectures
Distributed systems are being constructed by composing a number of discrete components. This practice is particularly prevalent within the Web service domain in the form of service process orchestration and choreography. Often, enterprise systems are built from many existing discrete applications such as legacy applications exposed using Web service interfaces. There are a number of architectural configurations or distribution patterns, which express how a composed system is to be deployed in a distributed environment. However, the amount of code
required to realise these distribution patterns is considerable. In this paper, we propose a distribution
pattern-driven approach to service composition and architecting. We develop, based on a catalog of patterns, a UML-compliant framework, which takes existing Web service interfaces as its input and generates executable Web service compositions based on a distribution pattern chosen by the software architect
Dynamic Matrix-Fracture Transfer Behaviour in Dual-Porosity Models
Imperial Users onl
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