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Software Product Lines (SPLs) engineering aims to develop similar software systems by sharing a common set of software assets. Service-Oriented Computing (SOC) uses services as fundamental elements for developing applications. SOC provide dynamic capabilities that are needed in many product-lines. SPLs provide useful mechanisms for modeling dynamic applications implemented through service compositions...
Nowadays one can observe rapid development of various technologies supporting autonomic features and context-awareness of pervasive systems. And this is perfectly understandable as these features effectively increase the systems autonomicity. However, in the case of safety-critical realtime systems it becomes crucial to determine how the entire system performance is affected by the growth in complexity...
Context information is characterized by several qualities that make pervasive services challenging compared to conventional Web services. The additional complexities associated with pervasive services require solid software engineering practices. This paper presents a novel approach based on model-driven development for representing complex crosscutting context-dependent functionality in service interfaces...
This paper presents a novel hardware implementation of the adaptive JPEG-LS in field programmable gate array (FPGA), based on the low complexity lossless compression for images (LOCO-I) compression scheme. Differently from what previously reported in literature, this design achieves a much lower complexity and super high data throughput through an improved prediction model by breaking the feedback...
Reflexion models are a conformance checking technique between high-level models and source code. I propose three changes to improve scalability of the technique and its ease of use in the context of an evolving software development project. First, express architectural rules as design tests that may be checked in a testing framework. Second, support semi-automated changes to the mapping between source...
Requirements are sensitive to the context in which the system-to-be must operate. Where such context is well understood and is static or evolves slowly, existing RE techniques can be made to work well. Increasingly, however, development projects are being challenged to build systems to operate in contexts that are volatile over short periods in ways that are imperfectly understood. Such systems need...
Operator training systems are essential tools for industrial systems, particularly for those where human error impacts on the safety of materials and personnel may cause significant financial losses. This work is part of a research project concerned with the study of operator behaviour when facing safety-critical situations. This paper focuses on the simulator architecture of an operator training...
An agent-oriented pervasive system supporting a context-aware and personalized mLearning services provision within an InfoStation-based University network is presented. The InfoStation's middleware architecture facilitating the users' mobile (WiFi) access to services is described. The agents' interaction is explained in detail. An extended system architecture supporting the service personalization...
We observe two of the recent trends in information technology. Cloud Computing (CC) is widely accepted as an effective reuse paradigm. Mobile Computing with Mobile Internet Device (MID) such as iPhones and Android devices becomes a convenient alternative to personal computers by integrating mobility, communication, software functionality, and entertainment. Due to the resource limitations of MIDs,...
An agent-oriented middleware supporting contextaware and adaptable mLearning service provision within an InfoStation-based University network is presented. The InfoStation's middleware architecture facilitating the users' mobile (WiFi) access to services is described. The agents' interaction is explained in detail.
Ubiquitous computing environments are becoming more heterogeneous and highly dynamic. Systems need to dynamically self-adapt in order to accommodate dynamically changing resources, needs of different users and failure events. This paper focuses on the runtime adaptation mechanisms that need to be dealt with the distributed nature of systems and the heterogeneity of the environment. We tackle the problem...
We propose a formal framework for designing and developing adaptive N-variant programs. The framework supports multiple levels of fault detection, masking, and recovery through reconfiguration. Our approach is two-fold: we introduce an Adaptive Functional Capability Model (AFCM) to define levels of functional capabilities for each service provided by the system. The AFCM specifies how, once a fault...
Along with the growing software market in recent years, business requirements are changing more rapidly and the complexity of enterprise applications is growing continuously. An ideal goal is to encapsulate these requirements into a high-level abstraction, which can be used to drive large-scale adaptation of the underlying software implementation. Model Driven Engineering (MDE) is one of the enabling...
Nowadays virtual communities are spread all over the web, providing users a cyber-place to share a common purpose and interact with each other around the world. These environments face new challenges in order to provide their users with better tools to interact and fulfill the environment's goals. In this context we propose a model to create regulated interaction environments based on the theater...
Reconfiguration and self-management are important properties for systems that operate in hazardous and uncontrolled environments, such as inter-planetary space. These systems need a reconfiguration mechanism that provides recovery from individual component failures as well as the ability to dynamically adapt to evolving mission goals. One way to provide this functionality is to define a model of alternative...
A self adaptive communication protocol is proposed for peer to peer distributed computing. This protocol can configure itself automatically in function of application requirements and topology changes by choosing the most appropriate communication mode between peers. The protocol was designed in order to be used in conjunction with a decentralized environment for high performance distributed computing...
In the context of the EU funded R&D project ATRACO we are developing a conceptual framework and a system architecture that will support the realization of adaptive and trusted ambient intelligent systems. Our approach is based on a number of well established engineering principles, such as the distribution of control and the separation of service interfaces from the service implementation, adopting...
Over its lifetime, adaptive software may have to deal with the environment not anticipated during the original development. In such cases, we should introduce new adaptive code, for example, to detect the strange contexts or update the out-of-date adaptation decision logic. This paper proposes an engineering approach facilitates this kind of post-delivery modifications based on software architecture...
Context awareness is one of the most fundamental issues in pervasive computing. In this paper, an ontology based context model is proposed, which defines "high-level" context ontology to provide basic concepts for sharing and managing context information. Our context model takes QoS and Security supporting into account. In addition, a context aware architecture based on semantic web service...
In this paper, we present a model to dynamically compose adaptable context-dependent applications using context conditions. The contributions of this work are: designing components as compositions of behaviour; embedding decision points in the component at development time to determine component behaviour; supporting reconfiguration of decision policies at runtime to adapt behaviours. The approach...
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