In this paper we present a theory for decentralized supervisory control of a general class of multiprocess discrete event systems referred to as interacting discrete event systems (IDES). An IDES is a discrete event s...
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In this paper we present a theory for decentralized supervisory control of a general class of multiprocess discrete event systems referred to as interacting discrete event systems (IDES). An IDES is a discrete event system that consists of a number of components working concurrently and possibly restricted by a well-defined interaction specification. We extend the notion of decentralized supervisory control to this class of systems by adding a supervisor for the interaction specification. Conditions that guarantee the optimality of the decentralized supervision of this class of systems are established and a complexity analysis of the proposed procedure is presented.
Ad-hoc recycling between requirements documents of product variants is a major source of requirements defects. We present an approach for systematic requirements recycling based on a combination of abstraction (in ter...
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Ad-hoc recycling between requirements documents of product variants is a major source of requirements defects. We present an approach for systematic requirements recycling based on a combination of abstraction (in terms of a template) and traceability (between requirements). The main features of our approach are the use of conceptual models to determine relationships necessary for correct recycling and the focus on minimizing link selling. This approach can also be used to develop abstraction and traceability guidelines tailored to other application domains and traceability goals, such as change or project management.
Component-based development promises to revolutionize the way in which software is developed and maintained. However, contemporary component technologies, such as COM+/.NET, EJB/J2EE and CORBA, only support components...
ISBN:
(纸本)0201737914
Component-based development promises to revolutionize the way in which software is developed and maintained. However, contemporary component technologies, such as COM+/.NET, EJB/J2EE and CORBA, only support components in the final, implementation-oriented stages of development, leaving the earlier stages of analysis and design to be organized in largely traditional, non-component oriented ways. This book describes the KobrA method, which supports a model-driven, UML-based representation of components, and a product line approach to their development and evolution. This enables the benefits of component-based development to be realized throughout the software life-cycle, and allows the reusability of components to be significantly enhanced.
Modern enterprises are irreversibly dependent on large-scale, adaptive, component-based information systems whose complexity frequently exceeds current engineering capabilities for intellectual control, resulting in p...
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Much of the software we use for everyday purposes incorporates elements developed and maintained by someone other than the developer. These elements include not only code and databases but also dynamic data feeds from...
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Much of the software we use for everyday purposes incorporates elements developed and maintained by someone other than the developer. These elements include not only code and databases but also dynamic data feeds from online data sources. Although everyday software is not mission critical, it must be dependable enough for practical use. This is limited by the dependability of the incorporated elements. It is particularly difficult to evaluate the dependability of dynamic data feeds, because they may be changed by their proprietors as they are used. Further, the specifications of these data feeds are often even sketchier than the specifications of software components. We demonstrate a method of inferring invariants about the normal behavior of dynamic data feeds. We use these invariants as proxies for specifications to perform on-going detection of anomalies in the data feed. We show the feasibility of our approach and demonstrate its usefulness for semantic anomaly detection: identifying occasions when a dynamic data feed is delivering unreasonable values, even though its behavior may be superficially acceptable (i.e., it is delivering parsable results in a timely fashion).
The JVT/H.26L video coding scheme conceptually consists of a video coding layer (VCL) responsible mainly for coding efficiency and a network abstraction layer (NAL) that supports video specific transport features for ...
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The JVT/H.26L video coding scheme conceptually consists of a video coding layer (VCL) responsible mainly for coding efficiency and a network abstraction layer (NAL) that supports video specific transport features for a variety of networks. This paper describes the H.26L/JVT NAL in general, including the parameter set concept and the transport over packet-based and bit-stream oriented networks. Encapsulation of coded video data to RTP/UDP/IP transport is discussed, and applications of H.26L in fixed and wireless IP-based transmission environments are presented.
TORRENT is an EU-Supported Framework 5 project that is showing how intelligent control and negotiation capabilities can be built into access networks so as to give the residential customer the ability to choose among ...
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TORRENT is an EU-Supported Framework 5 project that is showing how intelligent control and negotiation capabilities can be built into access networks so as to give the residential customer the ability to choose among a variety of service offerings, in order to achieve an optimal combination of service parameters. This access should be transparent to the type of the core network being addressed. The realisation of a prototype service for a resource management system based on intelligent agent technology is now underway.
The strengths of product line engineering have been described before. But how can an organization make the move from developing one-of products to product line engineering without major interruptions in the day-today ...
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Modern enterprises are irreversibly dependent on large-scale, adaptive, component-based information systems whose complexity frequently exceeds current engineering capabilities for intellectual control, resulting in p...
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ISBN:
(纸本)0769514359
Modern enterprises are irreversibly dependent on large-scale, adaptive, component-based information systems whose complexity frequently exceeds current engineering capabilities for intellectual control, resulting in persistent difficulties in system development, management, and evolution. We propose an innovative framework of engineering representation and reasoning methods for developing these complex systems: the flow-service-quality (FSQ) framework. In dynamic network information systems with constantly varying function and usage, workflows and their corresponding traces of system services act as stable foundations for functional and non functional (quality attribute) specification, design, and operational control. Our objective is to provide theoretical foundations, language representations, and rigorous yet practical unified engineering methods to represent and reason about system flows as essential artifacts of system specification, design, and operation.
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