The Experts below are selected from a list of 28974 Experts worldwide ranked by ideXlab platform
Alwen Tiu - One of the best experts on this subject based on the ideXlab platform.
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formalising Observer Theory for environment sensitive bisimulation
Theorem Proving in Higher Order Logics, 2009Co-Authors: Jeremy E Dawson, Alwen TiuAbstract:We consider a formalisation of a notion of Observer (or intruder) theories, commonly used in symbolic analysis of security protocols. An Observer Theory describes the knowledge and capabilities of an Observer, and can be given a formal account using deductive systems, such as those used in various "environment-sensitive" bisimulation for process calculi, e.g., the spi-calculus. Two notions are critical to the correctness of such formalisations and the effectiveness of symbolic techniques based on them: decidability of message deduction by the Observer and consistency of a given Observer Theory. We consider a formalisation, in Isabelle/HOL, of both notions based on an encoding of Observer theories as pairs of symbolic traces. This encoding has recently been used in a Theory of open bisimulation for the spi-calculus. We machine-checked some important properties, including decidability of Observer deduction and consistency, and some key steps which are crucial to the automation of open bisimulation checking for the spi-calculus, and highlight some novelty in our Isabelle/HOL formalisations of decidability proofs.
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TPHOLs - Formalising Observer Theory for Environment-Sensitive Bisimulation
Lecture Notes in Computer Science, 2009Co-Authors: Jeremy E Dawson, Alwen TiuAbstract:We consider a formalisation of a notion of Observer (or intruder) theories, commonly used in symbolic analysis of security protocols. An Observer Theory describes the knowledge and capabilities of an Observer, and can be given a formal account using deductive systems, such as those used in various "environment-sensitive" bisimulation for process calculi, e.g., the spi-calculus. Two notions are critical to the correctness of such formalisations and the effectiveness of symbolic techniques based on them: decidability of message deduction by the Observer and consistency of a given Observer Theory. We consider a formalisation, in Isabelle/HOL, of both notions based on an encoding of Observer theories as pairs of symbolic traces. This encoding has recently been used in a Theory of open bisimulation for the spi-calculus. We machine-checked some important properties, including decidability of Observer deduction and consistency, and some key steps which are crucial to the automation of open bisimulation checking for the spi-calculus, and highlight some novelty in our Isabelle/HOL formalisations of decidability proofs.
Ramakrishna Kakarala - One of the best experts on this subject based on the ideXlab platform.
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Modeling performance in Observer Theory
Journal of Mathematical Psychology, 1993Co-Authors: Bruce M. Bennett, Donald D. Hoffman, Ramakrishna KakaralaAbstract:Abstract We propose a general framework for the study of perceptual capacities, a framework that encompasses theories of perceptual competence and models of perceptual performance. A competence Theory of a perceptual capacity (such as stereo vision) describes that capacity in an idealized, information-processing sense, without regard for noise, limited resolution, or limited computational power. A performance model, by contrast, describes the effects of noise, limited resolution, and limited computational power on actual performance as measured in a laboratory. Our framework for studying both competence and performance extends the formal Theory of perception known as Observer Theory. Observer Theory provides a canonical form in which to state competence theories of perceptual capacities. This canonical form is called an Observer. In this paper we link theories of perceptual competence with models of perceptual performance by constructing an extension to the definition of Observer, an extension that we call a "performance extension." To illustrate how the performance extension can aid both the perceptual theorist and the experimental psychologist, we use the performance extension to analyze a psychophysical study of surface interpolation. Finally, we explore a connection between performance extensions and signal detection Theory by showing how a signal detection rule can be derived from the performance extension.
Jun Huang - One of the best experts on this subject based on the ideXlab platform.
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State Estimation for One-Sided Lipschitz System with Markovian Jump Parameters
Lecture Notes in Electrical Engineering, 2019Co-Authors: Zhenkun Zhu, Jun Huang, Ming YangAbstract:This paper deals with the state estimation for one-sided Lipschitz system with Markovian jump parameters. The stochastic Observer frame is constructed by Luenberger Observer Theory. In the following sections, the Observer is designed and sufficient conditions are given so that the error system is exponentially stable in mean square. Finally, one example is simulated to demonstrate the proposed methods are effective.
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h Observer design for singular one sided lur e differential inclusion system
Journal of The Franklin Institute-engineering and Applied Mathematics, 2017Co-Authors: Jun Huang, Wei Zhang, Minjie Shi, Liang ChenAbstract:This paper deals with the H∞ Observer design problem for singular Lur’e differential inclusion system with one-sided Lipschitz term. The Luenberger Observer Theory is used to construct the framework of H∞ Observer. First, the system without disturbance is considered and sufficient conditions are derived to guarantee that the error system is asymptotically stable. Then, the result is extended to the system subject to disturbance, the conditions for the existence of H∞ Observer are also given. Finally, two examples are simulated to show the effectiveness of the proposed Observers in this paper.
Liang Chen - One of the best experts on this subject based on the ideXlab platform.
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h Observer design for singular one sided lur e differential inclusion system
Journal of The Franklin Institute-engineering and Applied Mathematics, 2017Co-Authors: Jun Huang, Wei Zhang, Minjie Shi, Liang ChenAbstract:This paper deals with the H∞ Observer design problem for singular Lur’e differential inclusion system with one-sided Lipschitz term. The Luenberger Observer Theory is used to construct the framework of H∞ Observer. First, the system without disturbance is considered and sufficient conditions are derived to guarantee that the error system is asymptotically stable. Then, the result is extended to the system subject to disturbance, the conditions for the existence of H∞ Observer are also given. Finally, two examples are simulated to show the effectiveness of the proposed Observers in this paper.
Jeremy E Dawson - One of the best experts on this subject based on the ideXlab platform.
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formalising Observer Theory for environment sensitive bisimulation
Theorem Proving in Higher Order Logics, 2009Co-Authors: Jeremy E Dawson, Alwen TiuAbstract:We consider a formalisation of a notion of Observer (or intruder) theories, commonly used in symbolic analysis of security protocols. An Observer Theory describes the knowledge and capabilities of an Observer, and can be given a formal account using deductive systems, such as those used in various "environment-sensitive" bisimulation for process calculi, e.g., the spi-calculus. Two notions are critical to the correctness of such formalisations and the effectiveness of symbolic techniques based on them: decidability of message deduction by the Observer and consistency of a given Observer Theory. We consider a formalisation, in Isabelle/HOL, of both notions based on an encoding of Observer theories as pairs of symbolic traces. This encoding has recently been used in a Theory of open bisimulation for the spi-calculus. We machine-checked some important properties, including decidability of Observer deduction and consistency, and some key steps which are crucial to the automation of open bisimulation checking for the spi-calculus, and highlight some novelty in our Isabelle/HOL formalisations of decidability proofs.
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TPHOLs - Formalising Observer Theory for Environment-Sensitive Bisimulation
Lecture Notes in Computer Science, 2009Co-Authors: Jeremy E Dawson, Alwen TiuAbstract:We consider a formalisation of a notion of Observer (or intruder) theories, commonly used in symbolic analysis of security protocols. An Observer Theory describes the knowledge and capabilities of an Observer, and can be given a formal account using deductive systems, such as those used in various "environment-sensitive" bisimulation for process calculi, e.g., the spi-calculus. Two notions are critical to the correctness of such formalisations and the effectiveness of symbolic techniques based on them: decidability of message deduction by the Observer and consistency of a given Observer Theory. We consider a formalisation, in Isabelle/HOL, of both notions based on an encoding of Observer theories as pairs of symbolic traces. This encoding has recently been used in a Theory of open bisimulation for the spi-calculus. We machine-checked some important properties, including decidability of Observer deduction and consistency, and some key steps which are crucial to the automation of open bisimulation checking for the spi-calculus, and highlight some novelty in our Isabelle/HOL formalisations of decidability proofs.
