The Experts below are selected from a list of 1155 Experts worldwide ranked by ideXlab platform
Theo D'hondt - One of the best experts on this subject based on the ideXlab platform.
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A Hybrid Visual Dataflow Language for Coordination in Mobile Ad Hoc Networks
2010Co-Authors: Andoni Lombide Carreton, Theo D'hondtAbstract:Because of the dynamic nature of mobile ad hoc networks and the applications running on top of them, these applications have to be conceived as Event-driven architectures. Such architectures are hard to program because coordination between concurrent and distributed mobile components has to be expressed by means of Event handlers or callbacks. Applications consisting of Disjoint Event handlers that are independently triggered (possibly by their environment) exhibit a very implicit control flow that is hard to grasp. This paper presents a visual dataflow language tailored towards mobile applications to express the interaction between mobile components that operate on data streams. By using a visual dataflow language as a separate coordination language, the coarse grained control flow of a mobile application can be specified visually and separately from the fine grained control flow. In its turn, this allows a very explicit view on the control flow of the entire mobile application.
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COORDINATION - A hybrid visual dataflow language for coordination in mobile ad hoc networks
Lecture Notes in Computer Science, 2010Co-Authors: Andoni Lombide Carreton, Theo D'hondtAbstract:Because of the dynamic nature of mobile ad hoc networks and the applications running on top of them, these applications have to be conceived as Event-driven architectures. Such architectures are hard to program because coordination between concurrent and distributed mobile components has to be expressed by means of Event handlers or callbacks. Applications consisting of Disjoint Event handlers that are independently triggered (possibly by their environment) exhibit a very implicit control flow that is hard to grasp. This paper presents a visual dataflow language tailored towards mobile applications to express the interaction between mobile components that operate on data streams. By using a visual dataflow language as a separate coordination language, the coarse grained control flow of a mobile application can be specified visually and separately from the fine grained control flow. In its turn, this allows a very explicit view on the control flow of the entire mobile application.
Andoni Lombide Carreton - One of the best experts on this subject based on the ideXlab platform.
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COORDINATION - A hybrid visual dataflow language for coordination in mobile ad hoc networks
Lecture Notes in Computer Science, 2010Co-Authors: Andoni Lombide Carreton, Theo D'hondtAbstract:Because of the dynamic nature of mobile ad hoc networks and the applications running on top of them, these applications have to be conceived as Event-driven architectures. Such architectures are hard to program because coordination between concurrent and distributed mobile components has to be expressed by means of Event handlers or callbacks. Applications consisting of Disjoint Event handlers that are independently triggered (possibly by their environment) exhibit a very implicit control flow that is hard to grasp. This paper presents a visual dataflow language tailored towards mobile applications to express the interaction between mobile components that operate on data streams. By using a visual dataflow language as a separate coordination language, the coarse grained control flow of a mobile application can be specified visually and separately from the fine grained control flow. In its turn, this allows a very explicit view on the control flow of the entire mobile application.
Sebastian J. Szybka - One of the best experts on this subject based on the ideXlab platform.
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On smoothness of black saturns
Journal of High Energy Physics, 2010Co-Authors: Piotr T. Chruściel, Michał Eckstein, Sebastian J. SzybkaAbstract:We prove smoothness of the domain of outer communications (d.o.c.) of the Black Saturn solutions of Elvang and Figueras. We show that the metric on the d.o.c. extends smoothly across two Disjoint Event horizons with topology \( \mathbb{R} \times {S^3} \) and \( \mathbb{R} \times {S^1} \times {S^2} \). We establish stable causality of the d.o.c. when the Komar angular momentum of the spherical component of the horizon vanishes, and present numerical evidence for stable causality in general.
Hung T. Nguyen - One of the best experts on this subject based on the ideXlab platform.
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Probability updating using second order probabilities and conditional Event algebra
Information Sciences, 1999Co-Authors: I. R. Goodman, Hung T. NguyenAbstract:Abstract The second order probability technique is a procedure whereby an incompletely specified (finite-argument) probability function is modeled as a random vector over the associated natural simplex of all possible probability functions of a fixed common number of arguments. Often, the distribution of the random vector is assumed to be a uniform one, as in the case of Goodman’s treatment of the probabilistic syllogism (or penguin triangle) problem (1998). But, when compatibility with a non-uniform prior distribution is sought, the uniform random vector assumption must be replaced by a different one. In a related, but distinct direction, conditional Event algebra is a new mathematical tool which allows the direct incorporation of conditional relations expressed through conditional probabilities with other such conditional relations or unconditional Events [I.R. Goodman, H.T. Nguyen, Journal of Uncertainty, Fuzziness, and Knowledge-Based Systems 3 (3) (1995) 247–339; I.R. Goodman, R.P. Mahler, H.T. Nguyen, Mathematics of Data Fusion, Kluwer Academic Publishers, Dordrecht, Holland, 1997]. The “Judy Benjamin” (JB) problem, as originally posed by Van Fraasen [British Journal of Philosophy of Science 32 (1981) 375–379], has been recently addressed by Grove and Halpern (G&H) [Proceedings of the 13th Conference Uncertainty in AI,1997, pp. 208–214], and has elements in it conducive to analysis via both second order probability and conditional Event algebra: The problem involves the issue of how to update a particular Event of interest having a known prior probability – part of a known uniform prior probability function – upon a known conditional probability statement – when the latter is given through a probability function otherwise unknown and distinct from the prior probability function. In the problem as stated, the Event of interest is Disjoint from the antecedent Event in the conditional probability statement. G&H make use of a trust principle in order to be able to apply, in effect, the second order probability technique with an associated uniform distribution. G&H’s result differs sharply from that of Van Fraasen, who employs instead a minimal cross-entropy approach to the problem, in that G&H show no change in probability values between the prior and posterior assessments. This paper considers in a more general context the application of the second order probability technique, using the Dirichlet family generalization of the uniform distribution over a simplex, in updating an Event upon a conditional probability statement when no such Disjointness as in the JB problem holds and compatibility is sought with a non-uniform prior. When this is specialized to the Disjoint Event case, even with a non-uniform prior, the independence result of G&H extends to this context. The JB problem is also considered via a conditional Event algebra viewpoint – which avoids the trust principle – in conjunction with the second order probability technique and general agreement with that of G&H’s independence result is established for the case of Disjoint Event of interest from the antecedent (and consequence) of the conditional form. These relations are also extended to a more general setting.
Piotr T. Chruściel - One of the best experts on this subject based on the ideXlab platform.
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On smoothness of black saturns
Journal of High Energy Physics, 2010Co-Authors: Piotr T. Chruściel, Michał Eckstein, Sebastian J. SzybkaAbstract:We prove smoothness of the domain of outer communications (d.o.c.) of the Black Saturn solutions of Elvang and Figueras. We show that the metric on the d.o.c. extends smoothly across two Disjoint Event horizons with topology \( \mathbb{R} \times {S^3} \) and \( \mathbb{R} \times {S^1} \times {S^2} \). We establish stable causality of the d.o.c. when the Komar angular momentum of the spherical component of the horizon vanishes, and present numerical evidence for stable causality in general.