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Hybrid-logical reasoning in false-belief tasks 14

Hybrid-logical reasoning in false-belief tasks

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14th Conference on Theoretical Aspects of Rationality and Knowledge, TARK 2013

作者： Braüner, Torben Programming Logic and Intelligent Systems Research Group Roskilde University P.O. Box 260 RoskildeDK-4000 Denmark

ISBN: (纸本)9780615747163

The main aim of the present paper is to use a proof system for hybrid modal logic to formalize what are called falsebelief tasks in cognitive psychology, thereby investigating the interplay between cognition and logical reasoning about belief. We consider two different versions of the Smarties task, involving respectively a shift of perspective to another person and to another time. Our formalizations disclose that despite this difference, the two versions of the Smarties task have exactly the same underlying logical structure. We also consider the Sally-Anne task, having a somewhat more complicated logical structure, presupposing a \principle of inertia" saying that a belief is preserved over time, unless there is belief to the contrary. Copyright 2013 by the authors.

关键词： Artificial intelligence

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Evolutionary algorithms that use runtime migration of detector processes to reduce latency in event-based systems

Evolutionary algorithms that use runtime migration of detect...

引用

2013 NASA/ESA Conference on Adaptive Hardware and systems, AHS 2013

作者： Löffler, Christoffer Mutschler, Christopher Philippsen, Michael Programming Systems Group CS Dept. University of Erlangen-Nuremberg Germany Sensor Fusion and Event Processing Group Locating and Comm. Systems Dept. Fraunhofer Institute for Integrated Circuits IIS Erlangen Germany

ISBN: (纸本)9781467363839

Event-based systems (EBS) are widely used to efficiently process massively parallel data streams. In distributed event processing the allocation of event detectors to machines is crucial for both the latency and efficiency, and a naive allocation may even cause a system failure. But since data streams, network traffic, and event loads cannot be predicted sufficiently well the optimal detector allocation cannot be found a-priori and must instead be determined at runtime. This paper describes how evolutionary algorithms (EA) can be used to minimize both network and processing latency by means of runtime migration of event detectors. The paper qualitatively evaluates the algorithms on synthetical data streams in a distributed event-based system. We show that some EAs work efficiently even with large numbers of event detectors and machines and that a hybrid of Cuckoo Search and Particle Swarm Optimization outperforms others. © 2013 IEEE.

关键词： Particle swarm optimization (PSO)

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CellCilk: Extending cilk for heterogeneous multicore platforms

CellCilk: Extending cilk for heterogeneous multicore platfor...

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24th International Workshop on Languages and Compilers for Parallel Computing, LCPC 2011

作者： Werth, Tobias Schreier, Silvia Philippsen, Michael Computer Science Department Programming Systems Group University of Erlangen-Nuremberg Germany Faculty of Mathematics and Computer Science Data Processing Technology University of Hagen Germany

ISBN: (纸本)9783642360350

The potential of heterogeneous multicores, like the Cell BE, can only be exploited if the host and the accelerator cores are used in parallel and if the specific features of the cores are considered. Parallel programming, especially when applied to irregular task-parallel problems, is challenging itself. However, heterogeneous multicores add to that complexity due to their memory hierarchy and specialized accelerators. As a solution for these issues we present CellCilk, a prototype implementation of Cilk for heterogeneous multicores with a host/accelerator design, using the Cell BE in particular. CellCilk introduces a new keyword (spu-spawn) for task creation on the accelerator cores. Task scheduling and load balancing are done by a novel dynamic cross-hierarchy work-stealing regime. Furthermore, the CellCilk runtime employs a garbage collection mechanism for distributed data structures that are created during scheduling. On benchmarks we achieve a good speedup and reasonable runtimes, even when compared to manually parallelized codes. © 2013 Springer-Verlag.

关键词： Parallel programming

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Reliable speculative processing of out-of-order event streams in generic publish/subscribe middlewares 13

Reliable speculative processing of out-of-order event stream...

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7th ACM International Conference on Distributed Event-Based systems, DEBS 2013

作者： Mutschler, Christopher Philippsen, Michael University of Erlangen-Nuremberg Department of Computer Science Programming Systems Group Erlangen Germany Fraunhofer Institute for Integrated Circuits IIS Locating and Communication Department Sensor Fusion and Event Processing Group Erlangen Germany

ISBN: (纸本)9781450317580

In surveillance, sports, finances, etc., distributed event-based systems are used to detect meaningful events with low latency in high data rate event streams. Both known approaches to deal with the predominant out-of-order event arrival at the distributed detectors have their shortcomings: buffering approaches introduce latencies for event ordering and stream revision approaches may result in system overloads due to unbounded retraction cascades. This paper presents a speculative processing technique for out-of-order event streams that enhances typical buffering approaches. In contrast to other stream revision approaches our novel technique encapsulates the event detector, uses the buffering technique to delay events but also speculatively processes a portion of it, and adapts the degree of speculation at runtime to fit the available system resources so that detection latency becomes minimal. Our technique outperforms known approaches on both synthetical data and real sensor data from a Realtime Locating System (RTLS) with several thousands of out-of-order sensor events per second. Speculative buffering exploits system resources and reduces latency by 40% on average. Copyright © 2013 ACM.

关键词： Middleware

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Double inspection for run-time loop parallelization

Double inspection for run-time loop parallelization

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24th International Workshop on Languages and Compilers for Parallel Computing, LCPC 2011

作者： Philippsen, Michael Tillmann, Nikolai Brinkers, Daniel Computer Science Dept. Programming Systems Group University of Erlangen-Nuremberg Erlangen Germany Microsoft Research One Microsoft Way Redmond WA United States

ISBN: (纸本)9783642360350

The Inspector/Executor is well-known for parallelizing loops with irregular access patterns that cannot be analyzed statically. The downsides of existing inspectors are that it is hard to amortize their high run-time overheads by actually executing the loop in parallel, that they can only be applied to loops with dependencies that do not change during their execution and that they are often specifically designed for array codes and are in general not applicable in object oriented just-in-time compilation. In this paper we present an inspector that inspects a loop twice to detect if it is fully parallelizable. It works for arbitrary memory access patterns, is conservative as it notices if changing data dependencies would cause errors in a potential parallel execution, and most importantly, as it is designed for current multicore architectures it is fast - despite of its double inspection effort: it pays off at its first use. On benchmarks we can amortize the inspection overhead and outperform the sequential version from 2 or 3 cores onward. © 2013 Springer-Verlag.

关键词： Inspection

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A declarative pipeline language for complex data analysis

A declarative pipeline language for complex data analysis

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22nd International Symposium on Logic-Based Program Synthesis and Transformation, LOPSTR 2012

作者： Christiansen, Henning Theil Have, Christian Torp Lassen, Ole Petit, Matthieu Research Group PLIS: Programming Logic and Intelligent Systems Department of Communication Business and Information Technologies Roskilde University P.O. Box 260 Roskilde 4000 Denmark

ISBN: (纸本)9783642381966

We introduce BANpipe - a logic-based scripting language designed to model complex compositions of time consuming analyses. Its declarative semantics is described together with alternative operational semantics facilitating goal directed execution, parallel execution, change propagation and type checking. A portable implementation is provided, which supports expressing complex pipelines that may integrate different Prolog systems and provide automatic management of files. © 2013 Springer-Verlag.

关键词： Pipelines

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Evolutionary Algorithms that use Runtime Migration of Detector Processes to Reduce Latency in Event-Based systems

Evolutionary Algorithms that use Runtime Migration of Detect...

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NASA/ESA Conference on Adaptive Hardware and systems

作者： Christoffer Loffler Christopher Mutschler Michael Philippsen Programming Systems Group CS Dept. University of Erlangen-Nuremberg

ISBN: (纸本)9781467363822

关键词： Heuristics Evolutionary Algorithms Particle Swarm Optimization Publish/Subscribe Distributed Computing

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Object Support for OpenMP-style programming of GPU Clusters in Java

Object Support for OpenMP-style Programming of GPU Clusters ...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Carolin Wolf Georg Dotzler Ronald Veldema Michael Philippsen Computer Science Department Programming Systems Group University of Erlangen-Nuremberg Erlangen Germany

ISBN: (纸本)9781467362399

For scientists, it is advantageous to use a high level of abstraction for programming their simulations, so that they can focus on the problem at hand instead of struggling with low-level details. However, current HPC clusters with multiple GPUs per node only offer explicit communication to and from the GPUs, require manual work to keep the data consistent, and often need explicit kernel programming. Moreover, known GPU programming frameworks are limited to a single GPU or a single machine and also rarely support objects. Our system removes the above restrictions. With a slight but necessary change in Java's semantics, we achieve automatic distribution and efficient use of objects and arrays of objects on multiple GPUs in a cluster. On benchmarks that distribute arrays of objects over five machines with 10 GPUs, we achieve speedups of up to 4.9 compared to one node.

关键词： Arrays Java Graphics processing units Kernel programming Vectors Middleware

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A Distributed Polling with Probabilistic Privacy

A Distributed Polling with Probabilistic Privacy

引用

Reliable Distributed systems

作者： Yahya Benkaouz Rachid Guerraoui Mohammed Erradi Florian Huc Networking and Distributed Systems Research Group Mohammed V-Souissi University Rabat Morocco Distributed Programming Laboratory EPFL Lausanne Switzerland

In this paper, we present PDP, a distributed polling protocol that enables a set of participants to gather their opinion on a common interest without revealing their point of view. PDP does not rely on any centralized authority or on heavyweight cryptography. PDP is an overlay-based protocol where a subset of participants may use a simple sharing scheme to express their votes. In a system of M participants arranged in groups of size N where at least 2k-1 participants are honest, PDP bounds the probability for a given participant to have its vote recovered with certainty by a coalition of B dishonest participants by π(B/N) (k+1) , where π is the proportion of participants splitting their votes, and k a privacy parameter. PDP bounds the impact of dishonest participants on the global outcome by 2(kα + BN), where represents the number of dishonest nodes using the sharing scheme.

关键词： Protocols Privacy Cryptography Complexity theory Probabilistic logic Reliability Collaboration

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Distributed Low-Latency Out-of-Order Event Processing for High Data Rate Sensor Streams

Distributed Low-Latency Out-of-Order Event Processing for Hi...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Christopher Mutschler Michael Philippsen Friedrich-Alexander-Universitat Erlangen-Nurnberg Erlangen Bayern DE Programming Systems Group CS Department University of Erlangen-Nuremberg Germany

ISBN: (纸本)9781467360661

Event-based systems (EBS) are used to detect and analyze meaningful events in surveillance, sports, finances and many other areas. With rising data and event rates and with correlations among these events, sequential event processing becomes infeasible and needs to be distributed. Existing approaches cannot deal with the ubiquity of out-of-order event arrival that is introduced by network delays when distributing EBS. Order-less event processing may result in a system failure. We present a low-latency approach based on K-slack that achieves ordered event processing on high data rate sensor and event streams without a-priori knowledge. Slack buffers are dynamically adjusted to fit the disorder in the streams without using local or global clocks. The middleware transparently reorders the event input streams so that events can still be aggregated and processed to a granularity that satisfies the demands of the application. On a Realtime Locating System (RTLS) our system performs accurate low-latency event detection under the predominance of out-of-order event arrival and with a close to linear performance scale-up when the system is distributed over several threads and machines.

关键词： Detectors Delays Out of order Middleware Clocks Runtime Synchronization

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