A Three-valued Approach to Strategic Abilities under Imperfect Information

Proceedings of the Seventeenth International Conference on Principles of Knowledge Representation and Reasoning ◽

10.24963/kr.2020/10 ◽

2020 ◽

Author(s):

Francesco Belardinelli ◽

Vadim Malvone

Keyword(s):

Temporal Logic ◽

Imperfect Information ◽

State Of The Art ◽

Linear Time ◽

The State ◽

Perfect Information ◽

Time Logic ◽

Refinement Procedure

A major challenge for logics for strategies is represented by their verification in contexts of imperfect information. In this contribution we advance the state of the art by approximating the verification of Alternating-time Temporal Logic (ATL) under imperfect information by using perfect information and a three-valued semantics. In particular, we develop novel automata-theoretic techniques for the linear-time logic LTL, then apply these to finding “failure” states, where the ATL specification to be model checked is undefined. Such failure states can then be fed into a refinement procedure, thus providing a sound, albeit incomplete, verification procedure.

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An Abstraction-Based Method for Verifying Strategic Properties in Multi-Agent Systems with Imperfect Information

Proceedings of the AAAI Conference on Artificial Intelligence ◽

10.1609/aaai.v33i01.33016030 ◽

2019 ◽

Vol 33 ◽

pp. 6030-6037

Author(s):

Francesco Belardinelli ◽

Alessio Lomuscio ◽

Vadim Malvone

Keyword(s):

Temporal Logic ◽

Imperfect Information ◽

Perfect Information ◽

Multi Agent Systems ◽

Perfect Recall ◽

Agent Systems ◽

Multi Agent ◽

Refinement Procedure

We investigate the verification of Multi-agent Systems against strategic properties expressed in Alternating-time Temporal Logic under the assumptions of imperfect information and perfect recall. To this end, we develop a three-valued semantics for concurrent game structures upon which we define an abstraction method. We prove that concurrent game structures with imperfect information admit perfect information abstractions that preserve three-valued satisfaction. Further, we present a refinement procedure to deal with cases where the value of a specification is undefined. We illustrate the overall procedure in a variant of the Train Gate Controller scenario under imperfect information and perfect recall.

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ARCH-COMP 2019 Category Report: Falsification

10.29007/68dk ◽

2019 ◽

Cited By ~ 3

Author(s):

Gidon Ernst ◽

Paolo Arcaini ◽

Alexandre Donzé ◽

Georgios Fainekos ◽

Logan Mathesen ◽

...

Keyword(s):

Temporal Logic ◽

State Of The Art ◽

Cyber Physical Systems ◽

The State ◽

Base Line ◽

Physical Systems ◽

The Future ◽

Friendly Competition ◽

Initial Base

This report presents the results from the 2019 friendly competition in the ARCH workshop for the falsification of temporal logic specifications over Cyber-Physical Systems. We describe the organization of the competition and how it differs from previous years. We give background on the participating teams and tools and discuss the selected benchmarks and results. The benchmarks are available on the ARCH website1, as well as in the competition’s gitlab repository2. The main outcome of the 2019 competition is a common benchmark repository, and an initial base-line for falsification, with results from multiple tools, which will facilitate comparisons and tracking of the state-of-the-art in falsification in the future.

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Integrity Constraints in an Active Database Environment

Database Integrity ◽

10.4018/978-1-930708-38-9.ch004 ◽

2002 ◽

pp. 113-143

Author(s):

Juan M. Ale ◽

Mauricio Minuto Espil

Keyword(s):

Temporal Logic ◽

State Of The Art ◽

The State ◽

Point Of View ◽

Integrity Constraints ◽

Static Case ◽

Active Database ◽

Active Rules ◽

Dynamic Constraints ◽

Standard Committee

This chapter surveys the interaction between active rules and integrity constraints. First, we analyze the static case following the SQL-1999 Standard Committee point of view which, up to date, represents the state of the art. Then, we consider the case of dynamic constraints for which we use a temporal logic formalism. Finally, we discuss the applicability, limitations and partial solutions found when attempting to ensure the satisfaction of dynamic constraints.

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Near-linear Time Approximation Schemes for Clustering in Doubling Metrics

Journal of the ACM ◽

10.1145/3477541 ◽

2021 ◽

Vol 68 (6) ◽

pp. 1-34

Author(s):

Vincent Cohen-Addad ◽

Andreas Emil Feldmann ◽

David Saulpic

Keyword(s):

Facility Location ◽

Metric Spaces ◽

State Of The Art ◽

Linear Time ◽

The State ◽

Approximation Schemes ◽

Time Approximation ◽

Prize Collecting ◽

Doubling Metrics ◽

Efficient Approximation

We consider the classic Facility Location, k -Median, and k -Means problems in metric spaces of doubling dimension d . We give nearly linear-time approximation schemes for each problem. The complexity of our algorithms is Õ(2 (1/ε) O(d2) n) , making a significant improvement over the state-of-the-art algorithms that run in time n (d/ε) O(d) . Moreover, we show how to extend the techniques used to get the first efficient approximation schemes for the problems of prize-collecting k -Median and k -Means and efficient bicriteria approximation schemes for k -Median with outliers, k -Means with outliers and k -Center.

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Review of pipeline span analysis

World Journal of Engineering ◽

10.1108/wje-09-2017-0296 ◽

2019 ◽

Vol 16 (1) ◽

pp. 166-190 ◽

Cited By ~ 1

Author(s):

Abdulhakim Adeoye Shittu ◽

Fuat Kara ◽

Ahmed Aliyu ◽

Obinna Unaeze

Keyword(s):

State Of The Art ◽

Linear Time ◽

Cross Flow ◽

Time Domain Analysis ◽

Empirical Models ◽

The State ◽

Analysis Tool ◽

Content Type ◽

Wave Effects ◽

Semi Empirical

PurposeThe purpose of this paper is to mainly review the state-of-the-art developments in the field of hydrodynamics of offshore pipelines, identifying the key tools for analysis of pipeline free spans, their applications, their qualifying characteristics and capabilities and limitations.Design/methodology/approachThese different analytical, numerical and semi-empirical tools available for predicting such hydrodynamic loads and their effects include VIVANA, PIPESIN, VIVSIM, SIMULATOR, FATFREE, amongst others. Inherent in these models are current effects, wave effects and/ or pipe–soil interactions.FindingsAmongst these models, the most attention was given to the new VIVANA model because this model take into account the vortex-induced effects with respect to free-spanning pipelines (which have dominant effect in the span analysis in deep water) better than other semi-empirical models (such as Shear 7). Recent improvements in VIVANA include its ability to have arbitrary variation in speed and direction of current, as well as the ability for calculation of pure IL and combined IL-CF response. Improvements in fatigue assessments at free spans, i.e. pipe–soil interaction have been achieved through the combined frequency domain and non-linear time domain analysis methodology adopted. Semi-empirical models are still the de facto currently used in the design of free-spanning pipelines. However, there is need for further research on free-span hydrodynamic coefficients and on how in-line and cross-flow vibrations interact. Again, there is still the challenge due to VIV complexity in fully understanding the fluid structure interaction problem, as there is no consolidated procedure for its analysis. It has been observed that there is large scatter between the different codes adopted in the prediction of fatigue damage, as there lacks full-scale test data devoted to determination/validation of the coefficients used in the semi-empirical models. A case study of the preliminary design of a typical 48 in. pipeline has been presented in this study to demonstrate the use of the free-span analysis tool, DNV RP F105. Excel spreadsheet has been applied in the execution of formulas.Originality/valueThis review paper is the first of its kind to study the state-of-the-art development in pipeline free-span analysis models and demonstrate the use of analysis tool, DNV for MAFSL calculation. Hence, information obtained from this paper would be invaluable in assisting designers both in the industry and academia.

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Practical Picture Processing

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100051700 ◽

1974 ◽

Vol 32 ◽

pp. 338-339

Author(s):

T. A. Welton

Keyword(s):

Radiation Damage ◽

Coherence Length ◽

Spatial Information ◽

State Of The Art ◽

Coherent Radiation ◽

The State ◽

Energy Spread ◽

Electron Micrograph ◽

Picture Processing ◽

Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

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