3,237 research outputs found
A Detailed Account of The Inconsistent Labelling Problem of Stutter-Preserving Partial-Order Reduction
No full textOne of the most popular state-space reduction techniques for model checking is partial-order reduction (POR). Of the many different POR implementations, stubborn sets are a very versatile variant and have thus seen many different applications over the past 32 years. One of the early stubborn sets works shows how the basic conditions for reduction can be augmented to preserve stutter-trace equivalence, making stubborn sets suitable for model checking of linear-time properties. In this paper, we identify a flaw in the reasoning and show with a counter-example that stutter-trace equivalence is not necessarily preserved. We propose a stronger reduction condition and provide extensive new correctness proofs to ensure the issue is resolved. Furthermore, we analyse in which formalisms the problem may occur. The impact on practical implementations is limited, since they all compute a correct approximation of the theory.peerReviewe
Post-Reformation Reformed sources and children
No full textThis article suggests that the topic “children” received considerable attention in the post-Reformation era – the period of CA 1565-1725. In particular, the author argues that the post-Reformation Reformed sources attest of a significant interest in the education and parenting of children. This interest not only continued, but intensified during the sixteenth-century Protestant Reformation when much thought was given to the subject matter. This article attempts to appraise the aim of post-Reformation Reformed sources on the topic “children.
A direct A.C. to A.C. regenerative frequency and voltage converter
No full textIncludes bibliographical references.The reliable variable speed operation of an a. c. machine over a wide speed range is a problem that has received attention for some time. In this thesis a system to permit such operation from a fixed frequency fixed voltage supply is proposed, under the name of the asynchronous modulation converter. This converter is of the cycloconverter family, but is force-commutated and is not synchronised with the supply frequency. The power switching element comprises a power transistor in a diode bridge, coupled to the control circuitry by opto-isolators. The output of the a-mod converter is produced by a "chopper" modulation process and this results in the harmonics present being at frequencies well removed from the fundamental. A feedback system to ensure smooth commutation of the output current from the power switches is described. This feedback system operates by sensing the rate of rise of the inductive voltage surge on the load when a switch is opened to operate a freewheel path switch
Infinite-data PBES Quotienting with the mCRL2 toolset
No full textThis folder contains the benchmarks that were performed as part of the publications Thomas Neele, Tim A. C. Willemse, Jan Friso Groote: Solving Parameterised Boolean Equation Systems with Infinite Data Through Quotienting. FACS 2018. LNCS 11222, pp. 216-236. and Thomas Neele, Tim A. C. Willemse, Jan Friso Groote: Finding Compact Proofs for Infinite-Data Parameterised Boolean Equation Systems. Science of Computer Programming (FACS 2018 special issue), vol. 188, 102389, 2020
Dataset with experiments for 'Partial-Order Reduction for Parity Games with an Application on Parameterised Boolean Equation Systems'
No full textThis archive contains the experiments that were performed as part of the publication Thomas Neele, Tim A. C. Willemse, Wieger Wesselink: Partial-Order Reduction for Parity Games with an Application on Parameterised Boolean Equation Systems. TACAS 2020 (accepted for publication)
Zane Grey with Orange A.C. baseball team
No full textThis photograph shows Ohio native Zane Grey with the Orange A.C. Baseball Team, ca. 1896-1904. Prior to becoming a well-known author of western novels, Zane Grey was also a dentist and a semi-professional baseball player, with teams including the Orange Athletic Club and the Newark (New Jersey) Colts
A major new standard work on post-reformation reformed studies
No full textThis study is an advancement
of previous scholarship that has assessed the Post-Reformation reformed sources as ‘dead orthodoxy’, ‘dry’,
‘ridged’, and theologically diverted from the sixteenth-century
Protestant Reformation. Muller attempts to show continuity and
discontinuity of intellectual scholastic thought, particularly on
the theological prolegomena, the doctrine of Scripture and
doctrine of God, from the Medieval time, through the Protestant
Reformation to the post-Reformation Reformed period
(approximately 1565-1725)
Experimental research on spatial distribution of overtopping
No full textThe overtopping empirical formulas calculate the discharge only at the top of the crest of a coastal protection structure. On the other hand, the tolerable overtopping discharges are defined at certain points behind the crest where the total overtopping is reduced. The scope of this thesis is to find an empirical formula to describe the distribution of overtopping at the space behind the crest. This thesis comes as a further investigation on the work conducted by v.Kester [2009] for regular waves. In this research, a physical model was developed on which irregular waves are tested. Because of the duration of the tests and the amount of collected water (significant lose of water during the test), a completely new measuring system was designed. Five influencing parameters (variables) are considered on this research: wave height, wave period/steepness, slope angle, crest freeboard and crest permeability. The entire overtopping process is analysed separately for the total overtopping discharge, the overtopping discharge directly behind the crest and the distribution of overtopping behind the structure. In the analysis of the data collected from the measurements, the impact of the varying parameters is investigated leading to useful conclusions and better understanding of the entire process. Additionally, the experimental findings are analysed and compared to the relative existing methods. Based on the TAW [2002] method which is proposed by the EurOtop Manual [2007], a prediction formula is developed. This formula is a generic version of TAW [2002] formula in which a new reduction factor ?c is introduced in order to describe the decay of the overtopping and thus predict the discharge at any certain distance behind the crest. Other relevant methods are also analysed (Juul Jensen [1984], Steenaard [2002], Besley [1999] and v.Kester [2009]) and conclusions for their applicability are drawn leading to suggested improvements or corrections. Apart from the distribution of overtopping, on this thesis the determination of crest freeboard (which is an ambiguous issue) is also investigated. Finally, suggestions of further research on this topic are discussed. The entire work has been perfomed in close cooperation with van Oord.Hydraulic EngineeringCivil Engineering and Geoscience
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