16,940 research outputs found
Stability analysis of event-triggered anytime control with multiple control laws
To deal with time-varying processor availability and lossy communication
channels in embedded and networked control systems, one can employ an
event-triggered sequence-based anytime control (E-SAC) algorithm. The main idea
of E-SAC is, when computing resources and measurements are available, to
compute a sequence of tentative control inputs and store them in a buffer for
potential future use. State-dependent Random-time Drift (SRD) approach is often
used to analyse and establish stability properties of such E-SAC algorithms.
However, using SRD, the analysis quickly becomes combinatoric and hence
difficult to extend to more sophisticated E-SAC. In this technical note, we
develop a general model and a new stability analysis for E-SAC based on Markov
jump systems. Using the new stability analysis, stochastic stability conditions
of existing E-SAC are also recovered. In addition, the proposed technique
systematically extends to a more sophisticated E-SAC scheme for which, until
now, no analytical expression had been obtained.Comment: Accepted for publication in IEEE Transactions on Automatic Contro
Materials processing with tightly focused femtosecond vortex laser beams
This letter is the first demonstration of material modification using tightly
focused femtosecond laser vortex beams. Double-charge femtosecond vortices were
synthesized with the polarization-singularity beam converter described in Ref
[1] and then focused using moderate and high numerical aperture optics (viz.,
NA = 0.45 and 0.9) to ablate fused silica and soda-lime glasses. By controlling
the pulse energy we consistently machine high-quality micron-size ring-shaped
structures with less than 100 nm uniform groove thickness.Comment: 8 pages, 3 figures, 10 references; submitted to Appl. Phys. Lett. on
May 31, 201
Anticommutative extension of the Adler map
We construct a noncommutative (Grassmann) extension of the well-known Adler Yang–Baxter map. It satisfies the Yang–Baxter equation, it is reversible and birational. Our extension preserves all the properties of the original map except the involutivity
Reply to Comment by D. Spemann et al [EPL 98 (2012) 57006, arXiv:1204.2992]
This article is a reply to the Comment by D. Spemann et al (arXiv:1204.2992)
in response to our paper 'Revealing common artifacts due to ferromagnetic
inclusions in highly oriented pyrolytic graphite' (EPL, 97 (2012) 47001).Comment: Reply to arXiv:1204.2992 Comment by D. Spemann et al re
arXiv:1201.6374 by Sepioni et a
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