1,681,382 research outputs found
Polishness of some topologies related to word or tree automata
We prove that the B\"uchi topology and the automatic topology are Polish. We
also show that this cannot be fully extended to the case of a space of infinite
labelled binary trees; in particular the B\"uchi and the Muller topologies are
not Polish in this case.Comment: This paper is an extended version of a paper which appeared in the
proceedings of the 26th EACSL Annual Conference on Computer Science and
Logic, CSL 2017. The main addition with regard to the conference paper
consists in the study of the B\"uchi topology and of the Muller topology in
the case of a space of trees, which now forms Section
What has NMR taught us about stripes and inhomogeneity?
The purpose of this brief invited paper is to summarize what we have (not)
learned from NMR on stripes and inhomogeneity in La{2-x}Sr{x}CuO{4}. We explain
that the reality is far more complicated than generally accepted.Comment: Accepted for publication in the Proceedings of the LT-23 Conference
(invited
The Design and Development of Interactive Multimedia Conference Proceedings
Many conferences are now providing electronic proceedings. Often, these proceedings are little more than electronic collections of documents put together in a standard software package, such as SuperBook or Acrobat. This means that few of these proceedings incorporate the full range of materials that a conference generates. Furthermore, because these general interfaces are not designed for conference proceedings, they do not provide all the features a conference warrants.
The interactive multimedia proceedings for the DAGS\u2792 Institute on Parallel Computation used an interface designed specifically for presenting conference materials and provided both talks (audio, video, and slides) and papers (in hypertext form) along with an extensive set of features for navigating and using the proceedings. This interface provided the basis for further work on the design and creation of electronic proceedings. As we developed the electronic proceedings for DAGS\u2793 and DAGS\u2794 we surveyed users of the prior proceedings and reevaluated this interface. This evaluation suggested many alternatives and extensions to the interface and led us to redesign and reimplement the DAGS interactive proceedings interface.
In this paper, we summarize the materials and features that comprise conference proceedings, describe and evaluate the DAGS\u2792 interface and detail the changes and decisions made in developing the new interface used for DAGS\u2793 and DAGS\u2794
From Chirps to Random-FM Excitations in Pulse Compression Ultrasound Systems
Pulse compression is often practiced in ultrasound Non Destructive Testing
(NDT) systems using chirps. However, chirps are inadequate for setups where
multiple probes need to operate concurrently in Multiple Input Multiple Output
(MIMO) arrangements. Conversely, many coded excitation systems designed for
MIMO miss some chirp advantages (constant envelope excitation, easiness of
bandwidth control, etc.) and may not be easily implemented on hardware
originally conceived for chirp excitations. Here, we propose a system based on
random-FM excitations, capable of enabling MIMO with minimal changes with
respect to a chirp-based setup. Following recent results, we show that
random-FM excitations retain many advantages of chirps and provide the ability
to frequency-shape the excitations matching the transducers features.Comment: 4 pages, 4 figures. Post-print from conference proceedings. Note that
paper in conference proceedings at http://dx.doi.org/10.1109/ULTSYM.2012.0117
has some rendering issue
Scaled tree fractals do not strictly self-assemble
In this paper, we show that any scaled-up version of any discrete
self-similar {\it tree} fractal does not strictly self-assemble, at any
temperature, in Winfree's abstract Tile Assembly Model.Comment: 13 pages, 3 figures, Appeared in the Proceedings of UCNC-2014, pp
27-39; Unconventional Computation and Natural Computation - 13th
International Conference, UCNC 2014, London, ON, Canada, July 14-18, 2014,
Springer Lecture Notes in Computer Science ISBN 978-3-319-08122-
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