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Documents authored by Sakai, Masahiko

Document
Complete Volume
DOI: 10.4230/OASIcs.WPTE.2014
OASIcs, Volume 40, WPTE'14, Complete Volume

Authors: Manfred Schmidt-Schauß, Masahiko Sakai, David Sabel, and Yuki Chiba

Published in: OASIcs, Volume 40, First International Workshop on Rewriting Techniques for Program Transformations and Evaluation (2014)

Abstract
OASIcs, Volume 40, WPTE'14, Complete Volume
Cite as

First International Workshop on Rewriting Techniques for Program Transformations and Evaluation. Open Access Series in Informatics (OASIcs), Volume 40, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2014)

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@Proceedings{schmidtschau_et_al:OASIcs.WPTE.2014,
  title =	{{OASIcs, Volume 40, WPTE'14, Complete Volume}},
  booktitle =	{First International Workshop on Rewriting Techniques for Program Transformations and Evaluation},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-70-5},
  ISSN =	{2190-6807},
  year =	{2014},
  volume =	{40},
  editor =	{Schmidt-Schau{\ss}, Manfred and Sakai, Masahiko and Sabel, David and Chiba, Yuki},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/OASIcs.WPTE.2014},
  URN =		{urn:nbn:de:0030-drops-46216},
  doi =		{10.4230/OASIcs.WPTE.2014},
  annote =	{Keywords: Conference proceedings, Formal Definitions and Theory, Translator writing systems and compiler generators, Specifying and Verifying and Reasoning about Programs, Semantics of Programming Languages, Mathematical Logic, Grammars and Other Rewriting Systems}
}
Document
Front Matter
DOI: 10.4230/OASIcs.WPTE.2014.i
Frontmatter, Table of Contents, Preface, Workshop Organization

Authors: Manfred Schmidt-Schauß, Masahiko Sakai, David Sabel, and Yuki Chiba

Published in: OASIcs, Volume 40, First International Workshop on Rewriting Techniques for Program Transformations and Evaluation (2014)

Abstract
Frontmatter, Table of Contents, Preface, Workshop Organization
Cite as

First International Workshop on Rewriting Techniques for Program Transformations and Evaluation. Open Access Series in Informatics (OASIcs), Volume 40, pp. i-xv, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2014)

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@InProceedings{schmidtschau_et_al:OASIcs.WPTE.2014.i,
  author =	{Schmidt-Schau{\ss}, Manfred and Sakai, Masahiko and Sabel, David and Chiba, Yuki},
  title =	{{Frontmatter, Table of Contents, Preface, Workshop Organization}},
  booktitle =	{First International Workshop on Rewriting Techniques for Program Transformations and Evaluation},
  pages =	{i--xv},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-70-5},
  ISSN =	{2190-6807},
  year =	{2014},
  volume =	{40},
  editor =	{Schmidt-Schau{\ss}, Manfred and Sakai, Masahiko and Sabel, David and Chiba, Yuki},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/OASIcs.WPTE.2014.i},
  URN =		{urn:nbn:de:0030-drops-45814},
  doi =		{10.4230/OASIcs.WPTE.2014.i},
  annote =	{Keywords: Frontmatter, Table of Contents, Preface, Workshop Organization}
}
Document
DOI: 10.4230/OASIcs.WPTE.2014.27
Inverse Unfold Problem and Its Heuristic Solving

Authors: Masanori Nagashima, Tomofumi Kato, Masahiko Sakai, and Naoki Nishida

Published in: OASIcs, Volume 40, First International Workshop on Rewriting Techniques for Program Transformations and Evaluation (2014)

Abstract
Unfold/fold transformations have been widely studied in various programming paradigms and are used in program transformations, theorem proving, and so on. This paper, by using an example, show that restoring an one-step unfolding is not easy, i.e., a challenging task, since some rules used by unfolding may be lost. We formalize this problem by regarding one-step program transformation as a relation. Next we discuss some issues on a specific framework, called pure-constructor systems, which constitute a subclass of conditional term rewriting systems. We show that the inverse of T preserves rewrite relations if T preserves rewrite relations and the signature. We propose a heuristic procedure to solve the problem, and show its successful examples. We improve the procedure, and show examples for which the improvement takes effect.
Cite as

Masanori Nagashima, Tomofumi Kato, Masahiko Sakai, and Naoki Nishida. Inverse Unfold Problem and Its Heuristic Solving. In First International Workshop on Rewriting Techniques for Program Transformations and Evaluation. Open Access Series in Informatics (OASIcs), Volume 40, pp. 27-38, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2014)

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@InProceedings{nagashima_et_al:OASIcs.WPTE.2014.27,
  author =	{Nagashima, Masanori and Kato, Tomofumi and Sakai, Masahiko and Nishida, Naoki},
  title =	{{Inverse Unfold Problem and Its Heuristic Solving}},
  booktitle =	{First International Workshop on Rewriting Techniques for Program Transformations and Evaluation},
  pages =	{27--38},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-70-5},
  ISSN =	{2190-6807},
  year =	{2014},
  volume =	{40},
  editor =	{Schmidt-Schau{\ss}, Manfred and Sakai, Masahiko and Sabel, David and Chiba, Yuki},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/OASIcs.WPTE.2014.27},
  URN =		{urn:nbn:de:0030-drops-45848},
  doi =		{10.4230/OASIcs.WPTE.2014.27},
  annote =	{Keywords: program transformation, unfolding, conditional term rewriting system}
}
Document
DOI: 10.4230/LIPIcs.RTA.2011.267
Soundness of Unravelings for Deterministic Conditional Term Rewriting Systems via Ultra-Properties Related to Linearity

Authors: Naoki Nishida, Masahiko Sakai, and Toshiki Sakabe

Published in: LIPIcs, Volume 10, 22nd International Conference on Rewriting Techniques and Applications (RTA'11) (2011)

Abstract
Unravelings are transformations from a conditional term rewriting system (CTRS, for short) over an original signature into an unconditional term rewriting systems (TRS, for short) over an extended signature. They are not sound for every CTRS w.r.t. reduction, while they are complete w.r.t. reduction. Here, soundness w.r.t. reduction means that every reduction sequence of the corresponding unraveled TRS, of which the initial and end terms are over the original signature, can be simulated by the reduction of the original CTRS. In this paper, we show that an optimized variant of Ohlebusch's unraveling for deterministic CTRSs is sound w.r.t. reduction if the corresponding unraveled TRSs are left-linear or both right-linear and non-erasing. We also show that soundness of the variant implies that of Ohlebusch's unraveling.
Cite as

Naoki Nishida, Masahiko Sakai, and Toshiki Sakabe. Soundness of Unravelings for Deterministic Conditional Term Rewriting Systems via Ultra-Properties Related to Linearity. In 22nd International Conference on Rewriting Techniques and Applications (RTA'11). Leibniz International Proceedings in Informatics (LIPIcs), Volume 10, pp. 267-282, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2011)

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@InProceedings{nishida_et_al:LIPIcs.RTA.2011.267,
  author =	{Nishida, Naoki and Sakai, Masahiko and Sakabe, Toshiki},
  title =	{{Soundness of Unravelings for Deterministic Conditional Term Rewriting Systems via Ultra-Properties Related to Linearity}},
  booktitle =	{22nd International Conference on Rewriting Techniques and Applications (RTA'11)},
  pages =	{267--282},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-30-9},
  ISSN =	{1868-8969},
  year =	{2011},
  volume =	{10},
  editor =	{Schmidt-Schauss, Manfred},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.RTA.2011.267},
  URN =		{urn:nbn:de:0030-drops-31244},
  doi =		{10.4230/LIPIcs.RTA.2011.267},
  annote =	{Keywords: conditional term rewriting, program transformation}
}
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