| Project/Area Number |
62550259
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
計算機工学
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
KASAI Takumi (1988) Associate Professor, The University of Electro-Communications, 電気通信学部, 助教授 (70027382)
富田 悦次 (1987) 電気通信大学, 電気通信学部, 教授 (40016598)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Haruhisa Assistant Professor, The University of Electro-Communications, 電気通信学部, 講師 (90135418)
町田 元 電気通信大学, 電気通信学部, 助教授 (40090534)
笠井 琢美 電気通信大学, 電気通信学部, 助教授 (70027382)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1987: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Pushdown Automata / 等価性判定アルゴリズム / オートマトン / 変換器 / 等価性判定 / アルゴリズム |
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| Research Abstract |
First a new algorithm for checking equivalence of simple deterministic pushdown automata is presented. While it is based upon the previously established direct branching algorithm, the key step of new skipping need not be applied repeatedly and it needs to have only one skipping-end in contrast to the previous one.
Secondly, we introduce the concept "probability" into pushdown automata (PDA). According to the properties of errors, PPDA's are classified into unrestricted PPDA's (2-sided erroe PPDA's), RPDA's (1-sided error PPDS's), and BPDA's (bounded erroe PPDA's). It is shown that the class of languages accepted by PPDA's or BPDA's is independent of cut-points. It is also shown that there is an infinite hierarchy of the classes of languages accepted by RPDA's with different cut-points.
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