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Parallel Parsing
Holko, Maroš ; Regéciová, Dominika (referee) ; Meduna, Alexandr (advisor)
The goal of this bachelor thesis is to create and implement a parallel version of a Cocke-Younger-Kasami algorithm, which is used for syntactic analysis. This algorithm works with context-free grammars, so a big part of this work is dedicated to context-free grammars and their transformation to the Chomsky normal form. Output of this thesis is console application in C++ which use threads for parallel processing. There is also an extension for finding all rule successions for given input string designed and implemented. In the end there is a discussion about program's advantages and disadvantages.
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Sequential and Parallel Grammars: Properties and Applications
Klobučníková, Dominika ; Martiško, Jakub (referee) ; Meduna, Alexandr (advisor)
This thesis deals with the topic of sequential and parallel grammars. Both of these groups cover a large number of grammar families, most of which, however, are not widely used because of the difficulties related to their processing. The thesis examines some of these grammar types, such as scattered-context grammars, multigenerative systems, and interactive L-systems, with focus on their normal forms. Subsequently, it introduces a set of algorithms utilising properties of the discussed grammar types as well as their normal forms. These algorithms are based on the Cocke-Younger-Kasami algorithm for context-free grammars, and are capable of parsing any grammar in the corresponding normal form. Finally, a program implementing the proposed algorithms is presented.
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General Grammars: Normal Forms with Applications
Klobučníková, Dominika ; Krčmář, Radim (referee) ; Meduna, Alexandr (advisor)
This thesis deals with the topic of unrestricted grammars, normal forms, and their applications. It focuses on context-sensitive grammars as their special cases. Based on the analysis of the set, an algorithm was designed using the principles of the Cocke-Younger-Kasami algorithm to make a decision of whether an input string is a sentence of a context-sensitivegrammar. The final application, which implements this algorithm, works with context-sensitive grammars in the Penttonen normal form.
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Parsing for ET0L Systems
Kožár, Tomáš ; Klobučníková, Dominika (referee) ; Meduna, Alexandr (advisor)
This thesis focuses on deciding the membership of strings in languages generated by ET0L systems. It is achieved by designing two algorithms. The first one is a modification of the existing algorithm Cocke-Younger-Kasami for syntax analysis of context-free grammars in Chomsky normal form. This modification takes into account different properties of ET0L systems compared to context-free grammars. Specifically, the parallel application of production rules and multiple tables of these production rules. Also, used normal form is different from Chomsky normal form since CNF is unfit for ET0L systems. The second designed algorithm works in a top-down manner and gradually generates all valid strings. The resulting algorithms are tested, demonstrated, and fully functional. The contributions of this thesis are two new algorithms for syntax analysis of ET0L systems.
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Final Sentential Forms and Their Applications
Kožár, Tomáš ; Kövári, Adam (referee) ; Meduna, Alexandr (advisor)
Bezkontextové gramatiky sú jedny z najpoužívanejších formálnych modelov v teórii formálnych jazykov. Majú mnoho užitočných použití, no pre mnoho aplikácii nemajú dostatočnú vyjadrovaciu silu. Preto zavádzame koncový jazyk F . Keď vetná forma bezkontextovej gramatiky G patrí do jazyka F , stáva sa konečnou vetnou formou. Odstránením neterminálov z konečných vetných foriem získavame jazyk gramatiky G ukončený jazykom F , L(G,F) . Dokazujeme, že pre každý rekurzívne vyčísliteľný jazyk existuje jazyk L(G,F) , kde F = { w#reversal(w) | w patrí do { 0,1 } * } a reversal(w) je obrátené slovo w . Keď ako F použijeme regulárny jazyk, nedosiahneme žiadne zvýšenie vyjadrovacej sily oproti bezkontextovým gramatikám. Ukazujeme viacero aplikácii koncových vetných foriem v oblastiach lingvistiky a bioinformatiky.
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Final Sentential Forms and Their Applications
Kožár, Tomáš ; Kövári, Adam (referee) ; Meduna, Alexandr (advisor)
Bezkontextové gramatiky sú jedny z najpoužívanejších formálnych modelov v teórii formálnych jazykov. Majú mnoho užitočných použití, no pre mnoho aplikácii nemajú dostatočnú vyjadrovaciu silu. Preto zavádzame koncový jazyk F . Keď vetná forma bezkontextovej gramatiky G patrí do jazyka F , stáva sa konečnou vetnou formou. Odstránením neterminálov z konečných vetných foriem získavame jazyk gramatiky G ukončený jazykom F , L(G,F) . Dokazujeme, že pre každý rekurzívne vyčísliteľný jazyk existuje jazyk L(G,F) , kde F = { w#reversal(w) | w patrí do { 0,1 } * } a reversal(w) je obrátené slovo w . Keď ako F použijeme regulárny jazyk, nedosiahneme žiadne zvýšenie vyjadrovacej sily oproti bezkontextovým gramatikám. Ukazujeme viacero aplikácii koncových vetných foriem v oblastiach lingvistiky a bioinformatiky.
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Parsing for ET0L Systems
Kožár, Tomáš ; Klobučníková, Dominika (referee) ; Meduna, Alexandr (advisor)
This thesis focuses on deciding the membership of strings in languages generated by ET0L systems. It is achieved by designing two algorithms. The first one is a modification of the existing algorithm Cocke-Younger-Kasami for syntax analysis of context-free grammars in Chomsky normal form. This modification takes into account different properties of ET0L systems compared to context-free grammars. Specifically, the parallel application of production rules and multiple tables of these production rules. Also, used normal form is different from Chomsky normal form since CNF is unfit for ET0L systems. The second designed algorithm works in a top-down manner and gradually generates all valid strings. The resulting algorithms are tested, demonstrated, and fully functional. The contributions of this thesis are two new algorithms for syntax analysis of ET0L systems.
|
|
|
Parallel Parsing
Holko, Maroš ; Regéciová, Dominika (referee) ; Meduna, Alexandr (advisor)
The goal of this bachelor thesis is to create and implement a parallel version of a Cocke-Younger-Kasami algorithm, which is used for syntactic analysis. This algorithm works with context-free grammars, so a big part of this work is dedicated to context-free grammars and their transformation to the Chomsky normal form. Output of this thesis is console application in C++ which use threads for parallel processing. There is also an extension for finding all rule successions for given input string designed and implemented. In the end there is a discussion about program's advantages and disadvantages.
|
|
|
Sequential and Parallel Grammars: Properties and Applications
Klobučníková, Dominika ; Martiško, Jakub (referee) ; Meduna, Alexandr (advisor)
This thesis deals with the topic of sequential and parallel grammars. Both of these groups cover a large number of grammar families, most of which, however, are not widely used because of the difficulties related to their processing. The thesis examines some of these grammar types, such as scattered-context grammars, multigenerative systems, and interactive L-systems, with focus on their normal forms. Subsequently, it introduces a set of algorithms utilising properties of the discussed grammar types as well as their normal forms. These algorithms are based on the Cocke-Younger-Kasami algorithm for context-free grammars, and are capable of parsing any grammar in the corresponding normal form. Finally, a program implementing the proposed algorithms is presented.
|
|
|
General Grammars: Normal Forms with Applications
Klobučníková, Dominika ; Krčmář, Radim (referee) ; Meduna, Alexandr (advisor)
This thesis deals with the topic of unrestricted grammars, normal forms, and their applications. It focuses on context-sensitive grammars as their special cases. Based on the analysis of the set, an algorithm was designed using the principles of the Cocke-Younger-Kasami algorithm to make a decision of whether an input string is a sentence of a context-sensitivegrammar. The final application, which implements this algorithm, works with context-sensitive grammars in the Penttonen normal form.
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