Automata and Formal Language (chapter 6) ppt

... (cont’d) Proof: • Draw the variable dependency graph for G 1 and find all variables that cannot be reached from S. • Remove those variables and the productions involving them. • Eliminate any terminal ... V 1 . • Reduce the length of the right sides of the productions: 1. Put all productions A → a and A → BC into P^. 2. Repeat until no more productions are added to P^: For each...

Ngày tải lên: 14/07/2014, 02:20

... (i + 1) (mod 2 56) i = (i + 1) (mod 2 56) j = (j + S[i]) (mod 2 56) j = (j + S[i]) (mod 2 56) swap(S[i], S[j]) swap(S[i], S[j]) t = (S[i] + S[j]) (mod 2 56) t = (S[i] + S[j]) (mod 2 56) C C i i = ... stream)  have a pseudo random have a pseudo random keystream keystream  combined (XOR) with plaintext bit by bit combined (XOR) with plaintext bit by bit  randomness of randomne...

Ngày tải lên: 06/03/2014, 16:20

... ngôn ngữ hình thức. Hồ Văn Quân • An introduction to formal languages and automata. Peter Linz • Introduction to automata theory, languages, and computation. John Hopcroft & Jeffrey Ullman Storage  A ... configuration Generated Language G = (V, T, S, P) L(G) = {w∈T* | S ⇒* w} • Example 1.8: Take into consideration the grammar given in Example 1.6: L(G) = {a n b n | n ≥ 0}...

Ngày tải lên: 13/05/2014, 10:21

... Ab A → aAb A → λ 3 Formal Languages & Automata A formal language:  Is an abstraction of the general characteristics of programming languages.  Consists of a set of symbols and some formation ... trên. 15 Languages  Language concatenation: L1L2 = {xy | x∈L1, y∈L2} L n = L L L (n times) L 0 = {λ} 13 Languages  Language: a subset L of Σ *  Word or Sentence: a string in L...

Ngày tải lên: 11/07/2014, 19:20

... and unaffected, had been listened to with much more pleasure, though not playing half so well; and Mary, at the end of a long concerto, was glad to purchase praise and gratitude by Scotch and ... knowledge and accomplishments, was always impatient for display. Mary had neither genius nor taste; and though vanity had given her application, it had given her likewise a pedantic...

Ngày tải lên: 21/01/2014, 18:20

... further reducethepersistenceandmobilityofpharmaceuticalsintheenvironment.Inasim - il armanner,municipalwastewatertreatmentplantsgeneratepharmaceutical-laden biosolidsandwastewaterefuents,whicharedisposedbylandapplicationandused tomeetirrigationdemandsinaridregions.Recentsurveysoforganiccontaminants in wastewater efuents and biosolids have ... positively chargedsurfacesofmetal-hydrousoxide...

Ngày tải lên: 18/06/2014, 16:20