DBLC ( DataBase Life Cycle): DBLC is a sequential process which is used to trace the history of the application that is present within the information system . The history of the application can be traced from the beginning till its last even though being outdated. DBLC is concurrent to Software Development Life Cycle (SDLC) because the database represents the core of the information system. It is composed of six phases: Initial study: Examining the operations of the current system. Design: It focuses on designing the database model which satisfies both operation and objectives of the company. Implementation and loading: It is a process of designing the specifications. Testing and evaluation: Ensure the database performance. Operation: The process that is designed to make it operational. Maintenance and evolution: Performs routine maintenance activity within the database.

Question

[5 marks] Give a recursive definition for the language anb2n where n = 1, 2, 3, ... over the alphabet Ó={a, b}. 2) [12 marks] Consider the following languages over the alphabet ={a ,b}, (i) The language of all words that begin and end an a (ii) The language where every a in a word is immediately followed by at least one b. (a) Express each as a Regular Expression (b) Draw an FA for each language (c) For Language (i), draw a TG using at most 3 states (d) For Language (ii), construct a CFG.

Answer 1

Question

Chapter 9, Problem 7P

Program Plan Intro

DBLC (DataBase Life Cycle):

DBLC is a sequential process which is used to trace the history of the application that is present within the information system.

The history of the application can be traced from the beginning till its last even though being outdated.

DBLC is concurrent to Software Development Life Cycle (SDLC) because the database represents the core of the information system.

It is composed of six phases:

Initial study:

Examining the operations of the current system.

Design:

It focuses on designing the database model which satisfies both operation and objectives of the company.

Implementation and loading:

It is a process of designing the specifications.

Testing and evaluation:

Ensure the database performance.

Operation:

The process that is designed to make it operational.

Maintenance and evolution:

Performs routine maintenance activity within the database.

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[5 marks] Give a recursive definition for the language anb2n where n = 1, 2, 3, ... over the alphabet Ó={a, b}. 2) [12 marks] Consider the following languages over the alphabet ={a ,b}, (i) The language of all words that begin and end an a (ii) The language where every a in a word is immediately followed by at least one b. (a) Express each as a Regular Expression (b) Draw an FA for each language (c) For Language (i), draw a TG using at most 3 states (d) For Language (ii), construct a CFG.

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