Topics Chapter 9 Using Data Flow Diagrams Data flow diagram symbols Data flow diagram levels Creating data flow diagrams Physical and logical data flow diagrams Partitioning Event driven modeling Use case and data flow diagrams Systems Analysis and Design Kendall and Kendall Fifth Edition Kendall & Kendall Using Data Flow Diagrams Unexploded data flow diagrams are useful to identify information requirements Exploded data flow diagrams can be used for presentation‚ education
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Entity-Relationship (E/R) Model Dr P Sreenivasa Kumar Professor CS&E Dept I I T Madras Entity-Relationship (E/R) Model Widely used conceptual level data model • proposed by Peter P Chen in 1970s Data model to describe the database system at the requirements collection stage • high level description. • easy to understand for the enterprise managers. • rigorous enough to be used for system building. Concepts available in the model • entities and attributes of entities. • relationships between
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Frank and Alex in a tug-of-war • Draw the free body diagram on the back of your sheet or your notes for Frank winning (accelerating away) a tugof-war with Alex – Draw Frank and Alex as separate objects‚ with forces acting on each – How many forces are there on each? – Identify Newton’s 3rd law pairs – Identify Newton’s 2nd law relationships 1 Frank and Alex in a tug-of-war • Draw the free body diagram on the back of your sheet or your notes for Frank winning (accelerating away)
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TERNARY PHASE DIAGRAMS An Introduction Guna Selvaduray San Jose State University Credit for Phase Diagram Drawings: Richard Brindos Credit for scanning the phase diagrams: Brenden Croom G. Selvaduray - SJSU - Oct 2004 Utility of Ternary Phase Diagrams Glass compositions Refractories Aluminum alloys Stainless steels Solder metallurgy Several other applications G. Selvaduray - SJSU - Oct 2004 References on Ternary Phase Diagrams A. Prince‚ Alloy Phase Equilibria‚ Elsevier Publishing
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Peran Teknologi Informasi dan Komunikasi dalam Pertumbuhan Ekonomi ABSTRAK Makalah bertujuan untuk memberikan penjelasan mengenai peran Teknologi Informasi dan Komunikasi (TIK) dalam memberikan kontribusi terhadap pertumbuhan ekonomi. Makalah ini mengkaji beberapa hasil studi penelitian ataupun artikel untuk mengkonfirmasi terdapatnya hubungan positif antara TIK dan pertumbuhan ekonomi. Selanjutnya makalah ini diorganisasi menjadi bagian pendahuluan‚ pembahasan‚ dan diakhiri dengan bagian penutup
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1. What is an Entity Relationship Diagram? An entity relationship diagram is a graphical representation of an organisation’s data storage requirements. Entity relationship diagrams are abstractions of the real world which simplify the problem to be solved while retaining its essential features. Entity relationship diagrams are used to: identify the data that must be captured‚ stored and retrieved in order to support the business activities performed by an organisation; and identify the data required
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Billy Weaver needs a place to stay. So he finds a place to stay for the night. Billy Weaver goes into this stranger’s house and doesn’t even know here. Billy Weaver goes inside and sets down on the couch. The Landlady asked him if he wanted anything to drink. He said yes please ‚and she said what do you want. The Landlady said we have fruits‚ snacks and candy. He said thank you I would have a couple of snacks. The Landlady went to go get the snacks for Billy Weaver. The Landlady came back
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Flowcharts Guidelines for Drawing System Flowcharts PROBLEMS CASE ANALYSES The Berridge Company FreezeTime‚ Inc. The Dinteman Company Lois Hale and Associates PROCESS MAPS AND DATA FLOW DIAGRAMS Process Maps Guidelines for Drawing Process Maps Data Flow Diagrams Guidelines for Drawing Data Flow Diagrams REFERENCES AND RECOMMENDED READINGS ANSWERS TO TEST YOURSELF OTHER DOCUMENTATION TOOLS Program Flowcharts Decision Tables Software Tools for Graphical Documentation and SOX Compliance
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Food Web Diagram Snake (D) Hawk (D) Coyote (D) Insects (C) Scorpion (C) Lizard (C) Quail (C) Mouse (C) Cactus (P) Grass (P) When you are explaining an ecosystem you have producers‚ consumers‚ and decomposers. Producers are the plants and the tress in the ecosystem that provide the energy to the ecosystem. As for the desert the producers are cactus and grass. The consumers of the ecosystem are in three different kinds‚ they are herbivores‚ carnivores‚ and omnivores. Herbivores are the consumers
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6 Pg 305 2. What is a data flow diagram? Why do systems analysts use data flow diagrams? Answers: A picture of the movement of data between external entities and the processes and data stores within a system. Systems analysts use DFDs to help in the analysis phase by accomplishing the following three things: 1. Requirements Determination 2. Requirements Structuring 3. Alternative Generation and Selection 3. Explain the rules for drawing good data flow diagrams. Answers: Process: A. No process
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