Carbide (Fe–Fe3C) Phase Diagram • In their simplest form‚ steels are alloys of Iron (Fe) and Carbon (C). • The Fe-C phase diagram is a fairly complex one‚ but we will only consider the steel part of the diagram‚ up to around 7% C b d Carbon. • Phases present α-ferrite‚ γ-ferrite‚ δ-ferrite‚ Fe3C (iron carbide or cementite) Fe-C liquid solution School of Mechanical and Building Sciences‚ VIT University‚ Vellore 1 Phases in Fe–Fe3C Phase Diagram α-ferrite - solid solution
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CREATING A CONTEXT DIAGRAM 1 Creating a Context Diagram Harry R. Torres Dr. Matthew Anyanwu CIS510 Advance System Analysis and Design 28 July 2010 CREATING A CONTEXT DIAGRAM 2 Abstract Brian and Carrie are systems analysts with many years of systems development experience at a large firm. Jane has recently been hired as the company’s first-ever process manager. She has been reviewing the company’s
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programmers work to clarify the software requirements and build a model of the new computer program composed of these objects. It is important to create a good model for the new program that can be used to communicate the complexities of the new program to other members of the software development
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Draw ENTITY RELATIONSHIP DIAGRAM (ERD) for the following requirement: 1. Students take courses in a college 2. Customers have accounts in a bank 3. People own vehicles 4. Employees manage projects 5. Machines are made up of parts 6. A college offers several courses. Attributes of the course include course code‚ name and credits. Each course may have zero or more subjects 7. Hotel (HotelNo‚ Name‚ Add‚ TelNo) Room (RoomNo‚ HotelNo‚ Type‚ Price) Booking (HotelNo
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of work for the project. In this week’s assignment we will explore a construction company and the associated time estimates for each task as it relates to their entire project. In Table 1.0 you will find the results of our initial analysis which includes the optimistic (O)‚ most likely (M)‚ and pessimistic (P) estimation for duration times it will take to complete each task (A-J). Additionally‚ when taking the estimated numbers of O‚ M‚ and P and applying the equation “E = (O + 4M + P)/6 provided
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Review Entity-Relationship Diagrams and the Relational Model CS 186‚ Fall 2007‚ Lecture 2 R & G‚ Chaps. 2&3 A relationship‚ I think‚ is like a shark‚ you know? It has to constantly move forward or it dies. And I think what we got on our hands is a dead shark. Woody Allen (from Annie Hall‚ 1979) • Why use a DBMS? OS provides RAM and disk Review • Why use a DBMS? OS provides RAM and disk – Concurrency – Recovery – Abstraction‚ Data Independence – Query Languages – Efficiency (for most tasks)
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PART 1 MODULE 3 VENN DIAGRAMS AND SURVEY PROBLEMS EXAMPLE 1.3.1 A survey of 64 informed voters revealed the following information: 45 believe that Elvis is still alive 49 believe that they have been abducted by space aliens 42 believe both of these things 1. How many believe neither of these things? 2. How many believe Elvis is still alive but don’t believe that they have been abducted by space aliens? SOLUTION TO EXAMPLE 1.3.1 When we first read the data in this example‚ it may seem as if the numbers
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MIS 374 Rev 02 Process Modeling: Context Diagrams and Data Flow Diagrams (DFDs) Introduction Figuring out the business processes for complex systems can be complicated. For example‚ if the goal is to streamline an existing supply chain process‚ your investigation will cross multiple business units‚ perhaps starting with an on-line order‚ a retail store pick-up‚ or a telephone order. How does the current process work to replace items in inventory storage and on retail shelves? Computer systems
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3.9.2 Data Flow Diagram (DFD) DFD or Data Flow Diagram is a graphical representation that showing the flow of data of information system. It also shows the structured design of the program to replace the flowchart or pseudo code as program tool. Basically DFD can be divided into four components such as entity or external entity‚ process‚ data store and data flow. DFD start with an overview of the system that needs to be designed. This DFD known as context DFD that contain the entity and the process
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queries impossible to islands of information Makes Leads File System Critique (con’t.) Data Dependence Change in file’s data characteristics requires modification of data access programs Must tell program what to do and how Makes file systems cumbersome from programming and data management views Structural Change Dependence in file structure requires
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