The Entity Relationship Diagram (ERD) depicts a conceptual data model that incorporates some of the important scientific information about the real world. It adopts a natural view that the real world consists of entities and relations (Chen‚ 1976). One objective of the ERD is to create a simple‚ easy to understand and conveniently presented data model consisting of entities‚ attributes‚ relationships and cardinalities. The model serves as tool for database design‚ where the model can facilitate communication
Premium Entity-relationship model Unified Modeling Language
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
Premium Animal Plant Omnivore
Topology Diagram Topology Name Logical Characteristics Physical Characteristics Star Data passes through the hub to reach other devices on the network. Several devices having its own cable that connects to a central hub‚ or sometimes a switch‚ or even a Multi-station Access Unit (MAU). Data passes through the hub to reach other devices on the network. Ring Information is passed from one computer to another in either clock-wise direction or counter clock-wise direction and
Premium Network topology Computer
Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation. A free-body diagram is a special example of the vector diagrams that were discussed in an earlier unit. These diagrams will be used throughout our study of physics. The size of the arrow in a free-body diagram reflects the magnitude of the force. The direction of the arrow shows the direction that the force is acting. Each force arrow in the diagram is labeled
Premium Force Type system Classical mechanics
Priscilla Avila HCIS/245 3/6/2015 Wk. 5 WORKFLOW DIAGRAM Dorothy has been experiencing constant headaches and fatigue. She decides it is time to visit her doctor‚ and she contacts her doctor’s office and schedules an appointment for the following day. 1. Dorothy calls her doctor’s office and requests a next day appointment. 2. That night the medical office computer verifies her insurance eligibility as well as for all the next day’s appointments. 3. When Dorothy arrives at her
Premium Laboratory Patient Physician
T A B The Free Body Diagram The Concurrent System Free Body Diagrams • Essential step in solving Equilibrium problems •Complex Structural systems reduced into concise FORCE systems WHAT IS A FREE BODY DIAGRAM? A FBD is a simplified representation of a PARTICLE or RIGID BODY that is isolated from its surroundings and on which all applied forces and reactions are shown. All forces acting on a particle original body must be considered‚ and equally important any force not
Premium Force
as Phase Diagrams By _________________ _________________ Material Science Lab #11 Report Introduction The purpose of this lab is to obtain the cooling curves for tin‚ lead and various alloys of these two metals. A phase diagram will be generated from these cooling curves. When a material is heated by adding energy at a constant rate‚ the temperature of the material will increase linearly with time‚ provided a phase transformation does not occur. As temperature of the sample becomes
Premium Temperature Phase Thermodynamics
1/9/2013 Mass and Haul Diagram HAUL : product of earth excavated and the distance it was transported to form an embankment or to be disposed as waste. unit: meter – station (metric) = 1 m3 to be transported FREE HAUL DISTANCE (FHD) : fixed distance within which the hauling of material is not paid for but it is assumed to be included in the cost of excavation. OVERHAUL (OH) : product of volume in excess of the free haul mass and the length of overhaul in which payment is already required. LENGTH
Premium Volume Length
Online Auction System Use Case and Misuse Case Diagrams Mounika Challagundla‚ Graduate Student Dr. Natarajan Meghanathan‚ Associate Professor Department of Computer Science Jackson State University‚ Jackson‚ MS 39217‚ USA use case description • Registration: Anyone who want to participate in auction first they have to register to the system. • Login: The user will provide login details in order to access anything. • Post items: Once registered as a seller‚ the seller can start posting his
Premium User Use case Use case diagram
Exercise 1 [AON] Using the table below‚ draw the network diagram and answer the questions. When you have completed answering the questions‚ do a forward/backward pass. Activity Start C B P A U T R N End Predecessor Start Start Start C‚ B‚ P P A A U T‚ R‚ N Estimate in weeks 0 6 4 3 7 4 2 3 6 0 . How many paths are in the network‚ and what are they? 2. What is the critical path and its duration? 3. What is the float on activity U? 4. What is the impact to the project if activity
Premium Critical path method Answer