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A use case model is a logical model.
Each actor on a use case diagram represents a role
A role is a set of related activities executed by one or more people in the organzation. A role is not a specific user, although in some organizations a single person may execute a function leading you to believe that the function is user specific. This is simply a case of a role that is only executed by a single person.
A use case essentially outlines a process, for example withdraw money is a use case that exists for an ATM. Withdraw money is execucted by the role customer. Withdraw money can be executed many times.
Both actors and use cases are abstract and therefore are not physical models.
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What is a logical use for global variables?
Storing global data.
What is the difference between use case model and use case diagram?
Use Case diagrams are behavior diagrams of UML used to describe a set of actions (Use Cases) that some system or systems (Subject) should or can perform in collaboration with one or more external users of the system (Actors).Each use case should provide some observable and valuable result to the actors or other stakeholders of the system.Use case diagrams are a means for specifying:(external) requirements on a system under design, required usages of a system - to capture what a system is supposed to do;the functionality offered by existing system -- what system can do for clients;requirements the specified system poses on its environment - by defining how environment should interact with the system so that it will be able to perform its services.
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The type of model you would use to represent your human heart would be a physical model.
Which technoloigies use token passing method and a physical star but logical ring topology?
Token Ring
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VLAN
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Physical chemistry is used a lot in this case
SONET uses which topology?
SONET use RING physical topology and TOKEN logical topology. As simple as that. Logical topology deals with the data transmission. Physical topology deals with how the network is connected physically , BUS, RING, STAR and the like.
What is the Logical drive and physical drive?
* Physical file (PF) contains the data and have only one record format. Logical file (LF) is a view of the physical file which does not contain any data may be based on one physical file or more then one physical file. Logical file can have more then one record format. Logical can be non join or join logical file. Performance becomes better if you use the logical file in the program.
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please use www.google.com i also help of google
