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3. A machine makes screws and nuts using a tap (for the nuts) and a die (for the screws). The tool (tap or die) has to be changed between screws and nuts. Let such a machine be specified by the following CSP process where the actions screw and nut represent the process of manufacturing a screw or a nut, respectively. The action check verifies that the right tool is being used for the next part and changes the tool if necessary (from tap to die or the other way around as appropriate). NUT SCREW = check →nut → NUT = MACHINE = screw check →SCREW NUT || SCREW (a) Draw the transition graph of the process MACHINE. (b) Obviously the tool needs to be checked (and changed) between making nuts and making screws. Is this requirement always observed by MACHINE? Explain why or why not as the case might be.

3. A machine makes screws and nuts using a tap (for the nuts) and a die (for the screws). The tool (tap or die) has to be changed between screws and nuts. Let such a machine be specified by the following CSP process where the actions screw and nut represent the process of manufacturing a screw or a nut, respectively. The action check verifies that the right tool is being used for the next part and changes the tool if necessary (from tap to die or the other way around as appropriate). NUT SCREW = check →nut → NUT = MACHINE = screw check →SCREW NUT || SCREW (a) Draw the transition graph of the process MACHINE. (b) Obviously the tool needs to be checked (and changed) between making nuts and making screws. Is this requirement always observed by MACHINE? Explain why or why not as the case might be.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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3. A machine makes screws and nuts using a tap (for the nuts) and a die (for the screws). The tool (tap or die) has to be changed between screws and nuts. Let such a machine be specified by the following CSP process where the actions screw and nut represent the process of manufacturing a screw or a nut, respectively. The action check verifies that the right tool is being used for the next part and changes the tool if necessary (from tap to die or the other way around as appropriate). NUT SCREW = check →nut → NUT = MACHINE = screw check →SCREW NUT || SCREW (a) Draw the transition graph of the process MACHINE. (b) Obviously the tool needs to be checked (and changed) between making nuts and making screws. Is this requirement always observed by MACHINE? Explain why or why not as the case might be.
Transcribed Image Text:3. A machine makes screws and nuts using a tap (for the nuts) and a die (for the screws). The tool (tap or die) has to be changed between screws and nuts. Let such a machine be specified by the following CSP process where the actions screw and nut represent the process of manufacturing a screw or a nut, respectively. The action check verifies that the right tool is being used for the next part and changes the tool if necessary (from tap to die or the other way around as appropriate). NUT SCREW = check →nut → NUT = MACHINE = screw check →SCREW NUT || SCREW (a) Draw the transition graph of the process MACHINE. (b) Obviously the tool needs to be checked (and changed) between making nuts and making screws. Is this requirement always observed by MACHINE? Explain why or why not as the case might be.
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