Pearson eText for Software Engineering -- Instant Access (Pearson+)
10th Edition
ISBN: 9780137503148
Author: Ian Sommerville
Publisher: PEARSON+
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Chapter 25, Problem 25.1E
Explanation of Solution
Problems:
The problem that could arise when a company does not develop effective configuration management policies and processes are as follows:
- It is not possible to create new versions of software systems effectively as they change. As well as it is not possible for the developers to keep track of the changes to the software.
- It is difficult to control the costs and effort involved in making changes to a system.
- There may be chances to forget the storage place of the software source code for a particular version. In some cases, wrong version of a system may be delivered to the customers.
- Configuration management is seen as a part of a more general quality management process which results in ineffective quality management process.
- If some one is leaving the company, then it is very difficult to protect investments in software, and to reproduce a build with the correct component or continue development.
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Create 6 users: Don, Liz, Shamir, Jose, Kate, and Sal.
Create 2 groups: marketing and research.
Add Shamir, Jose, and Kate to the marketing group.
Add Don, Liz, and Sal to the research group.
Create a shared directory for each group.
Create two files to put into each directory:
spreadsheetJanuary.txt
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Assign access permissions to the directories:
Groups should have Read+Write access
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“Everyone else” should not have any access
Submit for grade:
Screenshot of /etc/passwd contents showing your new users
Screenshot of /etc/group contents showing new groups with their members
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⚫ your circuit diagrams for your basic bricks, such as AND, OR, XOR gates and 1 bit multiplexers,
⚫ your circuit diagrams for your extended full adder, designed in Section 1 and
⚫ your circuit diagrams for your 8-bit arithmetical-logical unit, designed in Section 2.
1 An Extended Full Adder
In this Section, we are going to design an extended full adder circuit (EFA). That EFA takes 6 one bit inputs: aj, bj,
Cin, Tin, t₁ and to. Depending on the four possible combinations of values on t₁ and to, the EFA produces 3 one bit
outputs: sj, Cout and rout.
The EFA can be specified in principle by a truth table with 26 = 64 entries and 3 outputs. However, as the EFA
ignores certain inputs in certain cases, it is easier to work with the following overview specification, depending only
on t₁ and to in the first place:
t₁ to Description
00
Output Relationship
Ignored
Inputs
Addition Mode
2 Coutsjaj + bj + Cin, Tout= 0
Tin
0 1
Shift Left Mode
Sj = Cin,
Cout=bj, rout = 0
rin, aj
10
1 1
Shift Right…
Show the correct stereochemistry
when needed!!
mechanism:
mechanism:
Show the correct stereochemistry when needed!!
Br
NaOPh
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Chapter 25 Solutions
Pearson eText for Software Engineering -- Instant Access (Pearson+)
Ch. 25 - Prob. 25.1ECh. 25 - Prob. 25.2ECh. 25 - Imagine a situation where two developers are...Ch. 25 - Prob. 25.4ECh. 25 - Prob. 25.5ECh. 25 - With reference to system building, explain why you...Ch. 25 - Prob. 25.7ECh. 25 - Prob. 25.8ECh. 25 - Describe six essential features that should be...Ch. 25 - Describe five factors that engineers should take...
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