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1. How long was the Therac-25 in operation before the ?rst documented accident? How much longer did it take for the system to be declared unsafe?
2. What is a race condition in software? Why are race conditions dif?cult to debug?
3. The following reasons have been given for the failure of computerized systems:
I. A system designed for one purpose was used for another purpose.II. Software was reused without adequate testing.III. There was an error in storing or converting a data value.IV. A line of code became a single point of failure.V. The overall system was too complicated to analyze.VI. There was a software race condition.VII. There was another software error (not listed above).
For each of the systems listed below, select the principal reason or reasons why it failed to operate as speci?ed.
a. Patriot missileb. Ariane 5c. AT&T long-distance networkd. Mars Climate Orbitere. Mars Polar Landerf. Denver International Airport baggage systemg. Tokyo Stock Exchangeh. Direct recording electronic voting machinesi. Therac-25
Devise a way to compress the following list of last names using a lossless technique similar to that shown in Table 8.6 for repeated terms. Describe your method and show the compressed list.
You will write the development and testing portion of the software development plan. Identify the key phases of the project that will be subject to testing and the type of testing to be used during that phase
Suppose you have a procedure that can partition a set of positive integers into two equal weight subsets. How could you use this procedure to solve the subset-sum problem?
every product or service has a buying process even digital products and services. you will research and analyze the
Develop a design for a GUI interface to support the CCRD use case used in Part B. Use a standard set of graphical ‘widgets' such as those supported in .NET or Java Swing.
The scenario is that the Public Affairs Office at Highline University gets requests for speakers on particular topics. To be able to respond to such request, that office wishes to create a database.
Describe threats that specifically target confidentiality on a data system. Do not limit yourself to the textbook for answers, and use external resources to support your conclusions.
You have just been hired as an Information Security Engineer for a large, multi-international corporation.
consider a situation in which your team has just finished the design phase and is about to start coding. your key
Design the hardware and software driver that will implement a byte-wide data transfer from your processor to a peripheral device.
Prepare the UML diagram for the class and then implement the class. Write a client program that tests all methods in the class.
Explain your choices. Is the organization you work for (or one that you are familiar with) meeting these key considerations?
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