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systems analysis and design

Questions and Answers of Systems Analysis And Design

Draw a use-case diagram for the dentist’s office system in exercise
Create an activity diagram and a set of detail use-case descriptions for the following dentist’s office system, but do not bother to identify the flow of events within each use case.Whenever new
Draw a use-case diagram for the process of buying glasses in exercise
Create an activity diagram and a set of detail use-case descriptions for the process of buying glasses from the viewpoint of the patient, but do not bother to identify the flow of events within each
Investigate the Object Management Group. Write a brief memo describing what it is, its purpose, and its influence on UML and the object approach to systems development. (Hint: A good resource is
Investigate the Web site for Rational Software (www.306.ibm.com/software/rational/) and its repository of information about UML.Write a paragraph news brief on the current state of UML (e.g., the
Develop a questionnaire that will help gather information regarding processes at a popular restaurant, or the college cafeteria (e.g., ordering, customer service). Give the questionnaire to ten to
Find a questionnaire on the Web that has been created to capture customer information. Describe the purpose of the survey, the way questions are worded, and how the questions have been organized. How
Find a partner and interview each other about what tasks each did in the last job you held (full-time, part-time, past, or current). If you haven’t worked before, then assume your job is being a
Suppose you are the analyst charged with developing a new system to help senior managers make better strategic decisions. What requirements-gathering techniques will you use? Describe in detail how
Suppose you are the analyst charged with developing a new system for the university bookstore so students can order books online and have them delivered to their dorms or off-campus housing.What
In 1997, Oxford Health Plans had a computer problem that caused the company to overestimate revenue and underestimate medical costs. Problems were caused by the migration of its claims processing
Pretend that your instructor has asked you and two friends to create a Web page to describe the course to potential students and provide current class information(e.g., syllabus, assignments,
Read Your Turn 3-1. Create a risk assessment that lists the potential risks associated with performing the project, along with ways to address the risks.
Suppose that you are in charge of the project that is described in exercise C and the project will be staffed by members of your class. Do your classmates have all the right skills to implement such
Create a workplan listing the tasks that will need to be completed to meet the project’s objectives. Create a Gantt chart and a PERT chart in a project management tool(e.g., Microsoft Project) or
Consider the system described in exercise
You have been told that recruiting season begins a month from today and that the new system must be used. How would you approach this situation? Describe what you can do as the project manager to
Refer to the situation in exercise
Pretend that the career services office at your university wants to develop a system that collects student résumés and makes them available to students and recruiters over the Web. Students should
Select a specific project management topic such as CASE, project management software, or timeboxing and search for information on that topic using the Web. The URL listed in exercise A or any search
Reread Your Turn 2-1. (Identify Tangible and Intangible Value). Create a list of the stakeholders that should be considered in a stakeholder analysis of this project.
Consider the Amazon.com Web site. The management of the company decided to extend their Web-based system to include products other than books (e.g., wine and specialty gifts). How would you have
Supposed that you are interested in buying a new computer. Create a cost-benefit analysis that illustrates the return on investment that you would receive from making this purchase. Computer-related
Car dealers have realized how profitable it can be to sell automobiles using the Web. Pretend you work for a local car dealership that is part of a large chain such as CarMax. Create a system request
Think about your ideal analyst position.Write a newspaper ad to hire someone for that position. What requirements would the job have? What skills and experience would be required? How would an
Look in the classified section of your local newspaper.What kinds of job opportunities are available for people who want analyst positions? Compare and contrast the skills that the ads ask for to the
Using the Web, find a set of CASE tools that support the UML. A couple of examples include Rational Rose and Visual Paradigm. Find at least two more. Write a short report describing how well they
Investigate the Object Management Group (OMG) on the Web. Write a report describing the purpose of the OMG and what it is involved with besides the UML. (Hint: A good Web site with which to begin is
Investigate the Unified Modeling Language on the Web.Write a paragraph news brief describing the current state of the UML. (Hint: A good Web site with which to begin is www.uml.org.)
Suppose you are an analyst developing a new executive information system intended to provide key strategic information from existing corporate databases to senior executives to help in their decision
Suppose you are an analyst working for a small company to develop an accounting system. What type of methodology would you use? Why?
Suppose you are an analyst developing a new information system to automate the sales transactions and manage inventory for each retail store in a large chain.The system would be installed at each
Suppose you are an analyst working for a small company to develop an accounting system.Would you use the Unified Process to develop the system, or would you prefer one of the traditional approaches?
Suppose you are a project manager who typically has been using a waterfall development–based methodology on a large and complex project. Your manager has just read the latest article in
Investigate IBM’s Rational Unified Process (RUP) on the Web. RUP is a commercial version that extends aspects of the Unified Process. Write a brief memo describing how it is related to the Unified
The basic types of methodologies discussed in this chapter can be combined and integrated to form new hybrid methodologies. Suppose you were to combine throwaway prototyping with the use of waterfall
Suppose you are a project manager using a waterfall development–based methodology on a large and complex project. Your manager has just read the latest article in Computerworld that advocates
A certain target has the following characteristics: its range away from the radar given in its corresponding x- y- and z- components is ????25Km???? 32Km???? 12Km????. The target velocity vector is
An L-band pulsed radar is designed to have an unambiguous range of and range resolution . The maximum resolvable Doppler frequency corresponds to. Compute the maximum required pulse width, the PRF,
A certain radar is tasked with detecting and tracking the moon. Assume that the average distance to the moon is 3.844 ???? 108m, and its average radar cross section is 6.64 ???? 1011m2. (a) Compute
(a) Develop an expression for the minimum PRF of a pulsed radar. (b) Compute for a closing target whose velocity is . (c) What is the unambiguous range? Assume that .dBm 10 P 1mW????------------????=
A pulsed radar system has a range resolution of . Assuming sinusoid pulses at, determine the pulse width and the corresponding bandwidth.
In reference to Fig. 1.18, compute the Doppler frequency for ,, and . Assume that .
Starting with a modified version of Eq. (1.25), derive an expression for the Doppler shift associated with a receding target.
A certain L-band radar has center frequency , and PRF . What is the maximum Doppler shift that can be measured by this radar?
Repeat the previous problem for an X-Band radar (9.5GHz).
Assume an S-band radar, what are the Doppler frequencies for the following target range rates: 50m/s; 200m/s; and 250m/s.
Compute the round-trip delays, minimum PRIs, and corresponding PRFs for targets located 30Km, 80Km, and 150Km away from the radar.
Compute the Doppler shift associated with a closing target with velocity 100, 200, and 350 meters per second. In each case, compute the time dilation factor. Assume that .
An X-band radar uses PRF of . Compute the unambiguous range and the required bandwidth so that the range resolution is . What is the duty cycle?
A certain pulsed radar uses pulse width . Compute the corresponding range resolution.
For the same radar in Problem 1.1, assume a duty cycle of 30% and peak power of. Compute the average power and the amount of radiated energy during the first .
(a) Calculate the maximum unambiguous range for a pulsed radar with PRF of and . (b) What are the corresponding PRIs?
10. State one feature of PNG that you could use to convince someone that PNG is a better algorithm than GIF.
9.a) The LZ77 compression algorithm falls into which class of data compression algorithms?b) Name an advantage of Huffman coding over LZ77.c) Name an advantage of LZ77 over Huffman coding.d) Which is
8. JPEG is a poor choice for compressing line drawings, such as the one shown in Figure 7A.4. Why do you think this is the case? What other compression methods would you suggest? Give justification
7. Complete the LZ77 data compression illustrated in Section 7A.3.
6. Create a Huffman tree and assign Huffman codes for the “Star Bright” rhyme used in Section 7A.3.Use for whitespace instead of underscores.
5. Compute the compression factors for each of the JPEG images in Figure 7A.4.
4. Use arithmetic coding to compress your name. Can you get it back after you have compressed it?
3.a) Name two types of statistical coding.b) Name an advantage and a disadvantage of statistical coding.
2. What is information entropy, and how does it relate to information redundancy?
1. Who was the founder of the science of information theory? During which decade did he do his work?
49. Our discussion of RAID is biased toward consideration of standard rotating magnetic disks. Is RAID necessary for SSD storage? If not, does this make SSD storage slightly more affordable for the
48.a) Which of the RAID systems described in this chapter cannot tolerate a single disk failure?b) Which can tolerate more than one simultaneous disk failure?
47. A particular high-performance computer system has been functioning as an e-business server on the Web. This system supports $10,000 per hour in gross business volume. It has been estimated that
46. Suppose you have a 100GB database housed on a disk array that supports a transfer rate of 60MBps and a tape drive that supports 200GB cartridges with a transfer rate of 80MBps. How long will it
45. Discuss the pros and cons of using disk versus tape for backups.
44. You have a need to archive a large amount of data. You are trying to decide whether to use tape or optical storage methods. What are the characteristics of this data and how it is used that will
43. How would the error-correction requirements of an optical document storage system differ from the error-correction requirements of the same information stored in textual form? What are the
42. Discuss the difference between how DLT and DAT record data. Why would you say that one is better than the other?
41. A company that has engaged in a business that requires fast response times has just received a bid for a new system that includes much more storage than was specified in the requirements
40. The disk drives connected to the servers in your company’s server farm are nearing the end of their useful lives. Management is considering replacing 8TB of disk capacity with SSDs. Someone is
39. If 800GB server-grade HDDs cost $300, electricity costs $0.10 per kilowatt hour, and facilities cost $0.01 per GB per month, use the disk specification in Figure 7.15 to determine how much it
38. Compare the disk specifications for the HDD and SSD in Figures 7.15 and 7.17, respectively.Which items are the same? Why? Which items are different? Why?
37. Explain wear leveling and why it is needed for SSDs. We said that wear-leveling is important for the continual updating of virtual memory pagefiles. What problem does wear-leveling aggravate for
36. In Section 7.6.2, we said that magnetic disks are power hungry as compared to main memory. Why do you think this is the case?
35. How does the organization of an SSD differ from a magnetic disk? How are they similar to a disk?
34. How does the organization of an optical disk differ from the organization of a magnetic disk?
33. What are the advantages and disadvantages of having a small number of sectors per disk cluster?(Hint: You may want to think about retrieval time and the required lifetime of the archives.)
32. Transfer rate of a disk drive can be no faster than the bit density (bits/track) times the rotational speed of the disk. Figure 7.15 gives a data transfer rate of 112GB/sec. Assume that the
31. Suppose a disk drive has the following characteristics:• 6 surfaces• 953 tracks per surface• 256 sectors per track• 512 bytes/sector• Track-to-track seek time of 6.5ms• Rotational
30. Suppose a disk drive has the following characteristics:• 6 surfaces• 16,383 tracks per surface• 63 sectors per track• 512 bytes/sector• Track-to-track seek time of 8.5ms• Rotational
29. Suppose a disk drive has the following characteristics:• 5 surfaces• 1,024 tracks per surface• 256 sectors per track• 512 bytes/sector• Track-to-track seek time of 8ms• Rotational
28. Suppose a disk drive has the following characteristics:• 4 surfaces• 1,024 tracks per surface• 128 sectors per track• 512 bytes/sector• Track-to-track seek time of 5ms• Rotational
27. Do you trust disk drive MTTF figures? Explain.
26. The disk specification in Figure 7.15 gives a data transfer rate of 60MB per second when reading from the disk, and 320MB per second when writing to the disk. Why are these numbers
25. By inspection of the disk specification in Figure 7.15, what can you say about whether the disk drive uses zoned-bit recording?
24. Verify the average latency rate cited in the disk specification of Figure 7.15. Why is the calculation divided by 2?
23. Why do differing systems place disk directories in different track locations on the disk? What are the advantages of using each location that you cited?
22. Why do you think the term random access device is something of a misnomer for disk drives?
21. Define the terms seek time, rotational delay, and transfer time. Explain their relationship.
20. If each interval shown in Figure 7.11 is 50ns, how long would it take to transfer 10 bytes of data?Devise a bus protocol, using as many control lines as you need, that would reduce the time
19. We pointed out that I/O buses do not need separate address lines. Construct a timing diagram similar to Figure 7.11 that describes the handshake between an I/O controller and a disk controller
18. With regard to Figure 7.11 and exercise 17, we have not provided for any type of error handling, such as if the address on the address lines were invalid, or the memory couldn’t be read because
17. The protocol for a certain data bus is shown in the table below. Draw the corresponding timing diagram. You may refer to Figure 7.11.Time Salient Bus Signal Meaning t0 Assert Read Bus is needed
16. If an address bus needs to be able to address eight devices, how many conductors will be required? What if each of those devices also needs to be able to talk back to the I/O control device?

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