Questions and Answers of Systems Analysis And Design Using MATLAB

13. Repeat Problem 12 to calculate the sensitivity of maximum tensile stress with respect to h.
14. A cantilevered beam shown in the figure is under a couple of 500 lb • in at the end. The optimi¬zation problem is to find a design that minimizes the cross-sectional area, while the maximum
1.1 Bearing in mind:• what you know about System Telecom and the reasons for setting it up;• its style of operation; and• the information in this chapter about business;what do you think would
1.2 Having identified some critical success factors, suggest ways in which new computer-based systems in System Telecom might help to achieve them.
1.3 Using the LozCo case study, draw a physical DFD.
1 Entity action step. Here, the developer examines the real world that the IS will model, and describes it in terms of the entities involved and the actions that they will perform or have performed
2 Entity structure step. This involves an examination of the time component of the IS. The actions performed by or on each entity are arranged in their time sequence.
3 Initial model step. So far, the method has described the real world. Now, a process model is built that simulates, as the IS will simulate, these real-world entities and actions.
4 Function step. Functions are now specified that will produce the outputs required from the system. If necessary, additional processes may be identified at this point.
5 System timing step. This involves the consideration of process scheduling to ensure that the system’s functional outputs are correct and are produced at the right time.
6 Implementation step. Finally, the hardware and software required to implement the IS are identified, and the model is transformed into a form suitable for operating in that environment.
2.1 System Telecom has chosen to use SSADM, and the data flow diagrams and data models are drawn using SSADM conventions. If you had been responsible for choosing a structured method for System
2.2 People are sometimes critical of structured development methods because they say that these methods increase the time and cost of the early stages of development. Do you think that this is true
2.3 Structured methods are said to improve communications between system developers and their customers (the users). Do you think that this is the case? Can you suggest ways in which this improvement
3.1 A particular application in System Telecom is giving cause for concern because of the increasing number of programming errors being found during its early operational life. Herr Norbert Rothaas
3.2 Assume now that you have completed the assignment. You’ve made your presentation to him and submitted your report, which he has accepted. You are now required to present to the user department
4.1 System Telecom has a policy of developing and using computer-based systems to give it commercial advantage. One of the consequences is that new systems need to be ‘developed on time, within the
4.2 It is said that the use of structured methods improves the quality of the developed system. Bearing in mind your understanding of ‘quality’, explain how structured methods contribute towards
4.3 Would it be useful for System Telecom to apply for ISO 9000 certification?What are the internal and external benefits that might come from certification, and what would be the cost of a
4.4 System Telecom has decided to buy an application package for its personnel system. There are several available to choose from and no particular advantage to be gained from developing a new system
5.1 As part of its expansion programme, System Telecom has brought forward the plan to develop a new system, and is setting up a temporary development team for it. The team will be disbanded once the
5.2 What techniques could be used during the systems development life cycle to ensure that the developed system meets its objectives?
5.3 It is said that user involvement during systems analysis and design is very important. Describe how users can be involved in analysis and design, and in the management of the project.
5.4 System Telecom supports a number of social benefit and charitable activities in the countries in which it operates. It has decided for the first time to support La Societé du Troisième Age
5.5 If you were the chairman of a local STA committee how would you monitor and control the progress of your committee's projects?
7.1 Imagine that you are the Personnel Director of System Telecom. Prepare the terms of reference for a project to develop a new personnel system.
7.2 Using the example of The Instant Image Corporation, how would you plan the approach to the systems analysis needed for the contract won by your computer services company? Take account of the
7.3 This chapter talks about face-to-face contact with the client and the need to build a good credible relationship. If you were an analyst meeting the System Telecom Personnel Director for the
8.1 In this chapter, five different methods for the collection of information have been described. They can be used separately or in combination during factfinding.Choose different circumstances from
8.2 Your boss is thinking about writing a book about data processing management. To help her come to a conclusion she has asked you to prepare a report identifying what’s involved in writing such a
8.3 During the fact-finding stage of a big project, different activities are carried out by different members of the project team: for example, some people may investigate processing requirements
9.1 The case study information you have shows a level 1 DFD and two level 2 DFDs for System Telecom. Using the level 2 DFDs as models, and the other case study information, draw a level 2 DFD for the
9.2 Having drawn the level 2 DFD for ‘Issue Bills’ write the elementary process description for one of the process boxes.
9.3 Using the level 1 DFD for System Telecom and other case study information, what are the major entities of the Customer Services System?There are more entities than this, so how have you chosen to
9.4 Having identified the major entities from the Customer Services System, choose one of them and identify the data items that make up that entity.
9.5 Read the Shark Loan Company case example and prepare a single level data flow diagram from it.
9.6 From the Ravenelli Ice Cream case example construct an entity model to support the ordering, accounting, manufacturing and purchasing of materials.
9.7 From the LozCo case example in Chapter 1, p. 33, construct a logical data structure diagram of the activities of LozCo.9.8 From the LozCo case example construct a physical DFD.
11.1 Using the entity description for ‘Bill’, which is shown below, the case study scenario and the level 1 DFD, identify the events that will affect the ‘Bill’entity during the lifetime of
11.2 Draw a partial entity–event matrix showing the effect of these events on this entity.
11.3 Draw the entity life history (ELH) for ‘Bill’.
11.4 Construct a limited entry decision table from the following description of a loan company’s activities.A loan company will offer loans to applicants based upon their age and their employment
11.5 Candidates for employment in an engineering company are recruited on the following basis. Construct a limited entry decision table of this process.Candidates for employment are accepted if they
11.6 Chapter 1 asked you to construct a physical DFD of the LozCo system.LozCo keep machine maintenance records that they update as shown below. Construct an entity life history (ELH) of the machine
12.1 The System Telecom LDS and DFDs that you have seen represent the selected business option: that is, they are for the preferred required system.Consider which areas of processing could have been
12.2 Identify the relative benefits and drawbacks of these options.
12.3 Using the Denton Motor Company case study in Appendix 1 perform the following requirements engineering tasks. A specimen answer is shown as an example on the form on p. 268.(a) Identify and
12.4 Using the headings People, Money, Information and Technology complete the SWOT matrix on the Denton Motor Company. The solution has been started below.
14.1 System Telecom relies very much on having its systems up and running when they are needed. How would you formulate a protection policy for the system described in the level 1 DFD? Remember to
14.2 Field sales representatives in System Telecom all use laptop PCs to send call reports or orders to their local office. They also receive sales information directly from the local office server.
17.1 Perform third normal form analysis on the following list of unnormalised data.Subscriber no Call no Telephone no Call date Rental start date Number called Bill start date Call period Bill end
17.2 Name the resultant relations and draw a partial data model.
17.3 Identify the types of key found during this exercise.
17.4 Showtime Cinemas own a number of cinemas that show different films. The data below is a report of the takings from different cinemas. Rearrange this data in 3NF tables.
18.1 What are the main issues to be considered when choosing a file organisation? What circumstances would make an indexed sequential organisation appropriate for a master file? Is there such a file
20.1 Convert the System Telecom LDS shown on p. 398 into an initial physical data design. Consider which primary and secondary key accesses may be required.
20.2 Consider which secondary key accesses may be required in this system.
21.1 Describe three different local area network protocols and identify the circumstances for their likely use.
21.2 LANS and WANS are used in different circumstances. What are the different circumstances for using them? When is one more appropriate than another?
21.3 One of the regional offices of System Telecom operates in South Western France as an ‘Agence’. It sells System Telecom products and services as well as other telecommunication products such
1.1. (a) Calculate the maximum unambiguous range for a pulsed radar with PRF of and ; (b) What are the corresponding PRIs?
1.2. 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 .200Hz 750Hz 5KW 20ms
1.3. A certain pulsed radar uses pulse width = 1us. Compute the corre- sponding range resolution.
1.4. An X-band radar uses PRF of 3KHz. Compute the unambiguous range, and the required bandwidth so that the range resolution is 30m. What is the duty cycle?
1.5. Compute the Doppler shift associated with a closing target with veloc- ity 100, 200, and 350 meters per second. In each case compute the time dilation factor. Assume that = 0.3m.
1.6. A certain L-band radar has center frequency 1.5GHZ, and PRFf, = 10KHz. What is the maximum Doppler shift that can be measured by this radar?
1.7. Starting with a modified version of Eq. (1.27), derive an expression for the Doppler shift associated with a receding target.
1.8. In reference to Fig. 1.16, compute the Doppler frequency for y = 150m/s, 0 = 30, and 0 = 15. Assume that = 0.1m.
1.9. A pulsed radar system has a range resolution of 30cm. Assuming sinu- soid pulses at 45KHz, determine the pulse width and the corresponding band- width.
1.10. (a) Develop an expression for the minimum PRF of a pulsed radar; (b) compute fr for a closing target whose velocity is 400m/s; (c) what is the unambiguous range? Assume that = 0.2m.
1.11. An L-band pulsed radar is designed to have an unambiguous range of 100Km and range resolution AR 100m. The maximum resolvable Doppler frequency corresponds to varget 350m/sec. Compute the
1.12. Compute the aperture size for an X-band antenna at fo = 9GHz. Assume antenna gain G = 10, 20, 30 dB.
1.13. An L-band radar (1500 MHz) uses an antenna whose gain is G = 30dB. Compute the aperture size. If the radar duty cycle isd, = 0.2 and the average power is 25KW, compute the power density at
1.14. For the radar described in Problem 1.13, assume the minimum detect- able signal is 5dBm. Compute the radar maximum range for =1.0, 10.0, 20.0m.
1.15. Consider an L-band radar with the following specifications: operating frequency fo 1500MHz, bandwidth B = 5MHz, and antenna gain G = 5000. Compute the peak power, the pulse width, and the
1.16. Repeat Example 1.4 with P, 1MW, G = 40dB, and = 0.5m.
1.17. Show that the DC component is the dominant spectral line for high PRF waveforms.
1.18. Repeat Example 1.5 with L = 5dB, F = 10dB, T = 500K, T = 1.5s,d, 0.25, and R = 75Km.
1.19. Consider a low PRF C-band radar operating at fo = 5000MHz. The antenna has a circular aperture with radius 2m. The peak power is P = 1MW and the pulse width is t = 2s. The PRF isf, = 250Hz, and
1.20. The atmospheric attenuation can be included in the radar equation as another loss term. Consider an X-band radar whose detection range at 20Km includes a 0.25dB/Km atmospheric loss. Calculate
1.21. Let the maximum unambiguous range for a low PRF radar be Rmax (a) Calculate the SNR at (1/2)Rmax and (3/4)Rmax. (b) If a target with = 10m exists at R = (1/2)R what should the target RCS be at
1.22. A Milli-Meter Wave (MMW) radar has the following specifications: operating frequency fo = 94GHz, PRFf, = 15KHz, pulse width = 0.05ms, peak power P, = 10W, noise figure F = 5dB, circular antenna
1.23. Repeat Example 1.5 with 2 = 4, 6 = 1m, and R = 400 Km.
1.24. Using Eq. (1.80), compute (as a function of B,/B) the crossover range for the radar in Problem 1.22. Assume P, = 100W, G, = 10dB, and L, = 2dB.
1.25. Using Eq. (1.80), compute (as a function of B,/B) the crossover range for the radar in Problem 1.22. Assume P, = 200W, G, = 15dB, and L = 2dB. Assume G' = 12dB and R, = 25Km.
1.26. A certain radar is subject to interference from an SSJ jammer. Assume the following parameters: radar peak power P, = 55KW, radar antenna gain G = 30dB, radar pulse width = 2s, radar losses L =
1.27. A radar with antenna gain G is subject to a repeater jammer whose antenna gain is G,. The repeater illuminates the radar with three fourths of the incident power on the jammer. (a) Find an
1.28. Using Fig. 1.30 derive an expression for R,. Assume 100% synchro- nization between the transmitter and receiver.
1.29. An X-band airborne radar transmitter and an air-to-air missile receiver act as a bistatic radar system. The transmitter guides the missile toward its tar- get by continuously illuminating the
1.30. Repeat the previous problem when there is 0.1dB/Km atmospheric attenuation.
1.31. Consider an antenna with a sinx/x pattern. Let x = (Trsine)/x. where r is the antenna radius, & is the wavelength, and 8 is the off-boresight angle. Derive Eq. (1.100). Hint: Assume small x,
1.32. Compute the amount of antenna pattern loss for a phased array antenna whose two-way pattern is approximated by f(y) = [exp(-21n2(y/03))1 where 3dB is the 3dB beam width. Assume circular
1.33. A certain radar has a range gate size of 30m. Due to range gate strad- dle, the envelope of a received pulse can be approximated by a triangular spread over three range bins. A target is
1.34. Compute the amount of Doppler filter straddle loss for the filter defined by 1 H(f) 1+a Assume half-power frequency f3dB 500Hz and crossover frequency fc = 350Hz.
2.1. Design a cylindrical RCS calibration target such that its broadside RCS(cylinder) and end (flat plate) RCS are equal to at . The RCS for a flat plate of area is .
2.2. The following table is constructed from a radar cross-section measurement experiment. Calculate the mean and standard deviation of the radar cross section.2 55 6 67 12 73 16 90 20 98 24 110 26
2.4. The backscattered RCS for a corner reflector is given by This RCS is symmetric about the angle . Develop a MATLAB program to compute and plot the RCS for a corner reflector. The RCS at the is
3.1. Prove that.
3.2. Show that . Hint: You may utilize the relation.
3.3. In a multiple frequency CW radar, the transmitted waveform consists of two continuous sinewaves of frequencies and .Compute the maximum unambiguous detection range.

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