IT 402 Saudi Electronic University Fantastic Pastry Shop Case Study

Description

FANTASTIC PASTRY SHOP CASE STUDY

Introduction about Fantastic Pastry Shop:

Fantastic Pastry Shop is a traditional pastryshop established in 1999. It isa small shop owned by two persons. One of them was responsible for buying goods and bringing them to the shop two times a day (every morning and late afternoon). The other one is managing the shop activities and organizing shifts for employees. They work 24/7 and have three shifts. They employ well-experienced employees in each shift. The shop has three chefs for making the dough and sauce, three well-trained employees for preparing and putting the ingredients, and three well-trained employees for cooking the pastry andcontrolling the oven heat.The owners work on this shop and have other employees to help them.

The order process in Fantastic Pastry Shop:

The process starts by welcoming the customer and giving them the menu. The customer looks into the menu then places their order. The cashier writes down the order on a separate paper for each customer, calculates the prices, and then asks the customer to pay (4minutes). After getting the payment, the cashier handed the paper of each order to the second employee. The next employee then starts to prepare the dough based on the order (the shop has two bases of dough: white flourdoughand brown wholemeal flour dough)(4 minutes). The next employeeis responsible for filling the pastry with the ingredients based on each customer’s order (2minutes). The nextemployee takes the pastry, puts it into the oven until it is ready, and then gets it back (2minutes for white flourbase and 4minutes for brown wholemeal flour base). The last employee cut the pastryand packages it then hands it to the customer (2minutes).

The current situation of Fantastic PastryShop:

The shop starts to get a lot of orders that are over its capacity due to its reputation. It usually gets around 20 orders from persons coming to their shop in each hour. Each order – on average – includes 3-5 pastries of different bases and ingredients. However, the shop lost a couple of its experienced employees responsible for preparing and cooking pastries.

The Issues in Fantastic Pastry Shop:

The Fantastic Pastry Shop was very successful and had many customers and significant revenue. However, the shop starts to lose many of its loyal customers and receives a considerable number of complaints. The managers started to investigate the complaints they received. They also contacted their loyal customers to understand the different issues more clearly. After this deep investigation, they categorized the issues into the following categories:

• Some of the pastry’sbases and ingredients are unavailable in the early afternoon or late night.

• The waiting time becomes unacceptable to customers.

• The quantity of ingredients is not always the samewhich affecting the taste of the pastry.

• The brown wholemeal flourbaseof pastries is sometimes undercooked.

• The customers sometimes get some of their pastriescold.

• The customers sometimes get the wrong order.

The requirements to solve Fantastic Pastry Shop process issue:

Besides the available information, you are expected and allowed to make assumptions, if you need, to improve the process and solve the issue of the Fantastic Pastry Shop.

You are requested to solve the issue of the Fantastic Pastry Shop and improve its process and performance by answering the following questions.

5 Marks

Learning Outcome(s):CLO1: Explain the interdisciplinary concepts, theories, and trends in ES and their role in supporting business operations.Question One

Explain the main Input, Process Activities, and Output of the Fantastic Pastry Shop Process. Then, calculate the current cycle time of the process?Also, calculate the throughput for this process in 1 hour?Further, find out the bottleneck activities?

4 Marks

Learning Outcome(s):CLO4:Design ES architectural models for various business processes.

Question Two

Model current (As-Is) process using BPMN 2.0 utilizing any tool such as Visio?Thenanalyze As-Is process fromboth time and quality perspectives (mention at least 1 issue related to time and 1 issue related to quality in the process)?

6 Marks

Learning Outcome(s):

CLO3:Discuss the issues and challenges associated with implementing ES and their impacts on corporate enterprises.Question Three

Suggest at least 3 ideasfor improving the current processfrom the following perspectives: a) employees’perspective, b) equipment’s’ perspective,and c) IT & IS technologiesperspective?Also explain how yoursuggestions will solve Fantastic Pastry Shop issues?Finally, propose the To-Be processmodel using BPMN 2.0 by utilizing any tools?

Essex County College What is a Tunnel & Types of them Discussion

Description

answer the following with one paragraph –> What tunnel linings, primary and secondary can, be used in soft ground and rock tunnels? Under what conditions would each be selected? A major part of tunnel design has to do with linings. It is important for you to understand the various types of linings that may be used in certain types of tunnels and how they change with the type of rock or soil encountered. answer the following in a separate document –> In Florida, the Intercostal Waterway runs along the east coast. In order to cross the waterway, the State of Florida elects to use bridges for road traffic. This means that the bridges need to be quite high at the center to allow the passage of sailboats. What would be the advantages and disadvantages in using immersed tubes instead?

Immersed tube tunnels generally are the most advantageous for crossing a river or body of water. You should be aware of the application of this method and the different steps of assembly of the pieces. You should consider the advantages and disadvantages of using this type of tunnel. Look at the use of immersed tube tunnels versus excavated tunnels. Address questions such as where are the portals, how deep should the tunnel be and the like. answer the following in one paragraph —> You are faced with a significant claim related related to discovery of a previously unknown underground storage tank (it was not shown on the drawings and was not included in the scope of work) that has created has caused the project to stop. In order to remove the tank, the General Contractor was directed to hire a Subcontractor and file a permit with the municipality. It took the three weeks to mobilze the Subcontractor. When the Subcontractor started work, they were ordered to stop of the Building Inspector because the permit application was not submitted, which two weeks to approve. When the Subcontractor started work it took two weeks to complete the work.

Please answer the following questions:

1. What is the duration of the compensational delay

2. What is the part of the delay is the General Contractor is responsible for?

3. What measures could be taken to prevent the delay? answer the following in a separate document —> The following are some suggested term projects that you may select. You may select another if you choose. Please avoid the Lincoln and the Holland Tunnels. Select a topic that interests you. The term paper should be 10 pages which include the write-up, drawings, photos and references. Prepare the report as you would for a professional project. Neat, correct spelling and grammar are required.

The following are some suggested topics:

  1. A specific tunnel project mixed face using shields, tunnel boring machine such as the Sekain Tunnel, the BART Tunnels or the Cumberland Gap Tunnel.
  2. A historic tunnel such as those by the Romans, the St. Clair Tunnel, or the Hoosac Tunnel.
  3. Methods of excavation for soft ground tunneling, hard rock.
  4. Mixed face using shields, tunnel boring machine, drill and blast, roadheader, earth pressure balanced, slurry shield.
  5. Tunnel problems such as fire, flooding or cave-ins.
  6. Subways as in Paris, NYC, Washington D.C., San Francisco, Taiwan.
  7. Water tunnels, railroad tunnels, immersed tube tunnels.
  8. People important to tunneling or tunnel disasters.
  9. Channel Tunnel, Fort McHenry Tunnel, or soft ground tunnels.
  10. Chesapeake Bay Bridge Tunnel, Penn Station Tunnels, Detroit Windsor Tunnel.
  11. Tunnel types such as immersed tube, microtunneling, rock tunnels. This term project should include a bit of history concerning your selected topic. It should describe the current status and what is proposed for the future. For people, address their background and how they came to develop their contribution to the industry.Any source material should be documented. The 10 page report should be neat and professional looking. Photos and drawings and charts should be neat and readable. A total score of 100 points may be given, and this represents 20% of your final grade.

Rasmussen University Professional Contractor Consultant Report Paper

Description

Assignment Brief

Introduction

Please read this assignment brief carefully, to enable you to do the task. The task for this assignment is to prepare a professional contractor’s consultant report approximately 3,000 words in length referenced appropriately, relating to the contractual solutions available to the contractor on various projects they run.

This is an individual assignment, which carries 50% of the unit marks.

You also need to include the coursework self-assessment sheet

Scenario

You are employed as a consultant by a medium-sized contractor specialised in the construction of warehouses, industrial units and office buildings. Your employer asked you to give them some advice on construction law and regulations, examine issues faced on two projects, and produce a report advising them on the way forward.

Tasks

For this report, you need to complete the following tasks.

Construction Law and Regulations

Tasks

  • Your employer wants to know more about Section 108 of the Housing Grants, Construction and Regeneration Act 1996. Your employer understands that the Construction Act 1996 confers the right to adjudication where a dispute relating to a qualifying construction contract exists and also sets out the minimum requirements for the contract provisions in respect of adjudication to comply with the Act.

Your employer asked you to:

  • Review and explain the nature of those requirements. [Total Mark 15]
  • Your task is to compare and contrast the provisions of the Health and Safety at Work Act 1974 and the CDM Regulations 2015, identifying the purpose of both and critically appraising the relevance of the two statutory provisions to construction projects (Office Building Project and Warehouse and Offices Project).

2.Your employer instructed you to examine the law which applies to construction projects in respect of health, safety, and welfare.

[Total Mark 10]

Office Building Project

Your employer is contracted to build an office building. This project commenced two months ago. The work is proceeding well. Last month the client’s QS prepared an interim valuation which was agreed and certified by the contract administrator a few days later within the terms of the contract.

As a result of a series of administrative errors, your employer, the contractor, has not received payment for valuation number one, which was due a week ago.

Task

Advise your employer on the obligations of the client in terms of payment. Assess the remedies under the contract which are available to your employer in this situation. Suggest with justification the most appropriate course of action.

Note: The contract is a standard form of contract. In your answer, you are free to assume whether the contract is JCT16 or NEC4.

[Total Mark 30]

Warehouse and Offices Project

They have won a contract to construct a warehouse and offices for a freight delivery company.

A dispute has arisen concerning some of the load test results for the piling works, a small number of which have not met design requirements. Your team are sure this work is in accordance with the specification but the client’s representatives have insisted that they have witnessed faulty workmanship and want to find a solution urgently.

An interim valuation has recently been certified and will be due for payment in ten days, however the client is insisting that no further payments should be made until this matter is dealt with.

The contract is a standard form of contract, which provides for both adjudication AND arbitration and the Project Manager has suggested that both parties resort to arbitration and waive their right to adjudication.

Task

Prepare a brief outlining the various problems raised by this situation and the means by which the contract documentation deals with them. Recommend the procedures that should be adopted by the parties to provide a solution.

Note: In your answer, you are free to assume whether the contract is JCT16 or NEC4.

[Total Mark 45]

Note

To complete the tasks above, you may need to make some assumptions – please highlight these in your report.

The Sorts of Decision Making Processes and Computer Systems Question

Description

1. A small bookstore hired you to build its database. You have to create a new Access Database with the following entities and attributes:

Author: AuthorID, ALastName, AFirstName.

Book: BookID, BookTitle, AuthorID, ISBN, Price, Edition, CopyrightYear, Description

Customer: CustomerID, CLastName, CFirstName, CStreet, CCity, CState, CZipCode, CPhone, CEmail,

Order: OrderID, CustomerID, OrderDate

OrderDetail: OrderID, IDOrderDetail, BookID, QuantityBook

Enter 5 records on the entities: Customers, Books, Authors, and Orders: and enter a different number of details for each order.

2. Voice-based artificial intelligent devices are not just jukeboxes with attitude; in fact, they just might be the primary way we interact with all future machines. August 31, 2012, was the date four Amazon engineers filed the patent for Alexa, an artificial intelligence system designed to engage with one of the world’s biggest and most tangled datasets: human speech. The patent had a simple diagram and 11 words. “Please play ‘Let It Be’ by the Beatles.” A small device replies “No problem, John,” and the song begins playing. Millions of Alexa machines were sold when the device debuted in 2014. Home-based Al systems are turning out to be big business as banks, universities, law firms, and so on compete to create simple devices that people can talk to directly. What makes voice-based Al so appealing to consumers is its promise to conform to us, to respond to the way we speak and think-without requiring us to type on a keyboard or screen. That’s also what makes it so technically difficult to build. We aren’t at all orderly when we talk. Instead, we interrupt ourselves. We let thoughts dangle. We use words, nods, and grunts in odd ways, and we assume that we are making sense even when we are not. Thousands of Amazon staffers are working on this challenge, and the company currently lists over 1,100 Alexa job requests on its website. Machine learning techniques reexamined thousands of exchanges in which Alexa stumbled. With Alexa’s usage surging, Amazon now has access to an expansive repository of human-computer speech interactions, giving it an edge in fine­tuning its voice technology. External data adds value, such as a massive database of song lyrics loaded into Alexa in 2016, helping ensure if you ask for the song with “drove my Chevy to the levee,” you will be steered to Don McLean’s “American Pie.” Of course, with all technology, there are bugs and glitches. I am sure you have heard of the frightening Alexa rogue laughter that was happening in people’s homes during the night. Amazon stated Alexa’s random laugh that was creeping customers out was the result of Alexa mistakenly hearing the phrase “Alexa, laugh.” Amazon changed the phrase to “Alexa, can you laugh?” which is less likely to have false positives, and disabled the short utterance “Alexa, laugh.” Amazon also reprogrammed Alexa’s response from simply laughter to “Sure, I can laugh,” followed by laughter. This confirms the theory that Alexa was falsely triggered and not possessed. While it’s promising the company issued a fix, that probably isn’t enough to comfort users who allegedly heard Alexa laughing for no reason in the middle of the night. 1. Define the three primary types of decision-making systems and how machine learning technology could help transform decision-making. 2. Identify how machine learning can transform a traditional business process such as checking out of a grocery store. 3. Explain the relationship between bias and machine learning for Alexa. 4. Argue for or against the following statement: Machine learning systems like Alexa invade user privacy.

ENGL 1302 Odessa College Climate change and Mental health Annotated Bibliography

Description

Module Two: Annotated Bibliography Content

  • Barrett, Charles Kingsley. The Gospel According to St. John: An Introduction with Commentary and Notes in the Greek Text. 2nd ed. Westminister John Knox Press, 1978.
    This commentary contains detailed exegesis of the Greek text that is worth considering regardless of whether one agrees with all of Barrett’s conclusions. The author provides a lengthy introduction (146 pages), including discussions on the historical, theological, and linguistic aspects of this book. These categories will aid in the research being conducted by providing a logical breakdown of subcategories. Barrett himself is one of the greatest English language commentary writers of the twentieth century. However, he follows some older views on John’s Gospel regarding source and background that would be difficult to find anywhere else, thus providing useful information to the research.
    Brown, Ottilioa, and Juliet Robinson. “Resilience in Remarried Families.” South African Journal of Psychology, vol. 42, no. 1, 2012. Pp 114-126.
    This article reports on a salient research study in which the target was to identify and explore the resiliency factors that enable blended families to adjust and adapt. It involved a total of 35 participants: 19 parents and 16 adults. Descriptive statistics were used to analyze the biographical information. This information will help hone down the research by looking at specific numbers of people affected by remarriage. This source also uses correlation analysis to analyze the quantitative data: and content analysis was used to analyze the qualitative data. The research found that family hardiness, problem solving, communication, family time, and routines showed a positive correlation for both parties. Common themes between the teen and parents such as spirituality, boundaries, communication, flexibility and tolerance also had a strong positive correlation between both. This will help in proving the research essay’s main point that these aspects are interconnected. The journal is a peer-reviewed journal. Ottilia Brown is also the author of other academic journal articles on learning disabilities and ADD. The author appears well-versed and knowledgeable on the topic at hand.
    Lamott, Anne. Bird by Bird: Some Instructions on Writing and Life, Anchor Books, 1995.
    Taking a humorous approach to being a writer, this book is wry and anecdotal and offer advice on the writing life from plot development to jealousy, from perfectionism to struggling with one’s own internal critic. In the process, Lamott includes fun and productive writing exercise. She offers sane advice that will be useful in showing how those that struggle with writing anxieties are able to cope. However, her main goal seems to be offering readers a reality check regarding writing, publishing and struggling with one’s imperfections in the process. It’s not a dry handbook of writing and/or publishing, but it is indispensable because of its honest perspective, down-to-earth humor, and encouraging approach. Parts of it could easily be included in the curriculum for a writing class. Several chapters in Part 1 address the writing process and would serve to generate discussion on students’ own drafting and revising processes. Her research is invaluable when looking at how writing can be both engaging and enjoyable.

University of Kansas Variation Reduction and Statistics Questions

Question Description

I’m working on a mechanical engineering multi-part question and need an explanation and answer to help me learn.

1. Using the following sample data, calculate the mean, mode, median, min., max, standard deviation, and range

1.116

1.123

1.133

1.117

1.124

1.119

1.129

1.121

1.128

1.122

1.122

1.125

1.121

1.136

1.127

1.125

1.124

1.122

1.125

1.123

1.118

1.123

1.122

1.122

1.119

Note: Excel Spread sheet also has function in finding these values; mean (average), mode, median, min, max, standard deviation (stdev), and range
Top menu, click “Formulas”, then “Insert Function” (on your far left), then you will see a box. Select a category, “Statistical” from a drop-down menu.

2. If the average wait time is 12 minutes with a standard deviation of 3 minutes, determine the percentage of patrons who wait less than 15 minutes for their main course to be brought to their tables.

3. The thickness of a part is to have an upper specification of 0.925 and a lower specification of 0.870 mm. the average of the process is currently 0.917 with a standard deviation of 0.005. determine the percentage of product above 0.93 mm.

4. The data below are X-bar and R values for 25 samples of size n = 4 taken from a process filling bags of fertilizer. The measurements are made on the fill weight of the bags in pounds.  

Sub group number

X-bar

Range

1

50.3

0.73

2

49.6

0.75

3

50.8

0.79

4

50.9

0.74

5

49.8

0.72

6

50.5

0.73

7

50.2

0.71

8

49.9

0.70

9

50.0

0.65

10

50.1

0.67

11

50.2

0.65

12

50.5

0.67

13

50.4

0.68

14

50.8

0.70

15

50.0

0.65

16

49.9

0.66

17

50.4

0.67

18

50.5

0.68

19

50.7

0.70

20

50.2

0.65

21

49.9

0.60

22

50.1

0.64

23

49.5

0.60

24

50.0

0.62

25

50.3

0.60

Set up the X-bar and R charts on this process. Interpret the charts. Does the process seem to be in control? If necessary, assume assignable causes and revise the trial control limits. If the average fill of the bags is to be 50.0 pounds, how does this process compare?

5. A hospital is using X-bar and R charts to record the time it takes to process patient account information. A sample of five application is taken each day. The first four weeks’ (20 days’) data give the following values:

X-bar-bar = 16 min  R-bar = 7 min

If the upper and lower specifications are 21 minutes and 13 minutes, respectively, calculate 6? , Cp, and Cpk interpret the indices.

6. For the data in question 4, calculate ? , Cp, and Cpk interpret the indices. The specification limits are 50 ± 0.5.

7. Determine the failure rate ? for the following: You have tested circuit boards for failures during a 500-hour continues use test. Four of the 25 boards failed. The first board failed in 80 hours, the second failed in 150 hours, the third failed in 350 hours, the fourth in 465 hours. The other boards completed the 500-hour test satisfactorily. What is the mean life of the product?

8. A power station has installed 10 new generators to provide electricity for a local metropolitan area. In the past year (8,760), two of those generators have failed, one at 2,460 hours and one at 5,962 hours. It took five days, working 24 hours a day, to repair each generator. Using one year as the teest period, what is the mean time between failures for these generators? Given the repair information, what is the availability of all 10 generators?

***************************************

Arizona Automotive Institute Fatal Construction Accident Report and Presentation

Description

  analyze a fatal construction accident and create a REPORT and SHORT PRESENTATION.

 TO ANSWER THESE:1.         Chart that shows the Chain of Events, conditions, and causal factors Use an event-based causal chart like the one described in the posted paper “Root Cause Analysis for Beginners” and try to identify as many relevant causal factors as you can.  Indicate the relevant events, conditions and actions.  Provide a description of the incident that accompanies the chart.Indicate the causal factors on the chart (similar to the class example)2.         Root cause analysis (Why it happened)You should consider the following possible causal factors.  To investigate causes, use the questions listed in the “Incident Investigation Guide.”  Human factors:  What operation was the worker(s) performing? How? Did the worker perform safe, unsafe acts, errors, violations? Try to explain why the worker(s) acted the way they did.  Use the Human Factors framework:  Task Demands, Work environment, Individual capabilities, and Human nature.  What factors were likely to influence the actions in the case?Production system:  What were the elements of the production system that influenced the course of events, actions, conditions, etc.   Work method, work organization, tools and equipment, material, jobsite organization, preparation, production goals and pressures, task assignments, production controls, supervision, etc..Environment:  What is the role of the physical and production environment?Management role (the injured worker’s management).  How management’s actions/inactions affected the conditions, actions and events of the case.  Safety systems training, personnel management, Jobsite management, supervision.  What were the conditions on the job? What was the hazards involved? How was the hazards addressed/managed3rd parties: How did others (coworkers, other trades, designer, owner, GC, etc.) influence the events?PRIORITIZE THE CAUSES you identified in order of importance.3.         Allocate responsibility   Allocate responsibility to (1) the Worker, (2) the worker’s Employer, and/or (3) 3rd Parties. The total should be 100%.Justify your allocation:  Indicate the responsibilities of the different parties. Identify and cite the relevant OSHA regulations and standards.  Indicate WHO was in violation of what standards. 4.         Propose and prioritize controlsHow would you plan and control the operation to prevent such accidents?  What actions / conditions can be most effective in preventing them?You can propose several solutions. Use the hierarchy of controls to identify and prioritize solutionsWho was in the best position to prevent the accident?  What actions/changes are needed and by whom?Remember that the most effective interventions involve controlling the conditions, rather than the workers’ actions.Prioritize the solutions in order of effectiveness. 

UMGC Migration From Windows to Linux Memorandum

Description

Faster Computing was impressed with your presentation. The company is interested in moving forward with the project, but the senior management team has responded to the presentation with the following questions and concerns:

(12.3.2: Describe the implementation of controls.)

  • How will security be implemented in the Linux systems—both workstations and servers?

(10.1.2: Gather project requirements to meet stakeholder needs.)

  • End users have expressed some concern about completing their day-to-day tasks on Linux. How would activities such as web browsing work? How would they work with their previous Microsoft Office files?

(12.4.1: Document how IT controls are monitored.)

  • The current Windows administrators are unsure about administering Linux systems. How are common tasks, such as process monitoring and management, handled in Linux? How does logging work? Do we have event logs like we do in Windows?

(2.3.2: Incorporate relevant evidence to support the position.)

  • Some folks in IT raised questions about the Linux flavor that was recommended. They would like to see comparisons between your recommendation and a couple of other popular options. What makes your recommendation the best option?

(10.1.3: Define the specifications of the required technologies.)

  • How does software installation work on Linux? Can we use existing Windows software?
  • How can Linux work together with the systems that will continue to run Windows? How will we share files between the different system types?

The deliverable for this phase of the project is a memo. There is no minimum or maximum page requirement, but all of the questions must be fully answered with sufficient detail. The recommended format is to respond to the questions in a bulleted format. Provide sufficient detail to fully address the questions. You must cite at least two quality sources.

(1.2.3: Explain specialized terms or concepts to facilitate audience comprehension.)

Create a memorandum template with a header of your own design or choosing, brief introduction, addresses Faster Computing, Inc’s questions, and summarizes your position on adopting the specific version of Linux.

(1.4.3: Write concise and logical sentences in standard academic English that clarify relationships among concepts and ideas.)

Your memorandum should not include spelling or grammatical errors. Any Linux commands must be displayed in lower case. Information technology acronyms (e.g., SSH or FTP) should be explained for the reader.

Hudson County Community College Sustainability and Sustainable Construction Report

Description

Research report about (sustainability and sustainable construction)

he give us two just choose one 1.  Design a roller coaster. Coaster Specifications:  Roller coaster must include at least (1) one circular track, where the track goes in a spiral motion.  Determine the bank angle such that the only force on the rider is the normal force from the seat. Coaster must also must include (2) one inversion (an upside down part).  Calculations: Calculations to perform as a function of time:1. velocity2. acceleration3. Normal force of seat on passenger4. Max g-force on passenger, bank angle.Additionally, not as a function of time (1) height of the initial drop must be determined in addition to (2) the force required to slow down the motion (and the time the force is applied) must be determined to bring the coaster to rest (don’t design it so it runs out of gravitational energy at the end, this could result in a stuck car for a lighter person).  The normal force on the rider from the seat must be greater than zero to ensure that the passenger does not fall out. Calculations must be performed for someone in the 95 percentile of weight and in the 40 percentile of weight.  Neglect the size of the rider, track friction and air resistance.  Restrictions: The maximum G-load (acceleration) experienced by a person should be no more than 5 g’s.  This is equivalent to a normal force of 5mg, based on the mass of the person.  Final report includes:(1) Drawing of coaster, including dimensions (height, radius of curvature, bank angle, where appropriate).  For 2D drawings, at least two perspectives (top and side view).(2) Two spreadsheets:  including the calculations as a function of time for large mass and small mass rider (95 percentile and 40th percentile)(3) Brief summary of coaster, calculations and process of designing.  2.  Design a project.You can come up with a dynamics project based on your own interests.  You can choose any of the topics we have covered to date, or combine them all.  A more difficult project will be worth more points. 

Morgan State University Discrete Systems Project Worksheet

Description

Exercise 1: Filtering a random signal by direct convolution

Write a MATLAB program to
(a) Generate a random input signal of 50 samples whose amplitude is uniformly distributed between -4 and 5;
(b) Process the input signal by direct convolution using the following filter impulse response:
h(n) = {1/8, 1/4, 1/4, 1/4, 1/8}
(c) Plot the input and output signals on the same graph and explain what the filtering effect is.

Exercise 2: Filtering a multi-frequency signal
Let’s consider the following analog signal
x(t) = 0.3sin(4000?t)+sin(10000?t)+0.4sin(16000?t)
Write a MATLAB program to
(a) Sample the analog signal at 60 kHz for a duration of 10 msec.
(b) Process the input signal using the given filter impulse response h in the given code (see attached additional sample codes).
(c) Plot the input and output signals (as function of time) on the same figure using the stem and plot functions.

Exercise 3: Noise filtering using Fast Fourier Transform
(a) Create a signal with sum of two sinusoids and add some noise.
Sample code:
dt = .001;
t = 0:dt:1;
f = sin(2*pi*50*t) + sin(2*pi*120*t); % Sum of 2 frequencies
f = f + 2.5*randn(size(t)); % Add some noise
(b) Plot the original signal (before noise is added) and plot the noisy signal.
(c) Compute the Fast Fourier Transform of the noisy signal and its Power Spectral Density
Sample code:
n = length(t);
fhat = fft(f,n); % Compute the fast Fourier transform
PSD = fhat.*conj(fhat)/n; % Power spectrum (power per freq)
freq = 1/(dt*n)*(0:n); % Create x-axis of frequencies in Hz
L = 1:floor(n/2); % Only plot the first half of freqs
(d) Use the Power Spectral Density to filter out noise
Sample code:
indices = PSD>100; % Find all freqs with large power
PSDclean = PSD.*indices; % Zero out all others
fhat = indices.*fhat; % Zero out small Fourier coeffs.
ffilt = ifft(fhat); % Inverse FFT for filtered time signal
(e) Produce plots for both the filtered and unfiltered Power Spectral Density with respect to frequencies
(f) Plot the recovered time domain signal and explain this filtering procedure in your own words.