Case studies offer a practical problem for which you supply a written solution. There is not always a specific right or wrong answer to these cases. They are intended to encourage you to review the chapter material and delve deeper into the topics you have learned.

One of the primary reasons networks were built was to facilitate the sharing of information. Organizations want to share files and printers in Windows, Linux,and Mac OS X. However, organizations need to ensure they maintain secure access to shared files. This is often accomplished using user and group accounts, with assigned permissions. These permissions determine who can access the shared resources and what type of access they have.

Consider a GaAs p-n junction diode. The p-type acceptor is Zn, with a dopant concentration of 2 x 10^17 cm^-3 and the n-tpye donor is Si, with a dopant concentration of 5 x 10^16 cm^-3. Working at temp= 300 K.

a) Calculate the Fermi Level in the p-type material. Assume that the hole density is equal to the density of the p-dopant atoms.

b) Performing the same calculation for the n-type material gives a fermi level of 1.363 eV. What is the zero-bias built- in potential at the junction?

c) Calculate the width of the depletion zone for this case

A craftsman builds two kinds of birdhouses, one for wrens and one for bluebirds. Each wren birdhouse takes 3 hours of labor and 4 units of lumber. Each bluebird house requires 2 hours of labor and 10 units of lumber. The craftsman has available 80 hours of labor and 100 units of lumber, and he wants to build at least 6 wren houses. Wren houses profit $8 each and bluebird houses profit $16 each. How many of each kind of birdhouses should be built in order to maximize total profit?  Formulate this as a linear programming problem (i.e., DO NOT solve it.)

Write a program that takes a string from the user, identifies and counts all unique characters in that given string. You are bound to use only built-in string functions where necessary. For identification of unique characters and for counting of the characters make separate functions.

For character identification

Develop a program that takes a string argument, and returns an array containing all unique characters.

For character counting

Develop a program that takes an array returned from above function as an argument along with the given string and return an array containing the total count of each uniquely identified character present in the argument array.

(Dev Cpp +Multifing )

Consider a GaAs p-n junction diode. The p-type acceptor is Zn, with a dopant concentration of 2 x 10^17 cm^-3 and the n-tpye donor is Si, with a dopant concentration of 5 x 10^16 cm^-3. Working at temp= 300 K.

a) Calculate the Fermi Level in the p-type material. Assume that the hole density is equal to the density of the p-dopant atoms.

b) Performing the same calculation for the n-type material gives a fermi level of 1.363 eV. What is the zero-bias built- in potential at the junction?

c) Calculate the width of the depletion zone for this case

You would like to setup a website to sell towels, linens, pottery, and tableware from Portugal and are examining services for hosting small business internet storefronts. Your website should be able to take secure credit card payments and calculate shipping costs and taxes. Initially, you would like to display photos and descriptions of 40 products. Visit Yahoo! Small Business, GoDaddy, and iPage and compare the range of e-commerce hosting services they offer to small businesses, their capabilities and their costs.

Examine the tools they provide for creating an e-commerce site.

Compare these services and decide which you would use if you were actually establishing a web store.

Write a brief report indicating your choice and explaining the strengths and weaknesses of each service.

Internal Control : Performance Measures

Essex Engineering

Topic: Performance measures,

Essex is an industrial company with three divisions. Both the Midland Division and the North Division are long established. Senior managers are concerned that these divisions have a high percentage of products that are near the end of their product life-cycle. Forecast sales increases over the next 5 years is expected to be in the region of 4-5% per annum.

The East Division was acquired in 1999 and senior managers are optimistic that this division has very good growth potential. Most of the senior managers at this division have experience of working at the other divisions.

Since 1999 the head office has ranked all divisions according to return on investment (ROI) and residual income (RI). All managers believe that the rankings are important for future promotions and career development.

A small number of other performance measures are also used by managers. These include

These performance measures were agreed by all managers in 1999. At the time it was thought that managers should focus on only a small number of measures.

2002

The managers at the divisions provided the following information for the head office.

Selected data from the budgeted Management Accounts to 31 December 2002

Other measures

The head office has estimated that the group cost of capital is 10%

Ranking divisions in 2000

In 2000 the data on controllable and non-controllable costs and investments will be used to rank divisions.

Questions

Question 1

Based on the data provided comment on the relative financial performance of the two divisions and discuss how the ranking of the divisions changes if controllable and non-controllable costs and capital employed are analysed. (provide the calculation to prove your standpoint)

Question 2

Evaluate the choice of performance measures for the 3 divisions

Question 3

Identify and evaluate the difficulties faced by managers when measuring capital employed for a division.

Question 4

Discuss how using ROI can result in managers making poor investment decisions.

ROI has some built in biases that can lead managers to make poor decisions. First, ROI requires that all costs and benefits be stated in dollars. Because it is usually easier to quantify costs than benefits, ROI measurements can be biased in a way that gives undue weight to costs. Second, ROI focuses on benefits that can be predicted. It also tends to emphasize short run benefits over long run benefits. This biases ROI calculations to weigh short term costs and benefits more heavily than long term costs and benefits.

Question 5

Discuss the particular problems multinational companies have when evaluating the performance of divisions.   

The government of Ivarrona has put in place an advanced telecommunications network that can support upload and download speeds of 1 gigabit (roughly 100 times faster than today’s average internet speeds). They are now ready to launch a Telemedicine service that will allow physicians to reach and treat (where possible) patients that cannot reach a doctor’s physical location or a hospital easily. They are ready to roll out a special package called ‘i-MediConnect’ consisting of a laptop, a high quality digital camera and a microphone system that can be plugged into any handheld device or laptop (it can run on Windows, MacOS, Linux, etc. and works on almost all major platforms). They plan to distribute this free to all physicians and clinicians (and to hospitals) that will participate in the program. They also plan to install these in thousands of special purpose kiosks built all over the country (Ivarrona). In addition to the i-MediConnect package, these Kiosks will also have devices that can capture many important elements of patient vitals – including blood pressure, A1C levels, body temperature, etc. (assume that it can do some body fluid capture and analysis too).

The total cost of manufacturing n Kiosks by the government is given by: 100 + 2√n

The total cost of setting up m Kiosks by the government is given by: 50 + (m/4)

Answer the following questions based on the information above. Sample Question 2 (a): Only one of the following alternatives is correct. Identify the correct alternative.

1. The manufacturing of these Telemedicine Kiosks is characterized by scale economies.
2. The average cost of manufacturing n units of the kiosk is increasing in n.
3. The total cost of manufacturing n units of the kiosk is decreasing in n.
4. The average cost of manufacturing n units of the kiosk is constant (neither increasing nor decreasing in n).

A third-party company offers to manufacture and set up, up to 10,000 Kiosks for a total fixed fee of 2750 (disregard currency units). Thereafter, for additional Kiosks it will charge a combined fee (of manufacture and set up). This fee for K kiosks is given by: F(k) = 150 + (k/2). The government expects that it will need 40,000 Kiosks in all. Should the government take the third-party company up on its offer?