Running case assignment: understanding information system requirements

software skills: presentation software

business skills: management analysis and information system recommendations

how do you know what information systems are really needed by a business and which are the most important? how should a company’s structure or culture affect the building and use of information systems?

dirt bikes’s management has asked you to prepare a management analysis of the company to it assess the firm’s current situation and future plans. review dirt bikes’s company history, organization chart, products and services, and sales and marketing in the introduction to dirt bikes.
then prepare a report that addresses these questions:

• what are the company’s goals and culture?
• what products and services does dirt bikes u. s.a. provide? how many types of products and services are available to customers? how does dirt bikes sell its products?
• how many employees are managers, production workers, or knowledge or information workers? are there levels of management?
• what kinds of information systems and technologies would be the most important for a company such as dirt bikes?
• (optional) use electronic presentation software to summarize for management your analysis of dirt bikes’s performance.

Consider a slotted aloha system, where the time slot equals the fixed duration of each packet. assume that there are 4 stations a,b,c,d sharing the medium. (a) stations a,b,c,d receive one packet each from higher layers at times 1.3, 1.5, 2.6,5.7 respectively. show which transmissions take place when, according to the slottedaloha protocol; describe all transmissions until all four packets have been successful.when needed, each station has access to the following sequence of random number, provided by a random number generator and drawn uniformly between 0 and 1: (1) station a draws numbers: 0.31, 0.27, 0.78, 0.9, 0.9, 0.11, 0. (2) station b draws numbers: 0.45, 0.28, 0.11, 0.83, 0.37, 0.22, 0. (3)station c draws numbers: 0.1, 0.2, 0.3, 0.4, 0. (4) station d draws numbers: 0.36, 0.77, 0.9, 0.1, 0.1, 0.1, 0.1, 0. (b) in slotted aloha, a station transmits in each time slot with a given probability. what probabilities would you assign to each of the four stations so as to: (i) maximize the efficiency of the protocol? (ii) maximize fairness among the four stations? (c) will the efficiency increase or decrease if we modify slotted aloha as follows: (i) get rid of slots and allow stations to transmit immediately? (ii) implement carrier sensing? (iii) implement collision detection? (iv) implement collision avoidance?