Current Attempt in Progress The Blue Parrot is an expensive restaurant in midtown open only for dinner. Entrees are set at a fixed price of $42. In a typical month the restaurant will serve 3,600 entrees. Monthly variable costs are $61,200, and fixed costs are $31,000 per month. Customers or waiters send back 8% of the entrees because of a defect, and they must be prepared again; they cannot be reworked. The restaurant owners hired a qualified Black Belt to undertake a Six Sigma project at the restaurant to eliminate all defects in the preparation of the entrees (i.e., 3.4 DPMO). Compare the profit in both situations, with and without defects, and indicate both the percentage decrease in variable costs and the percentage increase in profits following the Six Sigma project. Assuming that the restaurant paid the Black Belt $25,000 to achieve zero defects, and the restaurant owners plan to amortize this payment over a 3-year period (as a fixed cost), what is the restaurant return on its investment (without applying an interest rate)? (Round answer to 0 decimal places, e.g. 15%) Return on investment e Textbook and Media Save for Later Attempts: unlimited Submit Answer

Current Attempt in Progress The Blue Parrot is an expensive restaurant in midtown open only for dinner. Entrees are set at a fixed price of $42. In a typical month the restaurant will serve 3,600 entrees. Monthly variable costs are $61,200, and fixed costs are $31,000 per month. Customers or waiters send back 8% of the entrees because of a defect, and they must be prepared again; they cannot be reworked. The restaurant owners hired a qualified Black Belt to undertake a Six Sigma project at the restaurant to eliminate all defects in the preparation of the entrees (i.e., 3.4 DPMO). Compare the profit in both situations, with and without defects, and indicate both the percentage decrease in variable costs and the percentage increase in profits following the Six Sigma project. Assuming that the restaurant paid the Black Belt $25,000 to achieve zero defects, and the restaurant owners plan to amortize this payment over a 3-year period (as a fixed cost), what is the restaurant return on its investment (without applying an interest rate)? (Round answer to 0 decimal places, e.g. 15%) Return on investment e Textbook and Media Save for Later Attempts: unlimited Submit Answer

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Give an example of a time when a user's complete denial of a service (when the user gets no response from the computer) caused them a big problem. Another example of how a 10% denial of service is a big problem for a user is given. In this case, the user's calculations move forward, but at a rate that is 10% slower than usual. Illegal access to a computer system could cause 10% of the legitimate users of that computer system to not be able to use it. If so, what steps would you take?
Consider the following snapshot of a system: Allocation Max Available A B C D A B C D A B C D T0 3 1 4 1 6 4 7 3 2 2 2 4T1 2 1 0 2 4 2 3 2T2 2 4 1 3 2 5 3 3T3 4 1 1 0 6 3 3 2T4 2 2 2 1 5 6 7 5 Answer the following questions using the banker’s algorithm: Illustrate that the system is in a safe state by demonstrating anorder in which the threads may complete. If a request from thread T4 arrives for (2, 2, 2, 4), can the request begranted immediately? If a request from thread T2 arrives for (0, 1, 1, 0), can the request begranted immediately? If a request from thread T3 arrives for (2, 2, 1, 2), can the request begranted immediately? Given six memory partitions of 100 MB, 170 MB, 40 MB, 205 MB, 300 MB, and 185 MB…
There are many sensors on a wind turbine, based on each sensor's reading many alerts are generated as (start, end). For easier monitoring, our customer is asking to raise alerts on the turbine level instead of on each sensor. If any sensor is having an alert, there should be an alert for the entire wind turbine. Suppose the alerts created with two sensors readings are [(0,3),(5,10),(1,4),(10,15)], then the turbine level alert should be [(0,4),(5,15)]. Return the alerts sorted by the start timestamp. If there is no alert from the sensor level, return an empty array []. Code needs to be in Python?
Consider the following snapshot of a system: Allocation Max Available A B C D A B C D A B C DT0 3 1 4 1 6 4 7 3 2 2 2 4T1 2 1 0 2 4 2 3 2T2 2 4 1 3 2 5 3 3T3 4 1 1 0 6 3 3 2T4 2 2 2 1 5 6 7 5Answer the following questions using the banker’s algorithm:a. Illustrate that the system is in a safe state by demonstrating anorder in which the threads may complete.b. If a request from thread T4 arrives for (2, 2, 2, 4), can the request begranted immediately?c. If a request from thread T2 arrives for (0, 1, 1, 0), can the request begranted immediately?d. If a request from thread T3 arrives for (2, 2, 1, 2), can the request begranted immediately?
Write a python mapper and reducer script that would calculate the number of rating records provided each year-month. b)Can you generalise your Hadoop streaming job so that we are given the option through a parameter at run time, to choose whether the number of rating records should be calculated for each year-month or for each day-of-the-week? Provide the amended Python scripts as well as the Hadoop streaming commands and explain the programming logic. (looking for the answer of question b)
Santa Claus is working to upgrade his list from a handwritten one to a more modern, digital solution. As youlikely already know, he must keep track of each child, their naughty/nice status, their location, position on hisroute, the toys they asked for, the elves assigned to make those toys, the elves’ working schdule, their favoritepayment methods, and keep track of their production as the year progresses, to make sure nobody will be leftout this Christmas. Keep in mind, he also needs a way to check his list twice. The following bulleted listreiterates what we’ve already discussed as requirements.• Children, their naughty/nice status (two of these for checking the list twice), location, route position (i.e.what order their presents are delivered in), requested toys.• List of elves, production assignments (which toys for which children), preferred payment methods (candy,candy-canes, candy corn, syrup), their work schdedules (assume 3, 8 hour shifts).• List of presents, whether or not…
Consider the following snapshot of a system: ALLOCATION MAX AVAILABLE A B C D A B C D A B C D P0 3 2 1 4 3 4 2 7 4 4 3 1 P1 2 5 4 3 4 7 7 6 P2 3 1 1 2 5 3 2 3 P3 2 4 2 3 2 5 3 5 P4 4 2 3 2 6 3 6 3 Answer the following questions using the banker’s algorithm: Illustrate that the system is in a safe state by demonstrating an order in which the processes may complete. If a request from process P4 arrives for (2,2,1,1), can the request be granted immediately? If a request from process P1 arrives for (1,1,3,1), can the request be granted immediately?
You are placing an order with an online retailer. To complete a purchase, your web browser sends a single encrypted, MAC-authenticated message to the web site, consisting only of the following information: a) your credit card information, b) the item number and quantity being ordered. a. Write a formula using the function symbol MAC(…) to indicate what is being authenticated. You may choose any reasonable variable names for the data items. b. Say an adversary is sitting between you and the retailer, with the ability to intercept traffic and send messages. Assume the authentication is not vulnerable to length extension. Describe a cryptographic attack the adversary could carry out to “max out” your credit card. What type of attack is this? c. What could the retailer do to prevent this attack, simply by changing what data is sent in that single encrypted, authenticated message? Write a new MAC() formula to show the new construction.
Describe a situation in which a user's complete denial of a service (i.e., the user gets no response from the computer) is a significant problem. Describe another case in which a 10% denial of service (i.e., the user's calculation proceeds at a 10% slower pace than normal) is a major problem. Is it possible that unauthorised access to a computer system will result in a ten percent service denial for legitimate users? How would you go about accomplishing that if that's the case?
Let's consider a system where for security parametern, running for109∗n3clock cycles can break an encryption scheme with probability16∗n10∗2−n. Ifn=64, this probability is 1 (magic!) for109∗n3=109∗643clock cycles, requiring a running timeTof about three days on a1Ghzcomputer. Now a more powerful8Ghzcomputer becomes available. Butnis also doubled to 128 in the encryption scheme as well. Using the same running timeTas before on the new computer, what is the probability for this system to break this current encryption scheme? Please clearly show how you arrive at the conclusion. (Hint: First find out how much computation can be done in the given time on the new computer. Then you can see how that relates to the success probability.). Please type answer no write by hend.
An early attempt to force users to use less predictable passwords involved computer supplied passwords. The passwords were eight characters long and were taken from the character set consisting of lowercase letters and digits. They were generated by a pseudo-random number generator with 2^15 possible starting values. Using the technology of the time, the time required to search through all character strings of length 8 from a 36-character alphabet was 112 years. Unfortunately, this is not a true reflection of the actual security of the system. Explain the problem
Suppose you have two columns, [Text1] and [Text2], in a MS Access table, how do you enforcethat only one of them can have a value?A) Apply the validation rule to either [Text1] or [Text2] column: ([Text1]="" And [text2]<>"") Or ([Text1]<>""And [text2]="" B) Apply the validation rule to either [Text1] or [Text2] column: ([Text1]="" And [text2]!="") Or ([Text1]!=""And [text2]="" C) Apply the validation rule to the table: [Text1] or [Text2] column: ([Text1]="" And [text2]!="") Or([Text1]!="" And [text2]="" D) Apply the validation rule to the table: ([Text1]="" And [text2]<>"") Or ([Text1]<>"" And [text2]="" E) none of the above