Q22. In a computer network a virus is spreading from machine to machine. Each week, the proportion of uninfected computers that remain uninfected is 0.50 with the rest becoming infected. Meanwhile, 0.50 of the computers that are infected are restored and become uninfected with the rest remaining infected. Suppose 0.80 of the network is currently uninfected. A a В

Q22. In a computer network a virus is spreading from machine to machine. Each week, the proportion of uninfected computers that remain uninfected is 0.50 with the rest becoming infected. Meanwhile, 0.50 of the computers that are infected are restored and become uninfected with the rest remaining infected. Suppose 0.80 of the network is currently uninfected. A a В

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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b) i) If we lose 0 packets out of 10,000 arrivals to a queueing system in a simulation, what do we estimate to be the loss probability (LP), and the upper and lower confidence intervals at a 95% confidence? Use the Wilson Score interval. ii) What do Confidence Intervals tell us? iii) If we have 90% CI's and the first 8 experiments yield values within the CI's while the 9th experiment is outside, what do we predict about the result(s) of the 10th experiment? iv) If we didn't use Confidence Intervals what would be the effect on using simulation to study complex systems in engineering and computer science?
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Question 1: The English alphabet contains 21 consonants and five vowels. Determine the number of strings of eight lowercase letters of English alphabet contain at least one vowel? Determine the number of possible passwords with eight or ten characters long, where each character is an ASCII letter and there must be at least one @' in the passwords.
Suppose we have four machines that are using the Berkeley algorithm for clock synchronization. The time daemon is running on machine MO. The other machines are named M1, M2, and M3. The time readings on the four machines are as follows wenty-four hour clocks are usedt. MO 09:10 M1: 08:30 M2 10:10 M3: 07:14 In the third step of the algorithm, what are the values that the time daemon sends to each machine? Assume that the time values are expressed in minutes. Below, these values are presented in a vector value sent to MO, value sent to MI, value sent to M2. value sent to M3I none of these O84, 44, 96, 321 O(24, 16, -84, 92) O192. 84, 16. -24 O-32, 76, 40
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Blood Filter Problem: Suppose we have a dictionary of 2 million words and we wish to have a 0.015 probability of rejecting a password not in the dictionary. If we choose 5 hash functions, what will be the bytes required for the dictionary and what will be the compression ratio
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?
(c) A fully connected neural network is given below. ● x1 x2 1 Note that: i. ii. iii. iv. w11 w21 W31 w12 w22 w32 al a2 1 ReLU RELU h12 h21 h11 h22 h31 h32 The ReLU activation function is defined as follows: For an input x, ReLU(x) = max(0, x) The Softmax function is defined as follows: y1 s (x₂) y2 = Given the inputs, xi, i=1, ..., n; the outputs are as follows: exi Calculate the net inputs al and a2. Calculate the ReLU outputs. Calculate y1 and y2. Calculate z1 and 22. Softmax exj Suppose that the weights of the network are w11=-1.5; w12=-1.0, w21-1.2; w22=1.0; w31=-0.6; w32=1.0 h11=-0.5; h12=-1.0; h21=1.0, h22=1.5; h31= 0.4; h32=0.3 For an input of x1= 1.0 and x2=2.0 z1 z2
In a cellular network, each cell has seven channels, two of which are dedicated solely for handoff calls. Assume that both new and handoff call arrivals are subject to a Poisson process. The average arrival rate of new calls and handoff calls is 1.5 and 0.3 calls per minute, respectively. The holding duration of a channel is exponentially distributed, with a mean of 2 minutes. Determine the blocking probability of new and handoff calls.
Give an example of a circumstance when a user's total denial of a service—that is, the user receives no answer from the computer—is a serious issue. Describe a different scenario in which a 10% denial of service (i.e., the user's computation happens 10% slower than usual) causes significant issues. Is it feasible that unauthorised access to a computer system might prevent legitimate users from receiving 10% of their services? If that's true, how would you go about doing that?
Consider an ATM system that allows to: authenticate a user via a valid card and a valid PIN re-enter a PIN twice in case of incorrect PIN inquire balance withdrawn a valid amount of cash print a receipt transfer balance to other account Draw a transition system and enlist set of states S, set of actions A and set of transitions T.
Suppose Alice and Bob have RSA public keys in a file on a server. They communicate regularly, using authenticated, confidential message. Eve wants to read the messages but is unable to crack the RSA private keys of Alice and Bob. However, she is able to break into the server and alter the file containing Alice’s and Bob’s public keys. 1) How should Eve alter the file to so that she can read confidential messages sent between Alice and Bob, and forge messages from either? 2) How might Alice and/or Bob detect Eve’s subversion of the public keys?