6.828 FALL 2004, Quiz 2 Solutions
I Labs
Page 2 of 17
Ursula Unsafe is working on Lab 4, System Calls for Environment Creation. Here is her rst version of the
sys_mem_map system call:
/
/ Nap the page of memory at srcva in srcenvid/s address space
/ at ds
Calculating seasonality index and take out seasonality from Time Series Data i.e deseasonalize forecast
Forecast underlining trend. Then add seasonality back.
Calculate the average sales from sales data for 4 quarters
If we know 3 of the 4 indexes we can
In the spirit of the honor code as described in the syllabus, the work on this exam is mine alone.
I have not helped anyone or received any help from anyone during the exam.
1A1
Name: _
Please select the Best Answer.
1) Which of the following is an exampl
Quantitaive-mathematicaly focused,based on formula. Analysis of numbers found on balance sheet
Qualitative- visual display of important components of ecosystem. Simplification of complex system,
subjective judgement, management expertise, labor relation,
Heuristic Methods are not good when demand has trend over time
Regression-We have historical data and develop future prediction
Line can help us in forecasting future week values
Y=MX+B
M=Slope-rate of change of y as x changes
B=Intercept of line
Y interc
Video 1
Decision Analysis Part 1
When analyzing different decision alternatives there are three things in play
Decision Alternatives-What we can do
States of Nature-What can happen
Payoffs-What you get?
Decision making under Certainty-decision makers know
Topics to cover:
What is a Model?
Framework for development of Business Analytic models
1.1. Role of mathematical models in business decision making
1.1.1
What is Not true about models
a) Model is a representation of something
b) Model is an analogy
c) *M
Expected Value
You can think of an expected value as amean, oraverage, for aprobability distribution.
Suppose random variable x can take different values x1,x2.,xn with probability p1,p2,p3pn. Then Expected Value of experiment is given by
EV=x1*p1+x2*p2+x
6.857 Homework
April 11, 2014
Problem Set 2
# 2-1 Rainbow Tables
a) We can create a one-to-one table that maps cfw_0, 16 to a set of the alphanumeric symbols ([AZa-z0-9 -]). Given that table, we can map cfw_0, 160 to an element of S, we will call the mapp
Recall Digital Modulation for Wireless Link
Receiver Output
Baseband Input
it(t)
t
2cos(2f1t)
2sin(2f1t)
qt(t)
t
Lowpass
2cos(2f1t)
2sin(2f1t)
Lowpass
ir(t)
t
qr(t)
Decision
Boundaries
t
Sample
Times
Send discrete-leveled values on I and Q channels
Perfor
Frequency Synthesizer Noise in Wireless Systems
Zin
From Antenna
and Bandpass
Filter
PC board
trace
Zo
Package
Interface
RF in
Mixer
IF out
To Filter
LNA
LO signal
VCO
Reference
Frequency
Frequency
Synthesizer
Phase
Noise
fo
f
Synthesizer noise has a nega
6.828 FALL 2004, Quiz 1 Solutions
Page 2 of 13
I Virtual memory
1. [5 points]: The PDP-11 uses two bits in the Processor Status Word (PSW) to determine whether it
is currently running in kernel or user mode. Which bits in which register on the x86 determi
6.826Principles of Computer Systems
2002
6.826Principles of Computer Systems
2002
for practical purposes a task can lose the CPU at any point, since its too hard to predict which
memory references might cause page faults.
14. Practical Concurrency
We begi
6.826Principles of Computer Systems
2002
Any problem in computing can be solved by another level of indirection.
David Wheeler
Introduction
This handout is about orderly ways of naming complicated collections of objects in a computer
system. A basic techn
Recall Constant Envelope Modulation from Lecture 19
Baseband
Input
Baseband to RF Modulation
Power Amp
Transmit
Filter
Transmitter
Output
Constant-Envelope Modulation
Popular for cell phones and cordless phones due to
the reduced linearity requirements on
Amplitude Modulation (Transmitter)
Transmitter Output
0
x(t)
y(t)
2cos(2fot)
Vary the amplitude of a sine wave at carrier frequency fo
according to a baseband modulation signal
DC component of baseband modulation signal
influences transmit signal and rece
Outline
Closed-Loop Design of Frequency Synthesizers
- Introduction
- Background on Classical Open Loop Design Approach
- Closed Loop Design Approach
- Example and Verification
- Conclusion
Fast and Accurate Simulation of Frequency Synthesizers
- Introduc
MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Department of Electrical Engineering and Computer Science
6.012 MICROELECTRONIC DEVICES AND CIRCUITS
Answers to Exam 2 - Spring 2006
Problem 1: Graded by Prof. Fonstad
a) i)
A less than B, because K varies inversely w
Massachusetts Institute of Technology
Department of Electrical Engineering and Computer Science
6.111 - Introductory Digital Systems Laboratory
Problem Set 1 Solutions
Issued: Lecture 4 Day
Problem 1:
Not Graded.
Problem 2:
1.
f = (a + (b + c) (c + (a + b
Problem Set 2
Ben Bitdiddle, Alyssa P. Hacker
6.857
Problem 1 Rainbow Tables
April 11, 2014
(a) We desire a pseudorandom mapping from cfw_0, 1256 to S. First, we note that S is e ciently enumerable. In particular, S follows standard lexicographic order, w
1)
a)
library(MASS)
attach(Boston)
fit = lm(nox ~ poly(dis ,3, raw =T)
summary(fit)
# get the range of the axis we want the line to follow
ranges =range(dis)
# create a grid of x-axis points we want to predict. In order to smooth the make the increments s