University of Mumbai 2009 M.Sc Information Technology M Sc Mobile Computing Advanced Networks - Question Paper

M Sc Mobile Computing Advanced Networks

Con. 1630-09.

nnppiL 200

CR-5784 [Total Marks : 75

but not more than three questions from any

(1) Attempt any five questions section

(2)    Answers to the two sections must be written in separate answer books and should be submitted separately.

(3)    Write answers to same question together.

(4)    Each question carries 15 marks.

   Section I

Explain what are the problems encountered during propagation of signals in 05

cod. division multiplexing help in ion of 05

information over wireless networks? State its advantages and

Expfainlhe reasons why baseband signal eannot be direetly transmitted in 05 wireless systems.

OR

What is roaming? List and explain the steps for roaming between access points.

Write a shoet note on:

i. Exposed terminals

ii Tele services in GSM networks.    _ _    , .

Whai are foreign and home agents? Explain the repstrat.on of a kobile 04

node via the foreign agent with the home agent.

06 04

State the characteristics and system arctitecture of a ECT network. What are ad-hoc networks? State their advantages and disadvantages.

Write short note on mobile terminated calls.

OR

Write a short note on MACand Location management

What is DHCP? Explain the process of client initialization via DHC .

State advantages and disadvantages of HAWAII.

the ggcncral problems of Mobile IP regarding security and 04

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requirements? Explain.

Write short note on : j. WAP

ii. Reservation TDMA

OR

How and why does I-TCP isolate problems on the wireless link? What are

the main drawbacks of this solution?    .

What problems of HTTP can WSP solve? Why are these solution

esDecially needed in wireless mobile environments.

What is broadcasting? Explain inbrief digial audio broadcasting.

Explain the situations where LAN switch is prefer instead of routers. List the steps involved in Network Designing.

OR

Discuss the advantages and disadvantages of SONET.

Write note on ESCON (Enterprise System Connection) Architecture.

Discuss the benefits of Frame Relay over Private Line Networks. Compare Open and Closed Loop architectures.

OR

Write note on Link Access Protocol, Balanced (LAPB)

Explain the various possible causes of delay m the network.

Write note on Switched MultiMegabit Data Service (^SMDS)-Discuss the technical requirements and strategies that should e consider before designing the network.

^OR    * A

Describe the situations where the following technologies are preferred

i. IP Service ii. Public Data Service

iii. X.2S Service iv. Private Line

What is TCP? Give the TCP frame format and TCP/IP functions.

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N.B (1) Attempt any five questions but not more than three questions from any section

(2)    Answers to the two sections must be written in separate answer books and should be submitted separately.

(3)    Write answers to sa me question together

(4)    Each question carries 15 marks

Section I

Q1 a) What do you mean by strategic information (SI)? Discuss why there is need for 8 strategic information. Explain any four characteristics of SI

b) How are datawarehouse projects different from OLTP projects? Describe    7

any six differences

OR

Q2 a) What is information package.cxplam in short.explain hierarchies & business 7 metrics with at least four examples b) Write a short note on dimension table & fact table    8

Q3 a) Bad data leads to bad decision.comment. Discuss the data pollution sources

b) Write a short note on slowly changing dimensions

OR

Q4 a) Explain drill-down-&roll up and slice-&-dice b) Write a short note on KDD process robot.

State different types of clustering methods & explain K means clustering

Define neural network. Discuss the advantages & disadvantages of

OR

Write a short note on spatial mining.

Define data mining & explain any four applications of data mining in short. Section II

John Records has decided to store information about musicians who perform on its albums (as well as other company data) in a database. The company has wisely chosen to hire you as a database designer. Each musician that records at John has an Registration No., a name, an address, and a phone number. Poorly paid musicians often share the same address, and no address has more: than onejPh^ne-Each Instrument used in songs recorded at John has a unique identification number a name (e.g., guitar, synthesizer,, flute] and a musical key (e_g C B-flat,E_flat) Each album recorded on the John has a title, a copyright date, a format (e.g., CD or MC) and an album identifier. Each song recorded at John has a title and an author. Each musician may play several instruments, and a given instrument may be played by several musicians Each album has a number of songs on it, but no song may appear on more than one album. Each song is performed by one or more musicians, and a musician may perform a number of songs. Each album has exactly one musician who acts as Its producer. A musician may produce several albums. Draw an ER diagram for the schema.

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39.    ¹

(3 Hours)    [^{Total Marks : 75}

(1)    Attempt any five questions but not more tlian three questions from any section

(2)    Answers to the two scclions must be written in separate answer books and should be submitted separately.

(3)    Write answers to same question together

(4)    Each question carries IS marks

Scction I

A Explain zooming and shrinking in brief.    ⁷

B Write a short note on brightness adaptation & discrimination.    8

OR

A Discuss the connectivity of pixels,

B What is Fourier Transform? Apply 2 D Fourier Transform on the following S image.

6	8	10	8
6	10	8	4
10	8	6	5
4	4	8	8

A Write a short note on Gray level Slicing & bit plane slicing technique used in ⁷ image enhancement technique.

B Explain the basic steps for filtering in the frequency domain    8

OR

A Write a short note on Histogram matching.    '

B Apply spatial filtering using tow pass filter mask to the following image. Also 8 apply median filter. Apply the mask on 1lie center pixel only. Compare the results of both the filters.

1	1	1	1	1
10	10	10	10	10
1	1	1	I	1
10	10	10	10	10
1	1	1	I	1

A Define Image compression. Apply Huffman code for the following.

Ai	0.2
A2	0.4
A3	0.1
A4	0.1
A5	0.1
A6	0.1

B Write a short note on Lossless predictive model used in image compression 8

OR

A Define thresholding. Explain global thresholding algorithm    ⁷

B Define representation. Explain thinning algorithm used in representation    8

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general classification of phonemes m Englh 5

What are phonemes ? Give the ( language.

; of LPC model in speech recognition. Write the the matrix form presentation of auto

Explain in brief the importance <

T PC analysis equation and give correlation function & predictor coefficient. [Derivation of the matrix form ,

not expected]

What does the following LPC parameter represents N , M .P ,Q & K

Draw the diagram of complete bank of filer analysis model Describe .he 7

effect of every block on spcech signal.

Explain the importance of speech endpoint detection. Lis. the reasons for the 8 detection? Explain in biicf.

Describe vector quantized based speech recognition system

b)

OH a)    What is state transition matrix in HMM?

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what are .he different problem needs to be resolved m order to -e le connected word recognition problem.

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bword    units    that    can    be    used    to    model    speech?

recognition error.

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Computar simuAjxtion a⁵ rtocK\in$- cr-5727

profjrommiV0 (₃ffi)^C0    [Total Marks : 75

(1)    Attempt any five questions but not more than three questions from any section

(2)    Answers to the two sections must be written in separate answer books and should be submitted separately.

(3)    Write answers to same question together

(4)    Each question carries 15 marks

Suction I

a)    Describe the areas in which simulation can be applied    ⁷

b)    A bank's ATM centre has only one ATM machine operating. Customers arrive at S this centre at random from 1 to 10 minutes. The probabilities of arrival disliibution and service distribution are listed as below. Develop the simulation table for 10

Time between arrivals	1	2	3	4	5	6	7	8	9	10
Probability	0.10	0.05	0.12	0.10	0.13 | 0.12		0.16	0.10	0.10	0.02

Service Time	1	2	3	4	5	6
Probability	0.05	0.10	0.20	0.30	0.25	0.10

Determine the average waiting time for a customer as well as the probability of a customer to wait in the queue.

Use the following random numbers

Random numbers for arrivals : 25, 31, 15, 88, 64, 12, 73, 36,45 Random numbers for Service : 10, 22,34, 16, 59, 74, 48, 37, 51, 18

(OR)

a)    Explain the major conccpts in discretc-cvcnt simulation    7

b)    i) For an exponentially distributed random variable X, find the value o:: X that 8 satisfies the following relationship:

P(X < 3) = 0.9 P (X < 4)

ii) The time to service customers at a bank teller's counter is exponentially distributed with a mean of 50 seconds. What is the probability that the two customers in front of an arriving customer will each take less than 60 seconds to complete their transactions?

a)    How to evaluate and select simulation software?    ⁷

b)    Find the probability that 6 < X < 8 for each of the following distributions:    8

i)    Uniform

ii)    Normal

iii)    Triangular

iv)    Exponential

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a)    Describe the inverse transformation teclmique for exponential distribution    7

b)    The sequence of numbers 0.54, 0.73, 0.98, 0.11 and 0.68 has been generated. Use 8 Kolmogorov-Smimov test with a = 0.05 to determine if the hypothesis that the numbers are uniformly distributed on the interval [0,1] can be rejected. ( The critical value Da is 0.565).

Q5 a) Define and state the steps in acceptance-rejection technique

b) Develop a random variate generator for a random variable whose pdf is 1/3, 0<x<2 1/24, 2 < x < 10 0, otherwise

(OR)

be followed in verification of simulation models?

Q6 a) What suggestions and steps can b) Describe simple linear regression

SECTION II

Q7 a) Explain the concept of distributed and web object system in detail?

b) What is bean component? Explain the architecture of enterprise java beans?

Q8 a) What is Interface Definition Language? And show how methods are used in IDL? b) Explain the different situations under which AddRef and Release Method is called?

Q9 a) What is apartment? Explain the different threading model supported by it?

b) Explain the examples for implementing the COM interface pointers in java and Visual Basic.

b) Explain the functions of

a)    CoInitializeEx and CoUnlnitialize .

b)    IOleltemContainer and IClassFactory

Qll a) Explain the need of dynamic decomposition in COM?

b) Explain the following services with an example: Event Service, Externalization Persistent Object and Licensing.

(OR)

Q12 a) Explain the In-process and out-process server with an example?

b) How do abstract based classes function as binary interfaces?

Attachment: university-of-mumbai-2009-m-sc-information-technology-51648-1.pdf

Earning:   Approval pending.