mm_distributed application.pptx

8/14/2019 MM_Distributed application.pptx

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DISTRIBUTED APPLICATION

DESIGN ISSUES

P


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ISSUES Need to consider design issues?

Areas of considerations:

Areas ofconcern

NetworkingCommunication

Infrastructure

Cachingrequirements

CompressionDecompression

Requirements

Distributedworkflows


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Areas ofconcern

Networking

Communication

Infrastructure

Caching

requirements

Compression

DecompressionRequirements

Distributed

workflows


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LOCATION INDEPENDENCE

Application can run on any node and maintain the same workflow patternlocations of servers/workstations

Use logical addressing instead of referring an object by its physical locatio

Achieved by creating an abstraction layer in addressing of

objects and encapsulating knowledge of lower layers

Ensures the same sequence of operations for a business

process irrespective of users location in network


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NETWORK PROTOCOL AND

COMMUNICATION FUNCTION

Workstation/servers on different LAN communicate with each other

Need to define standards for:

Network Layer InterfacesEnsures common network interface for apdevices with different operating software

ProtocolsDefines the standard form and contents of the message exbetween nodes

Communication FunctionSpecifies the nature of communication betworkstation and servers


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NETWORK INDEPENDENCE

LAN may be configured on different requirements and may have different ne

IEEE standards/Token-ring/ATM/FDDI

Twisted pair/co-axial/fiber optic cables

Applications should be able to freely move data across multiple media types

Design the system to ensure workflow integrity

Single view of LAN/WAN network to ensure flexibility


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Areas ofconcern

Networking

CommunicationInfrastructure

Caching

requirements


Requirements

Distributed

workflows


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STORAGE AND CACHE

CONSIDERATION A cache provides an immediate staging area allowing faster prefetching and

Multitier cache storage should be used for multimedia objects

Why?

Storage available on fast magnetic disk much smaller than that on optic

Objects reside in the cache as long as they are needed, for longer durat

Network performance is maintained

Scaling and Format Translation are not known until client workstation ca


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Cache may be stored centrally at a cache server

Cache can also be stored at one of the following locations depending on th

organization of the network:

Scan capture nodeQC or scan capture cache

Application database nodegeneral image cache

Fileserverworkstation image cache


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Areas ofconcern

NetworkingCommunication

Infrastructure

Caching

requirements

Compression

Decompression

Requirements

Distributed

workflows

COMPRESSION INTEGRATED


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COMPRESSION INTEGRATED

WORKFLOW

Whycompression?

User convenience and faster transmission

Hardware capacity of different components in a network

Compression can be performed by hardware providing the input(Scanner/special compression software

Compression may be performed at 3 different stagesaccording to the requi

On the fly as the object is scanned or captured

As a separate pass before or after indexing/Quality checks

By a separate compression server

DECOMPRESSION INTEGRATE


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DECOMPRESSION INTEGRATE

WORKFLOW Whydecompression?

Display

Printing Facsimile transmission of multimedia objects

Compression can be performed by hardware providing the output(Printer/Mby special compression software

Decompression may be performed at 3 different stagesaccording to the req

At the workstation

At the multimedia object server

At a dedicated decompression server that may also provide format tran


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Areas ofconcern

Networking

CommunicationInfrastructure

Cachingrequirements


Requirements

Distributed

workflows

WORKFLOW INTEGRATION O


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WORKFLOW INTEGRATION O

INDEXING Whyindex?

Index is much smaller in size as compared to data object

Speeds the search for the data objects

It provides random access pointer to the data object

E.g: Object ID can be embedded in hypermedia documents to quickly re

Following are the type of indexing methods:

Object Identification Indexing

Content Based Indexing

Voice and Picture synchronization indexing

Annotation


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CONTENT BASED INDEXING


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CONTENT BASED INDEXING

Used in audio/videocassette tapes for indexing of voice/audio/video based med

It allows user to mark section of interest by placing MARKERS

Why?

Quicker access the section of interest for display

Possible to clip out section of audio sequence for merging into a new seque

Faster playback of audio/video is possible

Markers can be stored in the same multimedia object or in a separate reference


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SYNCHRONIZATION

Used in indexing of full motion video

Similar in concept to audio indexing but is more complex

Complex?

Sound and video components stored separately

Sound and voice input use different controller (Analog sound with digital vid

Sound and video components may require different decompression algorithm

Advantage: Strategically placed indexing can assist in resynchronizing sound with

playback

ANNOTATION


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ANNOTATION Definition: They are comments or footnotes defined to clarify a thought or an id

Annotations

Document ImageAnnotations

Text Annotations

ImageAnnotations

Annotations forsound and video

Text Annotations


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Text Annotations

Simple

Can be added/edited/printed with or without the original image

depending on design of workflow

Image Annotations

They are scanned image segments of the annotated text

Image Annotations can be added/cropped/printed but the content of

remaining section of annotations cannot be edited

Annotations for Sound and video

E.g marketing director after reviewing recorded video clip may record a

set of comments to the field sales force

Require index markers to indicate the exact location in the sound or

video object where they should be viewed


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THANK YOU

mm_distributed application.pptx

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