InformationBaseQoI hasQuality Context AppDomainCntx name: string description: URL standardName:...
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Informati on BaseQoI hasQuality Context AppDomainCntx name: string description: URL standardName: string standardDescription: URL QoISpatialCntxAt tr name: string lowerBound: QoIMetric upperBound: QoIMetric QoITemporalCntxAt tr name: string lowerBound: int upperBound: int QoIBaseAttr name: string QoIQualif ier QoI attributes A 1 1 The base QoI metadata model Annual Conference of ITA Annual Conference of ITA ACITA 2009 ACITA 2009 Building Principles for a Quality of Information Specification for Sensor-originated Information The end-to-end information flow App_i needs information items: α, β, γ, and δ; it receives: α’, γ’, and δ’ Networks of data sources Networks of fusion, processing and intermediary decision centers CommNets ? Networks of end-users α β γ δ δ‘ γ' α' app_i • On-demand, just-in-time deployment of sensor- enabled applications requires creation of elaborate sensor-based services with on-the- fly, dynamic binding capabilities to available data/sensor and communication resources • QoI can play central role in indexing/searching these sensor-based services QoI for sensor information • The world comprises objects and linkages between these objects • The “world state vector” (wsv) describes the world as a function of time • Elements of the wsv are inferred using data sources • Information is the estimated value wsv elements x 1 ={ location, velocity, type, allegiance} x 2 ={ location, velocity, type, allegiance} information gathering information processing information distribution information: estimate of object state(s) x QoI: collection of information attributes: accuracy, latency, provenance information delivery x 3 ={ location, direction, strength, allegiance} QoI? sensor nodes Information + Metadata Information’ + Metadata’ Information’ + Metadata’ Information + QoI Metadata Information Annotation Operator Information Modifier Operator Information + Metadata Fusion Operator Information + Metadata Information + Metadata Information + QoI Metadata Information + QoI Metadata QoI Annotator VoI Annotator • Informatio n flows and processed during its end-to-end journey derived metadata (mtd(y m )) ; derived info(y n ) metadata (mtd(x m )) info (x m ) Object processor local or remote repositories where metadata may be retrieved from or stored to for future use … … … … m incoming data objects n outgoing data objects metadata (mtd(x)) info (x) An information object metadata (mtd(x 1 )) info (x 1 ) derived metadata (mtd(y 1 )) derived info (y 1 ) Information operators • Shooter localization through a collection of acoustic sensor arrays • The information product produced comprises the “shooter state: – Shooter location – Direction of shooting LocationAppQoIInteg rity owner: String sensorModel: String sensorPower: String LocationAppQoIAccur acy snr: real range: real temporalResolution: real LocationAppInformation shooterPosition: Coordinate shooterDirection: Coordinate reportTime: double QoIAccuracyAttr QoIIntegrityAttr Information DOA algorithm (s) TDOA algorithm (s) localizat ion algorithm (s) spectra location time shooter location (bearing) shooter location (bearing & range) shooter location (Cartesian co-ordinates) A shooter localization example QoI is… • Mixture of inherent and context-dependent properties of quality complicates progress • Quality vs. Value of Information • Quality of Information (QoI) – The body of evidence (described by information quality attributes) used to make judgments about the fitness (or, utility) of information • Value of information (VoI) – The utility of the information when used in a specific application context VoI QoI “holistic” view of QoI “separable” view of QoI assessment in app-context inherent quality attributes VoI VoI App_1 App_2 App_N • Has been studied within the context of data collected and maintained by large industrial and governmental information technology systems – Quality attributes: Consistency, syntactic/semantic accuracy, timeliness/currency/volatility Chatschik Bisdikian Lance M. Kaplan Mani B. Srivastava David J. Thornley Dinesh Verma Robert I. Young IBM Research, US ARL, US UCLA, US Imperial College, UK IBM Research, US Dstl, UK
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Transcript of InformationBaseQoI hasQuality Context AppDomainCntx name: string description: URL standardName:...
Information BaseQoIhasQuality
ContextAppDomainCntx
name: stringdescription: URLstandardName: stringstandardDescription: URL
QoISpatialCntxAttrname: stringlowerBound: QoIMetricupperBound: QoIMetric
QoITemporalCntxAttrname: stringlowerBound: intupperBound: int
QoIBaseAttrname: string
QoIQualifier
QoI attributesQoI attributes A
1 1
The base QoI metadata model
Annual Conference of ITAAnnual Conference of ITAACITA 2009ACITA 2009
Building Principles for a Quality of Information Specification for Sensor-originated Information
The end-to-end information flow
App_i needs information items: α, β, γ, and δ; it receives: α’, γ’, and δ’
App_i needs information items: α, β, γ, and δ; it receives: α’, γ’, and δ’
Networks of data sources
Networks of fusion, processing and intermediary decision centers
CommNets
?
Networks of end-users
α β γ δ
δ‘γ'α'
app_i
• On-demand, just-in-time deployment of sensor-enabled applications requires creation of elaborate sensor-based services with on-the-fly, dynamic binding capabilities to available data/sensor and communication resources
• QoI can play central role in indexing/searching these sensor-based services
QoI for sensor information
• The world comprises objects and linkages between these objects
• The “world state vector” (wsv) describes the world as a function of time
• Elements of the wsv are inferred using data sources
• Information is the estimated value wsv elements
x1={ location, velocity, type, allegiance}
x2={ location, velocity, type, allegiance}
information gathering
information processing
information distribution
information: estimate of object state(s) xQoI: collection of information attributes:
accuracy, latency, provenance
information: estimate of object state(s) xQoI: collection of information attributes:
accuracy, latency, provenance
information delivery
x3={ location, direction, strength, allegiance}
QoI?
sensor nodes
Information + Metadata
Information’ + Metadata’
Information’ + Metadata’
Information + QoI MetadataInformation
AnnotationOperator
Information
Modifier Operator
Information + Metadata
Fusion Operator
Information + Metadata
Information + Metadata
Information + QoI Metadata
Information + QoI Metadata
QoI Annotator
VoI Annotator
• Information flows and processed during its end-to-end journey
derivedmetadata(mtd(ym))
;;
derivedinfo(yn)
metadata(mtd(xm))
info (xm)
Object processorObject
processor
local or remote repositories where metadata maybe retrieved from or stored to for future use
local or remote repositories where metadata maybe retrieved from or stored to for future use
… …
… …
m incomingdata objects
n outgoingdata objects
metadata(mtd(x))
info (x)
An information objectAn information object
metadata(mtd(x1))
info (x1)derived
metadata(mtd(y1))
derivedinfo (y1)
Information operators
• Shooter localization through a collection of acoustic sensor arrays
• The information product produced comprises the “shooter state:– Shooter location– Direction of shooting
LocationAppQoIIntegrityowner: StringsensorModel: StringsensorPower: String
LocationAppQoIAccuracysnr: realrange: realtemporalResolution: real
LocationAppInformationshooterPosition: CoordinateshooterDirection: CoordinatereportTime: double
QoIAccuracyAttr QoIIntegrityAttrInformation
DOAalgorithm(s)
TDOAalgorithm(s)
localizationalgorithm(s)
spectra
location
time
shooter location(bearing)
shooter location(bearing & range)
shooter location(Cartesian co-ordinates)
A shooter localization example
QoI is…
• Mixture of inherent and context-dependent properties of quality complicates progress
• Quality vs. Value of Information
• Quality of Information (QoI)– The body of evidence (described by
information quality attributes) used to make judgments about the fitness (or, utility) of information
• Value of information (VoI) – The utility of the information when
used in a specific application context
VoIVoI
QoIQoI
“holistic” view of QoI“holistic” view of QoI
“separable” view of QoI“separable” view of QoI
assessment inapp-context
inherent qualityattributes
VoIVoIVoIVoIApp_1
App_2 App_N
• Has been studied within the context of data collected and maintained by large industrial and governmental information technology systems– Quality attributes: Consistency, syntactic/semantic accuracy, timeliness/currency/volatility
Chatschik Bisdikian Lance M. Kaplan Mani B. Srivastava David J. Thornley Dinesh Verma Robert I. YoungIBM Research, US ARL, US UCLA, US Imperial College, UK IBM Research, US Dstl, UK
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