Future and Emerging Technologies (FET)

Future and Emerging Technologies (FET)

Future and Emerging Technologies (FET)

The roots of innovationThe roots of innovationThe roots of innovationThe roots of innovation

Proactive initiative on:

Global Computing (GC)

Proactive initiative on:

Global Computing (GC)

DBGlobe IST-2001-32645

1st Year Review,

Cyprus, January 31, 2003

Evaggelia Pitoura, UoI, Greece

2

1. General Introduction

2. Dissemination and Self-Assessment

3. Individual Presentations (per WP)

4. Future Directions for Next Year

Outline

DBGlobe, 1st Annual Review Paphos, Jan 2003

DBGlobe: Introduction


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The Vision of Global Computing:

In the near future, there will be increasingly powerful computers in smart cards, telephones, and other information appliances. Smart buildings will put computers in light switches, vending machines, and home appliances. Software objects, in the form of mobile software agents, will roam the Internet.

This will create a massive infrastructure composed of highly diverse interconnected mobile entities.

GC INITIATIVE: The ultimate goal of the research action is to provide a solid scientific foundation for the design of such systems, and to lay the groundwork for achieving effective principles for building and analysing such systems.

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Why DBGlobe?

A Data-Centric Approach:

autonomous mobile entities handle (possess, produce, need, use) data

data (metadata) describe the entities

Our focus:

How to store, index, disseminate, discover, query data in global computing

Paphos, Jan 30, 2003DBGlobe, 1st Annual Review

On the premise, global computing is a database problem: how to design, build and analyze systems that manage large amount of data

The traditional database approach of storing data of interest in monolithic database management systems becomes obsolete

6DBGlobe, 1st Annual Review

Paphos, Jan 2003

In GC, autonomous computational entities, not centrally controlled activity thus massive distribution, heterogeneity, & autonomyIn traditional db research, centralized or small scale distribution/relatively homogeneous, full control

In GC, mobile computational entitiesIn traditional db research, passive data and data sources, in that they remain unchanged unless explicitly updated

In GC, the configuration varies over timeIn traditional db research, static (their location remains fixed).

In GC, systems operate with incomplete information about the environmentIn traditional db research, exact knowledge as opposed to discovery, filtering

New research problems in all aspects of data management: modeling, dissemination, storage, and querying

Why DBGlobe?

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The DBGlobe project aims at developing novel data management techniques to deal with the challenge of global computing

Overview

Partners:

Univ. of Ioannina, GR (coordinator)INRIA, FRCTI, GRAUEB, GRUniv. of Cyprus, CYUniv. of California at Riverside, USA

Subcontractors,Technical University of Crete, GRAalborg University, DK


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A quick look …

Work divided in 6 Work Packages (WP)

WP1: System Architecture

(main system components, metadata, distribution)

WP3: Data Delivery and Coordination

(means to delivery data, how to coordinate execution)

WP4: Querying and Information Discovery

(how to discover data, how to query)

WP2: Simulation Environment

(provide an environment for simulation work)

WP5: Proof-of-Concept

(build a prototype context-aware applications)

WP6: Project Management


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Timeline …


Year 1 Year 2

3 6 9 12


15 18 21 24

WP2: Simulation

WP3: Data Delivery & Coordination

WP4: Information Discovery and Querying

WP5: Proof-of-Concept Prototype

WP6: Management

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A quick look …

Overview per Work Package ..

More on the results in the talks that will follow …


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Data centric Approach

• mobile entities as primary data stores,

• mobile entities as mini-servers (computational entities) that protect and encapsulate access to their data

ad-hoc distributed database systems of unprecedented scale

Meta-information and services:

•Storage Components that hold metadata about mobile objects

•Server Components that provide services for and about the mobile objects.

a backbone of metadata information and services to reason about and query the behaviour and state of the autonomous mobile entities.


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System Architecture (WP1)


Objectives

• Specification of the requirements of the system

• Metadata definition

• Determining of policies for replicating, caching and aggregating data and metadata across the network sites of the system

• Overall System Design

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System Architecture (WP1)


System Architectures: No centralized database server, instead, each mobile object constitutes a database of each own.

PMOs (Primary Mobile Objects)

DBGlobe

iMacPMOPMO

PMO

Data-centricPMOs as primary data stores

PMOs as computational entities that protect and encapsulate access to their data

Communities: clustering of data and services based on “context”, e.g., location

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Service-Oriented Approach

Data encapsulated within services

Why services:interoperabilityrespect autonomy of PMOscan be composed distributed executionsecurity


Users interact with the system through AXML queries, Active XML incorporates calls to services and XQuery (XML query language)

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Semantic Layer

System Layer

AXML Query

Ontologies/Metadata/Semantic Context

Infrastructure context (device metadata, location mangement)

Indexes/replication/caching


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DBGlobe architecture

– Infrastructure• PMOs are organized according to spatial proximity into

cells• Cell Administration Servers (CAS) manage sets of cells

and the PMOs located within them

– Middleware• Community Administration Servers (CoAS): semantic

grouping of PMOs and associated data and services according to context

• User Agents represent the user (PMO) (for example, in case of network disconnections)



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Service Creation and Discovery

Composition of Services and Semantic Service Matching

– Parameter ontology covering all the parameters used in the various services

– Service ontology supports the structuring of services and aids service discovery



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Profile Data - User Profile

Users have preferences with respect to what information they usually request, and considering mobility, as to when and to where


Profile Data - Device Profile

Data that characterizes the PMO1. The characteristics of the device itself,

e.g., screen size, memory, keyboard, processor power 2. The characteristics of the device with respect to the DBGlobe

system e.g., credentials, after registering with the DBGlobe network, a

schedule for the availability of data

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Profiles - Movement

• User and device profiles contain spatiotemporal data about moving objects

• Definition of a mobile ontology to record – the trajectory (movement)– properties of the trajectory (e.g., speed, heading)– relationships among trajectories (e.g., meet,

intersect)– relationships with environment (e.g., cross)



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Simulation Environment (WP2)

Objective

Build a simulator for such dynamic environments and use it to test our protocols

Current Status

Our current simulator supports the basic functionality of CAS

Networking, mobility management, service registration and invocation


WP2: Simulator

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The DBGlobe Project: WP1 & WP2

Summary

Distribution of “infrastructure components” (CAS) based on geographical proximity

Distribution of “middleware” components (CoAS) based on context proximity

Analysis of metadata (service and parameter ontology, mobile ontology, profile and content metadata)

Bloom-based summaries of indexes for distributed service discovery

Initial results on content caching

Replication of services (more later on AXML)

Working simulator that provides basic system support and proof-of-concept implementation work on specific aspects

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1. A. Karakasidis and E. Pitoura, “DBGlobe: A Data-Centric Approach to Global Computing”. International Workshop on Smart Appliances and Wearable Computing (IWSAWC 2002). In conjunction with ICDCS 2002, Vienna, Austria, July 2002

2. D. Pfoser, E. Pitoura, and N. Tryfona. “Metadata Modeling in a Global Computing Environment”. Proc. of the 10th ACM International Symposium on Advances in Geographic Information Systems, McLean, VA November 8-9, 2002.

3. S. Valavanis, M. Vazirgianis, and K. Norvag, “MobiShare: Sharing Context-Dependent Data and Services from Mobile Sources”. Submitted for publication

4. C. Ververidis, S. Valavanis, M. Vazirgiannis, G.C. Polyzos, “An Architecture for Sharing, Discovering and Accessing Mobile Data and Services: Location and Mobility Issues”, Presented at: Lobster Workshop, LBS for accelerating the European-wide deployment of Services for the Mobile User and worker, Mykonos, Greece, 4-5 October, 2002, http://www.iit.demokritos.gr/lobster/lobster_mykonos2002.html

Publications (WP1 and WP2)

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6. P. Triantafillou and I. Aekaterinides, “Web Proxy Cache Replacement: Do's, Don'ts and Expectations”. Submitted for Publication

7. P. Triantafillou and I. Aekaterinides, “Web Proxy Cache Placement, Replacement and the Proxy Teller”, Submitted for Publication

8. G. Koloniari and E. Pitoura, “Bloom-based Filters for Hierarchical Data”, Submitted for Publication

9. G. Kastidou, E. Pitoura and G. Samaras, “A Scalable Mobile Agent Location Mechanism”, Accepted for Publication 1st International Workshop on Mobile Distributed Computing (MDC'03), May 19, 2003, held in conjunction with the 23rd International Conference on Distributed Computing Systems (ICDCS'03), To appear 2003.

A paper on the overall DBGlobe architecture, by all partners, in preparation

Publications (WP1)

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Work Outline (WP3)

Data Delivery/Coordination

Data delivery among the system components: (a) the mobile entities, (b) the servers and (c) the users. Derive adaptive data delivery mechanisms that will combine various mode of delivery such as

push (transmission of data without an explicit request) and pull, periodic and aperiodic , as well as multicast and unicast delivery.

Model the coordination of the mobile entities using workflow management and transaction management techniques that have been used in the multi-agent community.


The DBGlobe Project: WP3

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A number of specific results in data delivery:

• Coherent Push-based Data Delivery

• Adaptive Multi-version Broadcast Data Delivery

• Efficient Publish-Subscribe Data Delivery

D8: Data Delivery Mechanisms

A taxonomy of mechanisms

An outline of potential use within the DBGlobe architecture

Outcomes of WP3 so far:The DBGlobe Project: WP3

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Taxonomy of Different Modes of Data Delivery

pull

unicast broadcast

periodic

aperiodic

push

Email list( aperiodic, unicast, push)

Publish/subscribe(aperiodic, 1-N, push)

1-N

Polling( periodic, unicast, pull)

Request/Response(aperiodic, unicast, pull)


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The Data Broadcast Push Model

Client

Server Broadcast Channel

• The server broadcasts data from a database to a large number of clients

• push mode + no direct communication with the server (stateless server, e.g., sensors)

“client-side” protocols

• Data updates at the server

• Periodic updates for the values on the channel

Efficient way to disseminate information to large client populations with similar interests Physical support in wireless networks (satellite, cellular) Various other applications, sensor networks, data streams


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Ensure that clients receive temporally coherent (e.g., current) and semantically coherent (transaction-wise) data

Coherent Data Delivery

1. Provide a model for temporal and semantic coherency

2. Show what type of coherency we get if there are no additional protocols

3. Show what type of coherency is achieved by a number of protocols proposed in the literature (and their extensions)


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The server (data source) at each cycle sends not just one value per item but instead multiple versions per item

Explore multiple versions for increasing client concurrency and disconnections: develop protocols and evaluate their performance

Access multiple server states at the same time: access to data series when not enough memory

or

Multiple data servers share the channel (multi-sensors networks), that is multiplexing data from a number of sensors

Adaptive Multi-Version Broadcast


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Issues

How should the broadcast be organized?

select the order according to which items are broadcast

What are appropriate client-cache protocols?

We have developed

broadcast organizations and

client cache replacement policies that adapt to the client access behaviour

We have proposed data compression schemes


DBGlobe, 1st Annual Report Paphos, Jan 2003

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Subscription Framework in DBGlobe

• Personalized Information Delivery: Pub/Sub Systems– Subscriptions of services– Events: service calls– Match: events to all subscriptions impacted

Key problems when designing and implementing large-scale publish/subscribe systems efficient propagation of subscriptions and distributed event processing among the servers of the system


DBGlobe, 1st Annual Report Paphos, Jan 2003

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Contributions

• Motivation: Develop data structures and algorithms that can introduce significantly more efficient – subscription propagation, – event processing, and – event matching/filtering.

• Key idea: Summarize subscriptions and …process summaries as opposed to subscriptions.


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E. Pitoura and P. Chrysanthis. “Multiversion Data Broadcast”, IEEE Transactions on Computers, 51(10):1224-1230, October, 2002

E. Pitoura, P. K. Chrysanthis and K. Ramamritham. “Characterizing the Temporal and Semantic Coherency of Broadcast-based Data Dissemination”. Proc. of the 9th International Conference on Database Theory, January 2003, Siena, Italy.

O. Shigiltchoff, P. Chrysanthis and E. Pitoura. “Multi-version Data Broadcast Organizations”. In Proc. of the 6th East European Conference on Advances in Databases and Information Systems (ADBIS), September 2002, Bratislava, Slovakia

P. Triantafillou and A. Economides, “Subscription Summaries for Scalability and Efficiency in Publish/Subscribe Systems”, 1st Intl. IEEE Workshop on Distributed Event-based Systems, (DEBS02) July 2002.

P. Triantafillou and A. Economides, “Efficient Distributed Event Processing using Subscription Summaries in Large Scale Publish/Subscribe System”, Submitted for Publication.

Publications (WP3)

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Work Outline (WP4)

Querying: Data exchange and computation in the background in response to cues or queries from users. On a multitude of databases (networked mobile processing entities and their data)

New query language modelling abstractions that will:

include a knowledge acquisition component, no exact knowledge of the data schema, information may be incomplete. High update rate (of both data values and context information)

incorporate filtering,

Be context-aware, to deal with the scale and complexity of the environment.

Query execution models for such dynamic environments of numerous processing entities.

Paphos, Jan 2003

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AXML Documents

<knownAuctions ID="peer10"> <category name="Toys"> <sc>eBay.net/getOffers("Toys")</sc> <auction id="1254" > <heldBy>eBay.net</heldBy> <item>Pink panther</item> </auction> … <sc>babel.org/translate("Czech",

"English", <sc>crystal.cz/getToys()</sc>)</sc>

<sc>peer25/getAuctions([../@name])</sc>

</category> ... <sc frequency="once"

>getMyAuctions()</sc> …</knownAuctions>

May contain calls to any SOAP web service• e-bay.net, google.com, babel.org, etc.• AXML peers also offer web services.• Locally defined services can be called.

Are enriched by each service call's resultsThe returned nodes are inserted as brothers of the corresponding <sc> element.

Can use XPath expressions for call parametersRelative path expressions are evaluated starting from the <sc> element.

Activation of calls and data lifespan are controlled• frequency: when is the service called ?• validity: how long is the retrieved data kept ?• mode: immediate or lazy ?

AXML Documents are powerful data integrators.


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Outline

• Distribution and replication– distribute the load among devices, by:

• Using several services • Distributing documents across several devices.

– replicate documents and services, to allow for “local” computationlocation-aware extension of XQuery to handle distributed/replicated data

and services.A cost model for the global computing context, measuring the

“observable performance” of each siteAn algorithm

• Security and capabilities

Based on types


DBGlobe IST-2001-32645 Paphos, Jan 2003

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S. Abiteboul, O. Benjelloun, I. Manolescu, T. Milo and R. Weber, “Active XML: Peer-to-Peer Data and Web Services Integration (demo)”, Proceedings of the 28th VLDB Conference, Hong Kong, 2002.

T. Milo, S. Abiteboul, B. Amman, O. Benjelloun, F. Dang and Ngoc, “Exchanging Intentional XML Data”, SIGMOD 2003

S. Abiteboul, A. Bonifati, G. Cobena, I. Manolescu and T. Milo, “Dynamic XML Documents with Distribution and Replication”, SIGMOD 2003

Publications (WP4)

DBGlobe IST-2001-32645 Paphos, Jan 2003


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Work Outline (WP5)

implement a proof-of-concept prototype

location-aware queries


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Initial Results

Exploitation of Materialized Views (implemented through mobile agents) for supporting CoAS

Initial implementation of context-aware portals forwireless users



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C. Panayiotou, G. Samaras, “Personalized Portals for the Wireless User Based on Mobile Agents: Demonstration“, Accepted for Publication, 19th International Conference on Data Engineering, Sponsored by the IEEE Computer Society, March 5 - March 8, 2003 - Bangalore, India. To appear 2003.

G. Samaras, C. Panayiotou, "A Flexible Personalization Architecture for Wireless Internet Based on Mobile Agents", Proc. 6th East-European Conference on Advances in Databases and Information Systems (ADBIS 2002), September 2002, Bratislava, Slovakia.

G. Samaras, C. Spyrou, E. Pitoura, “View Generator (VG): A Mobile Agent Based System for the Creation and Maintenance of Web Views”, 7th IEEE Symposium on Computers and Communications, Taormina, Italy July 2002.

G. Samaras, K. Karenos, P. K. Chrysanthis and E. Pitoura. “ViSMA: Implementation of an Extendible Mobile-Agent Based System for the Materialization and Maintenance of Personalized and Shareable Web Views” (Demo). Submitted for publication

Publications (WP5)

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Management

DeliverablesMeetings

Budget


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Technical Deliverables: Year 1

July 2002

D2: Metadata Management (WP1)

CTI

Sept 2002

D3: Overall System Architecture (WP1)

CTI

Oct 2002 D8: Data Delivery Mechanisms (WP3)

UoI

Dec 2002

D6: Initial Simulator Prototype and Web page (WP2)

AUEB


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Technical Deliverables: Year 2

Apr 2003 D9: Modeling Coordination Through Workflows (WP3)

UoI

Jun 2003 D7: Final Simulator Prototype and Web page (WP2)

AUEB

Jun 2003 D11: The Query Language of DBGlobe (WP4) INRIA

Jun 2003 D12: Query Optimization and Execution in DBGlobe(WP4)

INRIA

Aug 2003 D10: Data Delivery and Querying (WP3) UoI

Aug 2003 D14: Location Aware Ad-Hoc Databases and Query Processing (WP5)

UCY

Nov 2003 D13: Information Discovery and Querying (WP5) INRIA

Nov 2003 D15: Prototype System for Location Aware Querying(WP5)

UCY


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General Deliverables (WP6): Year 1

Feb 2002 D1: Consortium Agreement

Internal distribution

Mar 2002 D4.1: Project Presentation Brief presentation of the project(posted in EC websites, reports)

Jun 2002 D18.1 Parameters and criteria for Self Assessment

Set criteria based on which the project will be evaluated

Jun 2002 D5: Dissemination and Use Plan

Plan for the dissemination of knowledge, exploitation plan

Dec 2002

D18.2 Self Assessment Report

Evaluation of the results based on D18.1

Dec 2002

D16.1 Dissemination Results

Report on the dissemination activities during the first year

Dec 2002

D4.2: Progress Report


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General Deliverables (WP6): Year 2

Jun 2003 D16.2: Dissemination Results

Dec 2003 D18.3 Self Assessment Report

Dec 2003 D16.3 Dissemination Results and Technological Implementation Plan

Dec 2003

D4.3: Progress ReportD17: Final Report

For the final project review


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Three Project Meetings in 2002

Kick-off meeting, Jan 11, Athens2nd Meeting, May 27-28, Ioannina3rd Meeting, Nov 29, Athens

presentations at the web page

A number of Working Groups Meetings

AUEB – UoI, IoanninaAUEB – CTI, Athens

Meetings

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Effort

Workpackage No and Title Lead Partner

Persons-months per participant for the first year

UOI INRIA CTI AUEB UCY UCR


CTI 7.0

8.0 11.0 - 1.0 4.0

WP2: Simulation Environment

AUEB 4.0 - 1.0 7.78 3.0 1.0

WP3: Data Delivery and Coordination

UoI 8.025 2.0 - 4.35 2.0 1.0

WP4: Information Discovery and Querying

INRIA 1.0 9.0 - 1.98 1.5 -

WP5: Proof-of-concept Prototype: Location-Aware Querying

UCY 1.0 - - 1.0 2.5 -

WP6: Project Management and Dissemination of Results

UoI 6.0 - - - - -

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Dissemination

PublicationsWeb Page

Events


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A. Karakasidis and E. Pitoura, “DBGlobe: A Data-Centric Approach to Global Computing”. International Workshop on Smart Appliances and Wearable Computing (IWSAWC 2002). In conjunction with ICDCS 2002, Vienna, Austria, July 2002

S. Valavanis, M. Vazirgianis, and K. Norvag, “ MobiShare: Sharing Context-Dependent Data and Services from Mobile Sources”. Submitted for publication

C. Ververidis, S. Valavanis, M. Vazirgiannis, G.C. Polyzos, “An Architecture for Sharing, Discovering and Accessing Mobile Data and Services: Location and Mobility Issues”, Presented at: Lobster Workshop, LBS for accelerating the European-wide deployment of Services for the Mobile User and worker, Mykonos, Greece, 4-5 October, 2002, http://www.iit.demokritos.gr/lobster/lobster_mykonos2002.html

Publications (WP1 and WP2)

50

P. Triantafillou and I. Aekaterinides, “Web Proxy Cache Replacement: Do's, Don'ts and Expectations”. Submitted for Publication

P. Triantafillou and I. Aekaterinides, “Web Proxy Cache Placement, Replacement and the Proxy Teller”, Submitted for Publication

D. Pfoser, E. Pitoura, and N. Tryfona. “Metadata Modeling in a Global Computing Environment”. Proc. of the 10th ACM International Symposium on Advances in Geographic Information Systems, McLean, VA November 8-9, 2002.

A paper on the overall DBGlobe architecture, all partners, in preparation

Publications (WP1)

51

E. Pitoura, P. K. Chrysanthis and K. Ramamritham. “Characterizing the Temporal and Semantic Coherency of Broadcast-based Data Dissemination”. Proc. of the 9th International Conference on Database Theory, January 2003, Siena, Italy.

O. Shigiltchoff, P. Chrysanthis and E. Pitoura. “Multi-version Data Broadcast Organizations”. In Proc. of the 6th East European Conference on Advances in Databases and Information Systems (ADBIS), September 2002, Bratislava, Sloavakia

E. Pitoura and P. Chrysanthis. “Multiversion Data Broadcast”, IEEE Transactions on Computers, 51(10):1224-1230, October, 2002

P. Triantafillou and A. Economides, “Subscription Summaries for Scalability and Efficiency in Publish/Subscribe Systems”, 1st Intl. IEEE Workshop on Distributed Event-based Systems, (DEBS02) July 2002.

P. Triantafillou and A. Economides, “Efficient Distributed Event Processing using Subscription Summaries in Large Scale Publish/Subscribe System”, Submitted for Publication.

Publications (WP3)

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S. Abiteboul, O. Benjelloun, I. Manolescu, T. Milo and R. Weber, “Active XML: Peer-to-Peer Data and Web Services Integration (demo)”, Proceedings of the 28th VLDB Conference, Hong Kong, 2002.

T. Milo, S. Abiteboul, B. Amman, O. Benjelloun, F. Dang and Ngoc, “Exchanging Intentional XML Data”, SIGMOD 2003

S. Abiteboul, A. Bonifati, G. Cobena, I. Manolescu and T. Milo, “Dynamic XML Documents with Distribution and Replication”, SIGMOD 2003

G. Koloniari and E. Pitoura, “Bloom-based Filters for Hierarchical Data”, Submitted for Publication

G. Kastidou, E. Pitoura and G. Samaras, “A Scalable Mobile Agent Location Mechanism”, Accepted for Publication 1st International Workshop on Mobile Distributed Computing (MDC'03), May 19, 2003, held in conjunction with the 23rd International Conference on Distributed Computing Systems (ICDCS'03), To appear 2003.

Publications (WP4)

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G. Samaras, C. Panayiotou, "A Flexible Personalization Architecture for Wireless Internet Based on Mobile Agents", Proc. 6th East-European Conference on Advances in Databases and Information Systems (ADBIS 2002), September 2002, Bratislava, Slovakia.

G. Samaras, C. Spyrou, E. Pitoura, “View Generator (VG): A Mobile Agent Based System for the Creation and Maintenance of Web Views”, 7th IEEE Symposium on Computers and Communications, Taormina, Italy July 2002.

G. Samaras, K. Karenos, P. K. Chrysanthis and E. Pitoura. “ViSMA: Implementation of an Extendible Mobile-Agent Based System for the Materialization and Maintenance of Personalized and Shareable Web Views” (Demo). Submitted for publication

C. Panayiotou, G. Samaras, “Personalized Portals for the Wireless User Based on Mobile Agents: Demonstration“, Accepted for Publication, 19th International Conference on Data Engineering, Sponsored by the IEEE Computer Society, March 5 - March 8, 2003 - Bangalore, India. To appear 2003.

Publications (WP1, WP5)

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Dissemination Activities (UoI)Presentation of the project at the IFIP WG 2.6 meeting, Lausanne,

Switzerland, May 15-17, 2002

Paper presentation, ICDCS Workshop, Vienna, July 2002

Paper presentation at ICDT, Siena, Italy, Jan 2003

Panel presentation, HDMS02, Athens Greece, July 2002

Keynote talk at WISE 2002

Summer School Presentation, EDBT 2002

Industry Seminars

Project presentation, Air@home NoE Proposal

Demo, VLDB 2002, Hong Kong, August 2002

Dissemination Activities (INRIA)

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Dissemination Activities (CTI)Informal meeting, University of Salzburg, Austria

IST-FET CODMINE project meeting, Athens

Paper presentation, ACM GIS 2002 conference, McLean, USA

Paper presentation, Lobster Workshop, Mykonos, Greece, October 2002

Panel presentation, SAINT02, Naras, Japan, Jan/Feb 2002

Project presentation, MB-net Workshop, Athens, Greece, June 2002

Paper presentation, ISCC 2002, Taormina, Italy, July 2002

Project presentation, ICDE, March 2002

Dissemination Activities (AUEB)

Dissemination Activities (UCY)

Dissemination Activities (UCR)

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WEB Page

www.softsys.cs.uoi.gr/dbglobe

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Conclusions

After the first year, we are converging nicely to a unified approach …

Architecture: derived a model for managing data in global computing:

service-oriented

relies on semantic information

provides for “Community” support

distribution and indexing of service descriptions, services and data

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Conclusions

Data Delivery: propose a model for coherency, protocols for adaptive push and efficient publish/subscribe

Querying: Replication and Distribution of Services and Documents/Security

Simulation Environment

Many publications submitted and many accepted (among others in SIGMOD, ICDT, Trans. on Computers, ICDE (demo), VLDB (demo), ACM GIS )

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Future and Emerging Technologies (FET)

Documents

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