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DBGlobe IST-2001-32645
Evaggelia Pitoura, UoI, Greece
1st Year Review, Cyprus, January 31, 2003
Proactive initiative on Global Computing (GC)
Future and Emerging Technologies (FET)
The roots of innovation
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Outline

• General Introduction
• Dissemination and Self-Assessment
• Individual Presentations (per WP)
• Future Directions for Next Year

DBGlobe, 1st Annual Review
Paphos, Jan 2003
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DBGlobe Introduction
DBGlobe, 1st Annual Review
Paphos, Jan 2003
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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?
On the premise, global computing is a database
problem how to design, build and analyze
systems that manage large amount of data
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
The traditional database approach of storing data
of interest in monolithic database management
systems becomes obsolete
DBGlobe, 1st Annual Review
Paphos, Jan 30, 2003
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Why DBGlobe?

• In GC, autonomous computational entities, not
  centrally controlled activity thus massive
  distribution, heterogeneity, autonomy
• In traditional db research, centralized or small
  scale distribution/relatively homogeneous, full
  control
• In GC, mobile computational entities
• In traditional db research, passive data and data
  sources, in that they remain unchanged unless
  explicitly updated
• In GC, the configuration varies over time
• In traditional db research, static (their
  location remains fixed).
• In GC, systems operate with incomplete
  information about the environment
• In traditional db research, exact knowledge as
  opposed to discovery, filtering

New research problems in all aspects of data
management modeling, dissemination, storage, and
querying
Paphos, Jan 2003
DBGlobe, 1st Annual Review
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Overview
The DBGlobe project aims at developing novel data
management techniques to deal with the challenge
of global computing
Partners Univ. of Ioannina, GR
(coordinator) INRIA, FR CTI, GR AUEB, GR Univ. of
Cyprus, CY Univ. of California at Riverside,
USA Subcontractors, Technical University of
Crete, GR Aalborg University, DK
Paphos, Jan 2003
DBGlobe, 1st Annual Review
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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
DBGlobe, 1st Annual Review
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Timeline
Year 1
Year 2
WP6 Management
WP5 Proof-of-Concept Prototype
WP4 Information Discovery and Querying
WP3 Data Delivery Coordination
WP2 Simulation
WP1 System Architecture
15 18 21 24
3 6 9 12
DBGlobe, 1st Annual Review
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A quick look
Overview per Work Package .. More on the
results in the talks that will follow
DBGlobe, 1st Annual Review
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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.

Paphos, Jan 2003
DBGlobe, 1st Annual Review
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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

DBGlobe, 1st Annual Review
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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)
PMO
PMO
PMO

• Data-centric
• PMOs 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
DBGlobe, 1st Annual Review
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WP1 System Architecture
Service-Oriented Approach
Data encapsulated within services Why
services interoperability respect autonomy
of PMOs can be composed distributed
execution security
Users interact with the system through AXML
queries, Active XML incorporates calls to
services and XQuery (XML query language)
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WP1 System Architecture
AXML Query
Ontologies/Metadata/Semantic Context
Semantic Layer
Infrastructure context (device metadata, location
mangement) Indexes/replication/caching
System Layer
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WP1 System Architecture

• 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)

DBGlobe, 1st Annual Review
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Service Creation and Discovery
WP1 System Architecture

• 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

DBGlobe, 1st Annual Review
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Profile Data - User Profile
WP1 System Architecture

• 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 PMO
• The characteristics of the device itself,
• e.g., screen size, memory, keyboard, processor
  power
• 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
WP1 System Architecture

• 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)

DBGlobe, 1st Annual Review
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WP2 Simulator
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

DBGlobe, 1st Annual Review
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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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Publications (WP1 and WP2)

• 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
• 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.demokrit
  os.gr/lobster/lobster_mykonos2002.html

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Publications (WP1)
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
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The DBGlobe Project WP3
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.

DBGlobe, 1st Annual Review
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The DBGlobe Project WP3
Outcomes of WP3 so far
D8 Data Delivery Mechanisms A taxonomy of
mechanisms An outline of potential use within the
DBGlobe architecture

• A number of specific results in data delivery
• Coherent Push-based Data Delivery
• Adaptive Multi-version Broadcast Data Delivery
• Efficient Publish-Subscribe Data Delivery

DBGlobe, 1st Annual Review
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The DBGlobe Project WP3
Taxonomy of Different Modes of Data Delivery
push
Publish/subscribe (aperiodic, 1-N, push)
Email list ( aperiodic, unicast, push)
pull
Polling ( periodic, unicast, pull)
1-N
broadcast
unicast
periodic
aperiodic
Request/Response (aperiodic, unicast, pull)
DBGlobe, 1st Annual Review
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The DBGlobe Project WP3
The Data Broadcast Push Model

• 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

Broadcast Channel
Server
Client

• 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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The DBGlobe Project WP3
Coherent Data Delivery
Ensure that clients receive temporally coherent
(e.g., current) and semantically coherent
(transaction-wise) data

• Provide a model for temporal and semantic
  coherency
• Show what type of coherency we get if there are
  no additional protocols
• Show what type of coherency is achieved by a
  number of protocols proposed in the literature
  (and their extensions)

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The DBGlobe Project WP3
Adaptive Multi-Version Broadcast

• 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

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The DBGlobe Project WP3
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
The DBGlobe Project WP3

• 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
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Contributions
The DBGlobe Project WP3

• 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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Publications (WP3)
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.
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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.

DBGlobe IST-2001-32645
Paphos, Jan 2003
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AXML Documents
The DBGlobe Project WP4

• 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.

• ltknownAuctions ID"peer10"gt
• ltcategory name"Toys"gt
• ltscgteBay.net/getOffers("Toys")lt/scgt
• ltauction id"1254" gt
• ltheldBygteBay.netlt/heldBygt
• ltitemgtPink pantherlt/itemgt
• lt/auctiongt
• ltscgtbabel.org/translate("Czech",
  "English",
• ltscgtcrystal.cz/getToys()lt/scgt)lt/scgt
• ltscgtpeer25/getAuctions(../_at_name)lt/scgt
• lt/categorygt
• ...
• ltsc frequency"once" gtgetMyAuctions()lt/scgt
• lt/knownAuctionsgt

Are enriched by each service call's results The
returned nodes are inserted as brothers of the
corresponding ltscgt element.
Can use XPath expressions for call
parameters Relative path expressions are
evaluated starting from the ltscgt 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
The DBGlobe Project WP4

• 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 computation
• location-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
  site
• An algorithm
• Security and capabilities
• Based on types

DBGlobe IST-2001-32645
Paphos, Jan 2003
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The DBGlobe Project WP4
Publications (WP4)
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
DBGlobe IST-2001-32645
Paphos, Jan 2003
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Work Outline (WP5)
implement a proof-of-concept prototype location-a
ware queries
DBGlobe, 1st Annual Review
Paphos, Jan 2003
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The DBGlobe Project WP5
Initial Results
Exploitation of Materialized Views (implemented
through mobile agents) for supporting
CoAS Initial implementation of context-aware
portals for wireless users
DBGlobe, 1st Annual Review
Paphos, Jan 2003
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Publications (WP5)
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
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Management Deliverables Meetings Budget
DBGlobe, 1st Annual Review
Paphos, Jan 2003
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Technical Deliverables Year 1
DBGlobe, 1st Annual Review
Paphos, Jan 2003
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Technical Deliverables Year 2
DBGlobe, 1st Annual Review
Paphos, Jan 2003
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General Deliverables (WP6) Year 1
DBGlobe, 1st Annual Review
Paphos, Jan 2003
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General Deliverables (WP6) Year 2
DBGlobe, 1st Annual Review
Paphos, Jan 2003
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Meetings
Three Project Meetings in 2002 Kick-off
meeting, Jan 11, Athens 2nd Meeting, May 27-28,
Ioannina 3rd Meeting, Nov 29, Athens
presentations at the web page A number of
Working Groups Meetings AUEB UoI,
Ioannina AUEB CTI, Athens
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Effort
 

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Dissemination Publications Web Page Events
DBGlobe, 1st Annual Review
Paphos, Jan 2003
49
Publications (WP1 and WP2)
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.demokrit
os.gr/lobster/lobster_mykonos2002.html
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Publications (WP1)
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
51
Publications (WP3)
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.
52
Publications (WP4)
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.
53
Publications (WP1, WP5)
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.
54
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

Dissemination Activities (INRIA)
Keynote talk at WISE 2002 Summer School
Presentation, EDBT 2002 Industry Seminars Project
presentation, Air_at_home NoE Proposal Demo, VLDB
2002, Hong Kong, August 2002
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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

Dissemination Activities (AUEB)
Paper presentation, Lobster Workshop, Mykonos,
Greece, October 2002
Dissemination Activities (UCY)
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
Dissemination Activities (UCR)
Project presentation, ICDE, March 2002
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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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DBGlobe IST-2001-32645