Smart Space Applications Integration:A Mediation Formalism and Design for Smart-M3

Yury Korolev, St. Petersburg Electrotechnical University, Russia.Dmitry Korzun, Petrozavodsk State University, Russia.Ivan Galov Petrozavodsk State University, Russia.

The 5th conference on Internet of Things and Smart Spaces ruSMART 2012

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Agenda

• Ways of agents communication in the smart spaces.• Agents coordination mechanisms (the exchange of management information).

• Applications integration mechanisms (the exchange of computational information).

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IoT Architecture

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Smart-M3 Platform

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General Smart Space Platform

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Agents Communications CategoriesCommunication can be

• Point to Point – An agent talks directly to another agent.

• Broadcast– An agent sends some information to a group of

agents.• Mediated

– The communication between two agents is mediated by a third party.

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Whiteboard-based communications

• Making use of upper ontologies.• Agents interact indirectly through shared ontology.• Agents use the publish/subscribe mechanisms.

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Communication via mediator

• Problem of integration of applications processing multiple heterogeneous data sources.

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Integration of Smart Conference Systemwith blogging service

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Analogy with Qt signals and slots

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Analogy with Qt signals and slots 2

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The concept of mediation

),,( ρInS =

Meta Information. (For example, rules from an ontology or agents coordinations rules)

• Mediator is a kind of the context interpretator.• The interpretation is based on rules.

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What information should be passed?

Information can be:

• Managment– Events– Notifications

• Computational– Knowledge

Group control of the agents based on the interpretation of events.

Run time knowledge exchange.

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Rules for management information

(E1 ,E2 ,C )

CEE ,12 ←

Association rules can be constructed

automatically based on data mining techniques (Association rule learning).

- Association rule.

have_state(lighting, turn_off) :- left(?x, house), is(number_of_people_in_the_house,0).

– The owner left the house.– Turn off the lighting.– The house has no more people.

1E

2E

C

- Triggering event.

- Resulting event.

- Context.

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Problems

1. How to exchange heterogeneous computational information between the agents?

2. How to improve the performance of inference?

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Smart Space Applications Integration Definition

1. Smart space applications matching: process of establishing logical correspondences between elements of the source and target ontologies of integrated applications. As a result of this process integration scenarios are formed.

2. Run time instance mapping: process of mapping the instances, processed by integrated applications.

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Smart Space Applications matching

The expert must determine:

1. The events that initiate the process of integration;(<application_ID>,<notification_name>,<data_id>);

2. Input data for integration;SELECT *WHERE { ?person foaf:name ?name . ?person foaf:mbox ?email .}

3. Mapping rules to transform entities of the source smart space to entities of target smart space.'title'(postId, titleValue) :- 'Title'(presentationID, titleValue), generateUID(postId).

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Run time instance mapping

Ss is a source smart space; N is a data loading notification; P is a set of graph queries to the source smart space;T is a set of transformation mapping rules for the source and target smart spaces;St is a target smart space.

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Mediator specification

- source and target ontologies.

- notifications.

- source queries (one per notification).

- target queries (one per notification).

- source to target dependencies.

- a set of transformation rules (one per notification).

( )TDQPNOO ,,,,,, 21=µ

21 ,OO

{ }inN = { }ipP =

{ }idD = { }iqQ =

{ }itT =

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Integration of hierarchical information

• Need to establish a logical correspondence between integrable entities. • Or need to keep the history of integration.

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Integration of hierarchical information 2

• Need to establish a logical correspondence between integrable entities. • Or need to keep the history of integration.

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Transformation mapping rules types for computational information

• Production rules;• UIDs (URIs) generation;• Manipulations with

• numbers;• strings;• date and time;

• Integration of hierarchical information.

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Manipulations with strings

text = create_string('Speaker is %s (email: %s; phone: %s;).Presentation is available at: %s', is, email, phone, url);

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Mediator Architecture

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Mediator Activity Diagram

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The mediator has a decentralized nature

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Thank you for your attention