DESIGN AND IMPLEMENTATION OF AN ONTOLOGY FOR MODELING USERS PROFILE IN PERVASIVE COMPUTING

APPLICATIONS

• EFSTATHOPOULOS AGGELOS-SERAFEIM REG. NUMBER 649

• PROFESSOR: GOUMOPOULOS CHRISTOSSEPTEMBER 19 2013 PATRAS

TECHNOLOGICAL EDUCATIONAL INSTITUTE OF PATRAS

SCHOOL OF MANAGEMENT AND ECONOMICS

DEPARTMENT OF BUSINESS PLANNING AND INFORMATION SYSTEMS

THESIS

Pervasive Computing

• Envisioned by Mark Weiser.• Evolution of mobile computing .• Integration of microprocessors in environmental objects.• Ubiquitous systems with the use and interconnection of

wired and wireless networks and sensors(for example internet).

• Rapid development due to the popularity of laptops smartphones ,laptops, tablets .

Characteristics of pervasive systems

• Invisibility. Ideally the complete disappearance of the system by the user . The system serves the user without being distracting .

• Development capability. Users increase, technologies (internet bandwidth, processors ) are improving, the system must be developed accordingly.

• Customize evenly in various environments of varying complexity , organization and intelligence - needs ( eg offices, factories )

• Context awareness. Knowledge of features, user needs and the surrounding environment (eg name , surname, residence , daily habits and contacts ) .

Pervasive Computing Technologies

• It is one or more computer programs that are moving freely in a system (mobile agent platform) performing missions by the system or user.

• Decentralizes the classic client -server systems , balancing the workload .

• Just for this is ideal for pervasive systems.Mobile security agent• System security agent for threats coming from another agent or

from the system or outside of it.Mobile agent platforms• Various platforms with different uses, like Grasshopper, Alma beans

, Aglets(java based), Pervasive Information Community Organization (PICO) and others.

1. Mobile agent

2. Sensor Networks

• Development and implementation of smart environmental data detection devices in an area ( from a house up to space)

• Extremely useful in pervasive systems , which are also called nodes • Cheap, low processing power , send data (eg temperature ,

pressure) wired or wirelessly to more powerfull base station for processing.

• Applications for monitoring data on the battlefield , in seismic surveys, dangerous for fire forests , public works (bridges ) , hospitals, habitats , etc.

Software sensor network systems• They are programming dynamic sensor nodes using virtual

machines and mobile agents .• There are several , such as Mate, SensorWare, Deluge, Agilla etc.

3. Applications

1. Pervasive volcano monitoring system

OASIS•OnSite temperature , pressure and vibration monitoring with wireless sensors of St. Helens volcano.•Cooperation with GPS and ground based Sensorweb software of Jet Propulsion Laboratory (JPL) and satellite Earth Observer-1.

2. Pervasive personalized higher education platform

• Adjusts the content of the courses to the needs , interests and student's background.Uses the Mobile agent system PICO.

• Agents are self- organized exchanging data and helping the system to create the student degree program.

Ontologies

Ontology is a formal, explicit specification of a common devise .•First mention by Plato, Parmenides , Aristotle.•Optical visualizing of the system operation .

Categories byi.Expression ( highly / partially Informal, partially / strict Standard ) ii.Technical Modeling with (1st class Logic, Descriptive Logic eg OWL, UML software and OCL language, ER Database diagrams).iii.Knowledge use(Workplace, Target ontologies, Area ontologies, Generic ontologies).iv.Internal structure(Simple Vocabularies, Glossaries , Thesauri , Informal / Formal hierarchies , Frames , Limiting value / logic ) .

Ontology Characteristics

i. Classes or concepts with subclasses (e.g. the concept car /saloon).

ii. Roles or properties of classes ( e.g. Peugeot 508).iii. Role properties limitations (e.g. does not fly ) .iv. Relationships (between concepts ie saloons belong to cars).Ontologies Lifecycle.

Design principles

i. Clarity (clear objective terms , formalism).ii. Cohesion consistency of findings with their definitions.iii. Scalability without revising existing terms .iv. Simple Coding devised for use by mobile operators .v. Limited specificity ( to be performed by each user later ). vi. Show related concepts with the same principles.vii. Standardization of names according to the nomenclature .

Ontology Development Tools

Programming languagesFrom CyCL (1990) to OWL (2003)which we will use here.

Special Software

Several exist like EvoOntis, Altova SemanticWorks, Amine, The Apelon DTS, DOME, FlexViz, Knoodl but here we will use Protégé.

Modeling pervasive environment user profiles

We use OWL and Protégé for the ontologies and project Atraco for the environment design.Environment Design Phasesi. Specifications ii. Realization iii. Review

We see besidei.Classes (orange)ii.Object Properties(blue)iii.Data type properties (green)

Static user features

User profile has i.A permanent sub-profile(name, weight, sex, disabilities,neighbors)ii. Many temporary sub-profiles(depending of the user action,application preferences,environment etc,Depending upon the user’s place, time, mood etc.(user context)

Extended User preferences

Below we see the User Preferences (ie music services) and their mutual relations in full expansion.

Navigation system user profile modeling

Navigation system modeling.User’s skillsi. Conscious navigation with knowledge of the environment.ii. Spatial Ability, orientation, visualization and relationships. iii.Wayfinding, especially in unknownspace.

General system architecture

i. Navigation service (user interface with the rest of the system) .

ii. Navigation Ontology (spatial navigation concepts).

iii. Navigation user’s ontology (classifying users based oncharacteristics)iv. User’s destination Symbolic

Positioning System .v. Internal space topology(indoor space visualization).vi. Routing algorithm(calculate optimal

route between two points).

Navigation user properties

Below we see user ontology concepts properties ( e.g. name, age , blindness , pregnancy etc).

Concept name Properties Relationship Description User hasName

canWalk isBlind hasCardiopathy isLazy isPregnant

hasAge Describes basic characteristics of the user

LazyUser It’s a specialization of class User (defined class)

BlindUser « PerceptuallyResctrictedUser « PhysicallyResctrictedUser « HandicappedUser « PregnantUser « CardiopatheticUser «

Navigation user properties

i. General elements (age, sex, residence etc).ii. Cognitive characteristics (consciousness, orientation capability,

memory, calculation execution).iii. Sensory abilities (visual acuity, audio perception).iv. User Mobility(fully controllable or with the help of a third person

or a wheelchair). v. Navigation User Preferences (e.g. shortest route preferences ).vi. User interface preferences(depending on the device, mobile

phone, information form digital , printed etc).

The End!!