IWAAL 2013 - Mobile NFC vs Touchscreen Based Interaction: Architecture Proposal and Evaluation
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Transcript of IWAAL 2013 - Mobile NFC vs Touchscreen Based Interaction: Architecture Proposal and Evaluation
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DeustoTech - Deusto Institute of Technology, University of Deusto
http://www.morelab.deusto.es
December 3, 2013
Mobile NFC vs Touchscreen Based Interaction: Architecture Proposal and Evaluation
IWAAL 2013
Pablo Curiel, Koldo Zabaleta, Ana B. Lago
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Outline
Introduction
State of the Art
The Platform
Evaluation
Conclusion
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Outline
Introduction
State of the Art
The Platform
Evaluation
Conclusion
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Advances in ICTs
► Increasing number of electronic devices with noticeable computing capabilities.
Introduction
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Advances in ICTs
► Increasing number of electronic devices with noticeable computing capabilities.
► Wide range of advanced services offered.
Introduction
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Usability issues
► Yet accessing these services can be troublesome…
Introduction
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Outline
Introduction
State of the Art
The Platform
Evaluation
Conclusion
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Related Projects
► Several studies have used NFC-enabled phones to ease the interaction with them and provide different services.
► Common approach: Each NFC tag identifies a given service that is fired when the tag is read.
► Extensions to it:
►General tags which identify objects and special tags with additional information or services that those objects provide (Riekki et al.).
► User context as additional condition to determine which service to provide (Riekki et al.).
► Tags that identify services and tags that identify arguments for them. (Broll et al.).
State of the Art
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Our Proposal
A tag represents an object or concept of the real world, not a particular service. Thus, it is the combination of tags read by a user what
determines the service to be provided.
State of the Art
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Outline
Introduction
State of the Art
The Platform
Evaluation
Conclusion
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The Platform
► Activate the most used services on mobile devices by interacting with NFC tags.
► Client-Server architecture
► Three main components:
► The Model
► The Server
► The Mobile Application
Proposed Solution
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The Model
► OWL Ontology where two kinds of elements are modelled.
Proposed Solution
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The Model
► OWL Ontology where two kinds of elements are modelled.
► Real world entities to be represented on NFC tags
Proposed Solution
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The Model
► OWL Ontology where two kinds of elements are modelled.
► Real world entities to be represented on NFC tags
►Hierarchy
Proposed Solution
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The Model
► OWL Ontology where two kinds of elements are modelled.
► Real world entities to be represented on NFC tags
►Hierarchy
► The actions to execute
Proposed Solution
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The Model
► OWL Ontology where two kinds of elements are modelled.
► Real world entities to be represented on NFC tags
►Hierarchy
► The actions to execute
►A combination of different number and types of tags
Proposed Solution
SendEmail
hasAttribute min 1 Contact
Contact
EmailTag hasTag exactly 1
EmailTag
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The Server
► Checks if the combination of tags read by the user is valid…
► And if so, it determines the action they represent.
► Two steps:
► The Rule Engine
► Consistency Checking
Proposed Solution
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The Server – The Rule Engine
► One rule per action or service available.
► Each rule checks if the information of the tags read matches, in principle, to its corresponding action.
► If so, it creates an instance of that action and with the attributes that apply in each case.
Proposed Solution
Rule Engine
Telephone And
Contact instances
Telephone action
with associated Contact
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The Server –Consistency Checking
► Once an action with its corresponding attributes is created, its consistency is checked.
► Types of the attributes
► Cardinality of the attributes
Proposed Solution
Semantic Reasoner
Telephone action
with associated Contact
TelephoneCall
Contact
hasAttribute exactly 1 Contact
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The Server –Consistency Checking
► Once an action with its corresponding attributes is created, its consistency is checked.
► Types of the attributes
► Cardinality of the attributes
► Consistent Action = Valid Action
Proposed Solution
Semantic Reasoner
Telephone action
with associated Contact
Consistent!
TelephoneCall
Contact
hasAttribute exactly 1 Contact
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The Mobile Application – Object Creation
► The representation of the objects in the tags follows the ontological model.
Proposed Solution
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The Mobile Application – Object Creation
► The representation of the objects in the tags follows the ontological model.
Proposed Solution
<PlaceTagUri>
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<PlaceTagUri> <rdf:type> <lnfc:PlaceTag> . <PlaceTagUri> <lnfc:latitude> “51.513016”^^xsd:double . <PlaceTagUri> <lnfc:longitude> “-0.122337”^^xsd:double .
The Mobile Application – Object Creation
► The representation of the objects in the tags follows the ontological model.
Proposed Solution
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The Mobile Application – Action Execution
► When a user reads a combination of tags to execute an action, the URIs written on them are used to retrieve the instance from the triplestore.
► The retrieved instances are sent to the server, which determines the action to execute.
► Finally, the mobile phone provides the service that corresponds according to the action returned by the server.
Proposed Solution
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Outline
Introduction
State of the Art
The Platform
Evaluation
Conclusion
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Evaluation
► Goals
► Validate our proposal
► Compare it to traditional Touchscreen-based interaction
► Hypothesis: Interaction based on NFC is faster and easier for end-users than the touchscreen- based one.
Evaluation
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Experiment design
► Subjects executed three different actions, both with NFC and an ad-hoc touchscreen-based GUI.
► See weather forecast (no params)
►Make a phone call to a contact (one param)
► Send an e-mail to two contacts (two params)
Evaluation
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NFC-based Interaction
Evaluation
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Touchscreen-based Interaction
Evaluation
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Experiment steps
► Application explanation
► Live demo
► Training for one subject group
► Subjects executed the actions
► Half of the subjects first with NFC, the other first with touchscreen
► Post-experiment survey
► Age, Gender, Familiarity with NFC/Touchscreen phones/New technologies in general and subjective impressions
Evaluation
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► 40 Subjects
► Between 20 and 60 years old
Subject characteristics
Evaluation
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► 40 Subjects
► Between 20 and 60 years old
► 30 men and 10 women
► Varied technological skills
Subject characteristics
Evaluation
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► 40 Subjects
► Between 20 and 60 years old
► 30 men and 10 women
► Varied technological skills
► 80% owned a touchscreen phone
► 66% familiar with NFC/RFID
► But only 33% had used a NFC-enabled phone
► 15 subjects trained with the application before the experiment
Subject characteristics
Evaluation
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► Age and technological skills
►Older subjects took less advantage of their smartphones
Subject characteristics - Dependencies
Evaluation
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► Age and technological skills
►Older subjects took less advantage of their smartphones
► Age and phone type
► All subjects under 40 owned a smartphone
Subject characteristics - Dependencies
Evaluation
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► Age and technological skills
►Older subjects took less advantage of their smartphones
► Age and phone type
► All subjects under 40 owned a smartphone
► Age and experience with NFC
► None of the older subjects had used a NFC phone before
► Phone type and experience with NFC
►Only one subject with prior experience with a NFC phone owned a non-touchscreen phone
Subject characteristics - Dependencies
Evaluation
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Subject impressions
► Nearly all subjects found the NFC-based interaction useful
► 75% of the subjects would use it at least occasionally
Evaluation
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Task efficiency
► NFC 0.5 seconds faster on average
► No significant difference between the different actions
► 21 subjects faster with NFC / 19 faster with touchscreen
► Pre-experiment training equal for both interaction approaches
► Subjects with training were 2 seconds faster on average with both technologies.
► No correlation between subjective impressions and task efficiency
Evaluation
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Task efficiency (II)
► Significant correlation between task efficiency and subject age
► Specially for touch-based interaction
►630 ms slower per year increase (P < 0.001)
►Weaker for NFC
►333 ms slower per year increase (P < 0.01)
Evaluation
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Task efficiency (III)
► Interaction time differences (touchscreen time minus NFC time for each subject and task)
► For each year increase in subject age, they are 300 ms faster with NFC (P ≈ 0.001)
►On average, subjects older than 30 are faster with NFC
Evaluation
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Task efficiency (IV)
► Subjects who own a touchscreen-phone are clearly faster with this kind of interaction
► 18 seconds faster on average (P < 0.001)
► While it is not that clear that subjects with previous experience with a NFC phone are faster
► 6 seconds faster on average (P ≈ 0.05)
Evaluation
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Outline
Introduction
State of the Art
The Platform
Evaluation
Conclusion
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Conclusion (I)
► Platform to access the most-used services in mobile phones using NFC.
► New approach for NFC-based interaction: Actions as combinations of tags.
► Proposed interaction scheme considered convenient and useful by test users.
Conclusion
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Conclusion (II)
► NFC also proved faster than touchscreen, specially for…
►Older people (over 30 years old)
► Those less familiar with touch-based interaction
► Those less familiar with new technologies in general
► Learning curve of NFC-based interaction also proved to be low.
Conclusion
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Future Work
► Run a larger scale experiment
► Larger number of subjects, more homogeneous groups
►More subjects in older age groups
►More people with lower technological skills
►Minimize dependency among variables
► Longer in time
► Study the long-term learning effect in both interaction approaches
► Apart from studying task efficiency, measure interaction errors with both technologies
Conclusion
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¡GRACIAS!
THANK YOU!
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DeustoTech - Deusto Institute of Technology, University of Deusto
http://www.morelab.deusto.es
Mobile NFC vs Touchscreen Based Interaction: Architecture Proposal and Evaluation
Koldo Zabaleta