four aspects of relevance: content, time, location and network pasi fränti, jinhua chen and andrei...
TRANSCRIPT
Four aspects of relevance:content, time, location
and network
Pasi Fränti, Jinhua Chen and Andrei Tabarcea
MOPSIPROJECTMOPSI
PROJECTUNIVERSITYOF EASTERN
FINLAND
UNIVERSITYOF EASTERN
FINLAND
• Search engines• Recommendation systems• Web mining• Event detection• Push/pull notifications• Clustering• Social networks• GPS tracectory analysis• Road network extraction
Preliminary content
wwwwwwwwwwww
Data Collection in MOPSI System
GPS
Data collector:
Other users:
MOPSI webpage/ Facebook
Service directory
N 62.63 E 29.86
User collection
Last skiing of winter
User: Pasi
Last skiing of winterDate: 4.4.2010Location: N 62.63 E 29.86Arppentie 5, Joensuu
User: Pasi
Keywords: skis, forest, snow Informal description
Relevance defined by the network of the user
Date and time (not expected in July)
1. Content
2. Time
3. Location
4. Social network
Exact coordinates Address for usability
Four aspects of relevanceExample from practice
1. Content2. Time
3. Location
4. Network
Last skiing of winterDate: 4.4.2010Location: N 62.63 E 29.86Arppentie 5, Joensuu
Content of picture
Keywords orinformal description
snow
skis
User: Pasi
Aspect 1: Content
1. Content
2. Time3. Location
4. Network
Last skiing of winterDate: 4.4.2010Location: N 62.63 E 29.86Arppentie 5, Joensuu
Date
Not expected in
July
User: Pasi
Aspect 2: Time
1. Content
2. Time
3. Location4. Network
Last skiing of winterDate: 4.4.2010Location: N 62.63 E 29.86Arppentie 5, Joensuu
Exact coordinates
Address forusability
User: Pasi
Aspect 3: Location
1. Content
2. Time
3. Location
4. Network
User: Pasi
Relevance of data is defined by social or other network
Aspect 4: Network
MOPSI Description: Picasa Flickr All Real
Places --- 28% 21% 32% Events and action 31% 17% 5% 7% People 6% 7% 6% 10% Objects --- 5% 8% 12% Architect & Nature 25% 21% 23% 37% Animals --- 3% 2% 2% Other 20% 16% --- 0% Garbage 19% 2% 35% ---
Data Collection in MOPSI System
Content: Description:
Urban 121 People 68 Nature 54 Events 13 Documents 13 Animals 11 Others 25
Office & Computers 196 Other test photos 153 Failures 155
Places 36 Events and action 24 People 21 Objects 20 Architecture and nature 11 Animals 5
Garbage 228 None 464
Photos by categories in MOPSI
Description of pictures of people
• People by their name or role:- Runner
- Floorball player
• Related to place:- Untung / STMIK
- Young Andrei
- My son Amir
• Among the pictures of people, 31% (21/68) has some kind of identity.
Description of events
• Content or location not enough.
• Description adds to the relevance.
• Examples:- Work: ecse, abi, mopsi meeting, ubiikki- Running competition: Åland half marathon- Actions attached with feelings:
quality time in skiing elevator.
Location of travel photos
• Not easily recognized from content.• Can be concluded from GPS data.• Descriptions are used anyway:
- Locations as such: Clarke Quay, Geger beach, Suceva, Tahkovuori and Aholansaari (location
- With additional details: Petronas Towers, Heureka, Singapore flier, Olavin linna.
- With additional feelings: Musta Pekka mutkan takana (Black Pete behind the curve)
MOPSI Description: Picasa Flickr All Real
Places --- 28% 10% 31% Events and action 31% 17% 7% 21% People 6% 7% 6% 18% Objects --- 5% 6% 17% Architecture and nature 25% 21% 3% 9% Animals --- 3% 1% 4% Others 20% 16% --- 0% Garbage 19% 2% 66% ---
Comparison with Picasa and Flickr
Phone: Accuracy:
Nokia 6110n 2.73 Nokia N95 (slider open) 3.13 Pretec external GPS 3.61 Garmin Forerunner 3.69 Nokia E72 3.76 Nokia E66 5.10 Nokia N-95 (slider closed) 6.05 Fortuna external GPS 6.44
Accuracy of mobile GPS
Technical problemsAsynchronous problem (1) Asynchronous problem (2)
Low illumination Interrupted transmission