Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

One of mEducator Research Goal:

•Facilitate search and retrieval in the resource sharing process

•How: analyze the type of information that can be generated during the repurposing activity and find ways to coordinate it with all the information spaces that pertain to a LR to improve the search and retrieval capability of the content sharing system.

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

premises

•How do we search?– Focused VS exploratory search

•How do we repurpose?

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

LR Repurposing model

repurposed to

LRn

LR1

LRm

repurposed to

repurposed to

Repurposing DescriptionWhy (intended goals)

Activity (intended usage)

Repurposing links:Typed (repurposing contexts)

Weighted

Engagement?

Diagnostic reasoning?

Perceptual discrimination?

Conceptual model?

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Adding the social dimension…

LR metadata scheme

Tags space

Links space

Authors/Users space Reuse

& Activity space

LRm

Description

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Adding the social dimension…

LR metadata scheme

Tags space

Links space

Authors/Users space Reuse

& Activity space

LRm

Description

Multimedia Processing

Agents

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Adding the social dimension…

LR metadata scheme

Tags space

Links space

Authors/Users space Reuse

& Activity space

LRm

Description

Multimedia Processing

Agents

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Key aspects of the proposal

• Authors/users of the LR describe the repurposing activity that is anchored to the type of learning outcome and the intended strategy of use

• Usage of a clustering and association building method that supports exploratory search (so far overlooked)

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Exploratory Search

Search ProcessFocused

Search

Exploratory Search

I know exactly what I’m looking

for

I have a broad intuition of what I’m

looking for

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Exploratory Search

Search ProcessFocused

Search

Exploratory Search

The search process is

integral to query refinement

The search process is

integral to query refinement

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Possible solutions

Search ProcessFocused

Search

Exploratory Search

MetadataMetadata User-generated tagsUser-generated tagsvs

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

The problem we’re interested in

Search ProcessFocused

Search

Exploratory Search

MetadataMetadata User-generated tagsUser-generated tags

Repurposing informationRepurposing information

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

The problem we’re interested in: “Analogical” retrieval

“Query Matching” Retrieval

Exploratory Search

Metadata (LOM)Metadata (LOM)

User-generated tagsUser-generated tags

Repurposing: LinksRepurposing: Links

User Query

“Analogical” Retrieval

Repurposing: Usage descriptions

Repurposing: Usage descriptions

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20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

“Query matching” vs “Analogical” retrieval

“Query Matching” Retrieval• High precision

• Low recall

• Recall can be enhanced by semantic expansion

Similar experiences not necessarily described by same terms

Innovative practices described with unknown terms

Shortcomings:

Lexical-semantic similarity

Lexical-semantic similarity

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

“Query matching” vs “Analogical” retrieval

Similarity notion between Learning Resources is based on

- structural properties

- abstracting functionalities and roles from descriptions

Foundations:

“Analogical” Retrieval

• High recall

• Low precision

• Precision can be enhanced by post-hoc “query matching” filters

Description patterns similarity

Description patterns similarity

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

The method

• Moving from vectorial description of the LR to unsupervised classifications of descriptions

• Create a space of associations• Explore this space by

coordinated usage of analogical and standard query matching

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Step 1: LR vectorial representation

Id -LR LOMs TAGs Usage Repurposing 1

2 3

4

5 6

7

8 9

10

LR metadata scheme Tags

space Links space

Reuse & Activity space

Description

Description

LR vectorial representation

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Step 2: classification and positive features extraction

Id -LR LOMs TAGs Usage Repurposing 1

2 3

4

5 6

7

8 9

10

L1, L2

CU1

CR1

CU2

CU3

CL3CL4

CL1

1, 3, 4, 8

CL2

5, 7, 8 CT1

1, 3, 8, 9

CT2

CT3

L 3T1, T6 U3, U5

3, 8, 9, 10

5, 7, 8

2, 6, 7, 10

U1

CR2

CR3

R4

Unsupervised classifier (Kohonen SOM)

Positive features are the most shared ones in the class

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Step 3: deriving the associations

R4

L1, L2

CU1

CR1

CU3

CL3CL4

CL1

1, 3, 4, 8

CL2

5, 7, 8 CT1

1, 3, 8, 9

CT2

CT3

L 3T1, T6 U3, U5

3, 8, 9, 10

5, 7, 8

2, 6, 7, 10

U1

CR2

CR3

CU2

L1,L2 T1,T6

T1,T6 U3, U5

U1 R4

L1,L2 U3, U5

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Step 4: joint use QR and AR

R4

L1, L2

CU1

CR1

CU3

CL3CL4

CL1

1, 3, 4, 8

CL2

5, 7, 8 CT1

1, 3, 8, 9

CT2

CT3

L 3T1, T6 U3, U5

3, 8, 9, 10

5, 7, 8

2, 6, 7, 10

U1

CR2

CR3

CU2

L1,L2 T1,T6

T1,T6 U3, U5

U1 R4

L1,L2 U3, U5

Associations are signalled of their classes share a number of elements above a user set threshold

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Step 4: joint use QR and AR

Query

matching

1th Module

User Query d1 d7

Analogical

Retrieval 1th module

CL1 CT1 CU2 CR3

Analogical

Retrieval

2nd moduleLexical Filter

CL1 CU1 Analogical

Retrieval

3rd module

L1,L2 T1,T6 L1,L2 U3,U5 U1 R4

Analogical

Retrieval

4th module

L1 T6 d1 d3 d8

Query

matching

2th Module

Lexical Filterd3 d8

d1d3d4d8d9

d10

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

The opportunities….

• No commitmente to a priori organization of the metadata

• Independent classification on subsets

• Incremental addition of other information spaces

• Capturing contexts and practices that do not share a common vocabulary yet

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

The challenges….

• Periodic indexing and re-classification

• Some info that is input to classification spaces more difficult to automatically collect in a distributed repository model

• Usable interfaces to support the exploratory process

• Evaluation of suitable metrics for the classification

Plovdiv, Plovdiv, Bulgaria 21-01-Bulgaria 21-01-

20102010

D. Giordano, E. Kaldoudi et al. D. Giordano, E. Kaldoudi et al. 2nd Int. Workshop on Multitype 2nd Int. Workshop on Multitype Content Repurposing in Medical Content Repurposing in Medical

Education Education

Thanks for your attention!

Questions?