1. Jeonghwan Jeon December 10, 2007
Recommendation System Evoluation Map by Tracking Patent Citation Network
Jeonghwan Jeon
December 10, 2007

2. Contents Ⅰ. Introduction Ⅱ. Citation network Ⅲ. Case study
6. Additional chapter in this paper
Ⅳ. Conclusion

3. Introduction Background Objective
Existing of many recommendation algorithms
Dependancy on experts for the analysis and forecast of IT technology
Need for systematic approach to understand the technology development
Objective
To propose the recommendation system evoluation map
By tracking patent citation network

4. [Normal form of citation network]
Network form
Node: each patents
Directed link: citation between each patents
[Normal form of citation network]

5. Citation Network Literature review Relation analysis
Management of technology: themes, concepts and relationships (Pilkington and Teichert, 2006)
Scientific collaboration of new 10 EU countries in the field of social sciences (Marshakova-Shaikevich, 2005)
Forecasting the technology development
Topological analysis of citation networks to discover the future core articles (Shibata, Kajikawa, Matsushima, 2007)
Inventive progress measured by multi-stage patent citation analysis (Wartburg, Teichert, Rost, 2005)
Development path
Connectivity in a citation network: The development of DNA theory 
(Hummon, Doreian, 1989)
Mapping Technological Trajectories as Patent Citation Networks: A Study on the History of Fuel Cell Research 
(Verspagen, 2007)

6. Citation Network Evaluation of Connectivity (Hummon and Doreian, 1989)
Search path node pair (SPNP) algorithm
SPNP( ) =
= node i & the number of patents which node I cites
= node j & the number of patents which node j is cited
Path
The more citation, the more important link
The higher the connectivity, the more used the path i j

7. Citation Network Evaluation of Connectivity (Hummon and Doreian, 1989)
Main path

8. Case study Research Field : Recommendation system Search Condition
Search tool : USTPO Patent Database (
Search keyword : Recommendation & system (search at abstract field)
Search period: ~
Search Result
Search patents : 164 patents
Network drawing program : Ucinet 6 for windows (ver 6.174)

9. Case study US
System and method for adaptively selecting and delivering recommendations to a requester,
OutlookSoft Corporation (2001) US
System and method for recommending items, Neonics, Inc. (1989) US
Methods and apparatus for implementing internet storefronts to provide integrated functions,
Oracle (2000)

10. Conclusion Summary Future work Tracking patent citation network
Proposing the recommendation system evoluation map
Future work
To choose more exactly relating keyword
To generate main path of citation network
To categorize each clusters and derive latent meaning of each clusters

11. Jeonghwan Jeon December 10, 2007
THANK YOU & BEST WISHES
Jeonghwan Jeon
December 10, 2007