Competing to Share: the Taskcn Knowledge Sharing Community
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This is presented in the ICWSM 2008, Seattle, by Jiang Yang, Lada Adamic, Mark Ackerman of the School of Information, University of Michigan
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of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
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Competing to Share: the Taskcn Knowledge Sharing Community
- 1. Competing to Share: the Taskcn Knowledge Sharing Community Jiang Yang, Lada Adamic, Mark Ackerman School of Information, University of Michigan April, 2008 Witkey
- 2. “ Witkey” Mechanism A user posts a question/task, and deposits money as the award onto the website Other users submit their solutions to the website Upon the deadline, the requester choose the winner/s The website send s 80% money to the winner/s
- 5. Constructing structural prestige network for both the user and task to understand the participation structure A Social Network Approach:
- 6. User’s Prestige Network A B C D X Y win win
- 7. Task’s Prestige Network A B C X Y win win Z
- 8. Scale-free Distribution of Prestige
- 9. Motif: looking into the structure loops Symmetrical triads
- 10. Understanding basic participation pattern
- 13. Prediction: the probability for a user to win in a task Result: significant: Cox & Snell R Square = .681 The number of submissions of a task will lower down the probability of winning The user’s prestige level (indicated by indegree) will slightly improve the winning chance However, the winning chance is largely determined by the number of submissions. Logit P win=1, lose=0 = β 1 X number of submitters + β 2 X userIndegree +ε B S.E. Wald df Sig. Exp(B) Step 1(a) logSubmit -.818 .015 2870.021 1 .000 .441 Step 2(b) logSubmit -.833 .016 2653.267 1 .000 .435 logUserIndegree .191 .048 15.556 1 .000 1.211
- 16. Thank You! Any Question? Or email me [email_address]
Editor's Notes
- Hello, I am Jiang Yang, I am a second year PHD student in the School of Information at the University of Michigan. Today, my presentation is going to introduce an interesting kind of knowledge sharing website in China and how we created innovative way to analyze people’s participation structures. In China, people call this kind of websites Witkey, which means the key to wisdom. This name is created by the founder of the first Witkey website. Taskcn.com, the witkey website we investigated in this study, is one of the biggest Witkey websites in China.