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1.
《系统科学与信息学报》2020,(2)
Material incentive is the main motivation for solvers to attend crowdsourcing tasks. So raising the bidding success rate is benefit to inspire the solvers attendance' and increase the answering quality. This paper analyzes the effect of participation experience, task-fit capability, participation strategy and task attribute on the solvers bidding success by the solvers attending the series tasks of Tripadvisor. The results show that: 1) Participation times enrich the participation experiences and promote the bidding success, while bidding success times and last performances lower the bidding success because of the cognitive fixation; 2) The chance of bidding success will be increase when the solver own high task-fit capability; 3) The relationship between task submit sequence and bidding success is the type of reverse U shape, and the optimal submit sequence rate on the top of the reverse U shape; 4) Higher task difficulty lower bidding success, while higher task density easier bidding success. 相似文献
2.
Your Vision or My Model? Lessons from Participatory Land Use Scenario Development on a European Scale 总被引:1,自引:0,他引:1
Axel Volkery Teresa Ribeiro Thomas Henrichs Ybele Hoogeveen 《Systemic Practice and Action Research》2008,21(6):459-477
Participatory processes in scenario development have received increasing attention throughout the last years. Combining qualitative
stakeholder and quantitative expert information (i.e. modelling) offers unique opportunities to mix good data, scientific
rigour, imagination and expertise from different perspectives. However, this task is all but easy as it requires a careful
balancing of approaches and an acceptance of different levels of knowledge and trust in different methods across disciplinary
boundaries. In spite of a growing body of literature we are still in the early stages of learning how to deal effectively
with participatory scenario development. In the PRELUDE project of the European Environment Agency a relatively far-reaching
participatory approach to scenario development was applied: a group of stakeholders from across Europe was given full responsibility
to develop long-term alternative land use scenarios in cooperation with experts and modellers. The scenarios have been used
in a formal outreach process with key clients and stakeholders at the European and Member State level afterwards. The aim
of this paper is to document the methods used, analyse their strengths and weaknesses and draw some general conclusions regarding
participatory processes in scenario development. This paper argues that in future scenario development more attention needs
to be paid to strengthen the integration of qualitative and quantitative analysis. A set of compelling and coherent storylines
can effectively trigger strategic conversations among policy-makers and key stakeholders about potential future developments
and related response strategies. A weak integration with quantitative results can undermine this outcome, which is one of
the ultimate objectives of any scenario exercise.
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Axel VolkeryEmail: |
3.
In order to build a low-risk Fund of Funds(FOF), from the perspective of correlation, the principal component factor is used to improve the traditional risk parity model. Principal component analysis is used to decompose the underlying assets and generate unrelated principal component factors,and then the authors can construct a principal component risk parity portfolio. The proposed empirical results based on China’s mutual fund market show that the performance of principal component risk parit... 相似文献