Learn More
This paper proposes an algorithm to better solve the exploration-exploitation dilemma faced by model-less reinforcement learning agents. The main contribution is twofold: (1) The two facets of the exploration-exploitation dilemma are distinguished: in some cases, the agent faces a non-stationary environment, therefore it needs to choose the best moment to(More)
This paper studies the competition between Web 2.0 communities in a game theoretic framework. We model three important features of these institutions: (i) firms’ content is usually user-generated; (ii) consumers’ content preferences are governed by local network effects, and (iii) consumers have strong tendencies to multi-home. Our analyses reveal that(More)
Mesoporous TiO2 has gained increasing interest because of its outstanding properties and promising applications in a wide range of fields. Herein, we report the facile synthesis of ordered mesoporous black TiO2 (OMBT) materials, which exhibit excellent photocatalytic hydrogen evolution performances. In this case, the employment of a thermally stable and(More)
This work introduces a new approach to fake finger detection, based on the analysis of human skin elasticity. When a user puts a finger on the scanner surface, a sequence of fingerprint images which describes the finger deformation process is captured. Then two features which represent the skin elasticity are extracted from the image sequence: 1) the(More)
Acknowledgement: The generosity of 1000mercis Research Lab with data and managerial guidance has been invaluable. The assistance of Ilian Mihov on econometric issues is gratefully acknowledged. We thank Hubert Gatignon, Harald Hau, Andrew Stephen and seminar participants at INSEAD Brown Bag Seminar (2009) for their comments and suggestions. Finally, we(More)
T paper studies competition between firms whose “products” (content) are generated by their customers (users). Video sharing sites, social networks, online games, etc. all rely heavily on user-generated content and have been growing significantly in the last decade. We model a Hotelling style market in which consumers have heterogeneous tastes along a(More)
This paper studies the strategic aspects of contextual advertising. Such advertising entails the display of relevant ads based on the topic of the content a consumer views and takes advantage of the possibility that consumers’ content browsing preferences are indicative of their product preferences. The results show that contextual targeting impacts(More)
This paper studies competition between social media sites in a game theoretic framework. We model three important institutional features of social media sites: (i) firms’ content is usually “user-generated”; (ii) consumers’ preferences are governed by local network effects, and (iii) consumers have strong tendencies to multi-home. In such a setting, ex-ante(More)
This paper studies the competition between firms for influencers in a network. Firms spend effort to convince influencers to recommend their products. The analysis identifies the offensive and defensive roles of spending on influencers. The value of an influencer only depends on the in-degree distribution of the influence network. Influencers who(More)