Consider trade conducted via a platform, such as an online app store or a farmers market. The quality sellers choose for their products affects the surplus trade generates. Because the platform’s profit depends on that surplus, the platform can have an incentive to regulate quality. This is true even if quality is observable at time of purchase or if sellers can develop reputations concerning q...

Although many college courses adopt online tools such as Q&A online discussions, there is no easy way to evaluate their impact on learning. In this paper, we investigate a predictive relation between characteristics of discussion contributions and student performance. For modeling dynamics of conversational dialogue, speech acts (Q&A dialog roles that participants play) and emotional features c...

Online music libraries available on the Web contain a large amount of audio content that is usually the result of digitization of analogue recordings or the direct acquisition of digital sources. The acquisition process is carried out by several persons and may last a number of years, thus it is likely that the same or similar audio content is present in different versions. This paper describes...

The paper explores the use of virtual worlds to support online role-play as a collaborative activity. This paper describes some of the challenges involved in building online role-play environments in a virtual world and presents some of the ideas being explored by the project in the role-play applications being developed. Finally we explore how this can be used within the context of immersive e...

Content created by users is a public affair. In the cultural field of music, this includes diverse activities of listening, sharing, editing, recording. Jacques Attali predicts that music will become a network of composition, where people actively participate in music-as-process, as a form of collective play [Attali, 1985]. Christopher Small coined the term, musicking, to describe music as a so...

Nowadays, music fans are beginning to massively use mobile digital music players and dedicated software to organize and play large collections of music. In this context, users deal with huge music libraries containing thousands of tracks. Such a huge volume of music easily overwhelms users when selecting the music to listen or when organizing their collections. Music player software with visual...

Multicasting in deflection networks is more difficult than in store-and-forward networks, because of the difficulties in sending multiple copies of the same packet on several output ports. On the other hand, deflected packets stray from their optimal paths and may visit the multicast recipients “accidentally,” not necessary in the order envisioned by the sender. We compare a number of simple mu...

The objective of this project is to forecast sales in euros at 1115 stores owned by Rossmann, a European pharmaceutical company. The input to our algorithm is a feature vector (discussed in section 3) of a single day of data for that store. We tried using a number of algorithms, but mainly gradient boosting, to output the predicted total sales in euros for the given store that day. Rossmann pro...