Conventional spread spectrum communication methods essentially map a discrete symbol from an alphabet to a length-N real valued sequence, which represents a point in the N-dimensional signal constellation. The real valued sequence is in turn transmitted over a communications channel. However, communication schemes for the purpose of multimedia steganography (or data hiding) have to transmit the...

Users’ preference such as rating only provides uni-dimension information, but reasons behind users’ preference may be related to various aspects of an item, such as the types, certain attributes. By observing user-generated review always provides such rich information, we proposed an item representation based on review data. This approach supports semantic operation, which could potentially ena...

When JPEG images are used as cover objects for data hiding, many existing techniques require the images to be fully or partially decompressed before embedding. This makes practical application of these methods limited. In this paper, we investigate ways to hide data in the compressed domain directly and efficiently, such that both the original content and the embedded message can be recovered a...

We have explored design opportunities to enrich the tourism experience of people at the Georgia Aquarium by providing a context of photos and by motivating people to be active creators of content to share their experiences with others. We designed a system named RevisiTour to enable visitors to reorganize photos taken from tour sites and share the photos with others. A visitor’s path and timest...

Online communities’ viability and success are dependent on current members’ active participation and content contribution, as well as on the sustainable community registration of new members. Based on the member-life cycle perspective, this study attempted to discover mechanisms that might be employed to increase new members’ community participation. This study focused on user-generated content...

The notion of authorship is a core element in antipiracy campaigns accompanying an emerging copyright regime, worldwide. These campaigns are built on discourses that aim to 'problematize' the issues of 'legality' of content downloading practices, 'protection' for content creators and the alleged damage caused to creators' livelihood by piracy. Under these tensions, fandom both subverts such dis...

While online communities have become increasingly important over the years, the moderation of user-generated content is still performed mostly manually. Automating this task is an important step in reducing the financial cost associated with moderation, but the majority of automated approaches strictly based on message content are highly vulnerable to intentional obfuscation. In this paper, we ...

The large volume of user-generated content on the Social Web puts a high burden on the participants to evaluate the accuracy and quality of such content. Researchers have been trying to address this problem by focusing on discovering influential entities inside social platforms to guide their ranking algorithms. Often these entities correspond to people or organizations already influential in t...

Social Business Intelligence (SBI) relies on user-generated content to let decision-makers analyze their business in the light of the environmental trends. SBI projects come in a variety of shapes, with different demands. Hence, finding the right cost-benefit compromise depending on the project goals and time horizon and on the available resources may be hard for the designer. In this paper we ...

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 circular city. In a first step, we consider...