Oliver Günther

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Search operations in databases require special support at the physical level. This is true for conventional databases as well as spatial databases, where typical search operations include the <italic>point query</italic> (find all objects that contain a given search point) and the <italic>region query</italic> (find all objects that overlap a given search(More)
Popularity of Online Social Networks has been recently overshadowed by the privacy problems they pose. Users are getting increasingly vigilant concerning information they disclose and are strongly opposing the use of their information for commercial purposes. Nevertheless, as long as the network is offered to users for free, providers have little choice but(More)
Despite the considerable amount of self-disclosure in Online Social Networks (OSN), the motivation behind this phenomenon is still little understood. Building on the Privacy Calculus theory, this study fills this gap by taking a closer look at the factors behind individual self-disclosure decisions. In a Structural Equation Model with 237 subjects we find(More)
In times of ubiquitous electronic communication and increasing industry pressure for standard electronic authentication, the maintenance of privacy, or "the right to be left alone" becomes a subject of increasing concern. The possibility of a "transparent human," whose vital information is up for grabs, can most easily be envisioned in the realm of(More)
Despite a broad range of collaboration tools already available, enterprises continue to look for ways to improve internal and external communication. Microblogging is such a new communication channel with some considerable potential to improve intra-firm transparency and knowledge sharing. However, the adoption of such social software presents certain(More)
The problem of information overload on Facebook is exacerbating as users expand their networks. Growing quantity and increasingly poor quality of information on the Newsfeed may interfere with the hedonic experience of users resulting in frustration and dissatisfaction. In the long run, such developments threaten to undermine sustainability of the platform.(More)
The EPC Network is an industry proposal to build a global information architecture for objects carrying RFID tags with Electronic Product Codes (EPC). A so-called Object Naming Service (ONS) is used to locate information sources for these objects in the EPC Network. But ONS is based on DNS, which suffers from well-studied weaknesses in robustness,(More)