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Recent years have seen a significant increase in the number of sensors and resulting event related sensor data, allowing for a better monitoring and understanding of real-world events and situations. Event-related data come from not only physical sensors (e.g., CCTV cameras, webcams) but also from social or microblogging platforms (e.g., Twitter). Given the wide-spread availability of sensors, we...
In the Internet of Things (IoT), small-scale embedded devices monitor and control real-world objects with different kinds of sensors and actuators. Often, devices communicate measurements and states using proprietary encodings, with the benefit of having all data stored in a central location, e.g., the Cloud. The drawbacks are that all data needs to be collected in advance, even if it is not used...
With the proliferation of Smart Cities, more and more live data sources such as webcam feeds and physical sensor information are publicly accessible over the Web. However, these sources are typically decoupled from normal websites, and are therefore not within the scope of traditional online search using Web search engines. In this paper, we focus on websites that refer to physical locations (e.g...
Location-based services gained much popularity through providing users with helpful information with respect to their current location. As a recent trend, virtual location-based services consider webpages or sites associated as 'virtual locations' that online users can visit. The presence of links between virtual locations and the corresponding physical locations (e.g., geo-location information of...
Despite the services of sophisticated search engines, there are interesting information sources which are useful but largely inaccessible to current web users. These sources are often ad-hoc, location-specific and only useful for users over short periods of time, or relate to tacit knowledge of users or crowds. The solution presented in this paper introduces an integrated concept of "location"...
The investigation of the browsing behavior of users has been a topic of active research since the Web started. However, new online services changed the meaning behind "browsing the Web" and require a fresh look at the problem. Platforms such as YouTube or last. Fm have started to replace the traditional media channels (cinema, television, radio) and media distribution formats (CD, DVD, Blu-ray)...
Distributed NoSQL systems aim to provide high availability for large volumes of data but lack the inherent support of complex queries often required by overlying applications. Common solutions based on inverted lists for single terms perform poorly in large-scale distributed settings. The authors thus propose a multiterm indexing technique that can store the inverted lists of combinations of terms...
Finding relevant and reliable information on the web is a non-trivial task. While internet search engines do find correct web pages with respect to a set of keywords, they often cannot ensure the relevance or reliability of their content. An emerging trend is to harness internet users in the spirit of Web 2.0, to discern and personalize relevant and reliable information. Users collaboratively search...
In open environments, deciding if an individual is trustworthy, based on his past behavior, is fundamentally important. To accomplish this, centrality in a so-called feedback graph is often used as a trust measure. The nodes of this graph represent the individuals, and an edge represents feedback that evaluates a past interaction. In the open environments envisioned where individuals can specify for...
User-generated content in the spirit of Web 2.0 is a promising means to improve the search for relevant information on the web, particularly multimedia content. The idea is that user col-laboratively search or browse for information, either directly by communicating or indirectly by adding meta information (e.g., tags) to web pages. However, current solutions are bound to specific web sites providing...
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