The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present a novel system that allows small handheld devices to detect other devices in the local proximity and to exchange messages with them. The client devices use WLAN to access the system via a web interface and do not require additional software or modification of the device's operating system. The physical closeness of client devices is estimated based on their signal strengths measured by...
We propose a global system for acquisition, maintenance and communication of achievements in the real-world. The main focus of the proposal lies on a context-aware notification service for achievements. Users of the system can browse the achievement web application and will only get notifications of users within the same context. The definition of context is based on the network infrastructure of...
In this paper, we proposes a method to utilize the huge number of IEEE 802.11 access points in an inner city environment to distribute information such as local sensor values, votes or short text messages. Due to the overlapping channels on IEEE 802.11b/g it is possible to receive packets from neighboring channels by overhearing. This fact allows every access point to monitor a part of the frequency...
One of the drawbacks of location fingerprinting systems is the effort that is necessary to set up and update the fingerprint database. In this paper, we propose a novel approach to significantly reduce this effort. We split the area of operation into a grid of quadratic cells and then combine these cells into larger regions of similar signal properties using a clustering algorithm and a novel similarity...
We propose a system for acquiring, maintaining, and communicating Real-World Achievements. The concept is based on virtual world systems that are in common use in current Massively Multiplayer Online Games (MMOG) like World of Warcraft or Warhammer Online. The system design is centered around a global database of achievement definitions and individual progress.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.