We demonstrate BEACON, the simplest possible file format to exchange links. It is successfully used by more than 50 institutions to provide links to be aggregated by Wikipedia and other projects. Link servers and aggregation Although links are its most powerful feature, the WWW is primarily build of documents. The limitation to embedded, outgoing hyperlinks, instead of links as first class obje...

While IEEE 802.15.4/Zigbee is a promising technology for Wireless Personal Area Networks, several transmission problems are not yet resolved. In particular, the problem of beacon transmission interferences is causing the device connection loss to the network. In order to resolve this problem, we present a new distributed and reactive procedure for beacon collision resolution. It is an extension...

Wireless sensor networks (WS s), made of collection of small, cheap, low power sensors, have diverse applications in several domains of life. Most of their applications demand for spatial position of sensors. Beacon nodes which already know their location are mostly used to help other sensor nodes to locate their position. However localization of sensors in a hostile environment is a crucial is...

We establish tight bounds for beacon-based coverage problems, and improve the bounds for beacon-based routing problems in simple rectilinear polygons. Specifically, we show that bn6 c beacons are always sufficient and sometimes necessary to cover a simple rectilinear polygon P with n vertices. We also prove tight bounds for the case where P is monotone, and we present an optimal linear-time alg...

Presensi perkuliahan merupakan kegiatan untuk pencatatan kehadiran mahasiswa dalam proses belajar mengajar. Diantara kendala presensi di kelas adalah bagaimana memastikan bahwa memang benar dilakukan oleh yang berada tersebut. Penelitian ini bertujuan menerapkan teknologi beacon bluetooth low energy (ble) pada dikelas. Beacon perangkat kecil memancarkan sinyal melalui berisi informasi tertentu....

Optical aberrations due to the inhomogeneous refractive index of tissue degrade the resolution and brightness of images in deep-tissue imaging. We introduce a confocal fluorescence microscope with adaptive optics, which can correct aberrations based on direct wavefront measurements using a Shack-Hartmann wavefront sensor with a fluorescent bead used as a point source reference beacon. The resul...

Time of Arrival (TOA) observations from local beacon signals can be used to augment and provide a back-up navigation source for GPS signals in a Software Defined Radio (SDR). The addition of inertial sensor inputs to the SDR offers the ability to track down to much lower power levels for both the GPS and TOA signals, effectively deal with multipath, and recover more quickly from signal outages....

Position mobile node coordinate is a key component to determine the accuracy and efficiency of positioning in wireless sensor networks. Flexible location algorithm admits to adjust the accuracy and time cost of positioning based on the users references. This paper develops a location algorithm named Signal Strengthening Dynamic Value (SSDV) based on the database of RSSI to position the mobile n...

Underwater navigation and localization using single range measurements presents low–cost alternative to well established underwater localization systems. In this paper, single range localization with respect to stationary and mobile beacon is presented. Also, observability properties of single range localization systems are given and vehicle trajectories which ensure observability are character...

According to IEEE 802.11 protocol, beacon frames are periodically transmitted by the Access Point (AP) and carry mostly network specific information. All the wireless stations (or wireless clients) with in the "vicinity" of transmission range of AP receive corresponding beacon and use the information embedded in it for various purposes. The arrangement of information in beacon is standardized b...