No description available.

No description available.

Bluetooth is a highly promising, low-cost, and low-power technology for short-range wireless communication. It is intended to replace existing cables between electronic devices. Bluetooth is an open specification. Even whose MAC protocol is designed for facilitating the construction of ad hoc networks, the issue of scatternet formation is left open in the Bluetooth Specification. Several researchers have proposed various solutions to form a scatternet. But most of them focused on static environment. This investigation presents an Adaptive Scatternet Formation Scheme (ASFS) for forming a scatternet for Bluetooth devices. Unlike earlier work, the proposed method is designed to work with dynamic environment where nodes can arrive and leave arbitrarily. ASFS consists of two parts, formation and maintenance. In formation, a coordinator is used to monitor the flow of nodes (arriving and leaving). This information is then used to assign the new arrival node a suitable role (Sub-coordinator, Master or Slave) to establish the link and assign it to an appropriate piconet. In maintenance, nodes are allowed to arrive and depart arbitrarily. The proposed method can incrementally extend the topology and heal the partitions of scatternet due to nodes arriving or missing. It dynamically adjusts the scatternet to minimize the number of piconets. We employed the Network Simulator, NS-2, as the simulation and analyzed the predicted results when nodes arrive in various conditions. The simulation result demonstrates that ASFS achieves better results than TSF (Tree Scatternet Formation, the algorithm is proposed by Tan et al.[17] and works well in dynamic environment) in packet transmission time and number of the piconets. The scatternet formation time reflects the advantage of parallel formation.

Bluetooth is a low cost, low power consumption, short-range radio technology working on the 2.4 GHz frequency band. Recently, several typical polling schemes have been presented to enhance the performance on asymmetric transmissions between the master and slave. However, such polling algorithms consider only either the uplink queue or the downlink queue state for scheduling. In this paper, we propose an algorithm for Bluetooth Piconets scheduling, called the Uplink and Downlink queue Polling Scheme (UDPS). The goal of this scheduling algorithm is to alleviate the wasted bandwidth by diminishing the visit to inactive slaves. Distinguishing from previous polling schemes that have been proposed, this algorithm considers on both uplink and downlink queue states for increasing the throughput and reducing the delay time of the piconets communication. This study proposes UDPS, a new Polling Scheme for Bluetooth piconets addresses both Uplink and Downlink queues, considering to remain fair and efficient in asymmetric flow rates. Simulations confirm that the performance of the UDPS compares favorably with that of traditional polling approaches.

Thesis (M.S. in Computer Science)--Washington State University. / Includes bibliographical references.

Thesis (M.S.)--Washington State University. / Includes bibliographical references.

This paper proposes a device capable of acquiring an electrocardiogram (ECG, EKG) signal to be hosted by a typical Android smartphone. Bluetooth is used as the data connection. Once acquired, the signal is graphed on the display of the smartphone. A basis of physiology behind the ECG is presented. The data acquisition system and the performance of the ECG amplification and supporting circuits are analyzed. / text

ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV / Most of today's aircraft used for the commercial transport of passengers or military aircraft still rely on simple technology such as cables, connectors and sensors to provide power, avionics data, control system, aircraft instrumentation etc. throughout the vehicle's life-cycle for flight monitoring and fault diagnosis. Despite a marked improvement in the quality and reliability of these components, they continue to be the main cause of failures due to corrosion, misuse, improper installation, etc, using-up endless man-hours to troubleshoot, repair and upgrade them. Wireless monitoring by telemetry of some of the critical systems has been in use for some time as a point to point data link designed to provide vital information, potentially improving the safety and efficiency of any flight. Aircraft manufacturers are now looking at the use of wireless networks to replace current data buses used for the transfer of data between avionics systems and their sensors as well as for the control of some of the surface actuators. Wireless networks used in this way could reduce the amount of cabling and its associated weight as well as simplify the re-routing of connections making upgradation less expensive and quicker, again a benefit to airlines. Despite many benefits there is a potentially serious security issue by means of an introduction of a backdoor into the system, meaning that before aircrafts become network-enabled, all the security issues must be identified in full and dealt with.

Dortmund, Techn. Universiẗat, Diss., 2008.

Submitted by Pós-Com Pós-Com (pos-com@ufba.br) on 2011-12-02T23:12:04Z No. of bitstreams: 1 Macello-Santos-de-Medeiros1.pdf: 8461524 bytes, checksum: 69b5dd9f87a83ecb053e97707033dd14 (MD5) / Made available in DSpace on 2011-12-02T23:12:04Z (GMT). No. of bitstreams: 1 Macello-Santos-de-Medeiros1.pdf: 8461524 bytes, checksum: 69b5dd9f87a83ecb053e97707033dd14 (MD5) / Ao adentrar um estabelecimento comercial, um cliente portando um celular recebe o seguinte aviso: "Este estabelecimento quer enviar uma mensagem para você. Você aceita?" Ao aceitar, este cliente é presenteado com um cupom de descontos para utilizar na compra de produtos do estabelecimento. Esta é uma situação inusitada na comunicação, algo impensável antes do advento do celular, que utiliza a conexão Bluetooth, uma tecnologia capaz de enviar e receber mensagens a curta distância e sem custos, presente neste artefatos móveis digitais. O presente trabalho propõe realizar um estudo sobre as zonas Bluetooth tendo como ponto de partida a análise do lugar na comunicação com base em quatro formas: a Comunicação Local, a Comunicação Situada, a Comunicação Global e a Comunicação Locativa. Para tanto, foram utilizados três aspectos na análise: o tipo de interação, os meios técnicos de transmissão e os contextos de produção/emissão e recepção de informação. O objetivo da pesquisa é perceber como as zonas Bluetooth são capazes de criar uma forma inovadora de comunicação, a Comunicação Locativa, na qual o lugar reassume sua importância, como pode ser verificada numa interação face a face. Durante a pesquisa, foram identificadas quatro práticas: Bluetooth P2P, Bluetooth Marketing/Advertising, Bluetooth News/Info e Bluetooth Mapping/Tracking, diferenciadas pelo conteúdo disponibilizado, pela finalidade da prática e o alcance da tecnologia. Todas elas são exemplos de Comunicação Locativa, capazes de comprovar a retomada do alto grau de relevância do lugar na comunicação.