To prevent scalability problem caused by increasing traffic of real-time applications, cluster architecture with Time Division Multiple Access (TDMA) scheduling scheme is mostly deployed in wireless sensor networks. However, even though it have proven good scalability and suitability for real-time communications, but static scheduling lacks of adaptability in several situations by not admitting...

In IEEE 802.15.4 ZigBee Wireless Sensor Networks, an efficient scheduling mechanism is required for reliable data transmission. Further, concurrent transmission of huge data through CSMA/CA incurs more packet collision rate. This complicated condition has to be eliminated to improve the system throughput. In this study, we propose to deploy cluster based TDMA scheduling mechanism for IEEE 802.1...

This paper details the participation of Pattern Recognition and Intelligent System lab of BUPT in CCR and SSF task of TREC 2013 Knowledge Base Acceleration track. In the CCR task, The PRIS system focuses attention on query expansion and similarity calculation. The system uses DBpedia as external source data to do query expansion and generates directional documents to calculate similarities with...

The Global SAW Tag [1] is projected to be a large-volume SAW device application. The modulation method and overall tag data structure are reviewed for a family of proposed RFID devices. Current implementations use a basic group structure that encodes 16 information bits using 4 reflectors chosen from 75 reflector slots. Several groups are placed in-line on a single acoustic track to achieve ID ...

Many advertisers (bidders) use Internet systems to buy advertisements on publishers’ webpages or on traditional media such as radio, TV and newsprint. They seek a simple, online mechanism to reserve ad slots in advance. On the other hand, media publishers (sellers) represent a vast and varying inventory, and they too seek automatic, online mechanisms for pricing and allocating such reservations...

The Bluetooth technology will enable users to connect a wide range of electronic devices such as laptops, headsets, cellular phones etc. Bluetooth devices can connect to form a piconet, which consists of a master and upto 7 slaves. The master controls the medium access in the piconet using a polling scheme. Two types of connections can be established in a piconet: the Synchronous Connection-Ori...

Two designs of conical-beam array antennas are presented for different fifth-generation applications. They based on slotted cylindrical waveguides and a travelling-wave topology, where the waveguide is used to progressively excite cross-slot array. A total 384 cross-slots, formed by transversal longitudinal slots, grouped in rings eight equally-spaced cross-slots. The propagation TM <sub xmlns:...

Radio communications using ultra wideband (UWB) frequency have rapidly developed since the beginning of the year 2000. This technique offers advantages that made it attractive to a large number of civilian and military applications. The aim of this work is the study of the geometry features of a UWB antenna and the improvement of the bandwidth by inserting slots. To obtain a very large bandwidt...

Polyglutamine (polyQ) tracts in regulatory proteins are extremely polymorphic. As functional elements under selection for length, triplet repeats are prone to DNA replication slippage and indel mutations. Many polyQ tracts are also embedded within intrinsically disordered domains, which are less constrained, fast evolving, and difficult to characterize. To identify structural principles underly...

In this paper, we propose a dynamic TDMA slot reservation (DTSR) protocol for cognitive radio ad hoc networks. Quality of Service (QoS) guarantee plays a critically important role in such networks. We consider the problem of providing QoS guarantee to users as well as to maintain the most efficient use of scarce bandwidth resources. According to one hop neighboring information and the bandwidth...