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Angus D.,Engineering School of Information Technology and Communication | Smith A.E.,University of Queensland | Wiles J.,Queensland University of Technology
IEEE Transactions on Audio, Speech and Language Processing | Year: 2012

Human communication is more than just the transmission of information. It also involves complex interaction dynamics that reflect the roles and communication styles of the participants. A novel approach to studying human communication is to view conversation as a coupled time series and apply analysis techniques from dynamical systems to the recurring topics or concepts. In this paper, we define a set of metrics that enable quantification of the complex interaction dynamics visible in conceptual recurrence. These multi-participant recurrence (MPR) metrics can be seen as an extension of recurrence quantification analysis (RQA) into the symbolic domain. This technique can be used to monitor the state of a communication system and inform about interaction dynamics, including the level of topic consistency between participants; the timing of state changes for the participants as a result of changes in topic focus; and, patterns of topic proposal, reflection, and repetition. We demonstrate three use studies applying the new metrics to conversation transcripts from different genres to demonstrate their ability to characterize individual communication participants and intergroup communication patterns. © 2006-2012 IEEE. Source


Hao J.,Supelec | Qiu C.-W.,National University of Singapore | Qiu M.,Engineering School of Information Technology and Communication | Zouhdi S.,Supelec
Optics Letters | Year: 2012

In this Letter, we present a new type of ultrathin antireflection transparent and high-conductive screen based on plasmonic nanostructures that does not suffer from high loss and thickness coating and also can be used as good conductive material due to super electrical conductivity of the component (noble metal). Low reflection and greatly enhanced transmissions over a broad spectral range are observed at optical telecommunication frequencies in arbitrary polarizations. The performance is almost insensitive of the angle of incidence. © 2012 Optical Society of America. Source


Hossain M.S.,Engineering School of Information Technology and Communication | El Saddik A.,Engineering School of Information Technology and Communication
IEEE Transactions on Instrumentation and Measurement | Year: 2010

QoS guarantee is crucial for delivering real-time multimedia over any type of network. This paper proposes QoS-aware multimedia service selection in a heterogeneous network environment. The QoS-aware service selection is based on the nature-inspired routing algorithm, AntNet. The performance evaluation for this selection algorithm is conducted on the multimedia content transcoding system. This paper presents and evaluates a real implementation of an ant-inspired selection algorithm in the university network environment for choosing multimedia transcoding services. From the test results, it is observed that an ant-inspired service selection algorithm outperforms the traditional shortest-path selection algorithm in terms of transcoding delay. In addition, we also compare the proposed algorithm with other algorithms through simulation, measure the performance, and find that the proposed algorithm achieves better QoS assurance. © 2006 IEEE. Source


Li Q.,Engineering School of Information Technology and Communication | Song Y.,Engineering School of Information Technology and Communication | Zhou G.,Shanghai JiaoTong University | Su Y.,Shanghai JiaoTong University | Qiu M.,Engineering School of Information Technology and Communication
Optics Letters | Year: 2010

Asymmetric directional coupling between a hybrid plasmonic waveguide with subwavelength field confinement and a conventional dielectric waveguide is investigated. The proposed hybrid coupler features short coupling length, high coupling efficiency, high extinction ratio, and low insertion loss; it can also be integrated into a silicon-based platform. This coupler can be potentially adopted for signal routing between plasmonic waveguides and dielectric waveguides in photonic integrated circuits. Furthermore, it can be exploited to efficiently excite hybrid plasmonic modes with conventional dielectric modes. © 2010 Optical Society of America. Source


Tao Z.,Engineering School of Information Technology and Communication | Hong Y.,Engineering School of Information Technology and Communication | Luo B.,Beijing University of Posts and Telecommunications | Chen J.,Engineering School of Information Technology and Communication | Guo H.,Engineering School of Information Technology and Communication
Optics Letters | Year: 2015

We demonstrate an extended cavity Faraday laser system using an antireflection-coated laser diode as the gain medium and the isotope 87Rb Faraday anomalous dispersion optical filter (FADOF) as the frequency selective device. Using this method, the laser wavelength works stably at the highest transmission peak of the isotope 87Rb FADOF over the laser diode current from 55 to 140 mA and the temperature from 15°C to 35°C. Neither the current nor the temperature of the laser diode has significant influence on the output frequency. Compared with previous extended cavity laser systems operating at frequencies irrelevant to spectacular atomic transition lines, the laser system realized here provides a stable laser source with the frequency operating on atomic transitions for many practical applications. © 2015 Optical Society of America. Source

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