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Dhaka P.,University of Delhi | Johari R.,Engineering School of Information Technology and Communication
Proceeding - IEEE International Conference on Computing, Communication and Automation, ICCCA 2016 | Year: 2016

In today's world Cyber Crimes are happening at a very rapid rate, the tools and techniques required to handle bulky and complex cyber crimes and attacks, are making organisations to remain coherent with evolving threats. Big data analytics provides a better and focussed way to overcome these threats and shorten their time to remediate with the help of tools like MongoDB. While the crime complete impairment are still unexplored there is need to control this damage by analysing the fast investigation using Big Data tools. This paper puts forth the ideas and strategies of using the cyber crime investigation tool to analyse the data and generate a report and deploying this data in MongoDB in order to manage large data and extracting structured data sets that it could help us to better understand and analyzed how to ensure threats from recurring. © 2016 IEEE.


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.


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.


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.


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.


Song Y.,Engineering School of Information Technology and Communication | Wang J.,Engineering School of Information Technology and Communication | Li Q.,Engineering School of Information Technology and Communication | Yan M.,Engineering School of Information Technology and Communication | Qiu M.,Engineering School of Information Technology and Communication
Optics Express | Year: 2010

Efficient broadband coupling of light between a dielectric waveguide and a hybrid plasmonic waveguide is investigated theoretically. A plasmonic linear taper is used as a coupler which connects the two types of waveguides. Broadband coupling is realized by such a compact plasmonic taper with a length of only 0.4μm, which achieves a coupling efficiency of 70% (1.5dB) at the 1.55μm telecommunication wavelength. © 2010 Optical Society of America.


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.


Zhang J.,Engineering School of Information Technology and Communication
Proceedings - IEEE INFOCOM | Year: 2016

Most of today's data center applications are sensitive to latency. In this paper, a Deadline-aware bandwidth Sharing mechanism by Allocating switch Buffer (DSAB) is proposed to satisfy the deadline requirements of flows. As the existing work SAB does, DSAB also leverages the feature that the buffer size of a switch port is usually much larger than the product of bandwidth and round trip delay in data center networks. The basic idea of DSAB is to allocate switch buffer to deadline-sensitive flows in priority and the remaining buffer is fairly allocated to background flows. However, this method will possibly lead to bandwidth wastage in topologies with multiple bottlenecks. Therefore, enlightened by the pre-authorization method in credit card systems, we propose a Pre-Authorization (PA) algorithm to address this problem. The PA algorithm allows switches take back the extra allocated bandwidth by adding a bandwidth confirmation phase after the bandwidth request phase. End hosts and switch functions of DSAB is implemented in Linux kernel and NetFPGA platform, respectively. The results of experiments conducted in a real small testbed indicate that DSAB can indeed satisfy the deadline requirements of deadline-sensitive flows by allocating switch buffer to them in priority. © 2016 IEEE.


Song Y.,Engineering School of Information Technology and Communication | Wang J.,Engineering School of Information Technology and Communication | Yan M.,Engineering School of Information Technology and Communication | Qiu M.,Engineering School of Information Technology and Communication
Journal of Optics | Year: 2011

Optical nanodisk resonators based on a hybrid plasmonic waveguiding geometry are investigated theoretically in the wavelength range of 1200-2000nm with their radii varying from 320 to 1000nm. Due to the fact that a hybrid plasmonic structure can efficiently confine light in a deep-subwavelength mode volume with a relatively low propagation loss, the nanodisks designed exhibit simultaneously a high Q factor and a high Purcell factor. For a hybrid plasmonic nanodisk with the radius of 1000nm, a Q factor of 819 and a Purcell factor of 1827 are achieved at the telecommunication wavelength of 1558nm. © 2011 IOP Publishing Ltd.


Ben Yahia N.,Engineering School of Information Technology and Communication | Jemni M.,Engineering School of Information Technology and Communication
2013 International Conference on Electrical Engineering and Software Applications, ICEESA 2013 | Year: 2013

This paper proposes an interactive manipulation of signing avatar (complex human's figures) by means of a descriptive sign language. The objective is to improve the human-computer communication, to generate precise signs for Deaf community, to control and animate the virtual character. This approach has been developed to manipulate robots through several analytic and numerical resolution methods. These methods have been applied to the virtual character for better monitoring and to ensure a realistic animation in real time. © 2013 IEEE.

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