 |
The Seventh International Conference on Advanced Engineering Computing and Applications in Sciences ADVCOMP 2013 |
| Tutorials |
T1. Modeling and Analysing Large-Scale Dynamic Social Networks
by Rui Sarmento,
João Gama, and
Márcia Oliveira
LIAAD/INESC TEC, Portugal
T2. Optical Fibers: How Physical Impairments Limit the Transmission Capacity – Fundamental Concepts and the State of Art
by Prof. Dr. Antonio Sachs - University of São Paulo, Brazil
DETAILS
T1. Modeling and Analysing Large-Scale Dynamic Social Networks
by Rui Sarmento,
João Gama, and
Márcia Oliveira
LIAAD/INESC TEC, Portugal
We are in the era of Big Data. The democratization of the Internet, exacerbated by the dissemination of mobile devices, is changing the way how people express opinions, communicate with others and, mostly important, how people relate with others. The objective of this tutorial is to provide an intuitive and concise overview of the most important theoretical models, methods and techniques to understand the dynamics of social networks, as well as introduce available efficient tools to explore large-scale networks.
This three-hour tutorial is organized in three separate but complementary parts. The first part gives an overview of social network analysis with a particular emphasis on basic concepts and tasks. The second part will shift the focus from static to dynamic social networks. The last part of the tutorial deals with distributed software tools for exploring very large social networks. The application of these algorithms to real-world networks will also be presented and explained.
The goal of the tutorial is to encourage the audience to initiate their own research in the burgeoning field of large-scale dynamic network analysis, by stimulating and facilitating future work.
Tutorial Outline:
Part 1: Overview of Social Network Analysis (João Gama)
Part 2: Analysis of Dynamic Social Networks (Márcia Oliveira)
Part 3: Mining Large-Scale Social Networks (Rui Sarmento)
Target Audience and Prerequisites:
This tutorial aims at presenting recent advances in the emergent field of largescale evolving social network analysis to researchers, graduate students and practitioners who are interested in tapping the potential of complex, dynamic and very large networks. The tutorial is intended to be self-contained, thus not requiring prior knowledge on the field. Nevertheless, it will be assumed that attendants are comfortable with basic concepts from probability theory, statistics and mathematics.
T2. Optical Fibers: How Physical Impairments Limit the Transmission Capacity – Fundamental Concepts and the State of Art
by Prof. Dr. Antonio Sachs - University of São Paulo, Brazil
The high transmission capacity of the optical systems is limited by the physical impairments. The causes of limitations are well understood and are related to the attenuation, to the dispersion phenomena as well as to non linear effects. From 2001 to 2007 the highest transmission capacity of a single fiber, obtained in practical trials, looked like to be stabilized around of 1Tbps (one terabit per second). This value was obtained after implementation of wavelength division multiplexing technology (WDM) and also after the development of broadband optical amplifiers that enable better efficiency in the use of the available bandwidth. Nevertheless, this capacity was far smaller than 55Tbps, theoretical perspective based on the available 55THz bandwidth ( from 1300nm up to 1700nm). Indeed, the spectral efficiency was much less than one bit per second per Hertz (1b/s/Hz). After 2007 the high effort on the spectral efficiency improvement, as well as the efforts on all kinds of noise mitigation, enabled the jump of the spectral efficiency up to 90b/s/Hz and the jump of transmission capacity in a single fiber up to 1 Pbps (one petabit per second).
In this tutorial, it is made a revision of the physical impairments, including the fundamental concepts of the attenuation, the chromatic dispersion, the polarization mode dispersion and the non linear effects. Types of fibers and connectors are shown as illustration. The capacity limitation is understood from the physical impairments and the multilevel modulation systems are introduced as a solution for the spectral efficiency improvement. Trial examples and updated standardization are presented as the stat of art on the fiber capacity.
In summary, the proposal consists in a three hours tutorial including videos and material illustrations with the following:
I. Physical Impairments Overview
a. Attenuation (fibers; passive components)
b. Dispersion (chromatic dispersion; polarization mode dispersion)
c. Non Linear Effects (parametric non linear effects; non linear scatterings)
II. Transmission Capacity
a. Transmission and Reception Characteristics (external modulation; sensibility; quantum Limit)
b. Bit Rate versus Distance
c. Optical Amplifier; Dispersion Management; WDM
d. Available spectral bandwidth
III. Multiplexing and Modulation Techniques
a. TDM and WDM
b. Spectral Efficiency, OFDM
c. mOOK, mPSK, mQAM
d. Coherent Reception
e. Noise Mitigation and Shannon Capacity
f. Last trick: SDM
IV. Stat of Art
a. Standardization: IEEE 802.3ba, IETF, ITU-T, IOF
b. Long Distance Trial, ECOC, OFC-NFOEC
c. Short Distance Systems
d. Commercial Systems
