(MMACTEE 05)
  • The 4th WSEAS International Conference on NON-LINEAR ANALYSIS, NON-LINEAR SYSTEMS and CHAOS (NOLASC 05)
  • And the  5th WSEAS International Conference on WAVELET ANALYSIS and MULTIRATE SYSTEMS (WAMUS 05) were held in Sofia (Bulgaria) from October 27 2 till October 29, 2005



Photo with the Organizers in foreground: Prof. V.Mladenov (Technical University of Sofia),
Prof. A. Slavova (Technical University of Sofia),  Prof. N.Bardis (Hellenic Army Academy, Greece)

Over than 100 participants from all over the world attended these conferences.
The Opening of the Conferences was really very good.

Keynote Speakers

Professor Valeri Mladenov
Technical University of Sofia, Bulgaria

Prof. Mladenov presenting his Keynote Speech: "On the Solitary and Periodic Waves in Cellular
Neural Networks based on simple cells"


Professor Angela Slavova
Bulgarian Academy of Sciences, Bulgaria

Prof. Slavova presenting her Keynote Speech: "Receptor-Based Cellular Neural Network Models"
(Abstract: In this lecture, a receptor-based Cellular Neural Network model is considered.
Dynamics and stability of such model are studied by applying describing function technique.
Comparison of the obtained results with the classical ones is made as well)

Professor Leon Chua
University of California at Berkeley, USA

Professor Rossella Cancelliere

University of Torino, Italy

Prof. A. Adamopoulos presenting his Invited Lecture

Many parallel sessions with important contributions from invited authors took place along with several discussions.


There existed Student Competition and the Prizes for the Best Students' papers were given after  the conference.  

On the other hand, the authors of the best of the accepted papers received an invitation for
sending an extended version
to the WSEAS reputable International Journals.

The conferences were held in a 4-Star Hotel in Sofia where the WSEAS participants had
discount rates in the room prices.

Sofia, Bulgaria:
Sofia has a history that goes back thousands of years. Through the centuries, many peoples have inhabited it and added to its rich and diverse history. Numerous Neolithic villages have been discovered in the area, while a chalco-lithic settlement has been recently discovered in the very center of modern Sofia.  The Thracian Serdi tribe settled here in the 7th century BC and gave the first recorded name of Sofia -- Serdica. The Byzantines called it Triaditsa and the Slavs - Sredets. The modern city of Sofia was named in the 14th century after the basilica St. Sofia. In Greek, word sofia means wisdom. In the 3rd century AD, the Romans built strong walls around Serdica, their capital of Inner Dacia and an important stopping point on the Roman road from Naisus (present Nish, Yugoslavia) to Constantinople. Today there are many archaeological sites in Sofia, that display the city's diverse history - the castle gates and towers of Serdica, public buildings and streets thousands of years old. A large part of the ancient city of Serdica is underneath important modern buildings. The ancient city council (bulefteris) is hidden under the "Sheraton" hotel, while a number of basilicas are below the National Historical Museum. The Roman thermal baths are under the Sofia Mineral Baths and a Roman residence with elaborate mosaics is below the "Rila" hotel. After the Hun invasion of 441, the town was rebuilt by the Byzantines. The Slavs gave Sredets a key role in the First Bulgarian Empire, then in 1018 the Byzantines retook Triaditsa. At the end of the 12th century, the Bulgarians returned and Sredets became a major trading center of the Second Bulgarian Empire. The Turks captured Sofia in 1382 and made it the center of the Rumelian beylerbeyship. The city declined during the feudal unrest of the 19th century, but with the establishment of the Third Bulgarian Empire in 1879, Sofia once again became the capital of Bulgaria. The National Art Gallery Rapidly the city's image changed from an Oriental, to a European. Today many streets, buildings, parks, and even whole neighborhoods preserve the architectural style from the turn of the century. Between 1879 and 1939, the population of Sofia grew from 20 000 to 300 000, while today 1 250 000 people live in Sofia.

Conference Statistics:
Submitted papers:
Accepted papers:
from these 137 papers, the WSEAS Committee approved additional Journal Publication for the
best papers of the conferences.

Review Process: Each paper was reviewed at least by 3 independent reviewers. The WSEAS Secretariat sent each paper to 5 reviewers. Some papers received review from 5 different referees. The WSEAS Secretariat had forwarded to the responsible for the correspondence author these comments by personalized emails. The full list of the reviewers will be available in the web page:

Only authors of those papers, which are found to have very positive response from 3 referees and which are modified satisfactorily to take into account all the comments of (at least 3)  referees of the conference are invited to send an extended version in the WSEAS Journals (WSEAS Transactions). The extended version is checked again by two additional referees and a rejection or acceptance is notified to the authors. WSEAS Organizing Committee therefore congratulates those, who have been able to get the distinction of having their paper published in the Transactions.

WSEAS sent a full report of the whole review process and the whole correspondence
to the following international indexes that have recognized officially the Validity and the Reputation
of the WSEAS Conferences:

* AMS (American Mathematical Soceity),
* Mathematical Reviews,
* CSA,
* ELP,
* NLG,
* Engineering Index,
* Directory of Published Proceedings,
* British Library,
* Swets Information Services

The Organizing Committee received the forms that the Session Chairmen filled in after the end of their Sessions and after additional evaluation and discussion decided the following (November 24, 2005). The Criteria were
a) originality and scientific impact
b) good presentation
c) the author that presented the paper to be a student
d) the paper to be written only by one or two authors.

So, the results of this evaluation is:

The Best Student Paper Aw
ard for t
was given to Vitaly Spitsa for his paper:
Root Clustering Method for a Small-Signal Stability Analysis of Power Systems
[Authors: V. Spitsa, A. Alexandrovitz, E. Zeheb]

The Best Student Paper Award for the WAVELET ANALYSIS and MULTIRATE SYSTEMS (WAMUS'05)
was given to Farzan Rashidi for his paper:
Split Step Wavelet Galerkin Method based on Parabolic Equation Model for Solving Underwater Wave Propagation
[Authors: M. B. Paskyabi, F. Rashidi]

The Best Student Paper Award for the
was given to Riccardo Russo for his paper:
Complex Dynamic Behavior of a CNN Hardware System by an Experimental and Numerical Analysis
[Authors: R. Russo, V. Bonaiuto, A. Salvini]

1. Coffee-Breaks: The WSEAS Organizing Committee offered 6 very rich coffee-breaks.
Each coffee-breaks were composed by coffee, tea,  juices, biscuits, freshly baked pastries.
During the Coffee-Breaks the attendees had several opportunities for to interchange ideas
and proposals for common projects and collaboration.

2. Banquet.
The night started with a variety of food and bulgarian special delicacies

After a wonderful dinner, we had the pleasure to enjoy a genuine Bulgarian Night with typical
Bulgarian Music and
typical Bulgarian Dances that reflect the long history of this wonderful balkan nation.
The Bulgarian folklore dances are really impressive (see photos below) and the ballet was
composed by 9 members:  4 professional dancers,  3  musicians and 2 singers.
After their dance, they invited all the WSEAS participants to learn together the epic dances of
Bulgaria, Hemos Mountains and Black Sea.
After that, each of our participants danced with us
in a wonderful unforgettable night of October 28.
The Banquet  was really excellent.

Wonderful Traditional Music with Memories from Hemos Mountains, Black Sea.
It is true that the music of each nation contains its character, its history and its attempts for liberty and
independency mixed with a passion for live, love and peace.

The Conference Participants learn the Bulgarian Dances with success

Happy moments in the Banquet after a successful scientific day

The overall impression of the meeting was excellent. WSEAS Administrative Council thank each of you for increasing the WSEAS Reputation by these wonderful and important meetings.
See also: