ISSN 1312-2622

YEAR VI No. 2 / 2008

CONTENTS
Cooperative Localization by Time-Of-Flight Trilateration – Fast, Robust or Optimal
Design of Meta Database Model and Universal Business Applications
Analytical Methods and Algorithm of Decision LWR- model of Traffic Flow in a Class of Distributed Parameters Systems
Earth Observation Software System for Fire Monitoring
Implementation of a Parallel Architecture for Radix-2 Fast Fourier Transform

 

Cooperative Localization by Time-Of-Flight Trilateration – Fast, Robust or Optimal
Svetoslav Genchev
Key Words:
Absolute positioning, Trilateration, Cooperative robotics, Numerical Optimization.
Abstract
This paper presents several novel trilateration methodologies for localization in teams of cooperative robots, based on Time-Of-Flight (ToF) measurements between the robots. One real-time, low-computation technique and another two optimal, computation costly models are introduced, compared and analysed. All methods and theirs statistical characteristics have been presented analytically, and compared numerically by graphical simulations.

Design of Meta Database Model and Universal Business Applications
A. Murdjeva, M. Tsaneva
Key Words:
Data base design; business logic; abstract design; universal application.
Abstract
Nowadays the activities automation in a specific business area is not technological news, but a business need. The necessity of more and more business applications implies the quest for tools and techniques for fast and efficient development of information systems. Rapidity and efficiency are two important directions, in which business application development technologies are developing today, aiming at these two important qualities being achieved regarding both development process stages and system exploitation. The effective exploitation is related to real usage of the information system. And this is available when information decision follows the pace, in which processes in the business area develop. The achievement of this aim is a new challenge to the technologies. In this paper, some ideas are presented about changing the patterns of database design, directed to produce applications which are maximum adaptive and scalable.

Analytical Methods and Algorithm of Decision LWR- model of Traffic Flow in a Class of Distributed Parameters Systems
M. Uzunova, D. Jolly, E. Nikolov
Key Words:
Analytical solution for the PDE; Green function; distributed parameters systems.
Abstract
The Web service examples depending on the usage of the UDDI are presented. Development of an application, which provides access to various Web Service resource definitions, based on the UDDI registry, is explained and presented. The main aim on this article is through the analytical methods, of partial differential equation P.D.E. resolution, to obtain an exact solution for the PDE presenting the LWR [Lighthill et Whitham, 1955] et [Richards, 1956] traffic flow model and farther to obtain the transfer function of this distributed plant. This model demonstrates the distribution of vehicles on the highs ways and presents the traffic flow as a distributed parameter system D.P.S. The LWR model is a part of the macroscopic traffic flow models based on the fluid mechanics, where the physical model is presenting by a non-linear hyperbolic (or quasi-linear) PDE. The different analytical methods of solution are shown, some of them approximate (wildly used classical methods of solution) and some of them giving an exact solution called the Green function method (integral kernel method). This analytical method of exact solution of the PDE use this Green function as an integral kernel changing the differentials equations in algebraic equations translating the phenomenon of the distribution of vehicles on the high ways. Using this exact method we obtain directly the plant transfer function for the traffic flow model viewed as a DPS. The validation of all obtaining results is made by the comparison analysis with the wildly used numerical solution.

Earth Observation Software System for Fire Monitoring
M. Lazarova, B. Miloshevska, D. Ivanova, Y. Pavlov, M. Damyanov
Key Words:
Remote sensing; fire detection and monitoring; MODIS, multitemporal analysis; burn area.
Abstract
The paper presents fire detection and monitoring software system based on satellite data acquired by remote sensing of the Earth. Fire detection is based on data downloaded by MODIS Rapid Response System and uses contextual detection algorithm. The system provides visual localization of the detected fires as well as sound alarm, e-mail and sms alert. Multitemporal analyses are utilized for monitoring the dynamics of the fire front. Deforestation resulting of the fire burn area is estimated using NDVI multitemporal comparison. A history of the detected fires as well as information about date/time of the fire occurrence and localizations is also provided for the purposes of fire pattern analysis.

Implementation of a Parallel Architecture for Radix-2 Fast Fourier Transform
Ph. Philipov, I. Costov, V. Lazarov, Z. Zlatev, M. Ivanova
Key Words:
Parallel Fast Fourier Transform; high-performance computer architectures.
Abstract
This paper describes the main problems, connected with realization of the Fast Fourier Transform (FFT) algorithm on a radix-2 parallel architecture, suitable for implementation on field programmable gate arrays (FPGA) and based on the perfect shuffle interconnection pattern. Performance estimation and resource utilization analisis are presented. The main advantages and possible applications of the proposed architecture are outlined.

The John Atanasoff Society of Automatics and Informatics

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