B2B systems are still in a state of flux. There are numerous techniques for implementation and even more approaches for theoretical debut and classification. Most of existing solutions have certain functional limitations, depending on market and industry they serve. This paper focuses on the horizontal network marketplaces, as a specific type of B2B systems. The possibilities for improving functionalities of B2B systems and removing limitation factors in development and use are discussed. It further presents existing wide spread solutions and limitations of Serbian market, as an example of environment with a low level of IT readiness. We designed and implemented B2B Web portal “Market4Net” which offers and illustrates possible improvements in the domain. This portal is intended for Serbian market and aims to overcome described difficulties. Our research mainly concentrates on development aspect of B2B, but also touches some issues related to collaboration management and trust building mechanisms.

The article deals with modeling of a system with hybrid dynamics and with two tools for modeling of such systems. For purpose of modeling we chose the system of coupled tanks. The tanks are situated in different heights and dynamics of the system changes in the moment when the liquid level in the second tank runs over the height of bottom of the first tank. That represents hybrid nature of this system. We chose two tools for simulation of hybrid systems – MPT toolbox and HYSDEL and we specifically aim on modeling of the system of coupled tanks by both these tools and on comparison of these tools. The tools are free however they do not work independently but as a part of the simulation language Matlab.

This article describes technological level of flexible manufacturing system (FMS) control. It focuses on the control in terms of sensors, actuators and technological networks. It also focuses on the control of manipulators that are part of FMS and are controllled via the network DeviceNet. Flexible manufacturing system (FMS) represents fully automated technological manufacturing process that is employed in teaching process. The principal aim is to improve the control system of a given model as well as higher levels of distributed control system (DCS) using the communication links between individual DCS levels.

At present the problematic of floods is larger than ever because global warming, deforestation and other factors increase chance of flood creation. As prevention to floods, designing of many new anti-floods projects have been started. In the future, these projects will stop floods completely or at least reduce their consequences. Water flow simulation and visualization is an integral part of this process. Simulation is used for testing, if the project meets flood protection requirements. Visualization is used for presenting and helps investors and wide public to better understand these projects. Stereoscopic visualization can be also used, because displaying of outputs from simulation and visualization is important, too. This paper aims at fluid flow simulation and visualization software. Also aims at hardware that can be used for stereoscopic visualization.

This paper presents a new approach for managing RDF repositories without necessary knowledge or experiences with RDF standard. The main differences between proposed solution and existing ones are adaptability on various semantic repositories, internal memory model for manipulation with RDF graphs and utilization of the Java annotations for mapping between ontology and java classes. Persistence API (P-API) represents Java library offered features for separation of business logic from RDF and allows simple integration of the semantic applications with selected RDF repository. The developers don’t need to work directly with RDF query languages; they work only with Java classes. The P-API can also help developers with manipulation within RDF graphs constructed from data stored in repository, as the proposed RDF Memory model fits perfectly with such purposes. This Memory model can be used for more complex and straightforward manipulation with ontological knowledge models. The P-API was designed and implemented as a supporting solution on the middleware layer of the collaborative system in order to make bilateral communication effective and faster. The exploitation within KP-Lab system is described in a section no.3 as an illustrative example for possible integration approach.

This paper introduces a solution to the reference trajectory tracking problem done by a differential wheeled mobile robot Khepera II. The paper includes a kinematic part and a dynamic part of the mathematical model of mobile robot. In this paper two approaches of the artificial intelligence are used i.e. genetic algorithm approach from evolutionary computing techniques and theory of neural networks. Genetic algorithm is used for parameters optimizing PID controller and K parameter so-called parameter speed of rotation at the tracking reference trajectory into defined control structure. For the creation forward and inverse neural model by the approach of neural networks are used forward neural networks of MLP type. The neural models are verified using Neural Network Toolbox. The forward neural model of the mobile robot is implemented into the IMC control structure together with the inverse neural model, which is used as a nonparametric neural controller. The purpose of the designed control structure is tracking the defined trajectory of the mobile robot using approaches of the artificial intelligence, which are verified by the simulations in the language Matlab/Simulink.

In this paper is presented the 3D model of Chua's circuit boundary surfaces. This represents the boundary between the two attractors - chaos and a stable limit cycle. In the first part is described short history of Chua’s circuit and sequential circuits boundary surface modelling and visualization. Second part describes 3D modeling of boundary surface. Three dimensional model of boundary surface is created by appropriate combination lot of 2D cross-sections in surface u1=const using triangulation. The modelling and visualization of boundary surface represents modelling and visualization of large graphical data set and is timeconsuming process.

In this paper, a subband coding system consisting a combination of analysis filter bank, vector quantizer and trellis coding is designed. For the analysis filter bank, which decompose an input signal spectrum to bands we used a design method of cosine modulated filter bank with the perfect reconstruction. The analysis filters are obtained by cosine modulation of a prototype filter with the transfer function H(z), which optimization is performed right through the two-channel lossless lattice structure. Next block in this coding system is the vector quantizer with a full search, which perform quantization in the subband domain. The final block of the designed subband coding system is the block of trellis coding. This uses a block structured codebook of the vector quantizer with an extended set of the quantization vectors in accordance with Ungerboeck’s theory of clustering the set.

Nowadays Human-Computer Interfaces (HCI) are widely studied and became one of the major interests among scientific community. Due to last decades progresses in the field of speech technologies, like Automatic Speech Recognition (ASR) and Text-To-Speech synthesis (TTS) and in the field of Natural Language Processing (NLP), voice enabled interfaces and spoken dialogue systems are hopefully going to became more and more common.
A dialogue management system is a system for managing the interactions between a person and a computer in a conversational interface. Spoken dialogue systems can be classified in to three main types, according to the methods used to control the dialogue with user: finite state-based systems, frame-based systems and agent-based systems. This paper describes basic principles of these methods and their application in dialogue systems as well as dialogue management techniques which have been developed for spoken dialogue systems and methods that have been adopted in some well-know dialogue systems.

Domain-specific languages are used to develop highly specialized software. From the implementation perspective, evolution of such software can not utilize evolutionary methods used for software developed in a traditional way. This paper presents the model of evolution, considering the software system as a composition of two separate parts – domain-specific language reflecting the application environment and system by itself reflecting the actual solution to a specified problem. The process of evolution is driven in accordance to the nature of evolutionary change. The paper also discusses the categorization of changes by cause which induced them.

This paper presents recent advances in applying parallel synchronous PSO algorithms for Optimal Power Flow in Combined Economic Emission Dispatch environment of thermal units while satisfying the constraints such as generator capacity limits, power balance and line flow limits. The use of orthogonal polynomials will give a very convenient means to obtain the equivalent cost function of the generating units. A general formulation and the development of Cascade Correlation algorithm to solve the environmentally constrained dispatch problem are presented. The objective is the minimization of the cost of operation, subject to all the usual and emissions constraints. The results obtained by the proposed method are better than any other evolutionary computation techniques proposed so far.