The aim of this paper is to analyze the dynamic process of agent negotiation within a supply chain management. To solve the declared problem, some methods to perform negotiation are proposed. Agents will be able to flexibly choose strategies while negotiating. Both of the own and global criteria are included within agent deliberation. A model of the negotiation of 3 agents, which has been developed on the basis of the discussed theories, is presented. The model is applicable for SME (Small and Medium Enterprises) and other applications, where negotiation is necessary, and/or useful.

There are a growing number of e-Government portals and solutions available today. But what the users lack in particular is a customized assistance – help that meets the individual situation and competence [15]. In this paper, a system called Webocrat will be presented as an attempt to shift e-Government portals toward this direction, providing various knowledge technologies as its core components [13]. 
The Webocrat system applies a knowledge-based approach [6]. Information of all kinds produced by various modules is linked to a shared ontology representing an application domain. Such ontology serves as a mean for structuring and organizing available information resulting in improved search capability and contents presentation. Moreover, this approach is utilized also e.g. for support of personalization, when each user may define her/his area of interest by means of concepts from the knowledge model and be automatically notified about new information in the system relevant to her/his profile.
Finally, knowledge discovery techniques [11] applied on text information available within the portal are used for automatic annotation of new sources.

In this article we compare the throughput performance of selected modified and adaptive Go-Back-N schemes using quadrature amplitude modulation (QAM) in radio channel conditions. Simulations were done in the condition of Rayleigh fading channels. The results are shown in enclosed graphs.

Geographical data processing using Geographical Information Systems on single processor computer is going to be very difficult in consideration of constantly growing amount of data. In the recent years there is a trend of operation of these systems on parallel computers, which brings an effect mainly in the area of their performance. This article deals with possibilities of shortening of time demanded for mathematically exacting process of both analysis and visualization of variety of a geographical data using parallel architectures. It focuses on some methods of geographical data processing as well as on types of parallel computing systems, together with description of their practical application to the environment of Geographical Information Systems.

The subject matter of this paper deals with the improvement of different ways of evaluating of the results obtained during measurements of partial discharges (PDs) using the acoustic emission method (AE). The detailed subject matter of the paper refers to the use of mathematical statistics in the analysis of AE signals generated by PDs. 
The results presented are connected with repeatability tests on the selected descriptors which make the identification of basic PD forms possible.

Magnetohydrodynamic feeders of molten metals represent important devices for accurate dosing of conductive material. Design of these relatively expensive devices has to be based on reliable numerical models. Simulation of their behaviour in various operational regimes (heating, pumping) represents a complicated coupled task characterised by interaction of nonstationary electromagnetic, temperature and flow fields. Sometimes, however, their operation can be studied by means of the equivalent circuit representation. The paper deals with finding parameters of this circuit and their dependence on selected geometrical dimensions of the electrodynamic feeder for liquid zinc. The analysis is supplemented with an illustrative example and discussion of the results.

This paper deals with the perspectives and implementation of dynamic security assessment in the open market environment. Traditionally, preventive and corrective dynamic security measures have been developed from numerous off-line simulations. Recently, on-line security assessment tools have been developed a few of which have found their way to real system implementation. These tools differ in the methodology but they share the same concepts and fundamental blocks. This paper describes on-line dynamic security assessment methods as a part of the remedial stability control determination.