Abstract
In experimental peripheral nerve studies, the rat sciatic nerve model is widely used to examine functional outcome following nerve injury and repair. A variety of evaluation methods exist in the literature, but an adequate selection continues to be a critical point for the researcher. Rats with sciatic nerve injury typically ambulate with an external rotation of the foot. A new functional assessment instrument, the toe out angle (TOA) is quantified using computerized gait analysis. We compared Sciatic Functional Index (SFI) with TOA parameter after peripheral nerve transection and entubulation repair. We found a good correlation between SFI and TOA measurements in terms of predicting functional recovery. Moreover, the TOA provides information on the biomechanical consequences of the external rotation of the foot in the stance phase of walking.

Abstract
In this paper wastewater treatment processes in fixed-bed bioreactor are examined. One possible way to acquire more precise description of such processes is their real consideration as objects with distributed parameters. In order to avoid the complexity of mathematical description of distributed parameters objects, some new methods have to be applied. In this paper a new approach for description of wastewater treatment processes, based on the apparatus of Generalized Nets and Intuitionistic Fuzzy Logic, is presented. As a result from applied techniques, different decisions could be made about the variation of the number of levels in biofilter and about optimal carrying out of the processes in the meaning of technological time and quality of outlet water.

Abstract
A new approach for modelling of Escherichia coli cultivation process, based on the apparatus of Generalized Nets, is presented in this paper. Generalized Nets provide the opportunity to describe the logic of the cultivation process modelling. Developed Generalized Net model gives a possibility to change the concentration of feeding solution in dependence of substrate concentration in the fermenter in order to prevent the inhibition effect. Moreover, proposed Generalized Nets model allows to control the concentration of dissolved oxygen at some desired value, changing the aeration rate in dependence on concentration of dissolved oxygen during the process. The opportunities, which obtained Generalized Net model gives for process optimization, affirm the apparatus of Generalized Nets as very efficient tool for modelling of fermentation processes.

Abstract
In the present article we model the treatment of mechanically ventilated patients with nosocomial pneumonia using a generalized net. The model can be used by clinicians for diagnosis and clinical and microbiological follow-up of nosocomial pneumonia, to the decision to change the ventilator regime, to begin weaning from mechanical ventilation, or to stop the weaning trials.

Abstract
The lack of dynamic double-side regulation models for E-Marketplaces is a main reason for their lack of success as advanced open trading places.In this paper, a new model - DYNEX - is developed to generate homogeneous markets of goods or services and to optimize for each homogeneous market the trading price and the negotiation process between buyers and sellers.

Abstract
As new standards for technology specifications related to XML are unveiled, and stable tools to implement them become available, the widespread usage of XML as an universal format for data exchange between heterogeneous systems (using the Internet), will increasingly become a reality. Therefore, in order to deal efficiently with the large amounts of XML data that will be generated in the near future it is imperative to find efficient alternatives for the storage and management of this special kind of data. For that matter, object-oriented databases seem to be a good alternative. In this paper, we begin with an analysis of the different alternatives available to store and manage XML data. After that, we concentrate our attention on the Object-Oriented (OO) database approach and, in that context, we present a first set of rules that allow the translation from a simple database schema specified in ODL (Object Definition Language) into a schema specified in XML-SCHEMA. In the near future we intend not only to expand this set with new rules that will handle other, more complex, OO modeling constructs, but also to create another set Of transformation rules to work the other way round (i. e. from XML-SCHEMA to ODL). Our aim is to cover all the possible modeling situations one may come across in OO database schemas specified in ODL.