Dataflow architectures can be used advantageously for computation-oriented applications that exhibit a fine grain parallelism. The implementation of the dataflow computer architecture depends on the form of execution of the dataflow program instructions, which is implemented as a process of receiving, processing and transmission of data tokens. The architecture described in this paper belongs to a class of dynamic dataflow architectures with direct operand matching. The concept of direct operand matching represents the elimination of the costly process (in terms of computing time) related to associative searching of the operands. This process is associated with the processing units of the proposed system. The processing units are designed as a dynamic multifunction pipelined unit of five segments, Load-Fetch-Operate-Matching-Copy. This pipeline stages handle processing of operand matching of dataflow operators. From the many types of operators, this paper describes microprogram managing for double input operators.

In this paper we present some of the drawbacks of World Wide Web connected with increasing amounts of information published in it and propose solutions such as semantic metadata, personalization and trust metrics. Greater emphasis is given to trust metrics as it is subject of our current research. Several definitions and graph formalization are discussed as well as approaches to determining values of direct and indirect (transitive) trust. In the end need for more systematization is stressed along with discussion of some transitive trust issues.

Wireless Sensor Network (WSN) technology has become the key technology to all innovative and novel wireless applications because of its low cost and deployment simplicity. This paper presents a low cost ZigBee based WSN implementation for indoor position monitoring in a home automation application. The real-time knowledge of the location of personnel, assets, and portable instruments can increase home automation control efficiency. Position monitoring otherwise called as location estimation is the process of obtaining location information of a node with respect to a set of known reference positions. Different radio propagation models and localization techniques are discussed. Low cost Digi XBee PRO modules are deployed for location estimation using trilateration method inside a home and mean displacement error value is reported for the same. The application programs have been developed in python language using simple AT commands. The hardware and software framework and related programming are discussed in this paper.

The proposed paper describes the principles of construction of an electromagnetic diamond percussion tool used for stone engraving. The tool foundation is an electrically driven pointed diamond engraving by hammering on solid, polished surfaces. The paper includes measurements of tool prototype, describing its basic features and potential applications. Finally, the tool performance is tested on a sample image engraved into polished black granite.

Configuration is an important part of design of software systems. There are many different configuration formats, such as XML, YAML, attribute-oriented programming, etc., that allow system provider to design configuration language according to his requirements. Target group of system users is often very wide and one configuration language can not meet all user requirements. The paper introduces and analyzes idea of supporting multiple configuration sources using common abstraction of configuration sources in order to meet more user requirements without severe increase of provider’s costs. The paper presents design of tool providing common abstraction of configuration sources. Design is based on analysis of existing tools, and it is extended with idea of declarative representation of mapping of configuration languages to output format and of process of their combining. At last, the paper presents proof-of-concept implementation of the tool called Bridge To Equalia and states several conclusions based on experiments realized with Bridge To Equalia.

This article describes a developed real-time traffic sign recognition system (TSR) along with the algorithm to get a position of recognized traffic sign in order to store both the recognized traffic sign and its calculated approximate GPS position to a database. Such database can be used for example in navigation systems for finding route according to the restrictions on the roads given by traffic signs, or for local authorities to register traffic signs in a region.

In this paper we describe a unique way for developing open source systems expertise that was gained by students in national and international teams. All activities are performed in context of Erasmus Intensive Programme project named “Developing open source system expertise in Europe”. Altogether 70 students from 7 European countries work during one semester on different projects, focused on various open source systems. Project topics range from network management solutions, via enterprise content management, business process management, image recognition, to voting systems with mobile clients – to mention at least some of them. All seven participating universities bring together their knowledge and experience in specific open source systems and transfer them into 7 projects. Each project solution consists of the analysis and design phase that is carried out by national teams at home universities and the implementation phase that is carried out by international teams during the two-week intensive course.

Searching an information is essential part of the Internet today. There are many algorithms and methods for effective web search engines, where the results are more or less relevant. Web pages for better visibility and usability use SEO techniques which improve final query results. The result of this work is full-text web search engine for images and texts. Aim of this work is to make introduction to knowledge of the web search engines and provide own design of web search indexing architecture which will be used for futher educational process.

The paper deals with the design of a new hybrid RISC computer architecture, with the computation driven by a Petri net. A class of Petri nets, suitable for the purpose is proposed within the paper, based on Colored Petri nets. The design of the architecture follows - structure and memory organization, control unit and processing elements. The architecture is implemented using emuStudio emulation platform and its operation is demonstrated by an example at the end of the paper.

This paper presents a simplified control scheme for three-phase three-level series active power filter to compensate all load voltage perturbations such us harmonic unbalances, sags and swells. The standard configuration of three-phase series active power filter uses the two-level three-phase voltage source inverter with hysteresis controller. This configuration presents some drawbacks and is limited to low power systems. Today three-level (NPC) inverter is one of the most successfully employed topology in various industrial applications. In this paper a new scheme to increase the capability of series Active Power Filter (APF) voltage controller based on three-level inverter using simplified Pulse Width Modulation (PWM), is proposed. The control strategy adopted use instantaneous reactive power theory, easy to implement and gives good performance for all load voltage perturbations. The numerical simulation results carried with MATLAB-Simulink and SimPowerSystem Toolbox show the effectiveness of the proposed control scheme.

In the paper a chance constrained linear programming problem is considered in the case of join chance constraints with random both left and right hand sides. It is assumed that due to its complex stochastic nature the problem cannot be reduced to any equivalent deterministic problem. In such a case a Monte Carlo method combined with Global Optimization (GO) algorithms are proposed to solve the problem. A performance of various types of GO algorithms as tools for solving such problems are compared via computer simulations. The simulation results are presented and discussed in the paper.

The paper deals with stiff systems of differential equations. To solve this sort of system numerically is a difficult task. There are many (implicit) methods for solving stiff systems of ordinary differential equations (ODE’s), from the most simple such as implicit Euler method to more sophisticated (implicit Runge-Kutta methods) and finally the general linear methods. The mathematical formulation of the methods often looks clear, however the implicit nature of those methods implies several implementation problems. Usually a quite complicated auxiliary system of equations has to be solved in each step. These facts lead to immense amount of work to be done in each step of the computation. These are the reasons why one has to think twice before using the stiff solver and to decide between the stiff and non-stiff solver. On the other hand a very interesting and promising numerical method of solving systems of ordinary differential equations based on Taylor series has appeared. The potential of the Taylor series has been exposed by many practical experiments and a way of detection and solution of large systems of ordinary differential equations has been found.