In today's world, big companies, small business and even a single man to maintain his position need to use informatics systems effectively. The success depends on effectiveness and reliability of used systems and organization that uses them. Every organization can posses informatics system in two different ways: by creating the system from beginning or by buying one. In both cases there's no chance of success without user. The user contribution is different in each phases of development, nevertheless its good to make user participating in the process from the beginning. In this paper I assume that defining users informatics needs and creating logic model are the phases of analysis of informatics system. Result of mine analysis is identification of users informatics needs in following structures: - functional - function and purpose of the system, its connection with other systems - informative - input and output data and relation between them - technical - software and hardware Analysis is a necessary stage of creation of Informatics Systems of Management, deciding of correctness of future system. In my paper I will show: 1. Methods and purpose of analysis of informatics system. 2. Structural techniques of modeling informatics system in aspect of: - analysis of informatics' needs of users, - modeling system functions, - modeling system processes, - modeling data. 3. Results of using structuring analysis techniques Every system need to be analyzed during design phase. Success of analysis depends on following elements: - participation of competent people, - complete recognition of users needs, finding situation strange and atypical, - use of established standards and notation in specification of system model, - correctness check of the model by users of the system Analysis is source of 56% of all errors in informatics systems which create 82% of all errors costs. These facts force programmers and users to intensive work on improving systems analysis.
W pracy przedstawiono wersję algorytmu pseudolosowego generowania elektrycznie małych anten liniowych. Prezentowany algorytm umożliwia wybór punktu zasilania anteny. Okazuje się, że lokalizacja punktu zasilania ma duży wpływ na efekt działania algorytmu generującego. Parametry wygenerowanych w ten sposób anten zostały obliczone przy pomocy programu NEC2. W pracy ograniczono się do struktury symetrycznego dipola z ramieniem o ustalonej długości umieszczonego nad powierzchnią doskonale przewodzącą. Ramię dipola zostało podzielone na segmenty o jednakowej długości, które są dowolnie ułożone w przestrzeni.
EN
In this paper several non-randomly generated structures of electrically small linear antennas are presented. For the anntena configuration, we employ a multisegment wire structure. All generated antenna structures resemble a monopole over the perfectly conducting ground plane. The arm of the monopole is comprised of a fixed number of connected linear wire segments. Segments length are equal. Each segment of the antenna is confined in a hemi-spheric space with a given radius. Total length of monopole is constant. The radiation properties of designed an-tennas were calculated with NEC and compared as a function of the best antennas' gain.
W pracy zaprezentowano wyniki symulacji samoorganizującej się anteny SSA (ang. self structuring antenna). Do symulacji wykorzystano program NEC oraz autorski program z zaimplementowanym algorytmem genetycznym wspomagającym proces symulacji. Przeprowadzono badania nad stabilnością WFS w paśmie 400-1100MHz oraz kierunkowością anteny przy częstotliwości 800MHz.
EN
This paper shows simulation results of self structuring antenna. NEC program is used for simulation of SSA struc-tures. Application with implemented genetic algorithm was written in C++ and used in research work. Studies are focused on stability of VSWR (in bandwidth between 400-1100MHz) and radiation patterns (for 800MHz).
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