кластерний аналіз

Запропоновано алгоритм кластеризації текстових документів методом k–середніх у векторному просторі частотних характеристик семантичних полів. Показано ефективність семантичного кластерного аналізу при вивченні класифікацій текстових документів, зокрема за авторством.

The algorithm of clusterization of text documents by k–means method in the vector space of frequencies characteristics of semantic fields has been proposed. The effectiveness of semantic cluster analysis for investigation of text documents classifications, particularly authorship has been shown.

This work studies the impact of electromagnetic fields on the degradation of agricultural land. During the analysis of available sources of information, it was found that in the scientific publications by domestic authors, there is no mention of such a factor of land degradation as the action of electromagnetic fields (EMF) of man-made origin. Numerous scientific works by foreign experts present the results of experimental studies that confirm the negative impact of electromagnetic radiation (EMR) of power lines (PL) on agricultural land.

The results of the study of the adsorption capacity of a number of sorbents of natural and synthetic origin with respect to iron ions have been clustered. The sorption capacity of the following sorbents was studied: natural zeolite of the Sokyrnytsia deposit, synthetic sorbent based on the ash of Doborotvir heat power plant, Al2O3, SiO2, as well as some types of soils: sandy soil, black soil and clay. Equations describing the regularities of adsorption processes depending on the type of sorbent are obtained.

The results of the research of the adsorption capacity of a number of sorbents of natural and synthetic origin for ammonium ions have been clustered. The natural zeolite of the Sokyrnytsia deposit, a synthetic sorbent based on the fly ash of Dobrotvir state district heat power plant, Al2O3, SiO2, as well as some types of soil: sandy soil, black soil, and clay were used in the research. Equations describing the regularities of adsorption processes depending on the type of sorbent were obtained. According to the obtained dendrograms, two main clusters of sorbents were identified.

The article deals with the main quantification methods of the system of checks and balances. Taking into account the main historical stages of the development of ideas concerning the functioning of the checks and balances system, on the basis of the comparative method, the main features of understanding the functioning of different aspects of checks and balances system by using mathematical methods are emphasized.

The essence of the health resort complex is revealed in the article. Peculiarities of the
subjects of health resort activity in the context of their orientation, belonging, socio-economic
effect, influence on related areas, global role, and subordination are described.
The typology of subjects of health resort activity in the current normative-legal acts is
investigated. The difference in approaches to the selection of types of health resorts by a
number of institutions of Ukraine is described.

Проаналізовано кластеризацію текстових повідомлень груп новин на основі моделі векторного простору із базисом, утвореним семантичними ознаками. Як семантичні ознаки розглянуто частотні характеристики семантичних та тематичних полів. Показано ефективність запропонованої моделі у тематичному аналізі неструктурованих текстових повідомлень.

Procedures of data mining based on prediction of time series for land cadastre data are described in this article. Principles required for the development of the method of forecasting using time serious are examined. Mathematical model is developed. The task of predicting land resources use in Striyskyi Park in Lviv is technically realized.

In the article the theoretical principles and the methodological and practical recommendations to enhance the effectiveness of the economic mechanism of operation of commercial enterprises are introduced and grounded. The role and place of the economic mechanism in the economic mechanism of the enterprise is studied. The possibility of using the method of cluster analysis for evidence-based segmentation of commercial enterprises is revealed.

The article describes the features of the identification of problem situations and their states using the modified algorithm FOREL of clasterization. The main difference of the modified algorithm from the classical one is the user’s ability to set the quality score for clusters, which makes the algorithm flexible in analyzing problem situations and states in complex technical systems.