STATISTICAL FEATURES DYNAMICS OF INFORMATION EXCHANGES IN SOCIAL NETWORKS

Author(s):  
Михаил Иванович Купцов ◽  
Владимир Александрович Минаев ◽  
Григорий Александрович Остапенко ◽  
Олег Николаевич Чопоров

Для целей изучения динамики информационных обменов в социальных сетях и прогнозирования на этой основе реальных общественных акций предложена классификации групп пользователей сетей на четыре категории: маркетинговые, политические, блогерские, индивидуальные. Изучены эмпирические распределения различных статистических показателей активности названных категорий в сети «ВКонтакте» применительно к коротким (до 100 дней) и длинным (более 100 дней) промежуткам времени. Показано существование устойчивых нормальных, равномерных и экспоненциальных распределений исследованных статистических показателей и статистически устойчивых связей между ними, пригодных для обоснования динамики развития информационных обменов в социальных сетях и дающих возможность строить регрессионные модели для оценки количества участников различных общественных акций, включая протестные движения. Делается вывод, что следующий шаг в исследованиях данного направления должен быть связан с более глубоким изучением факторов, влияющих на распространение информации в социальных сетях. К ним относятся: дальнейшая дифференциация статистических исследований применительно к маркетинговым, политическим и блогерским сообществам; более детальное изучение устойчивости статистических зависимостей на длинных и коротких временных отрезках; сочетание статистического анализа структуры выделенных сообществ с имитационным моделированием динамики переходов между их группами с учетом латентных (ненаблюдаемых) состояний. For the purpose of studying the dynamics of information exchanges in social networks and forecasting real public actions on this basis, the classification of groups of network users into four categories is proposed: marketing, political, blogging and individual. We studied the empirical distributions of various statistical indicators of the activity of these categories in the Vkontakte network in relation to short (up to 100 days) and long (more than 100 days) time intervals. It shows the existence of stable normal, uniform and exponential distributions of the studied statistical indicators and statistically stable relationships between them, which are suitable for substantiating the dynamics of information exchanges in social networks and make it possible to build regression models for estimating the number of participants in various public actions, including protest movements. It is concluded that the next step in research in this area should be associated with a deeper study of the factors that affect the dissemination of information in social networks. These include: further differentiation of statistical research in relation to marketing, political and blogging communities; a more detailed study of the stability of statistical dependencies over long and short time periods; a combination of statistical analysis of the structure of selected communities with simulation of the dynamics of transitions between their groups, taking into account latent (unobservable) states.

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5682
Author(s):  
Tianyao Zhang ◽  
Diyi Chen ◽  
Jing Liu ◽  
Beibei Xu ◽  
Venkateshkumar M

Literature about the importance of renewable energy resources, including wind and solar energy, is becoming increasingly important; however, these energy sources are unstable and volatile in nature, and are usually integrated with conventional energy sources, such as hydropower, forming hybrid power generation systems that maintain a stable grid. Short-term changes in wind speed or solar radiation intensity have a great impact on the stability of hybrid systems, and have been reported in the literature. However, reliable models to manage such systems are lacking, and previous studies have regarded the hour scale as the minimum baseline for systematic change. In this article, hybrid power systems are proposed that are controlled on very short time intervals. The results of a feasibility analysis of the proposed model indicate the viability of complementary hybrid systems in controlling and maintaining the stability, which are subjected to short durations of fluctuations in wind or solar radiation. The simulation results indicate that the influence of the shutdown of the wind turbine, with the regulation effect of the hydro power, is 3–5 times greater than that of the short-term wind turbulence fluctuation. When the hydro turbine is adopted to adjust the short-term fluctuation of solar radiation, the effect on the system was suppressed to 0.02–0.2 times of the former.


2019 ◽  
Vol 30 (3) ◽  
pp. 295-302
Author(s):  
Laís Gomes de Araújo ◽  
Tamara Soledad Frontanilla Recalde ◽  
Victor Jacometti ◽  
Paula Barreto Costa ◽  
Ricardo Henrique Alves da Silva

Abstract The objective of this study was to evaluate the stability of bite marks in foods in different conditions of time and temperature and their reliability as evidenced in criminal investigations. Sampling came from 20 subjects, who were instructed to bite five pieces of cheese and five pieces of chocolate. Bites were produced by the anterior teeth, from canine to canine, and the volunteers had their dental arches molded to obtain plaster models that were used for later comparison. The samples produced by each participant were stored and analyzed according to the temperature (room and refrigerator) and time period (immediately after, three days, seven days). The linear model with mixed effects using R Core Team and SAS Statistical Software were used for the statistical analysis. The results of this study reveal that the storage temperature of these materials does not exert a significant influence. Both chocolate and cheese showed better results when measurements were made shortly after, however the chocolate showed to be more stable in longer periods of time. By means of this study, it was possible to demonstrate that the storage temperature does not exert a significant influence. However, the bite marks found in foods with greater dimensional stability and short time intervals, are more reliable and allow their use as evidence in criminal investigations. Still, due to the limitations presented, we recommend its use for the exclusion of possible suspects and not for the suspects identification.


2016 ◽  
Vol 136 (12) ◽  
pp. 891-897 ◽  
Author(s):  
Katsuhiro Matsuda ◽  
Kazuhiro Misawa ◽  
Hirotaka Takahashi ◽  
Kenta Furukawa ◽  
Satoshi Uemura

Author(s):  
Elena Yu. Balashova ◽  
◽  
Lika I. Mikeladze ◽  
Elena K. Kozlova ◽  
◽  
...  

2019 ◽  
pp. 1-13
Author(s):  
Luz Judith Rodríguez-Esparza ◽  
Diana Barraza-Barraza ◽  
Jesús Salazar-Ibarra ◽  
Rafael Gerardo Vargas-Pasaye

Objectives: To identify early suicide risk signs on depressive subjects, so that specialized care can be provided. Various studies have focused on studying expressions on social networks, where users pour their emotions, to determine if they show signs of depression or not. However, they have neglected the quantification of the risk of committing suicide. Therefore, this article proposes a new index for identifying suicide risk in Mexico. Methodology: The proposal index is constructed through opinion mining using Twitter and the Analytic Hierarchy Process. Contribution: Using R statistical package, a study is presented considering real data, making a classification of people according to the obtained index and using information from psychologists. The proposed methodology represents an innovative prevention alternative for suicide.


2018 ◽  
Vol 35 (4) ◽  
pp. 133-136
Author(s):  
R. N. Ibragimov

The article examines the impact of internal and external risks on the stability of the financial system of the Altai Territory. Classification of internal and external risks of decline, affecting the sustainable development of the financial system, is presented. A risk management strategy is proposed that will allow monitoring of risks, thereby these measures will help reduce the loss of financial stability and ensure the long-term development of the economy of the region.


Author(s):  
Рубен Косян ◽  
Ruben Kosyan ◽  
Viacheslav Krylenko ◽  
Viacheslav Krylenko

There are many types of coasts classifications that indicate main coastal features. As a rule, the "static" state of the coasts is considered regardless of their evolutionary features and ways to further transformation. Since the most part of the coastal zone studies aimed at ensuring of economic activity, it is clear that the classification of coast types should indicate total information required by the users. Accordingly, the coast classification should include the criterion, characterizing as dynamic features of the coast and the conditions and opportunities of economic activity. The coast classification, of course, should be based on geomorphological coast typification. Similar typification has been developed by leading scientists from Russia and can be used with minimal modifications. The authors propose to add to basic information (geomorphological type of coast) the evaluative part for each coast sector. It will include the estimation of the coast changes probability and the complexity of the coast stabilization for economic activity. This method will allow to assess the dynamics of specific coastal sections and the processes intensity and, as a result – the stability of the coastal area.


Author(s):  
A.C.C. Coolen ◽  
A. Annibale ◽  
E.S. Roberts

This chapter reviews graph generation techniques in the context of applications. The first case study is power grids, where proposed strategies to prevent blackouts have been tested on tailored random graphs. The second case study is in social networks. Applications of random graphs to social networks are extremely wide ranging – the particular aspect looked at here is modelling the spread of disease on a social network – and how a particular construction based on projecting from a bipartite graph successfully captures some of the clustering observed in real social networks. The third case study is on null models of food webs, discussing the specific constraints relevant to this application, and the topological features which may contribute to the stability of an ecosystem. The final case study is taken from molecular biology, discussing the importance of unbiased graph sampling when considering if motifs are over-represented in a protein–protein interaction network.


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