Wyniki wyszukiwania - BazTech

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Metody dystrybucji produktów wirtualnych na przykładzie wieloosobowych gier internetowych

Czetwertyński S.

Zeszyty Naukowe. Studia Informatica / Uniwersytet Szczeciński

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2014

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Nr 35

5--15

PL

Niniejszy artykuł jest próbą odpowiedzi na pytanie o przyczyny upowszechnienia się nieodpłatnego dostępu do wieloosobowych gier internetowych (MMO). W tym celu przedstawiono modele dystrybucji gier MMO, wykazując ich istotę. W rozważaniach przyjęto hipotezę, że popularyzacja modelu nieodpłatnego udostępniania gier MMO wynika z ich cyfrowego charakteru oraz usieciowienia. Dla udowodnienia tej hipotezy przedstawiono cechy charakterystyczne cyfrowych dóbr informacyjnych oraz struktur sieciowych. W podsumowaniu zebrano wnioski oraz wysnuto prognozy co do prawdopodobnego kierunku rozwoju omawianego rynku.

EN

This article is an attempt to answer the question about the causes of spread of free access to massively multiplayer online games (MMOG). To answer that author shows MMOGs distribution models pointing their unique nature. In the considerations was hypothesized that the popularization of the free-to-play MMOGs is result from their digital and network nature. To prove this hypothesis author analyzes the characteristics of digital information goods and network structures. In summary there are conclusions and attempt to forecast development direction of this market.

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Identification of driving factors for presence of endemic species in the Aglasun district of the Mediterranean Region, Turke

Ozkan K.

Polish Journal of Ecology

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2012

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Vol. 60, nr 2

291-30

EN

This study was addressed to environmental factors significantly influencing the habitat preferences of endemic species and to obtain a model of their common habitat preferences in the Aglasun district. The district, covering an area of 55,000 hectares, is located in the lakeland subregion of the Mediterrranean region, Turkey. Data were collected from 199 sample plots (20 x 20 m ) and in total 40 endemic taxa was recorded in 124 plots which include minimum one endemic species. Wilcoxon rank-sum statistic and Pearson chisquared tests were used for continuous and categorical explanatory variables, respectively. The factors playing important roles in habitat preferences of endemic species were following: altitude, radiation index, soil texture, landscape position and landform. Generalized additive model was used for modelling the habitat preferences of endemic taxa. To obtain the best model, all significant environmental factors were evaluated by selecting stepwise option. Finally, the best model was obtained (training AUC = 0.816, and crossvalidation AUC = 0.800) by using altitude and landform variables.

3

Key factors in the site selection of Rosa canina (L.) - applying the Generalized Additive Model

Guner S., Ozkan K., Comez A.

Polish Journal of Ecology

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2011

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Vol. 59, nr 3

475-482

EN

Determining suitable sites for species is of great importance in the choice of plant species to be used for ecosystem restoration. The number of plant species to be used in restoration of degraded ecosystems is restricted by climate in arid and semi arid regions. Planting with economically important species in addition to ecological aspects is preferred by decision makers in Mediterrenian countries including Turkey. This study was addressed to determine the significant environmental factors influencing the distribution of dog rose hip (Rosa canina) and to obtain its distribution model. The study was carried out in an area of 26,400 km2 in The Inner Anatolia which has semiarid climate. 106 sample plots, 20 x 20 m in size, were selected from different sites with and without Rosa canina in the summer of 2007. Wilcoxon rank-sum statistic for continuous variables and Pearson Chi-square tests for categorical variables were applied. Altitude, slope degree, available water capacity, soil reaction and soil K, Ca, Mg content as well and total calcium carbonate amount as the continuous variables and northwest-northeast group of aspect, metamorphic group of bedrock as the categorical variables were determined as the significant factors influencing the presence of dog rose. Generalized Additive Model (GAM) was performed for modeling the distribution of the species. To obtain the best model, all significant environmental factors were evaluated. The best model result was obtained (training Area Under Curve (AUC) = 0.902 and cross-validation AUC = 0.841) by means of altitude, slope degree, aspect, and bedrock. Interspecific correlation analysis (ICA) was applied to define indicator species accompanying the dog rose. Dog rose distribution was positively correlated with Cistus laurifolius, Pyrus elaeagnifolia, Lonicera caucasica subsp. orientalis, Quercus vulcanica and Amelanchier rotundifolia subsp. rotundifolia. The results obtained from this study are crucial for estimation of the suitable areas for Dog rose in restoration studies of natural ecosystems in the Mediterranean region, including Anatolia in Turkey.