A threshold model of financial markets

We proposed a model of interacting market agents based on the Ising spin model. The agents can take three actions: "buy," "sell," or "stay inactive." We defined a price evolution in terms of the system magnetization. The model reproduces main stylized facts of real markets such as: fat-tailed distribution of returns and volatility clustering

Blender as a tool for generating synthetic data

Acquiring data for neural network training is an expensive and labour-intensive task, especially when such data isdifficult to access. This article proposes the use of 3D Blender graphics software as a tool to automatically generatesynthetic image data on the example of price labels. Using the fastai library, price label classifiers were trained ona set of synthetic data, which were compared with classifiers trained on a real data set. The comparison of the resultsshowed that it is possible to use Blender to generate synthetic data. This allows for a significant acceleration of thedata acquisition process and consequently, the learning process of neural networks

Senior Recital: Joanna Sieczka, Horn; Grace Eom, Piano; November 27, 2023

Kemp Recital HallNovember 27, 2023Monday Evening7:30 p.m

Modelling groundwater flow and nitrate transport: a case study of an area used for precision agriculture in the middle part of the Vistula River valley, Poland

The present paper discusses studies related to the preparation of a hydrogeological model of groundwater flow and nitrate transport in an area where a precision farming system is applied. Components of water balance were determined using the UnSat Suite Plus software (HELP model), while the average infiltration rate calculated for the study area equalled 20 per cent. The Visual MODFLOW software was used for the purpose of modelling in the saturated zone. Hy- drogeological parameters of the model layers, inclusive of hydraulic conductivity, were defined on the basis of results of column tests that were carried out under laboratory conditions (column experiment). Related to the dose of mineral nitrogen used in precision fertilisation (80 kg N/ha), scenarios of the spread of nitrates in the soil-water environment were worked out. The absolute residual mean error calculated for nitrate concentrations obtained from laboratory and modelling studies equalled 0.188 mg/L, the standard error of the estimate equalling 0.116 mg/L. Results obtained were shown graphically in the form of hydroisohypse maps and nitrate isolines. Conclusions were drawn regarding the possibility of using numerical modelling techniques in predicting transport and fate of nitrates from fertilisers applied in precision agriculture systems

Zastosowanie spersonalizowanych systemów rekomendacyjnych jako potencjał dla badań socjologicznych – na przykładzie portalu filmowego

Personalised Recomendation Systems as Potential for Sociological Research in Case of Movie DatabaseIn my article I would try to present concept of using film portal as a research tool. What distinguishes this method from conventional quantitative methods is the size of the resulting sample. Th e problem of assessing the film is necessity for evaluating it using a specific scale, to which we, as a human beeings, are not fittest. Our judgments may vary depending on the conditions under which the film is viewed. It is this aspect of the evaluation, I would like to draw attention. Proposed study will takes account of four assessment modifiers, such as: individual factors, II context of group III quality of the image, IV evaluators state of knowledge

Entrepreneurial scheme place of business

Práce hodnotí podnikatelský záměr firmy na změnu dosavadních nevyhovujících prostor a informačního systému. Za pomocí finanční analýzy stanovuje, zda je firma dostatečně finančně zdatná na změnu, zda si případnou změnu může dovolit a co jí tato změna přinese. Následně je firmě doporučena vhodná varianta změny a jsou stanoveny náklady, přínosy a rizika, které jsou s touto změnou spojeny.The thesis deals with entrepreneurial scheme of the firm for change of present unsuitable spaces and information system. By means of financial analysis determines, if the firm is finance able enough for the change and if the firm can afford the change and what will bring the change to this firm. Afterwards the suitable variant of the change is recommended and also costs, benefits and risks connected with this change are determinated.

Statistical properties of short term price trends in high frequency stock market data

We investigated distributions of short term price trends for high frequency stock market data. A number of trends as a function of their lengths was measured. We found that such a distribution does not fit to results following from an uncorrelated stochastic process. We proposed a simple model with a memory that gives a qualitative agreement with real data.Comment: 10 pages, 9 figures, in ver. 2 one chapter adde

Endoprotezy stawów biodrowych wczoraj i dziś

Endoprotezoplastyka stawu biodrowego jest w XXI wieku złotym standardem leczenia zaawansowanych zmian destrukcyjnych stawów biodrowych w przebiegu wielu jednostek chorobowych. Co czwarta osoba w starszym wieku będzie miała objawy choroby zwyrodnieniowej stawu biodrowego w trakcie swojego życia, a co dziesiąta przejdzie operację całkowitej endoprotezoplastyki tego stawu. Początki leczenia za pomocą alloplastyki stawu biodrowego sięgają XIX wieku, lecz główny rozwój tego sposobu leczenia to poprzednie stulecie. Wielcy mistrzowie chirurgii jak sir John Charnley, Austin Moore czy Peter Ring inspirują kolejne pokolenia ortopedów do udoskonalania leczenia sposobem alloplastyki i pozwalają przywracać sprawność osobom, które w skutek procesu chorobowego zapomniały, jak można poruszać się swobodnie i bez dolegliwości bólowych. Forum Reumatol. 2017, tom 3, nr 4: 216–221