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Understanding the impact of the Weather on Human Mobility via LTE Access Traces in Seoul Districts
Zofia Marciniak,Sumin Han,Dongman Lee 한국HCI학회 2021 한국HCI학회 학술대회 Vol.2021 No.1
In the urban area, there are many activity choices such as shopping or staying home. One of the main factors which affects people’s choices is the weather. In this study, the influence of weather conditions on human activity in the urban area is explored. We trace the change in the intensity of the mobile LTE access usage under different weather conditions. We find that pressure and rain are the most impactful conditions, while most affected groups are people in their 20’s and older. People in their 30’s seem to be the least affected and follow their usual activity pattern. Our result can provide insights for spot recommendation, traffic prediction, and sales prediction.
3D Printing Slicer for Computational Texture Generation
Zofia Marciniak,Kongpyung Moon,Andrea Bianchi 한국HCI학회 2023 한국HCI학회 학술대회 Vol.2023 No.2
This paper introduces a novel workflow of 3D printing various finish patterns of an object without CAD modelling an actual surface texture but computationally generating a g-code for 3D printing with an embedded texture. It allows designers to easily convert a simple 3D surface to a textured surface they desire. In this paper, we describe how our slicer generates texture patterns from a given geometry and 3D print 40 samples of textured surfaces to explore the texture design spectrum of our slicer. We also present three applications to demonstrate the feasibility of our texture slicer.
Corporate Benefits from Investing in Poland’s Special Economic Zones
Marek Marciniak 사람과세계경영학회 2011 Global Business and Finance Review Vol.16 No.2
Since Poland embarked on the path of economic and political reform, a record volume of foreign direct investment has streamed into the country. A significant portion of foreign direct investment has been concentrated in special economic zones which offer a variety of business incentives to potential investors. The study provides evidence on how corporate valuations respond to investment announcements by companies in the Polish special economic zones where business incentives are offered. The results show that announcements of investment projects in Poland’s special economic zones by publicly traded companies elicit a positive and significant stock price response. Furthermore, the positive reaction is much stronger for those projects in which the announced monetary value is relatively high. Multinational companies with substantial investment capital and unique capabilities (ownership advantages) benefit from business incentives by investing in special economic zones (location advantages) through the medium of greenfield investment (internalization advantages).
Bayda, Malgorzata,Hug, Gordon L.,Lukaszewicz, Jakub,Majchrzak, Mariusz,Marciniec, Bogdan,Marciniak, Bronislaw Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.12
The kinetics scheme for directly excited, photoreversible reactions is solved exactly under the assumptions of no irreversible side reactions and constant excitation intensity for the duration of the reaction. The advantages of the methodology over the extrapolation-to-zero-time and the back-reaction correction methods are (i) that the quantum yields of both the forward and reverse photoreactions can be obtained starting from either pure reactant or pure product and (ii) the conversion percentage is not limited to a narrow domain in the neighborhood of small conversions. Examples of E-Z photoisomerizations are given to illustrate the fitting procedures required. The results from these examples are compared to the photoisomerization method of extrapolating the empirical quantum yields to zero time and the back-reaction correction. The exact equations are used to justify the extrapolation-to-zero-time method and to establish criteria on extrapolation ranges for the conversion percentage of starting material.
Serum Concentrations of Selenium and Copper in Patients Diagnosed with Pancreatic Cancer
Marcin R. Lener,Rodney J. Scott,Anna Wiechowska-Koz!owska,Pablo Serrano-Fernández,Piotr Baszuk,Katarzyna Jaworska-Bieniek,Grzegorz Sukiennicki,Wojciech Marciniak,Magdalena Muszy"ska,Józef K!adny,Tomas 대한암학회 2016 Cancer Research and Treatment Vol.48 No.3
Purpose Understanding of the etiology and pathogenesis of pancreatic cancer (PaCa) is still insufficient. This study evaluated the associations between concentrations of selenium (Se) and copper (Cu) in the serum of PaCa patients. Materials and Methods The study included 100 PaCa patients and 100 control subjects from the same geographical region in Poland. To determine the average concentration of Se, Cu, and ratio Cu:Se in the Polish population, assay for Se and Cu was performed in 480 healthy individuals. Serum levels of Se and Cu were measured using inductively coupled plasma mass spectrometry. Results In the control group, the average Se level was 76 !g/L and Cu 1,098 !g/L. The average Se level among PaCa patients was 60 !g/L and the mean Cu level was 1,432 !g/L. The threshold point at which any decrease in Se concentration was associated with PaCa was 67.45 !g/L. The threshold point of Cu level above which there was an increase in the prevalence of PaCa was 1,214.58 !g/L. In addition, a positive relationship was observed between increasing survival time and Se plasma level. Conclusion This retrospective study suggests that low levels of Se and high levels of Cu might influence development of PaCa and that higher levels of Se are associated with longer survival in patients with PaCa. The results suggest that determining the level of Se and Cu could be incorporated into a risk stratification scheme for the selection and surveillance control examination to complement existing screening and diagnostic procedures.