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200 results on '"Bojarski, Jacek"'

1. Means in money exchange operations

Author

Bojarski, Jacek and Matkowski, Janusz

Subjects
Mathematics - Classical Analysis and ODEs, 91B26, 26E60 (Primary) 39B22 (Secondary)
Abstract

It is observed that in some money exchange operations, the applied $n$ -variable mean $M$ should be self reciprocally-conjugate, i.e. it should satisfy the equality \[ M\left( x_{1},\ldots,x_{n}\right) M\left( \frac{1}{x_{1}},\ldots,\frac{1}{x_{n}} \right) =1,\quad x_{1},\ldots,x_{n}>0. \] The main result says that the only weighted quasiarithmetic mean satisfying this condition is the weighet geometric mean.

Published
2021

3. Nearly neighbourly families of standard boxes

Author

Bojarski, Jacek, Kisielewicz, Andrzej P., and Przesławski, Krzysztof

Subjects
Mathematics - Combinatorics, 05C35 (Primary), 52C45 (Secondary)
Abstract

It is demonstrated that each nearly neighbourly family of standard boxes in $\mathbb{R}^3$ has at most 12 elements. A combinatorial classification of all such families that have exactly 12 elements is given. All families satisfying an extra property called incompressibility are described. Compressible families are discussed briefly., Comment: 37 pages, 10 figures, 22 tables

Published
2016

6. Parrots in the wild in Polish cities.

Author

Ważna, Agnieszka, Ciepliński, Mateusz, Ratajczak, Weronika, Bojarski, Jacek, and Cichocki, Jan

Subjects
CITIES & towns, BUDGERIGAR, MATING grounds, TEMPERATE climate, RICH people
Abstract

Amateur breeding of parrots as pets has contributed to many species being found in areas where they never occurred in the wild, particularly in warmer regions, but also in the temperate climates of North America and Europe. Climate change is likely to exacerbate this process. We hypothesised that parrots occurred in the wild in the cities of Poland, especially the rose-ringed parakeet, as there are reports of breeding sites in the literature. Using information on lost, found and sighted parrots posted on social media, we have analysed the extent of parrot emergence in Poland. In a period of less than two years (from October 2018, through 2019 and from June to the end of December 2021), 2,675 parrot specimens of 49 species were found in the wild. The most frequently observed species were cockatiel Nymphicus hollandicus (N = 962), budgerigar Melopsittacus undulatus (N = 884) and rose-ringed parakeet Psittacula krameri (N = 182). Parrots were most frequently observed in urban areas, in regions characterized by a higher population size, a higher income and a higher proportion of people with a university degree. Our study shows that the occurrence of parrots, especially rose-ringed parakeets in the wild, needs to be monitored as new breeding sites may appear. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Complementary Use Case Scenario Representations Based on Domain Vocabularies

Author

Śmiałek, Michał, Bojarski, Jacek, Nowakowski, Wiktor, Ambroziewicz, Albert, Straszak, Tomasz, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Engels, Gregor, editor, Opdyke, Bill, editor, Schmidt, Douglas C., editor, and Weil, Frank, editor

Published
2007
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14. Scenario Construction Tool Based on Extended UML Metamodel

Author

Śmiałek, Michał, Bojarski, Jacek, Nowakowski, Wiktor, Straszak, Tomasz, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Briand, Lionel, editor, and Williams, Clay, editor

Published
2005
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15. Writing Coherent User Stories with Tool Support

Author

Śmiałek, Michał, Bojarski, Jacek, Nowakowski, Wiktor, Straszak, Tomasz, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Baumeister, Hubert, editor, Marchesi, Michele, editor, and Holcombe, Mike, editor

Published
2005
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22. Analysis of the impact of simulation model simplifications on the quality of low-energy buildings simulation results

Author

Klimczak Marcin, Bojarski Jacek, Ziembicki Piotr, and Kęskiewicz Piotr

Subjects
Environmental sciences, GE1-350
Abstract

The requirements concerning energy performance of buildings and their internal installations, particularly HVAC systems, have been growing continuously in Poland and all over the world. The existing, traditional calculation methods following from the static heat exchange model are frequently not sufficient for a reasonable heating design of a building. Both in Poland and elsewhere in the world, methods and software are employed which allow a detailed simulation of the heating and moisture conditions in a building, and also an analysis of the performance of HVAC systems within a building. However, these systems are usually difficult in use and complex. In addition, the development of a simulation model that is sufficiently adequate to the real building requires considerable time involvement of a designer, is time–consuming and laborious. A simplification of the simulation model of a building renders it possible to reduce the costs of computer simulations. The paper analyses in detail the effect of introducing a number of different variants of the simulation model developed in Design Builder on the quality of final results obtained. The objective of this analysis is to find simplifications which allow obtaining simulation results which have an acceptable level of deviations from the detailed model, thus facilitating a quick energy performance analysis of a given building.

Published
2017
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48. Model M/G/1 PS w procesie modelowania mechanizmu CSMA-CA sieci standardu IEEE 802.15.4

Author

Eljasz, Dariusz and Bojarski, Jacek

Subjects
modele kolejkowe, IEEE 802.15.4, M/G/1 PS
Abstract

W artykule zaprezentowano modyfikację klasycznego modelu kolejkowego M/G/1 PS, umożliwiającego analizę bezprzewodowych sieci sensorowych standardu IEEE 802.15.4. Analizie poddano parametr związany z czasem przebywania zadania w systemie, dla którego dodatkowo wyznaczono niepewność pomiaru. Dla nowo utworzonego modelu M/G/1 PS CSMA-CA zbadano wpływ rozmiaru przesyłanych danych oraz liczby węzłów na średni czas przebywania zadania w systemie w zestawieniu z danymi uzyskanymi z symulatora NS-2., Studia Informatica, Vol 33, No 3A (2012)

Published
2012
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49. Kanon kręgosłupa człowieka

Author

Mrozkowiak, Mirosław and Bojarski, Jacek

Subjects
złoty podział, ciąg Fibonacciego, krzywizny fizjologiczne kręgosłupa, mora projekcyjna
Published
2011

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