Books by Jacek Pietraszek
Papers by Jacek Pietraszek
Production Engineering Archives
A number of modern surface processing methods use an energy flux. The examples include electro-sp... more A number of modern surface processing methods use an energy flux. The examples include electro-spark deposition (ESD) and laser beam processing (LBP). The work concerns the study of Cu-Mo coatings deposited on C45 carbon steel, which were then eroded with a laser beam. The analysis included the analysis of the microstructure, measurements of macrogeometry and microhardness, corrosion resistance tests of selected areas after laser treatment. The coatings were applied with ELFA-541 and subjected to Nd:YAG laser treatment with variable laser parameters. The problem presented in the work can be used to extend the knowledge of the areas of application of ESD coatings, especially in sliding friction pairs.
This document presents the technical layout and the envisaged performance of the Electromagnetic ... more This document presents the technical layout and the envisaged performance of the Electromagnetic Calorimeter (EMC) for the PANDA target spectrometer. The EMC has been designed to meet the physics goals of the PANDA experiment, which is being developed for the Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany. The performance figures are based on extensive prototype tests and radiation hardness studies. The document shows that the EMC is ready for construction up to the front-end electronics interface.
System Safety: Human - Technical Facility - Environment, 2019
The bootstrap method is a well-known method to gather a full probability distribution from the da... more The bootstrap method is a well-known method to gather a full probability distribution from the dataset of a small sample. The simple bootstrap i.e. resampling from the raw dataset often leads to a significant irregularities in a shape of resulting empirical distribution due to the discontinuity of a support. The remedy for these irregularities is the smoothed bootstrap: a small random shift of source points before each resampling. This shift is controlled by specifically selected distributions. The key issue is such parameter settings of these distributions to achieve the desired characteristics of the empirical distribution. This paper describes an example of this procedure.
International Journal of Surface Science and Engineering, 2016
Lecture Notes in Computer Science, 2016
Typically, the analysis of variance (ANOVA) is used to compare means in the subsets obtained thro... more Typically, the analysis of variance (ANOVA) is used to compare means in the subsets obtained through the division of a large numerical dataset by assigning a categorical variable labels to dataset’s values. The test criterion for the decision on ‘all equal’ vs. ‘not all equal’ is a comparison of the significance level described by a well-known p-value and the a priori assigned critical significance level, α, usually 0.05. This comparison is treated very strictly basing on the crisp value; however, it should not be so, especially if p-value is near α, because the certainty of the decision varies rather smoothly from ‘strongly not’ to ‘no opinion’ to ‘strongly yes’. It is very interesting to analyze such results on the basis of the fuzzy arithmetic theory, using the modified Buckley’s fuzzy approach to the statistics combined with the bootstrap approach, because it may be adopted to the cases where subjective assessments are introduced as quasi-measurements.
Solid State Phenomena, 2015
Typical design of experiments (DoE) approach to the response surface problem applies the polynomi... more Typical design of experiments (DoE) approach to the response surface problem applies the polynomials with at most the second order terms. It is correct due to the Taylor’s theorem when the variability of input variables is sufficiently small. Unfortunately, the variability bound of a designed experiment is planned with high uncertainty about the investigated object’s behavior. If the response of the object has a large curvature then model quality indicators (residuals normality, lack of fit, significance of terms) appear to be unacceptable. In such a case, polynomial terms with the order higher than second should be applied. The paper describes the RSM model with the fourth order terms identified for relationship between settings of a meat tumbler machine (input variables) and the Warner-Bratzler shear force (output variable).
Solid State Phenomena, 2013
The ferritic-austenitic stainless steel was obtained by sintering the mixture of ferritic stainle... more The ferritic-austenitic stainless steel was obtained by sintering the mixture of ferritic stainless steel AISI 434L powders with different amount of additions: Mn, Ni and Si. The structure of obtained sintered samples was investigated by computer image analysis methods. In porous materials the character of the pore structure strongly effects on its mechanical properties. Accurate information about pores shape is important information for technological process and quality control of produced materials as well. The images of the porous microstructure were analyzed using ADCIS Aphelion analytical software. Analyzed pores have complex and irregular shapes and thus authors decided to appoint different shape factors to obtain its proper quantitative description. Data obtained from image analysis process were statistically analyzed. Authors used a special resampling approach known as smooth bootstrapping to smoothing cumulative empirical distributions. The results obtained during resamplin...
Современные достижения в науке и образовании: Сборник трудов международной научной конференции, 9–17 сентября 2007г.–Хмельницкий: ХНУ, 2007.–206 с., Sep 9, 2007
Real-estate agency AD Drągowski, the authors co-operated with, was established in Warsaw in 1991.... more Real-estate agency AD Drągowski, the authors co-operated with, was established in Warsaw in 1991. Its information system started from typical DOS-based single user program with local database and through the years was developed into multi-user network system but continuously based on DOS-station and xBase format file database. In the recent years agency expanded into branch offices located in cities other than Warsaw. It appeared necessary to re-design existing system. Unfortunately, feasibility study appears that way ...
ABSTRACT: Program MathCAD to aplikacja służąca do wykonywania złożonych obliczeń, wizualizacji ic... more ABSTRACT: Program MathCAD to aplikacja służąca do wykonywania złożonych obliczeń, wizualizacji ich wyników, a także tworzenia dokumentacji projektowej. Przeznaczony przede wszystkim dla inżynierów i projektantów, powinien również zainteresować wszystkie osoby, potrzebujące zaawansowanego pakietu matematycznego. Statystyka, analiza matematyczna, obliczenia finansowe, dwu-i trójwymiarowe wykresy, to tylko niektóre dziedziny zastosowań MathCAD-a.
The paper presents an implementation of a dynamically created database filter for filtering exper... more The paper presents an implementation of a dynamically created database filter for filtering experimental design during a session with the DOE advising expert system [1, 2]. Decision support for an investigator through the process of experiment designing is the main purpose of the system. The key element of the system is a module transforming data gathered from the user into the proper SQL selection filtering the system knowledge database. The selection is executed over the database containing 720 experimental designs described ...
Przetwórstwo Tworzyw, 2011
Streszczenie. Opisano proces wyboru planu doœwiadczenia dla badań materiałowych wspomagany doradc... more Streszczenie. Opisano proces wyboru planu doœwiadczenia dla badań materiałowych wspomagany doradczym systemem ekspertowym. Zaproponowano uzupełniający mechanizm klasyfikacyjny umożliwiający dodatkowe zawężenie listy proponowanych planów. Przedstawiono przykład klasyfikacji zagadnienia odniesiony do badań uszczelnień w siłownikach hydraulicznych maszyn roboczych.
Copyright © StatSoft Polska, 2004 Kopiowanie lub powielanie w jakikolwiek sposób bez zgody StatSo... more Copyright © StatSoft Polska, 2004 Kopiowanie lub powielanie w jakikolwiek sposób bez zgody StatSoft Polska Sp. z oo zabronione ... StatSoft Polska, tel. (12) 4284300, (601) 414151, info@statsoft.pl, www.statsoft.pl ... Jacek Pietraszek Politechnika Krakowska, Instytut Informatyki Stosowanej ... Prezentowany artykuł poświęcony jest wybranym zagadnieniom planowania doświadczeń. Po przedstawieniu najważniejszych informacji niezbędnych do zrozumienia koncepcji leżących u podłoża tych metod zaprezentowany zostanie przykład ich zastosowania. ...
21st International Scientific Conference Engineering for Rural Development Proceedings
Lecture Notes in Computer Science, 2013
ABSTRACT The paper presents modified formalism to perform fuzzy operations on correlated assessme... more ABSTRACT The paper presents modified formalism to perform fuzzy operations on correlated assessments. The application of the standard formalism used in Zadeh’s fuzzy logic requires an arbitrary setting of triangular norms and sometimes provides ridiculous results which are inconsistent with the gathered experimental data. The author discovered that the membership function’s value may be treated as the mean of statements individually evaluated into YES or NO by a panel of human judges with identifiable identity. It leads to a fundamental change because a pair of triangular norms selected for fuzzy logic is proven and not arbitrarily set. The paper proposes generalization of the fuzzy description into a form of a binary vector. It moves evaluation of statements with fuzzy logic variables into the space of vectors of Boolean components. The new interpretation gives fuzzy variables and values an identity, which is necessary for operations with correlations. Additionally, due to a binary vector data structure, it potentially allows to perform computations utilizing collective intelligence methods such as genetic algorithms.
Uploads
Books by Jacek Pietraszek
Papers by Jacek Pietraszek