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1
Content available remote On entropy of patterns given by interval maps
100%
Bobok J.
Fundamenta Mathematicae
|
1999
|
tom 162
|
nr 1
1-36
EN
Defining the complexity of a green pattern exhibited by an interval map, we give the best bounds of the topological entropy of a pattern with a given complexity. Moreover, we show that the topological entropy attains its strict minimum on the set of patterns with fixed eccentricity m/n at a unimodal X-minimal case. Using a different method, the last result was independently proved in[11].
2
Content available remote Controlling chaos by developing spiral wave from heterogeneity in excitable medium
100%
Chen J.-X. , Xu J.-R. , Zhang X.-P. , Zhang J.-W. , Zhang X.-W.
Open Physics
|
2009
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tom 7
|
nr 1
108-113
EN
We study pattern formation induced by a spiral wave developing from heterogeneities in an excitable medium. Turbulence can be suppressed by a spiral wave from the heterogeneity, forming multiple coexistent systems of regular geometrical patterns. We find that the types of these patterns depend critically on the degree of heterogeneity. The underlying mechanism is due to dispersion relation which is characterized by excitability.
3
Content available remote Algorithms for Context Based Sequential Pattern Mining
75%
Ziembiński R.
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2007
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tom Vol. 76, nr 4
495-510
EN
This paper describes practical aspects of a novel approach to the sequential pattern mining named Context Based Sequential Pattern Mining (CBSPM). It introduces a novel ContextMapping algorithm used for the context pattern mining and an illustrative example showing some advantages of the proposed method. The approach presented here takes into consideration some shortcomings of the classic problem of the sequential pattern mining. The significant advantage of the classic sequential patterns mining is simplicity. It introduces simple element construction, built upon set of atomic items. The comparison of sequence's elements utilizes simple inclusion of sets. But many practical problems like web event mining, monitoring, tracking and rules generation often require mining more complex data. The CBSPM takes into account non nominal attributes and similarity of sequence's elements. An approach described here extends traditional problem adding a vector of context attributes of any kind to sequences and sequence’s elements. Context vectors contain details about sequence's and element's origin. The mining process results in context patterns containing additional, valuable context information useful in interpretation of patterns origin.
4
Dostosowanie metod badania rozbieżności deseni próbek do percepcji człowieka
75%
Karnasiewicz P.
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2008
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tom Vol. 29, nr 3A
39-49
PL
Niniejszy artykuł omawia metodę badania jakości próbkowania stosowaną w grafice komputerowej, jaką jest rozbieżność deseni. Podjęto próbę dostosowania tej metody do tego, jak desenie są postrzegane przez człowieka. W pracy przedstawionych jest kilka metod próbkowania, które są w jej dalszej części wykorzystywane w testach rozbieżności deseni.
EN
The following article presents pattern discrepancy, which is a method for measuring the quality of sampling used in computer graphics. An attempt has been taken to adapt this method to the way the patterns are perceived by human. In the article we present several methods of sampling, which are then used for testing pattern discrepancy.
5
Content available remote Creative formation of products in mechanical engineering
75%
Novakova J. , Cep R. , Legutko S.
|
2008
|
tom Vol. 28, nr 4
71-78
EN
This contribution is dealing with products creation in progressive machining. Creatics is new science discipline which formulates laws of production of objects. The production has its theoretical background. The contribution informs about the evolution and the present state and formulated axioms and laws. The revealed laws prove convergence of phenomena and processes of production. The laws show that the theoretical number of variant of part manufacturing processes is innumerable. The advantages of use creatics for practice are described in final evaluation.
PL
Niniejszy artykuł jest poświęcony refleksji nad tworzeniem wyrobów. Kreatyka jest nową dyscypliną nauki, w obrębie której formułuje się prawa produkcji obiektów. Produkcja ma swoją teoretyczną podbudowę. W pracy podano informacje na temat ewolucji i obecnego stanu kreatyki oraz sformułowanych aksjomatów i praw. Odkryte prawa dowodzą konwergencji zjawisk i procesów produkcji. Prawa te pokazują, że teoretyczna liczba wariantów procesów wytwarzania części jest ogromna. Korzyści związane z zastosowaniem kreatyki w praktyce opisano w końcowej części pracy.
6
Content available remote X-minimal patterns and a generalization of Sharkovskiĭ's theorem
75%
Bobok J. , Kuchta M.
Fundamenta Mathematicae
|
1998
|
tom 156
|
nr 1
33-66
EN
We study the law of coexistence of different types of cycles for a continuous map of the interval. For this we introduce the notion of eccentricity of a pattern and characterize those patterns with a given eccentricity that are simplest from the point of view of the forcing relation. We call these patterns X-minimal. We obtain a generalization of Sharkovskiĭ's Theorem where the notion of period is replaced by the notion of eccentricity.
7
Content available remote Information Granule Decomposition
75%
Skowron A. , Stepaniuk J.
|
2001
|
tom Vol. 47, nr 3,4
337-350
EN
Information sources provide us with granules of information that must be transformed, analyzed and built into structures that support problem solving. One of the main goals of information granule calculi is to develop algorithmic methods for construction of complex information granules from elementary ones by means of available operations and inclusion (closeness) measures. These constructed complex granules represent a form of information fusion. Such granules should satisfy some constraints like quality criteria or/and degrees of granule inclusion in (closeness to) a given information granule. Information granule decomposition methods are important components of those methods. We discuss some information granule decomposition methods.
8
Content available Exploring the Local Grammar of Evaluation: The Case of Adjectival Patterns in American and Italian Judicial Discourse
75%
Pontrandolfo G. , Goźdź-Roszkowski S.
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|
tom 12
|
nr 1
71-91
EN
Based on a 2-million word bilingual comparable corpus of American and Italian judgments, this paper tests the applicability of a local grammar to study evaluative phraseology in judicial discourse in English and Italian. In particular, the study compares the use of two patterns: v-link + ADJ + that pattern / copula + ADJ + che and v-link + ADJ + to-infinitive pattern / copula + ADJ + verbo all’infinito in the disciplinary genre of criminal judgments delivered by the US Supreme Court and the Italian Corte Suprema di Cassazione. It is argued that these two patterns represent a viable and efficient diagnostic tool for retrieving instances of evaluative language and they represent an ideal starting point and a relevant unit of analysis for a cross-language analysis of evaluation in domainrestricted specialised discourse. Further, the findings provided shed light on important interactions occurring among major interactants involved in the judicial discourse.
9
Content available remote Pattern analysis. Study on composition structure in music and architecture
63%
Słyk J.
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2010
|
tom Vol. 3, no. 3
25-32
EN
Researching generative processes in design leads one towards theory of architecture. Evaluation of created forms demands exact instruments. In the engineering field mathematical models could be implemented as well as rules derived from laws of physics. Parametric description of aesthetical solution requires rules we do not have. Art object needs calibration accordingly to algorithmic criteria. Is it possible? Architectural debate focuses on holistic aspects of reality. Building, design project, concept exists as completed subject. Researching architectural molecules we prefer global, arbitrary definitions much more to micro-scale analysis. Experiments described in this paper illustrate efforts made to discover and understand elementary architectural tissue. Juliusz Żórawski's idea, introduced far before Christopher Alexander's algorithmic methodology, constitutes foundation for evaluation as well as for creation processes. Data acquisition, differently than procedures present in generative concepts, relies on rational analysis of space. Structural optimization as well as individual/ accidental/chaotic parameters are taken into account with secondary importance. Authors aim to research whether architectural argument can benefit from elementary analysis of patterns as proved on the field of contemporary music. If yes - can we implement discovered rules for generative form-creation processes?
PL
Refleksja nad użytecznością generatywnych metod projektowania wiedzie ku teorii architektury. Dokonywanie oceny efektów twórczej działalności wymaga precyzyjnych narzędzi. W obszarze technicznym - dostarczają ich matematyczne modele procesów oraz reguły wywiedzione z praw fizyki. Chcąc parametrycznie opisać estetykę rozwiązania - musimy ściśle sformułować zasady, czyli ustalić kryteria ewaluacji odpowiadające logice algorytmicznej. Czy jest to możliwe? Opis architektoniczny posługuje się nader często ogólnym postrzeganiem rzeczywistości. Projekt, budynek, jednostkowa idea traktowane są w nim jak zamknięte i skończone podmioty wywodu. Analiza w mikroskali, poszukiwania struktury najdrobniejszych elementów składowych i reguł ich wiążących ustępują miejsca definicjom stylów, ograniczonych niekiedy do produktów wąskiej grupy twórców. Przedstawione w artykule eksperymenty dążą ku poznaniu struktury architektonicznej na poziomie elementarnym. Koncepcja Juliusza Żórawskiego, wyprzedzająca algorytmiczne podejście do analizy przestrzennej znane z prac Christophera Alexandra staje się podstawą dla dokonywania oceny i generowania form architektonicznych. W odróżnieniu do wielu współczesnych koncepcji, źródłem informacji o powstającym obiekcie nie jest zespół przypadkowo pozyskanych danych oraz rezultat optymalizacji strukturalnej. Autor próbuje zbadać, czy podobnie jak w analogicznych studiach nad kompozycją muzyczną, akwizycja informacji architektonicznej może odbywać się na gruncie racjonalnej analizy uporządkowań. Jeśli tak - czy reguły wywiedzione z modelu teoretycznego posłużyć mogą do konstruowania nowych rozwiązań?
10
Content available remote Zastosowanie polimerów poligraficznych w technologii wytwarzania odlewów artystycznych
63%
Binczyk F. , Janowski G. , Smoliński A.
|
2006
|
tom R. 6, nr 19
25-30
PL
W pracy przedstawiono zasady oraz kolejne etapy technologiczne wykonania modeli i odlewania medali pamiątkowych Politechniki Śląskiej i Katedry Technologii Stopów Metali i Kompozytów., w której do wykonania modeli wykorzystuje się poligraficzne polimery światło utwardzalne, używane w produkcji matryc i pieczęci. Opracowana technologia jest ekonomiczna zarówno pod względem wymaganych urządzeń i materiałów, a czas wykonania modelu polimerowego nie przekracza jednej godziny.
EN
In this work the principles as well as next stages were introduced was the technological realizations of models and the casting the commemorative medals of Silesian Technical University and Department of Technology Metals Alloys and Composites has been presented. In which the printing polymers to realization of models were used was the hardening light, used in production of matrices and stamp.
11
Content available remote Wykorzystanie sieci neuronowej MLP2LN do wyszukiwania wzorców i reguł w bazach danych pozyskiwanych z badań tribologicznych
63%
Wójcicki T.
|
2002
|
tom nr 4
33-45
PL
W artykule przedstawono metodę wyszukiwania wzorców i reguł w danych z wykorzystaniem sieci neuronowej typu MLP2LN. Opisano architekturę sieci, sposób definiowania zmiennych lingwistycznych, funkcję kosztu, algorytm uczenia, sposób interpretacji węzłów warstwy regułowej. Pokazano przykład zastosowania metody do analizy danych pozyskiwanych z badań tribologicznych.
EN
This paper shows method for patterns and rules searching in data with the use of MLP2LN neural network. Basic problems occurring in designing process area briefly described. The example of method application in tribological research is presented.
12
Content available remote The lost foam process in pilot castings plattes
63%
Żółkiewicz Z. , Żółkiewicz M.
|
2009
|
tom Vol. 9, iss. 2
143-146
EN
The paper discusses the process of thermal evaporation of a foundry pattern. At several research-development centres, studies have been carried out to examine the physico-chemical phenomena that take place in foundry mould filled with polystyrene pattern when it is poured with molten metal. In the technique of evaporative patterns, the process of mould filling with molten metal (the said mould holding inside a polystyrene pattern) is interrelated with the process of thermal decomposition of this pattern. The process of polystyrene pattern evaporation in foundry mould under the effect of molten metal is of a very complex nature and depends on many different factors, still not fully investigated. The technology of evaporative patterns was used in manufacture of pilot castings of the high abrasion resistance plates. The material and the properties of the resultant castings were determined by the customer (patent protection). At the beginning of the studies, the properties of the pattern material were determined, patterns were assembled, the properties of the ceramic layer were determined as well as the technique of its preparation and application. The technique of molten metal feeding to the mould cavity was examined along with the parameters of the gating and feeding system, and casting cooling and solidification conditions (large contraction, shrinkage cavities and depressions).
13
Content available remote Rapid manufacturing of castform patterns for investment casting
51%
Dotchev K.
|
2008
|
tom z. 73 [253]
65-72
EN
Laser Sintering (LS) in a layer manufacturing technique and currently it is extensively used to produce concept models, functional parts, and also patterns for investment casting (IC). CastForm ™ Polystyrene(CF) is a powdered material used for fabrication of IC patterns employing the LS process. The use of the CF material is one of the fastest and most cast effective Rapid Manufacturing (RM) routes to produce small quantity wax-like patterns for shell or flask IC. The manufacture of CF casting patterns constitutes two stages. The first is the building of a "green" part and second is its infiltration with wax. The accuracy of the patterns, and ultimately the final accuracy of the metal castings, is determined by the CF material properties and the applied process parameters. The factors affecting the accuracy of the CF patterns are investigated in this paper. In addition, different ways to improve the process accuracy are discussed. An analysis of advantages and limitations of this RM technique for IC patterns fabrication is provided.
14
Content available remote Pattern evaporation process
51%
Żółkiewicz Z. , Żółkiewicz M.
|
2007
|
tom Vol. 7, iss. 2
49-52
EN
The paper discusses the process of thermal evaporation of a foundry pattern. At several research-development centres, studies have been carried out to examine the physico-chemical phenomena that take place in foundry mould filled with polystyrene pattern when it is poured with molten metal. In the technique of evaporative patterns, the process of mould filling with molten metal (the said mould holding inside a polystyrene pattern) is interrelated with the process of thermal decomposition of this pattern. The transformation of an evaporative pattern (e.g. made from foamed polystyrene) from the solid into liquid and then gaseous state occurs as a result of the thermal effect that the liquid metal exerts onto this pattern. Consequently, at the liquid metal-pattern-mould phase boundary some physico-chemical phenomena take place, which until now have not been fully explained. When the pattern is evaporating, some solid and gaseous products are evolved, e.g. CO, CO2, H2, N2, and hydrocarbons, e.g. styrene, toluene, ethane, methane, benzene [16, 23]. The process of polystyrene pattern evaporation in foundry mould under the effect of molten metal is of a very complex nature and depends on many different factors, still not fully investigated. The kinetics of pattern evaporation is also affected by the technological properties of foundry mould, e.g. permeability, thermophysical properties, parameters of the gating system, temperature of pouring, properties of pattern material, and the size of pattern-liquid metal contact surface.
15
A new approach to microwave absorbers
51%
Olszewska K. , Gwarek W.
|
2012
|
tom Vol. 53, nr 7
22-24
EN
This paper presents a new design of an absorbing screen based on a classical Salisbury concept. In the new design a resistive sheet from the classical Salisbury screen is replaced by a patterned layer. This allows eliminating major disadvantages of classical solutions, such as their narrow frequency bandwidth and high overall screen thickness. Electromagnetic simulations with QuickWave - 3D package are performed and confirm the theoretical predictions of the paper.
PL
Artykuł prezentuje nowe podejście do struktur absorbujących, oparte o klasyczne rozwiązanie typu Salisbury. W zaproponowanej strukturze, jednorodna warstwa rezystywna zastąpiona została przez warstwę wzorów. Takie rozwiązanie pozwala na wyeliminowanie głównych wad klasycznych struktur, którymi są wąskie pasmo pracy oraz duża grubość panelu. Symulacje elektromagnetyczne potwierdzające słuszność przyjętej koncepcji, przeprowadzono w programie QuickWave - 3D.
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