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Tytuł:
An experimental study of the vibrational characteristics of a diamond circular blade using electronic speckle-pattern interferometry and fem
Autorzy:
Tkach, Mykhaylo
Halynkin, Yurii
Proskurin, Arkadii
Zhuk, Irina
Kluchnyk, Volodymyr
Bobylev, Igor
Powiązania:
https://bibliotekanauki.pl/articles/1837945.pdf
Data publikacji:
2021
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
interferometry
speckle pattern
correlation fringes
vibration analysis
Opis:
The compact installation and technology for determining vibration characteristics by the ESPI method has been created. The experimental determination of the dynamic characteristics of a diamond circular blade with a diameter of 203.4 mm and a thickness of 1.19 mm using real-time electronic speckle interferometry is presented. 15 mode shapes of vibration were detected in the range from 100 to 5000 Hz. The program calculation of the natural frequencies and mode shapes is carried out for three values of the clamping inner diameter (42 mm, 44 mm, 46 mm). The options for calculating a disk with a rim and without a rim are considered. It is shown that the minimum mean squared error of the calculation is achieved for the values of the diameter of the disk 46 mm, 42 mm and 44 mm for the number of nodal circles 0, 1 and 2, respectively. To verify the accuracy of the interferometer, experimental, computational and analytical studies of console steel rod 200 x 22.25 x 3.78 mm in size were carried out.
Źródło:
Acta Mechanica et Automatica; 2021, 15, 1; 16-23
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intelligent pattern recognition of SLM machine energy data
Autorzy:
Uhlmann, E.
Pastl Pontes, R.
Laghmouchi, A.
Hohwieler, E.
Feitscher, R.
Powiązania:
https://bibliotekanauki.pl/articles/99469.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
pattern recognition
data analysis
additive manufacturing
energy data
Opis:
Selective Laser Melting (SLM) is an additive manufacturing process, in which the research has been increasing over the past few years to meet customer-specific requirements. Different parameters from the process and the machine components have been monitored in order to obtain vital information such as productivity of the machine and quality of the manufactured workpiece. The monitoring of parameters related to energy is also realized, but the utilisation of such data is usually performed for determining basic information, for instance, from energy consumption. By applying machine learning algorithms on these data, it is possible to identify not only the steps of the manufacturing process, but also its behaviour patterns. Along with these algorithms, evidences regarding the conditions of components and anomalies can be detected in the acquired data. The results can be used to point out the process errors and component faults and can be adopted to analyse the energy efficiency of the SLM process by comparing energy consumption of one single layer during the manufacturing of different components. Moreover, the state of the manufacturing process and the machine can be determined automatically and applied to predict failures in order to launch appropriate counter measures.
Źródło:
Journal of Machine Engineering; 2017, 17, 2; 65-76
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification of vehicles in motion based on ground vibration
Autorzy:
Bartmański, C.
Powiązania:
https://bibliotekanauki.pl/articles/114089.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
vibroacoustics
digital signal processing
wavelet analysis
pattern recognition
Opis:
The paper presents a method of measuring the structure of traffic, based on the ground vibration generated by moving vehicles. The measuring system, which uses the presented method, works according to a classical model of pattern recognition process. The method of extracting features based on the wavelet transform was developed. The choice of the classifier’s algorithm was made experimentally. The algorithms were tested using signal recordings performed in typical road conditions.
Źródło:
Measurement Automation Monitoring; 2015, 61, 3; 72-75
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Building an ontology for system analysis
Autorzy:
Burov, Y.
Pasichnyk, A.
Katrenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/411235.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
system analysis
ontology
pattern
model
concept
semantic grid
Opis:
System analysis as scientific and engineering discipline underpins research and development in other areas. However, system analysis models and methods are often taught separately and, as a result, system analyst cannot form a holistic understanding of this area. In order to deepen our understanding of system analysis’ concepts and relations the ontology of this area was built. It was constructed based on models and methods of system analysis considered as knowledge patterns. The concept of system was selected as a central concept of ontology. Other important concepts, such as goal, function, decision and process are relating to it. Finally, the applications of created system analysis ontology for teaching system analysis in high school and as a part of semantic grid are discussed.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 3; 3-6
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Don’t fight the tape! Technical Analysis Momentum and Contrarian Signals as Common Cognitive Biases
Autorzy:
Zielonka, Piotr
Białaszek, Wojciech
Biedrzycki, Paweł
Dzik, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/1933544.pdf
Data publikacji:
2020-02
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
technical analysis
pattern recognition
cognitive biases
momentum
contrarian
Opis:
Purpose: Stock market participants use technical analysis to seek trends in stock price charts despite its doubtful efficiency. We tested whether technical analysis signals represent typical and common cognitive biases associated with the continuation or reversal of the trend. Methodology: We compared investors’ opinions about the predictive power of technical analysis signals grouped into five conditions: real technical analysis signals associated with trend continuation (real momentum signals) or trend reversal (real contrarian signals), fake momentum or fake contrarian signals, and fluctuation signals. Findings: Investors assigned larger predictive power to real and fake signals associated with trend continuation than to signals associated with trend reversal. Fake signals, which represented cognitive biases, elicited similar predictions about trend continuation or reversal to real technical analysis signals. Originality: Market players assess momentum signals to have greater predictive power than contrarian signals and neutral signals to have the least predictive power. These results are independent of whether technical analysis signals were well-known to investors or made up by experimenters. The hardwired propensity of our brains to detect patterns combined with the non-natural environment of the stock market creates the illusion of expertise that is not easy to dispel.
Źródło:
Central European Management Journal; 2020, 28(2); 98-110
2658-0845
2658-2430
Pojawia się w:
Central European Management Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane parametry stereologiczne w identyfikacji struktur przepływu mieszaniny dwufazowej gaz-ciecz
Selected stereological parameters for the identification of two-phase gas - liquid mixture flow structures
Autorzy:
Masiukiewicz, M.
Ulbrich, R.
Powiązania:
https://bibliotekanauki.pl/articles/2072208.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
analiza stereologiczna
struktura przepływu dwufazowego
identyfikacja struktury
stereological analysis
two-phase flow pattern
pattern recognition
Opis:
Ukazano zastosowanie metody identyfikacji struktury mieszaniny wielofazowej opartej na analizie obrazu metodami stereologicznymi. Badania realizowano w kanale prostokątnym szczelinowym i czterech minikanałach dla pionowego współprądowego przepływu mieszaniny powietrzno-wodnej. Obliczono pięć parametrów stereologicznych, na podstawie których dokonano ilościowej i jakościowej oceny struktury. Informacje te umożliwiają sprawowanie kontroli nad urządzeniem, w którym taki przepływ zachodzi.
The paper illustrates the method of multi-phase mixture structure identification based on image analysis with stereological methods. The study was conducted in a rectangular slot channel and in minichannels for vertical co- current flow of air - water mixture. The quantitative and qualitative assessment of flow structure was calculated on basis of five specific stereological parameters. These information enable the control of device in which the flow occurs.
Źródło:
Inżynieria i Aparatura Chemiczna; 2013, 5; 445--446
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hidden Context Influence on Pattern Recognition
Autorzy:
Kulikowski, J. L.
Powiązania:
https://bibliotekanauki.pl/articles/307822.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
decision making
hidden information
intuition
pattern recognition
scene analysis
Opis:
The influence of hidden additional information concerning the circumstances of input data acquisition on the quality of decisions based on the data is considered. An analogue to the intuition influencing natural decision making is indicated. The problem of contextual information in decision making based on Bayes rule, on reference data sets in various applications as well as of scene analysis by numerous examples is illustrated.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 1; 72-78
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vorschlag als Sprachhandlungsmuster: Methodologie der kontrastiven Analyse am Beispiel des deutsch-polnischen Sprachvergleichs
The speech behaviour pattern of PROPOSAL: Methodology of contrastive analysis presented on the example of the German-Polish language comparison
Autorzy:
Kotorova, Elizaveta
Zuchewicz, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/517805.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Wrocławski. Oficyna Wydawnicza ATUT – Wrocławskie Wydawnictwo Oświatowe
Tematy:
speech behaviour pattern
proposal
German
Polish
contrastive
analysis
intercultural communication
Opis:
The present paper aims to describe the speech behaviour pattern of PROPOSAL in German and Polish. The term “speech behaviour pattern” refers to the purposeful verbal behaviour. The illocutionary content of PROPOSAL is determined in accordance with the theory of semantic primes. The contrastive analysis has the following three aspects. First, typical implementation forms of this speech behaviour pattern are described in both languages. Then, their use in concrete functional and communicative contexts is exemplified. Finally, the composition of the communicative-pragmatic field of PROPOSAL is analysed in German and Polish. Particular attention is given to the central and peripheral forms of implementation as well as to the similarities and differences in the formulation of utterances expressing PROPOSAL in German and Polish.
Źródło:
Beiträge zur allgemeinen und vergleichenden Sprachwissenschaft; 2018, 7; 57-87
2657-4799
Pojawia się w:
Beiträge zur allgemeinen und vergleichenden Sprachwissenschaft
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stable or not stable? Recognizing surge based on the pressure signal
Autorzy:
Garcia, D.
Liśkiewicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/175253.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
singular spectrum analysis
nonlinear dynamics
statistical pattern recognition
compressor
surge
Opis:
The surge protection may be worth millions of dollars. This is typical price of a centrifugal compressor repair combined with additional cost of nonfunctionality of an industry employing it. This threat is normally secured by application of an antisurge systems. Typically they are activated at predefined working conditions when compressor mass flow rate approaches region affected by the surge. As a result those systems are vastly limiting its operational range usually by a desirable region where compressor attains large pressure ratio. Therefore, a modern antisurge systems are aiming at diminishing this tradeoff by reacting to the real pressure signal gathered at high frequency. This paper presents one of those methods employing singular spectrum analysis. This algorithm has not been widely used for this application, while it was shown herein that it may bring clear distinction between stable and nonstable working condition, even at presurge conditions. Hence in further perspective it may bring anti-surge protection quality, that was not met with another methods.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 55-68
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poszukiwanie odpowiedniości elementów obrazów poprzez poszukiwanie klik optymalnych
Image element matching by optimal clique findingInstytut
Autorzy:
Bal, A.
Powiązania:
https://bibliotekanauki.pl/articles/156849.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
elementy obrazu
poszukiwanie wzorca
graf
image analysis
pattern definition
graph
Opis:
W pracy przedstawiono idee trzech nowych, wykorzystujących informację o strukturze, metod poszukiwania niedokładnej odpowiedniości elementów obrazów. Metodami tymi są metoda: jednokrokowa, iteracyjna i wieloetapowa. Problem poszukiwania odpowiedniości elementów obrazów został w nich sprowadzony do problemu określenia niedokładnej odpowiedniości odpowiednio zdefiniowanych grafów. Na potrzeby rozwiązania tego zadnia opracowano metodę poszukiwania odpowiedniości grafów przez poszukiwanie klik optymalnych. Jako przykład zastosowania prezentowanych metod przedstawiono ich wykorzystanie w zadaniu poszukiwania stereokorespondencji.
In this paper the idea of three novel (i.e. one-step, iterative and multistage method), using structural information, methods for finding inexact correspondence of image elements is presented. In those methods the task of matching image elements is reduced to the problem of inexact graph matching in accordingly defined graphs. For this problem solving new method of finding graph matching by optimal clique finding in respectively defined association graph was developed. As an example of practical usage of the described methods, their application in problem of stereomatching is presented.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 8, 8; 3-6
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regionalisation of watersheds with respect to low flow
Autorzy:
Cupak, Agnieszka
Michalec, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/2174343.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
cluster analysis
low flow
regional regression
residual pattern approach
watershed
Opis:
The aim of the study was to compare two grouping methods for regionalisation of watersheds, which are similar in respect of low flow and chosen catchments parameters (physiographic and meteorological). In the study, a residual pattern approach and cluster analysis, i.e. Ward’s method, were used. The analysis was conducted for specific low flow discharge q95 (dm3∙s-1∙km-2). In the analysis, 50 catchments, located in the area of the upper and central Vistula River basin, were taken. Daily flows used in the study were monitored from 1976 to 2016. Based on the residual pattern approach (RPA) method, the analysed catchments were classified into two groups, while using the cluster analysis method (Ward’s method) - into five. The predictive performance of the complete regional regression model checked by cross-validation R2cv was 47% and RMSEcv= 0.69 dm3∙s-1∙km-2. The cross validation procedure for the cluster analysis gives a predictive performance equal to 33% and RMSEcv= 0.81 dm3∙s-1∙km-2. Comparing both methods, based on the cross-validated coefficient of determination (R2cv), it was found that the residual pattern approach had a better fit between predicted and observed values. The analysis also showed, that in case of both methods, an overestimation of specific low flow discharge q95 was observed. For the cross-validation method and the RPA method, the PBIAS was -10%. A slightly higher value was obtained for the cross-validation method and models obtained using cluster analysis for which the PBIAS was -13.8%.
Źródło:
Journal of Water and Land Development; 2022, 55; 47--55
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disparities in the level of regional technical infrastructure development in Poland: multicriteria analysis
Autorzy:
Miłek, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/22443135.pdf
Data publikacji:
2022
Wydawca:
Instytut Badań Gospodarczych
Tematy:
regional infrastructure
regional disparities
Poland’s voivodeships
taxonomic analysis
multicriteria analysis
Hellwig development pattern method
Opis:
Research background: The development policy currently promoted by the European Union is focused on the use of the territory?s internal resources. Among the factors affecting regional development, by building its potential, infrastructure, being a basic necessity for developing activity in a given area, is of significant importance. Hence, investment in infrastructure is critical to stimulating economic dynamism, as it is the basis for supporting a variety of measures aimed at economic growth. Purpose of the article: This paper aims to evaluate the level of development of technical infrastructure and changes taking place in this field in Polish voivodeships in 2008 and 2020. Methods: The study was carried out using the Hellwig development pattern method and a comparative analysis of the technical infrastructure of Polish regions. The above approach makes it possible to measure the diversity of the state and availability of infrastructure for the communities of the regions. Findings & value added: While implementing the study aim, particular attention was paid to the spatial differences in the level of development of the technical infrastructure of Polish voivodeships. The analysis enabled to distinguish groups of voivodeships with the highest, high, low, and very low level of technical infrastructure development. From a long-term perspective, the conducted research can be seen as a contribution to existing research and serve to further compare the impact of technical infrastructure on the economic development of countries. The strength of the study is the adequately long time span of the analysis (2008 ? the period of the financial crisis and 2020 ? the COVID 2019 pandemic), which provides a basis for the formation of the infrastructure in question. The added value of the article is also a regional perspective on the level of development of technical infrastructure using multidimensional methods of statistical analysis. The results of the study can be used to make decisions at the national level regarding the retrofitting of infrastructure in regions with a low level of infrastructure development. For the European Union's decision-makers they can be a source of knowledge of where to direct EU funds the purpose of which is the infrastructural development of regions.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2022, 17, 4; 1087-1113
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in gait pattern in patients with scoliosis
Zmiany stereotypu chodu u pacjentów z bocznym skrzywieniem kręgosłupa
Autorzy:
Syczewska, Małgorzata
Łukaszewska, Anna
Górak, Beata
Graff, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1937268.pdf
Data publikacji:
2006
Wydawca:
Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
Tematy:
Scoliosis
gait analysis
gait pattern
skrzywienie kręgosłupa
analiza chodu
stereotyp chodu
Opis:
Introduction. Scoliosis is the most common orthopaedic disorder among children and adolescents thus constituting a serious social problem. 3D deformation of the spine changes the mechanics of the whole body. The aim of this work was to assesschanges in gait pattern in patients with scoliosis.Material and methods. Patients: 25 girls aged 12-16 years with idiopathic scoliosis greater than 20 degrees, not treated earlier. Method: objective gait analysis using the system VICON 460 synchronized with dynamic electromyography system and dynamographic platform. Measured parameters: spatio-temporal, kinematic, surface EMG of selected limb and trunk muscles. Calculations were performed with Polygon software.Results. Decreased pelvic tilt was found in 90 % of patients, together with an increased pelvic tilt range. In 2/3 of patients, the pelvis was obliqued in the frontal plane, and in the majority, the pelvis was rotated in the transverse plane with respect to the line of progression. The orientation of the hip joints in the frontal and transverse planes was incorrect in half of the patients, and the knees were slightly flexed at initial contact. In some patients, there was a diminished range of motion of the hip joints in the saggital plane, accompanied by an increased internal pelvic rotation at the initial contact. In all patients, the feet were dorsiflexed in the ankle joints in the swing phase, and in the transverse plane, there was an internal rotation of the feet with respect to the shank. In all patients, there was also an abnormal, asymmetrical activity of the trunk muscles, and of the greatest gluteal muscles.Conclusions. Scoliosis changes body mechanics and the orientation of the pelvis at least in one plane (in most cases – in all three planes). Compensatory mechanisms occur that may lead to further pathologies. The increased dorsiflexion of the feet in the swing phase was a surprising finding. As the maximum flexion of the knees in this phase is correct, the increased dorsiflexion could not have served as a compensatory mechanism helping in foot clearance.
Wstęp. Boczne skrzywienie kręgosłupa to najczęściej występujące wśród dzieci i młodzieŜy schorzenie ortopedyczne, stanowiące poważny problem społeczny. Wielopłaszczyznowa deformacja kręgosłupa zaburza mechanikę ciała. Celem pracy była ocena zmian stereotypu chodu u pacjentów z bocznym skrzywieniem kręgosłupa. Materiał i metody. 25 dziewcząt w wieku 12-16 lat z bocznym idiopatycznym skrzywieniem kręgosłupa powyżej 20 stopni, nie leczonych wcześniej. Metody: analiza chodu za pomocą systemu VICON 460 z systemem do elektromiografii dynamicznej oraz z platformą dynamograficzną. Mierzono parametry czasowo-przestrzenne, kinematyczne oraz EMG wybranych mięśni kończyn dolnych i tułowia. Obliczenia wykonano za pomocą programu Polygon. Wyniki. U 90% pacjentek stwierdzono zmniejszone przodopochylenie miednicy, zwiększony zakres ruchu miednicy w pł. strzałkowej. U 2/3 miednica była ustawiona skośnie w pł. czołowej, a u większości takŜe skręcona względem linii kierunkowej chodu w pł. poprzecznej. U połowy ustawienie stawów biodrowych w pł. czołowej i poprzecznej było nieprawidłowe, a kontakt z podłożem odbywał się przy lekko zgiętych kolanach. U części pacjentek stwierdzono zmniejszenie zakresu ruchu w stawach biodrowych w pł. strzałkowej, ze zwiększoną rotacją wewnętrzną miednicy w chwili kontaktu z podłożem. U wszystkich stwierdzono zgięcie grzbietowe stóp w fazie wymachu oraz wewnętrzną rotację stóp względem goleni, a takŜe nieprawidłowy, asymetryczny zapis EMG mm. pośladkowych wielkich oraz wzdłuż kręgosłupa. Wnioski. Boczne skrzywienie kręgosłupa zaburza mechanikę ciała, zmienia orientację miednicy podczas chodu przynajmniej w jednej płaszczyźnie, w większości przypadków we wszystkich trzech. Pojawiają się mechanizmy kompensacyjne, które mogą stać się źródłem kolejnych nieprawidłowości. Zaskakującym zjawiskiem jest zgięcie grzbietowe stóp w fazie wymachu. PoniewaŜ u wszystkich pacjentek zgięcie kolan w fazie wymachu jest prawidłowe nie może to być mechanizm ułatwiający przenoszenie kkd nad podłoŜem.
Źródło:
Medical Rehabilitation; 2006, 10(4); 18-24
1427-9622
1896-3250
Pojawia się w:
Medical Rehabilitation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
L1-optimal Statistical Discrimination Procedures and their Asymptotic Properties
Autorzy:
Niemiro, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/747673.pdf
Data publikacji:
1989
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Classification and discrimination, cluster analysis
Asymptotic distribution theory
Pattern recognition, speech recognition
Opis:
W pracy rozpatruje się procedury statystyczne, które można traktować jako procedury estymacji rozwiązania problemu minimalizacji kiedy łączny rozkład prawdopodobieństwa zmiennych losowych jest nieznany i może być oszacowany na podstawie próby losowej. Procedury takiego typu pojawiają się w teorii dyskryminacji statystycznej i odsiewania. Przedmiotem pracy jest badanie asymptotycznych własności takich procedur.
We consider the generalized Z^-norm optimization problem assuming that the joint probability distri-bution of random variables is unknown. The solution to the problem has, therefore, to be estimated from a sample. We examine a natural estimator and show its strong consistency and asymptotic normality under quite general assumptions. Certain discrimination and screening problems, formalized in decision- theoretical manner, can be solved using Z^-norm minimization procedures. We derive asymptotic expansions of risk corresponding to estimated solu-tions.
Źródło:
Mathematica Applicanda; 1989, 17, 31
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Could k-NN classifier be Useful in tree leaves recognition?
Autorzy:
Horaisová, K.
Powiązania:
https://bibliotekanauki.pl/articles/229900.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
binary image
Fourier transform
affine invariance
harmonic analysis
pattern recognition
k-NN classifier
Opis:
This paper presents a method for affine invariant recognition of two-dimensional binary objects based on 2D Fourier power spectrum. Such function is translation invariant and their moments of second order enable construction of affine invariant spectrum except of the rotation effect. Harmonic analysis of samples on circular paths generates Fourier coefficients whose absolute values are affine invariant descriptors. Affine invariancy is approximately saved also for large digital binary images as demonstrated in the experimental part. The proposed method is tested on artificial data set first and consequently on a large set of 2D binary digital images of tree leaves. High dimensionality of feature vectors is reduced via the kernel PCA technique with Gaussian kernel and the k-NN classifier is used for image classification. The results are summarized as k-NN classifier sensitivity after dimensionality reduction. The resulting descriptors after dimensionality reduction are able to distinguish real contours of tree leaves with acceptable classification error. The general methodology is directly applicable to any set of large binary images. All calculations were performed in the MATLAB environment.
Źródło:
Archives of Control Sciences; 2014, 24, 2; 177-192
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 16-30 z 66

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