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Wyszukujesz frazę "Sammon's mapping" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Particle swarm optimization based fuzzy clustering approach to identify optimal number of clusters
Autorzy:
Chen, M.
Ludwig, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/91549.pdf
Data publikacji:
2014
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
optimization
fuzzy clustering
cluster analysis
particle swarm optimization (PSO)
PSO
fuzzy Sammon mapping
Sammon mapping
Opis:
Fuzzy clustering is a popular unsupervised learning method that is used in cluster analysis. Fuzzy clustering allows a data point to belong to two or more clusters. Fuzzy c-means is the most well-known method that is applied to cluster analysis, however, the shortcoming is that the number of clusters need to be predefined. This paper proposes a clustering approach based on Particle Swarm Optimization (PSO). This PSO approach determines the optimal number of clusters automatically with the help of a threshold vector. The algorithm first randomly partitions the data set within a preset number of clusters, and then uses a reconstruction criterion to evaluate the performance of the clustering results. The experiments conducted demonstrate that the proposed algorithm automatically finds the optimal number of clusters. Furthermore, to visualize the results principal component analysis projection, conventional Sammon mapping, and fuzzy Sammon mapping were used.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 1; 43-56
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Methods in Identifying Symptoms of Emotional States
Autorzy:
Piątek, Zuzanna
Kłaczyński, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/1953482.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
emotion recognition
speech signal processing
clustering analysis
Sammon mapping
Opis:
The study investigates the use of speech signal to recognise speakers’ emotional states. The introduction includes the definition and categorization of emotions, including facial expressions, speech and physiological signals. For the purpose of this work, a proprietary resource of emotionally-marked speech recordings was created. The collected recordings come from the media, including live journalistic broadcasts, which show spontaneous emotional reactions to real-time stimuli. For the purpose of signal speech analysis, a specific script was written in Python. Its algorithm includes the parameterization of speech recordings and determination of features correlated with emotional content in speech. After the parametrization process, data clustering was performed to allows for the grouping of feature vectors for speakers into greater collections which imitate specific emotional states. Using the t-Student test for dependent samples, some descriptors were distinguished, which identified significant differences in the values of features between emotional states. Some potential applications for this research were proposed, as well as other development directions for future studies of the topic.
Źródło:
Archives of Acoustics; 2021, 46, 2; 259-269
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie procesu osiadania terenu górniczego Kopalni Węgla Brunatnego Bełchatów - nowe podejście
Land subsidence modeling in mining area of open pit Brown Coal Mine Bełchatów - a new approach
Autorzy:
Palmąka, M.
Powiązania:
https://bibliotekanauki.pl/articles/2074851.pdf
Data publikacji:
2011
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Bełchatów
GIS
geostatystyka
interpolacja
modele liniowe
modele nieliniowe
osiadanie terenu
Sammon's mapping
mapy samoorganizujące się
SOM
sieci neuronowe
regresja liniowa
geostatistics
interpolation
linear models
land subsidence
self-organizing map
neural networks
multiple linear regression
Opis:
From the beginning of open-pit mining works (i.e. ground massive dewatering, access excavation, cover dumping) in 1976, which were strictly connected with an exposure a brown coal beds on Bełchatów field it was noticed, that a land surface subsided in the vicinity of Brown Coal Mine Bełchatów. Quantitative land subsidence assessments, which are based on deterministic models (elastic ground model, consolidation model), are not efficient enough to simulate the process – adjusted coefficient of determination amounts R2kor2kor
Źródło:
Przegląd Geologiczny; 2011, 59; 245-250
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The acoustic emission (AE) controlling method of the electric sheet blanking process – a comparative study of selected data mining methods
Autorzy:
Kochański, Andrzej
Czyżewski, Piotr
Moszczyński, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/29520061.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
acoustic emission
data acquisition
data preparation method
visualization method
process duration
process speed
punching
manufacturing
Andrews curves
PCA
LDA
tSNE
Sammon Mapping
emisja akustyczna
pozyskiwanie danych
metoda wizualizacji
czas trwania procesu
szybkość procesu
uderzenie
produkcja
krzywe Andrewsa
mapowanie Sammona
Opis:
The article presents an experimental stand to assess the state of punch in the process of sheet blanking. Blanking trials were carried out on an eccentric press. During all the trials, there were recorded signals of acoustic emission (AE) that accompanied the process of blanking. For the recorded AE signals, the methodology of data preparation and analysis was presented. On that basis, the results of the assessment of the state of the punch were presented, and they employed five methods of visualization: Andrews curves, Principal Components Analysis, Linear Discriminant Analysis, a modified method of Stochastic Neighbor Embedding and Sammon Mapping. The aim of the work was to assess the possibility of using visualization methods to predict the condition of the tool on the basis of acoustic emission signals in processes carried out in extremely short times.
Źródło:
Computer Methods in Materials Science; 2022, 22, 4; 189-200
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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