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Tytuł:
An Analysis of Novel Money Laundering Data Using Heterogeneous Graph Isomorphism Networks. FinCEN Files Case Study
Wykorzystanie heterogenicznych grafowych sieci izomorficznych w analizie danych związanych z praniem brudnych pieniędzy. Studium przypadku FinCEN
Autorzy:
Wójcik, Filip
Powiązania:
https://bibliotekanauki.pl/articles/38890419.pdf
Data publikacji:
2024
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
money laundering
deep learning
machine learning
network analysis
graphs
pranie brudnych pieniędzy
uczenie głębokie
analiza sieci
grafy
Opis:
Aim: This study aimed to develop and apply the novel HexGIN (Heterogeneous extension for Graph Isomorphism Network) model to the FinCEN Files case data and compare its performance with existing solutions, such as the SAGE-based graph neural network and Multi-Layer Perceptron (MLP), to demonstrate its potential advantages in the field of anti-money laundering systems (AML). Methodology: The research employed the FinCEN Files case data to develop and apply the HexGIN model in a beneficiary prediction task for a suspicious transactions graph. The model's performance was compared with the existing solutions in a series of cross-validation experiments. Results: The experimental results on the cross-validation data and test dataset indicate the potential advantages of HexGIN over the existing solutions, such as MLP and Graph SAGE. The proposed model outperformed other algorithms in terms of F1 score, precision, and ROC AUC in both training and testing phases. Implications and recommendations: The findings demonstrate the potential of heterogeneous graph neural networks and their highly expressive architectures, such as GIN, in AML. Further research is needed, in particular to combine the proposed model with other existing algorithms and test the solution on various money-laundering datasets. Originality/value: Unlike many AML studies that rely on synthetic or undisclosed data sources, this research was based on a publicly available, real, heterogeneous transaction dataset, being part of a larger investigation. The results indicate a promising direction for the development of modern hybrid AML tools for analysing suspicious transactions; based on heterogeneous graph networks capable of handling various types of entities and their connections.
Cel: Celem niniejszej analizy jest opracowanie i zastosowanie nowego modelu HexGIN (heterogeniczne rozszerzenie dla izomorfizmu sieci grafowych) do danych z dochodzenia dziennikarskiego FinCEN oraz porównanie jego jakości predykcji z istniejącymi rozwiązaniami, takimi jak sieć SAGE i wielowarstwowa sieć neuronowa (MLP). Metodyka: W badaniach wykorzystano dane ze śledztwa FinCEN do opracowania i zastosowania modelu HexGIN w zadaniu przewidywania beneficjenta sieci powiązanych transakcji finansowych. Skuteczność modelu porównano z istniejącymi rozwiązaniami wykorzystującymi sieci neuronowe grafu w serii eksperymentów z walidacją krzyżową. Wyniki: Eksperymentalne wyniki na danych walidacji krzyżowej i zestawie testowym potwierdzają potencjalne zalety HexGIN w porównaniu z istniejącymi rozwiązaniami, takimi jak MLP i SAGE. Proponowany model przewyższa inne algorytmy pod względem wyniku miary F1, precyzji i ROC AUC, w fazie zarówno treningowej, jak i testowej. Implikacje i rekomendacje: Wyniki pokazują potencjał heterogenicznych grafowych sieci i ich wysoce ekspresyjnych implementacji, takich jak GIN, w analizie transakcji finansowych. Potrzebne są dalsze badania, zwłaszcza w celu połączenia proponowanego modelu z innymi istniejącymi algorytmami i przetestowania rozwiązania na różnych zestawach danych dotyczących problemu prania brudnych pieniędzy. Oryginalność/wartość: W przeciwieństwie do wielu badań, które opierają się na syntetycznych lub nieujawnionych źródłach danych związanych z praniem brudnych pieniędzy, to studium przypadku opiera się na publicznie dostępnych, rzeczywistych, heterogenicznych danych transakcyjnych, będących częścią większego śledztwa dziennikarskiego. Wyniki wskazują obiecujący kierunek dla rozwoju nowoczesnych hybrydowych narzędzi do analizy podejrzanych transakcji, opartych na heterogenicznych sieciach grafowych.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2024, 28, 2; 32-49
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of artificial intelligence in smart healthcare systems for automatic detection of Parkinson’s Disease
Autorzy:
Pallathadka, Harikumar
Padminivalli V., S.J.R.K.
Vasavi, M.
Nancy, P.
Naved, Mohd
Kumar, Harish
Ray, Samrat
Powiązania:
https://bibliotekanauki.pl/articles/38709253.pdf
Data publikacji:
2024
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
Parkinson’s disease
detection
machine learning
relief algorithm
LDA algorithm
SVM-RBF
accuracy
sensitivity
specificity
choroba Parkinsona
wykrywanie
nauczanie maszynowe
algorytm ulgi
Algorytm LDA
dokładność
wrażliwość
specyficzność
Opis:
Parkinson’s disease is associated with memory loss, anxiety, and depression in the brain. Problems such as poor balance and difficulty during walking can be observed in addition to symptoms of impaired posture and rigidity. The field dedicated to making computers capable of learning autonomously, without having to be explicitly programmed, is known as machine learning. An approach to the diagnosis of Parkinson’s disease, which is based on artificial intelligence, is discussed in this article. The input for this system is provided through photographic examples of Parkinson’s disease patient handwriting. Received photos are preprocessed using the relief feature option to begin the process. This is helpful in the process of selecting characteristics for the identification of Parkinson’s disease. After that, the linear discriminant analysis (LDA) algorithm is employed to reduce the dimensions, bringing down the total number of dimensions that are present in the input data. The photos are then classified via radial basis function-support vector machine (SVM-RBF), k-nearest neighbors (KNN), and naive Bayes algorithms, respectively.
Źródło:
Computer Assisted Methods in Engineering and Science; 2024, 31, 2; 175-185
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artificial intelligence-powered pulse sequences in nuclear magnetic resonance and magnetic resonance imaging: historical trends, current innovations and perspectives
Autorzy:
Tokarz, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/35508129.pdf
Data publikacji:
2024
Wydawca:
Radomskie Towarzystwo Naukowe
Tematy:
artificial intelligence
machine learning
evolutionary algorithm
artificial neural network
nuclear magnetic resonance
magnetic resonance imaging
pulse sequence
shaped pulse
sztuczna inteligencja
uczenie maszynowe
algorytm ewolucyjny
sztuczna sieć neuronowa
magnetyczny rezonans jądrowy
rezonans magnetyczny
sekwencja impulsów
impuls ukształtowany
Opis:
This review article explores the historical background and recent advances in the application of artificial intelligence (AI) in the development of radiofrequency pulses and pulse sequences in nuclear magnetic resonance spectroscopy (NMR) and imaging (MRI). The introduction of AI into this field, which traces back to the late 1970s, has recently witnessed remarkable progress, leading to the design of specialized frameworks and software solutions such as DeepRF, MRzero, and GENETICS-AI. Through an analysis of literature and case studies, this review tracks the transformation of AI-driven pulse design from initial proof-of-concept studies to comprehensive scientific programs, shedding light on the potential implications for the broader NMR and MRI communities. The fusion of artificial intelligence and magnetic resonance pulse design stands as a promising frontier in spectroscopy and imaging, offering innovative enhancements in data acquisition, analysis, and interpretation across diverse scientific domains.
Źródło:
Scientiae Radices; 2024, 3, 1; 30-52
2956-4808
Pojawia się w:
Scientiae Radices
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ChatGPT – a tool for assisted studying or a source of misleading medical information? AI performance on Polish Medical Final Examination
ChatGPT – pomoc naukowa przyszłości czy źródło fałszywych informacji? Analiza odpowiedzi sztucznej inteligencji na przykładzie zadań Lekarskiego Egzaminu Końcowego
Autorzy:
Żmudka, Karol
Spychał, Aleksandra
Ochman, Błażej
Popowicz, Łukasz
Piłat, Patrycja
Jaroszewicz, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/29783504.pdf
Data publikacji:
2024-04-16
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
artificial intelligence
public health
machine learning
sztuczna inteligencja
zdrowie publiczne
nauczanie maszynowe
Opis:
INTRODUCTION: ChatGPT is a language model created by OpenAI that can engage in human-like conversations and generate text based on the input it receives. The aim of the study was to assess the overall performance of ChatGPT on the Polish Medical Final Examination (Lekarski Egzamin Końcowy – LEK) the factors influencing the percentage of correct answers. Secondly, investigate the capabilities of chatbot to provide explanations was examined. MATERIAL AND METHODS: We entered 591 questions with distractors from the LEK database into ChatGPT (version 13th February – 14th March). We compared the results with the answer key and analyzed the provided explanation for logical justification. For the correct answers we analyzed the logical consistency of the explanation, while for the incorrect answers, the ability to provide a correction was observed. Selected factors were analyzed for an influence on the chatbot’s performance. RESULTS: ChatGPT achieved impressive scores of 58.16%, 60.91% and 67.86% allowing it pass the official threshold of 56% in all instances. For the properly answered questions, more than 70% were backed by a logically coherent explanation. In the case of the wrongly answered questions the chatbot provided a seemingly correct explanation for false information in 66% of the cases. Factors such as logical construction (p < 0.05) and difficulty (p < 0.05) had an influence on the overall score, meanwhile the length (p = 0.46) and language (p = 0.14) did not. CONCLUSIONS: Although achieving a sufficient score to pass LEK, ChatGPT in many cases provides misleading information backed by a seemingly compelling explanation. The chatbot can be especially misleading for non-medical users as compared to a web search because it can provide instant compelling explanations. Thus, if used improperly, it could pose a danger to public health. This makes it a problematic recommendation for assisted studying.
WSTĘP: ChatGPT jest modelem językowym stworzonym przez OpenAI, który może udzielać odpowiedzi na zapytania użytkownika, generując tekst na podstawie otrzymanych danych. Celem pracy była ocena wyników działania ChatGPT na polskim Lekarskim Egzaminie Końcowym (LEK) oraz czynników wpływających na odsetek prawidłowych odpowiedzi. Ponadto zbadano zdolność chatbota do podawania poprawnego i wnikliwego wyjaśnienia. MATERIAŁ I METODY: Wprowadzono 591 pytań z dystraktorami z bazy LEK do interfejsu ChatGPT (wersja 13 lutego – 14 marca). Porównano wyniki z kluczem odpowiedzi i przeanalizowano podane wyjaśnienia pod kątem logicznego uzasadnienia. Dla poprawnych odpowiedzi przeanalizowano spójność logiczną wyjaśnienia, natomiast w przypadku odpowiedzi błędnej obserwowano zdolność do poprawy. Wybrane czynniki zostały przeanalizowane pod kątem wpływu na zdolność chatbota do udzielenia poprawnej odpowiedzi. WYNIKI: ChatGPT osiągnął imponujące wyniki poprawnych odpowiedzi na poziomie: 58,16%, 60,91% i 67,86%, przekraczając oficjalny próg 56% w trzech ostatnich egzaminach. W przypadku poprawnie udzielonych odpowiedzi ponad 70% pytań zostało popartych logicznie spójnym wyjaśnieniem. W przypadku błędnych odpowiedzi w 66% przypadków chatbot podał pozornie poprawne wyjaśnienie dla nieprawidłowych od-powiedzi. Czynniki takie jak konstrukcja logiczna (p < 0,05) i wskaźnik trudności zadania (p < 0,05) miały wpływ na ogólną ocenę, podczas gdy liczba znaków (p = 0,46) i język (p = 0,14) takiego wpływu nie miały. WNIOSKI: Mimo iż ChatGPT osiągnął wystarczającą liczbę punktów, aby zaliczyć LEK, w wielu przypadkach podawał wprowadzające w błąd informacje poparte pozornie przekonującym wyjaśnieniem. Chatboty mogą być szczególnym zagrożeniem dla użytkownika niemającego wiedzy medycznej, ponieważ w porównaniu z wyszukiwarką internetową dają natychmiastowe, przekonujące wyjaśnienie, co może stanowić zagrożenie dla zdrowia publicznego. Z tych samych przyczyn ChatGPT powinien być ostrożnie stosowany jako pomoc naukowa.
Źródło:
Annales Academiae Medicae Silesiensis; 2024, 78; 94-103
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditional mean embedding and optimal feature selection via positive definite kernels
Autorzy:
Jorgensen, Palle E.T.
Song, Myung-Sin
Tiang, James
Powiązania:
https://bibliotekanauki.pl/articles/29519641.pdf
Data publikacji:
2024
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
positive-definite kernels
reproducing kernel Hilbert space
stochastic processes
frames
machine learning
embedding problem
optimization
Opis:
Motivated by applications, we consider new operator-theoretic approaches to conditional mean embedding (CME). Our present results combine a spectral analysis-based optimization scheme with the use of kernels, stochastic processes, and constructive learning algorithms. For initially given non-linear data, we consider optimization-based feature selections. This entails the use of convex sets of kernels in a construction of optimal feature selection via regression algorithms from learning models. Thus, with initial inputs of training data (for a suitable learning algorithm), each choice of a kernel K in turn yields a variety of Hilbert spaces and realizations of features. A novel aspect of our work is the inclusion of a secondary optimization process over a specified convex set of positive definite kernels, resulting in the determination of “optimal” feature representations.
Źródło:
Opuscula Mathematica; 2024, 44, 1; 79-103
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring comparative statistical effectiveness of cancer subtype categorization using gene expression data
Autorzy:
Avila, Clemenshia P.
Deepa, C.
Powiązania:
https://bibliotekanauki.pl/articles/38708033.pdf
Data publikacji:
2024
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
cancer subtype
gene expression data
machine learning
Deep Flexible Neural Forest
strategy
podtyp raka
dane dotyczące ekspresji genów
nauczanie maszynowe
głęboki las neuronowy
elastyczny las neuronowy
strategia
Opis:
This work focused on the analysis of various gene expression-based cancer subtype classification approaches. Correctly classifying cancer subtypes is critical for understanding cancer pathophysiology and effectively treating cancer patients by using gene expression data to categorize cancer subtypes. When dealing with limited samples and high-dimensional biological data, most classifiers may suffer from overfitting and lower precision. The goal of this research is to develop a machine learning (ML) system capable of classifying human cancer subtypes based on gene expression data in cancer cells. These issues can be solved using ML algorithms such as Transductive Support Vector Machines (TSVM), Boosting Cascade Deep Forest (BCD Forest), Enhanced Neural Network Classifier (ENNC), Deep Flexible Neural Forest (DFN Forest), Convolutional Neural Network (CNN), and Cascade Flexible Neural Forest (CFN Forest). In inferring the benefits and rawbacks of these strategies, such as DFN Forest and CFN Forest, the findings are 95%.
Źródło:
Computer Assisted Methods in Engineering and Science; 2024, 31, 2; 261-272
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predicting housing sale prices in Germany by application of machine learning models and methods of data exploration
Przewidywanie cen mieszkań w Niemczech z wykorzystaniem modeli uczenia maszynowego i metod eksploracji danych
Autorzy:
Kim, Chong Dae
Bedorf, Nils
Powiązania:
https://bibliotekanauki.pl/articles/32041024.pdf
Data publikacji:
2024
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
uczenie maszynowe
Niemcy
ekonomia
zbiór danych o rynku nieruchomości
big data
prognozowanie cen
machine learning
Germany
economics
real estate dataset
sale price prediction
Opis:
The prediction of real estate prices is a popular problem in the field of machine learning and often demonstrated in literature. In contrast to other approaches, which regularly focus on the US market, this paper investigates the biggest, German real estate dataset, with more than 1.5 million unique samples and more than 20 features. In this paper we implement and compare different machine learning models in respect to performance and interpretability to give insight in the most important properties, which contribute to the sale price. Our experiments suggest that the prediction of sale prices in a realworld scenario is achievable yet limited by the quality of data rather than quantity. The results show promising prediction scores but are also heavily dependent on the location, which leaves room for further evaluation.
Przewidywanie cen nieruchomości jest popularnym problemem w dziedzinie uczenia maszynowego i często przedstawianym w literaturze. W przeciwieństwie do innych podejść, które koncentrują się na rynku amerykańskim, niniejszy artykuł bada największy niemiecki zbiór danych dotyczących nieruchomości, zawierający ponad 1,5 mln unikatowych próbek i ponad 20 cech. W tym artykule wdrażamy i porównujemy różne modele uczenia maszynowego pod względem wydajności i możliwości interpretacji, aby uzyskać wgląd w najważniejsze
Źródło:
Kwartalnik Nauk o Przedsiębiorstwie; 2024, 71, 1; 107-122
1896-656X
Pojawia się w:
Kwartalnik Nauk o Przedsiębiorstwie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predicting the Amount of Compensation for Harm Awarded by Courts Using Machine-Learning Algorithms
Autorzy:
Świtała, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/31341447.pdf
Data publikacji:
2024-05-26
Wydawca:
Uniwersytet Warszawski. Wydział Nauk Ekonomicznych
Tematy:
compensation amount
machine learning
harm
Polish courts
prediction
Opis:
The present study aims to explain and predict the monetary amount awarded by courts as compensation for harm suffered. A set of machine-learning algorithms was applied to a sample of decisions handed down by the Polish common courts. The methodology involved two steps: identification of words and phrases whose counts or frequencies affect the amounts adjudicated with LASSO regression and expert assessment, then applying OLS, again LASSO, random forests and XGBoost algorithms, as well as a BERT approach to make predictions. Finally, an in-depth analysis was undertaken on the influence of individual words and phrases on the amount awarded. The results demonstrate that the size of awards is most strongly influenced by the type of injury suffered, the specifics of treatment, and the family relationship between the harmed party and the claimant. At the same time, higher values are awarded when compensation for material damage and compensation for harm suffered are claimed together or when the claim is extended after it was filed.
Źródło:
Central European Economic Journal; 2024, 11, 58; 214-232
2543-6821
Pojawia się w:
Central European Economic Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study on performance of basic and ensemble classifiers with various datasets
Autorzy:
Gunakala, Archana
Shahid, Afzal Hussain
Powiązania:
https://bibliotekanauki.pl/articles/30148255.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
classification
Naïve Bayes
neural network
Support Vector Machine
Decision Tree
ensemble learning
Random Forest
Opis:
Classification plays a critical role in machine learning (ML) systems for processing images, text and high -dimensional data. Predicting class labels from training data is the primary goal of classification. An optimal model for a particular classification problem is chosen based on the model's performance and execution time. This paper compares and analyzes the performance of basic as well as ensemble classifiers utilizing 10-fold cross validation and also discusses their essential concepts, advantages, and disadvantages. In this study five basic classifiers namely Naïve Bayes (NB), Multi-layer Perceptron (MLP), Support Vector Machine (SVM), Decision Tree (DT), and Random Forest (RF) and the ensemble of all the five classifiers along with few more combinations are compared with five University of California Irvine (UCI) ML Repository datasets and a Diabetes Health Indicators dataset from Kaggle repository. To analyze and compare the performance of classifiers, evaluation metrics like Accuracy, Recall, Precision, Area Under Curve (AUC) and F-Score are used. Experimental results showed that SVM performs best on two out of the six datasets (Diabetes Health Indicators and waveform), RF performs best for Arrhythmia, Sonar, Tic-tac-toe datasets, and the best ensemble combination is found to be DT+SVM+RF on Ionosphere dataset having respective accuracies 72.58%, 90.38%, 81.63%, 73.59%, 94.78% and 94.01%. The proposed ensemble combinations outperformed the conven¬tional models for few datasets.
Źródło:
Applied Computer Science; 2023, 19, 1; 107-132
1895-3735
2353-6977
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A cough-based COVID-19 detection with gammatone and Mel-frequency cepstral coefficients
Autorzy:
Benmalek, Elmehdi
El Mhamdi, Jamal
Jilbab, Abdelilah
Jbari, Atman
Powiązania:
https://bibliotekanauki.pl/articles/2203646.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
COVID-19
cough recordings
machine learning
mel-frequency cepstral coefficients
gammatone cepstral coefficients
feature selection
uczenie maszynowe
współczynniki mel-cepstralne
Opis:
Many countries have adopted a public health approach that aims to address the particular challenges faced during the pandemic Coronavirus disease 2019 (COVID-19). Researchers mobilized to manage and limit the spread of the virus, and multiple artificial intelligence-based systems are designed to automatically detect the disease. Among these systems, voice-based ones since the virus have a major impact on voice production due to the respiratory system's dysfunction. In this paper, we investigate and analyze the effectiveness of cough analysis to accurately detect COVID-19. To do so, we distinguished positive COVID patients from healthy controls. After the gammatone cepstral coefficients (GTCC) and the Mel-frequency cepstral coefficients (MFCC) extraction, we have done the feature selection (FS) and classification with multiple machine learning algorithms. By combining all features and the 3-nearest neighbor (3NN) classifier, we achieved the highest classification results. The model is able to detect COVID-19 patients with accuracy and an f1-score above 98 percent. When applying FS, the higher accuracy and F1-score were achieved by the same model and the ReliefF algorithm, we lose 1 percent of accuracy by mapping only 12 features instead of the original 53.
Źródło:
Diagnostyka; 2023, 24, 2; art. no. 2023214
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A hybridization of machine learning and NSGA-II for multi-objective optimization of surface roughness and cutting force in AISI 4340 alloy steel turning
Autorzy:
Nguyen, Anh-Tu
Nguyen, Van-Hai
Le, Tien-Thinh
Nguyen, Nhu-Tung
Powiązania:
https://bibliotekanauki.pl/articles/2200263.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
multi-objective optimisation
machine learning
AISI 4340
NSGA-II
ANN
Opis:
This work focuses on optimizing process parameters in turning AISI 4340 alloy steel. A hybridization of Machine Learning (ML) algorithms and a Non-Dominated Sorting Genetic Algorithm (NSGA-II) is applied to find the Pareto solution. The objective functions are a simultaneous minimum of average surface roughness (Ra) and cutting force under the cutting parameter constraints of cutting speed, feed rate, depth of cut, and tool nose radius in a range of 50–375 m/min, 0.02–0.25 mm/rev, 0.1–1.5 mm, and 0.4–0.8 mm, respectively. The present study uses five ML models – namely SVR, CAT, RFR, GBR, and ANN – to predict Ra and cutting force. Results indicate that ANN offers the best predictive performance in respect of all accuracy metrics: root-mean-squared-error (RMSE), mean-absolute-error (MAE), and coefficient of determination (R2). In addition, a hybridization of NSGA-II and ANN is implemented to find the optimal solutions for machining parameters, which lie on the Pareto front. The results of this multi-objective optimization indicate that Ra lies in a range between 1.032 and 1.048 μm, and cutting force was found to range between 7.981 and 8.277 kgf for the five selected Pareto solutions. In the set of non-dominated keys, none of the individual solutions is superior to any of the others, so it is the manufacturer's decision which dataset to select. Results summarize the value range in the Pareto solutions generated by NSGA-II: cutting speeds between 72.92 and 75.11 m/min, a feed rate of 0.02 mm/rev, a depth of cut between 0.62 and 0.79 mm, and a tool nose radius of 0.4 mm, are recommended. Following that, experimental validations were finally conducted to verify the optimization procedure.
Źródło:
Journal of Machine Engineering; 2023, 23, 1; 133--153
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel framework for fetal nuchal translucency abnormality detection using hybrid maxpool matrix histogram analysis
Autorzy:
Verma, Deept
Agrawal, Shweta
Powiązania:
https://bibliotekanauki.pl/articles/38703226.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
nuchal translucency
genetic disorders
hybrid maxpool matrix histogram analysis
pregnant women
machine learning
przezierność karku
zaburzenia genetyczne
analiza histogramu hybrydowej macierzy Maxpool
kobiety w ciąży
nauczanie maszynowe
Opis:
Birth defects affect 1 to 3 percent of the population and are mostly detected in pregnantwomen through double, triple, and quadruple testing. Ultrasonography helps to discoverand define such anomalies in fetuses. Ultrasound pictures of nuchal translucency (NT)are routinely used to detect genetic disorders in fetuses. The NT area lacks identifiablelocal behaviors and detection algorithms are required to classify the fetal head. On theother hand, explicit identification of other body parts comes at a higher cost in termsof annotations, implementation, and analysis. In circumstances of ambiguous head placement or non-standard head-NT relationships, it may potentially cause cascading errors.In this research work, a linear contour size filter is used to decrease noise from the image,and then the picture is scaled. Then, a novel hybrid maxpool matrix histogram analysis (HMMHA) is proposed to enhance the initiation and progression. The training andassessment were conducted using a dataset of 33 ultrasound pictures. Extensive testingshows that the direct method reliably identifies and measures NT. The suggested modelmay assist doctors in making decisions about pregnancies with fetal growth restriction,particularly for patients who have nuchal translucency or congenital anomalies and donot require induced labor due to these abnormalities. The performance of the proposedtechnique is analyzed in terms of error rate, sensitivity, Matthews correlation coefficient(MCC), accuracy, precision, recall, and F1-score. The error rate of the proposed model is28.21% and it is found to be better when compared with the conventional approaches. Finally, the error prediction is compared with the existing models obtained from the medicaldataset of pregnant women to identify fetal abnormality positions.
Źródło:
Computer Assisted Methods in Engineering and Science; 2023, 30, 3; 277-290
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A probabilistic approach for approximation of optical and opto-electronic properties of an opto-semiconductor wafer under consideration of measuring inaccuracy and model uncertainty
Autorzy:
Stroka, Stefan M.
Heumann, Christian
Suhrke, Fabian
Meindl, Kathrin
Powiązania:
https://bibliotekanauki.pl/articles/2204192.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
Gaussian process regression
machine learning
uncertainty quantification
photoluminescence
opto-semiconductor wafer measuring
Opis:
This paper presents a probabilistic machine learning approach to approximate wavelength values for unmeasured positions on an opto-semiconductor wafer after epitaxy. Insufficient information about optical and opto-electronic properties may lead to undetected specification violations and, consequently, to yield loss or may cause product quality issues. Collection of information is restricted because physical measuring points are expensive and in practice samples are only drawn from 120 specific positions. The purpose of the study is to reduce the risk of uncertainties caused by sampling and measuring inaccuracy and provide reliable approximations. Therefore, a Gaussian process regression is proposed which can determine a point estimation considering measuring inaccuracy and further quantify estimation uncertainty. For evaluation, the proposed method is compared with radial basis function interpolation using wavelength measurement data of 6-inch InGaN wafers. Approximations of these models are evaluated with the root mean square error. Gaussian process regression with radial basis function kernel reaches a root mean square error of 0.814 nm averaged over all wafers. A slight improvement to 0.798 nm could be achieved by using a more complex kernel combination. However, this also leads to a seven times higher computational time. The method further provides probabilistic intervals based on means and dispersions for approximated positions.
Źródło:
Opto-Electronics Review; 2023, 31, 2; art. no. e145863
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A short technical review on Digital Twins in smart manufacturing
Autorzy:
Korkmaz, Mehmet Erdi
Powiązania:
https://bibliotekanauki.pl/articles/34656171.pdf
Data publikacji:
2023
Wydawca:
Politechnika Opolska
Tematy:
digital twin
smart manufacturing
machine learning
Internet of things
Opis:
The most recent tendencies and breakthroughs in digital technologies have made it possible to implement a new model of manufacturing. By es-tablishing a digital twin of the real environment and basing their judg-ments on that twin, digital systems are able to monitor, optimize, and man-age the processes that they are applied to. This concept is predicated on the creation of a “Digital Twin” for each individual production source that contributes to the overall manufacturing process. In spite of the fact that different real-world applications of digital twin may involve different tech-nical and operational specifics, a significant amount of work was put in over the past few years to recognize and express principal properties, in addition to the primary challenges involved in the practical implementa-tion of digital twins within related industries. The purpose of this article is to review and analyze the fundamental principles, ideas, and technological solutions that comprise the Digital Twin vision for production processes. As a result, the objective of this review is to provide a synopsis of the state-of-the-art regarding digital twin concepts and to analyze their most recent status in terms of their potential application and implementation.
Źródło:
Sustainable Production, Instrumentation and Engineering Sciences; 2023, 1, 1; 1-7
2956-6711
Pojawia się w:
Sustainable Production, Instrumentation and Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An advanced ensemble modeling approach for predicting carbonate reservoir porosity from seismic attributes
Autorzy:
Topór, Tomasz
Sowiżdżał, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/27310145.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
machine learning
model stacking
ensemble method
carbonates
seismic attributes
porosity prediction
Opis:
This study uses a machine learning (ML) ensemble modeling approach to predict porosity from multiple seismic attributes in one of the most promising Main Dolomite hydrocarbon reservoirs in NW Poland. The presented workflow tests five different model types of varying complexity: K-nearest neighbors (KNN), random forests (RF), extreme gradient boosting (XGB), support vector machine (SVM), single layer neural network with multilayer perceptron (MLP). The selected models are additionally run with different configurations originating from the pre-processing stage, including Yeo–Johnson transformation (YJ) and principal component analysis (PCA). The race ANOVA method across resample data is used to tune the best hyperparameters for each model. The model candidates and the role of different pre-processors are evaluated based on standard ML metrics – coefficient of determination (R2), root mean squared error (RMSE), and mean absolute error (MAE). The model stacking is performed on five model candidates: two KNN, two XGB, and one SVM PCA with a marginal role. The results of the ensemble model showed superior accuracy over single learners, with all metrics (R2 0.890, RMSE 0.0252, MAE 0.168). It also turned out to be almost three times better than the neural net (NN) results obtained from commercial software on the same testing set (R2 0.318, RMSE 0.0628, MAE 0.0487). The spatial distribution of porosity from the ensemble model indicated areas of good reservoir properties that overlap with hydrocarbon production fields. This observation completes the evaluation of the ensemble technique results from model metrics. Overall, the proposed solution is a promising tool for better porosity prediction and understanding of heterogeneous carbonate reservoirs from multiple seismic attributes.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 3; 245--260
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł

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