69 research outputs found
Diagnosis of Bearing Damage in Mechanical Equipment Combining Fuzzy Logic Variable Phase Layered Algorithm
The paper aims at the problem that the bearing of mechanical equipment affects the safe, stable and efficient operation of mechanical equipment. In this paper, a fuzzy logic variable phase layered algorithm (flvpla) is proposed. The dimension reduction is realized by calculating the vibration signal. The vibration signal is effectively used to diagnose bearing fault, and the signal value is reduced to conduction fault classification. Finally, the experimental results show that the dimension reduction effect based on flvpla is better than that based on principal component analysis (PCA) algorithm and LTSA. The fault recognition rate of ba-svm is significantly higher than that of genetic algorithm optimized support vector machine (GA-SVM) and particle swarm optimization support vector machine (PSO-SVM). Therefore, the combination of flvpla and ba-svm can obtain higher recognition accuracy
Review of Machine Learning Approaches In Fault Diagnosis applied to IoT System
International audienceWith increasing complex systems, low production costs, and changing technologies, for this reason, the automatic fault diagnosis using artificial intelligence (AI) techniques is more in more applied. In addition, with the emergence of the use of reconfigurable systems, AI can assist in self-maintenance of complex systems. The purpose of this article is to summarize the diagnosis research of systems using AI approaches and examine their application particularly in the field of diagnosis of complex systems. It covers articles published from 2002 to 2018 using Machine Learning tools for fault diagnosis in industrial systems
Weakly- and Semi-Supervised Probabilistic Segmentation and Quantification of Ultrasound Needle-Reverberation Artifacts to Allow Better AI Understanding of Tissue Beneath Needles
Ultrasound image quality has continually been improving. However, when
needles or other metallic objects are operating inside the tissue, the
resulting reverberation artifacts can severely corrupt the surrounding image
quality. Such effects are challenging for existing computer vision algorithms
for medical image analysis. Needle reverberation artifacts can be hard to
identify at times and affect various pixel values to different degrees. The
boundaries of such artifacts are ambiguous, leading to disagreement among human
experts labeling the artifacts. We propose a weakly- and semi-supervised,
probabilistic needle-and-reverberation-artifact segmentation algorithm to
separate the desired tissue-based pixel values from the superimposed artifacts.
Our method models the intensity decay of artifact intensities and is designed
to minimize the human labeling error. We demonstrate the applicability of the
approach and compare it against other segmentation algorithms. Our method is
capable of differentiating between the reverberations from artifact-free
patches as well as of modeling the intensity fall-off in the artifacts. Our
method matches state-of-the-art artifact segmentation performance and sets a
new standard in estimating the per-pixel contributions of artifact vs
underlying anatomy, especially in the immediately adjacent regions between
reverberation lines. Our algorithm is also able to improve the performance
downstream image analysis algorithms
Hierarchical representation for PPI sites prediction
Background: Protein–protein interactions have pivotal roles in life processes, and aberrant interactions are associated with various disorders. Interaction site identification is key for understanding disease mechanisms and design new drugs. Effective and efficient computational methods for the PPI prediction are of great value due to the overall cost of experimental methods. Promising results have been obtained using machine learning methods and deep learning techniques, but their effectiveness depends on protein representation and feature selection. Results: We define a new abstraction of the protein structure, called hierarchical representations, considering and quantifying spatial and sequential neighboring among amino acids. We also investigate the effect of molecular abstractions using the Graph Convolutional Networks technique to classify amino acids as interface and no-interface ones. Our study takes into account three abstractions, hierarchical representations, contact map, and the residue sequence, and considers the eight functional classes of proteins extracted from the Protein–Protein Docking Benchmark 5.0. The performance of our method, evaluated using standard metrics, is compared to the ones obtained with some state-of-the-art protein interface predictors. The analysis of the performance values shows that our method outperforms the considered competitors when the considered molecules are structurally similar. Conclusions: The hierarchical representation can capture the structural properties that promote the interactions and can be used to represent proteins with unknown structures by codifying only their sequential neighboring. Analyzing the results, we conclude that classes should be arranged according to their architectures rather than functions
Minimally Supervised Learning using Topological Projections in Self-Organizing Maps
Parameter prediction is essential for many applications, facilitating
insightful interpretation and decision-making. However, in many real life
domains, such as power systems, medicine, and engineering, it can be very
expensive to acquire ground truth labels for certain datasets as they may
require extensive and expensive laboratory testing. In this work, we introduce
a semi-supervised learning approach based on topological projections in
self-organizing maps (SOMs), which significantly reduces the required number of
labeled data points to perform parameter prediction, effectively exploiting
information contained in large unlabeled datasets. Our proposed method first
trains SOMs on unlabeled data and then a minimal number of available labeled
data points are assigned to key best matching units (BMU). The values estimated
for newly-encountered data points are computed utilizing the average of the
closest labeled data points in the SOM's U-matrix in tandem with a topological
shortest path distance calculation scheme. Our results indicate that the
proposed minimally supervised model significantly outperforms traditional
regression techniques, including linear and polynomial regression, Gaussian
process regression, K-nearest neighbors, as well as deep neural network models
and related clustering schemes
A Proposed Scheme for Fault Discovery and Extraction Using ANFIS: Application to Train Braking System
This paper showcases the use of model oriented techniques for real time fault discovery and extraction on train track unit. An analytical system model is constructed and simulated in Mathlab to showcase the fair and unfair status of the system. The discovery and extraction phases are centered on a hybrid adaptive neuro-fuzzy inference feature extraction and segregated module. Output module interprites zero (0) as a good status of the traintrack unit and one (1) as an unpleasant status. Final results showcase the robustness and ability to discover and extract multitude of unpleasant scenarios that hinder the smooth operations of train track units due to its high selectivity and sensitivity quality
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