Statistical features extraction of discrete curvelet transform for surface quality evaluation of mangosteen

Author(s):  
Cahya Damarjati ◽  
Slamet Riyadi ◽  
Wahyu Indah Triyani ◽  
Laila M. Azizah ◽  
Tony K. Hariadi
Author(s):  
Xin Weng ◽  
Xiaoning Jin ◽  
Jun Ni

It is widely observed that today’s engineering products demand increasingly strict tolerances. The shape of a machined surface plays a critical role to the desired functionality of a product. Even a small error can be the difference between a successful product launch and a major delay. Thus, it is important to develop measurement tools to ensure the quality and accuracy of products’ machined surfaces. The key to assessing the quality is robust measurement and inspection techniques combined with advanced analysis. However, conventional Geometrical Dimensioning and Tolerancing (GD&T) such as flatness falls short of characterizing the surface shape. With the advancements in metrology methodology utilizing digital holographic interferometry, large amount of surface data can be captured at high resolution and accuracy without changing platform or technique. This captured High Definition Data (HDD) enables the mining of more valuable information from machined surfaces that most current industry practice cannot achieve in a timely manner. Such new metrology system opens the torrent of observable events at plant floor and increases the transparency of machining processes. This presents great opportunities to characterize machined surface into a new level of details, which can be applied in production quality evaluation and process condition monitoring and control. This research work proposes a framework of a multi-scale surface characterization for surface quality evaluation and process monitoring. Case studies are presented to show how proposed metrics could be applied in surface quality evaluation and process monitoring.


Optik ◽  
2020 ◽  
Vol 223 ◽  
pp. 165620
Author(s):  
Haoyu Dong ◽  
Yu Huang ◽  
Youmin Rong ◽  
Chunmeng Chen ◽  
Wenyuan Li ◽  
...  

Author(s):  
Khudhur A. Alfarhan ◽  
Mohd Yusoff Mashor ◽  
Abdul Rahman Mohd Saad ◽  
Mohammad Iqbal Omar

Heart monitoring kits are only available for bedridden patients and the traditional heart monitoring kits have many wires that are obstacle patients’ mobility. Most of the existing heart monitoring kits can not detect heart diseases. Thus, the current study proposed a wireless heart monitoring kit to monitor patients with a heart abnormality. The proposed kit can detect and classify four arrhythmia types as well as normal ECG with high accuracy. The design and development of the wireless heart abnormality monitoring kit (WHAMK) in this research were divided into three stages. These stages are the development of an arrhythmias detection and classification method using artificial intelligence approach, design and implementation of the kit hardware, and design and coding of the kit software. Arrhythmias classification approach is divided into four stages, namely obtaining the electrocardiograph (ECG) signals, preprocessing, features extraction and classification. The features extraction method are based on statistical features. The library support vector machine (LIBSVM) was used to classify the ECG signals. The hardware of the kit is divided into two parts, namely ECG body sensor (EBS), and processing and displaying unit (PDU). EBS working on acquiring the ECG signal from patient's body. PDU working on processing the collected ECG signal, plotting it and detecting the arrhythmias. Arrhythmias classification approach was developed by using statistical features and LIBSVM. They were implemented in the software of the kit to enable it to detect the arrhythmias in the real-time and fully automatically. The kit can detect and classify four arrhythmia types as well as normal sinus rhythm (NSR). These types of arrhythmia are premature atrial contraction (PAC), premature ventricles contraction (PVC), Bradycardia and Tachycardia. The proposed kit gave a good accuracy for detecting and classifying Arrhythmia with the overall accuracy of 96.2%.


2020 ◽  
Vol 59 (10) ◽  
Author(s):  
Abir Zanzouri Kechiche ◽  
Olivier Aubreton ◽  
Alexandre Mathieu ◽  
Antoine Mannucci ◽  
Christophe Stolz

2017 ◽  
Vol 265 ◽  
pp. 259-265 ◽  
Author(s):  
E.G. Kasatkina ◽  
I.Y. Mezin ◽  
A.S. Limarev ◽  
J.V. Somova

The study presents a comparative analysis of consumer properties of platinit by different producers. Both the products of Russian companies and the foreign counterparts are considered. It was established that the domestic platinit, though not very different in composition from its foreign analogues, is still inferior to them in its parameters, such as physical and technological properties, as well as surface quality.


2018 ◽  
Vol 99 (5-8) ◽  
pp. 1839-1852 ◽  
Author(s):  
Rosemar Batista Da Silva ◽  
Mariana Landim Silveira Lima ◽  
Mayara Fernanda Pereira ◽  
Bruno Souza Abrão ◽  
Leonardo Rosa Ribeiro Da Silva ◽  
...  

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