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Related Concept Videos

Upsampling01:22

Upsampling

237
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
237
Sampling Theorem01:15

Sampling Theorem

340
In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
340
Sampling Methods: Overview01:06

Sampling Methods: Overview

319
A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of...
319
Aliasing01:18

Aliasing

136
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
136
Downsampling01:20

Downsampling

158
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
158
Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

222
Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
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A quantum-based oversampling method for classification of highly imbalanced and overlapped data.

Bei Yang1, Guilan Tian1, Joseph Luttrell2

  • 1School of Computer and Artificial Intelligence, National Supercomputing Center in Zhengzhou, Zhengzhou University, Zhengzhou 450001, China.

Experimental Biology and Medicine (Maywood, N.J.)
|January 28, 2024
PubMed
Summary
This summary is machine-generated.

A new quantum-based oversampling method (QOSM) effectively addresses data imbalance and class overlapping. This novel approach improves classification accuracy for imbalanced datasets, outperforming existing methods.

Keywords:
Classificationclass imbalanceclass overlappingoversamplingquantum potential energy

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Area of Science:

  • Machine Learning
  • Data Science
  • Quantum Computing Applications

Background:

  • Data imbalance and class overlapping significantly degrade classification performance.
  • Existing methods often fail to address both challenges simultaneously.

Purpose of the Study:

  • To introduce a novel quantum-based oversampling method (QOSM) for tackling data imbalance and class overlapping.
  • To enhance classification performance on challenging datasets.

Main Methods:

  • QOSM employs quantum potential theory to calculate sample potential energy.
  • A constructive covering algorithm selects optimal cover centers, focusing on overlapping regions.
  • Oversampling is applied to minority class covers to reduce imbalance ratio (IR).

Main Results:

  • QOSM significantly improves classification accuracy across SVM, KNN, and NB classifiers.
  • The method demonstrates superior performance compared to existing oversampling techniques.
  • Evaluated on 10 imbalanced KEEL datasets with varying overlap degrees.

Conclusions:

  • QOSM effectively mitigates data imbalance and class overlapping.
  • The method shows broad applicability and compatibility with various classifiers.
  • QOSM offers a promising solution for improving classification on highly imbalanced and overlapped data.