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Related Concept Videos

Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

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In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
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Basic Continuous Time Signals01:22

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Basic continuous-time signals include the unit step function, unit impulse function, and unit ramp function, collectively referred to as singularity functions. Singularity functions are characterized by discontinuities or discontinuous derivatives.
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Continuous -time Fourier Transform01:11

Continuous -time Fourier Transform

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The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
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Observational Learning01:12

Observational Learning

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Albert Bandura's observational learning, also known as imitation or modeling, occurs when a person observes and imitates another's behavior. It is a quicker process than operant conditioning. A well-known example is the Bobo doll study, where children who saw an adult acting aggressively towards the doll were more likely to act aggressively when left alone, compared to those who observed a nonaggressive adult. Many psychologists view observational learning as a form of latent learning...
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A time-series graph is a line graph with repeated measurements taken at successive intervals of time. It is also called a time series chart. To construct a time-series graph, one must look at both pieces of a paired data set. The horizontal axis is used to plot the time increments, and the vertical axis is used to plot the values of the variable that one is measuring. By using the axes in this way, each point on the graph will correspond to time and a measured quantity. The points on the graph...
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Continuous-time systems have continuous input and output signals, with time measured continuously. These systems are generally defined by differential or algebraic equations. For instance, in an RC circuit, the relationship between input and output voltage is expressed through a differential equation derived from Ohm's law and the capacitor relation,
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Summary
This summary is machine-generated.

Deep learning models can struggle with changing data, a problem called catastrophic forgetting. This review explores deep learning for sensor time series, using continual learning to maintain knowledge over time.

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Area of Science:

  • Artificial Intelligence
  • Machine Learning
  • Data Science

Background:

  • Deep Learning (DL) models excel at feature abstraction but struggle with non-stationary data distributions.
  • Catastrophic forgetting, the abrupt loss of learned knowledge, is a key challenge for DL in dynamic environments.
  • Sensor time series data often exhibits non-stationarity, necessitating robust learning approaches.

Purpose of the Study:

  • To systematically review Deep Learning applications in sensor time series analysis.
  • To highlight the necessity of advanced preprocessing techniques for sensor data.
  • To summarize methods for deploying DL in time series modeling while mitigating catastrophic forgetting using continual learning.

Main Methods:

  • Systematic literature review of Deep Learning applications in sensor time series.
  • Analysis of preprocessing techniques tailored for sensor data challenges.
  • Exploration of continual learning strategies to address catastrophic forgetting in time series models.

Main Results:

  • Identified diverse applications of DL in sensor time series across various domains.
  • Emphasized the importance of domain-specific preprocessing for optimal model performance.
  • Demonstrated the efficacy of continual learning methods in preserving knowledge during model updates.

Conclusions:

  • Deep Learning, combined with advanced preprocessing and continual learning, offers powerful solutions for sensor time series analysis.
  • Tailored DL approaches are crucial for handling the complexities of real-world sensor data.
  • Continual learning is essential for building adaptive and persistent DL models in dynamic environments.