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Multi-input and Multi-variable systems01:22

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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
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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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The interval estimate of any variable is known as the prediction interval. It helps decide if a point estimate is dependable.
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Linearity is a system property characterized by a direct input-output relationship, combining homogeneity and additivity.
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Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
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In signal processing, signals are classified based on various characteristics: continuous-time versus discrete-time, periodic versus aperiodic, analog versus digital, and causal versus noncausal. Each category highlights distinct properties crucial for understanding and manipulating signals.
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Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption
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Intelligent multivariable air-quality forecasting system based on feature selection and modified evolving interval

Jianzhou Wang1, Hongmin Li1, Hufang Yang1

  • 1School of Statistics, Dongbei University of Finance and Economics, Dalian, China.

Environmental Pollution (Barking, Essex : 1987)
|February 5, 2021
PubMed
Summary

This study introduces an advanced air quality index (AQI) forecasting system using a novel neural network and feature selection. The intelligent hybrid model accurately predicts AQI by addressing uncertainties and climate factors.

Keywords:
Air quality forecastingFeature selectionFuzzy neural networkInterval type-2 fuzzy setsMulti-objective optimization algorithm

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Area of Science:

  • Environmental Science
  • Artificial Intelligence
  • Data Science

Background:

  • Air quality index (AQI) forecasting faces challenges due to high nonlinearity and noise.
  • Existing methods struggle to effectively address uncertainties and fuzziness in AQI prediction.
  • Accurate AQI forecasting is crucial for environmental management and public health.

Purpose of the Study:

  • To develop an intelligent hybrid air quality forecasting system.
  • To improve AQI prediction accuracy by incorporating climate influencing factors.
  • To effectively manage uncertainties and fuzziness in the forecasting process.

Main Methods:

  • A second-stage feature selection model was proposed to identify optimal input variables and reduce redundancy.
  • A modified evolving interval type-2 quantum fuzzy neural network (eIT2QFNN) was developed.
  • A novel multi-objective chaotic Bonobo optimizer algorithm was introduced to enhance the eIT2QFNN.

Main Results:

  • The proposed feature selection model effectively extracts influencing variables and removes redundant information.
  • The modified eIT2QFNN, enhanced by the novel optimizer, demonstrated improved AQI prediction capabilities.
  • Diebold-Mariano and modified Diebold-Mariano tests confirmed significant improvements in modeling performance.

Conclusions:

  • The developed intelligent hybrid system offers high accuracy and a compact structure for AQI forecasting.
  • The system effectively handles uncertainties and fuzziness inherent in air quality data.
  • This approach provides an effective tool for robust air quality management.