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Communication01:03

Communication

8.8K
Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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Communication01:28

Communication

11.6K
Sharing information, concepts, and emotions to foster mutual understanding is communication. The sender, recipient, and transaction must be considered in this manner. The sender is the person who shares the message, the recipient is the person who receives and understands the message, and the transaction is the method used to deliver the message and the variables that affect the communication's context and surroundings. The nurse-client connection is built on therapeutic communication.
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
59.7K
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

17.8K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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Transmission-based Precautions II: Airborne and Protective Environment01:25

Transmission-based Precautions II: Airborne and Protective Environment

2.0K
Transmission-based precautions are for patients infected or suspected to be infected (or colonized) with organisms posing a significant risk to others. The transmission precautions include airborne and protective environment precautions.
Airborne precautions:
Use airborne precautions when treating patients known or suspected to have diseases that spread through the air—for example, tuberculosis or measles. These organisms are present in smaller droplets expelled by an infected person and...
2.0K
Neuronal Communication01:28

Neuronal Communication

3.5K
Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
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Related Experiment Video

Updated: Feb 13, 2026

Data Communication Based on MQTT in a Polymer Extrusion Process
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Data Communication Based on MQTT in a Polymer Extrusion Process

Published on: July 15, 2022

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Access Control Mechanism for IoT Environments Based on Modelling Communication Procedures as Resources.

Luis Cruz-Piris1, Diego Rivera2, Ivan Marsa-Maestre3

  • 1Departamento de Automática, Escuela Politécnica Superior, Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain. luis.cruz@uah.es.

Sensors (Basel, Switzerland)
|March 21, 2018
PubMed
Summary

This study introduces a unified access control system for Internet of Things (IoT) devices and web services. It models IoT communication as resources, enabling secure data access across heterogeneous environments.

Keywords:
Internet of ThingsMQTTOAuthaccess controlsecurity

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Area of Science:

  • Computer Science
  • Cybersecurity
  • Network Engineering

Background:

  • The proliferation of Internet of Things (IoT) devices presents significant challenges in securing data access.
  • Existing access control schemes often struggle to provide unified security across heterogeneous IoT and web-based services.

Purpose of the Study:

  • To propose and validate a novel access control framework that integrates IoT devices with web-based services.
  • To establish a unified access control scheme for managing data across diverse IoT and internet-based systems.

Main Methods:

  • Developed a methodology to model IoT communication elements as securable resources.
  • Analyzed relevant IoT communication protocols, selecting Message Queuing Telemetry Transport (MQTT).
  • Integrated the proposed resource modeling with the User-Managed Access (UMA) authorization framework, an OAuth 2.0 profile.

Main Results:

  • Successfully demonstrated a unified access control system for heterogeneous IoT and web services.
  • Validated the correctness and effectiveness of the proposed access control mechanisms.
  • Evaluated the energy consumption overhead associated with the implemented solution.

Conclusions:

  • The proposed method effectively integrates IoT devices into a unified access control system for web services.
  • This approach enhances security and simplifies data access management in complex IoT environments.
  • The solution offers a viable path towards secure and manageable IoT ecosystems with minimal energy impact.