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Related Concept Videos

Types Of Collisions - I01:04

Types Of Collisions - I

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When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a relatively short amount of time. A collision can be categorized as either an elastic or inelastic collision. If two or more objects approach each other, collide and then bounce off, moving away from each other with the same relative speed at which they approached each other, the total kinetic energy of the system is said to be conserved. This...
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Types of Collisions - II01:19

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When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
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Elastic Collisions: Introduction01:00

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An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
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Collisions in Multiple Dimensions: Problem Solving01:06

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In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should write down the momentum conservation in each direction separately. To help understand collisions in multiple dimensions, consider an example.
A small car of mass 1,200 kg traveling east at 60 km/h collides at an intersection with a truck of mass 3,000 kg traveling due north at 40 km/h. The two vehicles are locked together. What is the...
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Elastic Collisions: Case Study01:15

Elastic Collisions: Case Study

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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Collisions in Multiple Dimensions: Introduction01:05

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It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
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Data Communication Based on MQTT in a Polymer Extrusion Process
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Preamble Design and Collision Resolution in a Massive Access IoT System.

Ailing Zhong1,2,3, Zhidu Li1,2,3, Ruyan Wang1,2,3

  • 1School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.

Sensors (Basel, Switzerland)
|January 6, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new scheme to efficiently manage massive random access (RA) in Internet of Things (IoT) systems. The proposed method reduces preamble collisions and improves device identification for better network performance.

Keywords:
Internet of Thingspreamble collision resolutionrandom accesstiming advance capturing

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Area of Science:

  • Wireless Communication
  • Internet of Things (IoT)
  • Network Access Schemes

Background:

  • Massive access is a key challenge for future Internet of Things (IoT) systems.
  • Efficiently supporting a large number of devices accessing the network simultaneously is crucial.
  • Existing random access (RA) schemes face limitations in handling massive connectivity.

Purpose of the Study:

  • To propose an effective preamble collision resolution scheme for massive random access (RA) in IoT systems.
  • To enhance the efficiency and reliability of network access for a large number of IoT devices.
  • To address the challenge of supporting massive access in future IoT networks.

Main Methods:

  • A novel sub-preamble structure is designed to decrease preamble collision probability.
  • A multiple timing advance (TA) capturing scheme is developed to differentiate devices transmitting the same preamble.
  • An RA scheme is formulated to sustain massive access, with performance analyzed analytically.

Main Results:

  • The proposed sub-preamble structure effectively reduces preamble collision probability.
  • The multiple TA capturing scheme successfully identifies devices sending identical preambles.
  • Analytical studies and simulations validate the effectiveness of the RA scheme.

Conclusions:

  • The developed RA scheme sustains massive access in IoT systems by mitigating preamble collisions and improving device identification.
  • The proposed sub-preamble structure and TA capturing scheme offer significant improvements in network efficiency and reliability.
  • This research provides a viable solution for the challenge of massive connectivity in future IoT deployments.