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Related Concept Videos

Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
Signal Sequences and Sorting Receptors01:41

Signal Sequences and Sorting Receptors

Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
Basic Discrete Time Signals01:16

Basic Discrete Time Signals

The unit step sequence is defined as 1 for zero and positive values of the integer n. This sequence can be graphically displayed using a set of eight sample points, showing a step function starting from n=0 and remaining constant thereafter.
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is the...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

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...
Next-generation Sequencing03:00

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.

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Related Experiment Video

Updated: Jul 7, 2026

Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps
11:52

Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps

Published on: February 9, 2017

Pattern sequence recognition using a time-varying Hopfield network.

Donq-Liang Lee1

  • 1Dept. of Electron. Eng., Ta-Hwa Inst. of Technol., Hsin-Chu.

IEEE Transactions on Neural Networks
|February 5, 2008
PubMed
Summary

A novel time-varying Hopfield model (TVHM) effectively recognizes temporal sequences. This neural network approach enhances pattern recall without synchronous dynamics or interpolated patterns, improving storage capacity.

Related Experiment Videos

Last Updated: Jul 7, 2026

Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps
11:52

Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps

Published on: February 9, 2017

Area of Science:

  • Artificial Intelligence
  • Computational Neuroscience
  • Machine Learning

Background:

  • Conventional neural networks face challenges in recalling complex temporal sequences.
  • Existing matrix encoding schemes limit the implementation of desired flow vector fields for pattern sequence recall.

Purpose of the Study:

  • To introduce a novel continuous-time Hopfield-type network for effective temporal sequence recognition.
  • To address the limitations of conventional methods in implementing flow vector fields for sequence recall.

Main Methods:

  • A time-varying Hopfield model (TVHM) is proposed, utilizing a weight matrix encoding auto-correlation and cross-correlation from distinct pattern sets.
  • The TVHM's weight matrix construction ensures consistent flow vector directions between adjacent stored patterns.
  • Flow vector field distribution around stored patterns is modulated by a time variable.

Main Results:

  • Theoretical analysis of the TVHM's radii of attraction and recalling dynamics is presented.
  • The proposed approach eliminates the need for synchronous dynamics or interpolated training patterns, differentiating it from existing methods.
  • A method for increasing the storage capacity of the TVHM is introduced.

Conclusions:

  • The time-varying Hopfield model demonstrates validity, capacity, and recall capability for temporal sequence recognition.
  • Experimental results confirm the effectiveness and potential applications of the proposed TVHM.
  • This novel network architecture offers an advancement in neural network-based temporal pattern processing.