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Related Concept Videos

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Deconvolution01:20

Deconvolution

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Related Experiment Video

Updated: Jul 10, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
08:48

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

Experimental demonstration of kinogram-based single-phase decryption technique for information security.

Tien Viet Vu1, Nam Kim, Jun-Won An

  • 1Department of Information and Communication Engineering, Chungbuk National University, Cheongju, South Korea.

Applied Optics
|November 2, 2007
PubMed
Summary
This summary is machine-generated.

A novel kinogram-based technique enables single-phase decryption using one spatial light modulator for both encryption and decryption keys. This method enhances information security and decryption quality by analyzing key types and system parameters.

Related Experiment Videos

Last Updated: Jul 10, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
08:48

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

Area of Science:

  • Optics and Photonics
  • Information Security
  • Digital Image Processing

Background:

  • Traditional optical encryption methods often require complex setups.
  • Single-phase spatial light modulators offer potential for simplified optical systems.
  • The security and robustness of optical decryption techniques are critical.

Purpose of the Study:

  • To experimentally demonstrate a kinogram-based single-phase decryption technique.
  • To investigate the impact of different key types (binary and multiphase) on security.
  • To analyze the influence of system parameters on decryption quality.

Main Methods:

  • Utilizing a single phase spatial light modulator for simultaneous display of encrypted data and decryption key.
  • Performing Fourier transformation on phase-decrypted information to obtain the intensity image.
  • Experimentally evaluating the effects of key displacement, optical system bandwidth, and noise.

Main Results:

  • Successful experimental demonstration of kinogram-based single-phase decryption.
  • Quantified the influence of binary versus multiphase keys on information security.
  • Determined the acceptable displacement tolerance for the decryption key.
  • Assessed the impact of optical bandwidth limitations and noise on the final decrypted image quality.

Conclusions:

  • The kinogram-based single-phase decryption technique is feasible and effective.
  • Key type significantly affects the security level of encrypted information.
  • System parameters like bandwidth and noise play a crucial role in decryption fidelity.