[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

비만아 부모의 돌봄 경험: q 방법론

Cosine-transform-based chaotic system for image encryption

A novel bit-level image encryption algorithm based on chaotic maps

2D Logistic-Sine-coupling map for image encryption

The second-order coherence of optical fields at output ports of a beam splitter is investigated. The properties of the second-order coherence are not only strongly dependent on the input states but also quite involved with the nature of the beam splitter. When parameters of both the input states and the beam splitter are chosen appropriately, the fields at the output ports will exhibit quantum behaviour. Between the two output modes, there stands mode–mode correlation which can even be anticorrelation. Some nonclassical properties, such as the photon antibunching effect of the input fields, may be destroyed by the beam splitter.

https://iopscience.iop.org/article/10.1088/0953-4075/38/23/011/pdf

Second-order coherence of light fields with a beam splitter

Quantum SUSAN edge detection based on double chains quantum genetic algorithm

Relay selection for physical layer security is investigated in Decode-and-forward (DF) two-way relay networks, consisting of a group of intermediate nodes, two sources, and one eavesdropper. Three intermediate nodes are selected in the two transmission phases. One intermediate node is selected to perform the relaying operation, and the other two are selected to transmit the jamming to deteriorate the eavesdropping channels. It is found that the cooperative jamming scheme outperforms the conventional non-jamming scheme in the common scenario, where the intermediate nodes are distributed dispersedly. However, when the intermediate nodes cluster gets close to the sources, it is not superior any more due to the strong interference on the destinations. Therefore, an instantaneous switching between the nonjamming scheme and the jamming scheme is proposed to avoid the negative interference. The hybrid scheme is validated to well improve the secrecy performance of DF two-way relay networks via simulation analyses.

http://www.joics.com/publishedpapers/2013_10_18_5821_5828.pdf

Relay Selection for Physical Layer Security in Decode-and-forward Two-way Relay Networks

Based on the Einstein–Podolsky–Rosen (EPR) entangled state representation, we show that the complex Wigner transform for the complex function ψ(η) turns out to be the quantum statistical average of the entangled Wigner operator in the state |ψ. The complex fractional Fourier transform is also introduced, which corresponds to a rotation of the complex Wigner function. Thus, the intrinsic relation between the complex Wigner transform and the EPR entangled state is revealed.

The complex fractional Fourier transform, the complex Wigner transform and the entangled Wigner operator in EPR entangled state representation

A new colour image encryption scheme that combines real-valued discrete Gabor transform (RDGT), 3D chaotic system with bit scrambling is proposed. First, the plaintext image is performed by the real-valued discrete Gabor transform. Subsequently, the transformed image undergoes Arnold transform to disorder bit values, and the coefficients of Arnold transform are selected from the chaotic sequence. Finally, the processed image matrix is XORed and scrambled with the 3D chaotic sequence after cyclic shift operation. The proposed algorithm possesses a large key space, and the keys are related to the plaintext image. Since the correlation of the ciphertext image is significantly smaller than that of the original image, the performance of the proposed algorithm is acceptable. Simulation results and performance analyses illustrate that the proposed colour image encryption scheme is feasible and secure.

Nanrun Zhou

Papers

Second-order coherence of light fields with a beam splitter

Quantum SUSAN edge detection based on double chains quantum genetic algorithm

Relay Selection for Physical Layer Security in Decode-and-forward Two-way Relay Networks

The complex fractional Fourier transform, the complex Wigner transform and the entangled Wigner operator in EPR entangled state representation

Colour image encryption scheme based on the real-valued discrete Gabor transform