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1

Primary parametric resonance of an axially accelerating beam subjected to static loads

Hu Y., Rong Y., Li J.

Journal of Theoretical and Applied Mechanics

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2018

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Vol. 56 nr 3

815--828

EN

Primary parametric resonance and stability of an axially accelerating and current-carrying beam subjected to static loads in magnetic ﬁeld are investigated. The nonlinear magneto-elastic vibration equation is derived. The approximate solution of the static problem and the disturbance deferential equation of the beam with two sides simply supported are obtained. The frequency-response equation of primary parametric resonance is further achieved by a multi-scale method. According to stability conditions, the stability of the steady-state solution is also discussed. By numerical examples, the amplitude versus diﬀerent parameter curves and the bifurcation diagrams of the amplitude are acquired. The eﬀects of magnetic induction intensity, axial speed, detuning parameter and static loads on nonlinear vibration characteristics are also analyzed.

2

Differential Fault Attacks on Lightweight Cipher LBlock

Wei Y., Rong Y., Fan C.

Fundamenta Informaticae

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2018

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Vol. 157, nr 1/2

125--139

EN

Lightweight block cipher is usually used in “Internet of Thing” to protect confidentiality as well as to authentication. LBlock is a lightweight block cipher designed for tiny computing devices, such as RFID tags and sensor network nodes. The cipher algorithm iterates a Feistel structure with SP type round function by 32 rounds. Its block size is 64 bits and key size is 80 bits. The designers show that LBlock is resistant against most classical attacks, such as differential and linear cryptanalysis. This paper proposed differential fault analysis on LBlock based on different depth of fault model, the theoretical analysis demonstrates that LBlock is vulnerable to deep differential fault attack due to its Feistel structure and diffusion layer. By injecting faults in the 27th round to the 29th round, a differential fault analysis on LBlock based on a nibble-oriented random fault model is presented. The experiment shows that 4.3 faults on average could recover a round key. For reveal the whole key information, 13.3 faults on average are needed. This indicates that cryptographic devices supporting LBlock should be carefully protected.

3

The progressive evolution from giant magnetoresistance to anisotropic magnetoresistance in CoNi-Al2O3 granular films

Wang Ch., Rong Y., Hsu T.Y., Hsu T.Y.

Materials Science Poland

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2006

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Vol. 24, No. 2/1

351--356

EN

A series of CoNi-Al2O3 granular films were prepared with a magnetron controlled sputtering system. The magnetic-transport properties were measured by conventional four probes method. The results indicate that longitudinal GMR effect reaches a maximum of -2.1% at about 35 vol.% CoNi. Meanwhile, GMR effect is dominant when the volume fraction is less than about 50 vol.%, whereas AMR predominate in films when the volume fraction is larger than about 50 vol.%. It suggests that there exists a progressive evolution from GMR to AMR through percolation region in CoNi-Al2O3 granular films.