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Reliable and scalable storage systems are key to cloud-based applications. In cloud storage, users store their data on remote servers rather than their local computers. Secure storage is used to ensure the safety of data in clouds. As more and more users rely on third-party cloud vendors to store their data, concerns have arisen among users and cloud providers. Encryption-based approaches are commonly...
Chaos generated by a semiconductor laser subject to self-phase-modulated optical feedback is proposed, where the time-delay-signature is concealed and complexity is enhanced. Fascinatingly, the probability density distribution of its output intensity is close to symmetry.
With the high power density and the simple structure, complementary and modular linear flux-switching permanent magnet (CMLFSPM) motor is especially suitable for urban rail transit application. A high dynamic performance of the system is significant in transportation system. Compared to the flux-oriented control, the Direct Thrust Control (DTC) method has fast torque response and is scarcely influenced...
This paper proposes a two-dimension encryption orthogonal frequency division multiplexing passive optical network (OFDM-PON) based on dynamic chaos-iteration. The correlation monitoring method is adopted to achieve dynamic key distribution between OLT and ONUs. It is shown that key space can be larger than 1086, which would be against exhaustive attack effectively. We experimentally demonstrate a...
We propose a scheme for fast random number generation with a bandwidth-enhanced chaotic signal generated by injecting the signal of a traditional chaotic external-cavity semiconductor laser (ECSL) into a spectrum expansion module (SE). Our simulation results show that the bandwidth-enhanced chaotic can be generated and its efficient bandwidth can be greatly enhanced up to 70 GHz. Random bits in our...
A security-enhanced chaos communication scheme by expanding and compressing the spectrum of modulated chaotic carrier is proposed, in virtue of a spectrum expansion module composed of two phase modulators and two dispersion mediums. The numerical results demonstrate that the efficient bandwidth of modulated chaotic carrier can be expanded up to several tens of GHz and the RF spectrum is uniformly...
Chaos synchronization in closed-loop external cavity semiconductor lasers subject to phase-conjugate feedback is investigated theoretically and numerically. We theoretically analysed the injection-locking synchronization condition and numerically confirm it. The simulation results indicate that with introduction of feedback phase difference according to the theoretical synchronization condition, high...
We have numerically demonstrated a high-speed bidirectional chaotic communication, where chaotic optical signal with suppressed time delay signature is used. In this scheme, the output of a third semiconductor laser is used as the common signal driving the other two identical lasers with self-feedback to be synchronized. To enhance the bandwidth of the chaotic signal employing in the communication,...
Most existent studies of nanosilver paste, a promising package material, focused on a relatively small sintering area (< 100 m2). In this study, we were trying to bond 40 mm × 40 mm copper baseplate with 25 mm × 25 mm DBC using nanosilver paste in low temperature and pressure. Shear strength distribution and morphology was reported in this work. Through this process, the average shear strength...
The integrated manufacturing or production system is a cyber-physical system. According to the basic principle of defense in depth, the corresponding protection is carried out at different security zones. AS the key technologies of perimeter defense, industrial firewall is used between enterprise zone and manufacturing zone. By utilizing an industrial demilitarized zone in firewall, resources are...
In this study, cortical oscillatory dynamics with respect to tactile selective sensation tasks were investigated. Subjects were required to perform three tactile attention tasks, prompted by cues presented in random order and while both wrists were simultaneously stimulated: 1) selective sensation of the left hand (SS-L), 2) selective sensation of the right hand (SS-R), 3) bilateral selective sensation...
Although BCI technology has vastly improved in the last few years, very little research has been done into how different types of cues may affect the resulting signal. We have conducted preliminary work to examine the effects of using auditory versus visual cues on MRCP signal detection. While our sample size was small (n=5), the data for auditory and visual cues were not statistically different for...
Cyberlearning is challenged by the lack of personal and assessment-driven learning, and students are often puzzled by the lack of instructor guidance and feedback; the huge volume and diversity of the learning materials; and the lack of the ability to zoom in from the general concepts to the more specific ones, or the opposite. Knowledge-driven tutoring systems are needed to improve the cyberlearning...
By introducing sinusoidal phase-modulated feedback to semiconductor lasers of closed-loop chaos-based communication system, the efficient bandwidth of chaotic carrier can be broadened greatly, the BER performance can be improved, and the communication security is enhanced.
We propose and demonstrate a Hilbert Superposition (HS) scheme in an optical single side-band (SSB) modulation and direct-detection system. The optical SSB signal is generated by a relatively low-cost dual-drive Mach-Zehnder modulator (DDMZM) biased at the quadrature point. The two driving signals are a pair of Hilbert signals with Nyquist pulse-shaped four-level pulse amplitude modulation (NPAM-4)...
This work proposes a Common Spatial Pattern with Polarity Check (CSPPC) to facilitate Movement Related Cortical Potential (MRCP) detection. The algorithm was compared with the Locality Preserving Projection (LPP) algorithm in the context of detecting foot dorsiflexion within a group of thirteen subjects. It has been shown that CSPPC achieved a significantly reduced delay latency compared to LPP (−25...
We experimentally demonstrate all-optical wavelength conversion of OFDM signals by using two-mode injection-locking in a Fabry-Pérot laser. We show the tradeoff between the capacity and performance, and measure the power penalty after wavelength conversion.
An energy-efficient and robust optical access network structure is proposed and investigated. By adopting the ring structure with network interconnection, substantial energy saving is achieved and all access links are simultaneously protected.
Boosting is an established propositional learning method to promote the predictive accuracy of weak learning algorithms, and has achieved much empirical success. However, there have been relatively few efforts to apply boosting to Inductive Logic Programming (ILP) approaches. We investigate the use of boosting descriptive ILP systems, by proposing a novel algorithm for generating classification rules...
In recent years, the use of nonlinear ultrasound in medical and industrial applications has increased rapidly. Harmonic signals, generated from nonlinear distortion of ultrasonic wave propagation in fluid or solid media, play an important role not only in ultrasonic medical imaging to provide higher resolution and higher contrast to tissue ratio, but also in nondestructive testing of fatigue cracks...
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