Physical layer security and full duplex have been two widely applied techniques in wireless communications community, where the physical can prevent eavesdropping without upper data encryption, while improve spectrum efficiency through simultaneous transmission reception. In this paper, we jointly consider by investigating cross-layer optimization problem to maximize secrecy rate multi-hop network. This combination aims both of conventional systems at same time. We first construct a model...

Stick–slip vibrations are widespread and hazardous phenomena in drilling practice. The objective of this paper is to develop a simple general control strategy minimise such together with unknown disturbances. Taking into account the transmission delay torsional energy from surface downhole, neutral-type drill-string model established applied rather than lumped-parameter that cannot provide satisfactory modelling precision. Based on model, major contribution consists combination disturbance...

Due to the nonlinear and nonminimum phase characteristics of buck-boost converter, design its controller has always been a challenging problem. In this paper, multi-index feedback linearization control strategy is proposed converter. Firstly, by constructing an appropriate output function, original system mapped into combination linear subsystem subsystem. Then, according structural these two subsystems, optimal theory adopted for make it have good performance, while subsystem, coefficient...

The Keulegan-Carpenter (KC) number is the main dimensionless parameter that affects local scour of offshore wind power monopile foundations. This study conducted large-scale (1:13) physical model tests to shape, equilibrium depth, and volume monopiles under action irregular waves with different KC numbers. Systematic experiments were carried out ranging from 1.0 13.0. With a small (KC < 6), especially when was less than 4, mainly occurred on both cross-flow sides low depth. When exceeded...

This paper gives a brief overview of the new features introduced in latest version tool Flow*. We mainly describe efficient scheme for integrating linear ODEs. show that it can efficiently handle challenging benchmarks on which, to best our knowledge, only SpaceEx works. Moreover, is also possible extend method deal with unbounded initial sets. A comparison between Flow* 1.2 and those given. Besides, we investigate scalability based non-linear line circuit benchmarks.

A controller is proposed based on the equivalent input disturbance (EID) method to suppress stick-slip vibration of drilling process. The drillstring system described by a neutral type model with unknown disturbances, where disturbances are mainly nonlinear bit-rock reaction. core idea this approach use EID variety external and impact caused state delay model. main advantage our that does not depend specific model, which great significance for suppression control in complex stratigraphic...

Lumped dispersion compensation is numerically investigated for 40-Gb/s return-to-zero differential phase-shift-keying transmission. Using pseudorandom binary sequence lengths up to 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sup> -1, simulation results indicate that better long-distance transmission performance can be achieved using lumped than conventional periodic inline compensation. Improved found a result of reduced nonlinear...

As a rule,the natural slope is not homogeneous,and its sliding surface arbitrary. However,the common stability analysis methods used to assume shape of and homogeneity,and the calculation process so complex that accuracy results decreasing.In this study,the potential energy function body established for with arbitrary on multi strata.Using minimum principle, displacement can be got. Then based Moore - Coulomb criterion condition force equilibrium in direction, safety factor got directly....

<title>Abstract</title> The offshore wind power is of great significance in the energy strategy. experimental results simulated by traditional small-scale physical model may become unreliable when extrapolated to strong field scales. This work conducts large scale (1:13) experiments study scour hole pattern and equilibrium depth around both slender monopiles under irregular waves. Keulegan-Carpenter (<italic>KC</italic>) number ranges from 1.01 8.89, diffraction parameter...

Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text D. Wang, L. Huo, Q. X. Chen, and C. Lou, "Time-to-frequency Conversion Based Nonlinear Pulse Shaping," in CLEO: 2014, OSA Technical Digest (online) (Optica Publishing Group, 2014), paper JW2A.28. Export BibTex Endnote (RIS) HTML Plain alert Save article

We review new options for long wavelength multimode fibers high speed transmission at 25Gbps and present recent results different transceivers using these or operating modal dispersion compensating fibers.

This paper proposes a dynamic-neural-network based kinematic controller for multi-robot collaborative handling systems. Due to the closed chain structure of multi robot systems and physical constraints system, modeling design become very challenging. In this regard, on relative position end effector common payload, model between load joint motion each is derived. Furthermore, combined with inequality system's constraints, dynamic programming type problem constructed that takes into account...

In this paper, a small current ground fault line selection system model is established under Matlab/Simulink environment. By setting the parameters and simulation parameters, of neutral point through arc suppression coil grounding mode completed. The characteristics single-phase are analyzed, zero-sequence voltage waveform diagrams non-fault given. principle by admittance method built, simulated, correctness verified.

We demonstrate transmissions of 25Gb/s signals from 1310nm silicon photonics transceiver over OM4 MMF through modal dispersion compensation. With the compensation fiber, ~1dB link power penalty was achieved 70 and 100m fiber links.

A self-starting optoelectronic oscillator that employs a diverging time lens and Mach–Zehnder modulator (MZM) in fiber-extended cavity to generate multiwavelength ultrashort pulse train is demonstrated. The switching window formed by the MZM narrowed use of lens, which phase our study. wavelength assignment scheme deployed simultaneously suppress pedestals pulses on different wavelengths. detailed analysis given, results are presented experiment. We have generated 25 GHz optical four...

A low insertion loss modal dispersion compensation module for SWDM applications including a two-band MUX/DEMUX and compensating fiber was fabricated. Extended transmission distance over OM4 MMF in 100G experiment demonstrated.