Alongside the rapid development of artificial intelligence and mobile Internet, face recognition has gradually become a mainstream intelligent terminal authentication technology that is widely applied in security, fin...
详细信息
Adversarial attacks reveal the vulnerability of classifiers based on deep neural networks to well-designed perturbations. Most existing attack methods focus on adding perturbations directly to the pixel space. However...
详细信息
We propose that a tree-like hierarchical structure represents a simple and effective way to model the emergent behaviour of financial markets, especially markets where there exists a pronounced intersection between so...
详细信息
In cloud computing environments, trust evaluation models are critical for assessing the reliability and security of cloud service providers. The accuracy of trust evaluations may be impacted by the failure of traditio...
详细信息
Nowadays, social media has become the preferred communication platform for web users but brought security threats. Linguistic steganography hides secret data into text and sends it to the intended recipient to realize...
详细信息
Graded dielectric media composites, with negative-index materials (MM), are of interest for various applications such as microwave graded-index (GRIN) lenses [ 1,2], wideband THz filtering [3], and enhanced energy har...
详细信息
ISBN:
(纸本)9798350360974
Graded dielectric media composites, with negative-index materials (MM), are of interest for various applications such as microwave graded-index (GRIN) lenses [ 1,2], wideband THz filtering [3], and enhanced energy harvesting [4]. Graded dielectric media with regular positive-index materials are also of importance in e.g. the field of biosensing. One example is mimicking of dielectric phantoms for the characterization of biological tissue's properties and response to electromagnetic radiation [5,6]. Our research is therefore of interest for applications within both general electromagnetics and biosensing due to its generality. In line with our previous work [7], in the present abstract we review TE-wave propagation in waveguide structures filled with dielectric composites graded along the direction of the waveguide (conveniently chosen to be z-direction). Using Maxwell's equations in a source-free (p = 0 and 7 = 0) inhomogeneous medium{Formula Method} for TE-waves (Ez = 0) in the z-direction along the waveguide structure filled with a non-magnetic (ii(r, a») = ii0) dielectric composite with graded permittivity along the z-direction (e(r, a») = e(z, a»)), the wave equation for the electric field reduces to a simple form V2E(r, a>) + fc2£r(z, a>)E(r, a>) = 0 where k2 = o»2£0lu0 and £r(z,a>) is the relative permittivity function. The longintudinal component of the magnetic field Hz(r,a>) satisfies the same differential equation, i.e. V2Hz(r,a>) + k2Er(z,a>)Hz(r,a>) = 0 . These wave equations have the form of the Klein-Gordon (or Schrôdinger) equation of quantum physics, and they offer readily available exact analytical solutions for a number of permittivity profiles of interest, such as the hyperbolic tangent profile or periodic (sinusoidal) profile and similar. As an example, for a circular waveguide, of radius r0 , filled with graded dielectric composite with the periodic permittivity function{Formula Method} where C {...} and S {...} are the even and odd Mathieu func
DDoS attacks are becoming more prevalent, which poses serious problems for network performance and security. This investigation makes use of the OPNET Modeler to thoroughly analyze how DDoS attacks affect network perf...
详细信息
The integration of Artificial Intelligence (AI) into educational technologies marks a significant shift in learning methodologies and operational dynamics within educational institutions. At the forefront is an AI-dri...
详细信息
Heart disease is a clinical illness that is caused by structural and functional tissue dysfunction. According to the arena health company (WHO), heart disease is the leading cause of death worldwide, with a recent stu...
详细信息
This paper addresses the tracking control problem of a class of multiple-input–multiple-output nonlinear systems subject to actuator *** a balance between input saturation and performance constraints,rather than cond...
详细信息
This paper addresses the tracking control problem of a class of multiple-input–multiple-output nonlinear systems subject to actuator *** a balance between input saturation and performance constraints,rather than conducting isolated analyses,especially in the presence of frequently encountered unknown actuator faults,becomes an interesting yet challenging ***,to enhance the tracking performance,Tunnel Prescribed Performance(TPP)is proposed to provide narrow tunnel-shape constraints instead of the common over-relaxed trumpet-shape performance constraints.A pair of non-negative signals produced by an auxiliary system is then integrated into TPP,resulting in Saturation-tolerant Prescribed Performance(SPP)with flexible performance boundaries that account for input saturation ***,SPP can appropriately relax TPP when needed and decrease the conservatism of control *** the help of SPP,our developed Saturation-tolerant Prescribed Control(SPC)guarantees finite-time convergence while satisfying both input saturation and performance constraints,even under serious actuator *** are conducted to illustrate the effectiveness of the proposed SPC.
暂无评论