Browse Articles

Energy efficiency maximization for IRS-assisted UAV short packet communication

Abstract With the development of the sixth generation wireless communication networks, low latency is required to support its applications. In order to meet the low latency requirement, short packet communication is considered to be used, in which a ground sensor transmits the sensing information to a fixed-wing unmanned aerial vehicle (UAV). In this paper, we consider maximizing the energy efficiency of intelligent reflecting surface (IRS)-assisted UAV short packet communication by optimizing the UAV’s speed, trajectory, transmit power and passive beamforming of IRS. Since the maximization problem is nonconvex with respect to the system parameters, this problem is difficult to be solved. Therefore, the successive convex approximation method is employed and a joint iterative optimization algorithm is proposed to solve this problem. In the simulation parts, it is shown that the algorithm proposed in this paper has good convergence performance. And there exists an optimal value of flight speed for the UAV to minimize the energy consumption. In addition, it is found that the application of IRS can improve the energy efficiency effectively.

Surface modification and performance of wool fibers after combined plasma and enzyme treatments

Global burden of malaria before and after the COVID-19 pandemic based on the global burden of disease study 2021

The gender-sex incongruence is partly a mind–body incongruence

Clinical predictors for perioperative anticipated and unanticipated difficult intubation: a matched case-control study

Dual-fiber optical tweezers integrating high-sensitivity structured-light displacement measurement system on fiber end-face

Abstract The dual-fiber optical tweezers have become widespread in trapping, assembling, and sensing due to their simple fabrication process and flexible operation. However, the miniaturization and integration of their displacement measurement optical paths remain challenging. Here, we propose and experimentally demonstrate an integration of structured-light displacement (SLD) measurement method tailored for dual-fiber optical tweezers. A key component split-waveplate is integrated onto the fiber end via coating and etching in the SLD method. The etched fiber and another single mode fiber form optical tweezers, which enables to trap particle and measure its position simultaneously without additional optics. More importantly, it demonstrates a superior signal-to-noise ratio after filtering out the trapping field by the etched fiber. Our results demonstrate a displacement sensitivity reaching the 0.1 pm/Hz 1/2 level, which surpasses the performance of most results using the quadrant photodiode method. Ultimately, we discussed the possibilities of using two etched fibers to detect displacements in different directions, or integrating this method into a single optical fiber. This method has significant potential applications in precision sensing, contributes to the integration of optical tweezers and fosters the development of lab-on-fiber applications.

Multicast reliable traffic engineering technique for SDN-Fog based IoUT

Abstract Underwater Internet of Things (IoUT) networks have gained considerable attention in recent years due to their wide-ranging applications in exploring and monitoring underwater environments, such as oceans and seas. Compared to previous decades, these networks have significantly improved our ability to understand and interact with aquatic ecosystems. However, several challenges remain, including the dynamic and variable conditions of underwater environments, high propagation delays, and the inherent unreliability of underwater communication channels. Ensuring reliable communication between underwater devices and surface nodes continues to be a critical concern. In this paper, we propose a novel solution that integrates Software-Defined Networking (SDN) architecture with Fog Computing to enhance communication reliability in underwater environments. The proposed method is based on an Integer Linear Programming (ILP) model designed to optimize underwater communication. Specifically, the approach considers communication between traffic-generating underwater nodes and surface-level nodes as a multicast operation. By solving this model, an optimized routing tree is generated that minimizes delays while maximizing reliability. The resulting routing structure is then disseminated to the underwater nodes by the network controller. Simulation results confirm that the adoption of an SDN-Fog-based architecture, combined with multicast routing, significantly enhances underwater communication performance, particularly in terms of reliability and network lifetime.

Enhanced multi agent coordination algorithm for drone swarm patrolling in durian orchards

Effects of transcranial direct current stimulation on pre-competitive cognitive performance and anxiety in collegiate athletes: a randomized controlled trial

Leucine-rich Alpha-2 glycoprotein could be clinically useful in active and postoperative Crohn’s disease

Lightweight obstacle detection for unmanned mining trucks in open-pit mines

Global temporal trends in maternal hypertensive disorders incidence and mortality from 1990 to 2021 based on the global burden of disease study

Temperature-dependent electronic structure of a quasi-two-dimensional conductor η-Mo4O11

Negative association of composite dietary antioxidant index with risk of hepatic fibrosis in individuals underwent cholecystectomy: a cross-sectional study

The effect of abamectin exposure on gametogenesis in zebrafish

Mitigating opinion polarization in social networks using adversarial attacks

Validation of reliable reference genes for comparison of gene expression across species in the Anopheles Hyrcanus Group

The development and validation of a performance infill tracking system to investigate rotational traction mechanisms on artificial turf surfaces

Abstract The scientific principles governing the generation of rotational traction forces on artificial turf remain poorly understood; as such, a photogrammetry technique has been developed to understand the interactions occurring at the boot-surface interface. Videos were recorded through a transparent test foot during rotational traction testing on an artificial turf surface “seeded” with distinguishable performance infill particles. A novel particle tracking software then measured the movement of seeded particles. To determine the uncertainty in the methodology, a gold-standard measurement system determined the distances between 28 fiducial markers. The same marker-to-marker distances were measured using the particle tracking software. For ten static and ten rotating trials, the random bias in the particle tracking software distances was ± 0.89 mm to ± 1.07 mm, respectively. A pilot study on a third-generation artificial turf surface assessed the software’s ability to track infill particles during rotational traction testing. Trials were conducted at two normal loads; particle positions and angular displacements were successfully measured over 40° of rotation and synchronised with torque, angle, and vertical displacement data. A greater number of infill particles were lost during tracking at lower normal loads. This novel methodology represents a useful development in understanding the generation of traction forces, helping to inform future generations of artificial turf and studded footwear.

Impact of regional driving behavior differences on traffic flow

Plakoglobin does not participate in endothelial barrier stabilization mediated by cAMP

Abstract Critical for maintenance of endothelial barrier is the remodeling of the actin cytoskeleton and the precise control of junctional integrity. Plakoglobin (PG) is a structural and signaling protein involved in vascular permeability regulation together with key signaling molecules such as cAMP, Rho GTPases and actin-binding proteins. Here, we investigated the role of PG in cAMP-mediated endothelial barrier stabilization by establishing myocardial endothelial cells derived from wild type (WT) and PG knock-out (PG-KO) mice. Under basal conditions, TEER measurements showed increased barrier function of PG-KO, an effect associated with enhanced protein levels and junctional VE-cadherin and β-catenin accumulation. PG-KO cells also displayed more PECAM-1 and VE-PTP-phosphatase and less phosphorylated VE-cadherin, typically linked with modulation of junctional integrity. PG ablation neither changed the composition of VE-cadherin/β-catenin complex nor activities of Rac1 and RhoA but decreased the basal intracellular cAMP concentration. Remarkably, cAMP augmentation led to enhanced Rac1 activity and TEER in both cell lines, but the effect was less prominent in PG-KO. The tighter barrier in WT was paralleled with more VE-cadherin, β-catenin and cortactin, an actin-binding protein, towards junctions. Surprisingly, PG phosphorylation at Ser665 was not required for cAMP-mediated endothelial barrier integrity, which is different to cardiomyocyte and keratinocyte cell adhesion.