Low Earth orbit (LEO) satellite is one of the most promising infrastructures for realizing next-generation global wireless networks with enhanced data rates. Applying massive multiple-input multiple-output (mMIMO) to LEO communication systems a novel idea enhance capacity and realize high-speed interconnection. However, obtaining effective instantaneous channel state information (iCSI) challenging due time-varying propagation environment long transmission delay. In this letter, deep learning...

Fatigue is an important factor affecting modern flight safety. It can easily lead to a decline in pilots’ operational ability, misjudgments, and illusions. Moreover, it even trigger serious accidents. In this paper, wearable wireless physiological device was used obtain electrocardiogram (ECG) data simulated experiment, 1440 effective samples were determined. The Friedman test adopted select the characteristic indexes that reflect fatigue state of pilot from time domain, frequency non-linear...

In this paper, to better evaluate the flight performance of pilot cadets, a evaluation index system was constructed based on task traffic pattern, training manual, and interviews with instructors. The fuzzy comprehensive model established by G1 method used cadets. data 30 cadets were collected verify applicability model. results showed that in paper can meet requirements evaluation. addition, consistent experts. Therefore, is effective feasible for cadets’ through method.

Fatigue can lead to sluggish responses, misjudgments, flight illusions and other problems for pilots, which could easily bring about serious accidents. In this paper, a wearable functional near-infrared spectroscopy (fNIRS) device was used record the changes of hemoglobin concentration pilots during missions. The data pre-processed, 1080 valid samples were determined. Then, mean value, variance, standard deviation, kurtosis, skewness, coefficient variation, peak range oxyhemoglobin (HbO2) in...

Cognitive load is generated by pilots in the process of information cognition about aircraft control, and it closely related to flight safety. physiological psychological need that a pilot produces when completing mission. Therefore, meaningful study dynamic identification cognitive under complex human-aircraft-environment interaction. In this paper, airfield traffic pattern simulation experiment was designed used obtain ECG NASA-TLX data. The wavelet transform preprocessing mathematical...

Diabetes mellitus is a chronic disease that affects over 500 million people worldwide, necessitating personalized health management programs for effective long-term control. Among the various biomarkers, glycated hemoglobin (HbA1c) crucial indicator monitoring blood glucose levels and assessing diabetes progression. This study introduces an innovative approach to by integrating mobile application machine learning. We designed implemented intelligent capable of collecting comprehensive data...

In this paper, a high gain and low grating lobe electrically large array antenna is proposed by using Fabry-Perot cavity (FPC). The feeding composed elements with property (ELP) based on TM30 mode. FPC between ground plane single-layer partially reflecting surface (PRS) made substrate arrays of square metal patches printed both the top bottom surfaces used here to narrow beamwidth element patterns, thus lobes caused spacing can be avoided. By analyzing parameters PRS unit cell, suitable cell...

In order to guarantee the emergency communication of anti-terrorism and safeguard stability, owing needs several works such as ensuring security for major events maintaining social it is great significance master situation target area through electromagnetic spectrum analysis problem that signal content difficult capture. From perspective analysis, this paper simulates monitoring data station, analyzes relationship by statistical signals, uses path loss model locate nodes. Experimental...

Purpose This study aimed to evaluate the image quality and degree of metal artifact reduction using new-generation gemstone spectral imaging (GSI) software (MARs) demonstrate optimal monochromatic energy level for dual-energy cerebral computed tomography angiography (CTA) in patients with intracranial aneurysm after endovascular treatment. Material Methods A total 20 aneurysms treated coils or clips underwent CTA tomography. Artifact index was calculated at each without MARs. Signal-to-noise...

The physiological, psychological, and physical characteristics of the pilot will have an impact on flight safety, mainly in pilot’s intention. In another word, this means psychological experience status under influence various factors preference for decision-making or behavioral value that is displayed. intention to reflect cognitive state showed during maneuvering aircraft. exploration very important study automatic control active safety system. Also, it concept often involved human flight,...

Nest-site selection plays a crucial role in reproductive success and survival of birds, particularly for territorial birds. Therefore, it is important to understand how birds identify select their nesting sites. The Amur Paradise Flycatcher (<em>Terpsiphone incei</em>) medium-sized species the Monarchidae family with dichromatism males. To investigate differences nest-site utilization strategies between different male morphs variables that influence nest species, we conducted study on during...

Flight simulation training is one of the most important methods in early-stage civil aviation flight training. In this regard, competitions are effective tools for evaluating skills trainees. study, a model developed trainees by integrating GBDT (Gradient Boosting Decision Tree), PSO (Particle Swarm Optimization), and CNNs (Convolutional Neural Networks). data from simulations employed Initially, performance scores gathered simulated competition platform. The algorithm then applied to filter...

Modern aircraft cockpit system is highly information-intensive. Pilots often need to receive a large amount of information and make correct judgments decisions in short time. However, cognitive load can affect their ability perceive, judge accurately. Furthermore, the excessive will induce incorrect operations even lead flight accidents. Accordingly, research on crucial reduce errors accidents caused by human factors. By using physiological acquisition systems such as eye movement, ECG,...

In this letter, a high-gain circularly polarized (CP) array antenna with low profile and grating lobe property is proposed. The composed of sidelobe CP patch elements based on odd high-order modes. By adding perturbation structure, pair orthogonal modes (TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">30</sub> /TM xmlns:xlink="http://www.w3.org/1999/xlink">03</sub> ) the 90° phase difference diagonally excited. Meanwhile, by introducing five...

Roundness error is a shape that affects the performance of mechanical parts, especially rotary motion performance. Its measurement generally needs to be carried out in normal section work-piece. Articulated coordinate measuring machine manual in-situ instruments widely applied production line, which cannot execute strictly cross-section. This paper reports an algorithm for evaluating roundness from measured data by articulated machine. Firstly cylindrical surface fit disperses on part under...

Time perception is a critical aspect in driving, and the head-on time-to-collision estimation one of drivers' time perceptions. Previous studies on perceptions have demonstrated that speed, distance, age, many other factors can affect accuracy estimation. But increasing number traffic incidents caused by female drivers rage make it necessary to determine whether gender emotion are also taken into account. Thus, an experiment under actual driving conditions was conducted urban road, using...

Intention is the main embodiment of human cerebral conscious activities, which has an important influence on guiding realization behaviour. It a vital prerequisite for analysing dynamic characteristics pilots with different intentions. Considering intention law generation, transfer and reduction, this paper analyses intentions, starting from factors effect intention. Taking airfield traffic pattern as example simulating flight experiments, pilot’s multi-source data – aircraft environment...

Dynamic and accurate identification of pilot intention is an important prerequisite for more control behavior, automatic flight early warning, human–aircraft shared autonomy. Meanwhile, it also the basic requirement microscopic research on safety. In response to these demands, airfield traffic pattern simulation experiment was carried out obtain pilot’s physiological data, such as electrocardiogram, respiration, skin electricity, under different intentions. The extended symbol aggregation...