Twitter sentiment detectors (TSDs) provide a better solution to evaluate the quality of service and product than other traditional technologies. The classification accuracy detection performance TSDs, which are extremely reliant on techniques, used, input features is provided. However, time required big problem for existing machine learning methods, leads challenge all enterprises that aim transform their businesses be processed by automated workflows. Deep techniques have been utilized in...

In this paper, a surrogate model based on sparsely connected back propagation neural networks (SC-BPNN) is proposed to reduce the large computational cost of conventional multi-objective antenna optimization problems. model, connection parameters and network structure can be adaptively tuned by hybrid real-binary particle swarm (HPSO) algorithm for better global capability. Also, time-varying transfer function introduced improve problem easily trapping into local optimum accelerate...

In this paper, a terahertz (THz) metamaterial absorber (MTMA), incorporating surface Pythagorean tree fractal resonators, was designed and experimentally fabricated on the flexible substrate of polyethylene terephthalate. The design presented two peaks with strong absorption more than 97% at 0.49 0.69 THz. dual-band were seen to be shifted change in refractive index surrounding medium, corresponding sensitivity 0.0968 0.1182 THz/RIU. spectral shift reflection resonance dip utilized as an...

This paper presents a wearable metasurface multiple-input multiple-output (MIMO) antenna for biomedical applications in 5 GHz wireless body area network (WBAN) with broadband, circular polarization (CP), and high gain. The physical properties of the MIMO element principles conversion are analyzed in-depth using characteristic mode analysis. For proposed antenna, measured -10 dB impedance bandwidth is 34.87% (4.76-6.77 GHz), 3 axial ratio 22.94% (4.9-6.17 GHz). By adding an isolation strip,...

A compact printed multiband decoupled dual-antenna system for WWAN/LTE smartphone applications is presented. The proposed composed of two groups symmetrical bending structures and uses the structure slotted protruded ground to reduce coupling between elements. measured impedance bandwidth with S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> lower than -6 dB over 740-965 1380-2703 MHz obtained. isolation elements better 10 within...

A triple band metamaterial absorber in the terahertz range, incorporating a three closed circle ring resonator, was designed and fabricated on flexible polyethylene terephthalate “PET” substrate. The proposed design investigated theoretically experimentally. Computer simulation technology “CST” used to study structure, while lithography technique fabricate time-domain spectroscopy utilized measure reflectivity. Results showed presence of intensive peaks at resonance frequencies ‘0.43, 0.61,...

This paper presents a twelve-port multiple-input multiple-output (MIMO) antenna system for multi-mode 4G/5G smartphone applications. Characteristic mode analysis (CMA) is used to illustrate the operation principle and optimize geometrical structure of system. The proposed MIMO consists 4G module 5G module. 2 × array capable covering LTE700/2500/3400, GSM850/900, DCS, PCS, UTMS, 2.4-GHz WLAN, 3.5-GHz WiMAX, which two symmetrical elements, uses protruded ground improve isolation between...

Sentiment Analysis is an essential research topic in the field of natural language processing (NLP) and has attracted attention many researchers last few years. Recently, deep neural network (DNN) models have been used for sentiment analysis tasks, achieving promising results. Although these can analyze sequences arbitrary length, utilizing them feature extraction layer a DNN increases dimensionality space. More recently, graph networks (GNNs) achieved performance different NLP tasks....

A frequency-selective surface (FSS) optimization method combining a curve-fitting technique and an improved bacterial foraging (IBFO) algorithm is proposed. In the method, novel Koch curve-like FSS Minkowski fractal islands were designed with desired resonance center frequency bandwidth. The bacteria (BFO) to enhance performance of FSS. provided allow intuitive numerical analysis correspondence between structural parameters response. results are used evaluate fitness function IBFO algorithm,...

An improved binary particle swarm optimization (BPSO) algorithm is proposed for the design of high-dimensional, multifunctional, and compact fragment-type antenna (FTA). First, orthogonal array-based initialization instead randomized employed to uniformly sample space better population diversity. Then, a new transfer function with time-variant factor improve problem easily falling into local optimum in basic BPSO. Experimental results two miniaturized FTA designs show that BPSO exhibits...

A new low-profile wideband linear-to-circular polarization conversion microstrip slot antenna based on a metasurface for C-band satellite communication applications is proposed in this paper. The basically consists of four unit cells with parasitic square cross gaps arranged 2 × layout. By loading the antenna, linearly polarized (LP) waves from source are converted into circularly (CP) waves. Then, by etching three more middle metasurface, enhanced impedance bandwidth and axial ratio (ARBW)...

Major depressive disorder (MDD) is approximately twice as common in females than males. Furthermore, female patients with MDD tend to manifest comorbid anxiety. Few studies have explored the potential anatomical and functional brain changes associated females. Therefore, purpose of present study was investigate underlying females, especially within context anxiety.In this study, we recruited antidepressant-free (N = 35) healthy controls (HC; N 23). The severity depression anxiety were...

A compact, low profile, multiple-input-multiple-output (MIMO) diversity antenna with super-wideband (SWB) characteristics has been proposed. The proposed comprises four symmetric monopole-radiating elements printed on low-cost FR4 substrate the slotted ground plane. single of a monopole structure and quad-port MIMO antenna, dimensions 30 × 20 mm2 60 55 mm2, respectively, are ideal for IoT high-speed data applications. high gain envelope correlation coefficient (ECC) within frequency range....

Metamaterial absorbers are used in the terahertz frequency regime as photo-detectors, sensing elements, imaging applications, etc. Narrowband absorbers, on account of their ultra-slender bandwidth within spectrum, show a significant shift absorption peak when an extrinsic entity relative to absorber, like refractive index or temperature encircling medium, is altered. This property paves path for narrowband be potential sensors detect any alterations medium. In this paper, novel design...

In this paper, we designed and investigated a parallel double-E shaped structure based on double negative (DNG) metamaterial (MTM) both numerically experimentally, which can be utilized for multiband applications. We used the Computer Simulation Technology (CST) Microwave Studio electromagnetic simulator to design MTM obtain numerical results. The proposed has unit cell dimension of 8 × 1.57 mm3, Rogers RT 5880 was as substrate, resulting in high effective medium ratio (EMR) value 15.61. DNG...

This letter presents an ultrawideband miniaturized ultrathin flexible metamaterial absorber (MMA) based on frequency selective surface (FSS). The proposed MMA consists of inner planar helix and four groups outer convoluted lightweight indium tin oxide resistive film etched a transparent substrate polyethylene terephthalate substrate. demonstrates stable absorption across the range 1.98 to 25.88 GHz, achieving remarkable maximum fractional bandwidth 171.6%. unit cell size is 0.06...

For one-dimensional aperture synthesis microwave radiometers, the optimal placement of antenna elements in a low-redundancy linear array (LRLA) is difficult when large numbers are involved. In this paper, general structure LRLAs summarized first, and then novel stochastic optimization technique, ant colony (ACO), applied to search for low redundancy arrays. By combining with ACO procedure, an efficient method proposed rapid exploration configurations. Numerical studies show that can generate...

In this paper, a radial basis function neural network (RBFNN) surrogate model optimized by an improved particle swarm optimization (PSO) algorithm is developed to reduce the computation cost of traditional antenna design methods which rely on high-fidelity electromagnetic (EM) simulations. Considering parameters adjustment and update mechanism simultaneously, two modifications are proposed in PSO. First, time-varying learning factors designed balance exploration exploitation ability...