Miracle-dz/UniFAR-FTUs huggingface dataset:
Comparison of Receptive Verbal Abilities Assessed Using the KBIT-2 and BPVS3 in Adults With Down Syndrome

Down syndrome (DS) is the most common genetic cause of intellectual disability. There is, however, considerable variation in cognitive abilities between those with DS, with some individuals scoring at floor on some tests, particularly for age-standardised outcomes. This variation and these floor effects can pose a problem for comparing and combining study populations when different standardised measures have been used to assess individuals’ cognitive abilities, for example combining results across studies to investigate genetic or other factors associated with cognitive abilities. To facilitate this comparison and combination of study populations assessed using different tests of verbal abilities, we administered two commonly used standardised tests of receptive language, the Kaufmann Brief Intelligence Test 2 (KBIT-2) verbal scale and the British Picture Vocabulary Scale 3 (BPVS3) to 34 adults with DS (age range 19–59) to investigate relationships between outcomes for these two tests. We found a very strong correlation between raw scores for the KBIT-2 verbal scale and the BPVS3, and determined equations to convert between scores for the two tests. Intraclass correlations between the two scales for age-equivalents and calculated z scores relative to population norms were also strong, though scores for both outcomes were significantly higher for the KBIT-2 verbal scale compared to the BPVS3. This deviation in scores between the two tests was greater as z scores decreased for both tests (i.e., for lower scoring individuals), with no such relationship observed for age-equivalents. These results indicate the conversion of raw scores between the KBIT-2 verbal scale and the BPVS3 may be a more valid method for the comparison or combination of study samples with DS compared to the use of standardised scores. Such comparisons or combinations will aid our understanding of cognitive variations and factors associated with these variations within the population with DS.
A Visualized Analysis of Game-Based Learning Research from 2013 to 2017

This study aims to make a visualized analysis of game-based learning (GBL) research so as to provide more insights into the research quantity, categories, regions, the most influential scholars and the research hotspots. This paper analyzed the articles and proceeding papers derived from Web of Science (WOS) in the field of game-based learning from 2013 to 2017. A total of 1818 publications were selected and analyzed by the CiteSpace, which was a freely java application to analyze and visualize the trends of scientific publications. The results indicated that the quantity of game-based learning research presents a growth tendency from 2013 to 2017. The category of Education & Educational Research were the most common category in this field. Mozelius P was the most influential researchers. Furthermore, it was found that serious game, motivation, education and gamification were the most frequently used words in the field of game-based learning. Serious game, environment, motivation, gamification, mathematic and Intelligent tutoring system were the research hotspots in this domain. The implications and limitations were also discussed in detail.
Millimeter-Wave Microstrip Antenna Array Design for Future 5G Cellular Applications

5G denotes the next major phase of mobile telecommunications standards beyond the current 4G, which will operate at millimeter-wave frequency band. In any wireless device, the design of an efficient antenna has a positive impact on overall system performance. This paper presents a high gain millimeter-wave microstrip antenna array with a simple profile structure - Operating at 29.8 GHz. Based on the best optimized single element patch, a 4 element patch array antenna is proposed. The antenna's is designed on a compact Roger RO3006 substrate with relative permittivity (ε r) of 6.15 having dimensions 7×14.5 × 0.13 mm3 for 2×1 and 9 × 27 × 0.13 mm3 for 4×1 at the resonant frequency of the antenna is 29.8 GHz. Return loss, VSWR and radiation patterns were simulated by ANSOFT HFSS. The simulation result of VSWR was compared to this obtained by CST MWS.
Preamble Detection for Underwater Acoustic Communications Based on Sparse Channel Identification

Preamble detection before data transmission is an important module for an underwater communication system, since false detections would bring undesirable consequences in terms of the lifetime and coexistence of underwater networks. This paper conducts a thorough investigation of preamble detection in adverse underwater acoustic channels in the presence of various external interference, such as narrowband interference, impulsive noise, partial-band partial-block-duration interference, and chirps from nearby systems—The Gaussian noise model is not sufficient. We propose two novel detection methods based on the inherent sparsity of underwater acoustic channels: The first method declares signal detection when a sparse signal reconstruction is successful, whereas the second method accumulates the correlation coefficients from multiple paths instead of just the strongest path. We study the performance of the proposed methods based on simulations and experimental data sets, where the detection thresholds are empirically obtained. Performance results testify to the clear advantages of the proposed detection methods relative to existing matched-filter based approaches in various interference conditions.
Low Frequecy Surface Plasmon Waves on Metal Structured Surface with a Variable Effective Period Subwavelength Rectangular Groove Grating Using Periodically Photoinduced Semiconductor Plasma

The propagation characteristics of low frequency surface plasmon waves on structured perfect electric conductor (PEC)surfaces with a variable effective period subwavelength rectangular groove grating using periodically photoinduced semiconductor plasma are theoretically investigated, using mode matching technique. The Bragg interaction and the leaky wave characteristic of the low frequency surface plasmon waves are theoretically discussed through the numerical result of the dispersion diagram.
A Novel Dual-Polarized Planar Antenna

A wideband dual-polarized antenna with a novel planar configuration is presented for base station applications. Two groups of simple dipoles are fed by two microstrip feed networks to achieve ±45° polarizations. A novel feeding technique that leads to a planar configuration is described. Measured results show that excellent matching and stable radiation performances are achieved over a wide band.
Classification of LiDAR Point Cloud based on Multiscale Features and PointNet

Aiming at classifying the feature of LiDAR point cloud data in complex scenario, this paper proposed a deep neural network model based on multi-scale features and PointNet. The method improves the local feature of PointNet and realize automatic classification of LiDAR point cloud under the complex scene. Firstly, this paper adds multi-scale network on the basis of PointNet network to extract the local features of points. And then these local features of different scales are composed into a multi-dimensional feature through the fully connected layer, and combined with the global features extracted by PointNet, the scores of each point class are returned to complete the point cloud classification. The deep neural network model proposed in this paper is verified using the Semantic3D dataset and the Vaihingen dataset provided by ISPRS. The experimental results show that the proposed algorithm achieves higher classification accuracy compared with other neural networks used for point cloud classification.
Optimal design of an interior permanent magnet in-wheel motor for electric off-road vehicles

Interior permanent magnet in-wheel motor exhibits advantages of four-wheel independent drive and wheel-slip based steering, high efficiency and power density, wide field weakening capability, and more space within the vehicle, which is desirable for electric off-road vehicles. Since the motor flux linkage model is established by polynomial fitting, an optimization-based motor analysis model is proposed to handle the torque requirement and voltage constraint using Lagrange multiplier. To simplify the motor efficiency optimization problem, voltage constraint is neglected without efficiency alteration theoretically. Then an initial optimization of a motor with 16 poles and 18 slots is performed, before the number of turns per coil is chosen to meet the voltage constraint. Finally, the efficiency map of the optimal designed in-wheel motor is presented to validate the proposed method.
Beam Steering Capabilities of a Fully Dielectric Antenna Array

In this paper, the beam steering capabilities of a fully dielectric antenna array made out of Rexolite are investigated. The antenna array, which is designed for W-band frequencies, consists of four dielectric rod antennas fed by a special power divider, which is based on a multimode interference phenomenon. In order to achieve different beam steering angles, different lengths of the dielectric waveguides, feeding the rod antennas are used. Two different beam steering configurations are designed, providing a beam direction of 15° and 8° at 95 GHz. The measured antenna patterns are in good agreement to the simulations with side lobe levels between -6.2 to -10.5 dB.
Monolithic 3-D Printed Spherical-Resonator-Based Olympic-Topology Bandpass Filters

This paper presents RF design and implementation of millimeter-wave bandpass filters (BPFs)based on high-quality-factor spherical resonators that are configured in an Olympic-shape coupling topology. This type of filtering topology is superior in an improved high-side out-of-band rejection due to the suppression of higher order modes of the spherical resonator. Fifth-order Olympic-topology BPFs are demonstrated at Ku and Ka bands by using direct-metal-laser-sintering and stereolithography (SLA)3-D printing techniques, respectively. Electroless copper/silver plating is employed for the surface metallization of the SLA-printed filter.
Radiation Patterns of an RF Energy Harvesting Necklace on Human Body Phantom

The far-field electromagnetic radiation patterns of different dipole antennas used for an RF energy harvesting necklace for smart jewelry are studied. Rigid Vee, V-shaped copper and flexible silver-ink dipoles are explored with and without a human body phantom. Measurements demonstrate the advantages of Vee or V-shaped dipoles for harvesting more RF energy at the sides of the human body compared to a straight dipole. The flexible RF energy harvesting necklace can produce 72.2 µW at 5.3 m from a 3 W EIRP 915 MHz RF transmitter when worn by a person.
Phased Antenna Array Calibration Based on Compressed Sensing Theory

This paper presents a calibration technique for phased array radars. The real embedded patterns of the array elements are measured independently in operating mode, taking antenna coupling and other parasitic effects into account. A set of angular dependent error coefficients used for the calibration process are extracted from the received signals by making use of a suitable compressed sensing based approach.
A Research for Miniaturized Circular Polarization Antenna

A new design of a miniaturized circular polarization antenna element is proposed and presented for antenna array. The antenna-size reduction is achieved by adding four centrosymmetric ‘P-shaped slots end to the edge of a octagonal patch at the corner. It is very slight also comparing with common patch antenna. In order to get a compact and facile design producing circular polarization electromagnetic wave, two L-shaped feed line with vertical coaxial line ends to a microstrip transmission line runs parallel to the patch is used. The structure of the antenna and feed is studied and simulated with HFSS on computer.
Toward Semantic Action Recognition for Avocado Harvesting Process based on Single Shot MultiBox Detector

To date, human action recognition is still a challenging topic and has been addressed from many perspectives. Detection of human actions can be useful to obtain relevant information to improve complex processes, which is the case of agricultural applications. In this work, the detection of objects that can provide information for human action recognition based on semantic representations is studied. For this purpose, a convolutional neuronal network based on Single Shot MultiBox Detector meta-architecture and MobileNet feature extractor was implemented, which has been trained to detect nine classes of objects during the process of collecting avocados in a Chilean farm. We have found that such detected objects are related to seven possible actions that can be detected during avocado harvesting process. Such information could allow to directly detect certain actions in still images, or improve conventional action detection methods during the harvesting process. The results show that is possible to detect human actions during the process, obtaining action recognition performances from 41% to 80% depending on the task. This approach can help to obtain information about how to improve harvesting process and reduce human workload in near future, which may be an important contribution for the search of sustainable agricultural practices.
On the Design of Conformal Radomes for Beam-shaping of Antennas

In this paper, we describe a systematic approach to synthesizing conformal radome. , comprised of phase shift structures (PSSs). , which is designed to reshape the primary beam in a desirable way. The reshaping technique proposed herein is based on the application of Generalized Law of Refraction (GLR). The design procedure for the beam-shaping conformal radome is discussed and a design example is presented to demonstrate that the reshaping technique can be used to successfully modify the primary beam of a feed horn, placed behind the radome, to a flat-top radiation pattern, which was our desired goal.
Trends and Challenges of Predictive Control in Power Electronics

Predictive control is a new control strategy that has been applied to power electronics applications in the last decades. This paper introduces some of the most recent challenges and trends through an overview on papers. The review is done based on recent publications, showing that despite enormous progress in this area, there are still some issues that need to be solved.
Analysis and Design of a Circularly-Polarized Planar Leaky-Wave Antenna

We present the design and analysis of a K-band radially-periodic leaky-wave antenna radiating a circularly polarized broadside pencil beam. The structure is constituted by a metallic strip grating printed on top of a single-layer grounded dielectric slab, and is fed on the bottom by means of a square array of printed surface-wave launchers. The structure is optimized to support the fast $n$ = -1 spatial harmonic, whose behavior has been accurately characterized through a full-wave dispersive analysis developed by means of an in-house method-of-moments (MoM) code. By proper phasing the four independent feeding points, linear or circularly polarized pencil beams can be obtained by exciting a dominant but weakly-attenuated, cylindrical TM leaky-wave mode. In this way, highly-directional broadside pencil beams showing good polarization purity can be obtained. The proposed design is of interest for modern satellite and terrestrial point-to-point communications.
Conformal Continuous Tanrsverse Stub Antenna based on SIW Technology for 5G Applications

In this paper, a compact and low cost conformal continuous transverse stub antenna based on SIW technology for 5G applications is presented. The antenna is designed on a substrate integrated waveguide structure. This antenna is designed to work for the next generation 5G wireless communication systems. The proposed antenna is printed on a microstrip layers topology in order to make the design easy and more compact. This antenna is able to provide a good levels of gain (12dBi) with a good result in terms of return and insertion losses. Moreover, with the use of the SIW technology, the proposed CTS antenna has low cost and can be used as self-packaged.
An algorithm for feature extraction and detection of pulmonary nodules in digital radiographic images

This work proposes a method for feature extraction and detection of pulmonary nodules in digital radiographic images, as little visualization and highlighting of these features often prevent a deeper diagnosis in chest radiographs. The proposed method involves digital image processing techniques such as re-quantization, gamma correction, OTSU thresholding, projection analysis, convergence filter, dilation, erosion and geometric filters. The proposed algorithm has a sensitivity of 91%, specificity of 96% and precision 94% with a referential database of 50 chest radiographs.
Design of Fault-Tolerant Dual Three-Phase Winding PMSM for Helicopter Landing Gear EMA

On modern rotorcraft, electro-mechanical actuators (EMAs) are progressively replacing the bulky and more expensive hydraulic and/or pneumatic systems. Although the migration towards alternative actuation solutions, reliability remains a key requirement for aerospace applications. Fault-tolerant electrical machines are often employed for ensuring the demanded reliability level. In this paper, the design of a dual three-phase winding permanent magnet synchronous machine (PMSM) for helicopter nose landing gear extension/retraction EMA is addressed. Finite element (FE) simulations are used for evaluating the PMSM performance in both healthy and faulty conditions. The compensation strategy implemented on the healthy three-phase winding, while the second one is completely shorted, is also discussed. Finally, a purposely built dual three-phase winding PMSM model is implemented in Dymola environment, where the extension/retraction EMA is simulated. Hence, EMA behaviour under both healthy and faulty conditions is analysed.
A Novel Harmonic Current Control Algorithm for Torque Ripple Reduction of Permanent Magnet Synchronous Motors for Traction Application

This paper presents a novel control algorithm for high-torque low-speed permanent magnet synchronous motors for direct drive applications. A new induced voltage based formulation of the electromagnetic torque is developed and a novel current control algorithm is designed to reduce the torque ripples which are originated from the flux harmonics. A prototype motor with relatively high induced voltage harmonics is designed and constructed and the experiment results of the Harmonic control algorithm are compared to the results of a conventional Field Oriented Control.
Broadband Circularly Polarized Printed Antenna with Quad-crossed Dipobles

A broadband circularly polarized (CP) printed antenna with a quad-crossed dipoles is proposed, fabricated and measured. The antenna consists of a trapezoidal transformation balun, a three-quarter annular transmission line (TL) and four radiant dipoles. The total size of the proposed antenna is 70×70×2 mm3. This printed planar antenna achieves an impedance bandwidth of 48.5% (1.59-2.61 GHz) for the voltage standing wave ratio (VSWR) < 2. The 3 dB axial ratio (AR) bandwidth is 33.4% (1.59–2.26 GHz). A peak gain of 2.8 dBic and a half power beam width (HPBW) more than 116° are achieved.
Circulary- Polarizated Substrate-Integrated Discrete Lens Using Sequential Rotation Schemes and Linearly Polarized Unit-Cells

A 60-GHz circularly-polarized discrete lens integrated on a dielectric substrate is presented in this paper. A sequential rotation scheme is used with linearly polarized unit-cells to achieve a wide axial ratio bandwidth. Measurements on a 32-mm diameter and 13.2-mm thickness prototype showed a 3-dB axial ratio and a 3-dB gain bandwidths of 27.4% and 15.6% respectively. A broadside gain of 18.2 dBi is also achieved.
Case Study of Reactive and Embedded System Design Modeled with Petri Nets

This paper exposes the application of the design and development methodology for an access control embedded system, uncoupling the logic, fire policy, and actions. Thus, the proposed methodology makes the final system modular, simple, maintainable, formal, and flexible; allowing for the formal verification of the logic in the earlier stages of development. The system’s logic is modeled using the Petri net´s generalized state equation that enables the resultant logic model to be executable using a monitor. The monitor integrates the Petri net, the policy, and the actions, creating a heterogeneous system that adds the ability to verify the system with the mathematics formalisms of the used model. In addition, the advantages of applying the proposed methodology to the design of an embedded, critical, and reactive real system are revealed in the addressed case. Keywords — Reactive systems design, event-driven architecture, Petri Nets, Concurrent programming, Concurrency Monitor, Design Pattern.
System Framework of Robotics in Upper Limb Rehabilitation on Poststroke Motor Recovery

Neurological impairments such as stroke cause damage to the functional mobility of survivors and affect their ability to perform activities of daily living. Recently, robotic treatment for upper limb stroke rehabilitation has received significant attention because it can provide high-intensity and repetitive movement therapy. In this review, the current status of upper limb rehabilitation robots is explored. Firstly, an overview of mechanical design of robotics for upper-limb rehabilitation and clinical effects of part robots are provided. Then, the comparisons of human-machine interactions, control strategies, driving modes, and training modes are described. Finally, the development and the possible future directions of the upper limb rehabilitation robot are discussed.
Formulation of Surface-Volume-Surface-EFIE for Solution of 2D Scattering Problems on Composite Dielectric Objects under TM Polarization

This work generalizes the Surface-Volume-Surface Electric Field Integral Equation (SVS- EFIE) for the solution of the 2D scattering problems on the composite penetrable non-magnetic objects under TM polarization. The SVS-EFIE formulation for homogeneous scatterers features a single unknown surface current density on the boundary. In order to generalize SVS- EFIE to the case of composite scatterers, two independent electric surface current densities must be introduced on the joint boundaries between different dielectric materials. On each of the remaining boundaries between the scatterer and the background medium only a single unknown surface current density is introduced similarly with the original SVS- EFIE. To validate the new formulation its solution is compared against solution of the traditional Volume-EFIE (V-EFIE).
Tissue iron is negatively correlated with TERC or TERT mRNA expression: a heterochronic parabiosis study in mice

To test the hypothesis that iron accumulation in tissues with age is a key harmful factor for the development of aging, we established heterochronic parabiosis-pairings and investigated changes in serum iron, the expression of major iron transport proteins and iron contents, as well as telomerase reverse transcriptase (TERT), telomerase RNA component (TERC), and telomere length in the liver, kidney and heart of Y-O(O) (old pairing with young), Y-O(Y) (young pairing with old), O-O (pairings between two old) and Y-Y (pairings between two young) mice. We demonstrated that the reduced serum iron, increased iron and reduced expression of TERT and TERC in the tissues of aged mice are reversible by exposure to a younger mouse’s circulation. All of these measurements in young mice are reversible by exposure to an older mouse’s circulation. Correlation analysis showed that tissue iron is negatively correlated with TERT and TERC expression in the liver, kidney and heart of parabiotic mice. These findings provide new evidence for the key role of iron in aging and also imply the existence of rejuvenating factors in young serum with an anti-ageing role that act by reversing the impaired activity of iron metabolism in old mice.