bluuebunny/crossref_metadata_2025_split huggingface dataset:
29‐/35 GHz Dual‐band high‐gain phase shifter with hybrid π‐networks
Authors: Wei Dong , Ding Xuan , Yu Hai , Kuan Yen‐Cheng , Gu Qun Jane , Xu Zhiwei , Ma Shunli , Ren Junyan 
Published: September 2020

This Letter presents a 29‐/35 GHz dual‐band high‐gain hybrid π‐network‐based phase shifter. The hybrid π‐network realised by combining electrical tuning through capacitors and magnetic tuning through transformers extends the phase shift range. Furthermore, the phase shift modules are inserted between the vertically stacking transistors to realise the embedded phase shifting with the minimum loss. The Gm‐stages offer the additional signal gain to offset attenuation from the passive phase shifter. This prototype, fabricated in a 28 nm CMOS process, demonstrates a 360° continuous phase shift range with a maximum gain of 22 dB at 35 GHz, and 240° continuous phase shift range with a maximum gain of 20 dB at 29 GHz. It consumes 26 mW power and 1.25 mm × 0.75 mm chip area.
Pipelined extended‐counting for 3D‐stacked CMOS image sensors
Authors: Callens N. , Lefebvre J. , Gielen G. 
Published: September 2020

A novel multi‐stage pipelined extended‐counting (EC) for 3D‐stacked CMOS image sensors is presented, which combines the benefits of a pipelined ADC, a first‐order ADC and the EC principle in order to simultaneously achieve a high resolution and a high frame rate for 3D‐stacked imagers. By assigning each stage of the pipeline to a sub‐column of pixels while choosing another input stage of the pipeline when a sub‐column has been read out, discontinuous rolling shutter artefacts like chopped images can be eliminated and frame rates up to 340 fps can be achieved for imagers with 8 K resolution.
Low‐profile ring slot SIW antenna based on higher‐order cylindrical cavity modes
Authors: Aghabeyki Peyman , Moradi Gholamreza , Sarraf Shirazi Reza 
Published: September 2020

A novel ring slot substrate‐integrated waveguides (SIW) antenna is presented based on higher‐order cylindrical cavity mode. First, TM02 is used to realise a conical beam antenna. Electric field distribution on slot aperture generates four pairs of magnetic monopoles, each rotated 90° with respect to the centre of the cavity, resulting in a conical beam. By applying an offset to the feed point, the loading effect of slots generates a hybrid mode, which is a combination of TM31 and TM12. The hybrid mode aligns the magnetic monopoles; thus, a high‐gain antenna with broadside radiation can be realised. The measured results show a 10.5% impedance bandwidth, 11.5 dBi gain, and 90% radiation efficiency. The proposed antenna is low‐profile and compact with a planar structure that could be integrated with other planar circuits; therefore, it could have many practical applications in communication systems.
Wideband circularly polarised antenna based on interelement mutual coupling effect
Authors: Zhou Peng , Huang Qiu‐Lin , Yang Lin , Li Xi , Shi Xiao‐Wei 
Published: September 2020

This study presents a circularly polarised (CP) antenna with a wideband characteristic, which is caused by the interelement mutual coupling effect. The proposed antenna consists of a dipole array with four elements in centre symmetry and a wideband feed network. In order to extend the lowest working frequency, a strong mutual coupling effect is introduced to the adjacent co‐polarisation elements. What's more, the introduced effects of capacitive coupling reactance counteract the effects of the element's inductively reactive ground plane. Then, a small, tightly coupled array is formed that possesses wide impedance bandwidth and orthogonal polarisation component. A wideband feed network, including Wilkinson power dividers, phase shifters, and impedance converters, is designed to provide amplitudes and phases excitation that circular polarisation antenna required. Finally, a prototype is fabricated and tested. Measured results show a VSWR<2 impedance bandwidth of 102.7% (2.09–6.5 GHz) and a 3‐dB axial ratio bandwidth of 94.2% (2.25–6.25 GHz). Besides, a relatively stable gain is realised across the operating band.
Precision indoor three‐dimensional visible light positioning using receiver diversity and multi‐layer perceptron neural network
Authors: Mahmoud Abdulrahman A. , Ahmad Zahir Uddin , Haas Olivier C.L. , Rajbhandari Sujan 
Published: September 2020

In recent times, several applications requiring highly accurate indoor positioning systems have been developed. Since the global positioning system is unavailable/less accurate in the indoor environment, alternative techniques such as visible light positioning (VLP) are considered. The VLP system benefits from the wide availability of illumination infrastructure, energy efficiency and the absence of electromagnetic interference. However, there is a limited number of studies on three‐dimensional (3D) VLP and the effect of multipath propagation on the accuracy of the 3D VLP. This study proposes a supervised artificial neural network to provide accurate 3D VLP whilst considering multipath propagation using receiver diversity. The results show that the proposed system can accurately estimate the 3D position with an average root mean square (RMS) error of 0.0198 and 0.021 m for line‐of‐sight (LOS) and non‐LOS link, respectively. For 2D localisation, the average RMS errors are 0.0103 and 0.0133 m, respectively.
Gain‐flattened hybrid EDFA operating in C + L band with parallel pumping distribution technique
Authors: Al‐Azzawi Alabbas A. , Almukhtar Aya A. , Dhar Anirban , Paul Mukul C. , Ahmad Harith , Altuncu Ahmet , Apsari Retna , Harun Sulaiman Wadi 
Published: September 2020

A novel C + L band hybrid erbium‐doped fibre amplifier (EDFA) using a two‐stage configuration was proposed and demonstrated experimentally. The amplifier is composed of a 0.5‐m long hafnium bismuth erbium co‐doped fibre (EDF) to provide gain within the C‐band and a 4‐m long zirconia‐based EDF to provide gain within the L‐band. The proposed amplifier was examined based on the multi‐wavelength input source. A parallel pumping distribution technique was used to mitigate the amplifier complexity. The C + L band amplifier achieved a gain flattening of over 55 nm bandwidth for the three levels of the input powers. A gain‐flattening of roughly 10.9, 15.5, and 19.2 dB were obtained, respectively, for the input signal powers of −5, −10, and −15 dBm. An average noise figure of 6.4, 5.4, and 4.7 dB was achieved, respectively, for the input signal powers of −5, −10, and −15 dBm.
Predictive torque control of induction motor with integrated DC‐link voltage optimisation
Authors: Karlovsky Pavel , Lipcak Ondrej , Bauer Jan , Lettl Jiri 
Published: September 2020

This study proposes a new method leading to a reduction in the current and torque ripple of an induction motor (IM) drive controlled by predictive torque control (PTC). The method lies within the optimisation of a DC‐link voltage magnitude by the PTC cost function. Using a three‐phase silicon‐controlled rectifier, the DC‐link voltage can be adjusted in such way that the current and torque ripple, caused mainly by treating the inverter as a source of only eight voltage vectors, is significantly reduced. The DC‐link optimisation algorithm is integrated into the PTC that is used for the torque and flux control. In another prediction stage, the influence of the DC‐link voltage on the torque and flux ripple is directly evaluated and then optimised by a second cost function. The theoretical analysis of the DC‐link voltage influence on the drive behaviour is supported by simulation and experimental results conducted on a 5.5 kW IM drive, which confirm the benefits of the PTC with the DC‐link voltage optimisation, especially if the drive operates in a region below the nominal speed.
Analysis and design of LLC resonant converter with variable magnetising inductance control
Authors: Wei Yuqi , Luo Quanming , Chen Jian , Alan Mantooth Homer 
Published: September 2020

A conventional pulse frequency modulation (PFM) controlled LLC resonant converter requires a wide switching frequency operating range to regulate the output voltage. There are some disadvantages of PFM LLC resonant converters: (i) the design and optimisation of magnetic components and gate driver circuitry are challenging; (ii) due to the variable switching frequency operating range, electro‐magnetic interference performance of the converter is degraded; (iii) efficiency degradation; (iv) inability to achieve independent control in multiple‐output applications. To address the above‐mentioned problems and achieve fixed switching frequency operation, a variable magnetising inductance control (VMIC) strategy is proposed. In the proposed VMIC control strategy, the operating switching frequency of the primary switch is fixed and the duty cycle remains constant at 0.5. At the resonant frequency operating point, the output voltage is independent of both the magnetising inductance and load. In addition, the zero current turn‐off operation of the secondary rectifier requires that the switching frequency be designed below the resonant frequency. The operational principles and design considerations of the LLC resonant converter with VMIC are presented. Experimental results from a 200 W prototype are presented to validate the theoretical analysis and the effectiveness of the proposed VMIC control strategy.
Analytical estimation of parasitic capacitances in high‐voltage switching transformers
Authors: Mirzadarani Reza , Mohammadi Hamid Reza , Ketabi Abbas , Motahari Seyed Reza , Ghorbani Alimorad 
Published: September 2020

Parasitic capacitances in transformers consist of three main groups: winding‐to‐winding, layer‐to‐layer, and stray capacitances. Stray capacitance is also made of turn‐to‐turn and turn‐to‐core capacitances. This study presents a novel analytical method for calculating the values of turn‐to‐turn, turn‐to‐core, and stray capacitances in each winding, and employs the results to calculate the equivalent parasitic capacitance especially for high‐voltage switching transformers. The proposed analytical method introduces an explicit formula in terms of the winding and core dimensions. This formula can be applied in performance analysis and design optimisation methods. By utilising the proposed formula, calculation of the equivalent parasitic capacitance neither takes a great deal of time nor requires a particular computer system. The analytical results are verified by simulation results using the finite‐element method and experimental results achieved by a practical prototype of a high‐voltage switching transformer employed in a 390 W, 15 kV inductor–capacitor–inductor–capacitor resonant converter.
Accuracy of meteor positioning from space- and ground-based observations
Authors: Chen Hongru , Rambaux Nicolas , Vaubaillon Jérémie 
Published: September 2020

Aims. The knowledge of the orbits and origins derived from meteors is important for the study of meteoroids and of the early solar system. With an increase in nano-satellite projects dedicated to Earth observations or directly to meteor observations (e.g., the Meteorix CubeSat), we investigate the stereoscopic measurement of meteor positions using a pair of cameras, one deployed in space and one on the ground, and aim to understand the accuracy and the main driving factors. This study will reveal the requirements for system setups and the geometry favorable for meteor triangulation.
Methods. This Letter presents the principle of the stereoscopic measurement from space and the ground, and an error analysis. Specifically, the impacts of the resolutions of the cameras, the attitude and orbit determination accuracy of the satellite, and the geometry formed by the moving target and observers are investigated.
Results. To reach a desirable positioning accuracy of 1 km it is necessary to equip the satellite with high-accuracy sensors (e.g., star tracker and GPS receiver) to perform fine attitude and orbit determination. The best accuracy can occur when the target is at an elevation of 30° with respect to the ground station.
Effect of Plate Type and Working Length on a Synthetic Compressed Juxta-Articular Fracture Model
Authors: Bird Guy , Glyde Mark , Hosgood Giselle , Hayes Alex , Day Rob 
Published: September 2020

Abstract
Objective This investigation compared the biomechanical properties of a 2.0 mm locking compression notched head T-plate (NHTP) and 2.0 mm straight locking compression plate (LCP), in a compressed, short, juxta-articular fragment fracture model.
Methods Two different screw configurations were compared for the NHTP and LCP, modelling short (configuration 1) and long working length (configuration 2). Constructs were tested in compression, perpendicular and tension four-point bending and torsion. Plate surface strain was measured at 12 regions of interest using three-dimensional digital image correlation. Stiffness and strain were compared.
Results The LCP was stiffer than the NHTP in all three planes of bending (p < 0.05). The NHTP was stiffer than the LCP in torsion (p < 0.05). The NHTP had greater strain than the LCP during compression bending and torsion (p < 0.0005). The short working length NHTP was stiffer in all three planes of bending and in torsion (p < 0.05) than the longer working length. The short working length LCP was stiffer in compression bending and in torsion (p < 0.05) than the longer working length. The long working length showed greater strain than the short working length at multiple regions of interest.
Conclusion In this experimental model of a compressed transverse fracture with a juxta-articular 9 mm fragment, a 2.0 mm LCP with two hybrid screws in the short fragment was stiffer than a 2.0 mm NHTP with three locking screws in the short fragment in three planes of bending but not torsion. Extending the working length of each construct reduced construct stiffness and increased plate strain.
Antecedents of intentional and incidental exposure modes on social media and consequences for political participation: a panel study
Authors: Nanz Andreas , Heiss Raffael , Matthes Jörg 
Published: September 2020

AbstractThis study investigates antecedents and consequences of incidental and intentional exposure behavior to political information on social media. Based on the Social Media Political Participation Model (SMPPM), we investigated how political and non-political motivations predict intentional and incidental exposure modes while accounting for moderators (i.e., personal curation skills and the frequency of social media political exposure). We also examined how intentional and incidental exposure modes affect low- and high-effort political participation. We rely on data from a two-wave panel survey based on representative quotas for the Austrian population (N = 559) to run autoregressive models. Political information motivation predicted the intentional mode, and this relationship was stronger with rising levels of curation skills. By contrast, entertainment and social interaction motivations increased individuals’ incidental exposure mode. The intentional mode led to low-effort political participation but not to high-effort participation. However, the incidental mode was unrelated to both low- and high-effort participation.
How does playing position affect fatigue‐induced changes in high‐intensity locomotor and micro‐movements patterns during professional rugby union games?
Authors: Fornasier‐Santos Charly , Millet Grégoire P. , Stridgeon Paul , Brocherie Franck , Girard Olivier , Nottin Stéphane 
Published: September 2020

AbstractWe questioned whether changes in high‐intensity locomotor and micro‐movements patterns between the first and second part of each half depend on playing position in the 2014–2015 European rugby union championship winning team. Thirty‐three rugby players were grouped according to five playing positions. Players were equipped with micro‐electromechanical system including a GPS sampling at 10 Hz and high temporal resolution micro‐sensors during 17 Top14 and 7 European games. High‐speed movements (HSM), high‐intensity accelerations (HIA), repeated high‐intensity efforts (RHIE), and high‐intensity micro‐movements (HIMM) were subsequently compared between four 20‐min game periods. No significant group × time interactions were observed for any locomotor variables (p > 0.283). Irrespectively of playing position, the number of HSM (p = 0.019), decreased from 0–20 min to 60–80 min as well as from 40–60 to 60–80 min (p < 0.001) with HIA (p = 0.020) and RHIE (p < 0.001). Significant group × time interaction was found for HIMM (p = 0.03) with a significant decrease observed in back row forwards from 0–20 to 60–80 min periods (−17.5%; ES = 0.6; p = 0.031). In elite rugby union, fatigue‐induced changes during the last 20 min are independent from playing positions in high‐intensity locomotor patterns in contrary to HIMM. Training drills that include specific RHIE (high‐speed and HIA efforts) may be useful to postpone match‐related fatigue.
Personality traits, stress appraisals and sleep in young elite athletes: A profile approach
Authors: Nédélec Mathieu , Lienhart Noémie , Martinent Guillaume , Doron Julie 
Published: September 2020

AbstractThe aim of this study was to identify young elite athletes’ personality profiles using a person‐centred approach and to investigate whether the profiles significantly differ in stress and sleep. 260 athletes from a variety of sports completed a questionnaire package to assess neuroticism and conscientiousness traits, stress appraisals (i.e. intensity and directional interpretation of stress, challenge and threat appraisals), and various indicators of sleep (i.e. sleep quality, social jet lag, Ford insomnia response to stress test (FIRST)). A latent profile analysis (LPA) approach was used to identify personality profiles based on the scores of neuroticism and conscientiousness. A multivariate analysis of variance was performed to examine if the athletes belonging to different personality profiles differ on stress appraisals and indicators of sleep. Three profiles emerged: Maladaptive profile (high levels of conscientiousness and neuroticism); Highly adaptive profile (moderate level of conscientiousness and low level of neuroticism); Adaptive profile (high level of conscientiousness and moderate level of neuroticism). Results showed that athletes from the adaptive profile reported significantly lower scores of stress intensity and threat appraisal than those from other profiles. Athletes from the maladaptive profile reported significantly higher levels of FIRST than those from other profiles as well as worse sleep quality and lower levels of challenge appraisal than the athletes from the highly adaptive profile. These results suggest that investigating personality profile may be useful in identifying athletes at higher risk of stress sensitivity and worsening sleep that are likely to benefit from preventive actions (e.g. cognitive behavioural therapy interventions).
The factor affecting heat stress in industrial workers exposed to extreme heat: A case study of methodology
Authors: Rasdan Ismail Ahmad , Jusoh Norfadzilah , Amin Mahd Asri Mohd , Md Zein Raemy , Abdul Rahman Ismail , Kamilah Makhtar Nor , Mohamed Darliana 
Published: September 2020

Abstract
Excessive heat during work creates occupational health risks; it restricts a worker’s physical functions and capabilities, work capacity and productivity. Temperatures above 24–26 °C are associated with reduced labour productivity. Exposure to excessive heat levels can lead to heatstroke, sometimes even with a fatal outcome. The aim of this study is to discuss the methodology in experimental of the factor affecting heat stress in industrial workers exposed to extreme heat. The experiment will be conducted in an environmental chamber which simulates the same environment of the manufacturing industry and another arrangement which simulates the environment of a construction industry. The environmental parameters will be recorded such as the temperature, relative humidity and also the physiological parameters such as the volume oxygen uptake level and the heart rate. The heart rate and the volume of oxygen uptake will be recorded for a 15-minute interval for one shift (2 shift-manufacturing and construction). This study is conducted based on two tasks in two different conditions, outdoor and indoor. It simulates the lifting work at both manufacturing and construction industry. For manufacturing industry, the subjects are demanded to lift boxes (10kg). Meanwhile, for the construction industry, the subjects are demanded to lift a sand bag (10kg). From this study, the optimum values of temperature and humidity can be obtained which can lead to the optimum workers’ performance. The increase of performance will ensure the production level at the manufacturing industries at its best and will lead to monetary gain. Besides, this can ensure that a construction project can be delivered at the right time while reducing the cost lost and the accidents at the site.
A Modified GAN for Compressed Sensing MRI
Authors: Geng Zelong , Tao Jinxu , Xu Jinzhang 
Published: September 2020

Abstract
Magnetic resonance imaging is a commonly used diagnosis method in medicine. Most reconstruction methods are based on the compressed sensing theory, while it is inefficient and time-consuming. In recent years, deep neural networks have developed rapidly. GAN architecture has been widely used in various image tasks after published. This paper proposes a new MRI reconstruction method RISEGAN. The generator uses U-Net structure to extract multi-scale features in the down sampling and up sampling modules. Combined with the residual learning and squeeze excitation blocks, the mapping between the under sampled and the fully sampled image is established. Experiment results show that our method can finish reconstruction with premium quality. Evaluation indicators have also improved.
Dual Channel Attention Networks
Authors: Bian Jingchen , Liu Yugui 
Published: September 2020

Abstract
Channel attention is currently widely used in Computer Vision. Most existing channel attention networks are proposed based on Squeeze-and-Excitation Networks (SE- Net),which can obtain excellent performance by designing complex structures, however, they also has more additional network parameters and higher floating point operations per second (FLOPs). We propose a novel lightweight attention structure called Dual Channel Attention Networks (DCA-Net). By introducing the channel attention preprocessing module and using 1-D convolution with K=1, DCA-Net has a more straightforward and delicate structure. We add DCA-Net to ResNet and perform image classification experiments on CIFAR-100 dataset, object detection and instance segmentation experiments on MS-COCO dataset. Experimental results show that our DCA-Net achieves better results than the existing attention networks, such as SE-Net, ECA-Net and so on. For example, in the image classification task on CIFAR-100, the parameter amount of DCA-Net using ResNet-50 decreases by 50.03 compared to SE-Net using ResNet-101, and decreases by 44.48 compared to ECA-Net using ResNet-101, GFLOPs decreased by 48.41 and 48.21, respectively. At the same time, the Top-1 accuracy of DCA-Net using ResNet-50 is 0.3 higher than that of SE-Net using ResNet-101, and 0.86 higher than that of ECA-Net using ResNet-101.
A Smoothing-Type Algorithm for Solving Monotone Weighted Complementarity Problems
Authors: Jiang Xiaoqin , Huang Yujin 
Published: September 2020

AbstractThe weighted complementarity problem is an extension of the standard finite dimensional complementarity problem. It is well known that the smoothing-type algorithm is a powerful tool of solving the standard complementarity problem. In this paper, we propose a smoothing-type algorithm for solving the weighted complementarity problem with a monotone function, which needs only to solve one linear system of equations and performs one line search at each iteration. We show that the proposed method is globally convergent under the assumption that the problem is solvable. The preliminary numerical results indicate that the proposed method is effective and robust for solving the monotone weighted complementarity problem.