Miracle-dz/UniFAR-FTUs huggingface dataset:
The Usage of the Johnson-Cook Constitutive Model in the Finite Element Analysis of the Caulking Process

The present paper highlights the importance of generating a model for analysing the caulking process. The caulking operation is a fast, cost-efficient, cost-effective way of assembling, which is currently less studied in world-wide papers. The operation is at the border between plastic deformation and cutting process. It is therefore necessary to create a model to describe the process. In the paper are presented the main examples of applications, the main parameters that characterize the process, the current state of the cutting and plastic deformation models. After the analysis we concluded that the most valuable model for describing plastic deformations is the Johnson-Cook model. This information is the basis for developing a model for describing the caulking process.
International Journal of Sensor Networks and Data Communications

Since the adoption of Bluetooth Low Energy (BLE) in the Bluetooth standard in 2010, BLE beacons are emerging as one of the most viable solutions for indoor localization due to its power efficient architecture, short scan duration, low cost chipset, and wide adoption in the devices. The existing indoor positioning systems based on BLE beacons employ the classical fingerprinting (FP) technique where user terminals collect signals from the beacons and do most of localization computations, requiring significant power consumption on user devices. However, constant power consumption on limited battery life of a mobile device can be problematic when it comes to supporting server-oriented tracking applications. To address this issue, we have proposed a new fingerprinting technique called inverse fingerprinting (Inv-FP), which is a server side BLE fingerprint system where most of the positioning computations are done by BLE sniffers and servers, thus minimizing the computation overhead of user devices. However, the absolute positioning schemes such as FP and Inv-FP do not use the current position estimate to determine the next position. This leads to discontiguous, irregular route prediction especially when the positioning accuracy is low, since it does not reflect the continuity of the position change according to the movement of the user. In contrast, a relative positioning scheme such as Pedestrian Dead Reckoning (PDR) determines the current position based on the previous position, reflecting the continuity of the position change but it cannot estimate the current position without the initial position. In this paper, we implement both FP and Inv-FP and evaluate their performance in small and large-scale testbeds. We analyze various characteristics of Inv-FP in comparison with the classical beacon based FP, and demonstrate that Inv-FP can match the performance of FP but with minimal power consumption on user devices. In addition, we propose a new localization algorithm that can combine Inv-FP with PDR. By integrating PDR with Inv-FP, we show that localization error can be reduced by reflecting the advantages of each method.
FAST SINGULAR BOUNDARY METHOD: MATHEMATICAL BACKGROUND AND APPLICATION IN WAVE PROPAGATION ANALYSIS

Despite active research of many decades, numerical solution of the large-scale exterior wave problems remains a great challenge. The finite element method (FEM) needs to be coupled with some effective special treatments for handling unbounded domains, which are often tricky and largely based on trial–error experiences. The boundary element method (BEM) appears attractive to exterior problems, because the fundamental solutions satisfy the governing equation and Sommerfeld radiation condition at infinity. However, the BEM encounters computationally expensive singular numerical integration of fundamental solutions. To avoid this troublesome issue, the method of fundamental solutions (MFS) distributes the source nodes on a fictitious boundary outside the physical domain and is meshless, integration-free, and highly accurate. However, the placement of fictitious boundary is still an open issue for complex-shaped boundary and multiply connected domain problems. Recently, an alternative meshless boundary collocation approach, singular boundary method (SBM), has been proposed to solve various wave propagation problems. The key issue of the SBM is to determine the accurate source intensity factors instead of the singularities of fundamental solutions at origin. Several techniques have been proposed and investigated. The SBM is mathematically simple, easy-to-program, meshless, and applies the concept of source intensity factors to eliminating the singularity of the fundamental solutions. The method avoids singular numerical integrals in the BEM and circumvents the troublesome placement of the fictitious boundary in the MFS. This paper first presents the mathematical background of the SBM, and then applies it to wave propagation analysis.
Target Signal Extraction Method Based on Enhanced ICA with Reference

Target signal extraction has a great potential for applications. To solve the problem of error extraction of target signals in the current constrained independent component analysis (cICA) method, an enhanced independent component analysis with reference (EICA-R) method is proposed. The new algorithm establishes a unified cost function, which combines the negative entropy contrast function and the distance metric function. The EICA-R method transforms the constrained optimization problem into unconstrained optimization problem to overcome the problem of threshold setting of distance metric function in constrained optimization problem. The theoretical analysis and simulation experiment show that the proposed EICA-R algorithm overcomes the problem of the error extraction of the existing algorithm and improves the reliability of the target signal extraction.
User Acceptance of Wireless Text Messaging in Telehealth: A Case for Adherence

This work is an investigation of user acceptance of a prototype solution utilizing wireless text messaging (or SMS i.e., short messaging service) to improve people's adherence. Insufficient adherence, also known as medical non-compliance, is a major cause of failure in self-management programs, causing significant losses to all healthcare stakeholders. Innovative mobile healthcare solutions, based on portable devices like cell phones, may address some non-adherence aspects by helping outpatients to follow treatments agreed with their health providers. Although this seems a win-win situation, a verdict on the overall usefulness of such an approach cannot be formulated before exploring outpatient acceptance, as this is a novel technology that targets a new area of implementation. Accordingly, this research investigates key factors that may influence the acceptance of a mobile healthcare solution based on SMS to support improved adherence to healthy behaviour, with special attention to motivation (the 'pro' factors) and perceived risk (the 'con' factors). As a means of investigation, a one-month longitudinal experiment with two groups of subjects (an intervention group and a control group) was utilized. Data were analyzed with quantitative and qualitative techniques: descriptive statistics, partial least squares modelling, and content analysis. Findings show that users are aware of the potential usefulness of such a pioneering application. However, enjoyment is the unique reason for adopting, and perceived financial and psychological risks the main obstacles against adopting, an SMSbased solution for improving adherence to healthy behaviour. Furthermore, a business analysis shows that users are concerned about usefulness features, even when asked about financial aspects. These results, together with encouraging findings about the effectiveness of the application, open the way for medical-led research to investigate if long-term mobile healthcare initiatives customized to patient needs are also beneficial for outpatient adherence and health outcomes.
AMPERE polar cap boundaries

Abstract. The high-latitude atmosphere is a dynamic region with processes that respond to forcing from the Sun, magnetosphere, neutral atmosphere, and ionosphere. Historically, the dominance of magnetosphere–ionosphere interactions has motivated upper atmospheric studies to use magnetic coordinates when examining magnetosphere–ionosphere–thermosphere coupling processes. However, there are significant differences between the dominant interactions within the polar cap, auroral oval, and equatorward of the auroral oval. Organising data relative to these boundaries has been shown to improve climatological and statistical studies, but the process of doing so is complicated by the shifting nature of the auroral oval and the difficulty in measuring its poleward and equatorward boundaries. This study presents a new set of open–closed magnetic field line boundaries (OCBs) obtained from Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) magnetic perturbation data. AMPERE observations of field-aligned currents (FACs) are used to determine the location of the boundary between the Region 1 (R1) and Region 2 (R2) FAC systems. This current boundary is thought to typically lie a few degrees equatorward of the OCB, making it a good candidate for obtaining OCB locations. The AMPERE R1–R2 boundaries are compared to the Defense Meteorological Satellite Program Special Sensor J (DMSP SSJ) electron energy flux boundaries to test this hypothesis and determine the best estimate of the systematic offset between the R1–R2 boundary and the OCB as a function of magnetic local time. These calibrated boundaries, as well as OCBs obtained from the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) observations, are validated using simultaneous observations of the convection reversal boundary measured by DMSP. The validation shows that the OCBs from IMAGE and AMPERE may be used together in statistical studies, providing the basis of a long-term data set that can be used to separate observations originating inside and outside of the polar cap.
Metamaterial inspired fidget spinner-shaped antenna based on parasitic split ring resonator for multi-standard wireless applications

This paper presents the design of fidget spinner-shaped antenna (FSSA) loaded with parasitic EC-SRR (edge coupled-split ring resonator) for multi-standard wireless applications. Parasitic EC-SRR element-loaded antenna helps to improve the impedance matching and bandwidth of antenna in comparison to the unloaded FSSA. The 50 Ω microstrip line fed has been applied to the structure of proposed antenna to obtain the distinct performance parameters such as reflection coefficient, gain, radiation pattern and efficiency. Comparison of the proposed antenna with and without SRR is made and found that the later case exhibits better results in terms of reflection coefficient and bandwidth. Bandwidth is increased by 21.61% at first two resonance points, 57.57% at third and 32.76% at fourth resonance point. A prototype of the proposed FSSA has also been fabricated and tested for validation of simulated results with measured results, and found in good agreement with each other. The overall dimensions of the proposed FSSA are 30 mm × 30 mm and can be used for different wireless applications in the frequency range 1.88–7.0 GHz, 7.81–8.85 GHz and 9.6–14.3 GHz.
Continuous Beam Scanning at a Fixed Frequency With a Composite Right-/Left-Handed Leaky-Wave Antenna Operating Over a Wide Frequency Band

Fixed-frequency beam scanning leaky-wave antennas (LWAs) that can scan their main beam over a specific frequency band are highly desired for future wireless communication systems. A composite right-/left-handed (CRLH) LWA is developed in this article that facilitates fixed-frequency continuous beam scanning over a wide operational frequency band. A variation of a simple single-layer nonreconfigurable frequency-based continuous beam scanning CRLH LWA is considered first. Its dispersion properties are approximately investigated using an equivalent circuit model. It is reported how two groups of varactor diodes can be incorporated into its basic circuit model to electronically control its dispersion behavior. An optimized reconfigurable CRLH LWA with practical dc biasing lines is then realized from this nonreconfigurable design. Fixed-frequency continuous beam scanning, from backward to forward directions through broadside, is reported over a wide operational frequency band. Simulations predict that the antenna can operate from 4.75 to 5.25 GHz with the main beam being continuously scannable at each frequency point. A prototype was fabricated, assembled, and tested. The measured results confirm its simulated performance characteristics.
A Comprehensive Review on Spectrum Management, Security and Energy-Efficient Cognitive Radio Networks

The explosive growth of mobile devices and the rapid increase in wireless services necessitate an improvement in communication techniques. This technology can boost spectrum utilization as well as meet the massive connectivity requirement to draw attention from academia and industry. Cognitive Radio Network (CRN) is an evident optimal solution in alleviating the challenges of spectrum unused potentially in wireless networks. The Secondary Users are allowed intelligently to access the sections of spectrum unused (spectrum holes) by the authorized Primary Users (PUs). The objective of this paper is to analyze channel throughput, delay, carrier aggregations, energy efficiency, and security challenges and provide research ideas to enhance the overall performance of the CRN. This review paper completely investigated the potential management of spectrum techniques, essentially in spectrum sensing, spectrum allocation, spectrum sharing, and spectrum handoff in CRN. In addition, we study the energy efficient routing techniques like network optimization frameworks in cooperative networks, protocols and different types of attack issues, approaches for handling the secure
A survey on the atomicity of Puiseux monoids

A Puiseux monoid is an additive submonoid of the nonnegative cone of $\mathbb{Q}$. Puiseux monoids exhibit, in general, a complex atomic structure. For instance, although various techniques have been developed in the past few years to identify subclasses of atomic Puiseux monoids, no characterization of atomic Puiseux monoids has been found so far. Here we survey some of the most relevant aspects of the atomicity of Puiseux monoids. The properties of being finitely generated, factorial, half-factorial, other-half-factorial, Prufer, Krull, seminormal, root-closed, and completely integrally closed can be all characterized in the context of Puiseux monoids, and we will provide such characterizations. In the same context, on the other hand, there are not known characterizations for the properties of being atomic, satisfying the ACCP, being a BF-monoid, or being an FF-monoid. However, we shall construct classes of Puiseux monoids satisfying each of the latter properties.
The Speed of Innovation Diffusion in Social Networks

New ways of doing things often get started through the actions of a few innovators, then diffuse rapidly as more and more people come into contact with prior adopters in their social network. Much of the literature focuses on the speed of diffusion as a function of the network topology. In practice, the topology may not be known with any precision, and it is constantly in flux as links are formed and severed. Here, we establish an upper bound on the expected waiting time until a given proportion of the population has adopted that holds independently of the network structure. Kreindler and Young (2014) demonstrated such a bound for regular networks when agents choose between two options: the innovation and the status quo. Our bound holds for directed and undirected networks of arbitrary size and degree distribution, and for multiple competing innovations with different payoffs.
Darboux Transformation for a Negative Order AKNS Equation

Using a quasideterminant Darboux matrix, we compute soliton solutions of a negative order AKNS (AKNS(−1)) equation. Darboux transformation (DT) is defined on the solutions to the Lax pair and the AKNS(−1) equation. By iterated DT to K-times, we obtain multisoliton solutions. It has been shown that multisoliton solutions can be expressed in terms of quasideterminants and shown to be related with the dressed solutions as obtained by dressing method.
CUR: Group Profiling with Community-based Users’ Representation

Group profiling methods aim to construct a descriptive profile for communities in social networks. Before the application of a profiling algorithm, it is necessary to collect and preprocess the users’ content information, i.e., to build a representation of each user in the network. Usually, existing group profiling strategies define the users’ representation by uniformly processing the entire content information in the network, and then, apply traditional feature selection methods over the user features in a group. However, such strategy may ignore specific characteristics of each group. This fact can lead to a limited representation for some communities, disregarding attributes which are relevant to the network perspective and describing more clearly a particular community despite the others. In this context, we propose the community-based user’s representation method (CUR). In this proposal, feature selection algorithms are applied over user features for each network community individually, aiming to assign relevant feature sets for each particular community. Such strategy will avoid the bias caused by larger communities on the overall user representation. Experiments were conducted in a co-authorship network to evaluate the CUR representation on different group profiling strategies and were assessed by hu- man evaluators. The results showed that profiles obtained after the application of the CUR module were better than the ones obtained by conventional users’ representation on an average of 76.54% of the evaluations.
Development of high spatial resolution acquisition methods for diffusion MRI. (Développements des méthodes d'acquisition à haute résolution spatiale en IRM de diffusion)

Diffusion MRI (dMRI) is the unique non-invasive technique that allows exploring the cerebral microstructure. Besides a wide use for medical applications, dMRI is also employed in neuroscience to understand the brain organization and connectivity. However, the low spatial resolution and the sensitivity to artefacts limit its application to non-human primates.This work aims to develop a new approach that allows to acquire dMRI at very high spatial resolution on anesthetized macaque brains. This method is based on a 3D sampling of Fourier space with a segmented Echo Planar imaging readout module. This method has been firstly implemented on a 3 Tesla MR scanner (Prisma, Siemens), validated and optimized in-vitro and in-vivo. Compared to the conventional acquisition method, a gain of sensitivity of 3 for the cerebral grey matter and of 4.7 for the white matter was obtained with the proposed approach.This method allowed us to acquire dMRI data on the macaque brain with a spatial isotropic resolution of 0.5 mm ever reached before. The interest to acquire dMRI data with such a spatial resolution to visualize and analyze in-vivo fine structures not detectable with the classical acquisition method, like the sub-fields of hippocampus and the superficial white matter, has also illustrated in this study. Finally, very encouraging preliminary results were also obtained in humans
Controlling the Photoelectric Effect in the Time Domain

When an atom or molecule absorbs a high-energy photon, an electron is emitted with a well-defined energy and a highly-symmetric angular distribution, ruled by energy quantization and parity conservation. These rules seemingly break down when small quantum systems are exposed to short and intense light pulses, which raise the question of their universality for the simplest case of the photoelectric effect. Here we investigate the photoionization of helium by a sequence of attosecond pulses in the presence of a weak infrared dressing field. We continuously control the energy and introduce an asymmetry in the emission direction of the photoelectrons, thus contradicting well established quantum-mechanical predictions. This control is possible due to an extreme temporal confinement of the light-matter interaction. Our work extends time-domain coherent control schemes to one of the fastest processes in nature, the photoelectric effect.
HANDHELD ELECTRONIC NOSE (HEN) FOR DETECTION OF OPTIMUM FERMENTATION TIME DURING TEA MANUFACTURE AND ASSESSMENT OF TEA QUALITY.

Both and affects the quality of tea. To understand the optimum and flavour of the processed tea, developed a held electronic nose system (HEN). The system consists of top, mid section. Top section contains major portion of electronics, array and section holds the valve and provides an air path between pump and sample holder and between sample holder and sensor array. bottom section is a threaded glass jar that acts sample holder. fermentation bed at an interval of five minutes and the generated aroma volatiles were discharged to the sensor array. The captured aroma was plotted against time to get the second aroma peak, which determined the optimum end point of fermentation. This was compared with the existing chemical method. The results obtained through HEN were correlated with the existing chemical method. The processed teas consisting CTC and orthodox types of manufacture and different grades were evaluated through HEN and the results were compared with organoleptic evaluation of tea by national and international tea tasters. The results revealed that the Handheld Electronic Nose is a suitable instrument for determining the optimum fermentation time during tea manufacture based on aroma.
TT¯
 deformations as 
TsT
 transformations

The relationship between $T\bar{T}$ deformations and the uniform light-cone gauge, first noted in arXiv:1804.01998, provides a powerful generating technique for deformed models. We recall this construction, distinguishing between changes of the gauge frame, which do not affect the theory, and genuine deformations. We investigate the geometric interpretation of the latter and argue that they affect the global features of the geometry before gauge fixing. Exploiting a formal relation between uniform light-cone gauge and static gauge in a T-dual frame, we interpret such a change as a TsT transformation involving the two light-cone coordinates. In the static-gauge picture, the $T\bar{T}$ CDD factor then has a natural interpretation as a Drinfel'd-Reshetikhin twist of the worldsheet S matrix. To illustrate these ideas, we find the geometries yielding a $T\bar{T}$ deformation of the worldsheet S matrix of pp-wave and Lin-Lunin-Maldacena backgrounds.
PERANCANGAN DAN ANALISA SISTEM KENDALI FREKUENSI SISTEM TENAGA LISTRIK DENGAN METODE PENEMPATAN KUTUB

This study discusses the application of Polar Placement method using Bass - Gura algorithm on Non - Reheat type frequency electric control system with emphasis on frequency deviation on power system. The performance indicators of electric power system that can be calculated and observed include error analysis, response speed, response quality, frequency domain analysis, stability analysis and robustness analysis of the frequency deviation response of electric power system. The simulation results show that the non-reheat type deviation of electric power with Polar Placement method shows better result compared to non-reheat type frequency power deviation response without the Polar Placement method with a steady state error value of 0.0041, the rise time value of 0.0562 second, the peak time value is 0.0049 seconds, the time value of the steady state is 0.5113 seconds, the maximum pass value is 19.2112%, the root of the characteristic equation which all the parts are negative, the maximum peak value is 1.0049 and the maximum peak value of complementary sensitivity is 0.0051. Keywords: Frequency Deviation, Polar Placement, Bass - Gura Algorithm, Non – Reheat