Miracle-dz/UniFAR-FTUs huggingface dataset:
WHATSAPPENING OUTSIDE YOUR LMS? ANALYZING A SOCIAL MEDIA INSTANT MESSAGING POWERED LEARNING COMMUNITY

The use of Social Media applications in educational settings has gained attention ever since educators became aware of their growing role in student’s daily routine. These arise as privileged tools for social interactions, information exchange, collaborative knowledge building, immediate communication and persistent attention retaining, among others. Consequently, these tools impose themselves as complements to the profoundly established use of the traditional LMS, either being propelled by educators or requested by students. In previous research, we have already identified Facebook groups as one of the social media applications with the highest potential to foster the development of social learning communities. We have acknowledged the need to integrate Facebook groups and corresponding learning analytics into formal learning environments, such as the institutional LMS, and we have developed and presented a system which performs that integration. However, as the educational settings diversify in terms of pedagogy, coursework and student’s profile and cultural background, we have identified the need to extend this integration to other social media tools, such as the instant messaging app WhatsApp, and to provide valuable learning analytics on its usage. Mobile, instant messaging based learning communities differ a lot from forum-alike communities, where threads, topics, conversations and interactions are easily trackable and, for instance, social network analysis can be conducted to profile members, roles and relationships. Therefore, research presented in this paper adds to previous consolidated work both on the technological and analytical dimensions. We address the challenges posed by the integration of WhatsApp based learning analytics in the LMS Moodle, starting by the fact that, unlike Facebook groups, WhatsApp does not provide an API for developers, nor any stream of structured data that can feed a real-time monitoring system. We then focus research on revealing an actual set of visual learning analytics that characterize a learning community of about thirty foreign master students, who used WhatsApp as a complementary tool during a semester. We discuss which type of learning analytics and corresponding visualizations best suit WhatsApp learning communities; what can educators draw from the analytics of such communities; and how that information can strengthen student assessment and profiling.
Web retrieval, ranking and personalization

Most books on information-seeking neglect the human side to focus solely on the technical aspects of retrieval systems. This book is the first to provide an information science perspective on information retrieval, with a focus on user behavior and needs. Beginning with the history of information retrieval, coverage goes on to consider behavioral models and interactive techniques as well as the design, implementation and evaluation of information retrieval interfaces. This comprehensive book will be the go-to for LIS students and professionals hoping to better appreciate and utilize information retrieval systems, theories, and practices. Contents Interactive information retrieval : history and background / Colleen Cool and Nicholas J. Belkin Information behavior and seeking / Peiling Wang Task-based information searching and retrieval / Elaine G. Toms Approaches to investigating information interaction and behaviour / Raya Fidel Information representation / Mark D. Smucker Access models / Edie Rasmussen Evaluation / Kalervo Jarvelin Interfaces for information retrieval / Max Wilson Interactive techniques / Ryen W. White Web retrieval, ranking and personalization / Jaime Teevan and Susan Dumais Recommendation, collaboration and social search / David M. Nichols and Michael B. Twidale Multimedia : behaviour, interfaces and interaction / Haiming Liu, Suzanne Little and Stefan Ruger Multimedia : information representation and access / Suzanne Little, Evan Brown and Stefan Ruger
A new and efficient authentication scheme for vehicular ad hoc networks

Abstract In the past decades, Vehicular Ad hoc Networks (VANETs) have been increasingly developed. Providing secure and efficient communication is essential in VANETs. One of most important challenges in the secure and efficient communications is proposing an appropriate authentication scheme. In this paper, we suggest an efficient and novel authentication scheme for VANETs. In the proposed scheme, vehicles authenticate each other without any limitation such as need for group of signers, online Road Side Units (RSUs), a set of pseudo identities and tamper-proof devices. Moreover, our simulation shows that the proposed scheme is well designed and efficient.
PENENTUAN KLASIFIKASI STATE PADA RANTAI MARKOV DENGAN MENGGUNAKAN NILAI EIGEN DARI MATRIKS PELUANG TRANSISI

Masalah dasar dari pemodelan stokastik dengan proses Markov adalah menentukan deskripsi state yang sesuai, sehingga proses stokastik yang berpadanan akan benar-benar memiliki sifat Markov, yaitu pengetahuan terhadap state saat ini adalah cukup untuk memprediksi perilaku stokastik dari proses di waktu yang akan datang. Penelitian ini dilakukan untuk menentukan klasifikasi state pada rantai Markov yang dibatasi untuk n = 4. Hasil penelitian ini menunjukkan bahwa untuk, state 4 terdapat satu state absorbing dan tiga state transient. Untuk batasan nilai terdapat dua state yang transient, dua state yang recurrent, dan membentuk satu kelas ekivalensi, sedangkan untuk batasan nilai terdapat dua state yang transient, dua state yang recurrent, dan termasuk state yang recurrent dalam satu kelas ekivalensi. DETERMINE CLASSIFICATION OF STATE IN MARKOV CHAIN USING EIGEN VALUE FROM TRANTITION PROBABILITY MATRIX ABSTRACT Base problem from stochastic modal with Markov process is to determine appropriate state of description, in order that stochastic process corresponding will has truly Markov’s characteristic. Recently, it is adequate for knowledge of state to predict process of behavior stochastic in future. The research is intended to determine classification of state in Markov’s chain that is restriction to 4. The results indicate that for state,for 4. A restriction value will be formed one state transient, two states recurrent and one class of equivalent, while limited one will be formed two states transient, two states recurrent, and including one state recurrent inside one class of equivalent.
Enhanced Detection of Doppler-Spread Targets for FMCW Radar

Frequency-modulated continuous waveform signals are of great interest in automotive radar, perimeter radar, and wide-area surveillance radar applications. For automotive radars and wide-area surveillance radars, which generally utilize high Doppler frequency resolution for target recognition, the important potential target such as a walking person cannot be viewed as a point-like target due to different velocities of the reflection points of a pedestrian. The echoes of such targets have extended Doppler spectrum, and they appear as horizontal lines in the range-Doppler plane, rather than a single point considered in the traditional cases. However, the existing approaches do not make full use of the Doppler-spread characteristic to enhance the detection performance of pedestrians. In this paper, we will show how this characteristic can be used to enhance the detection performance for Doppler-spread targets. The main goal of this paper is pedestrian detection in wide-surveillance radar applications and the proposed approach can also be applied in automotive radar applications. Motivated by the Hough transform, the energies of most Doppler bins corresponding to the target will be accumulated to enhance the detection performance. The questions of how many and which cells should be accumulated in practical applications are discussed in detail. The proposed approach is based on the ordered statistical-constant false alarm rate but tailored to Doppler-spread targets. The detection performance of this algorithm is derived analytically, and verified via practical wide-area surveillance radar signals.
The Organizational Design of the Project-Based Organization

This article investigates organizational design choices and their antecedents for the design of project-based organizations. Extant literature acknowledges the diversity of project-based organizational forms, but neither the particular configurations of organizational design dimensions nor the reasons behind their differences are widely addressed. Based on interviews in 12 project-based organizations in various sectors, this study identifies three common organizational design configurations of project-based organizations. It further discusses a range of internal and external factors, which can influence the choice of configuration. The findings are summarized in five overriding conclusions.
A proposed single-stage single-phase full bridge boost inverter

ABSTRACT A proposed topology for a high-efficiency single-stage single-Phase boost inverter with a simple circuit configuration and a low component count is proposed in this paper. The proposed inverter produces instantaneous output voltages higher than the input dc voltage without an intermediate power conversion stage. A new control scheme is designed that enables the proposed inverter topology to produce a low distortion sinusoidal output waveforms and provide good load voltage regulation. The inverter circuit topology and modes of operations are fully described and simulated using Matlab/Simulink. The simulation results are presented illustrating the claimed boosting characteristics, sinusoidal output wave forms and good load regulation capability of the proposed inverter. The validity and effectiveness of the proposed inverter are verified experimentally by building a laboratory model using the digital signal processor (Model DS1104). The experimental results are presented confirming the claimed features of the inverter.
A finite element framework for a shape memory alloy actuated finger

This article presents on finite element modeling of an artificial finger driven by shape memory alloy wires. These alloys appear as a promising transduction technology, due to their inherently high energy density which makes them a good choice for compact, lightweight, and silent actuator systems with many applications in the robotic field, ranging from industrial to biomedical ones. However, the complex nonlinear and hysteretic behavior of the material makes it difficult to accurately model and design shape memory alloy–actuated systems. The problem is even more challenging when shape memory alloys are used as actuators in articulated structures, adding complex kinematics and contact situations to the picture. In this article, a finite element model is developed to describe the behavior of a finger prototype, in which a bundle of shape memory alloy wires works against an extension spring. The commercially available software COMSOL is used for implementing the coupling and contact issues between the finger structure and the shape memory alloy wires. To describe the shape memory alloy material behavior, a COMSOL implementation of the Müller–Achenbach–Seelecke model is presented. By means of different experiments, it is demonstrated how the model predicts the prototype behavior in relation to different power stimuli and actuator geometries.
Design of an induction machine with damper windings for noise and vibrations reduction

Purpose The purpose of this paper is to present a design method for induction machines including a three-phase damper winding for noise and vibrations reduction. Design/methodology/approach In the first part, the principle of the damper winding is recalled. The second part presents the iterative design method which is applied on a 4-kW pulse width modulation (PWM)-fed induction machine to study the impact of the additional winding on the geometry. In the third part, the finite-element method is used to validate the designed geometry and highlight the harmonic flux density reduction. Finally, some experimental results are given. Findings The study shows that the impact of the additional three-phase winding on the geometry and weight of the machine is low. Moreover, the proposed noise reduction method allows one to reduce the total noise level of a PWM-fed induction machine up to 8.5 dBA. Originality/value The originality of the paper concerns the design and characterization of a three-phase damper winding for a noiseless induction machine. The principle of this proposed noise reduction method is new and has been patented.
Handbook of 3D Integration

3D IC is just one of a host of 3D integration schemes that exploit the z-direction Philip Garrou, Christopher Bower, Peter Ramm: Handbook of 3D Integration. Peter Ramm, Fraunhofer EMFT, defines heterogenous 3D integration as 3D for 3D Integration and Interposer Technologies”, Handbook of 3D Integration, Vol. Desktop 3D printing giant MakerBot has published a handbook designed to to support the integration of 3D printing in the classroom though challenges.
Experimental and Analytical Seismic Studies of a Two-Span Bridge System with Precast Concrete Elements and ABC Connections

Accelerated bridge construction (ABC) expedites on-site construction by integrating prefabricated elements that could be built in parallel and assembled in place using ABC connections during site preparation. As a result, ABC has become an attractive alternative to the conventional cast-in-place (CIP) construction methods in several states and countries to better serve the travelling public. However, the lack of data on the seismic performance of bridges that incorporate precast elements and ABC connections has hindered and limited their application in high seismic regions. This gap was addressed in this investigation by designing, building, and testing under simulated ground motions a 0.35-scale, two-span ABC bridge model. The study is funded by the California Department of Transportation (Caltrans) and comprised experimental and analytical investigations to assess the seismic performance of the bridge system and ABC connections under bi-directional horizontal ground motions, determine the adequacy of existing design methods for the ABC connections and propose necessary refinements to account for interaction of elements and connections in a bridge and bi-axial earthquake loading effect, determine the applicability of existing analytical tools to model ABC bridges and connections and formulate necessary improvements, and investigate potential effects on the bridge system and connections of parameters that were not included in the tests. Precast reinforced and prestressed concrete elements built with conventional concrete and steel were integrated into the bridge model and were connected using six ABC connection types: (1) column-to-footing connection, (2) column-to-cap beam connection, (3) girder-to-cap beam connection, (4) connection of deck panels from one span to the next at the pier, (5) deck-to-girder connection, and (6) connection between
Effectiveness of Field Water Tube for Standardization of Alternate Wetting and Drying (AWD) Method of Water Management in Lowland Rice (Oryza Sativa L.)

A field study was conducted to discover the effectiveness of a field water tube as a practical indicator for water management in lowland rice (Oryza sativa L.). The field water tube was of 40 cm length and 15 cm in diameter so that the groundwater table could be easily visible. This tube with perforations was inserted into the ground until 20 cm protruded above soil level. It enabled monitoring of the water level inside the tube as and when the ponded water level drops to a certain permissible level, i.e. 5–15 cm‐surface. Practical indicators used in the experiment to find out the effectiveness of the field water tube were water stress parameters, viz. soil penetration resistance, soil crack width, soil siltation depth and days needed for ponded water to drop to a designated level in the field water tube. Field trials revealed that with 5 cm submergence depth and a threshold of 5 or 10 cm water depth below the ground level in the field the water tube was found to be a safe alternate wetting and drying practice in view of the higher yield (7060–7210 kg ha−1), considerable water saving (26.6–35.0%) and higher water productivity (1.15–1.27 kg m−3). © 2019 John Wiley & Sons, Ltd.
Investigation of Ring Touch Mode Capacitive Pressure Sensor With an Electrothermomechanical Coupling Contact Model

Ring touch mode capacitive pressure sensor, characterized by ring stopper and stepped circular diaphragm, is developed to eliminate or greatly alleviate some disadvantages existing in conventional or small-area touch mode capacitive pressure sensor. An electrothermomechanical coupling model is developed to calculate the deformation, stress and so on of the diaphragm, and it is universally available for different touch modes and non-touch mode. The model is with rapid calculation speed and it is verified by a combination of the finite element method (FEM) and boundary element method (BEM). Benefiting from the high calculation speed of the model, optimization designs of the sensor are carried out. By adjusting the height dimensions or radial dimensions, high sensitivity and strength can be achieved by such a sensor in different pressure ranges of interest without changing its planar package size and masks, or achieved in a very wide pressure range by an array composed of such sensors with a same set of process parameters of each sensor. On the other hand, optimal ratios of height dimensions or radial dimensions are acquired, which can suppress significantly the temperature’s influence on sensor operation, and furthermore, the optimal ratios are advisable for different pressure ranges and different material parameters of the sensor.
A Comparative Study on Interactions of Antimicrobial Peptides L- and D-phenylseptin with 1,2-dimyristoyl-sn-glycero-3-phosphocholine

L-phenylseptin (L-Phes) and D-phenylseptin (D-Phes) are amphibian antimicrobial peptides isolated from the skin secretion of Hypsiboas punctatus. In the N-termini, L-Phes and D-Phes contain three consecutive phenylalanine residues, l-Phe-l-Phe-l-Phe and l-Phe-d-Phe-l-Phe, respectively. They are known to exhibit antimicrobial activity against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Xanthomonas axonopodis pv. Glycines. However, their mechanism of action and the role of the D-amino acid residue have not been elucidated yet. In this study, the interactions of both peptides with 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) were investigated by means of quartz crystal microbalance, circular dichroism, vibrational circular dichroism, 31P solid-state NMR, and molecular dynamics simulation. Both peptides have similar binding constants to the DMPC lipid bilayers, in the order of 106 M−1, and form an α-helix structure in the DMPC lipid bilayers. Both the peptides induce similar changes in the dynamics of DMPC lipids. Thus, in spite of the difference in the conformations caused by the chirality at the N-terminus, the peptides showed similar behavior in the membrane-bound state, experimentally and computationally.
Magnetic Properties of L1 0 FeNi Phase Developed Through Annealing of an Amorphous Alloy

Chemically ordered L10 FeNi phase observed in Fe-based meteorite has the potential to replace high-cost rare-earth-based permanent magnets in the future. However, artificial production of this phase is extremely difficult due to negligible atomic diffusion around order–disorder transition temperature (~320 °C). Here, we report a method for producing high-quality L10 FeNi phase and its magnetic properties. We show that a highly disordered metastable state, that is, amorphous can be utilized to produce a highly ordered state, which is not possible with the conventional processing techniques. Amorphous Fe42Ni41.3Si x B12− x P4Cu0.7 ( $x=0$ to 8 at.%) alloy ribbons were studied. Crystallization of amorphous ribbons at 400 °C results in adequate atomic diffusion at low temperatures to precipitate L10 FeNi grains. Structural characterization revealed a high degree of chemical ordering ( $S \ge 0.8$ ), but the volume fraction of precipitated L10 grains is low. The crystallized ribbons of FeSiBPCu are composed of two magnetic phases (hard magnetic L10 FeNi grains embedded in a soft magnetic matrix). Alloys with higher concentration of Si are shown to produce high coercivity ( $H_{c}\sim 700$ –750 Oe). The soft magnetic matrix strongly influences the H c . The actual switching field (≥3.7 kOe) of L10 FeNi has been found to be much higher than that of H c . In this paper, the L10 FeNi phase is shown to form at temperatures higher than the reported order–disorder temperature. Our results of temperature-dependent magnetization and thermal analyses suggest that the L10 FeNi phase can survive at temperatures ≤550 °C. The magnetization reversal mechanism was understood by angular dependence of $H_{c}$ , and it is shown to be a domain-wall pinning type. Due to structural and magnetic similarities between L10 FeNi and L10 FePt, ribbon samples with low-volume fraction of L10 FePt grains in a soft magnetic matrix were prepared with a similar technique. Magnetization behavior of L10 FeNi is shown to be similar to that of L10 FePt.
Identification of Prospective Surface Water Available Zones with Multi Criteria Decision Approach in Kushkarani River Basin of Eastern India

Present paper mainly intends to find out suitable sites for surface water harvesting in Kushkarani river basin a tributary of Mayurakshi river of Eastern India. For this multiparametric potential surface water availability model and SCS CN based runoff depth models have been prepared in soft ware environments. Both unweighted and weighted linear combination methods are used for compositing the selected parameters. Results show that 14.18% of a total basin area (172 sq. km.) characterised by very high surface water potential is mainly concentrated in the confluence segment of the river followed by high potential zone covering 22.47% area. Unweighted composting model based estimation shows that very high and high surface water potential zone cover 8.22% and 21.95% of basin area, but areal extent in these two classes is little bit lower than the results obtained from weighted composting model. Field based discharge measurement validates the surface water potential zones. Similarly, Discharge availability in the rivers of different Original Research Article Khatun and Pal; ACRI, 4(4): 1-20, 2016; Article no. ACRI.27651 2 potential zones are also indicating very accordant result and validating the surface water runoff models. SCS CN based runoff depth model represents that 9.32% area covers very high runoff depth (657 mm. to 693 mm). Calculated Relative error value and Nash-Sutcliffe efficiency values are respectively 53.65% and 0. 6782 which represent that runoff model is not highly optimum but it is within the range of acceptability. Correlation coefficient value between monsoon runoff depth and surface water potentiality (r=0.6453) is high and it is significant at 0.01 level of significance which does indicate both the models are highlighting result in same direction. For validating these models with field based discharge data, it is noticed that discharge data strongly controls surface water availability (R=0.962) and runoff depth (R=0.970). From the models it is proved that specifically, confluence segment and very proximate riparian low land of the rivers is selected as suitable sites for surface water harvesting.