Miracle-dz/UniFAR-FTUs huggingface dataset:
Analysis of technology integration in teacher education in Ghana: A case study of St. Teresa’s college of education, Hohoe, Ghana

The study sought to investigate technology use among teachers and students of St. Teresa’s College of Education to uncover factors influencing their technology use. Investigating technology use in teaching and learning was crucial because this knowledge could provide guidance for ways to enhance technology integration and encourage greater use of technology in teaching and learning. Besides, the study also investigated the factors that influence teachers and students’ technology use and suggested effective ways of integrating technology in St. Teresa’s College of Education. A cross-sectional survey design with mixed (quantitative and qualitative) methodology was used for the study. The population of the study comprised all teachers and Diploma in Basic Education (DBE) 1 and 2 students of St. Teresa’s College of Education. A stratified sampling method was used to select 40 teachers and 200 students. The study revealed that the extent to which St. Teresa’s College of Education teachers and students use technology in teaching and learning was very low. The analysis revealed that the differences in the mean technology use between male and female teachers and self-perceived efficacy in technology use were statistically significant. Besides, students having access to high technology resources used more technology than those having low technology resources. The findings further revealed that the differences in the mean technology use between students with different ages and availability of technology resources were statistically significant. Evidence from the research suggests that the challenges of ICT use in education do not lie only in the lack of availability of technological resources, but also in the shortage of skilled human resources and other institutional factors. Implications that relate to teacher “readiness” to deliver 21st century education through the use of technology was discussed and analyzed. The study recommended that, the Curriculum Research Development Division (CRDD) of the Ghana Education Service in collaboration with the related agencies in the Ministry of Education should carry out research to review critically the curriculum and revise the existing course outlines to explicitly state what ICT tools must be used and how it should be used in the teaching and learning process. It is further recommended that, the Ministry of Education and for that matter the government of Ghana should endeavour to equip all colleges in the country with well-furnished computer laboratories to enable both the teachers and students to get high access to technology resources. The colleges of education must be provided and trained in software that will equip and help in imparting knowledge after their completion.
Transient Analysis of Electromagnetic Scattering by Penetrable Objects Based on Time-Domain PMCHWT Equations

Transient analysis of electromagnetic (EM) scattering by penetrable objects is formulated by time-domain Poggio-Miller-Chang-Harrington-Wu-Tsai (TD-PMCHWT) equations. Traditionally, the equations are solved by discretizing the space domain with the method of moments (MoM) and discretizing the time domain with a march-on-in-time (MoT) scheme. The MoM may be very inconvenient in the time-domain environment and the MoT scheme will give rise to a late-time instability. We propose a different approach to solve the TD-PMCHWT equations by incorporating the Nyström method of discretizing the space domain and Galerkin’s scheme with Laguerre function for discretizing the time domain. The approach can overcome the drawbacks of traditional approach and a numerical example is provided to demonstrate its performance.
mmWave Double Cavity-Backed Slot Antenna featuring Electrically Small and Low-Profile

This paper describes a mmWave double cavity-backed slot antenna (CBSA) for mmWave frequencies. The proposed antenna achieves dual resonance at 28GHz and 38GHz. The finalized 1 × 4 antenna array features 5.64 dBi and 8.84 dBi gain at 28GHz and 38GHz, respectively.
Quadrotor Modeling and Simulation for Industrial Application

This paper presents a modeling and simulation of quadrotor helicopter in outdoor environment. The purpose of the developed simulation environment is to provide a tool for evaluation of quadrotor systems under development and/or manufacturing. Such tool allows to perform parameter tunung and flight verification under simulation before evaluation of the rotorcraft in real working conditions. The model adopted in the presented simulation environment is similar to the model used in the flight controller and allows direct usage of the control parameters adjusted under simulation. Several experimental examples prove the capabilities and usability of the proposed simulation environment.
Negative Impedance Converter with reduced real part of input impedance

The non-Foster matching using negative impedance converters (NICs) circuit enhances the available bandwidth of small antennas due to their non-Foster behavior of reactance. However, since a NIC is connected in series between the antenna and the power source, it is necessary to reduce the real part of input impedance of NIC not to consume the input power. In this research, we reduced the real part of input impedance of NIC using an operational amplifier (op-amp) and improved stability.
Tectonic structure , evolution , and the nature of oceanic core complexes and their detachment fault zones ( 13 degrees 20 ’ N and 13 degrees 30 ’ N , Mid Atlantic Ridge )

Microbathymetry data, in situ observations, and sampling along the 138200N and 138200N oceanic core complexes (OCCs) reveal mechanisms of detachment fault denudation at the seafloor, links between tectonic extension and mass wasting, and expose the nature of corrugations, ubiquitous at OCCs. In the initial stages of detachment faulting and high-angle fault, scarps show extensive mass wasting that reduces their slope. Flexural rotation further lowers scarp slope, hinders mass wasting, resulting in morphologically complex chaotic terrain between the breakaway and the denuded corrugated surface. Extension and drag along the fault plane uplifts a wedge of hangingwall material (apron). The detachment surface emerges along a continuous moat that sheds rocks and covers it with unconsolidated rubble, while local slumping emplaces rubble ridges overlying corrugations. The detachment fault zone is a set of anostomosed slip planes, elongated in the alongextension direction. Slip planes bind fault rock bodies defining the corrugations observed in microbathymetry and sonar. Fault planes with extension-parallel stria are exposed along corrugation flanks, where the rubble cover is shed. Detachment fault rocks are primarily basalt fault breccia at 138200N OCC, and gabbro and peridotite at 138300N, demonstrating that brittle strain localization in shallow lithosphere form corrugations, regardless of lithologies in the detachment zone. Finally, faulting and volcanism dismember the 138300N OCC, with widespread present and past hydrothermal activity (Semenov fields), while the Irinovskoe hydrothermal field at the 138200N core complex suggests a magmatic source within the footwall. These results confirm the ubiquitous relationship between hydrothermal activity and oceanic detachment formation and evolution. Plain Language Summary Oceanic detachments are long-lived faults that are exposed at the seafloor, often showing prominent corrugations. Detailed mapping and inset observations and sampling, using remotely operated and autonomous robots, demonstrate as these fault surfaces are exposed at the seafloor, erosion and deposition of debris cover these faults systematically with a thin layer of rubble, demonstrating that their evolutions intimately linked to surface processes. Locally, the fault itself is exposed, displaying striated fault planes on the flanks of corrugations. A complex, three-dimensional network of fault planes within the detachment zone defines elongated bodies of rock (corrugations). These detachments also confirm that there is a direct link between detachment formation and hydrothermal activity, as they host both active and inactive hydrothermal fields.
Ethereum Blockchain for Securing the Internet of Things: Practical Implementation and Performance Evaluation

Blockchain technology is a distributed database ‘distributed ledger’ and offers features such as autonomy, decentralisation and a trustless environment. These features make blockchain suitable to be applied to different applications within the Internet of Things (IoT) realm. This paper provides a practical implementation of Proof of Authority (PoA) Ethereum blockchain on an IoT system in a real-world use case. This implementation was practically accomplished in order to investigate and highlight some of the possible issues that could affect the integration of blockchain with IoT, to lay the ground for future research and possible solutions to these issues.
Text-based indicators for architectural inventions derived from patent documents: the case of Apple’s iPad

Nowadays companies are endangered not only from radical breakthrough innovations that disrupt the market and company knowledge, but also from architectural innovations, which recombine different existing technologies in a new way. There are already studies exploring the power of patent documents in finding indicators for potential architectural innovations. However, additional research on these indicators is needed. This thesis aims to further develop indicators for the architectural nature of technical inventions. It aims at building new theory, using a longitudinal embedded single case study as a research design. It focuses on Apple’s iPad as an object of analysis due to its extreme impact on the mobile computers industry. This thesis proposes a new method for identification of the architectural nature of a patent using text-based indicators in form of keywords. The method is validated through an expert opinion, but it also shows low congruence. Nevertheless, results show potential despite the discrepancy between the keywords and the expert opinion approaches and further development seems plausible.
Reconstruction of Anisotropic Dielectric Objects Based on Integral Equation Method

Anisotropic dielectric objects are reconstructed by an integral equation method. Since the objects are anisotropic and imaging domain is inhomogeneous, volume integral equations (VIEs) must be employed to describe the problem. Traditionally, the VIEs are solved by the method of moments (MoM) with the Schaubert-Wilton-Glisson (SWG) basis function in the forward scattering VIEs (FSVIEs). We use a Nyström method to solve the FSVIEs and it may be more suitable than the MoM due to the anisotropy. For the inverse scattering VIEs (ISVIEs), we use a Gauss-Newton method (GNM) to solve it. A numerical example is presented to illustrate the approach and its good performance has been validated.
Cooperative Advertising Models in O2O Supply Chains with Fairness Concerns

The Media Resource Replacement Plans (MRRPs) of the online retail platforms have been widely used as a more advanced cooperative advertising strategy nowadays. MRRPs means that the manufacturer embodies the brand visual elements of the online platform in her national advertising, and the online retail platform shares the corresponding advertising cost with the manufacturer. In this paper, we consider an O2O supply chain consisting of an online retail platform and a manufacturer with fairness concerns. We consider cooperative advertising strategies for this O2O supply chain and investigate three game-theoretical models, namely, N-Model, CN-Model, and CF-Model. We derive the optimal decisions of advertising efforts and participation rates between the supply chain members, and explore how they are linked to the interrelationship between the O2O channels and other system parameters. Applying the equilibrium analysis, we find that only when the cross-selling effect of online channels reaches a certain level, manufacturers are eligible to participate in the MRRPs of online retail platforms, Participating in MRRPs can increase the profits of O2O supply chain members(both manufacturer and online retail platform). We also discuss the impact of manufacturers' fairness concerns on O2O supply chain cooperative advertising strategies.
Implicit Theories: Elaboration and Extension of the Model

We found these commentaries to be deeply thoughtful and thought-provoking. Not only were we led down new paths, but we were also led to reexplore the old ones. In addition, it was gratifying to see that many of the most common questions were ones that we have addressed in our latest research. Thus we are able to present new data that speak to a number of issues, including stereotyping, cross-cultural differences, and the origins of implicit theories in early childhood. We begin with issues relating to the model and its constructs, and then we go on to consider generalization of the model to new areas.
Design of a Compact High-Gain Slotted Trapezoidal Antenna at 2.45 GHz For Energy Harvesting

In this paper, a compact, high gain, simple design, and high efficient single layer slotted dipole antenna is presented. The proposed antenna is fabricated on a low-cost commercial FR4 substrate and is suitable for RF energy harvesting applications. The antenna design relying on a simple modified trapezoidal dipole antenna patterned with a rectangular slot to minimize the inductive loading on the input impedance. A four-arms of a trapezoidal structure are arranged on a half-circle configuration. The performance of the antenna is studied using the simulation and experimental measurements. The antenna offers the main lobe in the z-plane direction with more than 6.5 dBi gain. The input reflection coefficient is measured at 2.45 GHz with a bandwidth extending from 2.4 to 2.5 GHz. The antenna has a small footprint and its dimensions are 32 × 34 mm2.
A Triple-band Millimeter Wave SIW Antenna with Dual-Sense Circular Polarization

A single-feed single-layer triple-band substrate integrated waveguide (SIW) antenna operating in millimeter wave (mmWave) band with dual-sense circular polarization is presented. The polarization states at three bands are right-hand circular polarization(RHCP), vertical polarization and left-hand circular polarization(LHCP) respectively. The proposed antenna consists of circular patch radiator, annular-ring slot radiator and SIW transmission line. The lower band (28 GHz) and middle band (33 GHz) are generated by the circular patch that at the center of the antenna. The annular-ring slot radiator generats upper band (38 GHz). The proposed antenna has characteristics of low-profile and simple structure.
Determinants of Student Performance in International Trade Course

Using the probit model, this paper seeks to identify factors that influence student learning in college international trade course at a Thailand university. The study used 79 students completing questionnaire. Male students outperform their female counterpart. High parental income family has positive effect. Average-GPA students do better in class. The probability of high performance among students who feel comfortable commuting to campus was higher than students who feel uncomfortable. Students who graduated from public-high school did better in class. Surprisingly the probability of high performance was significantly lower for students who feel campus clean. Measure of attitude towards school having a good facility did have a significant impact on the likelihood to do better in class. Students who felt this class was fun and who have good attitude towards instructor were much more likely to do better in class. Personal tutor and perfect attendance has a positive effect.
Model Smoothing Using Virtual Adversarial Training for Speech Emotion Estimation

Emotion estimation by speech increase precision through the development of deep learning. However, most of the emotion estimation using deep learning involves supervised learning, and it is difficult to get a large data set used for learning. In addition, when the training data environment and the actual data environment are significantly different, it is considered as a problem that the accuracy of emotion estimation greatly deteriorates. Therefore, in this study, in order to solves these problems, we used a smooth emotion estimation model by using virtual adversarial training (VAT), which is a semi supervised learning method, that improves the robustness of the model. VAT attracts attention in machine learning as a method of smoothing a generation model by adding minute and intentional perturbation to training data in learning. We first set hyperparameters in VAT by verification with single corpus and then perform evaluation experiments with cross corpus to show the improvement of model robustness.
Hemodynamics in Ruptured Intracranial Aneurysms

Incidental detection of unruptured intracranial aneurysms (UIA) has increased in the recent years. There is a need in the clinical community to identify those that are prone to rupture and would require preventive treatment. Hemodynamics in cerebral blood vessels plays a key role in the lifetime cycle of intracranial aneurysms (IA). Understanding their initiation, growth, and rupture or stabilization may identify those hemodynamic features that lead to aneurysm instability and rupture. Modeling hemodynamics using computational fluid dynamics (CFD) could aid in understanding the processes in the development of IA. The neurosurgical approach during operation of IA allows direct visualization of the aneurysm sac and its sam-pling in many cases. Detailed analysis of the quality of the aneurysm wall under the microscope, together with histological assessment of the aneurysm wall and CFD modeling, can help in building complex knowledge on the relationship between the biology of the wall and hemodynamics. Detailed CFD analysis of the rupture point can further strengthen the association between hemodynamics and rupture. In this chapter we summarize current knowledge on CFD and intracranial aneurysms.
The Impact of Confucius Institute on Chinese Enterprises' Overseas M&A

Using the data on China's overseas merger and acquisition (M&A) in 135 countries which establish Confucius Institute from 2009 to 2016, this paper investigates the impact of Confucius Institute on Chinese enterprises' overseas M&A. First, our findings indicate that the cultural output of Confucius Institute facilitates China's overseas M&A. Generally, the more established Confucius Institutes a country has, the more frequently Chinese enterprises conduct overseas M&A in that country. Besides, the paper shows that Confucius Institute has a stronger role in facilitating overseas M&A in countries that are longer geographically distant. Finally, the results reveal that Confucius Institute' impact is more pronounced in developed countries than developing countries due to economic factors. The study further provides effective information for enterprise managers' overseas M&A, as well as provides reference for policy makers to make better use of cultural exports to promote China's economic development.
Bandwidth Optimization using Flex Grid over Conventional Grid for 5G Optical Networks

This research paper is aim to analyze the difference between fix and flex grid plans for 5G multiple-input multipleoutput (MIMO) transmission system. Analysis will be made for different bandwidths i.e., 500GHz, 400GHz, and 350GHz for 20km transmission distance of Multi-mode Fiber (MMF). Both fix and flex-grid plans are studied under the fixed transmission rate (100G) and for different data rates (20G/40G/100G). Purpose of changing the grid plan is to save the bandwidth of an optical communication system that is useless because of guard bands. We have evaluated the spectrum utilization gains using OFDM based transmitters and receivers in MIMO optical networks with flexible grid, and then compared to a conventional grid MIMO transmission optical networks. Results shows that there will be an overall improvement of 30% in capacity of a communication network in using flex-grid plan over the fix-grid plan.
THE TREATABILITY OF CHROMIUM

Leather processing industry wastewaters contain several conventional pollutants as well as micropollutants. Conventional pollutants can be effectively treated although considerable trealment comprised of several stages is required. However, the potential of conventional methods to remove COD and micropollutants has not been fully explored. The purpose of this paper is to investigate the extent of COD removal by conventional methods. Experimental studies are conducted using raw wastewaters of industries applying chromium tanning to cattlehides and sheepskins. Biological treatability after pretrealment by chemical coagulation is assessed using a lab-scale continuous activated sludge system. Results indicate that cbemical coagulation produces wastewaters with a COD of around 2000 mgll almost independent of raw wastewater quality. Activated sludge operated at 0.17 g BODs/g MLSS.d loading is found to provide limited nitrification and almost complete BODs removal while the COD could only be reduced to around 500 mgll. The residual COD identified using a newly developed experimental approach shows that it cannot be reduced lower than 300-550 mgll .
Corporate Governance and Risk Management in Insurance Sector: A review of literature

Better governance leads to better management". This paper shall be useful for increasing the knowledge and awareness of how critical and crucial corporate governance is, especially after the financial crisis that led to a recession in the worldwide economy. This paper is an insight for corporate governance and risk management strategies adopted in different insurance industries across the globe. Because corporate Governance is not only mandatory but also recommended so that companies adhere to best practices. It will correlate the theories formulated for corporate governance and actual practices followed in insurance companies. This paper will brief out the existing literature on this topic along with the results derived from these studies. Finally, it will conclude with recommendations and suggestions based on existing studies.
Study on Natural Convection in a Square Cavity with Wavy right vertical wall Filled with Viscous Fluid

In the present study, natural convection problem has been solved in a cavity having three flat walls and the right vertical wall consisting of one undulation and three undulations. The two vertical and bottom walls are cold walls maintained at a fixed temperature whereas the top wall is heated with spatially varying temperature distribution. Air has been taken as the working fluid with Pr =0.71. This problem is solved by SIMPLE algorithm with deferred QUICK scheme in curvilinear co-ordinates. A wide range of Rayleigh number (10 3 to 10 6 ) has been chosen for this study. For small Ra, the heat transfer was dominated by conduction across the fluid layers. With increase of Ra, the process began to be dominated by convection. In the presence of undulation the peak point of the heat rejection (negative local Nusselt number) in the right wall increases by 5.54% than left wall for Ra = 10 4 . The three undulations case had maximum heat transfer to the uppermost undulation compared to that of the one undulation case.
A Dual Band UWB antenna for WCE Systems

Abstract— In this paper, a compact ultra-wideband (UWB) antenna is designed for Wireless Capsule Endoscopy (WCE) systems by applying several miniaturization and bandwidth enhancement techniques. The antenna is designed on Roger RT5880 as a substrate having εr = 2.2 and thickness of 0.254 mm. The volume of the optimized antenna is only 28.9 mm3. The performances of the antenna are investigated inside a homogeneous human muscle layer. The -10 dB S11 bandwidth for the first band is from 5.72 GHz to 6.26 GHz and for the second band is from 8.12 GHz to 8.58 GHz. It shows omnidirectional radiation patterns. Maximum power of 24 mW can be set as input to the proposed antenna in order to comply with the IEEE C95.1-2005 safety standards.