bluuebunny/crossref_metadata_2025 huggingface dataset:
Heat and temperature metacognition awareness inventory: A confirmatory factor analysis
Authors: Sukarelawan Moh. Irma , Sulisworo Dwi , Jumadi Jumadi , Kuswanto Heru , Rofiqah Siti Anisatur
Published: June 2021

This cross-sectional study aimed to validate students' metacognition awareness inventory in Heat and Temperature material. A total of 167 public senior high school students in Yogyakarta, Indonesia were selected through convenience sampling technique. The heat and temperature metacognition awareness inventory (HeTMAI) inventory consists of six factors, namely: 1) Knowledge of cognition; 2) Planning; 3) Monitoring; 4) Evaluation; 5) Debugging; and 6) Information management. HeTMAI used a 5-point Likert scale. The data was analyzed using the confirmatory factor analysis (CFA) method through the Maximum Likelihood approach. All statistics were found to meet acceptance values. The four GOF indices (χ2/df=2.36, CFI=0.97, TLI=0.97, and SRMR=0.06) have supported the fit of the six-factor HeTMAI model. Standardized factor loading (SFL), construct reliability (CR), average variance extracted (AVE) and discriminant values provide evidence that HeTMAI has sufficient convergent and discriminant validity. Cronbach's alpha value of 0.96 indicated HeTMAI has very adequate evidence of reliability.
Using online multiple choice questions with multiple attempts: A case for self-directed learning among tertiary students
Authors: Lee Ng Wen , Shamsuddin Wan Noor Farah Wan , Wei Lim Chia , Anuardi Muhammad Nur Adilin Mohd , Heng Chan Swee , Abdullah Ain Nadzimah
Published: June 2021

Criticisms on multiple choice questions (MCQs) include the possibility of students answering MCQs correctly by guessing, and MCQs generally are said to fall short in cultivating independent learning skills, such as taking charge of their learning goals. Countering these common concerns, this research used online MCQ exercises with multiple attempts to investigate the experiences that drove students to become self-directed learners. In this research, 60 students completed two sets of online MCQ exercises with multiple attempts outside of classroom time for six weeks consecutively. Both focus group interviews and an online survey were conducted to investigate the experiences of using online MCQ exercise with multiple attempts in relation to the development of self-directed learning (SDL). The findings of the study showed that the criticisms may be unfounded. Data leads to the conclusion that the majority of the students do not just try to guess at the correct answers. Rather, many of them attempted the online MCQ exercises more than once to improve themselves indicating that they were interested in self-learning. Students also reported that they utilised search and inquiry skills that clearly showed motivated initiatives to plan how to overcome their weaknesses by independently looking for relevant resources, determine their own learning goals, and evaluate their own learning performance as a firm indicator of SDL development. Based on the findings, this study is able to refute the claim that MCQs are unable to cultivate independent learning skills.
Teachers’ well-being from the social psychological perspective
Authors: Zakaria Zawawi , Don Yahya , Yaakob Mohd Faiz Mohd
Published: June 2021

School is an important organizational unit in a country. School is also the foundation of every country’s education system. A harmonious working environment and a healthy relationship are very vital to ensure the high quality of teachers’ work. Issues in the workplace can lead to low performance, job dissatisfaction, loss of happiness, stress, and many other mental health issues. Teachers’ well-being is greatly influenced by comfortable, healthy, and happy conditions. Hence, this study aims to examine well-being among teachers in National Secondary Schools (SMK) and Government Funded Religious Schools (SABK) based on the quality of teachers’ working life such as psychological, social, political, and economic needs. This was quantitative research with a survey method using questionnaires as the instrument. The respondents of the study comprised 300 teachers in a district in Kelantan, Malaysia. The respondents were chosen based on a random sampling technique. The results of the study showed that the level of teachers’ well-being is high. There were no differences regarding the level of teachers’ well-being between SMK and SABK.
Impact on teaching in times of COVID-19 pandemic: A qualitative study
Authors: Almonacid-Fierro Alejandro , Vargas-Vitoria Rodrigo , De Carvalho Ricardo Souza , Fierro Manuel Almonacid
Published: June 2021

This article makes an analysis of the pedagogical teaching practices used and developed by Chilean physical education teachers during the coronavirus disease 19 (COVID-19) pandemic periods. The virus from China spread around the world, changed our daily lives and as such, at the same time impacted the educational system in a matter of weeks. Confinement led educational systems to eliminate face-to-face and use virtual teaching in order to continue with the teaching-learning processes, including the physical education discipline. From the methodological point of view, the study is installed in the interpretive-qualitative perspective, in such a way that 14 semi-structured interviews were carried by physical education teachers from the Maule-Chile region, via team, Zoom, Skype, because of the pandemic, face-to-face contact was impossible. The result of the study shows the impact on the quality of life of teachers and students because of the confinement. The pedagogical reconfiguration that teachers experienced in a matter of days, led them to use different virtual platforms to continue connected with their students, in order to deploy the learning objectives defined by the Chilean Ministry of Education. However, the foregoing shows the scarce possibility of verifying student learning, due to the difficulties of monitoring and feedback.
Happiness of university students in new normal Malaysia: The role of mattering, optimism, and social support
Authors: Foo ZeWai , Prihadi Kususanto Ditto
Published: June 2021

Studies among students in higher education have established the sense of altering as one of the predictors of subjective well-being, which represents happiness. However, the transition from the quarantined period to the new normal lifestyle amidst the pandemic in Malaysia might have altered the way mattering predicts happiness. Some studies have reported that students tend to feel less socially supported during online studies, and not every one of them showed high optimism or the belief that a better situation will come soon. We hypothesized that in the new normal, the association between mattering and happiness is fully mediated by perceived social support and optimism. In order to test the hypothesis, 400 university students between 18 to 30 years of age were recruited to respond to the Satisfaction with Life Scale, Revised life orientation test, mattering to others questionnaire, and multidimensional scale of perceived social support. Analyses with Bootstrap method with 5,000 sampling and 95% confidence interval using PROCESS Macro Model 4 yielded results, which suggested that mattering is still a robust predictor of happiness and that both perceived social support and optimism only partially mediated the association. Limitations and suggestions for future studies are discussed.
Reviewing the Van Hiele model and the application of metacognition on geometric thinking
Authors: Naufal Muhammad Ammar , Abdullah Abdul Halim , Osman Sharifah , Abu Mohd Salleh , Ihsan Hisyam , Rondiyah Rondiyah
Published: June 2021

Metacognition, or the ability to think about thinking, is essential in the development of geometric thinking. However, studies on the Van Hiele model and the application of metacognition on geometric thinking are still under-researched. This study aimed to provide a review of the Van Hiele model and the application of metacognition on geometric thinking. A total of 844 articles were retrieved through internet search engines from 1995 to 2020 and manually selected and reviewed systematically. The keywords used related to the Van Hiele model, metacognition, and geometric thinking. The findings that emerged from the review were categorized into two main themes which were the effectiveness of the Van Hiele model towards geometric thinking and the effectiveness of the application of metacognition on geometric thinking. Most articles revealed the positive indication of the geometric thinking development through the Van Hiele model intervention. It also seems that the potential of the application of metacognition in the Van Hiele model can strengthen geometric thinking development. Researchers and educators may find this knowledge useful in conducting empirical studies and developing learning instructions based on the application of metacognition in the development of geometric thinking.
Why students tend to compare themselves with each other? The role of mattering and unconditional self-acceptance
Authors: Kam Shien-Yi , Prihadi Kususanto Ditto
Published: June 2021

Previous studies suggested that university students who are not able to accept themselves tend to develop negative tendency to compare themselves with each other. This study aimed to investigate the role of unconditional self-acceptance (USA) in explaining the association between mattering and social comparison among Malaysian undergraduate students. Three hundred and seventy undergraduate students were recruited and asked to complete an online version of Unconditional Self-Acceptance questionnaire, Iowa-Netherlands Comparison Orientation Measure and University Mattering Scale. Data analysis was conducted by employing Bootstrap Method with 95% confidence interval and 5000 sampling. The result showed that USA partially mediated the relationship between mattering and social comparison. Mattering and USA were identified as robust protective factors of social comparison among university students.
Postgraduate students’ perspective on supporting “learning from home” to solve the COVID-19 pandemic
Authors: Khuluqo Ihsana El , Ghani Abdul Rahman A. , Fatayan Arum
Published: June 2021

The objective of this present research was to reveal how the postgraduate student perceive of or respond to the online learning process. Quantitative method was adopted in this present research. The results showed that most students who had experienced of the online learning activities encountered some obstacles because they had never conducted Learning From Home (LFH) activities before. The respondents were 428 postgraduate students who actively joined in the LFH activities. There were 316 students used the platform Zoom as the supporting application in the LFH activities. Respondents filled in Google Form, then the collected data could be quickly and accurately processed. Other respondents preferred Google Classroom, WhatsApp and other applications in following the learning activities according to the agreement and features provided in each platform. There were 408 respondents experienced Two-ways communication between the lecturers and the students during the LFH activities. They stated that the limited internet network hindered the online lecturing. There were 31 respondents declared that technology limitations hampered the online lecturing and 105 students revealed that it is the limitations in using the application that caused the online lecturing to become obstacles. 
Web-based applications to develop students’ creativity in English for specific purposes
Authors: Simkova Iryna , Bondarenko Oleksandra , Bielovetska Lina
Published: June 2021

This paper investigates the implementation of web-based applications to develop students’ creative thinking skills in English for Specific Purposes. The paper explores the role of web-based applications during creativity development in English for Specific Purposes classes. The attention is paid to the analysis of organizational levels of creative thinking development and concepts of creativity. This paper discusses how to achieve creative thinking during distance learning in English for Specific Purposes classes. The sample was 310 bachelor students from two Ukrainian universities. The sample was selected on the basis of the stratified sampling technique. The instruments were used F-test, the Likert-type scale test, and interviews. The study presents the results gained from interviews with Ukrainian students and results of creativity tests passed by students. The examples of tasks aimed at creative thinking achievement during distance learning in English for Specific Purposes classes are given. A comparative analysis of results has allowed emphasizing the positive experience of two Ukrainian universities, which can be implemented in future distance learning in the higher institutions located in other regions of Ukraine. The findings of this study support the idea that the development of creative thinking skills during the distance learning of bachelor students of different specialism can be intensified with the selection of proper web-based applications.
Effective teachers’ personality in strengthening character education
Authors: Lukman Lukman , Marsigit Marsigit , Istiyono Edi , Kartowagiran Badrun , Retnawati Heri , Kistoro Hanif Cahyo Adi , Putranta Himawan
Published: June 2021

Personality is a silent sedentary nature, which affects the attitudes and behavior of every individual. For a teacher, personality will appear as a hidden curriculum, which affects how to teach and educate. This phenomenological research aimed to interpret the characteristics of effective teachers’ personality in strengthening character education. The participants in this study were 17 elementary, secondary, and high school teachers from nine districts in Indonesia. This participant was selected using purposive sampling technique (teachers who have more than 10 years of teaching experience). Data collection was carried out by interview. Qualitative data analysis was performed using the ATLAS.ti software. The data analysis stages in this study were data coding, data classification, and data interpretation. This study found 12 personality characteristics of teachers that are effective in strengthening character education, include able to behave as friends, able to be roles model, able to understand lessons, discipline, respectful of students, treat students impartially in terms of sanctions, patient, relaxed, willing to pursue life-long learning, master the skill of educating character, not known as fierce teachers, and perceived as joyful teachers. The effective teacher personality can provide understanding and improvement of character education in schools.
Implementation of reduced induction machine fuzzy logic control based on dSPACE-1104 R&D controller board
Authors: Moutchou Mohamed , Jbari Atman , Abouelmahjoub Younes
Published: June 2021

In this paper, we present our contribution in Induction Machine control field. The control we designed is based on fuzzy logic theory, this choice is motivated by the fact that this technique of control is suitable for the control of systems characterized by its parameters uncertainties and variations. The proposed control is optimized by using a genetic algorithm for fuzzy logic controller (FLC) gains tuning and by a good choice of calculation techniques used in FLC. Three versions of IM fuzzy logic control were validated by simulation. After that in order to be able to experimentally implement this control on dSPACE-1104, we proposed an optimized and reduced structure of the control. The experimental results proof the effectiveness and the satisfied performance of the proposed IM fuzzy control.
A study of a single phase grid connected pv inverter performance under a weak grid conditions and distorted grid voltage for Cambodia
Authors: Phoeurn Sovanna , Somkun Sakda
Published: June 2021

A single-phase grid-connected PV inverter performance under a weak grid is a model designed to penetrate PV energy with a weak grid. Usually, this model gets complex and unstable in power system control such as THD growth, harmonic effects, voltage surges, inverter performance. Experimental results would present the impacts on the system which would lead to instability in the grid system. This study was based on inverter performance control, a weak grid control, the grid distortion examination, and harmonic effects. To optimize this grid system, hence, the proposed methods of oscilloscope and power meter were proportionally used to control the grid impacts and stabilities. The results showed that current THD in distorted grid voltage system surged to 8.88%. VPCC growth was 238.11V, equivalent to 8.23% in a weak grid (XL and R). Such a huge increase could prevent the grid system from transferring power for later operation. During the experiment, the inverter, S power and Q power performances stood for good operating processes without impacts on the grid performance. This method  should be applied with a weak grid system because it provided information about grid stability control.
Comparison study of lead-acid and lithium-ıon batteries for solar photovoltaic applications
Authors: Rajanna B. V. , Kumar Malligunta Kiran
Published: June 2021

The battery energy storage systems are very essential for maintaining constant power supply when using solar photovoltaic systems for power generation. The viability and ability of battery energy storage systems are assessed based on battery usage in Solar Photovoltaic utility grid-connected systems. The power supply quality and reliability are improved by utilizing battery energy storage technologies in conjunction with solar photovoltaic systems. This paper presents a comparative analysis of Lead-Acid Storage battery and Lithium-ion battery banks connected to a utility grid. The battery mathematical model simulation study gives their performance characteristics of these batteries under grid-connected loads. Cost-benefit analysis of battery usage for determining the best battery suitable for solar photovoltaic system applications is also presented in this paper.
Analysis of wind speed characteristics using different distribution models in Medan City, Indonesia
Authors: Suwarno Suwarno , Yusuf Ismail , Irwanto M. , Hiendro Ayong
Published: June 2021

Estimating wind speed characteristics plays an essential role in designing a wind power plant at a selected location. In this study, the Weibull, gamma, and exponential distribution models were proposed to estimate and analyze the wind speed parameters and distribution functions. Real measured data were collected from Medan City, Indonesia. The scale and shape factors of wind distribution for three years data were calculated. The observed cumulative probability of the three models was compared to predicted wind characteristics. The probability density function (PDF) and the cumulative density function (CDF) of wind speed were also analyzed. The results showed that the Weibull model was the best model to determine PDF, while the exponential model was the best model to determine CDF for the Medan City wind site.
Nonlinear control of grid-connected wind energy conversion system without mechanical variables measurements
Authors: Noussi Karim , Abouloifa Abdelmajid , Katir Hanane , Lachkar Ibtissam , Giri Fouad
Published: June 2021

This article addresses the problem of controlling an overall wind energy conversion system (WECS) formed by a wind turbine connected to the grid via a doubly fed introduction generator (DFIG) and an AC/DC/AC converter. The main control objectives are fourfold: (i) designing an output feedback speed controller that makes the DFIG rotate at the optimal value delivered by the MPPT strategy, (ii) controlling the stator reactive power so as to be null, (iii) guaranteeing the DC-link voltage in the grid side converter to be at a given constant value, (iv) ensuring a unitary power factor. A high gain observer is synthesized, in order to provide estimated values of the mechanical variables. To achieve the control objectives, a sliding mode controller involving the mechanical observer is designed. The performance of the system configuration based on the 2MW-DFIG with the proposed controller is evaluated by a numerical simulation under a realistic wind profile using MATLAB/SIMULINK/SimPowerSystems environment.
System efficiency prediction of a 1kW capacity grid-tied photovoltaic inverter
Authors: Das Saurav , Chowdhury Dhiman , Razzak Md. Abdur
Published: June 2021

This article presents the system design and prediction performance of a 1kW capacity grid-tied photovoltaic inverter applicable for low or medium-voltage electrical distri-bution networks. System parameters, for instance, the longitude and latitude of the solar plant location, panel orientation, tilt and azimuth angle calculation, feasibility testing, optimal sizing of installment are analyzed in the model and the utility is sim-ulated precisely to construct an efficient solar power plant for residential applications. In this paper, meteorological data are computed to discuss the impact of environmen-tal variables. As regards ensuring reliability and sustenance, a simulation model of the system of interest is tested in the PVsyst software package. Simulation results yield that the optimum energy injected to the national grid from the solar plant, specific pro-duction, and performance ratio are 1676kWh/year, 1552kWh/kWp/year, and 79.29% respectively. Moreover, the predicted carbon footprint reduction is 23.467 tons during the 30 years lifetime of the system. Therefore, the performance assessments affirm the effectiveness of the proposed research.
Machine learning based multi class fault diagnosis tool for voltage source inverter driven induction motor
Authors: R Jyothi , Holla Tejas , Rao K Uma , R Jayapal
Published: June 2021

AC drives are employed in process industries for varying applications resulting in a wide range of ratings. The entire process industry has seen a paradigm shift from manual to automated systems. The major factor contributing to this is the advanced power electronics technology enabling power electronic drives for smooth control of electric motors. Induction motors are most commonly used in industries. Faults in the power electronic circuits may occur periodically. These faults often go unnoticed as they rarely cause a complete shutdown and the fault levels may not be large enough to lead to a breakdown of the drive. An early detection of these faults is required to prevent their escalation into major faults. The diagnostic tool for detection of faults requires real time monitoring of the entire drive. In this work, detailed investigation of different faults that can occur in the power electronic circuit of an industrial drive is carried out. Analysis and impact of faults on the performance of the induction motor is presented. A real time monitoring platform is proposed to detect and classify the fault accurately using machine learning. A diagnostic tool also is developed to display the severity and location of the fault to the operator to take corrective measures.
Analysis and design of class E-LCCL compensation circuit topology circuit topology for capacitive power transfer system
Authors: Hasan Khairul Kamarudin , Saat Shakir , Yusop Yusmarnita , Majid Masmaria Abdul , Ramli Mohd Sufian
Published: June 2021

This research introduces the analysis and design of Class E-LCCL for capacitive power transfer (CPT) system. The CPT Class-E LCCL system is able to operate at high-frequency with decreased capacitance plate size and at reduced power losses by minimising switching losses. Additionally, the design of a CPT Class-E LCCL power amplifier is less complicated, since it is usually lighter and smaller with comparative intolerance to different circuit variants; hence, enabling the possibility of miniaturising the system. In this work, the capability of the CPT Class-E LCCL CPT system powered by 24 V DC supply voltage while operating at 1 MHz was analysed via experimental works and extensive simulation. Lastly, a CPT Class-E LCCL system prototype was built, generating 10 W output power via a 0.1 cm air gap at a near-perfect efficiency level of 96.68%. These findings could be beneficial for household apparatus, medical implants, and charging consumer electronics.
Variable reluctance synchronous machines in saturated mode
Authors: Hanene Hleli , Aymen Flah , Souhir Tounsi
Published: June 2021

Electric vehicle seems largely based on electrical machines. Finding the best motor type seems be important for having more performances and a transport system robustness. In this work, we present an analytical model of the synchronous machine with variable reluctances in linear and saturated modes. The angular position of the rotor (θ) and the phase current (i) will beused as parameters. The analytical model of this machine will allow us to determinate its magnetic characteristics such inductors, magnetic flux and electromagnetic torque. The results obtained by the analytical model are compared with those obtained by the finite element method. So, basing on Matlab/Simulink tool and by working with finite element method, these results are depicted and the paper objective is illustrated.
Detailed modelling and simulation of different DC motor types for research and educational purposes
Authors: Sami Saif Sabah , Obaid Zeyad Assi , Muhssin Mazin T. , Hussain Ali N.
Published: June 2021

The devastating impact of Covid-19 pandemic accelerated the shift to e-learning in the higher education. Particularly in the electrical machines courses, that often include laboratory experiments. However, no detailed models of DC motors, developed in MATLAB/Simulink, were reported in literature.  Hence, in this paper, a virtual laboratory consist of models of DC motors was built for the first time. The proposed models are easy to use and modify, and allow all machines’ parameters to be altered for students to replicate easily to support and enhance the learning process of electrical machines courses. Consequently, the developed models are effective tools for educational and research purposes. Dynamic models of DC motors were developed using MATLAB/Simulink, namely separately excited, permanent magnet, shunt-connected and series-connected DC motors. Two different approaches for modelling were proposed, the block diagram representation and Simscape based models. The two modelling methods were validated against the built-in DC machine model. The proposed models are easy to use and modify, and allow all machines’ parameters to be altered for monitoring and comparison purposes. Consequently, the developed models are effective tools for research and educational purposes.
A modal analysis based on reactive power compensation on 6-bus Oman electrical grid
Authors: Al Mamari Adnan Saif , Toha Siti Fauziah , Ahmad Salmiah , Al Mamari Ali Salim
Published: June 2021

This paper covers the modal analysis application (MATLAB 2019a) for improving the voltage profiles by optimum positioning of the capacitor banks for 6-bus Oman Electrical System because the Oman electricity TransmissionCompany (OETC) is suffering of drop voltage in these 6 buses especially during summer season as a peak period. The Newton-Raphson (N-R) method will help to determine the required reactive power for each load bus and as well the ideal position or point of capacitors. The process aims to maintain the Q-V relations of the electrical grid by correlating the lowest Eigen-values to related Eigen-vectors in obtained Jacobian matrix. It depends on the Eigen-values, if they are positive then the system’s voltage is stable otherwise it is not stable. In a stable system, the potential voltage collapse could be anticipated by checking the participation factors for a group of minimal positive Eigen-values. In general, the critical weak bus is associated with lowerEigen-values. Electrical system collapse is attributable to the weakest bus in the network and it could be avoided by determining the weak buses and providing capacitor banks at suitable locations which will lead to improve the voltage stability margin.
PID speed control of DC motor using meta-heuristic algorithms
Authors: Acharya Bishwa Babu , Dhakal Sandeep , Bhattarai Aayush , Bhattarai Nawraj
Published: June 2021

This paper presents archimedes optimization algorithm(AOA) and dispersive flies optimization(DFO) to optimally tune gain parameters of PID control scheme in order to regulate DC motor’s speed. These suggested techniques tune the controller by the minimization of the fitness function represented by the integral of time multiplied by absolute error (ITAE). The modelling and simulation are carried out in MATLAB/Simulink. The transient response of unit step input obtained from AOA-PID-ITAE andDFO-PID-ITAE controllers were compared to those obtained from Ziegler-Nichols (ZN) method and particle swarm optimization(PSO). The results indicate that AOA-PID-ITAE and DFO-PID-ITAE are more efficient than ZN method and PSO in reducing rise time and settling time. Likewise, DFOconverge faster to the optimal solution with lower overshoot than AOA and PSO.
Design of a high performance AC-DC LED driver based on SEPIC topology
Authors: Ferdous Fouzia , Rashid A. B. M. Harun Ur
Published: June 2021

Light emitting diodes (LEDs) are current driven devices. So, it is essential to maintain the stability of LED voltage and current. Variation of temperature may cause of instabilities and bifurcations in the LED driver. Driving LEDs from an offline power source faces design challenges like it have to maintain low harmonics in input current, to achieve high power factor, high efficiency and to maintain constant LED current and to ensure long lifetime. This paper proposes the technique of harmonics reduction by using parametric optimization of Single ended primary inductor converter (SEPIC) based LED driver. Without optimization of SEPIC parameters input energy will not be properly transferred to the load and this un-transferred energy will be transmitted to the source. Consequently, the quality of input current will be hampered i.e. harmonics will contaminate the input current. Focussing this, the paper has presented the design of a non-isolated integrated-stage single-switch constant current LED driver operating in discontinuous conduction mode (DCM) in SEPIC incorporating the design of control circuit with soft start mechanism. This LED driver has achieved a good efficiency (90.6%) and high-power factor (0.98) with reduced harmonics (3.35%). System stability has been determined and simulation studies are performed to confirm the validity of the LED driver circuit. A laboratory prototype is built.
A nine-switch nine-level converter new topology with optimal modulation control
Authors: Majdoul Radouane , Touati Abelwahed , Ouchatti Abderrahmane , Taouni Abderrahim , Abdelmounim Elhassane
Published: June 2021

Multilevel power converters are becoming increasingly used in several sectors: energy, grid-tie renewable energy systems, High voltage direct current (HVDC) power transmission, and a multitude of industrial applications. However, the multilevel converters consist of several drives and a high number of power switches, which leads to a considerable cost and an increased size of the device. Thus, a novel topology of a multilevel bidirectional inverter using a reduced number of semiconductor power components is proposed in this paper. Without any diode clamped or flying capacitor, only nine switches are used to generate nine voltage levels in this new topology. The proposed multilevel converter is compared with the conventional structures in terms of cost, the number of active power switches, clamped diodes, flying capacitors, DC floating capacitors, and the number of DC voltage sources. This comparative analysis shows that the proposed topology is suitable for many applications. For optimum control of this multilevel voltage inverter and to reduce switching losses in power semiconductors, a hybrid modulation technique based on fundamental frequency modulation and multi-carrier-based sinusoidal pulse-width modulation schemes is performed. The effectiveness of the proposed multilevel power converter is verified by simulation results.
Minimal switching of multiple input multilevel output DC-DC converter
Authors: Chlaihawi Amer A. , Al-Modaffer Ameen , Jedi Hur
Published: June 2021

This paper proposes a minimal switching multiple input multilevel output (MS-MIMLO) DC-DC converter. Minimizing the cost of operation is an utmost priority of any electric circuit design. Thus, reduction number of switches that control and manage the operation of feeding power into the MIMLO DC-DC convertors is presented. The proposed MS-MIMLO DC-DC converter exerts many advantages, include high voltage transfer ratio with a small size inductor, reduced power losses and low voltage stress across the semiconductor devices. Beside the highly conversion ratio and efficiency, the characteristics of the proposed converter have a simple configuration with low number of components as well. The MATLAB/Simulink software was implemented to simulate the proposed topology in order to verify the performance of the MS-MIMLO DC-DC converter. The result of simulations demonstrated the benefits of reducing the number of switches without affecting the operation and performance of the MIMLO DC-DC converter circuit.
Processor performance metrics analysis and implementation for MIPS using an open source OS
Authors: Eswer Varuna , Naik Dessai Sanket S
Published: June 2021

Processor efficiency is a important in embedded system. The efficiency of the processor depends on the L1 cache and translation lookaside buffer (TLB). It is required to understand the L1 cache and TLB performances during varied load for the execution on the processor and hence studies the performance of the varing load and its performance with caches with MIPS and operating system (OS) are studied in this paper. The proposed methods of implementation in the paper considers the counting of the instruction exxecution for respective cache and TLB management and the events are measured using a dedicated counters in software. The software counters are used as there are limitation to hardware counters in the MIPS32. Twenty-seven metrics are considered for analysis and proper identification and implemented for the performance measurement of L1 cache and TLB on the MIPS32 processor. The generated data helps in future research in compiler tuning, memory management design for OS, analysing architectural issues, system benchmarking, scalability, address space analysis, studies of bus communication among processor and its workload sharing characterisation and kernel profiling.
Indicadores para um modelo de análise do jogo de handebol na categoria Sub-14 a partir da opinião de treinadores
Authors: Madeira Mayara Gonçalves , Estriga Maria Luísa Dias , Menezes Rafael Pombo
Published: June 2021

Diferentes métodos têm sido utilizados para a análise do jogo de handebol pautados em indicadores da categoria adulta, de difícil generalização para outras categorias (como a sub-14). O objetivo deste estudo foi mapear os indicadores relevantes para a análise do jogo no domínio da categoria sub-14 do handebol, com base na opinião de treinadores de handebol (n=6). Para este efeito, foram relizadas entrevistas com treinadores do Estado de São Paulo, analisadas a partir do método do Discurso do Sujeito Coletivo. Indicadores para a análise de jogo foram determinados a partir da análise da opinião dos inquiridos e por recurso a fontes documentais (textos técnicos). Foram identifi cados 18 indicadores relacionados com os fundamentos técnico-táticos individuais (11 defensivos e sete ofensivos) e 12 relacionados aos meios táticos grupais e coletivos (cinco defensivos e sete ofensivos). Os indicadores remetem à necessidade de se considerar os constrangimentos situacionais em que se manifestam. Sugere-se, assim, que as propostas para a análise de jogo nessa categoria considerem as relações entre companheiros e adversário, tendo por base as unidades táticas funcionais 1x1, 2x2 e 3x3. Espera-se que esta abordagem permita contribuir para um melhor entendimento da dinâmica de jogo, indo além da mera contabilização do número de ocorrências por indicador de análise.
Efeitos agudos do treinamento intervalado de alta intensidade sobre a pressão arterial de adolescentes com sobrepeso/obesidade
Authors: Faria Waynne Ferreira de , Elias Rui Gonçalves Marques , Santos Géssika Castilho dos , Gonçalves Ezequiel Moreira , Sasaki Jeffer Eidi , Stabelini Neto Antonio
Published: June 2021

O objetivo deste estudo foi analisar o comportamento da pressão arterial (PA) em adolescentes com excesso de peso após uma sessão de high intensity interval training (HIIT) na esteira ergométrica. Trata-se de uma pesquisa com delineamento cross-over aleatorizado, a amostra foi formada por 11 adolescentes do sexo masculino, 81,81% com obesidade e idade entre 15 e 18 anos. Os voluntários realizaram dois protocolos experimentais: controle e HIT. O protocolo HIIT foi constituído de cinco séries de 85 a 95% do VO2pico por um minuto, intercalados por três minutos de recuperação de 40 a 50% do VO2pico. Antes e após os protocolos, os  parâmetros  hemodinâmicos  foram  obtidas  por  meio  de  um  monitor  automático  (SpaceLabs  90207),  programado para realizar medidas a cada 20 minutos no período das 12:00 às 22:00 horas. Foi observado diferença signifi  cativa entre as médias da pressão sistólica nos protocolos controle e HIIT somente na primeira hora após o fi nal do exercício (131,90±7,93 vs 124,18±7,56 mmHg). A comparação entre os protocolos e as medidas hemodinâmicas pré-sessão e média pós-sessão (10 horas) demonstrou que o HIIT promoveu uma redução signifi cativa na pressão arterial média em comparação a pré-sessão. Em conclusão, o protocolo HIIT empregado promoveu efeito hipotensor de baixa magnitude sobre as medidas hemodinâmicas pós-exercício no que diz respeito a PAS.
Escala de percepção de esforço para criança (EPEC): validação para o português em um teste submáximo
Authors: Martins Renata , Wamosy Renata Maba Gonçalves , Minsky Rafaela Coelho , Mayer Anamaria Fleig , Schivinski Camila Isabel Santos
Published: June 2021

O objetivo do presente estudo é traduzir e validar, para a língua portuguesa do Brasil, a escala de percepção de esforço para crianças (EPEC). Para isto, toda a etapa de tradução da PES-C, da língua inglesa para a portuguesa (do Brasil), foi realizada com base no protocolo proposto por Guillemin et al.19. Para validação da escala, esta foi aplicada durante a realização do teste de caminhada de seis minutos (TC6). A validade da EPEC foi avaliada com o uso do coeficiente de correlação de Pearson, para verifi car o grau de associação com a escala de Borg. Para a estabilidade das respostas, calculou-se o erro padrão da média (EPM) e coeficiente de correlação intra-classe (ICC). Calculou-se o erro padrão da estimativa das medidas de percepção finais (EPE) de cada dia para analisar o grau de desvio dos dados obtidos. Para avaliação da fidelidade utilizou-se o alpha de Cronbach, no sentido de se analisar a consistência interna deste instrumento. Neste estudo participaram do processo de validação da EPEC 36 crianças, com média de idade de 10±2,61 anos, sendo 50% de meninas. No cálculo do EPM, encontrou-se um valor de 0,05 para o primeiro dia e 0,03 no segundo dia, caracterizando uma variabilidade baixa. O EPE foi de 0,33 no primeiro dia e 0,41 no segundo dia, demonstrando um erro baixo. A consistência interna apresentou coeficiente alfa de Cronbach de 0,865. A escala EPEC foi validada para a população de crianças brasileiras, demonstrando também ser reprodutível em testes submáximos.
Os desafios da Gestão Participativa de Áreas de Proteção Ambiental (APAs) no Brasil e as Contribuições da Noção de Negociação Política
Authors: Borges da Costa Guilherme , Silva Alessandro Soares da
Published: June 2021

Desde a instituição do Sistema Nacional de Unidades de Conservação da Natureza (SNUC) por meio da Lei Federal n.º 9.985/2000, a gestão participativa de Unidades de Conservação (UCs), entre elas as Áreas de Proteção Ambiental (APAs), passou a ser obrigatória no Brasil. O documento determina que estas áreas devem dispor de um conselho presidido pelo órgão responsável por sua administração e constituído por representantes dos órgãos públicos, de organizações da sociedade civil e da população residente. Entretanto, embora o dispositivo legal determine tal perfil para a gestão destas áreas, a realidade tem se mostrado outra. Dados do Cadastro Nacional de Unidades de Conservação apontam, por exemplo, que passados 13 anos da instituição da lei, existem unidades que não constituíram conselho gestor ou elaboraram um plano de manejo, documento que orienta o uso e ocupação do território protegido. Em uma perspectiva acadêmica, a literatura acerca do tema pouco trata do processo de participação em si, sobre as dinâmicas que se dão no momento em que esta acontece, os jogos de interesses e os conflitos inerentes aos sujeitos e grupos, ou seja, sobre o processo de negociação que ocorre ao se realizar uma gestão por conselho. Diante deste cenário, o presente artigo apresenta e discute, a partir de revisão de literatura, a noção de negociação política e as práticas que a ela se relacionam, apontando caminhos para o estudo e a prática da gestão participativa de áreas de proteção.
Democracia Hoje: Estado, instituições e políticas públicas
Authors: Penko Caio
Published: June 2021

Resemha sobre o livro “Estado, Governo e Administração Pública”, de autoria do prof. Dr. Marco Antonio Carvalho Teixeira, publicado em 2012 pela editara FGV na coleção Práticas de Gestão. O livro serve como um referencial introdutório necessário e, também, oportuno aos interessados que objetivam uma compreensão mais detida e preocupada com as políticas públicas. Portanto, o livro consiste em uma leitura indispensável para reflexão e entendimento sobre o papel do Estado.
A Judicialização da Política e os Limites da Interpretação Constituciuonal: um estudo de caso
Authors: Assis Luiz Gustavo Bambini de
Published: June 2021

O pretende artigo tem por objetivo analisar o processo interpretativo do Supremo Tribunal Federal, a partir de um estudo de caso específico e como essa atividade vem interferindo, nos últimos anos, na redefinição de poderes da República sob a perspectiva de elaboração das políticas públicas nacionais.
Universidades Federais Brasileiras e o Impacto Regional do REUNI
Authors: Zambello Aline Vanessa
Published: June 2021

Nos últimos dez anos observamos uma transformação importante no cenário universitário federal. A trajetória da educação superior no Brasil criou um panorama onde o setor privado prevaleceu e que cresceu desordenadamente entre as regiões na distribuição de vagas e instituições de ensino superior. Com a expansão recente das universidades federais por meio do programa REUNI, essas instituições assumem lugar de destaque nas políticas públicas para educação superior. Neste artigo trabalhamos com a hipótese de que o REUNI foi implementado no sentido de privilegiar o equilíbrio entre as regiões, dado presente nos documentos da política. Para tanto, faremos uma comparação entre os períodos 1994-2001 e 2002-2010. Como resultados do estudo apresentamos dois cenários distintos que se formam em relação ao número de vagas e instituições nas diferentes macrorregiões brasileiras. Nesse sentido, haveria, ainda que timidamente, o entendimento da função supletiva da União quanto a equalização das oportunidades educacionais conforme CF de 1988 art. 211.
Modelos Teóricos Explicativos Para Instituições Participativas: construção de um quadro conceitual
Authors: Costa André Galindo da , Peres Ursula Dias
Published: June 2021

Na década de 1980, junto ao processo de redemocratização, o Brasil desenvolveu diversos arranjos participativos. Estes arranjos se tornariam ainda mais marcantes no cenário político nacional entre as décadas de 1990 e 2000, passando a compor parte da estrutura da administração pública brasileira. Orçamentos participativos, conselhos Artigo Modelos Teóricos Explicativos Para Instituições Participativas: Construção de um Quadro Conceitual Explanatory Theoretical M odels to Participatory Institutions: Building a Conceptual Framework  Los modelos teóricos explicativos de las instituciones participativas: La construcción de un marco conceptual    Galindo da Costa, André & Peres, Ursula Dias. RG&PP vol. 4(1): 1-21, 2014 2 de políticas públicas, planos diretores e audiências públicas são alguns exemplos de instâncias participativas nas diferentes esferas de governo. Cada um desses arranjos possui certa relevância para determinado processo político, sendo inovações criadas em governos para atender à crescente necessidade de abertura política da redemocratização. O artigo tem dois objetivos: O primeiro é apresentar a dinâmica histórico-social que influenciou o cenário de surgimento desses espaços participativos. Em segundo lugar, apresentar as teorias mais influentes na explicação dos fenômenos envolvidos nesse tipo de inovação democrática. Para tanto, o artigo destaca três modelos teóricos com potencial explicativo sobre as instituições participativas, os quais são: Teoria da Aprendizagem Social, Teoria da Estrutura de Oportunidade Política e Crítica à Teoria Normativa da Sociedade Civil.
Análise de Bem-Estar no Mercado Brasileiro de Telefonia
Authors: Nishujima Marislei , Lima Marcos André de Mattos
Published: June 2021

O artigo avalia o efeito da tarifa de terminação fixo-móvel, a VU-M, sobre o bem-estar do mercado de telefonia a partir de simulações parametrizadas para a economia brasileira. Além disso, gera evidências empíricas sobre a existência de efeito waterbed - relação negativa entre a tarifa de interconexão, VU-M, e o valor da assinatura básica - no segmento de telefonia móvel. As estimativas foram obtidas a partir dos microdados da PNAD de 2008 e 2009 e dos preços de telefonia móvel e fixa da ANATEL. A literatura, ainda incipiente, não apresenta consenso sobre este tema. O conhecimento e a magnitude do efeito importam do ponto de vista da política regulatória. Os resultados apontam para a não predominância do efeito para o mercado brasileiro, e, portanto, de relação negativa entre o valor da VU-M e o bem-estar social.
Oficinas Participativas na Elaboração do Plano de Manejo da APA-VRT
Authors: Silva Alessandro Soares da , Costa Guilherme Borges da , Mello-Théry Neli Aparecida de , Zago Ramon , Ferreira Tatiane Moraes , Sato Danilo Pereira , Tozato Heloísa de Camargo , Cavicchioli Andrea
Published: June 2021

O presente artigo trata dos processos de participação social e política na produção do Plano de Manejo da Área de Proteção Ambiental da Várzea do Rio Tietê (APA-VRT) localizada no estado de São Paulo, Brasil. Esta APA é composta por doze municípios, foi criada em 1987 e seu plano de manejo foi realizado mais de 20 anos depois. O trabalho de produção deste documento iniciou em 2011 e foi conduzido por pesquisadores da Universidade de São Paulo. Neste artigo descreveremos e analisaremos os processos relativos à organização e implementação da oficina de Diagnóstico Socioambiental nas quais se assentaram os primeiros contatos entre Estado e sociedade civil em torno ao tema do plano de manejo da APA-VRT.