Miracle-dz/UniFAR-FTUs huggingface dataset:
Improved Modulation Strategy for Single-Phase Isolated Quasi-Single-Stage AC–DC Converter to Improve Current Characteristics

In this article, an improved triple-phase-shift (ITPS) modulation for the single-phase isolated quasi-single-stage ac–dc converter is proposed to realize the current decouple between the adjacent switching periods and to reduce the grid current distortion. Moreover, the dead band effect on the proposed ITPS is analyzed for the first time. It reveals that the dead band causes not only the current couple and accordingly the grid current distortion but also the current amplitude loss. A two-step phase-shift compensation scheme is proposed based on the analysis result to solve the problems caused by the dead band. All of the theoretical analysis, the proposed ITPS modulation, and the dead band compensation scheme are validated in detail in the experimental way.
A Different Voltage-Source Power Inverter with Carrier Based SPWM for Open-End Connection Loads

This paper presents a new configuration of voltage source inverter with a simplified circuit for generating five-level pulse width modulation (PWM) voltage waveform. Compared with conventional inverter configuration, this circuit is drastically able to simplify the structure and reduce the required number of active switch components. The new inverter circuit is very suitable for the use of open-end connection loads such as open-end winding ac motor drive application. Instead of using separated dc power sources, the new inverter circuit configuration is also possible to utilize only one dc voltage source, so the power supply circuits can be made simpler. Furthermore, to reduce ripples of dc capacitor voltages, the voltage stabilizing circuit of capacitors at the input side was proposed and applied. The stabilizing circuit is capable to work reducing the size of dc capacitors, and maintaining voltage stability of capacitors through charging and discharging operation modes. The working principles of inverter circuit were evaluated and examined by means of computer simulations using PSIM software. In addition, experimental test results of the prototype were also provided. Test results proved that the new five-level PWM inverter operated well generating five-level output waveform with smaller distortion and less voltage ripples of dc capacitors.
A Method for Static and Dynamic Interval Detection within the IMU Calibration Procedure

An Inertial Measuring Unit (IMU) is used for measuring linear accelerations and angular velocities in 3D/2D space. IMU devices are usually designed as micro-electro-mechanical systems (MEMS), which are produced in small form factor and are widely used in robotics, mobile phones and drones. Depending on the quality of the device, they can be divided into low-cost and high-cost IMUs. The main difference between them is the accuracy of measurements and IMUs mechanical alignment on the printed circuit board. The high-cost IMUs are well calibrated and have a relatively small error and noise level for different kinds of parameters. In contrast, the low-cost IMUs have a larger error component, where body frame axes are non-orthogonal for both the accelerometer and gyroscope due to weak factory calibration, high noise and high sensitivity dependence from the temperature, misalignment of body frame due to packaging and assembly processes. This paper provides a new method for the IMU static and dynamic interval detection within the IMU calibration procedure, which is designed by other authors for the case of IMU calibration without any external equipment. This procedure uses a sequence of alternating static and dynamic intervals for accelerometer calibration and then gyroscope calibration. The accuracy of the IMU calibration procedure depends strongly on how precisely static and dynamic intervals have been detected. Otherwise, the calibration results are unsuitable. The new method for static and dynamic interval detection provides more robust and less noisy results, requires a significantly smaller number of operations and is easy to implement. The paper provides comparative results for both methods and refers to the source code for the new method.
Pilot competencies as components of a dynamic human‐machine system

This paper formulates a theoretical model of flight deck team performance as a dynamic human‐machine system, later referred to as CRM‐DYMO (Crew Resources Management‐DYnamic MOdel). The model identifies human and machine subsystems. The human subsystem describes the activities taken by the flight crew and the machine subsystem describes the changes in the aircraft's state. The human subsystem's output forms an input for the machine subsystem, and the machine subsystem's output feeds back to the human system creating a closed loop system. Pilots’ performance are described as competencies, which form part of the elements in the human subsystem. This paper concentrates only on CRM competencies as defined by the International Civil Aviation Authority and the International Air Transport Association. In addition to the detailed conceptual model of the human subsystem and associated competencies, the approach is illustrated with reference to two accident case studies. These demonstrate how CRM‐DYMO can assist in analyzing CRM and help in identifying how the different system components interact. Although the case studies demonstrate the benefits of CRM‐DYMO, they merely serve as a starting point to understand how CRM works and will hopefully encourage supporting quantitative simulation modeling and empirical studies.
A Si-FET-Based High Switching Frequency Three-Level LLC Resonant Converter

This paper highlights the proposed silicon field-effect transistor (Si-FET)-based high switching frequency three-level (TL) LLC resonant converter. It provides a detailed operational analysis of the converter; the multilevel (ML) organization of cells; voltage-balancing principles; current-balancing principles; loss comparison between Si-FETs and gallium-nitride (GaN)-FETs; and an optimal design consideration based on loss analysis. This analysis reveals that the switching losses of all power switches can be considerably reduced as the voltage across each switch can be set to half of the input voltage without an additional circuit or control strategy. Moreover, the current of each resonant inductor is automatically balanced by a proposed integrated magnetic (IM)-coupled inductor. Therefore, the operating frequency can be easily increased to near 1 MHz without applying high-performance switches. In addition, the resonant tanks of the converter can be a group of cells for multilevel operation, which indicates that the voltage across each switch is further reduced as more cells are added. Based on the results of the analysis, an optimal design consideration according to the resonant tank and switching frequency is discussed. The proposed converter was validated via a prototype converter with an input of 390 V, an output of 19.5 V/18 A, and a frequency of 1 MHz.
Names and the value of a human person

How many people actually know what their first names mean? In the four years that I have spent outside of my home country in Nigeria, I have frequently asked the people I meet in Europe and the United States what their names actually mean. I have always found it amazing to get replies such as: I do not know? Who cares? Why is that important? Such responses are very different from the typical response of an African.
Time Integration-Based IGD Methods for Eigen-Analysis of Large Delayed Cyber-Physical Power System

Two spectral discretization methods based on linear multistep and implicit Runge-Kutta discretization of infinitesimal generator (IGD-LMS/IRK) are presented in this paper for eigen-analysis of large delayed cyber-physical power system (DCPPS) with large time delays. First, the whole delay interval is partitioned into several sub-intervals by time delays in the system. The piecewise partitioning allows the avoidance of interpolations in evaluating system states at the delay points. Second, two time integration methods, i.e., LMS and IRK, are utilized to discretize infinitesimal generator on each sub-interval, resulting in highly structured and sparse discretization matrices. Third, IGD-LMS/IRK are efficiently implemented to compute the system's electromechanical oscillation modes. The shift-invert preconditioning technique is used and the sparsity in augmented system state matrices is exploited to guarantee the efficiency and scalability of IGD-LMS/IRK in dealing with large DCPPS. Numerical results on the two-area four-machine test system and a real-life large transmission grid validate the improved efficiency and accuracy of the proposed methods in analyzing DCPPS with large time delays.
Camera and Lidar Cooperation for 3D Feature Extraction

The objective of this work is to use efficiently various sensors to create a SLAM system. This algorithm has to be fast (real-time), computationally light and efficient enough to allow the robot to navigate in the environment. Because other processes embedded require large amount of cpu-time, our objective was to use efficiently complementary sensors to obtain a fairly accurate localization with minimal computation. To reach this, we used a combination of two sensors: a 2D lidar and a camera, mounted above each other on the robot and oriented toward the same direction. The objective is to pinpoint and cross features in the camera and lidar FOV. Our optimized algorithms are based on segments detection. We decided to observe intersections between vertical lines seen with the camera and locate them in 3D with the ranges provided by the 2D lidar. First we implemented a RGB vertical line detector using RGB gradient and linking process, then a lidar data segmentation with accelerated computation and finally we used this feature detector in a Kalman filter. The final code is evaluated and validated using an advanced real-time robotic simulator and later confirmed with a
Impact of Electrical Topology, Capacity Factor and Line Length on Economic Performance of Offshore Wind Investments

In this study, an economic performance assessment of offshore wind investments is investigated through electrical topology, capacity factor and line length. First, annual energy yield production and electrical system losses for AC and DC offshore wind configurations are estimated by using Weibull probability distributions of wind speed. A cost model for calculating core energy economic metrics for offshore wind environment is developed by using a discount cash flow analysis. A case study is then conducted for a projected offshore wind farm (OWF) rated 100 MW and 300 MW sizes situated in the Aegean sea. Finally, a sensitivity analysis is performed for AC and DC OWFs with three different capacity factors (e.g., 45%, 55% and 60%) and various transmission line lengths ranging from 20 km to 120 km. The OWF is found to be economically viable for both AC and DC configurations with the estimated levelized cost of electricity (LCOE) ranging from 88.34 $/MWh to 113.76 $/MWh and from 97.61 $/MWh to 126.60 $/MWh, respectively. LCOEs for both options slightly change even though the wind farm size was increased three-fold. The sensitivity analysis reveals that, for further offshore locations with higher capacity factors, the superiority of AC configuration over the DC option in terms of LCOE reduces while the advantage of DC configuration over the AC option in terms of electrical losses is significant. Losses in the AC and DC configurations range from 3.75% to 5.86% and 3.75% to 5.34%, respectively, while LCOEs vary between 59.90 $/MWh and 113.76 $/MWh for the AC configuration and 66.21 $/MWh and 124.15 $/MWh for the DC configuration. Capacity factor was found to be more sensitive in LCOE estimation compared to transmission line length while line length is more sensitive in losses estimation compared to capacity factor.
Intelligent Mapping Method for Power Consumption and Delay Optimization Based on Heterogeneous NoC Platform

As integrated circuit processes become more advanced, feature sizes become smaller and smaller, and more and more processing cores and memory components are integrated on a single chip. However, the traditional bus-based System-on-Chip (SoC) communication is inefficient, has poor scalability, and cannot handle the communication tasks between the processing cores well. Network-on-chip (NoC) has become an important development direction in this field by virtue of its efficient transmission and scalability of data between multiple cores. The mapping problem is a hot spot in NoC's research field, and its mapping results will directly affect the power consumption, latency, and other properties of the chip. The mapping problem is a NP-hard problem, so how to effectively obtain low-power and low-latency mapping schemes becomes a research difficulty. Aiming at this problem, this paper proposes a two-populations-with-enhanced-initial-population based on genetic algorithm (TI_GA) task mapping algorithm based on an improved genetic algorithm from the two indexes of power consumption and delay. The quality of the initial individual is optimized in the process of constructing the population, so the quality of initial population is improved. In addition, a two-population genetic mechanism is added during the iterative process of the algorithm. The experimental results show that TI_GA is very effective for optimizing network power consumption and delay of heterogeneous multi-core.
Experimental and theoretical study on the shear behavior of single‐ and multi‐span T‐ and I‐shaped post‐tensioned beams

In recent years, the assessment of the shear resistance of existing post‐tensioned multispan bridges has become a frequent task for civil engineers. New models developed for this purpose need to be verified, since the number of shear‐related results of tests executed under real loading conditions at the interior support of multispan systems is very limited. In this study, eight shear tests carried out on four specimens are presented. The effects of different prestressing grades, cross‐sections, and amounts of transverse reinforcement are investigated. Two test setups were used in order to reproduce the internal forces occurring at the interior and end supports, respectively, of actual multispan bridges. With the aid of close‐range photogrammetry, detailed measurements of the kinematics of the critical flexural‐shear cracks were performed. In this study, it is demonstrated that arching action plays a major role for the shear capacity of slender post‐tensioned beams. The predictions of the shear capacity determined with various shear design models show that these models are conservative, especially with respect to the shear capacity for the region around the interior supports. However, the evaluation of the models also shows that the flexural‐shear crack model yields very promising results of the shear capacity of post‐tensioned beams with low shear reinforcement ratios.
A Physical Probabilistic Network Model for Distribution Network Topology Recognition Using Smart Meter Data

Given the considerable scale of distribution networks in urban and rural areas, as well as the lack of management records, adjustments of switches during the distribution system operation are poorly documented. Such deficiency results in the inaccuracy of models stored in the distribution network automation system, and thus misleads the state estimation. With the emergence of information and communication technology, a large number of the feeder and residential smart meter data are accumulated. Such data can help recognize the operation modes of distribution networks by analyzing the relationships between the on/off states of switches and the voltage correlations among buses. However, the limited quantity and quality of the sampling data restrict the implementation of data-driven recognition. In this paper, a physical-probabilistic-network (PPN) model applied for inferring overall operation mode of distribution networks is proposed. Based on which, a belief propagation-based algorithm is proposed for the inference even under situations when there are only partial bus voltages data available. Meanwhile, the required variable for inference can be reduced from the active trail analysis. Experiment results are used to compare its performance with classic methods and to prove its effectiveness and advantages.
Protocolo para la detección de la simulación del dolor en la práctica clínica: estudio de casos

Se propone un protocolo para la deteccion de la simulacion de dolor en la practica clinica de tipo multimetodo, multisistema y multidisciplinar que busca, mediante las diferentes pruebas aportadas desde los ambitos de la medicina y la psicologia, encontrar las inconsistencias que nos presenta el paciente. De las diferentes pruebas y los distintos profesionales se obtienen los datos convergentes que nos llevan al diagnostico de simulacion.
Circularly Polarized Omnidirectional Antenna with Dipole Core and Diagonally Adjoined Parasitic Braces for ISM Band Applications

This research proposes a circularly polarized (CP) single-fed omnidirectional dipole antenna operable in 2.45 GHz frequency for the industrial, scientific, and medical (ISM) radio band applications. The proposed antenna consisted of bisectional dipole core, a pair of quarter-wave baluns, and four diagonally adjoined parasitic braces. The bisectional dipole core was utilized to improve the antenna gain and realize omnidirectional radiation pattern, and the quarter-wave baluns were to symmetrize the current on the bisectional core. The four parasitic braces collectively generated circular polarization. In the study, simulations were conducted using CST Microwave Studio and a prototype antenna fabricated. To validate, experiments were carried out, and simulation and experimental results compared. The finding revealed good agreement between the simulation and experimental results. Essentially, in addition to achieving an antenna gain of 2.07 dBic, the proposed CP single-fed omnidirectional antenna is suited to ISM frequency band applications.
Quality assurance in European Higher Education: The role of student feedback for internal quality assurance in the Netherlands

This paper is investigating the role of student feedback for quality assurance at the course level at a Dutch university. Much of the already existing literature on student feedback is about its purpose only, and fails to recognize the importance of students and especially academic staff, who are at the core of the process and whose motivations and perceptions can heavily influence the effectiveness of student feedback. To explore the views and strategies of academics, a qualitative study has been chosen, including semi-structured interviews with members of academic staff teaching within the degree programme of Public Administration at the University of Twente. Their views have been compared to the satisfaction of students with several aspects of student feedback as stated in the Nationale Studenten Enquete from 2010 to 2013. From the findings of this paper, it can be concluded that student feedback is used for at least two purposes. On the one hand, it provides information to the lecturer and facilitates quality improvement. On the other hand, it is used for managerial purposes and serves external demands for quality assurance. Academics at the within Public Administration at the University of Twente have generally positive perceptions towards student feedback, although they see some small limitations. The results of student feedback are important indications for the strengths and weaknesses of courses and are used by academics to tackle problems concerning the quality of their courses. The student-satisfaction scores about the way in which their feedback is being used within Public Administration and with the way in which students are being informed about the results and outcomes of their feedback are sufficient, but suggest that there is still need for improvement. All in all, our findings underline the need for better communication of the purpose, results and outcomes of student feedback.
Comparative Analysis of Flux Reversal Permanent Magnet Machines With Toroidal and Concentrated Windings

In this article, the flux reversal permanent magnet (FRPM) machine with toroidal windings is presented and analyzed with reference to conventional concentrated windings. First, the influence of rotor pole numbers on FRPM machines with conventional concentrated windings is investigated. It is found that although the 12/13 stator slot/rotor pole FRPM machine has a high back electromotive force, the pitch factor, and magnet flux utilization ratio of concentrated windings are very low. By adopting toroidal windings instead of concentrated windings in the 12/13 FRPM machine, the pitch factor and resulted machine performance can be effectively improved. Finite-element analysis shows that the 12/13 FRPM machine with toroidal windings can produce 79% higher torque than its counterpart with concentrated windings. Then, the critical design parameters and detailed electromagnetic performance of FRPM machines with both winding types are analyzed and compared. It is shown that the machine with toroidal windings has higher torque, efficiency, power factor, and lower torque ripple, making it particularly suitable for low-speed, high-torque, and axial length limited applications. In addition, other feasible stator slot/rotor pole combinations to use toroidal winding are identified, with the aid of equivalent pole-pair number. Finally, two 12/13 FRPM prototypes with toroidal windings and concentrated windings are tested to validate the analyses.
Câncer de cólon: como diagnosticá-lo? Trabalho prospectivo

PURPOSE: Analyze the profile of colon and rectal cancer. METHODS: 390 colonoscopies were performed in 152 asymptomatic people Group A and 238 colon cancer patients with diagnosis done at colonoscopy Group B. Age, family history (FH), symptoms, Body Mass Index (BMI), location of the tumor and histopathology were analyzed. P value 0,95. 79 patients (31%) of cancer had positive FH and positive FH was present in 34 patients without cancer (23%) P>0,05.BMI was 26+/-4 Group A and 27+/- for B P>0,05 9 patients (5,9%) from Group A was found to have cancer. Superficial in 1 (11%) Group A against 21 (8,8%) for Group B P>0,05. Change of bowel habits with bleeding was 56 (60%) on the left colon cancer against 13 (31%) on the right P<0,01. Weight loss and anemia occurred more frequently on the right when compared to the left 30 (44%) X 31 (17%) and 36 (46%) X 15 (8%) P<0,01. 157 patients (63%) had symptoms for more than 6 months. Moderated-differentiated adenocarcinoma was found in 166 (67%), well-differentiated 63 (25%) and poorly-differentiated in 18 (7%) of the patients. CONCLUSION: The profile of CRC must be better studied.