Miracle-dz/UniFAR-FTUs huggingface dataset:
Analysis of Unidirectional Secondary Resonant Single Active Bridge DC–DC Converter

A compact and highly efficient unidirectional DC–DC converter is required as a battery charger for electrical vehicles, which will rapidly become widespread in the near future. The single active bridge (SAB) converter is proposed as a simple and high-frequency isolated unidirectional converter, which is comprised of an active H-bridge converter in the primary side, an isolated high frequency transformer, and a rectifying secondary diode bridge output circuit. This paper presents a novel, unidirectional, high-frequency isolated DC–DC converter called a Secondary Resonant Single Active Bridge (SR–SAB) DC–DC converter. The circuit topology of the SR–SAB converter is a resonant capacitor connected to each diode in parallel in order to construct the series resonant circuit in the secondary circuit. As a result, the SR–SAB converter achieves a higher total power factor at the high frequency transformer and a unity voltage conversion ratio under the unity transformer turns ratio. Small and nonsignificant overshoot values of current and voltage waveforms are observed. Soft-switching commutations of the primary H-bridge circuit and the soft recovery of secondary diode bridge are achieved. The operating philosophy and design method of the proposed converter are presented. Output power control using transformer frequency variation is proposed. The effectiveness of the SR–SAB converter was verified by experiments using a 1 kW, 48 VDC, and 20 kHz laboratory prototype.
4.1.2 Project‐driven adaptation of software life cycle model

Due to ever‐changing technology and business requirements, the inefficiency and ineffectiveness of traditional plan‐driven software development life cycle models are being questioned. Software engineers have to find ways of improving software development processes by applying more agile principles to the traditional plan‐driven approaches. This paper addresses this issue and suggests how project and technical management can apply principles from the agile group of life cycle models to alleviate some of the problems encountered. Project characteristics that can be used to evaluate individual projects to determine the degree to which the software life cycle can be adapted, are indicated. Practices are also proposed for adapting traditional plan‐driven life cycle processes that can benefit from more agile approaches.
Insanely Great: The Life and Times of Macintosh, the Computer that Changed Everything

From the Publisher: The Story Behind the Macintosh Computer INSANELY GREAT: THE LIFE & TIMES OF MACINTOSH covers the research and development that led to the first 128K Mac and the struggles involved to make the continued evolution of the Macintosh possible. Predecessors of the Mac and ideas that made their way into the first computer with a smiling start-up screen are discussed in loving detail (the author is a big fan of the Macintosh) -- the mouse, icons and other discoveries that revolutionized the way people work with computers. Along the way, the reader gets a sense of the people who contributed to the various Macintosh teams: Steve Jobs, with his "reality-distortion field" that prodded the team to create the near-impossible; John Sculley, the former Pepsi CEO brought in to facilitate the growing up of the Apple company; and many other key members of the Macintosh teams including Bill Atkinson, the genius behind MacPaint and later, HyperCard. As it turns out, Bill Atkinson did not originally plan for a menu bar on top of the screen. It sort of migrated upward, like cream rising to the top. Atkinson wanted the commands to be geographically predictable, the same place in every application. For that reason, he rejected pop-up windows [as had been used in Xerox's PARC computers]. Then he got the idea of a menu bar -- a constant presence from which one could evoke a menu of commands by pointing and clicking. At first he put the bar at the bottom of the active window, then after some testing moved it to the top. But putting the menu bar on top of a window presented a problem: when the user shrank the size of the window, you couldn't get the headings to fit. (Microsoft's Windows uses this approach, and suffers by it.) So finally, at [user-testing fanatic Larry] Tesler's urging, he moved it to the top of the screen. Users quickly learned where the commands were under the individual headings. Atkinson was impressed that they could implicitly visualize where a command might "live" on the screen, moving the mouse over the heading, dropping down the menu and going right to the location in one fell swoop. It was a case of totally internalizing the illusion of geography in cyberspace -- you would "go" to a menu choice that didn't really exist until you created it. Steven Levy's INSANELY GREAT isn't only the chronicle of a single machine; it's a chapter in the story of the personal computer's ongoing evolution. Readers who may have never used a computer without icons or a trash can (or Recycle Bin) may want to learn how the Macintosh made the computers and operating systems that followed its introduction were made possible.
Transient signal detection using the empirical mode decomposition

In this paper, we report on efforts to develop signal processing methods appropriate for the detection of man-made electromagnetic signals in the nonlinear and nonstationary underwater electromagnetic noise environment of the littoral. Using recent advances in time series analysis methods [Huang et al., 1998], we present new techniques for detection and compare their effectiveness with conventional signal processing methods, using experimental data from recent field experiments. These techniques are based on an empirical mode decomposition which is used to isolate signals to be detected from noise without a priori assumptions. The decomposition generates a physically motivated basis for the data.
A 3D State Space Formulation of a Navigation Kalman Filter for Autonomous Vehicles

Abstract : The Kalman Filter has many applications in mobile robotics ranging from perception, to position estimation, to control. This report formulates a navigation Kalman Filter. That is, one which estimates the position of autonomous vehicles. The filter is developed according-to the state space formulation of Kalman's original papers. The state space formulation is particularly appropriate for the problem of vehicle position estimation. This filter formulation is fairly general. This generality is possible because the problem has been addressed
Modélisation du comportement cyclique et de la durée de vie d'aciers à outils martensitiques

This work is a contribution to the description of the behavior and the assessment of the fatigue life of hot work tool steels.For that purpose, a methodology was implemented involving two complementary parts that are the investigation of behaviorand lifetime models adapted to tempered martensitic steels. The cyclic behavior of X38CrMoV5 (47HCR) and 55NiCrMoV7 (42HCR) steels was studied under various load and temperature conditions. The influence of the strain rate and strain amplitude, of the dwell times within cycles as well as ratcheting or plastic accommodation effects for stress controlled tests, were taken into account in the modeling. Two models (ONERA, 2M1C) formulated in the framework of the irreversible processes of thermodynamics were considered. After their presentation, they were identified successfully by complexity level growing, according to the kind of loads taken into account. Compared with ONERA model, 2M1C model allows a better description both of strain controlled and stress controlled stress tests. Moreover, the two different mechanisms included in the model were related to the microstructural evolutions (dislocations and carbides) identified in low cycle fatigue. Two validations were performed providing interesting results: the first one, in an isothermal case, performed on different notched specimens under displacement controlled tests, the second one, in a non-isothermal case, related to thermal fatigue tests carried out in a co-operative project with the KARLSTAD university (Sweden). Fatigue life investigation of X38CrMoV5 steel was addressed in a second part. In order to cover the loading conditions of the hot forming processes, LCF tests were carried out to complete an existing database. The initiation and propagation mechanisms induced by fatigue relaxation test at the temperature of 560°C were investigaded. A non isothermal continuum damage model (ONERA) was identified. Analysis of experimental results do not reveal time dependant damage mechanisms, so only a fatigue damage component was activated in the model. The last part of this work relates to the lifetime model validation. The predictions provided by the model were compared with the number of cycles to failure resulting from LCF and TMF tests obtained in a previous work.
Relationship between single-event upset immunity and fabrication processes of recent memories

Single-Event Upset (SEU) immunity for commercial devices were evaluated by irradiation tests using high-energy heavy ions. We show test results and describe the relationship between observed SEU rate and structures/fabrication processes. In this experiment, single-ion Multiple-Bit Upsets (MBUs) in 4 Mbit SRAM, 16 Mbit DRAM and 64 Mbit DRAM were observed. These MBUs were also discussed.
Inertial tracking for mobile augmented reality

Augmented Reality applications require the tracking of moving objects in real-time. Tracking is defined as the measurement of object position and orientation in a scene coordinate system. We present a new combination of silicon micromachined accelerometers and gyroscopes which have been assembled into a six degree of freedom (6 DoF) inertial tracking system. This inertial tracker is used in combination with a vision-based tracking system which will enable us to build affordable, light-weight, fully mobile tracking systems for Augmented Reality applications in the future.
Lifetime and energy optimization in multi‐hop wireless sensor networks with spatial modulation based cooperative MIMO

In this letter, the optimizations of both lifetime and energy consumption are jointly considered in multi‐hop clustered wireless sensor networks (WSNs), where spatial modulation (SM)‐based cooperative MIMO (CMIMO‐SM) is utilized as the transmission scheme. In this scheme, an only‐forwarding transmission scenario is considered so that the intermediate clusters only act as deliverers to pass the data from the source to the destination. The energy consumption and lifetime of the whole network are optimized by allocating the hop lengths and selecting the appropriate number of hops. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Large-Scale Intelligent Transportation System Traffic Detector Data Archiving

Archived traffic data can be used in transportation planning, administration, and research by various entities and agencies. During the past two decades, considerable effort has been dedicated to developing and implementing large-scale traffic data archives. The Wisconsin Traffic Operation and Safety (TOPS) Laboratory at the University of Wisconsin–Madison maintains a statewide traffic detector data archiving and retrieving system, which is developed to enable centralized management of statewide ITS detector and configuration data, optimizing the utilization of massive data on a systematic level, and improving the interactivity and accessibility for integration with other transportation data sources such as lane closure data or incident data. This data archive is currently being enhanced to incorporate higher resolution traffic data by migrating from 5-minute to 1-minute and even 20-second sampling intervals. At the same time, there is a desire to generate aggregated datasets such as hourly, monthly, and annual average values from the raw data. As the traffic data requirements continue to grow, the management of the traffic data archive becomes a complex big data problem. This paper describes a proposed redesign of the TOPS Lab traffic detector archived data management system to improve storage, performance, access, and integration capabilities. Particular detail is given to the data archiving process, including data validation, and support for spatial attributes and GIS data integration.
Direct torque control with the application of a predictive pulse width control

The direct torque control (DTC) method selects the most suitable stator voltage space vector on the basis of the actual flux and torque values with respect to their reference values. In a digital control system, this voltage space vector will be applied for the whole sampling period, and therefore the stator flux could cross its boundary too far. In order to avoid this problem, the proposed method calculates on the hand of the stator equation the pulse width of the voltage space vector, which is exactly needed to reach the flux boundary. The predictive pulse width control (DTC-PPWC) scheme can be considered as a simple extension of the classic DTC algorithm and has been validated by simulations and experiments, showing excellent results. Furthermore, the advantages of the DTC, i.e. low switching losses and its simple implementation, are only slightly violated.
histone demethylase

There are two classes of enzymes involved in histone methylation: methyltransferases and demethylases. While methyltransferases are responsible for establishing methylation patterns, demethylases are capable of removing methyl groups not only from histones but other proteins as well. Histone demethylases not only target methylated sites on histone tails but also interact with methylated sites on non-histone proteins, such as p53.
Knowledge-based optimisation of three-dimensional city models for car navigation devices

Three-dimensional maps are deemed better for navigation purposes as they offer a larger number and more realistic navigation cues than two-dimensional maps. Improvements in two key technologies have opened the doors towards utilization of 3D maps for car navigation devices. Advances in data acquisition technologies and data processing methods have made creating photorealistic three-dimensional city models cheaper and to a large extent automatic, while advances in mobile technologies have made e.g. modern smartphones powerful enough to visualize photorealistic 3D graphics. Despite the latter improvements, making three-dimensional mobile maps remains a challenge due to the large amounts of data and the device’s limited amount of memory and pro- cessing power. These limitations can be overcome by intelligently reducing the amount of information that is handled and displayed by the device. This thesis presents an information reduction and prototyping framework that reduces the amount of information contained in city models so a to enable their loading and display on car navigation devices. The information reduction method consists of two steps. The first step selects buildings that are close to the driver’s route with the idea that these aid the driver in navigating. Buildings that are far from the route are discarded. In the second step, the selected buildings’ external representation is adapted to match their navigational value that is based on their thematic, semantic and cognitive properties. For instance, a building of type ’restaurant’ and ’brand’ McDonald’s offers more navigational cues than a block of gray, anonymous residential buildings. The latter are styled in generic textures whereas the former is styled in photorealistic textures. The relations between a building’s semantic and thematic properties and its external representation are captured in visualisation rules. A prototype is built that implements the designed information reduction methods and tests their effectivity. The selection step is performed using a spatial database while the visualisation rules are processed by an expert system. The reduced 3D scenes are displayed in a game engine that also performs performance measurements. The obtained results are conclusive: the performance of a visualisaion in terms of frame rate and used graphics memory is governed by the the amount of textures, much more so than the number of geometries. Effort should therefore be directed towards the reduction and/or simplification of textures rather than geometries.
Analysis of Credit Sales Policy to Minimize Uncollectible Receivable Risk at Bali Niksoma Boutique Beach Resort in Legian

The purpose of this study is to find out and analyze credit sales policies and to find out how much the allowance for receivable losses should be established at Bali Niksoma Boutique Beach Resort. This research uses qualitative data in the form of Standard Operating Procedures (SOP) and quantitative data in the form of aging schedules and sales data. The analytical tool used in the research is 5C analysis to analyze the crediting standards, credit sales policies using the checklist analysis method to analyze compliance with the credit sales policies, and the reserve method for calculating receivable losses. The results showed that the implementation of credit sales policies had not been carried out optimally, management of Bali Niksoma Boutique Beach Resort has implemented its credit policy, but there are still several policies that have not been implemented properly according to set standards. This can be seen throught the result of the checklist analysis that have been carried out. Meanwhile, for the credit standard, the management has not implemented the 5C principle maximally. The amount of bad debts is classified as high, so it is necessary to establish a reserve allowance for bad debts to minimize the risk of uncollectible accounts.
Ant Colony Optimisation for Continuous and Mixed-Variable Domains

Ant colony optimization (ACO) has become one of the popular metaheuristics used for tackling optimisation problems. Its popularity grows steadily, and the area of applications constantly widens. Recent research shows that ACO is competitive and applicable to various real-world optimisation problems. ACO has been initially developed to handle only the discrete optimisation problems. In this work, we present a way to extend ACO, so that it can also be applied to both continuous and mixed-variable optimisation problems. We initially focus only on the continuous case. Following an extensive analysis of the performance of ACO extended to continuous domains, we present how it may be further adapted to handle both continuous and discrete variables simultaneously. We thus introduce the first native mixed-variable version of an ACO algorithm. The book is recommended for all those interested in novel approaches to heuristic optimisation and ways to practically tackle difficult optimisation problems. The ideas described are tested on real-world example problems, which allows better understanding and demonstrates the advantages of the approach.
Embedded ultrasonic sensors for monitoring structural integrity

The in situ monitoring of structural integrity in large structures requires a substantial number of sensors. This presents problems especially due to the complexity of their electrical connections. This paper describes a monitoring system based on embedded ultrasonic sensors, which are interfaced using a license-exempt telemetry band to a remote data acquisition system. The sensors themselves are designed for the inspection of carbon fiber composite plates and involve the embedding of piezoelectric and piezocomposite components as well as acoustic fiber waveguides.
Smartphone OS and User Emotion and Ethics

: In the light of Gosling theory, we want to answer the question of whether the moral and emotional characteristics (as their Identity Claims and Emotional Regulation) of different smartphones platforms users differ. For this purpose we conducted two researches on a sample of 1500 Serbian students. The obtained results point to the fact that there are statistically significant differences in morality of users of different OS (other socio demographic variables have no significant influence on our dependent variables). Moral characteristics were operationally defined with the Moral Foundations Theory by Haidt. In the second research 809 subjects completed the PANAS X questionnaire. Significant discrete emotions and mood differences were found among different smartphone OS users.
The Role of Commitment Amongst Tourists and Intelligent Virtual Assistants

Abstract This paper aims to analyze Attachment and Emotional Values as antecedents of Commitment to intelligent virtual assistants (IVA) and Commitment as a driver of Loyalty Intentions toward the IVA. Data is collected from a sample of 124 active users of IVA systems in tourism settings by the mean of an online survey. The findings contribute to the existing literature by revealing that Attachment and Emotional Values positively influence tourists Commitment to Intelligent Virtual Assistants. Moreover, findings reveal that Commitment positively influences Loyalty Intentions. This study is a first attempt to analyzing the commitment process between users (i.e., tourists) and artificial intelligent systems (i.e., intelligent virtual assistants).
Discriminative Validity of the Lower and Upper Quarter Y Balance Test Performance in Healthy Youth

Background: The Lower (YBT-LQ) and Upper (YBT-UQ) Quarter Y Balance Test have been widely used for the assessment of dynamic balance and shoulder mobility/stability, respectively. However, investigations on the validity of the two tests in youth are lacking. Therefore, we performed two studies to determine discriminative validity of the YBT-LQ (study 1) and the YBT-UQ (study 2) in healthy youth.Methods: Sixty-nine male soccer players (age: 14.4 ± 1.9 yrs) and 69 age-matched untrained male subjects (14.3 ± 1.6 yrs) participated in study 1 and 37 young swimmers (age: 12.3 ± 2.1 yrs) as well as 37 age-/sex-matched individuals (age: 12.5 ± 2.0 yrs) took part in study 2. Normalized maximal reach distances per reach direction and the composite score of the YBT-LQ/UQ were used as outcome measures. One-way analysis of variance and the receiver operator characteristic curve analysis (i.e., calculating the area under the curve [AUC]) were conducted to assess discriminative validity.Results: Youth athletes showed significantly better YBT-LQ (study 1: p < 0.001, d = 0.86-1.21) and YBT-UQ (study 2: p < 0.001, d = 0.88-1.48) test performances compared to age- and sex-matched untrained subjects. Further, AUC-values indicated a chance of ≥74% (YBT-LQ) and ≥71% (YBT-UQ) to discriminate between youth athletes and controls.Conclusions: In healthy youth, the YBT-LQ and the YBT-UQ seem to be valid test instruments for the discriminative assessment of dynamic balance and shoulder mobility/stability, respectively.