Miracle-dz/UniFAR-FTUs huggingface dataset:
Deductive Verification via Ghost Debugging

We present a verification approach based on auxiliary programs, which we call ghost debuggers. This approach leads to notable verification gains when the structure of the program does not match the execution structure, notably when that latter structure is recursive. We present a theoretical foundation of our approach over a flavor of transfinite games, which let us specify and prove fine-grained properties about infinite behaviors of programs. By making use of the game structure, we also show that our approach can be applied to relational properties like simulation between programs. Our approach is backed by a mechanized development in the Why3 tool, which formally proves sound the Hoare-style logic backbone of our approach.
Cybersecurity for Android Applications: Permissions in Android 5 and 6

ABSTRACT Android 5 informs users of all permissions requested when downloading an app and gives users an all-or-nothing acceptance decision to make for the permissions. In contrast, Android 6 informs users of each permission upon first use of the downloaded app. We conducted an online study with participants recruited through Amazon Mechanical Turk to compare the relative usability of the two permissions interfaces. Each interface condition contained a simulation of the Google Play Store and instructed participants to role-play the task of downloading an app. Afterward, each participant was questioned about which permissions were seen and the functions of those permissions. The Android 5 interface showed better performance with informing users as to which permissions access their device, whereas the Android 6 interface fared better with presenting the functions of the permissions. Also, the Android 6 interface was found to be more intuitive to use than that of Android 5. Although a pilot study showed that users favored the Android 6 permissions interface over Android 5’s, the present study found no clear evidence that it was more effective than Android 5.
Difference in the statistics of game between the winning and losing teams of the king's cup 2008 of male handball

The purpose of this study is to analyze the difference between the winning and losing teams of the King’s Cup 08 of male handball depending on the statistics of game. The data was provided by the ASOBAL (n = 7). The variables used in the study were divided in two kind of variables: primary (goals scored, goals of 9, 6, 7 m. and counterattack, failed launch of 9, 6, 7 m. and counterattack, total launches, passes of goal, losses, recoveries, stops of 9, 6, 7m., counterattack, and total stops, exclusions, direct disqualifications and expulsions) and secondary (Possessions, COE, COR, CDE, CDR). All data in the game statistics were normalized to 100 possessions. The analysis was performed using SPSS 17.0 for Windows, using a t-test for independent measures through which we can see that the winning teams differ from losing teams in the following variables: goals scored (t100 =2.907; p≤ 0.05), failed launch of 6 m. (t100 = - 3.335; p≤ 0.01), goals counterattack (t100 =2.196; p≤ 0.05), stops 6m (t100 = 2.406; p≤ 0.05), COE (t100 = 2.907; p≤ 0.05), COR (t100 = 3.826; p≤ 0.01), CDE (t100 = -2.907; p≤ 0.05), CDR (t100 = 3.826; p≤ 0.01). We conclude that both the defensive and counterattacks phase are extremely important aspects for success, this fact must be taken into account by the coaches and trainers when they are developing their training process.
Post-Silicon Analysis of Shielded Interconnect Delays for Useful Skew Clock Design

Analyses and simulations have shown that interconnect shielding can replace a large fraction of the delay buffers used to achieve timing goals through a useful skew clock design methodology. Immunity from process, operation, and environmental variations in nanoscale CMOS technology clock designs are essential, thus making predictable delays and useful skews highly important. We examine interconnect shielding intradie within-die (WID) and interdie die-to-die (D2D) variations under a wide variety of ( ${P}, {V}, {T}$ ) corners, and show their applicability and ability to achieve clock design timing goals. The analysis is based on post-silicon measurements of a novel shielded interconnect ring oscillator in a 16-nm test chip supported by a rigorous provable estimation methodology.
Exploring aerial perching and grasping with dual symmetric manipulators and compliant end-effectors

Inspired by talon of a predator bird, this paper presents a quadrotor with two 2- Degree of Freedoms (DOFs) compliant manipulators which could mimic bird perching and grasping. The symmetric configuration of the manipulators causes minimum shift in center of gravity and a minimum disturbance to the angular momentum of the platform during grasping and perching maneuvers. Thus, the dynamics of the manipulator is independent to that of the platform. Moreover, a compliant end-effector is introduced to decouple the dynamics of the unmanned aerial vehicles from the force interaction with the environment or target objects. Therefore, aerial manipulation problem is significantly simplified due to the minimum amount of disturbance among components. In addition, the manipulators could function as the landing gear, which allows larger work envelope, weight saving and less landing impact. It also has the potential to achieve a bird-like “perch and watch” to increase the endurance of unmanned aerial vehicles in missions that involve extended endurance.
Analysis of the frequency conversion of spurious tones in frequency dividers and development of an event-driven model for system simulations

Abstract. This paper presents a frequency domain analysis of spurious tones in frequency dividers. The results of the analysis are used to develop an event-driven model for system simulations which work entirely in the frequency domain. The proposed approach is able to provide a fast and accurate model in a SystemVerilog/C++ environment which takes the frequency conversion effects of the spurious tones into account. A virtual prototype which includes the model was simulated and due to the fast simulation speed it was possible to determine the influence of spurious tones on the bit error rate in a complex receive scenario.
Queering BIM

The use of building information modeling (BIM) for architectural design assumes precision and coordination of data. Outcomes prioritize constructability, assigning a stereotypically “straight” perspective to its high degree of building likelihood. Queering BIM is an applied method that challenges the normalization of BIM's default “family” objects. By shifting the focus of digital content development (on this often-imposed platform), a more socially responsible and equitable strategy promotes work with design specificity and collaboration potential.
Consumo residencial: uma proposta de modelo de negócio para medidores inteligentes

São verificadas diversas iniciativas, tanto em empreendimentos como na literatura, para o desenvolvimento de produtos inteligentes voltados a aplicações residenciais, principalmente relacionados ao monitoramento e controle de consumo de energia por meio de medidores inteligentes. O uso de medidores inteligentes tem ganhado espaço em diversos países, porém verifica-se que este tipo de aplicação ainda é muito incipiente no Brasil, resultando em altos custos para as concessionárias na realização de coleta de dados de consumo no país. As pesquisas na literatura sobre medidores inteligentes apresentam principalmente foco em aspectos tecnológicos e engenharia de produto, o que resulta em uma lacuna em relação aos aspectos gerenciais e valor ao cliente. Dessa forma, este trabalho tem como objetivo desenvolver uma proposta de modelo de negócio com arranjo flexível voltada ao desenvolvimento e oferta de serviços associado aos medidores inteligentes (água e/ou energia e/ou gás) para uso doméstico. Para tanto, foram utilizadas diversas fontes de evidência a fim de se levantar dados para o desenvolvimento do modelo. Foi possível observar que, de fato, as fontes de evidência da literatura e os casos identificados apresentam foco nos aspectos tecnológicos e estrutura do produto. Os resultados apresentam uma síntese de diversas possibilidades de configuração de modelos de negócio para medidores inteligentes residenciais. A partir disso, este resultado permite estimular o desenvolvimento de negócios para o controle e fomento do consumo consciente de recursos naturais, tais como água, energia e gás, tão estratégicos e críticos para a manutenção do meio ambiente.
Zero-Phase-Angle Controlled Bidirectional Wireless EV Charging Systems for Large Coil Misalignments

Misalignment between charging coils is an unavoidable problem in all electric vehicle (EV) charging systems that are based on wireless power transfer (WPT) technology. This is because variations in both self- and mutual inductances of charging coils due to coil misalignments significantly affect the charging rate and efficiency of the EV charger. As a solution, this article proposes a new control technique that maintains the rated charging power level at optimum efficiency in spite of large coil misalignments. To compensate for the variations in inductances, the technique uses the information extracted from input impedance to operate the system essentially at unique converter voltages with zero phase angle, ensuring that charging will take place at rated power with optimal efficiency despite any pad misalignments. The article presents a comprehensive mathematical model, describing the theoretical basis of the proposed control philosophy. To demonstrate the validity of the proposed control concept, a 1-kW bidirectional WPT EV charging system is built and results are presented under misaligned coil conditions. Results convincingly indicate that the proposed controller is efficient and capable of maintaining the rated charging rate despite large coil misalignments and without any dedicated wireless communication.
Active Camera Relocalization from a Single Reference Image without Hand-Eye Calibration

This paper studies active relocalization of 6D camera pose from a single reference image, a new and challenging problem in computer vision and robotics. Straightforward active camera relocalization (ACR) is a tricky and expensive task that requires elaborate hand-eye calibration on precision robotic platforms. In this paper, we show that high-quality camera relocalization can be achieved in an active and much easier way. We propose a hand-eye calibration free approach to actively relocating the camera to the same 6D pose that produces the input reference image. We theoretically prove that, given bounded unknown hand-eye pose displacement, this approach is able to rapidly reduce both 3D relative rotational and translational pose between current camera and the reference one to an identical matrix and a zero vector, respectively. Based on these findings, we develop an effective ACR algorithm with fast convergence rate, reliable accuracy and robustness. Extensive experiments validate the effectiveness and feasibility of our approach on both laboratory tests and challenging real-world applications in fine-grained change monitoring of cultural heritages.
Dual-Mode Resonator for Simultaneous Permittivity and Thickness Measurement of Dielectrics

This paper presents a microwave sensor for simultaneous measurement of permittivity and thickness in dielectric materials. The sensor is made of a dual-mode magnetic-<inline-formula> <tex-math notation="LaTeX">$LC$ </tex-math></inline-formula> resonator coupled to a microstrip transmission line. Due to a dual-mode resonance of the magnetic-<inline-formula> <tex-math notation="LaTeX">$LC$ </tex-math></inline-formula> resonator, the transmission response of the sensor shows two zero frequencies. By applying dielectric materials of various permittivities and thicknesses to the resonator, both of the transmission zero frequencies are modified. The alterations of the two transmission zero frequencies are used to characterize the permittivity and thickness of the dielectric samples under test. A prototype of the sensor is fabricated and measured for verifying the proposed sensing principle.
Performance and Emission Parameters of Homogeneous Charge Compression Ignition (HCCI) Engine: A Review

Strict emission regulations and demand for better fuel economy are driving forces for finding advanced engines that will be able to replace the conventional internal combustion engines in the near future. Homogeneous charge compression ignition (HCCI) engines use a different combustion technique; there are no spark plugs or injectors to assist the combustion. Instead, when the mixtures reach chemical activation energy, combustion auto-ignites in multiple spots. The main objective of this review paper is to study the engine performance and emission characteristics of HCCI engines operating in various conditions. Additionally, the impact of different fuels and additives on HCCI engine performance is also evaluated. The study also introduces a potential guideline to improve engine performance and emission characteristics. Compared to conventional compression ignition and spark ignition combustion methods, the HCCI combustion mode is noticeably faster and also provides better thermal efficiency. Although a wide range of fuels including alternative and renewable fuels can be used in the HCCI mode, there are some limitation/challenges, such as combustion limited operating range, phase control, high level of noise, cold start, preparation of homogeneous charge, etc. In conclusion, the HCCI combustion mode can be achieved in existing spark ignition (SI) engines with minor adjustments, and it results in lower oxides of nitrogen (NOx) and soot emissions, with practically a similar performance as that of SI combustion. Further improvements are required to permit extensive use of the HCCI mode in future.
Two-Phase, Dual Interleaved Buck–Boost DC–DC Converter for Automotive Applications

A two-phase buck–boost converter utilizing dual interleaving is presented in this article. The dual interleaving consists of an interphase transformer (IPT) that doubles the ripple frequency together with two conventional buck–boost switching arms, mitigating the inductor ripple current and aiding to increase the power density of the converter. A description of the design and selection of the power devices is presented for a 32-kW, 75-kHz dual interleaved SiC prototype with an IPT, such that a power density of 7.4 kW/kg is achieved. The operation of the circuit is verified experimentally using a prototype with 315–385 V supply range and 350-V output voltage, achieving 97.1% peak efficiency at 32 kW. The experiments reveal that the interleaved coupled currents are equalized without an active balancer.
A Systematic Review of E-Books in Academic Libraries: Access, Advantages, and Usage

Abstract This article presents a systematic review of E-book user studies from 2001 to 2017. It focused on qualitative and quantitative studies that examined academic user groups’ attitudes and interactions with E-books. The review aimed to reveal users’ knowledge of the E-book format, their ability to define an E-book, their awareness of E-books’ availabilities from the institutions’ libraries, as well as their appreciation of E-books’ advantages. The authors also considered respondents’ usage of E-books such as the devices that fostered E-book access, internet avenues individuals’ utilized to locate the materials, printing and downloading of E-books, and the time individuals’ spent reading E-books online and the frequency of their access. The literature illustrated the importance of E-books to all members of the academic community for research and coursework. Still, studies pointed to a lack of awareness or familiarity among students, faculty, and staff of their institution’s E-books especially with the format’s features and the various collections owned by the university. To that end, it is especially critical that librarians promote E-books to all potential users.
Drag characteristics of V-groove and transverse curvature riblets

The paper examines the drag characteristics of longitudinally ribbed surfaces where the rib dimensions are the order of the initial turbulent wall burst region near the wall. Direct drag measurements are presented for symmetric and unsymmetric V-groove, and (larger wavelength) transverse curvature riblets. The direct drag data indicate net drag reductions as large as 7% for certain V-groove riblets with heights in terms of law of the wall coordinates h+ less than 30. For one of the riblet models, the drag reduction is confirmed by reductions in the momentum thickness, turbulent velocity fluctuations, and Reynolds stress profiles. Although the direct drag data for the transverse curvature riblets showed drag increases, certain models did show that the drag increase diminished with increasing velocity. This trend is opposite to the normal one found for rough surfaces and should be investigated further.
Unknown External Force Estimation and Collision Detection for a Cooperative Robot

SUMMARY In human–robot cooperative industrial manipulators, safety issues are crucial. To control force safely, contact force information is necessary. Since force/torque sensors are expensive and hard to integrate into the robot design, estimation methods are used to estimate external forces. In this paper, the goal is to estimate external forces acting on the end-effector of the robot. The forces at the task space affect the joint space torques. Therefore, by employing an observer to estimate the torques, the task space forces can be obtained. To accomplish this, loadcells are employed to compute the net torques at the joints. The considered observers are extended Kalman filter (EKF) and nonlinear disturbance observer (NDOB). Utilizing the computed torque obtained based on the loadcells measurements and the observer, the estimates of external torques applied on the robot end-effector can be achieved. Moreover, to improve the degree of safety, an algorithm is proposed to distinguish between intentional contact force from an operator and accidental collisions. The proposed algorithms are demonstrated on a robot, namely WallMoBot, which is designed to help the operator to install heavy glass panels. Simulation results and preliminary experimental results are presented to demonstrate the effectiveness of the proposed methods in estimating the joint space torques generated by the external forces applied to the WallMoBot end-effector and to distinguish between the user-input force and accidental collisions.
A new single‐phase cascaded multilevel inverter topology with reduced number of switches and voltage stress

Int Trans Electr Energ Syst. 2019;e12191. https://doi.org/10.1002/2050-7038.12191 Summary Multilevel inverters have been the vital component for the power electronic systems and have been researched extensively to further enhance their performances in terms of topology and their control. In this paper, a new bidirectional single‐phase multilevel inverter module has been proposed with a reduced number of switches along with lower voltage stresses. The proposed module generates 17 levels at the output with 10 unidirectional switches along with four dc voltage sources with two varieties of dc voltage sources. Moreover, for a higher number of levels, the cascade connection of several modules has been discussed in this paper with three different methods for the selection of dc voltage sources. The proposed module has been compared with several similar topologies, which set the benchmark of the proposed one. The operation and performance of the proposed module have been validated through several simulation and experimental results with different types of load considering a change of modulation index.
Sustainability in Interior Design: Interdisciplinary Research Used for Exploring Relation between Built Environment and Human

This paper presents achievements and results in the projects based on the Platform of BCDlab (Body Conscious Design laboratory) and the Institute of Interior and exhibition design of Faculty of Architecture, related to sustainability. The studies are related to the collection of 11 features of a supportive environment for the contemporary human – “cultural animal”. These postulated have been generated during the last years of the research or relation between the human and its natural and built environment in BCDlab. Each postulate is illustrated with some of its design outputs. The presence or lack of the supportive environment has an impact on the contemporary behaviour, well-being, social and interpersonal interactions and in a long-term interaction also on the personal and environmental integrity, belonging to the community and local culture and especially to the public health. There is also an evidence of interrelation to the sustainability approach, the paper presence studies that are emphasising the importance of the material choice by the spatial design, the role of local growth materials in its authentic and truthful form and surface.
Deep learning for enhancing wavefield image quality in fast non-contact inspections

Ultrasonic wavefield imaging with a non-contact technology can provide detailed information about the health status of an inspected structure. However, high spatial resolution, often necessary for accurate damage quantification, typically demands a long scanning time. In this work, we investigate a novel methodology to acquire high-resolution wavefields with a reduced number of measurement points to minimize the acquisition time. Such methodology is based on the combination of compressive sensing and convolutional neural networks to recover high spatial frequency information from low-resolution images. A data set was built from 652 wavefield images acquired with a laser Doppler vibrometer describing guided ultrasonic wave propagation in eight different structures, with and without various simulated defects. Out of those 652 images, 326 cases without defect and 326 cases with defect were used as a training database for the convolutional neural network. In addition, 273 wavefield images were used as a testing database to validate the proposed methodology. For quantitative evaluation, two image quality metrics were calculated and compared to those achieved with different recovery methods or by training the convolutional neural network with non-wavefield images data set. The results demonstrate the capability of the technique for enhancing image resolution and quality, as well as similarity to the wavefield acquired on the full high-resolution grid of scan points, while reducing the number of measurement points down to 10% of the number of scan points for a full grid.