Search results for "testing."

Unilateral Maximal Isometric Hex Bar Pull Test: Within-Session Reliability and Lower Body Force Production in Male and Female Freeski Athletes

2021

The aim of the study was to (1) assess the within-session reliability of a unilateral isometric hex bar pull (UIHBP) maximal voluntary contraction (MVC) test and, (2) determine unilateral isometric absolute peak force (PFabs) and relative peak force (PF) values in freeski athletes. Twenty-one male and eight female academy to national team freeskiers performed the novel UIHBP MVC task on a force plate and PFabs and relative PF were assessed (1000 Hz). Within-session measures of PFabs offered high reliability on left and right limbs for males (ICC = 0.91–0.94, CV = 2.6–2.2%) and females (ICC = 0.94–0.94, CV = 1.4–1.6%), while relative PF measures showed good to high reliability in both left a…

A case study on the evaluation of friction stir welds by ultrasonic inspection technique

2015

Friction stir welding (FSW) is an innovative process that has been successfully used in joining aluminum alloys, normally difficult to weld. Important advantages over fusion welding are better retention of baseline material properties, lower residual stresses and excellent mechanical properties. Defects that occur in FSW joints are due to improper tooling or setup. Non-destructive techniques used to inspect FSW joints are X-rays, eddy current, conventional ultrasonic testing and dye penetrant proper only for surface breaking defects. Currently there is no non-destructive technique that can guarantee absence of flaws in friction welds during manufacturing. In this work, non-destructive remot…

Tailoring the excitation of fundamental flexural guide waves in coated bone by phase-delayed array: Two-dimensional simulations

2015

The fundamental flexural guided wave (FFGW) enables ultrasonic assessment of cortical bone thickness. In vivo, it is challenging to detect this mode, as its power ratio with respect to disturbing ultrasound is reduced by soft tissue covering the bone. A phase-delayed ultrasound source is proposed to tailor the FFGW excitation in order to improve its power ratio. This situation is analyzed by 2D finite-element simulations. The soft tissue coating (7-mm thick) was simulated as a fluid covering an elastic plate (bone, 2–6 mm thick). A six-element array of emitters on top of the coating was excited by 50-kHz tone bursts so that each emitter was appropriately delayed from the previous one. Respo…

Nejaušdatu testēšana tīmekļa lietotņu saskarnēm

2021

Visaptveroša testēšana ir kritisks solis programmatūras kvalitātes nodrošināšanā. Tīmekļa lietotnēs, līdzās vienības testiem, tiek izmantoti automatizēti un manuāli sistēmas testi. Šo testu rakstīšana un izpilde prasa nozīmīgus resursus. Nejaušdatu testēšana(fuzz testing) piedāvā risinājumus automatizētai testpiemēru ģenerācijai, bet šo metožu pielietojums tīmekļa saskarņu testēšanā ir maz pētīts. Darbā tiek pētītas iespējas un grūtības nejaušdatu testēšanas metožu izmantošanā tīmekļa lietotņu nejaušdatu testēšanā. Ir piedāvātas pieejas un algoritmi nejaušināmas tīmekļa saskarnes reprezentācijas izgūšanai, testpiemēru ģenerācijai un rezultātu novērtēšanai. Tāpat tiek apspriesti šo metožu iz…

Guided Wave Techniques for Damage Detection in Composite Aerospace Structures

2018

Composite materials make up an increasing portion of today’s aerospace structures (see, e.g. Boeing 787 and Airbus 380). These aircrafts’ fuselage, for example, is composed of a laminated composite skin connected to composite stringers and C-frames. Of primary importance is the detection of damage in these built-up structures, whether caused by the manufacturing process or in service (e.g. impacts). A related issue is the characterization of the composite (visco)elastic mechanical properties, that can also be related to the quantification of potential damage. Guided elastic waves propagating in the ~100s kHz regime lend themselves to provide the necessary sensitivity to these two conditions…

Modeling and Mitigating Errors in Belief Propagation for Distributed Detection

2021

We study the behavior of the belief-propagation (BP) algorithm affected by erroneous data exchange in a wireless sensor network (WSN). The WSN conducts a distributed multidimensional hypothesis test over binary random variables. The joint statistical behavior of the sensor observations is modeled by a Markov random field whose parameters are used to build the BP messages exchanged between the sensing nodes. Through linearization of the BP message-update rule, we analyze the behavior of the resulting erroneous decision variables and derive closed-form relationships that describe the impact of stochastic errors on the performance of the BP algorithm. We then develop a decentralized distribute…

Kielitutkinnot ja muu laajamittainen kielitaidon arviointi Suomessa

2016

This paper describes the development, current state and expected future development of the assessment systems that most of the papers in the present volume cover. Our focus is on the systems serving general education, particularly the Matriculation Examination and national evaluations of educational achievement in languages, as well as the National Certificates of Proficiency aimed at adult language learners. We describe how changes in our understanding of what language proficiency is have affected these assessment systems and discuss the impact that some of them have been expected to have and what is known about that impact. We also discuss how the Common European Framework of Reference ha…

An approach to hypothesis testing based on local indicators of spatio-temporal association

The detection of clustering structure in a point pattern is one of the major focus of attention in spatio-temporal data mining. For instance, statistical tools for clustering detection and identification of events belonging to clusters are welcome in epidemiology and seismology. Local second-order statistics can provide information on how an event relates to nearby events. We extend local indicators of spatial association (known as LISA functions) into the spatio-temporal context (which then will be called LISTA functions). These functions can be used for local tests in the context of case-control spatio-temporal point patterns, and are able to assess in the neighbourhood of each event if t…

iOS Applications Testing - Multivocal Sources

2014

Appendix of conference paper: Ivans Kulesovs, iOS Applications Testing, .

Being Carried Away : Fink and Winnicott on the Locus of Playing

2021

Abstract The article investigates the question of the experiential location of the area of play, comparing the accounts of Eugen Fink and Donald Winnicott. It argues that while Fink builds on the phenomenological distinction between subjective phantasy and external perception, and accordingly introduces the area of play as a hybrid realm, a peculiar combination of the two, Winnicott considers the area of play as something that underlies and developmentally precedes the experiential differentiation between phantasy and external reality. While from Fink’s viewpoint Winnicott’s model neglects a central phenomenological distinction, from Winnicott’s viewpoint Fink’s account, in turn, appears ad…