Search results for " testing"
showing 10 items of 1713 documents
Phase-delayed laser diode array allows ultrasonic guided wave mode selection and tuning
2013
Selecting and tuning modes are useful in ultrasonic guided wave non-destructive testing (NDT) since certain modes at various center frequencies are sensitive to specific types of defects. Ideally one should be able to select both the mode and the center frequency of the launched waves. We demonstrated that an affordable laser diode array can selectively launch either the S0 or A0 ultrasonic wave mode at a chosen center frequency into a polymer plate. A fiber-coupled diode array (4 elements) illuminated a 2 mm thick acrylic plate. A predetermined time delay matching the selected mode and frequency was employed between the output of the elements. The generated ultrasound was detected by a 215…
Wiener-Granger Causality in Network Physiology with Applications to Cardiovascular Control and Neuroscience
2016
Since the operative definition given by C. W. J. Granger of an idea expressed by N. Wiener, the Wiener–Granger causality (WGC) has been one of the most relevant concepts exploited by modern time series analysis. Indeed, in networks formed by multiple components, working according to the notion of segregation and interacting with each other according to the principle of integration, inferring causality has opened a window on the effective connectivity of the network and has linked experimental evidences to functions and mechanisms. This tutorial reviews predictability improvement, information-based and frequency domain methods for inferring WGC among physiological processes from multivariate…
Effects of military training on aerobic fitness, serum hormones, oxidative stress and energy balance, with special reference to overreaching
2012
Usability of the testing criteria for English proficiency in competence tests : assessor perceptions
2010
Tutkimuksen tarkoituksena on selvittää arvioijien näkemyksiä englannin kielen taidon arvioimiseen laadittujen näyttökriteerien käytettävyydestä hotellivirkailijan ja matkailun ohjelmapalvelujen ammattitutkinnoissa. Ilman ammatillista pätevyyttä pitkään työssä olleet aikuiset voivat hankkia ammattitutkinnon Suomessa osoittamalla ammattitaitonsa näyttötutkintojen avulla. Näyttöä vastaanottava oppilaitos laatii näyttökriteerit tutkinnon perusteissa määriteltyjen arviointikriteerien pohjalta. Tarkastelun kohteina tässä tutkimuksessa eivät ole vain arvioijien yleiset näkemykset näyttökriteerien käytöstä pitkällä aikavälillä, vaan myös heidän mielipiteensä hyödyllisistä ja hyödyttömistä kriteerei…
A Dynamic Life-cycle Model for the Provisioning of Software Testing Services: Experiences from A Case Study in the Chinese ICT Sourcing Market
2011
ICT-enabled international sourcing of software-intensive systems and services (eSourcing) is a powerful strategy for managing businesses more effectively. China is becoming a superpower for eSourcing service provisioning, but most Chinese providers are small or medium-sized and leverage the mediated eSourcing model, delivering services to foreign ICT clients that interface with end-clients onshore. This model restricts the providers to low-value projects. This paper probes eSourcing of software testing services within the Chinese market. Testing is studied for two reasons. First, testing is one of the best ICT services, small- and medium-sized providers can provide to develop domain and tec…
Cell-cycle control in cell-biomaterial interactions
2000
Current biocompatibility testing involves the demonstration of cell proliferation, which is usually interpreted as a sign of positive biocompatibility when the materials sustain cell proliferation. As the field of biomaterials research is rapidly moving toward tissue-engineered devices and hybrid organs, control of cell function has become a main topic. Cell function, which involves specific differentiation pathways, cannot be separated from cell-cycle control. The study of cell-cycle control is an important extension of routine proliferation assays and has extensive roots in developmental and tumor biology. We studied the expression of the tumour suppressor gene p53 and the proliferation-a…
Pašregulējoša aizsardzība pret sistēmas pārslodzi
2018
Maģistra darba mērķis ir izveidot no sistēmas veiktspējas atkarīgu sistēmas pārslodzes vadības mehānismu, kas, darbojoties fonā, mēra kopējo sistēmas slodzi un balstoties uz iegūtajiem rezultātiem regulē sniedzamo servisu apjomu. Nepietiekamas veiktspējas gadījumā tiek veidotas gaidītāju rindas jaunajiem lietotājiem, tā ļaujot efektīvi pabeigt iesāktās darbības sistēmā esošajiem lietotājiem. Lietotāji, kas atrodas gaidītāju rindā, tiek informēti par aptuveno gaidīšanas laiku, pēc kura varēs piekļūt pieprasītajai funkcionalitātei. Darbā ir aprakstīts risinājums, kas veicina augstāku servisu saņemšanas kvalitāti, izvairoties no sistēmas pārslodzes radītām atteicēm un samazinot ar sistēmas lēn…
On the use of the EMI for the health monitoring of bonded elements
2014
The low weight, robustness and fatigue resistance of adhesive joints make them suitable for structural joints. A fully developed nondestructive evaluation technique however is needed to monitor and assess the quality of bonded joints. In the present paper the application of the electromechanical impedance (EMI) technique is proposed. In the EMI method a piezoelectric transducer (PZT) is attached to the structure of interest. The high sensitivity and low power consumption make the EMI method feasible for real time structural health monitoring. In this study we investigated the sensitivity of the electromechanical response of a PZT to the curing and the quality of the adhesive used for bonded…
Active lighting applied to three-dimensional reconstruction of specular metallic surfaces by polarization imaging
2006
International audience; In the field of industrial vision, the three-dimensional inspection of highly reflective metallic objects is still a delicate task. We deal with a new automated three-dimensional inspection system based on polarization analysis. We first present an extension of the shape-from-polarization method for dielectric surfaces to metallic surfaces. Then, we describe what we believe to be a new way of solving the ambiguity concerning the normal orientation with an active lighting system. Finally, applications to shape-defect detection are discussed, and the efficiency of the system to discriminate defects on specular metallic objects made by stamping and polishing is presente…
Lääkintälaitteiden kyberturvallisuuden standardit ja testaaminen
2017
Tietotekniikkaa sisältävät lääkintälaitteet pitävät meidät hengissä, jos kehomme pettää. Esimerkiksi ostoskeskuksissa olevat älykkäät defibrillaattorit antavat maallikoillekin mahdollisuuden antaa tehokasta ensiapua sydänkohtaukseen. Tietotekniikan käyttäminen lääkintälaitteissa tuo mahdollisuuksien lisäksi uhkia. Tässä tutkielmassa perehdytään siihen, miten standardit ja testaaminen edistävät kyberturvallisuutta, uhkien torjumista. Ensin tehdään katsaus kirjallisuuteen ja standardeihin ja sitten kytketään tieto käytäntöön testaamalla potilasmonitoria kirjallisuuden pohjalta. Tulos oli, että tutkittava potilasmonitori oli hyvin avoin fyysisen käyttöliittymän kautta. Esimerkiksi potilastiedo…