Search results for "Taus"

EJB:n eri käyttötapojen tehokkuus tiedonsiirrossa tietokantaan käyttäen OC4J palvelinta

2002

Evolutionary design optimization with Nash games and hybridized mesh/meshless methods in computational fluid dynamics

2012

GEM-TPC-ilmaisimen testimittausten datan analyysi

2017

GEM-TPC-ilmaisin on kaasutäytteinen hiukkasilmaisin, jolla pystytään mittaaamaan hyvin pieniä sähköisiä signaaleja ja niiden syntypaikkaa ilmaisimessa. Näitä ilmaisimia tullaan tulevaisuudessa käyttämään mm. FAIRtutkimuslaitoksen Super-FRS-nimisessä fragmenttiseparaattorissa. Tässä tutkielmassa analysoin kesällä 2016 GEM-TPC:llä GSI:ssä suoritettuja ilmaisintestimittauksia ROOT-ohjelmiston avulla. Alkuun kerron, miksi GEM-TPC-ilmaisin on lähdetty suunnittelemaan, minkälaisia mittauksia ja missä sillä on tarkoitus tehdä. Tutkielman loppupuolella analysoin testimittausten tuloksia. GSI:ssä GEM-TPC:tä testattiin Xe- ja C-suihkujen avulla. Tässä tutkielmassa perehdyn syvemmin C-suihkusta tehtyi…

An Approach to the Automatic Comparison of Reference Point-Based Interactive Methods for Multiobjective Optimization

2021

Solving multiobjective optimization problems means finding the best balance among multiple conflicting objectives. This needs preference information from a decision maker who is a domain expert. In interactive methods, the decision maker takes part in an iterative process to learn about the interdependencies and can adjust the preferences. We address the need to compare different interactive multiobjective optimization methods, which is essential when selecting the most suited method for solving a particular problem. We concentrate on a class of interactive methods where a decision maker expresses preference information as reference points, i.e., desirable objective function values. Compari…

GDL90fuzz: Fuzzing - GDL-90 Data Interface Specification Within Aviation Software and Avionics Devices–A Cybersecurity Pentesting Perspective

2022

As the core part of next-generation air transportation systems, the Automatic Dependent Surveillance-Broadcast (ADS-B) is becoming very popular. However, many (if not most) ADS-B devices and implementations support and rely on Garmin’s GDL-90 protocol for data exchange and encapsulation. In this paper, we research GDL-90 protocol fuzzing options and demonstrate practical Denial-of-Service (DoS) attacks on popular Electronic Flight Bag (EFB) software operating on mobile devices. For this purpose, we specifically configured our own avionics pentesting platform. and targeted the popular Garmin’s GDL-90 protocol as the industry-leading devices operate on it. We captured legitimate traffic from …

Demographic Differences in the Effectiveness of a Physical Activity Application to Promote Physical Activity: Study Among Aged People

2021

The global population is ageing and simultaneously the life expectancy at older ages is improving. To support healthy and active aging, it is imperative to find solutions to support physical activity (PA) in older age. Digital wellness technologies are a potential solution, but in order for such technologies to be successful, research is needed to gain a better understanding on their use and effectiveness among aged people. To address this need, this study investigated the effectiveness of a physical activity application to promote PA behavior among aged people of different demographics (gender, age, education, marital status). PA levels were measured before taking the application into use …

Subjective health literacy : Development of a brief instrument for school-aged children

2016

Aims: The present paper focuses on the measurement of health literacy (HL), which is an important determinant of health and health behaviours. HL starts to develop in childhood and adolescence; hence, there is a need for instruments to monitor HL among younger age groups. These instruments are still rare. The aim of the project reported here was, therefore, to develop a brief, multidimensional, theory-based instrument to measure subjective HL among school-aged children. Methods: The development of the instrument covered four phases: item generation based on a conceptual framework; a pilot study ( n = 405); test–retest ( n = 117); and construction of the instrument ( n = 3853). All the samp…

Monitoring peatland water table depth with optical and radar satellite imagery

2022

Peatland water table depth (WTD) and wetness have widely been monitored with optical and synthetic aperture radar (SAR) remote sensing but there is a lack of studies that have used multi-sensor data, i.e., combination of optical and SAR data. We assessed how well WTD can be monitored with remote sensing data, whether multi-sensor approach boosts explanatory capacity and whether there are differences in regression performance between data and peatland types. Our data consisted of continuous multiannual WTD data from altogether 50 restored and undrained Finnish peatlands, and optical (Landsat 5–8, Sentinel-2) and Sentinel-1 C-band SAR data processed in Google Earth Engine. We calculated rando…

Item response theory and differential test functioning analysis of the HBSC-Symptom-Checklist across 46 countries

2022

Abstract Background The Symptom Checklist (SCL) developed by the Health Behaviour in School-aged Children (HBSC) study is a non-clinical measure of psychosomatic complaints (e.g., headache and feeling low) that has been used in numerous studies. Several studies have investigated the psychometric characteristics of this scale; however, some psychometric properties remain unclear, among them especially a) dimensionality, b) adequacy of the Graded Response Model (GRM), and c) measurement invariance across countries. Methods Data from 229,906 adolescents aged 11, 13 and 15 from 46 countries that participated in the 2018 HBSC survey were analyzed. Adolescents were selected using representative s…

Cross‐national validation of the Social Media Disorder‐scale : Findings from adolescents from 44 countries

2022

Background and aims There is currently no cross-national validation of a scale that measures problematic social media use (SMU). The present study investigated and compared the psychometric properties of the Social Media Disorder (SMD)-scale among young adolescents from different countries. Design Validation study. Setting and participants Data came from 222,532 adolescents from 44 countries participating in the Health Behaviour in School-aged Children (HBSC) survey (2017/2018). The HBSC survey was conducted in the European region and Canada. Participants were on average 13.5 years old (SD = 1.6) and 51.2% were girls. Measurement Problematic SMU was measured using the 9-item SMD-scale with …