Search results for "reliability"
showing 10 items of 1563 documents
Time Dependent Deterioration of the X-Ray Dental Diagnostic Equipment
2013
Modern dental X-ray examinations are essential for diagnosis. The goal of this paper is to demonstrate time dependent behavior of dose providing parameters, which help to determine equipment’s age effects on the x-ray machine parameters. Also the comparisons between two different dental X-ray generator equipment types half-period and high frequency was made.
Reliability Analysis of a Controlled Stage-Constructed and Reinforced Embankment on Soft Ground Using 2D and 3D Models
2020
Geosynthetic reinforcement has become a very practical technique to improve geotechnical structure safety. In spite of improved soil behavior, structures are affected by uncertainties related to soil and reinforcement material properties. This paper aims to present a reliability analysis in order to take statistical information (uncertainties) into account in a safety analysis of reinforced embankments. The analysis was used in a case study on a controlled stage-constructed embankment on soft ground in order to investigate its probabilistic stability. Modeling was performed by commercial geotechnical software usage (GeoStudio and RocScience packs, SIGMA/W+SLOPE/W and SLIDE³, respectively) a…
LONG-TERM STRUCTURAL DEFICIENCIES IN A MAT FOUNDATION ON CLAY SOIL
2013
A 3-story building with a mat foundation consisting of a slab on a grid of grade beams performed poorly on clay soil. Cracking of the slab became rogressively worse as a result of the incorrect esign and fluctuations in the groundwater pressure under the foundation. The cyclic presence and absence of water rusted the steel reinforcement, and the sulfates in the clay soil caused formation of ettringite in the concrete. Plastic hinges formed in the slab and settlements occurred, causing damage to the beams. The situation is still in progress and may lead to the collapse of the structure under normal service conditions. The geotechnical and structural investigations performed to survey and ass…
Strategic Management Simulations: the German Case
1995
This chapter initially considers the rationale and potential value of games and simulations for managerial and executive assessment. Several shortcomings of existing techniques are discussed. In contrast, characteristics of the Strategic Management Simulations (SMS) are described in terms of applicability, reliability, construct validity, predictive validity and other factors. This chapter provides validity information about a German version of the SMS system via a case analysis procedure with two German samples.
Assessing risky and protective behaviors among pedestrians in the Dominican Republic: New evidence about pedestrian safety in the Caribbean
2021
Abstract Introduction Research on pedestrians’ behavior and safety in low and middle-income countries (LMICs) is scarce, compared to high-income economies. This study aimed to present the validation of the Walking Behavior Questionnaire (WBQ), which has not been tested before in the Dominican Republic, and to evaluate age differences in walking-related self-reported behaviors. Methods For this study, a nationwide sample of 1026 pedestrians answered a questionnaire on risky and safe walking behaviors. Psychometric properties of the WBQ, variable correlations and age-based differences in walking were tested. Results Overall, the WBQ presented an adequate structure, goodness-of-fit indexes, an…
Life-space mobility assessment in older people in Finland; measurement properties in winter and spring.
2014
Background: Life-space mobility refers to the spatial area an individual moves through, the frequency and need for assistance. Based on the assumption that measurement scale properties are context-specific, we tested the scale distribution, responsiveness, and reproducibility of the 15-item University of Alabama at Birmingham Study of Aging Life-Space Assessment in older people in Finland, specifically accounting for season. Methods: Community-dwelling older men and women in cent ral Finland aged 75-90 y ears were interviewed to determine life-space mobility (score range 0-120). Baseline (January-June 2012) and one-year follow-up data (January-June 2013; n = 806) from the cohort study “ Lif…
Reliability and Validity of Family Affluence Scale (FAS II) among Adolescents in Beijing, China
2011
This study comprises two sub-studies. Study I assessed the test-retest reliability of Family Affluence Scale (FAS II) items among 95 students aged 11 and 15 years old in Beijing. Study II investigated the completion rate of traditional indicators (parents’ educational level, perceived family wealth, resident area, and school location) measuring socioeconomic status (SES) compared with FAS II, and examined the internal reliability, external and construct validity of the FAS II items in a population of 5876 schoolchildren aged 11, 13 and 15 years old in Beijing. Our study found that the FAS II items have high completion rates (> 99%) which are better than other SES indicators. Analyses of rel…
Testing reliability and validity of Lorensen’s Self-care Capability Scale (LSCS) among older home-living, care-dependent individuals in Norway
2012
dale b., saevareid h. i., soderhamn o. (2013) Testing reliability and validity of Lorensen’s Self-care Capability Scale (LSCS) among older home-living, care-dependent individuals in Norway. International Journal of Older People Nursing 8, 166–173 doi: 10.1111/j.1748-3743.2012.00339.x Aim and objective. The aim of this study was to test reliability and validity of the Lorensen’s Self-Care Capability Scale (LSCS). Background. The assessment of self-care capability among older people living at home is essential for maintaining independence for as long as possible. Method. The study sample consisted of 242 home nursing patients who were 75 + years old and living at home. The responsible home…
Associations between family-related factors, breakfast consumption and BMI among 10- to 12-year-old European children: the cross-sectional ENERGY-stu…
2013
Objective: To investigate associations of family-related factors with children's breakfast consumption and BMI-z-score and to examine whether children's breakfast consumption mediates associations between family-related factors and children's BMI-z-score. Subjects: Ten-to twelve-year-old children (n = 6374; mean age = 11.6 +/- 0.7 years, 53.2% girls, mean BMI-z-score = 0.4 +/- 1.2) and one of their parents (n = 6374; mean age = 41.4 +/- 5.3 years, 82.7% female, mean BMI = 24.5 +/- 4.2 kg/m(2)) were recruited from schools in eight European countries (Belgium, Greece, Hungary, the Netherlands, Norway, Slovenia, Spain, and Switzerland). The children self-reported their breakfast frequency per …
Dimensions underlying frailty indicators in the Kihon Checklist.
2019
Aim Frailty has become a current topic of debate in recent years among researchers as a key concept of clinical care in old age. One of the scales developed for its measurement is the Kihon Checklist (KCL). However, the dimensionality of the KCL has not been tested yet, and therefore the aim of the present study was to validate its dimensional structure. Methods This was a cross-sectional study carried out between March and September 2018 in Valencia province (Spain). Participation in the study was voluntary. A total of 251 participants were sampled. They answered sociodemographic and medical indicators, as well as five frailty scales, including the KCL. Results Five confirmatory models wit…