Search results for "Bust"
showing 10 items of 1000 documents
Liver methylene fraction by dual- and triple-echo gradient-echo imaging at 3.0T: Correlation with proton MR spectroscopy and estimation of robustness…
2011
Purpose To assess the systematic errors in liver methylene fraction (LMF) resulting from fat–fat interference effects with dual- and triple-echo gradient-recalled-echo Dual/Triple GRE) sequences and to test the robustness of these sequences after iron overloading. Materials and Methods Forty type-2 diabetic patients underwent LMF measurement by 3.0T 1H magnetic resonance spectroscopy (corrected for T1 and T2 decays) as the reference standard and liver fat fraction (%Fat) measurement by four Dual/Triple GRE sequences with 20° and 60° flip angle (α), corrected for T1 recovery. The same four sequences were repeated in eight patients after ferumoxide injection. Corrections for systematic errors…
Evaluation of prostate segmentation algorithms for MRI: The PROMISE12 challenge
2014
Contains fulltext : 137969.pdf (Publisher’s version ) (Open Access) Prostate MRI image segmentation has been an area of intense research due to the increased use of MRI as a modality for the clinical workup of prostate cancer. Segmentation is useful for various tasks, e.g. to accurately localize prostate boundaries for radiotherapy or to initialize multi-modal registration algorithms. In the past, it has been difficult for research groups to evaluate prostate segmentation algorithms on multi-center, multi-vendor and multi-protocol data. Especially because we are dealing with MR images, image appearance, resolution and the presence of artifacts are affected by differences in scanners and/or …
Comparison of short-term heart rate variability indexes evaluated through electrocardiographic and continuous blood pressure monitoring
2019
Heart rate variability (HRV) analysis represents an important tool for the characterization of complex cardiovascular control. HRV indexes are usually calculated from electrocardiographic (ECG) recordings after measuring the time duration between consecutive R peaks, and this is considered the gold standard. An alternative method consists of assessing the pulse rate variability (PRV) from signals acquired through photoplethysmography, a technique also employed for the continuous noninvasive monitoring of blood pressure. In this work, we carry out a thorough analysis and comparison of short-term variability indexes computed from HRV time series obtained from the ECG and from PRV time series …
Entrepreneurial orientation, concern for socioemotional wealth preservation, and family firm performance
2021
Abstract This paper explores whether concern for socioemotional wealth enhances or undermines the positive effect of entrepreneurial orientation on family firm performance. Two analysis techniques were used: second-generation structural equation modeling (PLS-SEM) and fuzzy-set qualitative comparative analysis (fsQCA). These techniques were applied to data on 106 Spanish family firms. Results of both analyses are similar, lending validity and robustness to the proposed research model. Specifically, the results indicate that 1) entrepreneurial orientation positively influences family firm performance, 2) concern for socioemotional wealth preservation positively influences both entrepreneuria…
The Robustness of National Agency Governance in Integrated Administrative Systems: Evidence from a large-scale study
2020
This article examines government agencies facing choice architectures that are multiple, overlapping, ambiguous, and sometimes incompatible—in short: turbulent. It makes two contributions: First, two conceptual images of agency governance are outlined that derive distinct predictions on how agencies are likely to maneuver when embedded in integrated multilevel administrative orders. Secondly, benefitting from a large‐N dataset on agency officials (N = 1,963) from 47 government agencies, the study suggests that government agencies are primarily biased towards a pragmatist compound dynamic. Additionally, the analysis probes the robustness of these conceptual images by entering moderator varia…
The influence of geographical concentration and structural characteristics on the survival chance of textile firms
2013
[EN] Purpose The purpose of this paper is to evaluate the contribution of location (geographical concentration) and firm structure (age and subsector) to the risk of business failure. Design/methodology/approach The Markov s regression analysis was made for a sample of over 11,700 Spanish textile-clothing firms. Findings The results obtained from the analysis suggest that the risk of business failure is increased by some risk factors relative to the structural characteristics of the firms (younger firms and specialization in low-tech activities), and under determined locational circumstances. Research limitations/implications Our conclusions have been obtained starting from a sample of manu…
A new minimum spanning tree-based method for shape description and matching working in Discrete Cosine space
2009
In this article, a new minimum spanning tree-based method for shape description and matching is proposed. Its properties are checked through the problem of graphical symbols recognition. Recognition invariance in front shift and multi-oriented noisy objects was studied in the context of small and low resolution binary images. The approach seems to have many desirable properties, even if the construction of graphs induces an expensive algorithmic cost. In order to reduce time computing, an alternative solution based on image compression concepts is provided. The recognition is realized in a compact space, namely the Discrete Cosine space. The use of block discrete cosine transform is discuss…
Klasiskas un robustas MANOVA analīzes metodes
2019
Daudzdimensiju dispersiju analīze (MANOVA) tiek pielietota situācijās, kad tiek mērīti vairāki mainīgie katrai eksperimentālai vienībai. Darbā aplūkota teorija par klasisko MANOVA metodi un robusto MANOVA metodi, to pieņēmumiem un pielietojumiem. Bieži datos tiek novēroti izlēcēji, kuri atšķiras no pārējiem datiem. Analizējot datus, šie izlēcēji var būtiski ietekmēt parametru novērtējumus, šādās situācijās ieteicams izmantot robustas statistikas metodes. Tika secināts, ka robustā MANOVA metode ne vienmēr dod precīzākus rezultātus par klasisko MANOVA metodi. Atslēgas vārdi: Daudzdimensiju analīze, MANOVA, robusta MANOVA, Vilksa Lambda statistika
Gasless Combustion Regimes Near the Concentration Limits of Extinction
2008
International audience
Thermal kinetics for the energy valorisation of polylactide/sisal biocomposites
2018
[EN] The thermal stability and decomposition kinetics of PLA/sisal biocomposites was discussed to evaluate the suitability of their use in energy recovery processes such as pyrolysis and combustion. The influence of the addition of sisal up to 30%wt, the presence of coupling agent, and the atmosphere of operation, i.e. inert or oxidative was discussed by means of multi-rate linear non-isothermal thermogravimetric experiments. All biocomposites showed a mean high heating value of 15 MJ/kg indicating their suitability for energy recovery processes. The thermal requirements of PLA/sisal decomposition were assessed in terms of onset decomposition temperature and apparent activation energy. A mi…