The Experts below are selected from a list of 66 Experts worldwide ranked by ideXlab platform
Hasan Sözer - One of the best experts on this subject based on the ideXlab platform.
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Reproducing failures based on semiformal failure scenario descriptions
Software Quality Journal, 2017Co-Authors: Gün Karagöz, Hasan SözerAbstract:Due to the increasing size and complexity of software systems, it becomes hard to test these systems exhaustively. As a result, some faults can be left undetected. Undetected faults can lead to failures in deployed systems. Such failures are usually reported by the users from the field or test engineers back to developers. It requires considerable Time and effort to analyze and reproduce the reported failures because their descriptions are not always complete, structured and formal. In this paper, we introduce a novel approach for automatically reproducing failures to aid their debugging. Our approach relies on semi-structured failure scenario descriptions that employ a set of keywords. These descriptions are preprocessed and mapped to a set of predefined test case templates with valid input sets. Then, test cases are generated and executed to reproduce the reported failure scenarios. The approach is evaluated with an industrial case study performed in a company from the telecommunications domain. Several failures were successfully reproduced. The approach is also adopted in the quality assurance process of the company. After one-Time Preparation of reusable test case templates and training of test engineers, 24.9 % of the reported failures (and 40 % of those that were manually reproducible) could be reproduced without any manual effort.
Gün Karagöz - One of the best experts on this subject based on the ideXlab platform.
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Reproducing failures based on semiformal failure scenario descriptions
Software Quality Journal, 2017Co-Authors: Gün Karagöz, Hasan SözerAbstract:Due to the increasing size and complexity of software systems, it becomes hard to test these systems exhaustively. As a result, some faults can be left undetected. Undetected faults can lead to failures in deployed systems. Such failures are usually reported by the users from the field or test engineers back to developers. It requires considerable Time and effort to analyze and reproduce the reported failures because their descriptions are not always complete, structured and formal. In this paper, we introduce a novel approach for automatically reproducing failures to aid their debugging. Our approach relies on semi-structured failure scenario descriptions that employ a set of keywords. These descriptions are preprocessed and mapped to a set of predefined test case templates with valid input sets. Then, test cases are generated and executed to reproduce the reported failure scenarios. The approach is evaluated with an industrial case study performed in a company from the telecommunications domain. Several failures were successfully reproduced. The approach is also adopted in the quality assurance process of the company. After one-Time Preparation of reusable test case templates and training of test engineers, 24.9 % of the reported failures (and 40 % of those that were manually reproducible) could be reproduced without any manual effort.
Thierry Hasbroucq - One of the best experts on this subject based on the ideXlab platform.
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The dual nature of Time Preparation: neural activation and suppression revealed by transcranial magnetic stimulation of the motor cortex
European Journal of Neuroscience, 2007Co-Authors: Karen Davranche, Christophe Tandonnet, Boris Burle, Chloé Meynier, Franck Vidal, Thierry HasbroucqAbstract:Single-pulse transcranial magnetic stimulations (TMSs) of the motor cortex (M1) were performed in order to decipher the neural mechanisms of Time Preparation. We varied the degree to which it was possible to prepare for the response signal in a choice reaction Time (RT) task by employing either a short (500 ms) or a long (2500 ms) foreperiod in separate blocks of trials. Transcranial magnetic stimulations were delivered during these foreperiods in order to study modulations in both the size of the motor evoked potential (MEP) and the duration of the silent period (SP) in tonically activated response agonists. Motor evoked potential area and silent period duration were assumed to reflect, respectively, the excitability of the cortico-spinal pathway and the recruitment of inhibitory cortical interneurons. Shorter reaction Times were observed with the shorter foreperiod, indicating that a better level of Preparation was attained for the short foreperiod. Silent period duration decreased as Time elapsed during the foreperiod and this decrement was more pronounced for the short foreperiod. This result suggests that Time Preparation is accompanied by a removal of intracortical inhibition, resulting in an activation. Motor evoked potential area decreased over the course of the short foreperiod, but not over the long foreperiod, revealing that Time Preparation involves the inhibition of the cortico-spinal pathway. We propose that cortico-spinal inhibition secures the development of cortical activation, preventing erroneous premature responding.
Karen Davranche - One of the best experts on this subject based on the ideXlab platform.
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The dual nature of Time Preparation: neural activation and suppression revealed by transcranial magnetic stimulation of the motor cortex
European Journal of Neuroscience, 2007Co-Authors: Karen Davranche, Christophe Tandonnet, Boris Burle, Chloé Meynier, Franck Vidal, Thierry HasbroucqAbstract:Single-pulse transcranial magnetic stimulations (TMSs) of the motor cortex (M1) were performed in order to decipher the neural mechanisms of Time Preparation. We varied the degree to which it was possible to prepare for the response signal in a choice reaction Time (RT) task by employing either a short (500 ms) or a long (2500 ms) foreperiod in separate blocks of trials. Transcranial magnetic stimulations were delivered during these foreperiods in order to study modulations in both the size of the motor evoked potential (MEP) and the duration of the silent period (SP) in tonically activated response agonists. Motor evoked potential area and silent period duration were assumed to reflect, respectively, the excitability of the cortico-spinal pathway and the recruitment of inhibitory cortical interneurons. Shorter reaction Times were observed with the shorter foreperiod, indicating that a better level of Preparation was attained for the short foreperiod. Silent period duration decreased as Time elapsed during the foreperiod and this decrement was more pronounced for the short foreperiod. This result suggests that Time Preparation is accompanied by a removal of intracortical inhibition, resulting in an activation. Motor evoked potential area decreased over the course of the short foreperiod, but not over the long foreperiod, revealing that Time Preparation involves the inhibition of the cortico-spinal pathway. We propose that cortico-spinal inhibition secures the development of cortical activation, preventing erroneous premature responding.
Derek Renshaw - One of the best experts on this subject based on the ideXlab platform.
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ascorbyl palmitate dspe peg nanocarriers for oral iron delivery Preparation characterisation and in vitro evaluation
Colloids and Surfaces B: Biointerfaces, 2014Co-Authors: M. Zariwala, Sebastien Farnaud, Zahra Merchant, Satyanarayana Somavarapu, Derek RenshawAbstract:The objective of this study was to encapsulate iron in nanocarriers formulated with ascorbyl palmitate and 1,2-distearoyl-sn-glycero-3-phosphoethanolamine polyethylene glycol (DSPE-PEG) for oral delivery. Blank and iron (Fe) loaded nanocarriers were prepared by a modified thin film method using ascorbyl palmitate and DSPE-PEG. Surface charge of the nanocarriers was modified by the inclusion of chitosan (CHI) during the formulation process. Blank and iron loaded ascorbyl palmitate/DSPE nanocarriers were visualised by transmission electron microscopy (TEM) and physiochemical characterisations of the nanocarriers carried out to determine the mean particle size and zeta potential. Inclusion of chitosan imparted a net positive charge on the nanocarrier surface and also led to an increase in mean particle size. Iron entrapment in ascorbyl palmitate-Fe and ascorbyl palmitate-CHI-Fe nanocarriers was 67% and 76% respectively, suggesting a beneficial effect of chitosan on nanocarrier Fe entrapment. Iron absorption was estimated by measuring Caco-2 cell ferritin formation using ferrous sulphate as a reference standard. Iron absorption from ascorbyl palmitate-Fe (592.17 ± 21.12 ng/mg cell protein) and ascorbyl palmitate-CHI-Fe (800.12 ± 47.6 ng/mg, cell protein) nanocarriers was 1.35-fold and 1.5-fold higher than that from free ferrous sulphate, respectively (505.74 ± 23.73 ng/mg cell protein) (n = 6, p < 0.05). This study demonstrates for the first Time Preparation and characterisation of iron loaded ascorbyl palmitate/DSPE PEG nanocarriers, and that engineering of the nanocarriers with chitosan leads to a significant augmentation of iron absorption.