Navigating MazeMap: indoor human mobility, spatio-logical ties and future potential

Global navigation systems and location-based services have found their way into our daily lives. Recently, indoor positioning techniques have also been proposed, and there are several live or trial systems already operating. In this paper, we present insights from MazeMap, the first live indoor/outdoor positioning and navigation system deployed at a large university campus in Norway. Our main contribution is a measurement case study; we show the spatial and temporal distribution of MazeMap geo-location and wayfinding requests, construct the aggregated human mobility map of the campus and find strong logical ties between different locations. On one hand, our findings are specific to the venue; on the other hand, the nature of available data and insights coupled with our discussion on potential usage scenarios for indoor positioning and location-based services predict a successful future for these systems and applications.Comment: 6 pages, accepted at PerMoby Workshop at IEEE PerCom 201

Arion: a realistic projection simulator for optimizing laboratory and industrial micro-CT

Optimal scanning conditions in a X-ray Computed Tomography scan are determined by the source and detector of the CT-scanner and composition, size and density of the sample. Because all these components have an energy-dependent behaviour, optimizing a CT scan is not straightforward. In order to ease this process a GPU-accelerated realistic projection simulator, Arion, is developed. Arion allows the user to simulate realistic radiographic projections for a certain geometry while taking into account the polychromatic behaviour of X-ray tube, detector and sample. This allows the user to produce realistic CT datasets that can be used to optimize the scanning conditions for a certain sample

Quality of Maternal Death Documentation in Afghanistan:A Retrospective Health Facility Record Review

Objectives: To assess the quality of health facility documentation related to maternal deaths at health facilities in Afghanistan. Methods: Analysis of a subset of findings from the 2016 National Maternal and Newborn Health Quality of Care Assessment in Afghanistan. At each facility, maternity registers were reviewed to obtain data related to maternity caseload, and number and causes of maternal deaths in the year preceding the survey. Detailed chart reviews were conducted for up to three maternal deaths per facility. Analyses included completeness of charts, quality of documentation, and cause of death using WHO application of International Statistical Classification of Disease to deaths during pregnancy, childbirth and the puerperium. Key findings: Only 129/226 (57%) of facilities had mortality registers available for review on the day of assessment and 41/226 (18%) had charts documenting maternal deaths during the previous year. We reviewed 68 maternal death cases from the 41 facilities. Cause of death was not recorded in nearly half of maternal death cases reviewed. Information regarding mode of birth was missing in over half of the charts, and one third did not capture gestational age at time of death. Hypertensive disorders of pregnancy and obstetric hemorrhage were the most common direct causes of death, followed by maternal sepsis and unanticipated complications of clinical management including anesthesia-related complications. Documented indirect causes of maternal deaths were anemia, cardiac arrest, kidney and hepatic failure. Charts revealed at least eight maternal deaths from indirect causes that were not captured in register books, indicating omission or misclassification of registered deaths. Conclusion: Considerable gaps in quality of recordkeeping exist in Afghanistan, including underreporting, misclassification and incompleteness. This hampers efforts to improve quality of maternal and newborn health data and priority setting

Language Entropy Relates to Behavioral and Pupil Indices of Executive Control in Young Adult Bilinguals

Introduction: It has been proposed that bilinguals’ language use patterns are differentially associated with executive control. To further examine this, the present study relates the social diversity of bilingual language use to performance on a color-shape switching task (CSST) in a group of bilingual university students with diverse linguistic backgrounds. Crucially, this study used language entropy as a measure of bilinguals’ language use patterns. This continuous measure reflects a spectrum of language use in a variety of social contexts, ranging from compartmentalized use to fully integrated use. Methods: Language entropy for university and non-university contexts was calculated from questionnaire data on language use. Reaction times (RTs) were measured to calculate global RT and switching and mixing costs on the CSST, representing conflict monitoring, mental set shifting, and goal maintenance, respectively. In addition, this study innovatively recorded a potentially more sensitive measure of set shifting abilities, namely, pupil size during task performance. Results: Higher university entropy was related to slower global RT. Neither university entropy nor non-university entropy were associated with switching costs as manifested in RTs. However, bilinguals with more compartmentalized language use in non-university contexts showed a larger difference in pupil dilation for switch trials in comparison with non-switch trials. Mixing costs in RTs were reduced for bilinguals with higher diversity of language use in non-university contexts. No such effects were found for university entropy. Discussion: These results point to the social diversity of bilinguals’ language use as being associated with executive control, but the direction of the effects may depend on social context (university vs. non-university). Importantly, the results also suggest that some of these effects may only be detected by using more sensitive measures, such as pupil dilation. The paper discusses theoretical and practical implications regarding the language entropy measure and the cognitive effects of bilingual experiences more generally, as well as how methodological choices can advance our understanding of these effects