On the Disadvantages of Media as a Service with Regard to Psychological Ownership

Media as a Service (MaaS), which enables customers to access entire media libraries over a subscription period, has become an important revenue driver for the entertainment industry. By using an experiment related to music consumption, our study suggests that MaaS services, and in particular the ones that are free of charge, cause customers to feel a lower degree of psychological ownership (PO) for the provided content than for content provided via physical media and media files. Since PO is known to be an important driver of customers’ behaviors and feelings such as their willingness to pay, these findings suggest that PO might hinder MaaS’ continuing success

The Exrensible Markup Language - New Opportunities in the area of EDI

Only about 5% of the companies which could profit from EDI actually use it. The main reason is that especially small and medium-sized enterprises (SMEs) try to avoid the considerable setup- and operating costs of traditional EDI solutions. We demonstrate how new emerging network technologies such as XML and Java can open communications networks and shape the way businesses can interact with one another. Together with our partner Lufthansa AirPlus we developed an XMLbased WebEDI solution that aims at lowering setup and running costs, opening EDI networks to SMEs and enabling more dynamic business partnerships. The XMLbased architecture of the solution makes a simple support of different standards possible. In a very efficient and flexible way any transaction content can be altered and adapted to different needs because semantics and structure are no longer hard-coded part of the application but of the exchanged XML-document

Data Access for LIGO on the OSG

During 2015 and 2016, the Laser Interferometer Gravitational-Wave Observatory (LIGO) conducted a three-month observing campaign. These observations delivered the first direct detection of gravitational waves from binary black hole mergers. To search for these signals, the LIGO Scientific Collaboration uses the PyCBC search pipeline. To deliver science results in a timely manner, LIGO collaborated with the Open Science Grid (OSG) to distribute the required computation across a series of dedicated, opportunistic, and allocated resources. To deliver the petabytes necessary for such a large-scale computation, our team deployed a distributed data access infrastructure based on the XRootD server suite and the CernVM File System (CVMFS). This data access strategy grew from simply accessing remote storage to a POSIX-based interface underpinned by distributed, secure caches across the OSG.Comment: 6 pages, 3 figures, submitted to PEARC1

Who chooses? A sociological portrait of families active in school choice in urban areas in the U.S.

School choice and charter school research acknowledges that choosers, families that are active in school choice, are different than non-choosers, but the nature of this difference is rarely examined directly. For years, commentators have expressed concern that chooser families will tend to have more educationally engaged parents than nonchooser families (Carnoy, 1993; Henig, 1995a). However, this hypothesis is rarely tested, in part due to data limitations in many school choice studies. Prior research has established the choosers tend to be more affluent than nonchoosers, but few attempts have been made to explain why this gap occurs (e.g. Cullen, Jacob, and Levitt, 2005; Martinez, Godwin, and Kemerer, 1996; Holme & Richards, 2009.) A more sophisticated understanding of the difference between choosers and nonchoosers is not only important for basic knowledge on school choice but also would contribute to a growing body of research on the sorting effects of school choice. There are growing concerns that school choice can function as a sorting mechanism, exacerbating segregation along racial and socioeconomic lines (e.g. Koedel, Betts, Rice & Zau, 2009; Garcia, 2008). Although some studies indicate that racial segregation may be getting worse through school choice, negative impacts on socioeconomic segregation tend to be the most common finding in studies on this topic (Holme & Wells, 2008; Garcia, 2010). However, the crudeness of socioeconomic information in school enrollment data means that these studies could be overestimating or underestimating the changes in segregation that are occurring through school choice. If choosers and nonchoosers tend to differ in ways that are not easily observable in most school data, the impacts of school choice as a sorting mechanism may not be fully understood. The gap between choosers and nonchoosers is a foundational issue for school choice research, and the question deserves to be approached with more detailed sociological analysis than has typically been conducted in school choice research thus far. Sociologists may also be interested in the relationships between parenting practices, socioeconomic status, and school choice. One of the leading theories on how parents transmit their advantages to their children emphasizes a specific, highly active type of parental involvement (Lareau, 2003). Research has found that these parenting practices are associated with higher academic achievement (Cheadle, 2009). Establishing a link between this parenting strategy and active participation in school choice would help expand the literature on how middle and upper class families utilize their social and material resources to help separate themselves from lower social strata. This study uses a recent nationally representative dataset of kindergartners and their parents to provide one of the most thorough sociological comparisons of choosers and nonchoosers to date. The 2010-11 Early Childhood Longitudinal Study (ECLS-K: 2011) has extensive surveys of parents, including questions about school choice, family structure, parenting behaviors, parent-child relationships, previous educational consumption decisions, and detailed socioeconomic data. After restricting the dataset to families in urban areas, non-choosers and three types of choosers are identified: • Residential public choosers- Families that moved to a certain location to attend a school. • Private school choosers- Families who sent their child to a private school. • Nonresidential public choosers- Families utilizing public school choice options, including those who actively selected charter schools, their “assigned” public school, magnet schools, or other traditional public schools • Nonchoosers- Families that sent their children to the assigned public school without considering other options. Three specific research questions will be examined in this study: 1) Does parental educational engagement or concerted cultivation predict choice and mediate the link between families’ socioeconomic status (SES) and their likelihood of participating in school choice? 2) Do parents’ socioeconomic statuses relative to their neighbors affect their likelihood of participating in school choice, as classic stratification theory would suggest? 3) Do the absolute SES, relative SES, and concerted cultivation effects on choice participation vary by race? Three sets of regression models will be estimated for each of these questions. The three types of active choosers will modeled against nonchoosers in logistic regressions. Regression models will also be run on a sample restricted to lower SES families in order to see if SES and concerted cultivation effects are stronger for this group. Model development for this study is informed by three major sociological perspectives and preliminary modeling of chooser status in an earlier version of this dataset, ECLS-K: 1999 (Weitzel, 2010). First, family process or family socialization models suggest that poverty creates substantial burdens for parents, making it more difficult for parents to engage in kids’ educational matters (e.g. Cooper, Crosnoe, Suizzo, and Pituch, 2010; Bodovski & Youn, 2010; Crosnoe & Cooper, 2010). Many family process models aim to define and test mediators that help explain the link between family’s SES and social or educational outcomes. Similarly, this study aims to explain the association between higher SES and a greater likelihood of participating in school choice. Family process models inform the overall mediational approach used in this study. Second, a prominent theory on parental engagement in education helps inform the mediation model for research question #1. Lareau’s (2003) concept of concerted cultivation, one of the leading theories on the transmission of socioeconomic status from parents to children, suggests that middle and upper class parents tend to take a very deliberate and hands-on approach to promoting children’s development. Working class parents, on the other hand, are more likely to step back and permit the “accomplishment of natural growth” in their children. The tendency of middle and upper class parents toward deliberate, positive action regarding child development could also lead to active involvement in school choice. Lastly, classic stratification theories suggest a competing notion of families’ motivations for school choice (e.g. Weber, 1947; Grusky, 2008). Classic stratification theory suggests that patterns of consumption are one of the major ways that different social classes separate themselves. For families wishing to distinguish themselves from their neighbors, school choice may be one way to accomplish that goal. In research question 2, indicators of families’ SES relative to their neighborhood are added to the models and interacted with SES to test this hypothesis. The descriptive results indicate that the private choosers were the most advantaged group on measures including socioeconomic status, family size, two- parent households, the use of English in the home, the use of center-based preschools, extracurricular activities for children, and several other measures. Non-choosers were the least affluent or advantaged of the four groups, and urban residential choosers were only slightly better off than non-choosers on most measures. Non-residential public choosers, which includes those attending magnet and charter schools, were more affluent than non-choosers and residential public choosers. The regression models include SES and concerted cultivation composites, home language indicators, preschool usage variables, a thorough set of controls for demographics, family composition, and neighborhood poverty. These models fit much better when modeling private school choice than for residential and non-residential public choice, perhaps due to the high direct costs of private school attendance. Model fit for non-residential public chooser models was better than that for residential choosers, which had rather poor fit overall. For private and non-residential public choosers, SES associations with choice were relatively strong, even after adding the full set of controls and concerted cultivation measures. The association between higher SES and the likelihood of participating in choice was even stronger when the sample was limited to families with SES below the national mean. Racial interaction effects indicated that SES effects were also stronger for black and Hispanic families, with especially strong effects for Hispanics. Interestingly, SES effects for urban residential choosers were not very strong and the direction of some other effects were the opposite of those seen for private and non-residential choosers. For example center-based preschool attendance was fairly strongly positively associated with private and non-residential public choice, but it was negatively associated with residential public choice. The positive association between residential choice and speaking a non-English language at home was also unexpected. Black and Asian families were more likely to be residential public choosers, even after all controls were added to the models. The results suggest that residential choice in urban areas may have a notably different profile than suburban residential choice. Residential school choice in urban areas may be serving as a vehicle for ethnocentric school moves, but this hypothesis will certainly need to be tested further. While SES effects varied by chooser type, the positive association between concerted cultivation and choice was moderately large and basically the same size for all three chooser types. Concerted cultivation, which was measured with a composite consisting of students’ participation in extracurricular activities and the number of books at home, did also mediate the relationship between SES and choice in a statistically significant way. As with the SES effects, concerted cultivation effects were stronger for lower SES families and for black and Hispanic families. When parental involvement in education was instead captured with measures of low-cost home-based activities like reading, making art, and telling stories at home, the composite had basically no association with school choice. High cost, transportation-intensive activities in the concerted cultivation composite, on the other hand, were rather positively associated with school choice. These results could suggest that participation in school choice is more affected by families’ economic means than by their attitudes or interest in educational engagement. This possibility would need to be investigated further in follow-up studies. Classic stratification theory suggests that families will make school selections consistent with their perceived social class. For research question #2 in this study, it was predicted that families would be more likely to select private or non-residential public schools when they were in a higher socioeconomic position than their neighbors. Results indicate that having educational attainment above the median in their neighborhood was moderately positively associated private school choice. When race interactions were added to the models, relatively strong positive associations between this measure and private choice were found for white and black families but not for other groups. For non-residential public choice, a positive association between this indicator and choice was also found for white families but not for other groups. This classic stratification hypothesis should be studied further with better measures of families’ SES positions and racial identities in relation to their neighbors. Implications of this study and additional recommendations for further research are discussed in the final chapter. Although ECLS data do not enable the direct observation of sorting effects through school choice, this exploratory study does suggest that student sorting may be occurring through school choice in ways that will be very difficult to observe through regular enrollment data. Adding better measures of family SES and parenting practices to traditional sorting studies will enable more rigorous examination of this possibility. This study also expands the literature around concerted cultivation by identifying another social outcome, school choice, with which the construct is associated. Sociologists who are particularly interested in the measurement and effects of concerted cultivation and parental engagement may wish to improve upon this exploratory study with structural equation analyses.

The synthesis and evaluation of novel cholegraphic media.

The development of modern cholegraphic media has taken place over the last half century. The progress made has been notable. The agents presently available allow the physician to visualize the gall bladder and the biliary tree and to consequently diagnose many pathological conditions. However, the use of cholegraphic media, especially those administered intravenously, is not without hazard. Apart from relatively mild side effects such as nausea and diarrhoea, circulatory collapse and acute renal failure have been noted as a consequence of the use of these agents. The widespread use of these compounds as diagnostic agents makes even infrequent fatalities a matter of concern

Long-term stroke risk in moyamoya disease

BACKGROUND: Moyamoya disease is considered a progressive disease with an ongoing risk of recurrent stroke. However, there is a lack of long-term observational data to quantify the extent of the stroke risk.METHODS: This study aimed to provide insight into the long-term stroke risk in MMD and explore possible risk factors for stroke. Records from all patients diagnosed with MMD in 13 clinical departments from six different Danish hospitals between 1994 and 2017 were retrospectively reviewed until 2021.RESULTS: The cohort comprised 50 patients (33 females and 17 males). Patients were followed up for a median of 9.4 years, with more than 10 years of follow-up for 24 patients. Ten patients had 11 new stroke events - 6 ischemic strokes and 5 brain hemorrhages. Events occurred at a median of 7 years and up to 25 years after diagnosis. The overall Kaplan-Meier 5-year stroke risk was 10%. Patients with bypass performed had significantly fewer events than conservatively treated patients (HR 0.25, 95% CI 0.07 - 0.91, p&lt;0.05). All but one event occurred in females, a difference that reached statistical significance.CONCLUSIONS: The study provides data on the extent of the risk of recurrent stroke in MMD. Bypass surgery patients had fewer stroke events than those treated conservatively. There was a trend toward a higher stroke risk in females.DATA ACCESS STATEMENT: The data supporting this study's findings are available from the corresponding author upon reasonable request.</p