613 research outputs found

    Influence of cementless hip stems on femoral cortical strain pattern depending on their extent of porous coating

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    The extent of porous coating of cementless total hip stems is held responsible for radiological periprosthetic changes, the rate of thigh pain, and even its long-term success. However, there is only sparse knowledge on how the biomechanical loading conditions of the femur are influenced by the extent of porous coating in the early phase after implantation of a cementless hip stem. Aiming to evaluate the effect of surface structuring on the strain pattern of the femur, we implanted three anatomic hip stems with different extents of porous coating (full, two-thirds proximal, and penguin type) in second-generation composite femora coated with a photoelastic layer. A cortical strain mapping was conducted before and after insertion of the implants under standardized loading conditions considering relevant muscle forces. The results of the statistical analysis of three different implantation sequences proved that composite femora are suitable for repeated measurements within the applied experimental setup. Cortical strain changes including stress-shielding effects medially (-60%) and laterally (-50%) were validated with a cadaver femur. The extent of porous coating had no significant influence on the surface strain pattern for an immediate postoperative situation

    Student profiling in a dispositional learning analytics application using formative assessment

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    How learning disposition data can help us translating learning feedback from a learning analytics application into actionable learning interventions, is the main focus of this empirical study. It extends previous work where the focus was on deriving timely prediction models in a data rich context, encompassing trace data from learning management systems, formative assessment data, e-tutorial trace data as well as learning dispositions. In this same educational context, the current study investigates how the application of cluster analysis based on e-tutorial trace data allows student profiling into different at-risk groups, and how these at-risk groups can be characterized with the help of learning disposition data. It is our conjecture that establishing a chain of antecedent-consequence relationships starting from learning disposition, through student activity in e-tutorials and formative assessment performance, to course performance, adds a crucial dimension to current learning analytics studies: that of profiling students with descriptors that easily lend themselves to the design of educational interventions

    Chinese International Student Campus Involvement and Friendship Network Patterns in the United States

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    In 2013, Chinese students are the largest group of international students in the United States, with over 230,000 Chinese students comprising more than 28% of America's international student population. One common assumption is that Chinese international students are not integrating with their host campus communities. This study examines two key areas in Chinese student campus integration: involvement in organizations and friendship network patterns. In particular, the influences of perceived English language ability and perceived cultural understanding of the United States are explored, along with their correlations with involvement and social networks. Chinese student involvement and friendships with the American host population are also compared to overall satisfaction with their university experience and their sense of belonging at the institution. Results are based on three original research questionnaires that were administered to 74 first-year Chinese international students at the University of Kansas in the United States over the course of one academic year. The data also includes in-depth interviews with 15 of these students. Previous studies suggest that English language and cultural understanding influence student involvement. However, this study found that neither perceived English language ability nor perceived cultural understanding of the United States correlated with Chinese student participation in campus organizations or the number of friendships made with Americans. However, despite the lack of direct correlation, both variables were shown to influence the types of engagements that Chinese students have with organizations and their American peers. Participants in this study demonstrated relatively low levels of involvement with campus organizations and significantly fewer friendships with American students than with fellow Chinese students. Despite this, participants still demonstrated an overall contentment with their American university experience and showed a sense of belonging at their institution. One explanation for this could be that the Western cultural lens and assumptions often used to observe international student integration are culturally biased and, therefore, incomplete. This study suggests that Western notions of campus involvement and engagement might not fully translate to students from non-Western backgrounds
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