Quality management in service ecosystems

Service-oriented architectures and Web services mature and have become more widely accepted and used by industry. This growing adoption increased the demands for new ways of using Web service technology. Users start re-combining and mediating other providers’ services in ways that have not been anticipated by their original provider. Within organisations and cross-organisational communities, discoverable services are organised in repositories providing convenient access to adaptable end-to-end business processes. This idea is captured in the term Service Ecosystem. This paper addresses the question of how quality management can be performed in such service ecosystems. Service quality management is a key challenge when services are composed of a dynamic set of heterogeneous sub-services from different service providers. This paper contributes to this important area by developing a reference model of quality management in service ecosystems. We illustrate the application of the reference model in an exploratory case study. With this case study, we show how the reference model helps to derive requirements for the implementation and support of quality management in an exemplary service ecosystem in public administration.     

Reticulated Porous Foam Ceramics with Different Surface Chemistries

The aim of this study was to discuss the influence of different filter surface chemistries on the properties of foam filters. For reliable results, it is essential to ensure comparable structural properties (cell size and strut thickness) for all different surface chemistries (Al₂O₃, MgAl₂O₄, 3Al₂O₃·2SiO₂, SiO₂, and TiO₂) possess the same structural properties (cell size and strut thickness). Filters made of 100% of the investigated materials and alumina skeletons coated with the investigated materials were prepared. The coated alumina samples were sintered in one and two steps. The processing route with two sintering steps resulted in improved mechanical properties and comparable shrinkage and strut thickness. The 100% bulk foams possessed different pore sizes due to the differences of the material shrinkage. In this study, a comparison of the experimental investigated properties of the ceramic foam filters and the theoretically calculated values for foam materials derived from the bulk material properties is established.     

Horton and Wohl Revisited: Exploring Viewers' Experience of Parasocial Interaction

Linking back to D. Horton and R. Wohl (1956) , the present approach conceptualizes and empirically examines viewers' parasocial interaction experience with a TV performer. Causes and outcomes of parasocial interaction experience are examined. To this end, a new Experience of Parasocial Interaction (EPSI) scale is introduced. In a 2 (Bodily Addressing) × 2 (Verbal Addressing) between‐subjects experiment (N = 198) viewers reported a more intense parasocial experience if they were addressed by a TV performer on a bodily and verbal level. In addition, the more viewers perceived the performer to be attractive and the stronger their perspective‐taking ability, the more intense their parasocial experience. Stronger parasocial experience resulted in higher commitment to social norms and a greater enjoyment of the exposure situation.     

It's Okay to Shoot a Character: Moral Disengagement in Violent Video Games

What makes virtual violence enjoyable rather than aversive? Two 2×2 experiments tested the assumption that moral disengagement cues provided by a violent video game's narrative and game play lessen users' guilt and negative affect, which would otherwise undermine players' enjoyment of the game. Experiment 1 found that users' familiarity with the violent game reduced guilt and negative affect, and enhanced enjoyment, whereas opponents' nonhuman outer appearance and blameworthiness had no effect. Experiment 2 found that fighting for a just purpose, perceiving less mayhem, and framing the overall situation as “just a game” or “just an experiment” reduced guilt and negative affect, whereas the distorted portrayal of consequences did not. Effects on game enjoyment were mixed and suggest that moral disengagement cues may both foster and diminish game enjoyment.     

Parallel dynamic and kinetic regular triangulation in three dimensions

A parallel algorithm for regular triangulations is presented. For the purpose of fully dynamic and kinetic particle simulations it allows vertex insertion, deletion, movement, and weight changes. We describe new algorithms for incremental construction of regular triangulations, parallel vertex deletion and insertion. Finally, a parallel Lawson flip algorithm for vertex displacements is presented. The performance analysis demonstrates a significant parallel efficiency for various system sizes and performed changes.     

A Novel Nanoprobe for Multimodal Imaging Is Effectively Incorporated into Human Melanoma Metastatic Cell Lines

To facilitate efficient drug delivery to tumor tissue, several nanomaterials have been designed, with combined diagnostic and therapeutic properties. In this work, we carried out fundamental in vitro and in vivo experiments to assess the labeling efficacy of our novel theranostic nanoprobe, consisting of glycogen conjugated with a red fluorescent probe and gadolinium. Microscopy and resazurin viability assays were used to study cell labeling and cell viability in human metastatic melanoma cell lines. Fluorescence lifetime correlation spectroscopy (FLCS) was done to investigate nanoprobe stability. Magnetic resonance imaging (MRI) was performed to study T₁ relaxivity in vitro, and contrast enhancement in a subcutaneous in vivo tumor model. Efficient cell labeling was demonstrated, while cell viability, cell migration, and cell growth was not affected. FLCS showed that the nanoprobe did not degrade in blood plasma. MRI demonstrated that down to 750 cells/μL of labeled cells in agar phantoms could be detected. In vivo MRI showed that contrast enhancement in tumors was comparable between Omniscan contrast agent and the nanoprobe. In conclusion, we demonstrate for the first time that a non-toxic glycogen-based nanoprobe may effectively visualize tumor cells and tissue, and, in future experiments, we will investigate its therapeutic potential by conjugating therapeutic compounds to the nanoprobe.     

Optimierung eines laserunterstützten Wickelverfahrens für thermoplastische Prepregrovings mit Hilfe der statistischen Versuchsmethodik

Forschung im Ingenieurwesen - Mit Hilfe der statistischen Versuchsmethodik wird der laserunterstützte Wickelprozeß kohlenstoffaserverstärkter thermoplastischer Prepregrovings...