@article{JoblinMauerer, author = {Joblin, Mitchell and Mauerer, Wolfgang}, title = {An Interactive Survey Framework for Validation of Social Network Analysis}, series = {The R Journal}, volume = {8}, journal = {The R Journal}, number = {1}, pages = {149 -- 158}, abstract = {Abstract Social network analysis is extremely well supported by the R community and is routinely used for studying the relationships between people engaged in collaborative activities. While there has been rapid development of new approaches and metrics in this field, the challenging question of validity (how well insights derived from social networks agree with reality) is often difficult to address. We propose the use of several R packages to generate interactive surveys that are specifically well suited for validating social network analyses. Using our web-based survey application, we were able to validate the results of applying community-detection algorithms to infer the organizational structure of software developers contributing to open-source projects.}, language = {en} } @article{GensleinHauslerKirchneretal., author = {Genslein, Christa and Hausler, Peter and Kirchner, Eva-Maria and Bierl, Rudolf and Baeumner, Antje J. and Hirsch, Thomas}, title = {Graphene-enhanced plasmonic nanohole arrays for environmental sensing in aqueous samples}, series = {Beilstein Journal of Nanotechnology}, volume = {7}, journal = {Beilstein Journal of Nanotechnology}, publisher = {Beilstein-Institut}, doi = {10.3762/bjnano.7.150}, pages = {1564 -- 1573}, abstract = {The label-free nature of surface plasmon resonance techniques (SPR) enables a fast, specific, and sensitive analysis of molecular interactions. However, detection of highly diluted concentrations and small molecules is still challenging. It is shown here that in contrast to continuous gold films, gold nanohole arrays can significantly improve the performance of SPR devices in angle-dependent measurement mode, as a signal amplification arises from localized surface plasmons at the nanostructures. This leads consequently to an increased sensing capability of molecules bound to the nanohole array surface. Furthermore, a reduced graphene oxide (rGO) sensor surface was layered over the nanohole array. Reduced graphene oxide is a 2D nanomaterial consisting of sp2-hybridized carbon atoms and is an attractive receptor surface for SPR as it omits any bulk phase and therefore allows fast response times. In fact, it was found that nanohole arrays demonstrated a higher shift in the resonance angle of 250-380\% compared to a continuous gold film. At the same time the nanohole array structure as characterized by its diameter-to-periodicity ratio had minimal influence on the binding capacity of the sensor surface. As a simple and environmentally highly relevant model, binding of the plasticizer diethyl phthalate (DEP) via π-stacking was monitored on the rGO gold nanohole array realizing a limit of detection of as low as 20 nM. The concentration-dependent signal change was studied with the best performing rGO-modified nanohole arrays. Compared to continuous gold films a diameter-to-periodicity ratio (D/P) of 0.43 lead to a 12-fold signal enhancement. Finally, the effect of environmental waters on the sensor was evaluated using samples from sea, lake and river waters spiked with analytically relevant amounts of DEP during which significant changes in the SPR signal are observed. It is expected that this concept can be successfully transferred to enhance the sensitivity in SPR sensors.}, language = {en} } @article{HauserHerrmann, author = {Hauser, Christian and Herrmann, Frank}, title = {Optimierung der Materialbereitstellung in der Fertigung nach Lean-Methoden in Anlehnung an das Kanban-Prinzip}, series = {Anwendungen und Konzepte der Wirtschaftsinformatik (AKWI)}, volume = {4}, journal = {Anwendungen und Konzepte der Wirtschaftsinformatik (AKWI)}, organization = {Arbeitskreis Wirtschaftsinformatik an Fachhochschulen}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-2049}, pages = {50 -- 54}, abstract = {Lean Management wurde in den letzten Jahren in den deutschen Produktionsbetrieben immer popul{\"a}rer. Die daraus resultierende Umstrukturierung bringt meist eine h{\"o}here Wirtschaftlichkeit, Produktivit{\"a}t und große Einsparpotenziale mit sich. Im Zuge dessen sollen bei der Produktion der K{\"u}hlbeh{\"a}lter (IsoTec) der Gebhardt Logistic Solutions GmbH in Cham Potenziale und Maßnahmen aufgedeckt werden, um die Prozesse zu verbessern. Großes Augenmerk liegt dabei, in der Anwendung eines der bekanntesten Methode des Lean Managements, dem Kanban-Prinzip, zur Optimierung der Materialbereitstellung, den Lagerbest{\"a}nden und den Durchlaufzeiten. Damit verbunden ist die Verk{\"u}rzung der Lieferzeiten gegen{\"u}ber dem Kunden. Durch die Nutzung der eigenen Kompetenzen rund um die Transportbeh{\"a}lterfertigung wird die Bereitstellung und der Transport der ben{\"o}tigten Materialien f{\"u}r die Montage neu geplant und umgesetzt.}, subject = {Lean Management}, language = {de} } @misc{OPUS4-276, title = {Angewandte Forschung in der Wirtschaftsinformatik: Prozesse, Technologien, Anwendungen, Systeme und Management}, editor = {Barton, Thomas and Herrmann, Frank and Meister, Vera and M{\"u}ller, Christian and Seel, Christian}, publisher = {mana-Buch}, address = {Heide}, organization = {Arbeitskreis Wirtschaftsinformatik an Fachhochschulen (AKWI)}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-2767}, subject = {Wirtschaftsinformatik}, language = {de} }