Stihl (Germany)

In the development of resource-efficient and user-centered power tools, it is essential to identify a set of operating points corresponding to specific work processes, as performed under real-world field conditions. For power tools like chainsaws, the operating point is influenced by the applied load, which results from the interaction between the machine, the work piece, and — most critically — the user’s behavior. To effectively support the development through a digital twin (DT) prototype, it is vital to incorporate the human factor into the digital model. Current research lacks straightforward methods for modeling user behavior. Most existing literature focuses either on the DT of the product itself or on complex, large-scale approaches to modeling human behavior. This article explores the integration of a human controller (HC) framework into the DT environment for power tools. The objective is to generate added value in the early stages of the product life cycle with minimal effort, while also enabling a more detailed representation of a human twin. As a case study, the use of a chainsaw during the processing of a felled tree is examined. Relevant human behavioral characteristics are identified through empirical measurements. The functionality of the integrated HC is then verified within the DT prototype.

Influencer*innen in den sozialen Medien sprechen ihre Fans auf persönlicher Ebene an, denn nur so sind ihre Produktempfehlungen glaubwürdig. Doch inwiefern thematisieren sie dabei auch das Gender ihrer Follower*innen? Anastasia-Patricia Och liefert Einblicke in die multimodale Gestaltung von YouTube-Videos erfolgreicher Influencer*innen und in die Mediennutzung Jugendlicher, die sowohl während als auch nach der Rezeption gegenderte Praktiken umfasst. Im Fokus ihrer parainteraktiven und genderbezogenen Analyse stehen Beauty-Videos und FIFA-Let's-Plays. Außerdem kommen Jugendliche zu ihren Erfahrungen mit diesen Formaten und ihrem eigenen Umgang mit YouTube zu Wort.

The goal of our research work is to establish mesenchymal osteoprogenitors derived from human jaw periosteum for tissue engineering applications in oral and maxillofacial surgery. For future autologous and/or allogeneic transplantations, some issues must be addressed. On the one hand, animal-free culture conditions have yet to be established. On the other hand, attempts should be undertaken to shorten the in vitro culturing process efficiently. The aim of the present study is to compare and analyze the phenotype of osteoprogenitors from the jaw periosteum under normal FCS-containing and animal-free culture conditions. Therefore, we analyzed the proliferation rates of MesenCult-XF medium (MC-) in comparison to DMEM-cultured JPCs. Whereas jaw periosteal cells (JPCs) show relatively slow proliferation rates and a fibroblastoid shape under DMEM culture conditions, MC-cultured JPCs diminished their cell size significantly and proliferated rapidly. By live-monitoring measurements of adhesion and proliferation, we made an interesting observation: whereas the proliferation of the MSCA-1+ subpopulation and the unseparated cell fraction were favored by the animal-free culture medium, the proliferation of the MSCA-1- subpopulation seemed to be repressed under these conditions. The alkaline phosphatase expression pattern showed similar results under both culture conditions. Comparison of the mineralization capacity revealed an earlier formation of calcium-phosphate precipitates under MC culture conditions; however, the mineralization capacity of the DMEM-cultured cells seemed to be higher. We conclude that the tested animal-free medium is suitable for the in vitro expansion and even for the specific selection of osteoprogenitor cells derived from the jaw periosteum.