Physiological and cognitive measures during prolonged sitting: Comparisons between a standard and multi-axial office chair

Prolonged sitting, common in many workplaces, reduces blood flow to the lower limb and has negative health outcomes. CoreChair is an active-sitting chair that encourages increased movement to help mitigate these outcomes. Physiological and cognitive measures were recorded in ten participants over four hours of sitting in both the CoreChair and a traditional office chair. Sitting in both chairs led to increases in calf circumference (p<0.0001), reduced tactile sensitivity (p=0.02), and a cognitive decline in attention (p=0.035) over time. However, the increase in calf circumference was smaller in the CoreChair at the second (p= 0.017) and third hour (p= 0.012) compared to the traditional chair. Additionally, for the attention task, the traditional chair generated more attention-task errors (p=0.005), while no changes were observed with the CoreChair (p=0.13). These findings suggest that during prolonged sitting CoreChair may have modest physiological and cognitive benefits compared to a traditional chair

Exploring the Geographical Relations Between Social Media and Flood Phenomena to Improve Situational Awareness

Recent research has shown that social media platforms like twitter can provide relevant information to improve situation awareness during emergencies. Previous work is mostly concentrated on the classification and analysis of tweets utilizing crowdsourcing or machine learning techniques. However, managing the high volume and velocity of social media messages still remains challenging. In order to enhance information extraction from social media, this chapter presents a new approach that relies upon the geographical relations between twitter data and flood phenomena. Our approach uses specific geographical features like hydrological data and digital elevation models to prioritize crisis-relevant twitter messages. We apply this approach to examine the River Elbe Flood in Germany in June 2013. The results show that our approach based on geographical relations can enhance information extraction from volunteered geographic information, thus being valuable for both crisis response and preventive flood monitoring