Lower limb stiffness estimation during running: the effect of using kinematic constraints in muscle force optimization algorithms

The focus of this paper is on the effect of muscle force optimization algorithms on the human lower limb stiffness estimation. By using a forward dynamic neuromusculoskeletal model coupled with a muscle short-range stiffness model we computed the human joint stiffness of the lower limb during running. The joint stiffness values are calculated using two different muscle force optimization procedures, namely: Toque-based and Torque/Kinematic-based algorithm. A comparison between the processed EMG signal and the corresponding estimated muscle forces with the two optimization algorithms is provided. We found that the two stiffness estimates are strongly influenced by the adopted algorithm. We observed different magnitude and timing of both the estimated muscle forces and joint stiffness time profile with respect to each gait phase, as function of the optimization algorithm used

Transitions to the Knowledge Economy in Germany, Sweden and the Netherlands

The “digital revolution” that began in the late 1960s has transformed product markets and production processes in rich democracies. Observers depict the changes underway as a transition from the Fordist industrial economy to a new “knowledge economy,” characterized by rapid technological innovation and associated with a heightened premium on higher education.1 Although the challenges of this transition are broadly similar across the rich democracies, individual countries have navigated the course differently

Ressenyes

Obra ressenyada: Eugene A. NIDA, Fascinated by Languages. Amsterdam/Philadelphia: John Benjamins Publishing Company, 2003

Advanced Visualization and Interaction Techniques for Large High-Resolution Displays

Large high-resolution displays combine the images of multiple smaller display devices to form one large display area. A total resolution that can easily comprise several hundred megapixels makes them suited for the visualization of data sets that could not be perceived entirely on desktop PCs or laptops due to their size. At the same time, user collaboration benefits from an extended screen area that facilitates interaction with screen contents as well as interaction among users. This paper discusses the challenges and opportunities of large high-resolution displays and examines ways to set up display clusters both in terms of hardware and underlying software technology. Furthermore, it investigates how to effectively harness the computational power and resources of rendering clusters to visualize giga-scale data sets. Last but not least, traditional interaction metaphors and their scalability to large displays as well as the effect of new techniques on the user experience are discussed

Analysis of the potential of virtual stores for german online grocery retailing

Research Problem – The effects of digitalization had a huge impact on people’s everyday life. With increased use of internet, E-Commerce became hugely popular and pressurized classic brick and mortar retailers. However, the grocery market is one of the few markets without a remarkable share of online sales. Recently various players entered the small but promising market. Still, it is not foreseeable which player and which kind of sales approach will prevail and retailers are searching for innovative, business approaches that help customers to find their way into online grocery shops. Tesco carried out one propitious sales approach – they established Virtual Stores in Metro Stations where commuters could shop for their groceries on their way to work including a convenient delivery after finishing time. Purpose of the Study – This dissertation strives to identify the potential of Tesco’s Virtual Stores approach for commercial uses in German online and mobile grocery retailing and determines if there is an adequate target group, which is likely to use Virtual Stores to do their everyday grocery shopping. In addition, another aim is to understand the motivation of consumers to use Virtual Stores and to develop a model in order to predict their behaviour. Design/Methodology/Approach – A quantitative baseline study (n=259) is stating the basis of the present study, in order to test the research hypothesis grounded on a literature review of secondary research. Descriptive, bivariate and multivariate analysis have been accomplished to infer meaningful results. Findings/Implications – There is a high number of potential Virtual Stores users among the respondents. Their Behavioural Intention to use Virtual Stores can be measured by their perception of the performance of Virtual Stores, the degree to which they think shopping with Virtual Stores is fun, the degree to which they perceive online grocery shopping is common, their personal openness towards new information technology and their involvement concerning grocery shopping.Research Problem – Os efeitos da digitalização tiveram um enorme impacto na vida quotidiana das pessoas. Com o aumento da utilização da Internet, E-Commerce tornou-se imensamente popular e colocou os retailers sob pressão. No entanto, o mercado de mercearia é um dos poucos mercados sem uma parte considerável de vendas on-line. Recentemente vários competidores entraram neste mercado pequeno, mas promissor. Ainda assim, não é previsível que concorrente e que tipo de abordagem de vendas vai prevalecer e os retailers estão a procurar abordagens de negócios inovadoras, que ajudem os clientes a encontrar o seu caminho em mercearias on-line. Tesco realizou uma abordagem de vendas propícia - eles estabeleceram lojas virtuais em estações de metro, onde os passageiros poderiam fazer as compras dos seus mantimentos no seu caminho para o trabalho, incluindo a conveniente entrega após o seu fim. Objetivo do estudo – Esta dissertação procura identificar o potencial da abordagem das Lojas Virtuais da Tesco, para usos comerciais no retail online e móvel Alemão; e determinar se existe um grupo-alvo adequado, que seja provável de usar lojas virtuais para fazer suas compras de supermercado do quotidiano. Além disso, outro objetivo é entender a motivação do consumidor para usar lojas virtuais e desenvolver um modelo para prever seu comportamento. Constatações / Implicações - Existe um elevado número de potenciais utilizadores de lojas virtuais entre os entrevistados. A sua intenção comportamental de usar lojas virtuais pode ser medida pela sua percepção do desempenho de lojas virtuais, o grau em que acham que fazer compras com lojas virtuais é divertido, o grau em que percebem que fazer compras de supermercado on-line é comum, a sua abertura pessoal para nova Tecnologia da Informação (IT) e o seu envolvimento no que diz respeito às compras de supermercado. Projeto / Metodologia / Abordagem - Estudo quantitativo de base de (n = 259) está a estabelecer o ponto de partida do presente estudo a fim de testar a hipótese de pesquisa fundamentada numa revisão de literatura de pesquisa secundária. Análise descripitva, bivariada e multivariada foram efetuadas de modo a inferir resultados significativo