This paper describes the concept and the realisation of a research prototype of a haptic environment that is enhanced with sound feedback to impart implicit knowledge and to teach motor skills to trainees. The sound feedback is to be understood as an additional feedback that provides information to the trainee about his or her actions in relation to objects in a virtual haptic environment. Alth...

In this paper, we focus on the situation of a typical e-commerce portal employing personalized recommendation. Such website could, in addition to the explicit feedback, monitor many different patterns of implicit user behavior – implicit factors. The problem arises while trying to infer connections between observed implicit behavior and user preferences while some connections are obvious, other...

We provide a comprehensive assessment of the relationship between public debt and GDP growth in the postwar advanced economies. We use the timing of changes in public debt and growth to account for endogeneity, and find little evidence of a negative relationship. Semi-parametric estimates do not indicate any threshold effects. Finally, we reconcile our results with four recent, influential pape...

In an implicit combinatorial optimization problem, the constraints are not enumerated explicitly but rather stated implicitly through equations, other constraints or auxiliary algorithms. An important subclass of such problems is the implicit set cover (or, equivalently, hitting set) problem in which the sets are not given explicitly but rather defined implicitly. For example, the well-known mi...

Four experiments examined the hypothesis that individuals who hold discrepant implicit and explicit self-esteem possess relatively strong self-image concerns. As a result, they may act irrationally when expressing sexual health attitudes. In support of the hypothesis, Experiments 1a and 1b demonstrate that large self-esteem discrepancy participants possess strong implicit self-image ambivalence...