Exploring information delivery on a guided tour using mobile projection and visual markers

We present an in-the-wild user study (n=27) investigating the combination of two mobile technologies – picoprojectors and marker based information browsing. We studied a tour, where the tour guide used combinations of fixed and projected elements to present information, and compare four cases: A) as a baseline, a traditional paper poster, B) a projected poster, C) a printed paper fiducial marker, viewed through a mobile device browser application, and D) a projected fiducial marker viewed through a mobile device browser application. As a contribution, we present a novel approach to ad hoc projection of markers, and the findings of the user study. Here, the salient findings suggest that the techniques using markers have the potential to enhance the tour participants’ engagement with the tour guide, attention, group cohesion and responsiveness to contextual factors, but face practical challenges due to lighting conditions and image stability

Projected fiducial markers for dynamic content display on guided tours

In this paper, we present a novel interaction technique – combining mobile projection and visible, fiducial marker based information display. We vision it to be suitable for small groups e.g. for narrative playful experiences and guided on places, where physical tags would be disturbing. This interaction technique, where one person (guide) is projecting a marker and other users can read it with their mobile devices, enables in situ information delivery while the guide can control the dynamics of the situation. We present an example use case of using the interaction technique on a guided tour, and a preliminary results from the user evaluatio

Generation, localization and functions of macrophages during the development of testis

In the testis, interstitial macrophages are thought to be derived from the yolk sac during fetal development, and later replaced by bone marrow-derived macrophages. By contrast, the peritubular macrophages have been reported to emerge first in the postnatal testis and solely represent descendants of bone marrow-derived monocytes. Here, we define new monocyte and macrophage types in the fetal and postnatal testis using high-dimensional single-cell analyses. Our results show that interstitial macrophages have a dominant contribution from fetal liver-derived precursors, while peritubular macrophages are generated already at birth from embryonic precursors. We find that bone marrow-derived monocytes do not substantially contribute to the replenishment of the testicular macrophage pool even after systemic macrophage depletion. The presence of macrophages prenatally, but not postnatally, is necessary for normal spermatogenesis. Our multifaceted data thus challenge the current paradigms in testicular macrophage biology by delineating their differentiation, homeostasis and functions. The developmental origins and functions of testis macrophages remain incompletely characterized. Here, the authors show, using histology, high-dimensional mass cytometry and cell fate-mapping data, that interstitial and peritubular macrophages originate from distinct precursors and contribute distinctly to spermatogenesis