In this paper we describe a novel interaction method for interacting with mobile devices without the need to access a keypad or a display. A tap with a hand can be reliably detected e.g. through a pocket by means of an acceleration sensor. By carefully designing the user interface, the tap can be used to activate logically similar functionalities on the device, leading to a simple but useful interaction method. We present results of user tests aimed at studying the usability of various tap input based user interface applications.

TransPrint is a method for fabricating flexible, transparent free-form displays based on electrochromism. Using screen-printing or inkjet printing of electrochromic ink, plus a straightforward assembly process, TransPrint enables rapid prototyping of displays by nonexperts. The displays are nonlight-emissive and only require power to switch state and support the integration of capacitive touch sensing for interactivity. We present instructions and best practices on how to design and assemble the displays and discuss the benefits and shortcomings of the TransPrint approach. To demonstrate the broad applicability of the approach, we present six application prototypes.

Investigating the influence of external car displays on pedestrians' crossing behavior in virtual reality. In Proceedings of the 21st International Conference on Human-Computer Interaction with Mobile Devices and Services [27] Association for Computing Machinery, Inc.

The widespread popularity of Pokémon GO presents the first opportunity to observe the geographic effects of locationbased gaming at scale. This paper reports the results of a mixed methods study of the geography of Pokémon GO that includes a five-country field survey of 375 Pokémon GO players and a large scale geostatistical analysis of game elements. Focusing on the key geographic themes of places and movement, we find that the design of Pokémon GO reinforces existing geographically-linked biases (e.g. the game advantages urban areas and neighborhoods with smaller minority populations), that Pokémon GO may have instigated a relatively rare large-scale shift in global human mobility patterns, and that Pokémon GO has geographicallylinked safety risks, but not those typically emphasized by the media. Our results point to geographic design implications for future systems in this space such as a means through which the geographic biases present in Pokémon GO may be counteracted.

In this case study, the possibilities of hybrid integration of printed and flexible electronics in combination with conventional electronic components to create new types of product concepts is demonstrated. The final result is a personal activity meter demonstrator, which is realized by utilizing various flexible electronics manufacturing and integration techniques. Roll-to-roll printing was used to print the electronic backplane as well as co-planar electrochromic (EC) display. A pick-and-place assembled microcontroller unit and accelerometer, together with passive components, provided the brains for the system. Injection molding was then utilized to create a structural electronics system including an EC display. To validate the feasibility and scalability of the processes used, 100 pieces of the personal activity meter were fabricated. Modeling with continuum computational fluid dynamics and numerical heat transfer, using the high-performance finite volume method, showed that high filling pressure and shear-stress are the key factors causing broken devices. The stability of the devices in harsh environmental conditions as well as in bending seem to be slightly improved in the over molded samples. INDEX TERMS Electrochromic displays, injection molding, hybrid integration, printed electronics, structural electronics. TERHO KOLOLUOMA received the Ph.D. degree in chemistry from the University of Oulu in 2003. From 1998 to 1999, he was with the University of Oulu having a responsibility on fabrication and characterization of solgel-based materials. From 1999 to 2003, he was with VTT Electronics for developing new materials for optoelectronic applications. During that period, he started the first experiments in the area of roll-to-roll printed electronics and optoelectronics and started to lead various research project in that field. After finishing his Ph.D. thesis in 2003, he started as a Senior Scientist focusing on development of printed electronics components and technologies, and since 2010, he has a Principal Scientist. From 2013 to 2015, he was with National Research Council Canada, he is currently a Research Team Leader of printed electronics processing team with VTT. His main research topic is printable optics and electronics. Of his special interests are novel materials for printed electronics and materials-process interface.