Mark de Graaf

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This article investigates issues of controlling the amount of time during computer game play and potential solutions to help prevent excessive gaming. The study incorporates the realization of three different variants. Two screen based solutions and one based on a physical agent, outside the computer screen, provide notification and additionally even "(More)
In this paper we present the interactive play environment GlowSteps. GlowSteps consists of ten flexible tiles that respond with light feedback on player's actions. The play environment is developed to support both social and physical play and is designed with the intention to encourage children to create their own play and games. The tiles can be programmed(More)
Play is an unpredictable and fascinating activity. Its qualities can serve as an inspiration for design. In designing for play, we focus on play environments with players and multiple interactive objects. The current understanding of how to design these objects and interaction opportunities to create meaningful interactions and engaging user experiences is(More)
In this paper we describe a study in which we examine how children play with an interactive open-ended play installation. The idea behind open-ended play solutions is that children can create their own game goals and rules. However, what design parameters help children in being able to do this? Challenges include how to get children started with creating(More)
The distribution of phospholipid and cholesterol between the vesicular and micellar phases in bile plays an important role in the formation of cholesterol gallstones. Conventional analytical procedures to determine the distribution are potentially unreliable because they disturb the distribution of these compounds between the two phases. In this work, we(More)
This paper presents a design case of an interactive zoomorphic play object for open-ended pretend play, based on De Valk's three stages of play framework. It was designed to invoke pretend play around a sleeping object. Design iterations were tested in a public play environment. 1 Introduction A sleeping being – animal, human-is intriguing for many(More)
Dear participant, We are happy to receive you at the 3rd Welcome the Wireless World (W3) workshop held on 27 Sep 2011. We hope that you will enjoy the programme as well as the personal contact with other researchers. This edition of the workshop offers you a diverse programme with topics spanning from sensor networks to vehicular applications with different(More)