No abstract
The end-to-end delay (also referred to as latency) experienced by gaming users has a significant impact on the quality of online games. In this paper we concentrate on the delay introduced in access networks. This access network delay depends on the access technology used, the network load, the link rate configured on the access links (also referred to as the last mile link) and the size of the packets generated by the games. We characterize this access network delay by means of measurements. First, we focus on this delay in actually deployed access networks: dial-up, cable and Asymmetric Digital Subscriber Line (ADSL) access. In these access networks the access network delay shoots up as soon as the gaming user (or somebody else on the user's home network) saturates the user's last mile link with traffic generated by applications (e.g. web browser) other than the games. Therefore, we also characterize the access network delay in a laboratory set-up of a QoS-enabled ADSL network. In this set-up we show that it is possible to (logically) segregate the game traffic from the other traffic to such an extent that the game packets are not excessively delayed while at the same time a large part of the link capacity can be consumed by the other traffic.
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In this paper we describe our research on how to design for perceptive activity in artifacts in order for perceptual crossing between subject and artifact to happen. We base our research on the phenomenology of perception [19] and on ecological psychology [10]. Perceptual crossing is believed to be essential to share perception and thereby to feel involved in the situation [5,15]. We propose a theoretical model in which perceptive connections between user, artifact and event are presented. We designed an artifact to function as physical hypotheses [9] and show the design relevance of the model. In an experiment we investigate how the user's feeling of involvement is influenced in relation to differentiations of the proposed theoretical model. The results of our experiment show that indeed perceptual crossing between user and artifact influences the user's feeling of involvement with the artifact in their common space. We conclude with describing several design notions important for designing for perceptive activity in artifacts.
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