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A B S T R A C TThis paper presents MobiSpray, a novel interactive art tool for creating ubiquitous ephemeral digital art. The mobile phone is employed as a virtual spray can to spray dabs of digital paint onto the physical environment via large-scale projections. The gesture-based control of the mobile phone provides a natural pointing mechanism for the virtual spray can. Experiences from extensive field use around the world testify in favor of a successful design. Most importantly, MobiSpray liberates and empowers the artist to change the environment via large-scale artistic expressions.

This paper introduces a novel and creative approach for coupling multimedia art with a non-conventional distributed humancomputer interface for multi-user interactive entertainment. The proposed MobiLenin system allows a group of people to interact simultaneously with a multi-track music video shown on a large public display using their personal mobile phones, effectively empowering the group with the joint authorship of the video. The system is realized with a client-server architecture which includes server-driven real-time control of the client UI to guarantee ease of use and a lottery mechanism as an incentive for interaction. Our analysis of the findings of an empirical user evaluation conducted in a true environment of use shows that the MobiLenin system is successful, addressing many of the challenges identified in the literature. The proposed system offers a new form of interactive entertainment for pubs and other public places, and the underlying architecture provides a framework for realizing similar installations with different types of multimedia content.

a B S T r a c T This paper presents MobiSpray, a novel interactive art tool for creating ubiquitous ephemeral digital art. The mobile phone is employed as a virtual spray can to spray dabs of digital paint onto the physical environment via large-scale projections. The gesture-based control of the mobile phone provides a natural pointing mechanism for the virtual spray can. experiences from extensive field use around the world testify in favor of a successful design. Most importantly, MobiSpray liberates and empowers the artist to change the environment via large-scale artistic expressions. introductionThis work stems from our desire to change, through digital art, the appearance of the physical environment to something different, unexpected, and unpredictable, but without inflicting any permanent or illicit damage. To achieve this, we developed the MobiSpray art tool for imposing large-scale ephemeral digital artistic projections on the environment. They serve as a vehicle for experiencing space and time in new ways, drawing inspiration from both the artistic process itself and the final artistic outcome. Figure 1. MobiSpray in action.

Electromigration (EM) is becoming a progressively severe reliability challenge due to increased interconnect current densities. A shift from traditional (post-layout) EM veri cation to robust (pro-active) EM-aware design-where the circuit layout is designed with individual EM-robust solutions-is urgently needed. This tutorial will give an overview of EM and its e ects on the reliability of present and future integrated circuits (ICs). We introduce the physical EM process and present its speci c characteristics that can be a ected during physical design. Examples of EM countermeasures which are applied in today's commercial design ows are presented. We show how to improve the EM-robustness of metallization patterns and we also consider mission pro les to obtain application-oriented current-density limits. The increasing interaction of EM with thermal migration is investigated as well. We conclude with a discussion of application examples to shift from the current post-layout EM veri cation towards an EM-aware physical design process. Its methodologies, such as EM-aware routing, increase the EM-robustness of the layout with the overall goal of reducing the negative impact of EM on the circuit's reliability.