5,416 research outputs found
Interactive Art To Go
Traditional artworks like paintings, photographs, or films can be reproduced
by conventional media like printing or video. This makes visitors of museums
possible to purchase postcards, posters, books, and DVDs of pictures and/or
movies shown at the exhibition. However, newly developing arts so called
interactive art, or new media art, has not been able to be reproduced due to
limitation of functionalities of the conventional media. In this article, the
authors report a novel approach of sharing such interactive art outside the
exhibition, so that the visitors of the museum can take a copy to home, and
even share it with non-visitors. The authors build up their new
projector-and-camera (ProCam) based interactive artwork for exhibition at
Museum of Contemporary Art Tokyo (MOT) by using Apple's iPhone. The exactly
same software driving this artwork was downloadable from Apple's App Store --
thus all visitors or even non-visitors could enjoy the same experience at home
or wherever they like
Spin Berry phase in anisotropic topological insulators
Three-dimensional topological insulators are characterized by the presence of
protected gapless spin helical surface states. In realistic samples these
surface states are extended from one surface to another, covering the entire
sample. Generally, on a curved surface of a topological insulator an electron
in a surface state acquires a spin Berry phase as an expression of the
constraint that the effective surface spin must follow the tangential surface
of real space geometry. Such a Berry phase adds up to pi when the electron
encircles, e.g., once around a cylinder. Realistic topological insulators
compounds are also often layered, i.e., are anisotropic. We demonstrate
explicitly the existence of such a pi Berry phase in the presence and absence
(due to crystal anisotropy) of cylindrical symmetry, that is, regardless of
fulfilling the spin-to-surface locking condition. The robustness of the spin
Berry phase pi against cylindrical symmetry breaking is confirmed numerically
using a tight-binding model implementation of a topological insulator nanowire
penetrated by a pi-flux tube.Comment: 9 pages, 4 figures (6 panels
Characterization of well-posedness of piecewise linear systems
One of the basic issues in the study of hybrid systems is the well-posedness (existence and uniqueness of solutions) problem of discontinuous dynamical systems. The paper addresses this problem for a class of piecewise-linear discontinuous systems under the definition of solutions of Caratheodory. The concepts of jump solutions or of sliding modes are not considered here. In this sense, the problem to be discussed is one of the most basic problems in the study of well-posedness for discontinuous dynamical systems. First, we derive necessary and sufficient conditions for bimodal systems to be well-posed, in terms of an analysis based on lexicographic inequalities and the smooth continuation property of solutions. Next, its extensions to the multimodal case are discussed. As an application to switching control, in the case that two state feedback gains are switched according to a criterion depending on the state, we give a characterization of all admissible state feedback gains for which the closed loop system remains well-pose
Characterization of well-posedness of piecewise linear systems
One of the basic issues in the study of hybrid systems is the well-posedness (existence and uniqueness of solutions) problem of discontinuous dynamical systems. This paper addresses this problem for a class of piecewise-linear discontinuous systems under the definition of solutions of Carath\'eodory. The concepts of jump solutions or a sliding mode are not considered here. In this sense, the problem to be discussed is one of the most basic problems in the study of well-posedness for discontinuous dynamical systems. First, we derive necessary and sufficient conditions for bimodal systems to be well-posed, in terms of an analysis based on lexicographic inequalities and the smooth continuation property of solutions. Next, its extensions to the multi-modal case are discussed. As an application to switching control, in the case that two state feedback gains are switched according to a criterion depending on the state, we give a characterization of all admissible state feedback gains for which the closed loop system remains well-posed. \u
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