Creation of virtual worlds from 3D models retrieved from content aware networks based on sketch and image queries

The recent emergence of user generated content requires new content creation tools that will be both easy to learn and easy to use. These new tools should enable the user to construct new high-quality content with minimum effort; it is essential to allow existing multimedia content to be reused as building blocks when creating new content. In this work we present a new tool for automatically constructing virtual worlds with minimum user intervention. Users can create these worlds by drawing a simple sketch, or by using interactively segmented 2D objects from larger images. The system receives as a query the sketch or the segmented image, and uses it to find similar 3D models that are stored in a Content Centric Network. The user selects a suitable model from the retrieved models, and the system uses it to automatically construct a virtual 3D world

Music Teachers’ Perceptions of, and approaches to,Creativity in the Greek-Cypriot Primary Education

TThe purpose of this study was to explore music teachers' perceptions of, and approaches to, creativity in Primary education. Even though teachers' perceptions on creativity have been investigated broadly and extensively, qualitative research on music teachers' beliefs nurturing the students' creativity in Primary education are less common. In the present paper, data were collected through in-depth interviews with 10 individuals in the Greek-Cypriot Primary Education. The results of this exploratory study indicated that activities should include the promotion of the students' self-action and autonomy, and the pedagogical initiatives that enable students to come up with original outputs in order to be creative. This understanding, in turn, provided the researchers with access to the teacher participants' perceptions of creativity: a multifaceted concept related to students' autonomy, initiative, and the application of imagination and unrestrained thinking to any musical activity. These findings offer some initial insights and are discussed with respect to their implications for policy and practice. Suggestions for future research are also made

Dimensional analysis of the earthquake-induced pounding between inelastic structures

In this paper the seismic response of inelastic structures with unilateral contact is revisited with dimensional analysis. All physically realizable contact types are captured via a non-smooth complementarity approach. The implementation of formal dimensional analysis leads to a condensed presentation of the response and unveils remarkable order even though two different types of non-linearity coexist in the response: the boundary non-linearity of unilateral contact and the inelastic behaviour of the structure itself. It is shown that regardless the intensity and frequency content of the excitation, all response spectra become self-similar when expressed in the appropriate dimensionless terms. The proposed approach hinges upon the notion of the energetic length scale of an excitation which measures the persistence of ground shaking to impose deformation demands. Using the concept of persistency which is defined for excitations with or without distinct pulses, the response is scaled via meaningful novel intensity measures: the dimensionless gap and the dimensionless yield displacement. The study confirms that contact may have a different effect on the response displacements of inelastic structures depending on the spectral region. In adjacent inelastic structures, such as colliding buildings or interacting bridge segments, contact is likely to alter drastically the excitation frequencies’ at which the system is most vulnerable. Finally, it is shown that the proposed approach yields maximum response displacements which correlate very well with the persistency of real earthquakes for a bridge system with considerably complex behaviour

Dimensional analysis of yielding and pounding structures for records without distinct pulses

The seismic response of two fundamental mechanical configurations of earthquake engineering, the elastic–plastic system and the pounding oscillator, is revisited with the aid of dimensional analysis. Starting from the previous work of the authors which focused on pulse-type excitations, the paper offers an alternative, yet physically motivated, way to present the response of yielding and pounding structures under excitations with arbitrary time history. It is shown, that when the appropriate time and length scales are adopted, dimensional analysis can be implemented and remarkable order emerges in the response. Regardless of the acceleration level and frequency content of the excitation, all response spectra become self-similar and when expressed in dimensionless terms, resulting from dimensional analysis, follow a single master curve. The study proposes such scales together with the associated selection criteria among the available in literature strong ground motion parameters and shows that the proposed approach reduces drastically the scatter in the response

Anomalous transient amplification of waves in non-normal photonic media

Dissipation is a ubiquitous phenomenon in dynamical systems encountered in nature because no finite system is fully isolated from its environment. In optical systems, a key challenge facing any technological application has traditionally been the mitigation of optical losses. Recent work has shown that a new class of optical materials that consist of a precisely balanced distribution of loss and gain can be exploited to engineer novel functionalities for propagating and filtering electromagnetic radiation. Here we show a generic property of optical systems that feature an unbalanced distribution of loss and gain, described by non-normal operators, namely that an overall lossy optical system can transiently amplify certain input signals by several orders of magnitude. We present a mathematical framework to analyze the dynamics of wave propagation in media with an arbitrary distribution of loss and gain and construct the initial conditions to engineer such non-normal power amplifiers. Our results point to a new design space for engineered optical systems employed in photonics and quantum optics.Comment: 11 pages, 11 figure

Use of Equivalent Hermitian Hamiltonian for PTPT-Symmetric Sinusoidal Optical Lattices

We show how the band structure and beam dynamics of non-Hermitian $PT$-symmetric sinusoidal optical lattices can be approached from the point of view of the equivalent Hermitian problem, obtained by an analytic continuation in the transverse spatial variable $x$. In this latter problem the eigenvalue equation reduces to the Mathieu equation, whose eigenfunctions and properties have been well studied. That being the case, the beam propagation, which parallels the time-development of the wave-function in quantum mechanics, can be calculated using the equivalent of the method of stationary states. We also discuss a model potential that interpolates between a sinusoidal and periodic square well potential, showing that some of the striking properties of the sinusoidal potential, in particular birefringence, become much less prominent as one goes away from the sinusoidal case.Comment: 11 pages, 8 figure

Leadership Lessons: Building and Nurturing a High‐Performing Clinical Research Team

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/145296/1/jgs15352_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/145296/2/jgs15352.pd

Examining Corporate Litigation: Market Reactions, Resource Allocation, and Trial Outcomes

This dissertation aims to provide a preliminary examination of corporate litigation using a unique hand-collected sample of 262 corporate lawsuits involving 72 publicly-traded organizations listed on the Toronto Stock Exchange. The first set of studies explores how the market reacts when organizations go to court to resolve a lawsuit. Unlike previous U.S.-focused studies, no significant relation between abnormal market returns, the trial, and the subsequent court decision was found. These results suggest that the Canadian stock market, on average, does not perceive litigation as a significant event. The second set of studies explores how financial resources, in-house litigation ability and the chief legal officer interact to increase the organization\u27s odds of winning the trial. Results did not support the hypotheses that trial outcomes are influenced by the financial size of the organization nor by the in-house litigation ability. However, there was evidence that the relationship between an organization\u27s financial resources and the odds of winning were mediated by the internal litigation ability. Since the direct effects were non-significant, this result should be considered with caution. The hypothesis of a moderating relationship between the CLO and in-house litigation ability was not supported; instead, evidence of a (weak) interaction was found between these two variables. The findings from both sets of studies challenge the economic model of litigation that is predominant in the management literature. Recommendations for future research include extending the sample to include decisions from administrative tribunals and during the process to develop a better understanding of how organizations mobilize the legal system to improve organizational performance