Large Scale SfM with the Distributed Camera Model

We introduce the distributed camera model, a novel model for Structure-from-Motion (SfM). This model describes image observations in terms of light rays with ray origins and directions rather than pixels. As such, the proposed model is capable of describing a single camera or multiple cameras simultaneously as the collection of all light rays observed. We show how the distributed camera model is a generalization of the standard camera model and describe a general formulation and solution to the absolute camera pose problem that works for standard or distributed cameras. The proposed method computes a solution that is up to 8 times more efficient and robust to rotation singularities in comparison with gDLS. Finally, this method is used in an novel large-scale incremental SfM pipeline where distributed cameras are accurately and robustly merged together. This pipeline is a direct generalization of traditional incremental SfM; however, instead of incrementally adding one camera at a time to grow the reconstruction the reconstruction is grown by adding a distributed camera. Our pipeline produces highly accurate reconstructions efficiently by avoiding the need for many bundle adjustment iterations and is capable of computing a 3D model of Rome from over 15,000 images in just 22 minutes.Comment: Published at 2016 3DV Conferenc

Botivist: Calling Volunteers to Action Using Online Bots

To help activists call new volunteers to action, we present Botivist: a platform that uses Twitter bots to find potential volunteers and request contributions. By leveraging different Twitter accounts, Botivist employs different strategies to encourage participation. We explore how people respond to bots calling them to action using a test case about corruption in Latin America. Our results show that the majority of volunteers (>80%) who responded to Botivist's calls to action contributed relevant proposals to address the assigned social problem. Different strategies produced differences in the quantity and relevance of contributions. Some strategies that work well offline and face-to-face appeared to hinder people's participation when used by an online bot. We analyze user behavior in response to being approached by bots with an activist purpose. We also provide strong evidence for the value of this type of civic media, and derive design implications.Comment: 9 pages, 3 figures, CSCW'1

An Experimental Hybrid User Interface for Collaboration

We present EMMIE (Environment Management for Multi-user Information Environments), an experimental user interface to a collaborative augmented environment. Users share a 3D virtual space and manipulate virtual objects representing information to be discussed. This approach not only allows for cooperation in a shared physical space, but also addresses tele-collaboration in physically separate but virtually shared spaces. We refer to EMMIE as a hybrid user interface because it combines a variety of different technologies and techniques, including virtual elements such as 3D widgets, and physical objects such as tracked displays and input devices. See-through head-worn displays overlay the virtual environment on the physical environment. Our research prototype includes additional 2D and 3D displays, ranging from palm-sized to wall-sized, allowing the most appropriate one to be used for any task. Objects can be moved among displays (including across dimensionalities) through drag & drop. In analogy to 2D window managers, we describe a prototype implementation of a shared 3Denvironment manager that is distributed across displays, machines, and operating systems. We also discuss two methods we are exploring for handling information privacy in such an environment

What Theory Is and Can Be: Forms of Theorizing in Organizational Scholarship

Theory is at the very heart of organizational scholarship and a key criterion for evaluating the quality and contribution of our research. Focusing on conceptual rather than empirical work, this editorial essay highlights the wide range of forms that theorizing might take – and how it, in consequence, materializes in different types of theory papers. Next to the propositional form of theory building, which has so far dominated reflections in the literature, we discuss the particularities of process, configurational, perspectival, and meta-theorizing, as well as various forms of critique. We demonstrate how these forms of theorizing differ in terms of their aims, style of reasoning, their contributions, and the way in which they are written up as papers. In view of the rather different roles that each of these forms of theorizing serve, we propagate, in line with the ethos of Organization Theory, a pluralistic stance when it comes to advancing theory in organization studies. </jats:p

Leistungssport und österreichische Politik, Strukturen, Inhalte, Prozesse

Gegenständliche Arbeit zeigt den Zusammenhang zwischen Sport und Politik im österreichischen System

Pathophysiological consequences and benefits of HFE mutations: 20 years of research

Mutations in the HFE (hemochromatosis) gene cause hereditary hemochromatosis, an iron overload disorder that is hallmarked by excessive accumulation of iron in parenchymal organs. The HFE mutation p.Cys282Tyr is pathologically most relevant and occurs in the Caucasian population with a carrier frequency of up to 1 in 8 in specific European regions. Despite this high prevalence, the mutation causes a clinically relevant phenotype only in a minority of cases. In this review, we summarize historical facts and recent research findings about hereditary hemochromatosis, and outline the pathological consequences of the associated gene defects. In addition, we discuss potential advantages of HFE mutations in asymptomatic carriers

“Don’t drop the plane to fly the mic!” : designing for modern radiotelephony education in general aviation

Learning to fly an aeroplane is a challenging endeavour; mastering the radio, i.e. talking to air traffic control (ATC) is considered by many students as an especially daunting activity. Using the correct voice procedures and phraseology is paramount for a smooth and safe aircraft operation in busy airspaces. However, training new general aviation pilots in radiotelephony is still a largely manual activity, where students and teachers engage in role-play to mimic the different ends of communication. The design of an aeronautical chatbot, capable of simulating ATC would provide students with plenty of additional training opportunities that they can conduct on their own and at their own pace. A detailed analysis of the voice input would provide feedback on the learning process. This paper reports on the preliminary proof-of-feasibility prototype design as well as synthetic language model training data generation