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NexusDS: A flexible and extensible middleware for distributed stream processing 09

NexusDS: A flexible and extensible middleware for distribute...

引用

International Database Engineering and Applications Symposium, IDEAS'09

作者： Cipriani, Nazario Eissele, Mike Brodt, Andreas Grossmann, Matthias Mitschang, Bernhard Universität Stuttgart Institute of Parallel and Distributed Systems Universitätsstraße 38 70569 Stuttgart Germany Universität Stuttgart Institute for Visualization and Interactive Systems Universitätsstraße 38 70569 Stuttgart Germany

ISBN: (纸本)9781605584027

Techniques for efficient and distributed processing of huge, unbound data streams have made some impact in the database community. Sensors and data sources, such as position data of moving objects, continuously produce data that is consumed, e.g., by location-aware applications. Depending on the domain of interest, e.g. visualization, the processing of such data often depends on domain-specific functionality. This functionality is specified in terms of dedicated operators that may require specialized hardware, e.g. GPUs. This creates a strong dependency which a data stream processing system must consider when deploying such operators. Many data stream processing systems have been presented so far. However, these systems assume homogeneous computing nodes, do not consider operator deployment constraints, and are not designed to address domain-specific needs. In this paper, we identify necessary features that a flexible and extensible middleware for distributed stream processing of context data must satisfy. We present NexusDS, our approach to achieve these requirements. In NexusDS, data processing is specified by orchestrating data flow graphs, which are modeled as processing pipelines of predefined and general operators as well as custom-built and domain-specific ones. We focus on easy extensibility and support for domain-specific operators and services that may even utilize specific hardware available on dedicated computing nodes. Copyright 2009 ACM.

关键词： Information management

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Improving the accessibility of wikis

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11th International Conference on Computers Helping People with Special Needs, ICCHP 2008

作者： Taras, C. Siemoneit, O. Weißer, N. Rotard, M. Ertl, T. Institute for Visualization and Interactive Systems Institute of Philosophy Universitaet Stuttgart Germany

ISBN: (纸本)3540705392

During the last years wikis have become important information portals. Nevertheless, research in wiki accessibility is an often neglected topic. This paper takes a basic analytical and systematic step inside this new and complex area, explores the peculiarities, possibilities and limitations of wiki accessibility. Wikis give rise to certain accessibility limitations but also do offer new ways and concepts to improve accessibility. We present basic concepts and extensions to the wiki markup that are to our minds inevitable for improving the accessibility of wikis. It is pointed out, that wiki accessibility is not something totally new but mostly a complex conjunction of yet separated classical discussions. However there are also wiki specific accessibility aspects. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： Computers

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Dynamic shader generation for flexible multi-volume visualization

Dynamic shader generation for flexible multi-volume visualiz...

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2008 Pacific visualization Symposium, PacificVis 2008

作者： Rößler, Friedemann Botchen, Ralf P. Ertl, Thomas Institute for Visualization and Interactive Systems Universität Stuttgart Germany

ISBN: (纸本)9781424419661

Volume rendering of multiple intersecting volumetric objects is a difficult visualization task, especially if different rendering styles need to be applied to the components, in order to achieve the desired illustration effect. Real-time performance for even complex scenarios is obtained by exploiting the speed and flexibility of modern GPUs, but at the same time programming the necessary shaders turned into a task for GPU experts only. We foresee the demand for an intermediate level, of programming abstraction where visualization specialists can realize advanced applications without the need to deal, with shader programming intricacies. In this paper, we describe a generic technique for multi-volume rendering, which generates shader code dynamically from an abstract render graph. By combining pre-defined nodes, complex volume operations can be realized. Our system efficiently creates GPU-based fragment shader and vertex shader programs "on-the-fly" to achieve the desired visual results. We demonstrate the flexibility of our technique by applying several dynamically generated volume rendering styles to multi-modal, medical datasets. ©2008 IEEE.

关键词： Graphics processing unit

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Design Patterns for Rapid visualization Prototyping

Design Patterns for Rapid Visualization Prototyping

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International Conference on Information Visualisation (IV)

作者： Mark Giereth Thomas Ertl Visualization and Interactive Systems Institute University of Stuttgart Germany

In this paper we present three software design patterns for rapid prototyping of information visualization applications. The first pattern describes a mapping of object oriented models to relational data tables used in many visualization frameworks. The second pattern describes a script based approach for the configuration of visualization applications. The third pattern addresses the problem of performing online changes on the visual mapping by enhancing fine-grained mapping operators with scripting capabilities. We present an implementation of the patterns, which is based on the Prefuse toolkit. Finally we discuss some experimental results according to performance issues.

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visualization Enhanced Semantic Wikis for Patent Information

Visualization Enhanced Semantic Wikis for Patent Information

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International Conference on Information Visualisation (IV)

作者： Mark Giereth Thomas Ertl Visualization and Interactive Systems Institute University of Stuttgart Germany

In this paper we present a new approach for using semantic wikis for collaborative patent search and annotation. We describe an extension that allows integrating interactive visualizations into semantic wikis for getting deeper insights into the classificatory, geographical, and temporal distribution of large patent sets. This approach differs from typical wiki usage scenarios in the sense that it combines automatic content generation based on patent search activities of the users with user driven semantic annotation of patent information, e.g. patent rating, linking with prior art, reviews, translations, discussions, etc. The content generation involves a semantic model that is described in terms of different ontologies for patent information. A modern wiki system is used for semantic annotation, comments, discussions, versioning, notification, and full-text search. Our approach is motivated by using available functionalities of a modern wiki system in combination with visualization techniques to directly implement major user requirements for supporting the knowledge-intensive tasks of patent search and understanding.

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Dynamic Shader Generation for Flexible Multi-Volume visualization

Dynamic Shader Generation for Flexible Multi-Volume Visualiz...

引用

Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Friedemann RoBler Ralf P. Botchen Thomas Ertl Institute for Visualization and Interactive Systems Universität Stuttgart Germany

Volume rendering of multiple intersecting volumetric objects is a difficult visualization task, especially if different rendering styles need to be applied to the components, in order to achieve the desired illustration effect. Real-time performance for even complex scenarios is obtained by exploiting the speed and flexibility of modern GPUs, but at the same time programming the necessary shaders turned into a task for GPU experts only. We foresee the demand for an intermediate level of programming abstraction where visualization specialists can realize advanced applications without the need to deal with shader programming intricacies. In this paper, we describe a generic technique for multi-volume rendering, which generates shader code dynamically from an abstract render graph. By combining pre-defined nodes, complex volume operations can be realized. Our system efficiently creates GPU-based fragment shader and vertex shader programs "on-the-fly" to achieve the desired visual results. We demonstrate the flexibility of our technique by applying several dynamically generated volume rendering styles to multi-modal medical datasets.

关键词： Rendering (computer graphics) Computer graphics Magnetic resonance imaging Data visualization Power generation Assembly Programming profession Layout interactive systems Computed tomography

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Privacy-preserving self-localization techniques in next generation manufacturing An interdisciplinary view on the vision and implementation of smart factories

Privacy-preserving self-localization techniques in next gene...

引用

International Conference on Control, Automation, Robotics and Vision (ICARCV)

作者： D. Lucke E. Westkamper M. Eissele T. Ertl O. Siemoneit Institute of Industrial Engineering and Management (IFF) Universitaet Stuttgart Germany Visualization and Interactive Systems Group (VIS) Universitaet Stuttgart Germany Institute of Philosophy (IP) Universitaet Stuttgart Germany

Future manufacturing processes have to be highly adaptive and transformable in order to support short product life cycles and highly customized products. For an implementation of such a flexible, so-called smart factory, which is driven by a massive proliferation and usage of tiny embedded, context-aware information and communication technologies, many challenges - technical and social ones - have to be addressed. We identify major problems and focus on the location of objects and persons within manufacturing environments as an enabling key technology. Existing methods and possible solutions are evaluated and discussed. Thereby, we focus on the crucial aspect of privacy for workers when location systems are utilized. We also present a semi-automatic positioning approach that solves the discrepancy of guaranteeing the privacy of persons and highly accurate location tracking.

关键词： Production facilities Radiofrequency identification Manufacturing processes Electric breakdown Intelligent sensors Manufacturing automation Robotics and automation Context Privacy Information management

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A hardware-aware debugger for the OpenGL Shading Language

A hardware-aware debugger for the OpenGL Shading Language

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作者： Strengert, Magnus Klein, Thomas Ertl, Thomas Institute for Visualization and Interactive Systems Universität Stuttgart Germany

ISBN: (纸本)9781595936257

The enormous exibility of the modern GPU rendering pipeline as well as the availability of high-level shader languages have led to an increased demand for sophisticated programming tools. As the application domain for GPU-based algorithms extends beyond traditional computer graphics, shader programs become more and more complex. The turn-around time for debugging, profling, and optimizing GPU-based algorithms is now a critical factor in application development which is not addressed adequately by the tools available. In this paper we present a generic, minimal intrusive, and application-transparent solution for debugging OpenGL Shading Language programs, which for the first time fully supports GLSL 1.2 vertex and fragment shaders plus the recent geometry shader extension. By transparently instrumenting the shader program we retrieve information directly from the hardware pipeline and provide data for visual debugging and program analysis. Copyright © 2007 by the Association for Computing Machinery, Inc.

关键词： Pipelines

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Zoomable user interfaces in scalable vector graphics

Zoomable user interfaces in scalable vector graphics

引用

5th Annual Conference on Scalable Vector Graphics, SVG Open 2007

作者： Rotard, Martin Eissele, Mike Van Putten, Raul Ertl, Thomas Researcher in Computer Graphics and Human Computer Interaction University of Stuttgart Visualization and Interactive Systems Institute Universitaetsstr. 30 Stuttgart 70569 Germany

Zoomable user interfaces are an evolutionary outgrowth of graphical user interfaces. In this paper we propose a zoomable user interface based on Scalable Vector Graphics. Three-level zooming is proposed as a new paradigm to combine different zooming functionalities in a common interface and support zooming within the window manager. This helps to unify zooming techniques of different applications. To meet the demand of efficient and easy navigation on a user interface, several novel interaction techniques are shown that further support the integration of three-level zooming within the underlying presentation system. For mobile small-screen devices, where the benefit of zooming user interfaces is even higher, the proposed system can be operated with simple pen tap or tap and drag operations. We also present a prototypical implementation, which demonstrates how applications based on the SPARK toolkit can transparently benefit form the proposed technology.

关键词： Graphical user interfaces

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Web Based Visual Exploration of Patent Information

Web Based Visual Exploration of Patent Information

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International Conference on Information Visualisation (IV)

作者： Mark Giereth Steffen Koch Martin Rotard Thomas Ertl Visualization and Interactive Systems Institute Universität Stuttgart Stuttgart Germany

Patents are an invaluable source of scientific and technological information. Due to the strongly increasing number of patent applications and the broadening of the objectives of patent analysis, there is a great demand for ubiquitous access to patent information and for flexible visualizations meeting the requirements of different groups of users. In this paper we propose new visualization techniques for patent information and approaches for interactively exploring this information in web based environments. We show how these visualizations can be integrated into existing web portals by using a new paradigm that we call Semantic Lens.

关键词： Data visualization Portals Lenses Information analysis Chemical analysis Web pages interactive systems Instruments Protection Intellectual property

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