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A cloud repository and discovery framework based on a unified business and cloud service ontology

A cloud repository and discovery framework based on a unifie...

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2012 IEEE 8th World Congress on Services, SERVICES 2012

作者： Tahamtan, Amirreza Beheshti, Seyed Amir Anjomshoaa, Amin Tjoa, A. Min Institute of Software Technology and Interactive Systems Information and Software Engineering Group Vienna University of Technology Vienna Austria

ISBN: (纸本)9780769547565

Cloud computing introduces a fundamental shift in service delivery. A market registry, flexibility, exchangeability and integration of services are important issues for its success. In this work we introduce a unified Cloud and business service ontology with querying capabilities. Our framework addresses two aspects: on the one hand it gives answer to leading question how we can structure the term Cloud computing (as a question of basic research) and how we can enable a matching between offered Cloud services and demand. It closes the gap how we can summarize and describe Cloud services in a standardized way. On the other hand, it particularly addresses the demand for flexibility and exchangeability by the Cloud Computing paradigm and can serves as a repository of services. © 2012 IEEE.

关键词： Ontology

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Specification, Execution, and detection of refactorings for software models

Specification, Execution, and detection of refactorings for ...

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Work-in-Progress Session, P3JW 2010 - At the 8th International Conference on the Principles and Practice of Programming in Java, PPPJ 2010

作者： Langer, Philip Wieland, Konrad Brosch, Petra Business Informatics Group Institute for Software Systems and Interactive Systems Vienna University of Technology Austria

Predefined automatically applicable composite operations such as refactorings are a prerequisite for efficient software modeling. Some modeling environments provide an initial set of basic refactorings, but they hardly offer extension points for user-specified refactorings. Even if extension points exist, the introduction of new refactorings requires programming skills and deep knowledge of the respective metamodel of the used modeling language. We present EMF Modeling Operations, a Java™ based framework for specifying and executing composite operations within the user's modeling language and editor of choice. The user demonstrates a composite operation on a concrete example from which a generic and executable operation specification is semi-automatically derived. Furthermore, we show how the resulting specification may be used to enable an a-posteriori detection of applications of the specified operations between two successive versions of a model, also in absence of a directly recorded change log.

关键词： Modeling languages

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Chronic pain rehabilitation with a serious game using multimodal input

Chronic pain rehabilitation with a serious game using multim...

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International Conference on Virtual Rehabilitation

作者： Schonauer, Christian Pintaric, Thomas Kaufmann, Hannes Jansen-Kosterink, Stephanie Vollenbroek-Hutten, Miriam Interactive Media Systems Group Institute of Software Technology and Interactive Systems Vienna University of Technology Austria Roessingh Research and Development Enschede Netherlands

ISBN: (纸本)9781612844749

Rehabilitation for chronic pain follows a multidisciplinary approach, which despite the effort, often lacks the long term success and patients often fail to translate the skills learned in therapy to every day life. Serious games are hypothesized to support patients to self manage their complaints and keep training their physical functions by themselves, especially, when the game is controlled by the patient's own body performance. In this paper we present the implementation of a system providing multimodal input, including our own full body motion capture system, a low cost motion capture system (Microsoft Kinect) and biosignal acquisition devices to a game engine. In addition, a workflow has been established, that enables the use of the acquired multimodal data for serious games in a medical environment. Finally, a serious game has been implemented, targeting rehabilitation of patients with chronic pain of the lower back and neck. The focus of this work is on the multimodal input and how it is used in a game to support rehabilitation of chronic pain patients. A brief comparison of a marker-based full body MoCap system and Microsoft's Kinect is included. Preliminary results of tests currently underway are provided. © 2011 IEEE.

关键词： Patient rehabilitation

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Adaptive methods of Kalman filtering for personal positioning systems

Adaptive methods of Kalman filtering for personal positionin...

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作者： Herrera, E. Pulido Kaufmann, H. Institute for Software Technology and Interactive Systems Vienna University of Technology Austria

ISBN: (纸本)9781617827358

Kalman filtering is very efficient for data fusion, in which the definition of the process and measurement noises (i.e. the matrices Q and R, respectively) greatly influences the filter performance. In recent years several studies reported that adjustments of Q and R can be helpful to reduce the errors of the estimations. In this paper, various methods for making adjustments to the matrices Q and R are introduced for the particular case of Personal Positioning systems (PPS). The aim is to observe the improvements achieved in an extended Kalman filter when adaptive methods are applied, in other words to observe their influence on the user's path obtained. These adjustments are considered to be needed because environmental conditions in such systems are often not fixed. The methods to be analyzed are: (1) the weighted Kalman filter;(2) scaling matrix Q (3) adjustments of Q and R based on sequence-innovation;and (4) a combination of the method (2) and (3), i.e. Q is estimated by applying a scale factor and adjustments to R are realized in accordance with the method (3). Given that the filter may diverge, we use the χ2 test to evaluate validity of the estimations, which is based on the analysis of the innovations. Individual components of the innovation vector are evaluated in order to correct or eliminate wrong information for data fusion. The PPS is based on the Dead Reckoning (DR) algorithm. The errors of the DR parameters are estimated with an Extended Kalman Filter (EKF), which combines the measurements of a GPS and an inertial measurement unit (IMU). The results show that each method allows us to obtain consistent Kalman filtering and they help to obtain better user's trajectories, but additional techniques and/or technologies should be used.

关键词： Extended Kalman filters

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Comparative evaluation of an interactive time-series visualization that combines quantitative data with qualitative abstractions

Comparative evaluation of an interactive time-series visuali...

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14th Eurographics Conference on Visualization 2012, EuroVis 2012

作者： Aigner, W. Rind, A. Hoffmann, S. Institute of Software Technology and Interactive Systems Vienna University of Technology Austria

In many application areas, analysts have to make sense of large volumes of multivariate time-series data. Explorative analysis of this kind of data is often difficult and overwhelming at the level of raw data. Temporal data abstraction reduces data complexity by deriving qualitative statements that reflect domain-specific key characteristics. Visual representations of abstractions and raw data together with appropriate interaction methods can support analysts in making their data easier to understand. Such a visualization technique that applies smooth semantic zooming has been developed in the context of patient data analysis. However, no empirical evidence on its effectiveness and efficiency is available. In this paper, we aim to fill this gap by reporting on a controlled experiment that compares this technique with another visualization method used in the well-known KNAVE-II framework. Both methods integrate quantitative data with qualitative abstractions whereas the first one uses a composite representation with color-coding to display the qualitative data and spatial position coding for the quantitative data. The second technique uses juxtaposed representations for quantitative and qualitative data with spatial position coding for both. Results show that the test persons using the composite representation were generally faster, particularly for more complex tasks that involve quantitative values as well as qualitative abstractions. © 2012 The Author(s).

关键词： Data visualization

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EvalBench: A software library for visualization evaluation

EvalBench: A software library for visualization evaluation

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15th Eurographics Conference on Visualization, EuroVis 2013

作者： Aigner, W. Hoffmann, S. Rind, A. Institute of Software Technology and Interactive Systems Vienna University of Technology Austria

It is generally acknowledged in visualization research that it is necessary to evaluate visualization artifacts in order to provide empirical evidence on their effectiveness and efficiency as well as their usability and utility. However, the difficulties of conducting such evaluations still remain an issue. Apart from the required know-how to appropriately design and conduct user studies, the necessary implementation effort for evaluation features in visualization software is a considerable obstacle. To mitigate this, we present EvalBench, an easy-to-use, flexible, and reusable software library for visualization evaluation written in Java. We é its design choices and basic abstractions of our conceptual architecture and demonstrate its applicability by a number of case studies. EvalBench reduces implementation effort for evaluation features and makes conducting user studies easier. It can be used and integrated with third-party visualization prototypes that need to be evaluated via loose coupling. Eval- Bench supports both, quantitative and qualitative evaluation methods such as controlled experiments, interaction logging, laboratory questionnaires, heuristic evaluations, and insight diaries. © 2013 The Author(s).

关键词： Visualization

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Privacy-preserving storage and access of medical data through pseudonymization and encryption

Privacy-preserving storage and access of medical data throug...

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Lecture Notes in Computer Science

作者： Heurix, Johannes Neubauer, Thomas SBA Research Austria Vienna University of Technology Institute of Software Technology and Interactive Systems Austria

ISBN: (纸本)9783642228896

E-health allows better communication between health care providers and higher availability of medical data. However, the downside of interconnected systems is the increased probability of unauthorized access to highly sensitive records that could result in serious discrimination against the patient. This article provides an overview of actual privacy threats and presents a pseudonymization approach that preserves the patient's privacy and data confidentiality. It allows (direct care) primary use of medical records by authorized health care providers and privacy-preserving (non-direct care) secondary use by researchers. The solution also addresses the identifying nature of genetic data by extending the basic pseudonymization approach with queryable encryption. © 2011 Springer-Verlag.

关键词： Digital storage

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Making pre-trip services context-aware

Making pre-trip services context-aware

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10th International Conference on Electronic Commerce, ICEC 2008

作者： Grün, Christoph Institute of Software Technology and Interactive Systems Electronic Commerce Group Vienna University of Technology Austria

The process of selection, configuration and consumption of tourist information services is a complex task for the user. This is not least since existing tools most often focus on supporting either the pre- or post-trip phase or the on-trip phase itself by providing context-aware services. The goal of this thesis is to establish a framework that makes pre-trip services context-aware, thus reducing the gap between the pre-trip and on-trip phase by providing a single point of access. This is done by facilitating service selection and configuration in the pre-trip phase and context-aware service consumption in the on-trip phase. Its applicability and feasibility will be proved by a working prototype and evaluated through field studies.

关键词： Information services

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A runtime model for fUML

A runtime model for fUML

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7th Workshop on Models@run.time, MRT 2012 - Being Part of the ACM/IEEE 15th International Conference on Model Driven Engineering Languages and systems, MODELS 2012

作者： Mayerhofer, Tanja Langer, Philip Kappel, Gerti Business Informatics Group Institute of Software Technology and Interactive Systems Vienna University of Technology Austria

ISBN: (纸本)9781450317993

With the introduction of fUML, an OMG standard defining the operational semantics of a subset of UML and the conforming virtual machine, UML models can be used not only for informal design sketching but also for completely building executable systems. Although this has been an important step for UML, the full potential of having executable UML models, such as enabling runtime analysis and adaptation, cannot be realized using the standardized virtual machine due to the lack of the adequate means for accessing important runtime information and controlling the execution of UML models. In this paper, we aim at establishing the necessary basis to overcome this limitation. Therefore, we introduce extensions of the standardized fUML virtual machine in terms of a dedicated trace model, an event model, and a command API. We provide an open-source implementation of the proposed extensions, as well as a model debugger for UML models based on this implementation to demonstrate the feasibility of the presented concepts. © 2012 ACM.

关键词： Virtual machine

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IT governance, risk & compliance (GRC) status quo and integration: An explorative industry case study

IT governance, risk & compliance (GRC) status quo and integr...

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2011 IEEE World Congress on Services, SERVICES 2011

作者： Racz, Nicolas Weippl, Edgar Bonazzi, Riccardo Institute of Software Technology and Interactive Systems TU Vienna Austria Information Systems Institute University of Lausanne Switzerland

ISBN: (纸本)9780769544618

The integration of governance, risk, and compliance (GRC) activities has gained importance over the last years. This paper presents an analysis of the GRC integration efforts in information technology departments of three large enterprises. Action design research is used to organize the research in order to assess IT GRC activities based on a model with five dimensions. By means of semi-structured interviews key findings concerning the status quo of the three IT GRC disciplines, their integration and their relation to GRC on the corporate level are identified and rated. Five key findings explain the main commonalities and differences observed. © 2011 IEEE.

关键词： Risk management

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