@inproceedings{KnothKiy2014, author = {Knoth, Alexander Henning and Kiy, Alexander}, title = {(Self-)confident through the introductory study phase with the Reflect App}, series = {CEUR Workshop Proceedings}, booktitle = {CEUR Workshop Proceedings}, number = {1227}, publisher = {CEUR-WS}, address = {Freiburg}, issn = {1613-0073}, pages = {172 -- 179}, year = {2014}, language = {en} } @article{LuckeRensing2014, author = {Lucke, Ulrike and Rensing, Christoph}, title = {A survey on pervasive education}, series = {Pervasive and mobile computing}, volume = {14}, journal = {Pervasive and mobile computing}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1574-1192}, doi = {10.1016/j.pmcj.2013.12.001}, pages = {3 -- 16}, year = {2014}, abstract = {Researchers and developers worldwide have put their efforts into the design, development and use of information and communication technology to support teaching and learning. This research is driven by pedagogical as well as technological disciplines. The most challenging ideas are currently found in the application of mobile, ubiquitous, pervasive, contextualized and seamless technologies for education, which we shall refer to as pervasive education. This article provides a comprehensive overview of the existing work in this field and categorizes it with respect to educational settings. Using this approach, best practice solutions for certain educational settings and open questions for pervasive education are highlighted in order to inspire interested developers and educators. The work is assigned to different fields, identified by the main pervasive technologies used and the educational settings. Based on these assignments we identify areas within pervasive education that are currently disregarded or deemed challenging so that further research and development in these fields are stimulated in a trans-disciplinary approach. (C) 2013 Elsevier B.V. All rights reserved.}, language = {en} } @article{Respondek2014, author = {Respondek, Tobias}, title = {A workflow for computing potential areas for wind turbines}, series = {Process design for natural scientists: an agile model-driven approach}, journal = {Process design for natural scientists: an agile model-driven approach}, number = {500}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-662-45005-5}, pages = {200 -- 215}, year = {2014}, abstract = {This paper describes the implementation of a workflow model for service-oriented computing of potential areas for wind turbines in jABC. By implementing a re-executable model the manual effort of a multi-criteria site analysis can be reduced. The aim is to determine the shift of typical geoprocessing tools of geographic information systems (GIS) from the desktop to the web. The analysis is based on a vector data set and mainly uses web services of the "Center for Spatial Information Science and Systems" (CSISS). This paper discusses effort, benefits and problems associated with the use of the web services.}, language = {en} } @incollection{KiyLuckeZoerner2014, author = {Kiy, Alexander and Lucke, Ulrike and Zoerner, Dietmar}, title = {An adaptive personal learning environment architecture}, series = {Architecture of Computing Systems - ARCS 2014 Lecture Notes in Computer Science}, volume = {2014}, booktitle = {Architecture of Computing Systems - ARCS 2014 Lecture Notes in Computer Science}, number = {8350}, publisher = {Springer}, isbn = {978-3-319-04890-1}, publisher = {Universit{\"a}t Potsdam}, pages = {60 -- 71}, year = {2014}, abstract = {Institutions are facing the challenge to integrate legacy systems with steadily growing new ones, using different technologies and interaction patterns. With the demand of offering the best potential of all systems, several not matching systems including their functions have to be aggregated and offered in a useable way. This paper presents an adaptive, generalizable and self-organized Personal Learning Environment (PLE) framework with the potential to integrate several heterogeneous services using a service-oriented architecture. First, a general overview over the field is given, followed by the description of the core components of the PLE framework. A prototypical implementation is presented. Finally, it's shown how the PLE framework can be dynamically adapted to a changing system environment, reflecting experiences from first user studies.}, language = {en} } @article{BaierMendlingWeske2014, author = {Baier, Thomas and Mendling, Jan and Weske, Mathias}, title = {Bridging abstraction layers in process mining}, series = {Information systems}, volume = {46}, journal = {Information systems}, publisher = {Elsevier}, address = {Oxford}, issn = {0306-4379}, doi = {10.1016/j.is.2014.04.004}, pages = {123 -- 139}, year = {2014}, abstract = {While the maturity of process mining algorithms increases and more process mining tools enter the market, process mining projects still face the problem of different levels of abstraction when comparing events with modeled business activities. Current approaches for event log abstraction try to abstract from the events in an automated way that does not capture the required domain knowledge to fit business activities. This can lead to misinterpretation of discovered process models. We developed an approach that aims to abstract an event log to the same abstraction level that is needed by the business. We use domain knowledge extracted from existing process documentation to semi-automatically match events and activities. Our abstraction approach is able to deal with n:m relations between events and activities and also supports concurrency. We evaluated our approach in two case studies with a German IT outsourcing company. (C) 2014 Elsevier Ltd. All rights reserved.}, language = {en} } @article{GieseHildebrandtLambers2014, author = {Giese, Holger and Hildebrandt, Stephan and Lambers, Leen}, title = {Bridging the gap between formal semantics and implementation of triple graph grammars}, series = {Software and systems modeling}, volume = {13}, journal = {Software and systems modeling}, number = {1}, publisher = {Springer}, address = {Heidelberg}, issn = {1619-1366}, doi = {10.1007/s10270-012-0247-y}, pages = {273 -- 299}, year = {2014}, abstract = {The correctness of model transformations is a crucial element for model-driven engineering of high-quality software. A prerequisite to verify model transformations at the level of the model transformation specification is that an unambiguous formal semantics exists and that the implementation of the model transformation language adheres to this semantics. However, for existing relational model transformation approaches, it is usually not really clear under which constraints particular implementations really conform to the formal semantics. In this paper, we will bridge this gap for the formal semantics of triple graph grammars (TGG) and an existing efficient implementation. While the formal semantics assumes backtracking and ignores non-determinism, practical implementations do not support backtracking, require rule sets that ensure determinism, and include further optimizations. Therefore, we capture how the considered TGG implementation realizes the transformation by means of operational rules, define required criteria, and show conformance to the formal semantics if these criteria are fulfilled. We further outline how static and runtime checks can be employed to guarantee these criteria.}, language = {en} } @article{HoosLindauerSchaub2014, author = {Hoos, Holger and Lindauer, Marius and Schaub, Torsten H.}, title = {claspfolio 2}, series = {Theory and practice of logic programming}, volume = {14}, journal = {Theory and practice of logic programming}, publisher = {Cambridge Univ. Press}, address = {New York}, issn = {1471-0684}, doi = {10.1017/S1471068414000210}, pages = {569 -- 585}, year = {2014}, abstract = {Building on the award-winning, portfolio-based ASP solver claspfolio, we present claspfolio 2, a modular and open solver architecture that integrates several different portfolio-based algorithm selection approaches and techniques. The claspfolio 2 solver framework supports various feature generators, solver selection approaches, solver portfolios, as well as solver-schedule-based pre-solving techniques. The default configuration of claspfolio 2 relies on a light-weight version of the ASP solver clasp to generate static and dynamic instance features. The flexible open design of claspfolio 2 is a distinguishing factor even beyond ASP. As such, it provides a unique framework for comparing and combining existing portfolio-based algorithm selection approaches and techniques in a single, unified framework. Taking advantage of this, we conducted an extensive experimental study to assess the impact of different feature sets, selection approaches and base solver portfolios. In addition to gaining substantial insights into the utility of the various approaches and techniques, we identified a default configuration of claspfolio 2 that achieves substantial performance gains not only over clasp's default configuration and the earlier version of claspfolio, but also over manually tuned configurations of clasp.}, language = {en} } @phdthesis{Schnjakin2014, author = {Schnjakin, Maxim}, title = {Cloud-RAID}, pages = {137}, year = {2014}, language = {de} } @article{Lis2014, author = {Lis, Monika}, title = {Constructing a Phylogenetic Tree}, series = {Process Design for Natural Scientists: an agile model-driven approach}, journal = {Process Design for Natural Scientists: an agile model-driven approach}, number = {500}, editor = {Lambrecht, Anna-Lena and Margaria, Tiziana}, publisher = {Springer Verlag}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {101 -- 109}, year = {2014}, abstract = {In this project I constructed a workflow that takes a DNA sequence as input and provides a phylogenetic tree, consisting of the input sequence and other sequences which were found during a database search. In this phylogenetic tree the sequences are arranged depending on similarities. In bioinformatics, constructing phylogenetic trees is often used to explore the evolutionary relationships of genes or organisms and to understand the mechanisms of evolution itself.}, language = {en} } @article{Noack2014, author = {Noack, Franziska}, title = {CREADED: Colored-Relief application for digital elevation data}, series = {Process design for natural scientists: an agile model-driven approach}, journal = {Process design for natural scientists: an agile model-driven approach}, number = {500}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {186 -- 199}, year = {2014}, abstract = {In the geoinformatics field, remote sensing data is often used for analyzing the characteristics of the current investigation area. This includes DEMs, which are simple raster grids containing grey scales representing the respective elevation values. The project CREADED that is presented in this paper aims at making these monochrome raster images more significant and more intuitively interpretable. For this purpose, an executable interactive model for creating a colored and relief-shaded Digital Elevation Model (DEM) has been designed using the jABC framework. The process is based on standard jABC-SIBs and SIBs that provide specific GIS functions, which are available as Web services, command line tools and scripts.}, language = {en} } @article{Blaese2014, author = {Blaese, Leif}, title = {Data mining for unidentified protein squences}, series = {Process design for natural scientists: an agile model-driven approach}, journal = {Process design for natural scientists: an agile model-driven approach}, number = {500}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {73 -- 87}, year = {2014}, abstract = {Through the use of next generation sequencing (NGS) technology, a lot of newly sequenced organisms are now available. Annotating those genes is one of the most challenging tasks in sequence biology. Here, we present an automated workflow to find homologue proteins, annotate sequences according to function and create a three-dimensional model.}, language = {en} } @inproceedings{KiyGruenwaldZoerneretal.2014, author = {Kiy, Alexander and Gr{\"u}nwald, Franka and Zoerner, Dietmar and Lucke, Ulrike}, title = {Ein Hochschul-App-Framework: Hybrid und modular}, series = {DeLFI 2014 - Die 12. e-Learning Fachtagung Informatik Lecture Notes in Informatics}, booktitle = {DeLFI 2014 - Die 12. e-Learning Fachtagung Informatik Lecture Notes in Informatics}, number = {P-233}, editor = {Trasch, Stephan and Pl{\"o}tzner, Rolf and Schneider, Gerhard and Sassiat, Daniel and Gayer, Claudia and W{\"o}hrle, Nicole}, publisher = {Gesellschaft f{\"u}r Informatik e.V.}, address = {Bonn}, isbn = {978-3-88579-627-5}, pages = {205 -- 216}, year = {2014}, abstract = {Mobile Endger{\"a}te und die dazugeh{\"o}rigen Applikationen sind zu einem unverzichtbaren Bestandteil des t{\"a}glichen Lebens geworden und erm{\"o}glichen den ortsund zeitunabh{\"a}ngigen Zugriff auf wichtige Informationen. Hochschulspezifische An- gebote sind im mobilen Bereich hingegen noch immer nicht fl{\"a}chendeckend anzutreffen und lassen sich i. d. R. nur auf Einzelaktivit{\"a}ten Studierender und Lehrender zur{\"u}ckf{\"u}hren. Dabei k{\"o}nnen mobile Applikationen einen essentiellen Beitrag zur Verbesserung der studentischen Selbstorganisation sowie f{\"u}r die Ausgestaltung und Erg{\"a}nzung von konkreten Lehr-/Lernszenarien leisten. Dieser Artikel stellt ein modulares Hochschul-App-Framework vor, das sowohl zentrale campusbezogene Dienste als auch dezentrale Lernapplikationen unter einer Oberfl{\"a}che vereint anbietet. Anhand einer Analyse von St{\"a}rken und Schw{\"a}chen werden verschiedene Ans{\"a}tze in Hinblick auf Anforderungen, Entwicklung, Wartung und Betrieb der Hochschul-App zusammengefasst und bewertet. Es wird auf die zugrundeliegende serviceorientierte Architektur eingegangen, die eine Portierung der Applikation auf andere Hochschulen mit einem vertretbaren Aufwand erm{\"o}glicht. Der Beitrag schließt mit einer Darstellung der ersten Ergebnisse und weiterf{\"u}hrender {\"U}berlegungen und Arbeiten.}, language = {de} } @phdthesis{Krueger2014, author = {Kr{\"u}ger, Jens}, title = {Enterprise-specific in-memory data managment : HYRISEc - an in-memory column store engine for OLXP}, publisher = {Hasso-Plattner-Insitut}, address = {Potsdam}, pages = {201 S.}, year = {2014}, language = {en} } @phdthesis{Lincke2014, author = {Lincke, Jens}, title = {Evolving Tools in a Collaborative Self-supporting Development Environment}, school = {Universit{\"a}t Potsdam}, pages = {164}, year = {2014}, language = {en} } @article{Vierheller2014, author = {Vierheller, Janine}, title = {Exploratory Data Analysis}, series = {Process Design for Natural Scientists: an agile model-driven approach}, journal = {Process Design for Natural Scientists: an agile model-driven approach}, number = {500}, editor = {Lambrecht, Anna-Lena and Margaria, Tiziana}, publisher = {Axel Springer Verlag}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {110 -- 126}, year = {2014}, abstract = {In bioinformatics the term exploratory data analysis refers to different methods to get an overview of large biological data sets. Hence, it helps to create a framework for further analysis and hypothesis testing. The workflow facilitates this first important step of the data analysis created by high-throughput technologies. The results are different plots showing the structure of the measurements. The goal of the workflow is the automatization of the exploratory data analysis, but also the flexibility should be guaranteed. The basic tool is the free software R.}, language = {en} } @article{ZenderMetzlerLucke2014, author = {Zender, Raphael and Metzler, Richard and Lucke, Ulrike}, title = {FreshUP-A pervasive educational game for freshmen}, series = {Pervasive and mobile computing}, volume = {14}, journal = {Pervasive and mobile computing}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1574-1192}, doi = {10.1016/j.pmcj.2013.09.003}, pages = {47 -- 56}, year = {2014}, abstract = {Students beginning their studies at university face manifold problems such as orientation in a new environment and organizing their courses. This article presents the implementation and successful empirical evaluation of the pervasive browser-based educational game "FreshUP", which aims at helping to overcome the initial difficulties of freshmen. In contrast to a conventional scavenger hunt, mobile pervasive games like FreshUP, bridging in-game and real world activities, have the potential to provide help in a motivating manner using new technology which is currently becoming more and more common. (C) 2013 Elsevier B.V. All rights reserved.}, language = {en} } @article{GaroufiKoller2014, author = {Garoufi, Konstantina and Koller, Alexander}, title = {Generation of effective referring expressions in situated context}, series = {Language, cognition and neuroscience}, volume = {29}, journal = {Language, cognition and neuroscience}, number = {8}, publisher = {Routledge, Taylor \& Francis Group}, address = {Abingdon}, issn = {2327-3798}, doi = {10.1080/01690965.2013.847190}, pages = {986 -- 1001}, year = {2014}, abstract = {In task-oriented communication, references often need to be effective in their distinctive function, that is, help the hearer identify the referent correctly and as effortlessly as possible. However, it can be challenging for computational or empirical studies to capture referential effectiveness. Empirical findings indicate that human-produced references are not always optimally effective, and that their effectiveness may depend on different aspects of the situational context that can evolve dynamically over the course of an interaction. On this basis, we propose a computational model of effective reference generation which distinguishes speaker behaviour according to its helpfulness to the hearer in a certain situation, and explicitly aims at modelling highly helpful speaker behaviour rather than speaker behaviour invariably. Our model, which extends the planning-based paradigm of sentence generation with a statistical account of effectiveness, can adapt to the situational context by making this distinction newly for each new reference. We find that the generated references resemble those of effective human speakers more closely than references of baseline models, and that they are resolved correctly more often than those of other models participating in a shared-task evaluation with human hearers. Finally, we argue that the model could serve as a methodological framework for computational and empirical research on referential effectiveness.}, language = {en} } @article{Teske2014, author = {Teske, Daniel}, title = {Geocoder accuracy ranking}, series = {Process design for natural scientists: an agile model-driven approach}, journal = {Process design for natural scientists: an agile model-driven approach}, number = {500}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {161 -- 174}, year = {2014}, abstract = {Finding an address on a map is sometimes tricky: the chosen map application may be unfamiliar with the enclosed region. There are several geocoders on the market, they have different databases and algorithms to compute the query. Consequently, the geocoding results differ in their quality. Fortunately the geocoders provide a rich set of metadata. The workflow described in this paper compares this metadata with the aim to find out which geocoder is offering the best-fitting coordinate for a given address.}, language = {en} } @article{Holler2014, author = {Holler, Robin}, title = {GraffDok - a graffiti documentation application}, series = {Process design for natural scientists: an agile model-driven approach}, journal = {Process design for natural scientists: an agile model-driven approach}, number = {500}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {239 -- 251}, year = {2014}, abstract = {GraffDok is an application helping to maintain an overview over sprayed images somewhere in a city. At the time of writing it aims at vandalism rather than at beautiful photographic graffiti in an underpass. Looking at hundreds of tags and scribbles on monuments, house walls, etc. it would be interesting to not only record them in writing but even make them accessible electronically, including images. GraffDok's workflow is simple and only requires an EXIF-GPS-tagged photograph of a graffito. It automatically determines its location by using reverse geocoding with the given GPS-coordinates and the Gisgraphy WebService. While asking the user for some more meta data, GraffDok analyses the image in parallel with this and tries to detect fore- and background - before extracting the drawing lines and make them stand alone. The command line based tool ImageMagick is used here as well as for accessing EXIF data. Any meta data is written to csv-files, which will stay easily accessible and can be integrated in TeX-files as well. The latter ones are converted to PDF at the end of the workflow, containing a table about all graffiti and a summary for each - including the generated characteristic graffiti pattern image.}, language = {en} } @article{Schuett2014, author = {Sch{\"u}tt, Christine}, title = {Identification of differentially expressed genes}, series = {Process design for natural scientists: an agile model-driven approach}, journal = {Process design for natural scientists: an agile model-driven approach}, number = {500}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {127 -- 139}, year = {2014}, abstract = {With the jABC it is possible to realize workflows for numerous questions in different fields. The goal of this project was to create a workflow for the identification of differentially expressed genes. This is of special interest in biology, for it gives the opportunity to get a better insight in cellular changes due to exogenous stress, diseases and so on. With the knowledge that can be derived from the differentially expressed genes in diseased tissues, it becomes possible to find new targets for treatment.}, language = {en} }