@inproceedings{CurzonKalasSchubertetal.2015,
  author    = {Curzon, Paul and Kalas, Ivan and Schubert, Sigrid and Schaper, Niclas and Barnes, Jan and Kennewell, Steve and Br{\"o}ker, Kathrin and Kastens, Uwe and Magenheim, Johannes and Dagiene, Valentina and Stupuriene, Gabriele and Ellis, Jason Brent and Abreu-Ellis, Carla Reis and Grillenberger, Andreas and Romeike, Ralf and Haugsbakken, Halvdan and Jones, Anthony and Lewin, Cathy and McNicol, Sarah and Nelles, Wolfgang and Neugebauer, Jonas and Ohrndorf, Laura and Schaper, Niclas and Schubert, Sigrid and Opel, Simone and Kramer, Matthias and Trommen, Michael and Pottb{\"a}cker, Florian and Ilaghef, Youssef and Passig, David and Tzuriel, David and Kedmi, Ganit Eshel and Saito, Toshinori and Webb, Mary and Weigend, Michael and Bottino, Rosa and Chioccariello, Augusto and Christensen, Rhonda and Knezek, Gerald and Gioko, Anthony Maina and Angondi, Enos Kiforo and Waga, Rosemary and Ohrndorf, Laura and Or-Bach, Rachel and Preston, Christina and Younie, Sarah and Przybylla, Mareen and Romeike, Ralf and Reynolds, Nicholas and Swainston, Andrew and Bendrups, Faye and Sysło, Maciej M. and Kwiatkowska, Anna Beata and Zieris, Holger and Gerstberger, Herbert and M{\"u}ller, Wolfgang and B{\"u}chner, Steffen and Opel, Simone and Schiller, Thomas and Wegner, Christian and Zender, Raphael and Lucke, Ulrike and Diethelm, Ira and Syrbe, J{\"o}rn and Lai, Kwok-Wing and Davis, Niki and Eickelmann, Birgit and Erstad, Ola and Fisser, Petra and Gibson, David and Khaddage, Ferial and Knezek, Gerald and Micheuz, Peter and Kloos, Carlos Delgado},
  title     = {KEYCIT 2014},
  editor    = {Brinda, Torsten and Reynolds, Nicholas and Romeike, Ralf and Schwill, Andreas},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-292-6},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-70325},
  pages     = {438},
  year      = {2015},
  abstract  = {In our rapidly changing world it is increasingly important not only to be an expert in a chosen field of study but also to be able to respond to developments, master new approaches to solving problems, and fulfil changing requirements in the modern world and in the job market. In response to these needs key competencies in understanding, developing and using new digital technologies are being brought into focus in school and university programmes. The IFIP TC3 conference "KEYCIT - Key Competences in Informatics and ICT (KEYCIT 2014)" was held at the University of Potsdam in Germany from July 1st to 4th, 2014 and addressed the combination of key competencies, Informatics and ICT in detail. The conference was organized into strands focusing on secondary education, university education and teacher education (organized by IFIP WGs 3.1 and 3.3) and provided a forum to present and to discuss research, case studies, positions, and national perspectives in this field.},
  language  = {en}
}
@book{SmirnovReijersNugterenetal.2010,
  author    = {Smirnov, Sergey and Reijers, Hajo A. and Nugteren, Thijs and Weske, Mathias},
  title     = {Business process model abstraction : theory and practice},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-054-0},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41782},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {17},
  year      = {2010},
  abstract  = {Business process management aims at capturing, understanding, and improving work in organizations. The central artifacts are process models, which serve different purposes. Detailed process models are used to analyze concrete working procedures, while high-level models show, for instance, handovers between departments. To provide different views on process models, business process model abstraction has emerged. While several approaches have been proposed, a number of abstraction use case that are both relevant for industry and scientifically challenging are yet to be addressed. In this paper we systematically develop, classify, and consolidate different use cases for business process model abstraction. The reported work is based on a study with BPM users in the health insurance sector and validated with a BPM consultancy company and a large BPM vendor. The identified fifteen abstraction use cases reflect the industry demand. The related work on business process model abstraction is evaluated against the use cases, which leads to a research agenda.},
  language  = {en}
}
@phdthesis{Doerge2015,
  author    = {D{\"o}rge, Christina},
  title     = {Informatische Schl{\"u}sselkompetenzen},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-262-9},
  issn      = {1868-0844},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-70470},
  school      = {Universit{\"a}t Potsdam},
  pages     = {458},
  year      = {2015},
  abstract  = {Seit den 60er Jahren gibt es im deutschsprachigen Raum Diskussionen um die Begriffe Schl{\"u}sselqualifikation und (Schl{\"u}ssel-)Kompetenz, welche seit ca. 2000 auch in der Informatikdidaktik angekommen sind. Die Diskussionen der Fachdisziplinen und ihre Bedeutung f{\"u}r die Informatikdidaktik sind Gegenstand des ersten Teils dieser Dissertation. Es werden Rahmenmodelle zur Strukturierung und Einordnung von Kompetenzen entworfen, die f{\"u}r alle Fachdisziplinen nutzbar sind. Im zweiten Teil wird ein methodologischer Weg gezeigt, Schl{\"u}sselkompetenzen herzuleiten, ohne normativ vorgehen zu m{\"u}ssen. Hierzu wird das Verfahren der Qualitativen Inhaltsanalyse (QI) auf informatikdidaktische Ansätze angewendet. Die resultierenden Kompetenzen werden in weiteren Schritten verfeinert und in die zuvor entworfenen Rahmenmodelle eingeordnet. Das Ergebnis sind informatische Schl{\"u}sselkompetenzen, welche ein spezifisches Bild der Informatik zeichnen und zur Analyse bereits bestehender Curricula genutzt werden können. Zusätzlich zeigt das Verfahren einen Weg auf, wie Schl{\"u}sselkompetenzen auf nicht-normativem Wege generell hergeleitet werden können.},
  language  = {de}
}
@phdthesis{Kugel2005,
  author    = {Kugel, Rudolf},
  title     = {Ein Beitrag zur Problematik der Integration virtueller Maschinen},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7195},
  school      = {Universit{\"a}t Potsdam},
  year      = {2005},
  abstract  = {Moderne Softwaresysteme sind komplexe Gebilde, welche h{\"a}ufig im Verbund mit anderen technischen und betriebswirtschaftlichen Systemen eingesetzt werden. F{\"u}r die Hersteller solcher Systeme stellt es oft eine große Herausforderung dar, den oft weit reichenden Anforderungen bez{\"u}glich der Anpassbarkeit solcher Systeme gerecht zu werden. Zur Erf{\"u}llung dieser Anforderungen hat es sich vielfach bew{\"a}hrt, eine virtuelle Maschine in das betreffende System zu integrieren. Die Dissertation richtet sich insbesondere an Personen, die vor der Aufgabe der Integration virtueller Maschinen in bestehende Systeme stehen und zielt darauf ab, solche f{\"u}r die Entscheidung {\"u}ber Integrationsfragen wichtigen Zusammenh{\"a}nge klar darzustellen. Typischerweise treten bei der Integration einer virtuellen Maschine in ein System eine Reihe unterschiedlicher Problemstellungen auf. Da diese Problemstellungen oft eng miteinander verzahnt sind, ist eine isolierte Betrachtung meist nicht sinnvoll. Daher werden die Problemstellungen anhand eines zentral gew{\"a}hlten, sehr umfangreichen Beispiels aus der industriellen Praxis eingef{\"u}hrt. Dieses Beispiel hat die Integration der "Java Virtual Machine" in den SAP R/3 Application Server zum Gegenstand. Im Anschluss an dieses Praxisbeispiel wird die Diskussion der Integrationsproblematik unter Bezug auf eine Auswahl weiterer, in der Literatur beschriebener Integrationsbeispiele vertieft. Das Hauptproblem bei der Behandlung der Integrationsproblematik bestand darin, dass die vorgefundenen Beschreibungen, der als Beispiel herangezogenen Systeme, nur bedingt als Basis f{\"u}r die Auseinandersetzung mit der Integrationsproblematik geeignet waren. Zur Schaffung einer verwertbaren Diskussionsgrundlage war es daher erforderlich, eine homogene, durchg{\"a}ngige Modellierung dieser Systeme vorzunehmen. Die Modellierung der Systeme erfolgte dabei unter Verwendung der "Fundamental Modeling Concepts (FMC)". Die erstellten Modelle sowie die auf Basis dieser Modelle durchgef{\"u}hrte Gegen{\"u}berstellung der unterschiedlichen Ans{\"a}tze zur L{\"O}sung typischer Integrationsprobleme bilden den Hauptbeitrag der Dissertation. Im Zusammenhang mit der Integration virtueller Maschinen in bestehende Systeme besteht h{\"a}ufig der Bedarf, zeitgleich mehrere "Programme" durch die integrierte virtuelle Maschine ausf{\"u}hren zu lassen. Angesichts der Konstruktionsmerkmale vieler heute verbreiteter virtueller Maschinen stellt die Realisierung eines "betriebsmittelschonenden Mehrprogrammbetriebs" eine große Herausforderung dar. Die Darstellung des Spektrums an Maßnahmen zur Realisierung eines "betriebsmittelschonenden Mehrprogrammbetriebs" bildet einen zweiten wesentlichen Beitrag der Dissertation.},
  subject      = {Virtuelle Maschine},
  language  = {de}
}
@article{LadleifWeske2021,
  author    = {Ladleif, Jan and Weske, Mathias},
  title     = {Which event happened first?},
  series = {Frontiers in blockchain},
  volume    = {4},
  journal   = {Frontiers in blockchain},
  publisher = {Frontiers in Blockchain},
  address   = {Lausanne, Schweiz},
  issn      = {2624-7852},
  doi       = {10.3389/fbloc.2021.758169},
  pages     = {1 -- 16},
  year      = {2021},
  abstract  = {First come, first served: Critical choices between alternative actions are often made based on events external to an organization, and reacting promptly to their occurrence can be a major advantage over the competition. In Business Process Management (BPM), such deferred choices can be expressed in process models, and they are an important aspect of process engines. Blockchain-based process execution approaches are no exception to this, but are severely limited by the inherent properties of the platform: The isolated environment prevents direct access to external entities and data, and the non-continual runtime based entirely on atomic transactions impedes the monitoring and detection of events. In this paper we provide an in-depth examination of the semantics of deferred choice, and transfer them to environments such as the blockchain. We introduce and compare several oracle architectures able to satisfy certain requirements, and show that they can be implemented using state-of-the-art blockchain technology.},
  language  = {en}
}
@book{WistSchaeferVogleretal.2010,
  author    = {Wist, Dominic and Schaefer, Mark and Vogler, Walter and Wollowski, Ralf},
  title     = {STG decomposition : internal communication for SI implementability},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-037-3},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-40786},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {36},
  year      = {2010},
  abstract  = {STG decomposition is a promising approach to tackle the complexity problems arising in logic synthesis of speed independent circuits, a robust asynchronous (i.e. clockless) circuit type. Unfortunately, STG decomposition can result in components that in isolation have irreducible CSC conflicts. Generalising earlier work, it is shown how to resolve such conflicts by introducing internal communication between the components via structural techniques only.},
  language  = {en}
}
@book{BauckmannLeserNaumann2010,
  author    = {Bauckmann, Jana and Leser, Ulf and Naumann, Felix},
  title     = {Efficient and exact computation of inclusion dependencies for data integration},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-048-9},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41396},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {36},
  year      = {2010},
  abstract  = {Data obtained from foreign data sources often come with only superficial structural information, such as relation names and attribute names. Other types of metadata that are important for effective integration and meaningful querying of such data sets are missing. In particular, relationships among attributes, such as foreign keys, are crucial metadata for understanding the structure of an unknown database. The discovery of such relationships is difficult, because in principle for each pair of attributes in the database each pair of data values must be compared. A precondition for a foreign key is an inclusion dependency (IND) between the key and the foreign key attributes. We present with Spider an algorithm that efficiently finds all INDs in a given relational database. It leverages the sorting facilities of DBMS but performs the actual comparisons outside of the database to save computation. Spider analyzes very large databases up to an order of magnitude faster than previous approaches. We also evaluate in detail the effectiveness of several heuristics to reduce the number of necessary comparisons. Furthermore, we generalize Spider to find composite INDs covering multiple attributes, and partial INDs, which are true INDs for all but a certain number of values. This last type is particularly relevant when integrating dirty data as is often the case in the life sciences domain - our driving motivation.},
  language  = {en}
}
@book{BauckmannAbedjanLeseretal.2012,
  author    = {Bauckmann, Jana and Abedjan, Ziawasch and Leser, Ulf and M{\"u}ller, Heiko and Naumann, Felix},
  title     = {Covering or complete? : Discovering conditional inclusion dependencies},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-212-4},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-62089},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {34},
  year      = {2012},
  abstract  = {Data dependencies, or integrity constraints, are used to improve the quality of a database schema, to optimize queries, and to ensure consistency in a database. In the last years conditional dependencies have been introduced to analyze and improve data quality. In short, a conditional dependency is a dependency with a limited scope defined by conditions over one or more attributes. Only the matching part of the instance must adhere to the dependency. In this paper we focus on conditional inclusion dependencies (CINDs). We generalize the definition of CINDs, distinguishing covering and completeness conditions. We present a new use case for such CINDs showing their value for solving complex data quality tasks. Further, we define quality measures for conditions inspired by precision and recall. We propose efficient algorithms that identify covering and completeness conditions conforming to given quality thresholds. Our algorithms choose not only the condition values but also the condition attributes automatically. Finally, we show that our approach efficiently provides meaningful and helpful results for our use case.},
  language  = {en}
}
@misc{Kunde2013,
  type      = {Master Thesis},
  author    = {Kunde, Felix},
  title     = {CityGML in PostGIS : Portierung, Anwendung und Performanz-Analyse am Beipiel der 3D City Database von Berlin},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-63656},
  school      = {Universit{\"a}t Potsdam},
  year      = {2013},
  abstract  = {Der internationale Standard CityGML ist zu einer zentralen Schnittstelle f{\"u}r die geometrische wie semantische Beschreibung von 3D-Stadtmodellen geworden. Das Institut f{\"u}r Geod{\"a}sie und Geoinformationstechnik (IGG) der Technischen Universit{\"a}t Berlin leistet mit ihren Entwicklung der 3D City Database und der Importer/Exporter Software einen entscheidenden Beitrag die Komplexit{\"a}t von CityGML-Daten in einer Geodatenbank intuitiv und effizient nutzen zu k{\"o}nnen. Die Software des IGG ist Open Source, unterst{\"u}tzte mit Oracle Spatial (ab Version 10g) aber bisher nur ein propriet{\"a}res Datenbank Management System (DBMS). Im Rahmen dieser Masterarbeit wurde eine Portierung auf die freie Datenbank-Software PostgreSQL/PostGIS vorgenommen und mit der Performanz der Oracle-Version verglichen. PostGIS gilt als eine der ausgereiftesten Geodatenbanken und wurde in diesem Jahr mit dem Release der Version 2.0 nochmals um zahlreiche Funktionen und Features (u.a. auch 3D-Unterst{\"u}tzung) erweitert. Die Ergebnisse des Vergleiches sowie die umfangreiche Gegen{\"u}berstellung aller verwendeten Konzepte (SQL, PL, Java) geben Aufschluss auf die Charakteristika beider r{\"a}umlicher DBMS und erm{\"o}glichen einen Erkenntnisgewinn {\"u}ber die Projektgrenzen hinaus.},
  language  = {de}
}
@inproceedings{HofukuChoNishidaetal.2013,
  author    = {Hofuku, Yayoi and Cho, Shinya and Nishida, Tomohiro and Kanemune, Susumu and Linck, Barbara and Kim, Seungyon and Park, Seongbin and Van{\´i}ček, Jiř{\´i} and Gujberov{\´a}, Monika and Tomcs{\´a}nyi, Peter and Dagiene, Valentina and Jevsikova, Tatjana and Schulte, Carsten and Sentance, Sue and Thota, Neena and G{\"u}lbahar, Yasemin and İlkhan, Mustafa and Kilis, Selcan and Arslan, Okan and Nakano, Yoshiaki and Izutsu, Katsunobu and Lessner, Daniel and Reffay, Christophe and Miled, Mahdi and Ortiz, Pascal and F{\´e}vrier, Lo{\"i}c and Grgurina, Nataša and Weise, Martin and Bellettini, Carlo and Lonati, Violetta and Malchiodi, Dario and Monga, Mattia and Morpurgo, Anna and Torelli, Mauro and Planteu, Lukas and Standl, Bernhard and Grossmann, Wilfried and Neuwirth, Erich and Benacka, Jan and Ragonis, Noa and Hodges, Steve and Berry, Carol and Kusterer, Peter},
  title     = {Informatics in schools : local proceedings of the 6th International Conference ISSEP 2013 ; selected papers ; Oldenburg, Germany, February 26-March 2, 2013},
  editor    = {Diethelm, Ira and Arndt, Jannik and D{\"u}nnebier, Malte and Syrbe, J{\"o}rn},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-222-3},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-63688},
  pages     = {162},
  year      = {2013},
  abstract  = {The International Conference on Informatics in Schools: Situation, Evolution and Perspectives - ISSEP - is a forum for researchers and practitioners in the area of Informatics education, both in primary and secondary schools. It provides an opportunity for educators to reflect upon the goals and objectives of this subject, its curricula and various teaching/learning paradigms and topics, possible connections to everyday life and various ways of establishing Informatics Education in schools. This conference also cares about teaching/learning materials, various forms of assessment, traditional and innovative educational research designs, Informatics' contribution to the preparation of children for the 21st century, motivating competitions, projects and activities supporting informatics education in school.},
  language  = {en}
}