Institut für Informatik und Computational Science
Refine
Year of publication
Document Type
- Article (680)
- Doctoral Thesis (206)
- Monograph/Edited Volume (135)
- Other (28)
- Conference Proceeding (20)
- Master's Thesis (13)
- Part of a Book (12)
- Postprint (10)
- Preprint (5)
- Bachelor Thesis (1)
Keywords
- Informatik (18)
- Didaktik (15)
- Hochschuldidaktik (14)
- Ausbildung (13)
- answer set programming (13)
- Answer Set Programming (10)
- Answer set programming (10)
- E-Learning (8)
- Machine Learning (7)
- Maschinelles Lernen (7)
- Antwortmengenprogrammierung (6)
- education (6)
- Computer Science Education (5)
- Modellierung (5)
- higher education (5)
- Informatikdidaktik (4)
- Internet of Things (4)
- MQTT (4)
- Optimization (4)
- didactics (4)
- machine learning (4)
- security (4)
- Algorithms (3)
- Competence Measurement (3)
- DPLL (3)
- Digitale Medien (3)
- Digitalisierung (3)
- EEG (3)
- Equilibrium logic (3)
- Komplexität (3)
- Machine learning (3)
- Modeling (3)
- Ontologie (3)
- Secondary Education (3)
- Semantic Web (3)
- Softwareentwicklung (3)
- Theory (3)
- complexity (3)
- computer science education (3)
- formal languages (3)
- image processing (3)
- informatics (3)
- monitoring (3)
- relevance (3)
- teacher training (3)
- verification (3)
- 3D visualization (2)
- ASIC (2)
- Adaptivity (2)
- Adaptivität (2)
- Algorithmen (2)
- Analytical models (2)
- Assessment (2)
- Autismus (2)
- Automata systems (2)
- Automatisches Beweisen (2)
- Big Data (2)
- Bildungstechnologien (2)
- Bildverarbeitung (2)
- Code (2)
- Codierungstheorie (2)
- Competence Modelling (2)
- Complexity (2)
- Computational thinking (2)
- Computer Science (2)
- Computergrafik (2)
- Computersicherheit (2)
- Constraint Solving (2)
- Coq (2)
- Data Privacy (2)
- Debugging (2)
- Deduction (2)
- Deep Learning (2)
- E-learning (2)
- Educational Technologies (2)
- Event mapping (2)
- FMC (2)
- FPGA (2)
- Fault tolerance (2)
- Fehlererkennung (2)
- HCI (2)
- Hochschullehre (2)
- ICA (2)
- IT-Infrastruktur (2)
- Informatics (2)
- Informatics Education (2)
- Informatics Modelling (2)
- Informatics System Application (2)
- Informatics System Comprehension (2)
- Informatikstudium (2)
- Internet (2)
- Key Competencies (2)
- Klausellernen (2)
- Knowledge Representation and Reasoning (2)
- Konstruktivismus (2)
- Künstliche Intelligenz (2)
- Lernumgebung (2)
- Lindenmayer systems (2)
- Logic Programming (2)
- Logics (2)
- Mensch-Computer-Interaktion (2)
- Mensch-Technik-Interaktion (2)
- Methodik (2)
- Middleware (2)
- Modell (2)
- Modelling (2)
- Non-monotonic reasoning (2)
- Onlinelehre (2)
- Ontology (2)
- Optimierung (2)
- Parameterized complexity (2)
- Planing (2)
- Preference Handling (2)
- Process (2)
- Process mining (2)
- Prototyping (2)
- Prozess (2)
- Prozessmodellierung (2)
- Relevanz (2)
- ResNet (2)
- SAT (2)
- Scalability (2)
- Software Engineering (2)
- Strategie (2)
- Synthese (2)
- Systemstruktur (2)
- TPACK (2)
- Texturen (2)
- Theorembeweisen (2)
- Tracking (2)
- Treewidth (2)
- Unifikation (2)
- User Experience (2)
- Visualisierung (2)
- Vorhersage (2)
- abstraction (2)
- anti-cancer drugs (2)
- argument mining (2)
- authentication (2)
- automatic feedback (2)
- bioinformatics (2)
- code (2)
- computational thinking (2)
- computer graphics (2)
- concurrent checking (2)
- cooperating systems (2)
- deep neural networks (2)
- drug-sensitivity prediction (2)
- e-learning (2)
- edge computing (2)
- embedded systems (2)
- face tracking (2)
- facial expression (2)
- firmware update (2)
- geovisualization (2)
- human computer interaction (2)
- knowledge representation and nonmonotonic reasoning (2)
- lesson planning (2)
- lesson preparation (2)
- logic programming (2)
- maschinelles Lernen (2)
- model (2)
- non-photorealistic rendering (2)
- online learning (2)
- parsing (2)
- perception (2)
- perception differences (2)
- physical computing (2)
- policy evaluation (2)
- radhard design (2)
- reliability (2)
- scientific workflows (2)
- secondary computer science education (2)
- self-adaptive multiprocessing system (2)
- single event upset (2)
- software development (2)
- solar particle event (2)
- support system (2)
- systems biology (2)
- test (2)
- textures (2)
- theorem (2)
- tools (2)
- virtual 3D city models (2)
- virtual mobility (2)
- virtuelle 3D-Stadtmodelle (2)
- visualization (2)
- 'Peer To Peer' (1)
- (FPGA) (1)
- (SET) count rate (1)
- 13C metabolic flux analysis (1)
- 2-tag system (1)
- 21st century skills, (1)
- 3D Computer Grafik (1)
- 3D Computer Graphics (1)
- 3D Drucken (1)
- 3D Linsen (1)
- 3D Semiotik (1)
- 3D Visualisierung (1)
- 3D computer graphics (1)
- 3D lenses (1)
- 3D modeling (1)
- 3D printing (1)
- 3D semiotics (1)
- 3D-Stadtmodelle (1)
- 3d city models (1)
- 6LoWPAN (1)
- ABRACADABRA (1)
- ADFS (1)
- AODV (1)
- ARCS Modell (1)
- ASIC (Applikationsspezifische Integrierte Schaltkreise) (1)
- ASP (Answer Set Programming) (1)
- Abbrecherquote (1)
- Absorbed dose (1)
- Abstraction (1)
- Abstraktion (1)
- Accepting Grammars (1)
- Access Datenbank (1)
- Access control (1)
- Achievement (1)
- Ackerschmalwand (1)
- Active Directory Federation Services (1)
- Active Evaluation (1)
- Active evaluation (1)
- Activity Theory (1)
- Activity-orientated Learning (1)
- Ad hoc routing (1)
- Advanced Video Codec (AVC) (1)
- Adversarial Learning (1)
- Aggregates (1)
- Aktive Evaluierung (1)
- Akzeptierende Grammatiken (1)
- Algorithm configuration (1)
- Algorithm portfolios (1)
- Algorithmenablaufplanung (1)
- Algorithmenkonfiguration (1)
- Algorithmenselektion (1)
- Alignment (1)
- Android Security (1)
- Android hybrid apps (1)
- Angewandte Spieltheorie (1)
- Animal building (1)
- Anisotroper Kuwahara Filter (1)
- Anleitung (1)
- Answer Set Solving modulo Theories (1)
- Anti-cancer drugs (1)
- Antwortmengen Programmierung (1)
- App (1)
- Application Aggregation (1)
- Applications and Software Development (1)
- Applied Game Theory (1)
- Apps (1)
- Arabidopsis thaliana (1)
- Arduino (1)
- Argumentation (1)
- Argumentation structure (1)
- Artificial Intelligence (1)
- Artificial Neuronal Network (1)
- Aspect-Oriented Programming (1)
- Aspektorientierte Programmierung (1)
- Asynchrone Schaltung (1)
- Attention (1)
- Audience Response Systeme (1)
- Aufmerksamkeit (1)
- Aufzählung (1)
- Augenbewegungen (1)
- Augmentation (1)
- Augmented and virtual reality (1)
- Ausreissererkennung (1)
- Austria (1)
- Authentifizierung (1)
- Authorization (1)
- Autism (1)
- Automated Theorem Proving (1)
- Automated parallelization (1)
- Automatic Item Generation (1)
- Automatic UI Generation (1)
- Automatically controlled windows (1)
- Autorisierung (1)
- BCH (1)
- BCH code (1)
- BCH-Code (1)
- BCI (1)
- BSS (1)
- Bachelorstudierende der Informatik (1)
- Backdoors (1)
- Barcode (1)
- Batch processing (1)
- Baumweite (1)
- Bean (1)
- Behavior (1)
- Benchmark testing; (1)
- Benutzeroberfläche (1)
- Benutzungsschnittstellen Ontologien (1)
- Berliner Modell (1)
- Berührungseingaben (1)
- Betrachtungsebenen (1)
- Beweis (1)
- Beweisassistent (1)
- Beweistheorie (1)
- Beweisumgebung (1)
- Bilddatenanalyse (1)
- Bildung (1)
- Binäres Entscheidungsdiagramm (1)
- Bio-jETI (1)
- Biocomputing (1)
- Bioelektrisches Signal (1)
- Bioinformatik (1)
- Blended Learning (1)
- Blind users (1)
- Bloom’s Taxonomy (1)
- Boolean constraint solver (1)
- Boolean logic models (1)
- Boosting (1)
- Bot Detection (1)
- Brain Computer Interface (1)
- Business Process (1)
- Business Process Models (1)
- Business process intelligence (1)
- CASP (Constraint Answer Set Programming) (1)
- CP-Logic (1)
- CS concepts (1)
- CSC (1)
- Cactus (1)
- Campus (1)
- Capability approach (1)
- CertiCoq (1)
- Challenges (1)
- Chipkarten (1)
- Choreographien (1)
- Circuit faults (1)
- CityGML (1)
- Classification (1)
- Clause Learning (1)
- Clock tree (1)
- Cloud (1)
- Cloud Computing (1)
- Cloud computing (1)
- Cluster Computing (1)
- Cluster computing (1)
- Clusteranalyse (1)
- Code generation (1)
- Codierung (1)
- Coding theory (1)
- Cognitive Apprenticeship (1)
- Cognitive Skills (1)
- Coherent phonons (1)
- Combinatorial multi-objective optimization (1)
- Common Spatial Pattern (1)
- Competences (1)
- Competencies (1)
- Complementary Circuits (1)
- Complex optimization (1)
- Compliance (1)
- Composed UIs (1)
- Composition (1)
- Computational Complexity (1)
- Computational Science (1)
- Computational Thinking (1)
- Computational complexity (1)
- Computational grid (1)
- Computer Science in Context (1)
- Computer security (1)
- Computergestützes Training (1)
- Computing (1)
- Computing with DNA (1)
- Conceptual (1)
- Conformant Planning (1)
- Conrad Hal Waddington (1)
- Constraint (1)
- Constraint satisfaction (1)
- Constraint-Programmierung (1)
- Constructive solid geometry (1)
- Contest (1)
- Context awareness (1)
- Contextualisation (1)
- Contextualized learning (1)
- Continuous Testing (1)
- Continuous Versioning (1)
- Contradictions (1)
- Controlled Derivations (1)
- Convolution (1)
- Course timetabling (1)
- Covariate Shift (1)
- Curriculum (1)
- Curriculum Development (1)
- Curry (1)
- Customer ownership (1)
- D-galactosamine (1)
- DDoS (1)
- DMR (1)
- DNA (1)
- DNA computing (1)
- DNA hairpin formation (1)
- DNS (1)
- DRMAA (1)
- DRMS (1)
- Data Analysis (1)
- Data Management (1)
- Data federation (1)
- Database (1)
- Databases (1)
- Dateiformat (1)
- Datenschutz (1)
- Deal of the Day (1)
- Decidability (1)
- Declarative Problem Solving (1)
- Declare (1)
- Deep learning (1)
- Defining characteristics of physical computing (1)
- Dempster-Shafer-Theorie (1)
- Dempster–Shafer theory (1)
- Denotational semantics (1)
- Description Logics (1)
- Design (1)
- Design for testability (DFT) (1)
- Deskriptive Logik (1)
- Deutschland (1)
- Diagonalisierung (1)
- Dialog-based User Interfaces (1)
- Dialogbasierte Benutzerschnittstellen (1)
- Didaktik der Informatik (1)
- Didaktische Konzepte (1)
- Dienst-Ökosysteme (1)
- Dienstkomposition (1)
- Dienstplattform (1)
- Differenz von Gauss Filtern (1)
- Digital Competence (1)
- Digital Design (1)
- Digital Education (1)
- Digital Game Based Learning (1)
- Digital Media (1)
- Digital Revolution (1)
- Digital image analysis (1)
- Digitale Bibliothek (1)
- Digitalisation (1)
- Digitalization (1)
- Distributed Computing (1)
- Diversität (1)
- Dokument-Management-System (1)
- Domain-Specific Languages (1)
- Domänenspezifische Sprachen (1)
- Dose rate (1)
- Double cell upsets (DCUs) (1)
- Dreidimensionale Computergraphik (1)
- Dublin Core (1)
- Dynamic Programming (1)
- Dynamic assessment (1)
- Dynamical X-ray theory (1)
- Dynamische Programmierung (1)
- Dynamische Rekonfiguration (1)
- E-Assessment (1)
- E-Government (1)
- E-Klausuren (1)
- E-Portfolio (1)
- E-teaching (1)
- EDC (1)
- Early Literacy (1)
- Echtzeitanwendung (1)
- Edge Computing (1)
- Educational Standards (1)
- Educational game (1)
- Educational software (1)
- Educational timetabling (1)
- Eingabegenauigkeit (1)
- Eisenbahnnetz (1)
- Elektroencephalographie (1)
- Elektronisches Prüfen (1)
- Elektronisches Publizieren (1)
- Embedded Systems (1)
- Emotionen (1)
- Emotionsforschung (1)
- Encoding (1)
- Engines (1)
- Enterprise Architecture (1)
- Enterprise Search (1)
- Entity Linking (1)
- Entscheidungsbäume (1)
- Entwurf (1)
- Entwurfsmuster (1)
- Entwurfsmuster für SOA-Sicherheit (1)
- Entwurfsprinzipien (1)
- Entwurfsraumexploration (1)
- Epigenetic landscape (1)
- Epistemic Logic Programs (1)
- Erfüllbarkeit einer Formel der Aussagenlogik (1)
- Erfüllbarkeitsproblem (1)
- Erklärbarkeit (1)
- Error Estimation (1)
- Error-Detection Circuits (1)
- Euclid’s algorithm (1)
- European Bioinformatics Institute (1)
- Evaluation (1)
- Evaluierung semantischer Suchmaschinen (1)
- Evidenztheorie (1)
- Evolution (1)
- Experimentation (1)
- Explainability (1)
- Explicit negation (1)
- Exploration (1)
- Explore-first Programming (1)
- Exponential Time Hypothesis (1)
- Exponentialzeit Hypothese (1)
- Extensibility (1)
- Extreme Model-Driven Development (1)
- FEDC (1)
- FMC-QE (1)
- FOSS (1)
- Facebook (1)
- Fault Localization (1)
- Fault tolerant systems (1)
- Feature Combination (1)
- Feature extraction (1)
- Feedback (1)
- Fehlende Daten (1)
- Fehlerkorrektur (1)
- Fehlerschätzung (1)
- Fehlvorstellung (1)
- Fibonacci numbers (1)
- Field programmable gate arrays (1)
- Finite automata (1)
- Flip-flops (1)
- Flussgesteuerter Bilateraler Filter (1)
- Focus+Context Visualization (1)
- Fokus-&-Kontext Visualisierung (1)
- Forgetting (1)
- Formalismus (1)
- Formalitätsgrad (1)
- Formeln der quantifizierten Aussagenlogik (1)
- Forschendes Lernen (1)
- Forschungsdatenmanagement (1)
- Framework (1)
- Freshmen (1)
- Function (1)
- Fundamental Ideas (1)
- GERBIL (1)
- GIS-Dienstkomposition (1)
- GPU (1)
- Game-Design-Elemente (1)
- Game-based learning (1)
- Gamification (1)
- Gebrauchstauglichkeit (1)
- Gebäudemodelle (1)
- Gehirn-Computer-Schnittstelle (1)
- Geländemodelle (1)
- Generalisierung (1)
- Generative Programmierung (1)
- Generative Programming (1)
- Geodaten (1)
- Geometrieerzeugung (1)
- Geovisualisierung (1)
- Geräte-Treiber (1)
- Geschäftsprozess (1)
- Geschäftsprozessmodelle (1)
- Gesichtsausdruck (1)
- Gesteuerte Ableitungen (1)
- Gesture input (1)
- Gleichheit (1)
- Globus (1)
- Grammar Systems (1)
- Grammatikalische Inferenz (1)
- Grammatiksysteme (1)
- Graph Convolutional Neural Networks (1)
- Graph Embedding (1)
- Graph-basiertes Ranking (1)
- Graphensuche (1)
- Graphfärbung (1)
- Green computing (1)
- Grid (1)
- Grid Computing (1)
- Grounded theory (1)
- Grounding Theory (1)
- H.264 (1)
- HDI (1)
- Hairpin completions (1)
- Hairpin reductions (1)
- Hardware Design (1)
- Hardware accelerator (1)
- Hardware-Software-Co-Design (1)
- Hauptkomponentenanalyse (1)
- Heat diffusion (1)
- Heterogenität (1)
- Hierarchically configurable mask register (1)
- High-Level Synthesis (1)
- Histograms (1)
- Hochschul-Apps (1)
- Hochschul-Cloud (1)
- Hochschulbildung (1)
- Hochschulsystem (1)
- Https traffic (1)
- Human Factors (1)
- Human-Technology Interaction (1)
- Hurricane Sandy (1)
- Hybrid App (1)
- I/O-effiziente Algorithmen (1)
- ICT (1)
- ICT Competence (1)
- ICT competencies (1)
- ICT skills (1)
- IP core (1)
- IT security (1)
- IT-Security (1)
- IT-Sicherheit (1)
- IaaS (1)
- Identifiers (1)
- Image and video stylization (1)
- Image resolution (1)
- Imperative calculi (1)
- Improving classroom (1)
- Incoherent phonons (1)
- Incremental answer set programming (1)
- Industrie 4.0 (1)
- Industry 4.0 (1)
- Inference (1)
- Informatik-Studiengänge (1)
- Informatiksystem (1)
- Informatikunterricht (1)
- Informatikvoraussetzungen (1)
- Information Retrieval (1)
- Information Transfer Rate (1)
- Information federation (1)
- Information integration (1)
- Information retrieval (1)
- Information security (1)
- Informationsextraktion (1)
- Infrastruktur (1)
- Inkonsistenz (1)
- Innovation (1)
- Inquiry-based Learning (1)
- Inquiry-based learning (1)
- Insurance industry (1)
- Integrated circuit modeling (1)
- Integration (1)
- Interactive Rendering (1)
- Interactive system (1)
- Interaktionsmodel (1)
- Interaktionsmodellierung (1)
- Interaktionstechniken (1)
- Interaktives Rendering (1)
- Interaktives System (1)
- Interaktivität (1)
- Interface design (1)
- Internet Security (1)
- Internet applications (1)
- Internet-Sicherheit (1)
- Internetanwendungen (1)
- Interoperability (1)
- Interoperabilität (1)
- Interpretability (1)
- Interpretierbarkeit (1)
- Intuition (1)
- IoT (1)
- Java Security Framework (1)
- Job monitoring (1)
- Job submission (1)
- Kartografisches Design (1)
- Kern-PCA (1)
- Kernel (1)
- Kernelization (1)
- Kernmethoden (1)
- Key input (1)
- Klassifikation (1)
- Klassifikation mit großem Margin (1)
- Klassifikator-Kalibrierung (1)
- Klimafolgenanalyse (1)
- Klimawandel (1)
- Knowledge (1)
- Knowledge Management (1)
- Knowledge representation (1)
- Kommunikation (1)
- Kommunismus (1)
- Kompetenz (1)
- Kompetenzerwerb (1)
- Kompilation (1)
- Komplexitätsbewältigung (1)
- Komplexitätstheorie (1)
- Komposition (1)
- Konnektionskalkül (1)
- Konzeptionell (1)
- Kryptographie (1)
- Kybernetik (1)
- Künstliche Neuronale Netzwerke (1)
- L systems (1)
- LBA problem (1)
- LDPC code (1)
- LDPC-Code (1)
- LMS (1)
- Landmark visibility (1)
- Landmarken (1)
- Langzeitarchivierung (1)
- Large Margin Classification (1)
- Laser Cutten (1)
- Learners (1)
- Learning (1)
- Learning Analytics (1)
- Learning Fields (1)
- Learning ecology (1)
- Learning environment (1)
- Learning interfaces development (1)
- Learning with ICT (1)
- Lebenslanges Lernen (1)
- Leftmost Derivations (1)
- Lehre (1)
- Lehrer (1)
- Lehrer*innenbildung (1)
- Lehrkräfteausbildung (1)
- Leistungsfähigkeit (1)
- Leistungsvorhersage (1)
- Lern-App (1)
- Lernaufgaben (1)
- Lernen (1)
- Lernmotivation (1)
- Lernsoftware (1)
- Life-Long Learning (1)
- Liguistisch (1)
- Linked Data Anwendungen (1)
- Linked Data Application Modelling (1)
- Linksableitungen (1)
- Linux (1)
- Linux device drivers (1)
- Literature mining (1)
- Liver neoplasms (1)
- Load Balancing (1)
- Localization (1)
- Location awareness (1)
- Logarithm (1)
- Logic programming (1)
- Logik (1)
- Logikkalkül (1)
- Logiksynthese (1)
- Loss (1)
- Low Latency (1)
- Lower Bounds (1)
- Lower Secondary Level (1)
- Loyalty (1)
- M2M (1)
- MEG (1)
- MFA (1)
- MOOCs (1)
- Magnetoencephalographie (1)
- Malware (1)
- Markov processes (1)
- Masking of X-values (1)
- Massenklausuren (1)
- Massive Open Online Courses (1)
- Mathematical Optimization (1)
- Mathematikdidaktik (1)
- Mathematikphilosophie (1)
- Mathematische Optimierung (1)
- Matrizen-Eigenwertaufgabe (1)
- Measurement (1)
- Media in education (1)
- Megamodel (1)
- Megamodell (1)
- Mehrklassen-Klassifikation (1)
- Message Passing Interface (1)
- Meta-Programming (1)
- Metamodell (1)
- Methoden der semantischen Suche (1)
- Methodology (1)
- Metric learning (1)
- Migration (1)
- Minimal perturbation problems (1)
- Mischmodelle (1)
- Mischung <Signalverarbeitung> (1)
- Mobile App (1)
- Mobile Campus Application (1)
- Mobile Learning (1)
- Mobile application (1)
- Mobile devices (1)
- Mobile learning (1)
- Mobiles Lernen (1)
- Mobilgeräte (1)
- Model Based Engineering (1)
- Model Checking (1)
- Model Driven Architecture (1)
- Model Driven UI Development (1)
- Model Management (1)
- Model checking (1)
- Model-Driven Engineering (1)
- Model-Driven Software Development (1)
- Modell Management (1)
- Modell-driven Security (1)
- Modell-getriebene Sicherheit (1)
- Modellbasiert (1)
- Modellgetriebene Architektur (1)
- Modellgetriebene Entwicklung (1)
- Modellgetriebene Softwareentwicklung (1)
- Modellgetriebene UI Entwicklung (1)
- Molekulare Bioinformatik (1)
- Motivation (1)
- Multi Task Learning (1)
- Multi-Class (1)
- Multi-Task-Lernen (1)
- Multi-objective optimization (1)
- Multi-sided platforms (1)
- Multimedia (1)
- Multimodal User Interfaces (1)
- Multimodale Benutzerschnittstellen (1)
- Multiple interpretation scheme (1)
- Multiprocessor (1)
- Multiprozessor (1)
- Music Technology (1)
- N-temperature model (1)
- NETCONF (1)
- NFC (1)
- NUI (1)
- Nash equilibrium (1)
- Natural Science Education (1)
- Natural language processing (1)
- Natural ventilation (1)
- Navigation (1)
- Network (1)
- Network Management (1)
- Network security (1)
- Netzwerk (1)
- Netzwerk Management (1)
- Netzwerke (1)
- Neural networks (1)
- Neuronales Netz (1)
- New On-Line Error-Detection Methode (1)
- Next Generation Network (1)
- Nicht-photorealistisches Rendering (1)
- Nichtfotorealistische Bildsynthese (1)
- NoSQL (1)
- Non-Monotonic (1)
- Nonmonotonic reasoning (1)
- Norway (1)
- Novice programmers (1)
- Nutzungserlebnis (1)
- Nutzungsinteresse (1)
- OAI-PMH (1)
- OBI (1)
- OCCI (1)
- OSSE (1)
- Objektive Schwierigkeit (1)
- Omega (1)
- Ontologien (1)
- Ontologies (1)
- Open Badge Infrastructure (1)
- Open Badges (1)
- Open Source (1)
- OpenOLAT (1)
- Operation problem (1)
- Optimierungsproblem (1)
- Owner-Retained Access Control (ORAC) (1)
- Parallel Programming (1)
- Parallel SAT solving (1)
- Parallel job execution time estimation (1)
- Parallele Datenverarbeitung (1)
- Paralleles Rechnen (1)
- Parallelrechner (1)
- Parameterized Complexity (1)
- Parametrisierte Komplexität (1)
- Parsing (1)
- Particle detector (1)
- Partizipation (1)
- Patterns (1)
- Pedagogical content knowledge (1)
- Pedagogical issues (1)
- Pedestrian navigation (1)
- Peer-Review (1)
- Peer-to-Peer-Netz ; GRID computing ; Zuverlässigkeit ; Web Services ; Betriebsmittelverwaltung ; Migration (1)
- Performance (1)
- Performance Evaluation (1)
- Performance Prediction (1)
- Perl Formularskript (1)
- Personal Learning Environment (1)
- Personalization (1)
- Persönliche Lernumgebung (1)
- Pervasive computing (1)
- Pervasive game (1)
- Pervasive learning (1)
- Phantoms (1)
- Physical Science (1)
- Planar tactile display (1)
- Plant identification (1)
- Platzierung (1)
- Polarization (1)
- Policy Enforcement (1)
- Policy Languages (1)
- Policy Sprachen (1)
- Power Monitoring (1)
- Pre-RS Traceability (1)
- Prediction Game (1)
- Predictive Models (1)
- Preprocessing (1)
- Privacy Protection (1)
- Problem Solving (1)
- Probleme in der Studie (1)
- Problemlösen (1)
- Process Management (1)
- Process model analysis (1)
- Process modeling (1)
- Product lifecycle management (1)
- Professionalisierung (1)
- Professoren (1)
- Programmierung (1)
- Programming (1)
- Programming by optimization (1)
- Proof Theory (1)
- Prototyp (1)
- Prozess Verbesserung (1)
- Prozesse (1)
- Prozessmanagement (1)
- Prozessmodell (1)
- Prozesssynchronisierung (1)
- Prädiktionsspiel (1)
- Präferenzen (1)
- Prüfungsoptimierung (1)
- Publikationsserver (1)
- Quantenkryptographie (1)
- Quantified Boolean Formula (QBF) (1)
- Quantitative Modeling (1)
- Quantitative Modellierung (1)
- Queuing Theory (1)
- RADFET (1)
- RADFETs (1)
- REST (1)
- RSA triangle (1)
- Radiation hardness (1)
- Random access memory (1)
- Ranking (1)
- Reasoning (1)
- Recommendations for CS-Curricula in Higher Education (1)
- Reconfigurable (1)
- Reflexion (1)
- Region of Interest (1)
- Regression (1)
- Regularisierung (1)
- Regularization (1)
- Rekonfiguration (1)
- Rendering (1)
- Reparatur (1)
- Reproducibility of results (1)
- Reuseable UIs (1)
- Reversibility (1)
- SAMR (1)
- SET pulsewidth distribution (1)
- SMT (SAT Modulo Theories) (1)
- SOA (1)
- SOA Security Pattern (1)
- SSO (1)
- STG decomposition (1)
- STG-Dekomposition (1)
- SWOT (1)
- SaaSAbstract (1)
- Sample Selection Bias (1)
- Satisfiability (1)
- Scale-invariant feature transform (SIFT) (1)
- Scene graph systems (1)
- Schlüsselkompetenzen (1)
- Schulmaterial (1)
- Scientific images (1)
- Screen reader (1)
- Seamless learning (1)
- Search problems (1)
- Security (1)
- Security Modelling (1)
- Segmentierung (1)
- Selektion (1)
- Selektionsbias (1)
- Self-Checking Circuits (1)
- Self-adaptive MPSoC (1)
- Semantic Interoperability (1)
- Semantic Search (1)
- Semantic data (1)
- Semantic web (1)
- Semantik Web (1)
- Semantische Suche (1)
- Semilinearity property (1)
- Sensornetzwerke (1)
- Sensors (1)
- Sequence embeddings (1)
- Service Creation (1)
- Service Delivery Platform (1)
- Service Ecosystems (1)
- Service Oriented Architectures (1)
- Service convergence (1)
- Service orientation (1)
- Service-Orientierte Architekturen (1)
- Service-oriented Architecture (1)
- Service-oriented Architectures (1)
- Service-oriented architecture (1)
- Serviceorientierte Architektur (1)
- Shader (1)
- Sharing (1)
- Sicherheitsmodellierung (1)
- Signal Processing (1)
- Signal processing (1)
- Signaling transduction networks (1)
- Signalquellentrennung (1)
- Signaltrennung (1)
- Simulation (1)
- Simulations (1)
- Simultane Diagonalisierung (1)
- Single Event Transient (1)
- Single Sign On (1)
- Single Trial Analysis (1)
- Single event effect (1)
- Single event upsets (1)
- Single-event transient (SET) (1)
- Skalierbarkeit (1)
- Skelettberechnung (1)
- Small Private Online Courses (1)
- Social (1)
- Social Media Analysis (1)
- Software (1)
- Software architecture (1)
- Software-basierte Cache-Kohärenz (1)
- Softwarearchitektur (1)
- Sonnenteilchen-Ereignis (1)
- Spam (1)
- Spam Filtering (1)
- Spam-Erkennung (1)
- Spam-Filter (1)
- Spam-Filtering (1)
- Spatio-Spectral Filter (1)
- Spawning (1)
- Speicher (1)
- Spielbasiertes Lernen (1)
- Splicing (1)
- Splicing processor (1)
- Sprachdesign (1)
- Static Analysis (1)
- Statistical Tests (1)
- Statistical relational learning (1)
- Statistikprogramm R (1)
- Statistische Tests (1)
- Stilisierung (1)
- Stochastic relational process (1)
- Strahlungshartes Design (1)
- Strahlungshärte Entwurf (1)
- Stromverbrauchüberwachung (1)
- Strong equivalence (1)
- Structural equation modeling (1)
- Structuring (1)
- Strukturierung (1)
- Studentenerwartungen (1)
- Studentenhaltungen (1)
- Studentenjobs (1)
- Studienabbrecher (1)
- Studiendauer (1)
- Studieneinstieg (1)
- Studienorganisation (1)
- Suche (1)
- Support Vectors (1)
- Support-Vector Lernen (1)
- System Biologie (1)
- System structure (1)
- Systembiologie (1)
- Systementwurf (1)
- Systems biology (1)
- Systems of parallel communicating (1)
- Szenengraph (1)
- TMR (1)
- TPTP (1)
- Tailored UI Variants (1)
- Taktik (1)
- Tasks (1)
- Teacher perceptions (1)
- Teachers (1)
- Teaching information security (1)
- Technology proficiency (1)
- Teilnehmerzertifikate (1)
- Telekommunikation (1)
- Temporal Answer Set Solving (1)
- Temporal Logic (1)
- Temporallogik (1)
- Temporäre Anbindung (1)
- Terminologische Logik (1)
- Terminology (1)
- Test (1)
- Tests (1)
- Theoretische Informatik (1)
- Theoretischen Vorlesungen (1)
- Theory formation (1)
- Thermoelasticity (1)
- Time Augmented Petri Nets (1)
- Time Series Analysis (1)
- Time series (1)
- Tomography (1)
- Tool (1)
- Tools (1)
- Traceability (1)
- Traffic data (1)
- Transformation (1)
- Tree decomposition (1)
- Treewidth-aware reductions (1)
- Triple modular redundancy (TMR) (1)
- Tumor types (1)
- Turing machine (1)
- Type and effect systems (1)
- UAV imagery (1)
- UI Components (1)
- UI Metamodels (1)
- UI-Komponenten (1)
- UX (1)
- Ubiquitous learning (1)
- Ultrafast dynamics (1)
- Unabhängige Komponentenanalyse (1)
- Unary languages (1)
- Uniform Access Principle (1)
- University Service Bus (1)
- Universität Bagdad (1)
- Universität Potsdam (1)
- Universitätseinstellungen (1)
- Untere Schranken (1)
- Unterrichtswerkzeuge (1)
- Unvollständigkeit (1)
- Usability (1)
- Usability testing (1)
- Usage Interest (1)
- User Interface Ontologies (1)
- User Interfaces (1)
- User submission pattern (1)
- User-centred design (1)
- VGG16 (1)
- VM (1)
- Value network (1)
- Verhalten (1)
- Verification (1)
- Verifikation (1)
- Verletzung Auflösung (1)
- Verletzung Erklärung (1)
- Verteiltes Rechnen (1)
- Verteilungsunterschied (1)
- Violation Explanation (1)
- Violation Resolution (1)
- Virtual Reality (1)
- Virtual reality (1)
- Virtuelles 3D Stadtmodell (1)
- Visual metaphor (1)
- Vocational Education (1)
- Vorhersagemodelle (1)
- Wahrnehmung (1)
- Wahrnehmung von Arousal (1)
- Wahrnehmungsunterschiede (1)
- Warteschlangentheorie (1)
- Web Services (1)
- Web Sites (1)
- Web of Data (1)
- Webanwendung (1)
- Webseite (1)
- Weiterbildung (1)
- Well-structuredness (1)
- Wetterextreme (1)
- Wireless Sensor Networks (1)
- Wirtschaftsinformatik (1)
- Wissen (1)
- Wissenschaftlichesworkflows (1)
- Wissensmanagement (1)
- Wissensrepräsentation und -verarbeitung (1)
- Wissensrepräsentation und Schlussfolgerung (1)
- Wohlstrukturiertheit (1)
- Word embeddings (1)
- Workflow (1)
- X-masking (1)
- X-ray computed (1)
- X-values (1)
- Young People (1)
- ZQSA (1)
- ZQSAT (1)
- Zeitbehaftete Petri Netze (1)
- Zero-Suppressed Binary Decision Diagram (ZDD) (1)
- Zuverlässigkeitsanalyse (1)
- accepting grammars (1)
- action and change (1)
- activities (1)
- activity (1)
- acute liver failure (1)
- acyclicity properties (1)
- adaptiv (1)
- adaptive (1)
- adversarial classification (1)
- algorithm configuration (1)
- algorithm schedules (1)
- algorithm scheduling (1)
- algorithm selection (1)
- algorithms (1)
- analogical thinking (1)
- analysis (1)
- animated PCA (1)
- animierte PCA (1)
- anisotropic Kuwahara filter (1)
- annealing (1)
- anxiety (1)
- approximate joint diagonalization (1)
- approximate model counting (1)
- architecture (1)
- argumentation (1)
- argumentation structure (1)
- arithmethische Prozeduren (1)
- arithmetic procedures (1)
- arousal (1)
- arousal perception (1)
- artificial intelligence (1)
- artistic rendering (1)
- assistive Technologien (1)
- assistive technologies (1)
- asynchronous circuit (1)
- asynchrounous design (1)
- autism (1)
- automata (1)
- automated driving (1)
- automated guided vehicle routing (1)
- automated planning (1)
- automated theorem proving (1)
- automatic theorem prover (1)
- automatisierter Theorembeweiser (1)
- behavioral (1)
- behavioral abstraction (1)
- belief merging (1)
- belief revision (1)
- benchmark (1)
- bibliometric analysis (1)
- bild (1)
- binary representation (1)
- binary search (1)
- bio-computing (1)
- biometrics (1)
- biometrische Identifikation (1)
- blind source separation (1)
- block representation (1)
- bootstrapping (1)
- brain-computer interface (1)
- building models (1)
- bundled data (1)
- business informatics (1)
- camera sensor (1)
- car assembly operations (1)
- cartographic design (1)
- cellular automata (1)
- changing the study field (1)
- changing the university (1)
- choreographies (1)
- circuit Faults (1)
- citation analysis (1)
- classifier calibration (1)
- classroom language (1)
- classroom material (1)
- clause learning (1)
- click controller (1)
- climate change (1)
- climate impact analysis (1)
- clocks (1)
- clustering (1)
- co-citation analysis (1)
- co-occurrence analysis (1)
- code generation (1)
- cognitive apprenticeship (1)
- cognitive modifiability (1)
- coherence relation (1)
- coherence-enhancing filtering (1)
- collaborative learning (1)
- combinatorial optimization problems (1)
- combined task and motion planning (1)
- common spatial patterns (1)
- communication (1)
- competence (1)
- competencies (1)
- competency (1)
- competition (1)
- compilation (1)
- complex networks (1)
- compliance (1)
- comprehension (1)
- computational biology (1)
- computational methods (1)
- computer science teachers (1)
- computer security (1)
- computer vision (1)
- computergestützte Methoden (1)
- concession (1)
- conductive argument (1)
- connection calculus (1)
- connective (1)
- connectivity (1)
- consistency (1)
- consistency checking (1)
- consistency measures (1)
- constraint (1)
- constraint programming (1)
- constraints (1)
- constructivism (1)
- construktivism (1)
- context-free grammar (1)
- context-sensitive (1)
- continuous (1)
- contrast (1)
- controlled vocabularies (1)
- corpus analysis (1)
- correlated errors (1)
- course timetabling (1)
- craters (1)
- crop (1)
- cryptography (1)
- cs4fn (1)
- curriculum theory (1)
- debugging (1)
- decidability questions (1)
- decision trees (1)
- declarative problem solving (1)
- deep learning (1)
- deep residual networks (1)
- degree of formality (1)
- degree of non-context-freeness (1)
- degree of non-regularity (1)
- degree of non-regulation (1)
- depression (1)
- design (1)
- design flow (1)
- design principles (1)
- design space exploration (1)
- determinism (1)
- detrending (1)
- developmental systems (1)
- diagnosis (1)
- didaktische Rekonstruktion (1)
- didaktisches Konzept (1)
- difference of Gaussians (1)
- digital circuit (1)
- digital design (1)
- digitale Bildung (1)
- digitale Hochschullehre (1)
- digitale Medien (1)
- digitally-enabled pedagogies (1)
- divide and conquer (1)
- domain-specific APIs (1)
- dropout (1)
- drug discovery (1)
- dynamic (1)
- dynamic classification (1)
- dynamic reconfiguration (1)
- dynamic service binding (1)
- dynamisch (1)
- dynamische Klassifikation (1)
- e-Learning (1)
- e-mentoring (1)
- eGovernment (1)
- eLectures (1)
- economic ripples (1)
- education and public policy (1)
- educational programming (1)
- educational reconstruction (1)
- educational systems (1)
- educational timetabling (1)
- edutainment (1)
- eingebettete Systeme (1)
- einseitige Kommunikation (1)
- email spam detection (1)
- emission factor (1)
- emotion (1)
- emotion representation (1)
- emotion research (1)
- endothelin (1)
- endothelin-converting enzyme (1)
- ensemble kalman filter (1)
- ensemble methods (1)
- enterprise search (1)
- entity alignment (1)
- enumeration (1)
- environments (1)
- epistemic logic programs (1)
- epistemic specifications (1)
- equality (1)
- error correction (1)
- error detection (1)
- error propagation (1)
- evaluation (1)
- event-related desynchronization (1)
- evidence theory (1)
- evolution (1)
- explicit negation (1)
- exponentiation (1)
- external ambiguity (1)
- external memory algorithms (1)
- extreme weather (1)
- eye movements (1)
- fading (1)
- fault tolerance (1)
- field-programmable gate array (1)
- finite model computation (1)
- finite state sequential transducers (1)
- flow-based bilateral filter (1)
- formal (1)
- formal argumentation systems (1)
- formalism (1)
- freie Daten (1)
- freie Software (1)
- fun (1)
- functions (1)
- gait (1)
- game based learning (1)
- game design elements (1)
- game-based learning (1)
- gap-filling (1)
- generalization (1)
- geometry generation (1)
- geospatial data (1)
- geospatial services (1)
- global constraints (1)
- globale Constraints (1)
- governance (1)
- gradient boosting (1)
- grammar (1)
- grammar inference (1)
- graph analysis (1)
- graph clustering (1)
- graph-based ranking (1)
- graph-search (1)
- greenhouse gas (1)
- hardware accelerator (1)
- hardware architecture (1)
- hardware design (1)
- hardware-software-codesign (1)
- high school (1)
- high-throughput analysis (1)
- higher (1)
- human-technology interaction (1)
- hybrid (1)
- hybrid semantic search (1)
- hybrid solving (1)
- hybride semantische Suche (1)
- hybrides Problemlösen (1)
- ice harboring (1)
- image (1)
- image classification (1)
- image data analysis (1)
- image recognition (1)
- imaging (1)
- impacts (1)
- incompleteness (1)
- inconsistency (1)
- incremental SVM (1)
- independent component analysis (1)
- indirect economic impacts (1)
- indirekte ökonomische Effekte (1)
- informal and formal learning (1)
- informal logic (1)
- informatics education (1)
- information and communication technologies (1)
- information extraction (1)
- information flow control (1)
- information retrieval (1)
- informatische Bildung im Sekundarbereich (1)
- infrastructure (1)
- innovation (1)
- input accuracy (1)
- interaction modeling (1)
- interaction techniques (1)
- interactive course (1)
- interactive workshop (1)
- internal ambiguity (1)
- intrusion detection (1)
- intuition (1)
- irradiation (1)
- joint lab (1)
- kernel PCA (1)
- kernel methods (1)
- key competences in physical computing (1)
- key competencies (1)
- kidney cancer (1)
- kinaesthetic teaching (1)
- klinisch-praktischer Unterricht (1)
- knowledge representation and reasoning (1)
- konvergente Dienste (1)
- landmarks (1)
- language design (1)
- latches (1)
- lautes Denken (1)
- leanCoP (1)
- learning (1)
- learning environment (1)
- lebenslanges Lernen (1)
- leftmost derivations (1)
- linear code (1)
- linear programming (1)
- linearer Code (1)
- linguistic (1)
- locomotion (1)
- logic (1)
- logic programming methodology and applications (1)
- logic synthesis (1)
- logic-based modeling (1)
- logical calculus (1)
- logical errors (1)
- logical signaling networks (1)
- logische Ergänzung (1)
- logische Fehler (1)
- logische Programmierung (1)
- logische Signalnetzwerke (1)
- loop formulas (1)
- loose programming (1)
- loss propagation (1)
- lunar exploration (1)
- machine learning algorithms (1)
- macro-economic modelling (1)
- makroökonomische Modellierung (1)
- malware detection (1)
- manipulation planning (1)
- map/reduce (1)
- maschninelles Lernen (1)
- mathematics education (1)
- measure development (1)
- media (1)
- mediated learning experience (1)
- medical (1)
- medizinisch (1)
- meta model (1)
- metabolic network (1)
- metabolism (1)
- metabolomics (1)
- metadata (1)
- metastasis (1)
- methodology (1)
- middleware (1)
- misconception (1)
- mixture models (1)
- mobile Applikationen (1)
- mobile devices (1)
- mobile learning (1)
- mobile technologies and apps (1)
- mobiles Lernen (1)
- mobiles lernen (1)
- model-based (1)
- model-driven architecture (1)
- modeling (1)
- molecular networks (1)
- molekulare Netzwerke (1)
- multi core data processing (1)
- multi-class classification (1)
- multiuser (1)
- natural disasters (1)
- natural language generation (1)
- navigation (1)
- neighborhood (1)
- network (1)
- networks (1)
- networks-on-chip (1)
- neue Online-Fehlererkennungsmethode (1)
- neural networks (1)
- neutral endopeptidase (1)
- nichtlineare ICA (1)
- nichtlineare PCA (NLPCA) (1)
- nichtlineare Projektionen (1)
- non-monotonic reasoning (1)
- nonlinear ICA (1)
- nonlinear PCA (NLPCA) (1)
- nonlinear projections (1)
- nonphotorealistic rendering (NPR) (1)
- o-ambiguity (1)
- objective difficulty (1)
- omega (1)
- on-chip (1)
- on-farm evaluation (1)
- one-sided communication (1)
- oneM2M (1)
- oneM2M Ontology (1)
- online assistance (1)
- ontologies (1)
- open learning (1)
- open source (1)
- operating system (1)
- optimization (1)
- organisational evolution (1)
- outlier detection (1)
- output space compaction (1)
- overcomplete ICA (1)
- pMOS radiation dosimeter (1)
- paper prototyping (1)
- parallel processing (1)
- parallel programming (1)
- parallel rewriting (1)
- parallel solving (1)
- parallele Programmierung (1)
- paralleles Lösen (1)
- parameter (1)
- parity aggregate operator (1)
- pattern recognition (1)
- pdf forms (1)
- pedagogy (1)
- personal (1)
- personal response systems (1)
- philosophical foundation of informatics pedagogy (1)
- philosophy of mathematics (1)
- physical Computing (1)
- physical computing tools (1)
- placement (1)
- planning (1)
- platform (1)
- plug-ins (1)
- policy making (1)
- portfolio-based solving (1)
- pre-primary level (1)
- prediction (1)
- predictive models (1)
- preferences (1)
- premise acceptability (1)
- preprocessing (1)
- primary education (1)
- primary level (1)
- priorities (1)
- probabilistic deep learning (1)
- probabilistic deep metric learning (1)
- probabilistische tiefe neuronale Netze (1)
- probabilistisches tiefes metrisches Lernen (1)
- problem-solving (1)
- process (1)
- process improvement (1)
- process model (1)
- process model alignment (1)
- process modeling (1)
- process modelling (1)
- process synchronization (1)
- professional development (1)
- professors (1)
- program encodings (1)
- programmed grammars (1)
- programming (1)
- programming in context (1)
- projection (1)
- proof (1)
- proof assistant (1)
- proof complexity (1)
- proof environment (1)
- propagation probability (1)
- prototype (1)
- proving (1)
- pruritus (1)
- pulse stretching inverters (1)
- quality of life (1)
- quantum (1)
- quantum cryptography (1)
- radiation hardness (1)
- radiation hardness design (1)
- railway network (1)
- random forest (1)
- real arguments (1)
- real-time (1)
- real-time application (1)
- real-time mapping (1)
- real-walking (1)
- reconfiguration (1)
- reference (1)
- referential effectiveness (1)
- regression (1)
- regular language (1)
- regulation (1)
- rekonfigurierbar (1)
- reliability analysis (1)
- reliability assessment (1)
- repair (1)
- resources (1)
- restricted parallelism (1)
- risk analysis (1)
- robust ICA (1)
- robuste ICA (1)
- safety (1)
- satisfiability (1)
- scheduling (1)
- search (1)
- secondary education (1)
- segmentation (1)
- selbstanpassendes Multiprozessorsystem (1)
- selbstprüfende Schaltungen (1)
- selection (1)
- selective fault tolerance (1)
- self-checking (1)
- self-efficacy (1)
- semantic domain modeling (1)
- semantic ranking (1)
- semantic search (1)
- semantic search evaluation (1)
- semantic search methods (1)
- semantic web (1)
- semantische Domänenmodellierung (1)
- semantische Suche (1)
- semantisches Netz (1)
- semantisches Ranking (1)
- sensitivity (1)
- service composition (1)
- shader (1)
- sign language (1)
- simplicity (1)
- single event upsets (1)
- single-event transient (1)
- single-trial-analysis (1)
- site-specific weed management (1)
- skeletonization (1)
- sleep quality (1)
- smart farming (1)
- smartphone (1)
- social media (1)
- socio-technical system (1)
- soft errors (1)
- software (1)
- software engineering (1)
- software-based cache coherence (1)
- sozio-technisches System (1)
- space missions (1)
- speed independence (1)
- stable model semantics (1)
- state complexity (1)
- static analysis (1)
- static prediction games (1)
- statistics program R (1)
- strahleninduzierte Einzelereignis-Effekte (1)
- strong equivalence (1)
- structured output prediction (1)
- strukturierte Vorhersage (1)
- student activation (1)
- student experience (1)
- student perceptions (1)
- students’ conceptions (1)
- students’ knowledge (1)
- study problems (1)
- stylization (1)
- sufficiency (1)
- suicidal ideations (1)
- supply chains (1)
- support vector machines (1)
- synthesis (1)
- systematic (1)
- systematisch (1)
- tableau calculi (1)
- tactic (1)
- teacher competencies (1)
- teachers (1)
- teaching (1)
- teaching informatics in general education (1)
- technical notes and rapid communications (1)
- technische Rahmenbedingungen (1)
- tele-teaching (1)
- temporary binding (1)
- terrain models (1)
- test response compaction (1)
- theory (1)
- theory of computation (1)
- think aloud (1)
- timing (1)
- tools for teaching (1)
- topics (1)
- touch input (1)
- tptp (1)
- tracing (1)
- transformation (1)
- transient Faults (1)
- transient analysis (1)
- triangulated irregular networks (1)
- triple modular redundancy (1)
- tutorial section (1)
- unfounded sets (1)
- unidirektionale Fehler (1)
- unification (1)
- university education (1)
- user experience (1)
- user interfaces (1)
- user-centred (1)
- video annotation (1)
- virtual 3D city model (1)
- virtual machine (1)
- virtual reality (1)
- weather extremes (1)
- wheat crops (1)
- work productivity (1)
- workflow management (1)
- xAPI (1)
- yellow rust (1)
- zero-aliasing (1)
- überbestimmte ICA (1)
- ‘unplugged’ computing (1)
Institute
- Institut für Informatik und Computational Science (1112)
- Hasso-Plattner-Institut für Digital Engineering gGmbH (19)
- Extern (7)
- Institut für Physik und Astronomie (2)
- Universitätsbibliothek (2)
- Zentrum für Qualitätsentwicklung in Lehre und Studium (ZfQ) (2)
- eLiS - E-Learning in Studienbereichen (2)
- Department Erziehungswissenschaft (1)
- Department Linguistik (1)
- Fachgruppe Betriebswirtschaftslehre (1)
Service-oriented Architectures (SOA) facilitate the provision and orchestration of business services to enable a faster adoption to changing business demands. Web Services provide a technical foundation to implement this paradigm on the basis of XML-messaging. However, the enhanced flexibility of message-based systems comes along with new threats and risks. To face these issues, a variety of security mechanisms and approaches is supported by the Web Service specifications. The usage of these security mechanisms and protocols is configured by stating security requirements in security policies. However, security policy languages for SOA are complex and difficult to create due to the expressiveness of these languages. To facilitate and simplify the creation of security policies, this thesis presents a model-driven approach that enables the generation of complex security policies on the basis of simple security intentions. SOA architects can specify these intentions in system design models and are not required to deal with complex technical security concepts. The approach introduced in this thesis enables the enhancement of any system design modelling languages – for example FMC or BPMN – with security modelling elements. The syntax, semantics, and notion of these elements is defined by our security modelling language SecureSOA. The metamodel of this language provides extension points to enable the integration into system design modelling languages. In particular, this thesis demonstrates the enhancement of FMC block diagrams with SecureSOA. To enable the model-driven generation of security policies, a domain-independent policy model is introduced in this thesis. This model provides an abstraction layer for security policies. Mappings are used to perform the transformation from our model to security policy languages. However, expert knowledge is required to generate instances of this model on the basis of simple security intentions. Appropriate security mechanisms, protocols and options must be chosen and combined to fulfil these security intentions. In this thesis, a formalised system of security patterns is used to represent this knowledge and to enable an automated transformation process. Moreover, a domain-specific language is introduced to state security patterns in an accessible way. On the basis of this language, a system of security configuration patterns is provided to transform security intentions related to data protection and identity management. The formal semantics of the security pattern language enable the verification of the transformation process introduced in this thesis and prove the correctness of the pattern application. Finally, our SOA Security LAB is presented that demonstrates the application of our model-driven approach to facilitate a dynamic creation, configuration, and execution of secure Web Service-based composed applications.
Structuring process models
(2012)
One can fairly adopt the ideas of Donald E. Knuth to conclude that process modeling is both a science and an art. Process modeling does have an aesthetic sense. Similar to composing an opera or writing a novel, process modeling is carried out by humans who undergo creative practices when engineering a process model. Therefore, the very same process can be modeled in a myriad number of ways. Once modeled, processes can be analyzed by employing scientific methods. Usually, process models are formalized as directed graphs, with nodes representing tasks and decisions, and directed arcs describing temporal constraints between the nodes. Common process definition languages, such as Business Process Model and Notation (BPMN) and Event-driven Process Chain (EPC) allow process analysts to define models with arbitrary complex topologies. The absence of structural constraints supports creativity and productivity, as there is no need to force ideas into a limited amount of available structural patterns. Nevertheless, it is often preferable that models follow certain structural rules. A well-known structural property of process models is (well-)structuredness. A process model is (well-)structured if and only if every node with multiple outgoing arcs (a split) has a corresponding node with multiple incoming arcs (a join), and vice versa, such that the set of nodes between the split and the join induces a single-entry-single-exit (SESE) region; otherwise the process model is unstructured. The motivations for well-structured process models are manifold: (i) Well-structured process models are easier to layout for visual representation as their formalizations are planar graphs. (ii) Well-structured process models are easier to comprehend by humans. (iii) Well-structured process models tend to have fewer errors than unstructured ones and it is less probable to introduce new errors when modifying a well-structured process model. (iv) Well-structured process models are better suited for analysis with many existing formal techniques applicable only for well-structured process models. (v) Well-structured process models are better suited for efficient execution and optimization, e.g., when discovering independent regions of a process model that can be executed concurrently. Consequently, there are process modeling languages that encourage well-structured modeling, e.g., Business Process Execution Language (BPEL) and ADEPT. However, the well-structured process modeling implies some limitations: (i) There exist processes that cannot be formalized as well-structured process models. (ii) There exist processes that when formalized as well-structured process models require a considerable duplication of modeling constructs. Rather than expecting well-structured modeling from start, we advocate for the absence of structural constraints when modeling. Afterwards, automated methods can suggest, upon request and whenever possible, alternative formalizations that are "better" structured, preferably well-structured. In this thesis, we study the problem of automatically transforming process models into equivalent well-structured models. The developed transformations are performed under a strong notion of behavioral equivalence which preserves concurrency. The findings are implemented in a tool, which is publicly available.
Die öffentliche Verwaltung setzt seit mehreren Jahren E-Government-Anwendungssysteme ein, um ihre Verwaltungsprozesse intensiver mit moderner Informationstechnik zu unterstützen. Da die öffentliche Verwaltung in ihrem Handeln in besonderem Maße an Recht und Gesetz gebunden ist verstärkt und verbreitet sich der Zusammenhang zwischen den Gesetzen und Rechtsvorschriften einerseits und der zur Aufgabenunterstützung eingesetzten Informationstechnik andererseits. Aus Sicht der Softwaretechnik handelt es sich bei diesem Zusammenhang um eine spezielle Form der Verfolgbarkeit von Anforderungen (engl. Traceability), die so genannte Verfolgbarkeit im Vorfeld der Anforderungsspezifikation (Pre-Requirements Specification Traceability, kurz Pre-RS Traceability), da sie Aspekte betrifft, die relevant sind, bevor die Anforderungen in eine Spezifikation eingeflossen sind (Ursprünge von Anforderungen). Der Ansatz dieser Arbeit leistet einen Beitrag zur Verfolgbarkeit im Vorfeld der Anforderungsspezifikation von E-Government-Anwendungssystemen. Er kombiniert dazu aktuelle Entwicklungen und Standards (insbesondere des World Wide Web Consortium und der Object Management Group) aus den Bereichen Verfolgbarkeit von Anforderungen, Semantic Web, Ontologiesprachen und modellgetriebener Softwareentwicklung. Der Lösungsansatz umfasst eine spezielle Ontologie des Verwaltungshandeln, die mit den Techniken, Methoden und Werkzeugen des Semantic Web eingesetzt wird, um in Texten von Rechtsvorschriften relevante Ursprünge von Anforderungen durch Annotationen mit einer definierten Semantik zu versehen. Darauf aufbauend wird das Ontology Definition Metamodel (ODM) verwendet, um die Annotationen als spezielle Individuen einer Ontologie auf Elemente der Unified Modeling Language (UML) abzubilden. Dadurch entsteht ein neuer Modelltyp Pre-Requirements Model (PRM), der das Vorfeld der Anforderungsspezifikation formalisiert. Modelle diesen Typs können auch verwendet werden, um Aspekte zu formalisieren die sich nicht oder nicht vollständig aus dem Text der Rechtsvorschrift ergeben. Weiterhin bietet das Modell die Möglichkeit zum Anschluss an die modellgetriebene Softwareentwicklung. In der Arbeit wird deshalb eine Erweiterung der Model Driven Architecture (MDA) vorgeschlagen. Zusätzlich zu den etablierten Modelltypen Computation Independent Model (CIM), Platform Independent Model (PIM) und Platform Specific Model (PSM) könnte der Einsatz des PRM Vorteile für die Verfolgbarkeit bringen. Wird die MDA mit dem PRM auf das Vorfeld der Anforderungsspezifikation ausgeweitet, kann eine Transformation des PRM in ein CIM als initiale Anforderungsspezifikation erfolgen, indem der MOF Query View Transformation Standard (QVT) eingesetzt wird. Als Teil des QVT-Standards ist die Aufzeichnung von Verfolgbarkeitsinformationen bei Modelltransformationen verbindlich. Um die semantische Lücke zwischen PRM und CIM zu überbrücken, erfolgt analog zum Einsatz des Plattformmodells (PM) in der PIM nach PSM Transformation der Einsatz spezieller Hilfsmodelle. Es kommen dafür die im Projekt "E-LoGo" an der Universität Potsdam entwickelten Referenzmodelle zum Einsatz. Durch die Aufzeichnung der Abbildung annotierter Textelemente auf Elemente im PRM und der Transformation der Elemente des PRM in Elemente des CIM kann durchgängige Verfolgbarkeit im Vorfeld der Anforderungsspezifikation erreicht werden. Der Ansatz basiert auf einer so genannten Verfolgbarkeitsdokumentation in Form verlinkter Hypertextdokumente, die mittels XSL-Stylesheet erzeugt wurden und eine Verbindung zur graphischen Darstellung des Diagramms (z. B. Anwendungsfall-, Klassendiagramm der UML) haben. Der Ansatz unterstützt die horizontale Verfolgbarkeit zwischen Elementen unterschiedlicher Modelle vorwärts- und rückwärtsgerichtet umfassend. Er bietet außerdem vertikale Verfolgbarkeit, die Elemente des gleichen Modells und verschiedener Modellversionen in Beziehung setzt. Über den offensichtlichen Nutzen einer durchgängigen Verfolgbarkeit im Vorfeld der Anforderungsspezifikation (z. B. Analyse der Auswirkungen einer Gesetzesänderung, Berücksichtigung des vollständigen Kontextes einer Anforderung bei ihrer Priorisierung) hinausgehend, bietet diese Arbeit eine erste Ansatzmöglichkeit für eine Feedback-Schleife im Prozess der Gesetzgebung. Stehen beispielsweise mehrere gleichwertige Gestaltungsoptionen eines Gesetzes zur Auswahl, können die Auswirkungen jeder Option analysiert und der Aufwand ihrer Umsetzung in E-Government-Anwendungen als Auswahlkriterium berücksichtigt werden. Die am 16. März 2011 in Kraft getretene Änderung des NKRG schreibt eine solche Analyse des so genannten „Erfüllungsaufwands“ für Teilbereiche des Verwaltungshandelns bereits heute verbindlich vor. Für diese Analyse kann die vorliegende Arbeit einen Ansatz bieten, um zu fundierten Aussagen über den Änderungsaufwand eingesetzter E-Government-Anwendungssysteme zu kommen.
Answer Set Programming (ASP) is an emerging paradigm for declarative programming, in which a computational problem is specified by a logic program such that particular models, called answer sets, match solutions. ASP faces a growing range of applications, demanding for high-performance tools able to solve complex problems. ASP integrates ideas from a variety of neighboring fields. In particular, automated techniques to search for answer sets are inspired by Boolean Satisfiability (SAT) solving approaches. While the latter have firm proof-theoretic foundations, ASP lacks formal frameworks for characterizing and comparing solving methods. Furthermore, sophisticated search patterns of modern SAT solvers, successfully applied in areas like, e.g., model checking and verification, are not yet established in ASP solving. We address these deficiencies by, for one, providing proof-theoretic frameworks that allow for characterizing, comparing, and analyzing approaches to answer set computation. For another, we devise modern ASP solving algorithms that integrate and extend state-of-the-art techniques for Boolean constraint solving. We thus contribute to the understanding of existing ASP solving approaches and their interconnections as well as to their enhancement by incorporating sophisticated search patterns. The central idea of our approach is to identify atomic as well as composite constituents of a propositional logic program with Boolean variables. This enables us to describe fundamental inference steps, and to selectively combine them in proof-theoretic characterizations of various ASP solving methods. In particular, we show that different concepts of case analyses applied by existing ASP solvers implicate mutual exponential separations regarding their best-case complexities. We also develop a generic proof-theoretic framework amenable to language extensions, and we point out that exponential separations can likewise be obtained due to case analyses on them. We further exploit fundamental inference steps to derive Boolean constraints characterizing answer sets. They enable the conception of ASP solving algorithms including search patterns of modern SAT solvers, while also allowing for direct technology transfers between the areas of ASP and SAT solving. Beyond the search for one answer set of a logic program, we address the enumeration of answer sets and their projections to a subvocabulary, respectively. The algorithms we develop enable repetition-free enumeration in polynomial space without being intrusive, i.e., they do not necessitate any modifications of computations before an answer set is found. Our approach to ASP solving is implemented in clasp, a state-of-the-art Boolean constraint solver that has successfully participated in recent solver competitions. Although we do here not address the implementation techniques of clasp or all of its features, we present the principles of its success in the context of ASP solving.
Im Mittelpunkt dieser Arbeit stehen virtuelle 3D-Stadtmodelle, die Objekte, Phänomene und Prozesse in urbanen Räumen in digitaler Form repräsentieren. Sie haben sich zu einem Kernthema von Geoinformationssystemen entwickelt und bilden einen zentralen Bestandteil geovirtueller 3D-Welten. Virtuelle 3D-Stadtmodelle finden nicht nur Verwendung als Mittel für Experten in Bereichen wie Stadtplanung, Funknetzplanung, oder Lärmanalyse, sondern auch für allgemeine Nutzer, die realitätsnah dargestellte virtuelle Städte in Bereichen wie Bürgerbeteiligung, Tourismus oder Unterhaltung nutzen und z. B. in Anwendungen wie GoogleEarth eine räumliche Umgebung intuitiv erkunden und durch eigene 3D-Modelle oder zusätzliche Informationen erweitern. Die Erzeugung und Darstellung virtueller 3D-Stadtmodelle besteht aus einer Vielzahl von Prozessschritten, von denen in der vorliegenden Arbeit zwei näher betrachtet werden: Texturierung und Visualisierung. Im Bereich der Texturierung werden Konzepte und Verfahren zur automatischen Ableitung von Fototexturen aus georeferenzierten Schrägluftbildern sowie zur Speicherung oberflächengebundener Daten in virtuellen 3D-Stadtmodellen entwickelt. Im Bereich der Visualisierung werden Konzepte und Verfahren für die multiperspektivische Darstellung sowie für die hochqualitative Darstellung nichtlinearer Projektionen virtueller 3D-Stadtmodelle in interaktiven Systemen vorgestellt. Die automatische Ableitung von Fototexturen aus georeferenzierten Schrägluftbildern ermöglicht die Veredelung vorliegender virtueller 3D-Stadtmodelle. Schrägluftbilder bieten sich zur Texturierung an, da sie einen Großteil der Oberflächen einer Stadt, insbesondere Gebäudefassaden, mit hoher Redundanz erfassen. Das Verfahren extrahiert aus dem verfügbaren Bildmaterial alle Ansichten einer Oberfläche und fügt diese pixelpräzise zu einer Textur zusammen. Durch Anwendung auf alle Oberflächen wird das virtuelle 3D-Stadtmodell flächendeckend texturiert. Der beschriebene Ansatz wurde am Beispiel des offiziellen Berliner 3D-Stadtmodells sowie der in GoogleEarth integrierten Innenstadt von München erprobt. Die Speicherung oberflächengebundener Daten, zu denen auch Texturen zählen, wurde im Kontext von CityGML, einem international standardisierten Datenmodell und Austauschformat für virtuelle 3D-Stadtmodelle, untersucht. Es wird ein Datenmodell auf Basis computergrafischer Konzepte entworfen und in den CityGML-Standard integriert. Dieses Datenmodell richtet sich dabei an praktischen Anwendungsfällen aus und lässt sich domänenübergreifend verwenden. Die interaktive multiperspektivische Darstellung virtueller 3D-Stadtmodelle ergänzt die gewohnte perspektivische Darstellung nahtlos um eine zweite Perspektive mit dem Ziel, den Informationsgehalt der Darstellung zu erhöhen. Diese Art der Darstellung ist durch die Panoramakarten von H. C. Berann inspiriert; Hauptproblem ist die Übertragung des multiperspektivischen Prinzips auf ein interaktives System. Die Arbeit stellt eine technische Umsetzung dieser Darstellung für 3D-Grafikhardware vor und demonstriert die Erweiterung von Vogel- und Fußgängerperspektive. Die hochqualitative Darstellung nichtlinearer Projektionen beschreibt deren Umsetzung auf 3D-Grafikhardware, wobei neben der Bildwiederholrate die Bildqualität das wesentliche Entwicklungskriterium ist. Insbesondere erlauben die beiden vorgestellten Verfahren, dynamische Geometrieverfeinerung und stückweise perspektivische Projektionen, die uneingeschränkte Nutzung aller hardwareseitig verfügbaren, qualitätssteigernden Funktionen wie z.~B. Bildraumgradienten oder anisotroper Texturfilterung. Beide Verfahren sind generisch und unterstützen verschiedene Projektionstypen. Sie ermöglichen die anpassungsfreie Verwendung gängiger computergrafischer Effekte wie Stilisierungsverfahren oder prozeduraler Texturen für nichtlineare Projektionen bei optimaler Bildqualität. Die vorliegende Arbeit beschreibt wesentliche Technologien für die Verarbeitung virtueller 3D-Stadtmodelle: Zum einen lassen sich mit den Ergebnissen der Arbeit Texturen für virtuelle 3D-Stadtmodelle automatisiert herstellen und als eigenständige Attribute in das virtuelle 3D-Stadtmodell einfügen. Somit trägt diese Arbeit dazu bei, die Herstellung und Fortführung texturierter virtueller 3D-Stadtmodelle zu verbessern. Zum anderen zeigt die Arbeit Varianten und technische Lösungen für neuartige Projektionstypen für virtueller 3D-Stadtmodelle in interaktiven Visualisierungen. Solche nichtlinearen Projektionen stellen Schlüsselbausteine dar, um neuartige Benutzungsschnittstellen für und Interaktionsformen mit virtuellen 3D-Stadtmodellen zu ermöglichen, insbesondere für mobile Geräte und immersive Umgebungen.
The modeling and evaluation calculus FMC-QE, the Fundamental Modeling Concepts for Quanti-tative Evaluation [1], extends the Fundamental Modeling Concepts (FMC) for performance modeling and prediction. In this new methodology, the hierarchical service requests are in the main focus, because they are the origin of every service provisioning process. Similar to physics, these service requests are a tuple of value and unit, which enables hierarchical service request transformations at the hierarchical borders and therefore the hierarchical modeling. Through reducing the model complexity of the models by decomposing the system in different hierarchical views, the distinction between operational and control states and the calculation of the performance values on the assumption of the steady state, FMC-QE has a scalable applica-bility on complex systems. According to FMC, the system is modeled in a 3-dimensional hierarchical representation space, where system performance parameters are described in three arbitrarily fine-grained hierarchi-cal bipartite diagrams. The hierarchical service request structures are modeled in Entity Relationship Diagrams. The static server structures, divided into logical and real servers, are de-scribed as Block Diagrams. The dynamic behavior and the control structures are specified as Petri Nets, more precisely Colored Time Augmented Petri Nets. From the structures and pa-rameters of the performance model, a hierarchical set of equations is derived. The calculation of the performance values is done on the assumption of stationary processes and is based on fundamental laws of the performance analysis: Little's Law and the Forced Traffic Flow Law. Little's Law is used within the different hierarchical levels (horizontal) and the Forced Traffic Flow Law is the key to the dependencies among the hierarchical levels (vertical). This calculation is suitable for complex models and allows a fast (re-)calculation of different performance scenarios in order to support development and configuration decisions. Within the Research Group Zorn at the Hasso Plattner Institute, the work is embedded in a broader research in the development of FMC-QE. While this work is concentrated on the theoretical background, description and definition of the methodology as well as the extension and validation of the applicability, other topics are in the development of an FMC-QE modeling and evaluation tool and the usage of FMC-QE in the design of an adaptive transport layer in order to fulfill Quality of Service and Service Level Agreements in volatile service based environments. This thesis contains a state-of-the-art, the description of FMC-QE as well as extensions of FMC-QE in representative general models and case studies. In the state-of-the-art part of the thesis in chapter 2, an overview on existing Queueing Theory and Time Augmented Petri Net models and other quantitative modeling and evaluation languages and methodologies is given. Also other hierarchical quantitative modeling frameworks will be considered. The description of FMC-QE in chapter 3 consists of a summary of the foundations of FMC-QE, basic definitions, the graphical notations, the FMC-QE Calculus and the modeling of open queueing networks as an introductory example. The extensions of FMC-QE in chapter 4 consist of the integration of the summation method in order to support the handling of closed networks and the modeling of multiclass and semaphore scenarios. Furthermore, FMC-QE is compared to other performance modeling and evaluation approaches. In the case study part in chapter 5, proof-of-concept examples, like the modeling of a service based search portal, a service based SAP NetWeaver application and the Axis2 Web service framework will be provided. Finally, conclusions are given by a summary of contributions and an outlook on future work in chapter 6. [1] Werner Zorn. FMC-QE - A New Approach in Quantitative Modeling. In Hamid R. Arabnia, editor, Procee-dings of the International Conference on Modeling, Simulation and Visualization Methods (MSV 2007) within WorldComp ’07, pages 280 – 287, Las Vegas, NV, USA, June 2007. CSREA Press. ISBN 1-60132-029-9.
Die automatische Informationsextraktion (IE) aus unstrukturierten Texten ermöglicht völlig neue Wege, auf relevante Informationen zuzugreifen und deren Inhalte zu analysieren, die weit über bisherige Verfahren zur Stichwort-basierten Dokumentsuche hinausgehen. Die Entwicklung von Programmen zur Extraktion von maschinenlesbaren Daten aus Texten erfordert jedoch nach wie vor die Entwicklung von domänenspezifischen Extraktionsprogrammen. Insbesondere im Bereich der Enterprise Search (der Informationssuche im Unternehmensumfeld), in dem eine große Menge von heterogenen Dokumenttypen existiert, ist es oft notwendig ad-hoc Programm-module zur Extraktion von geschäftsrelevanten Entitäten zu entwickeln, die mit generischen Modulen in monolithischen IE-Systemen kombiniert werden. Dieser Umstand ist insbesondere kritisch, da potentiell für jeden einzelnen Anwendungsfall ein von Grund auf neues IE-System entwickelt werden muss. Die vorliegende Dissertation untersucht die effiziente Entwicklung und Ausführung von IE-Systemen im Kontext der Enterprise Search und effektive Methoden zur Ausnutzung bekannter strukturierter Daten im Unternehmenskontext für die Extraktion und Identifikation von geschäftsrelevanten Entitäten in Doku-menten. Grundlage der Arbeit ist eine neuartige Plattform zur Komposition von IE-Systemen auf Basis der Beschreibung des Datenflusses zwischen generischen und anwendungsspezifischen IE-Modulen. Die Plattform unterstützt insbesondere die Entwicklung und Wiederverwendung von generischen IE-Modulen und zeichnet sich durch eine höhere Flexibilität und Ausdrucksmächtigkeit im Vergleich zu vorherigen Methoden aus. Ein in der Dissertation entwickeltes Verfahren zur Dokumentverarbeitung interpretiert den Daten-austausch zwischen IE-Modulen als Datenströme und ermöglicht damit eine weitgehende Parallelisierung von einzelnen Modulen. Die autonome Ausführung der Module führt zu einer wesentlichen Beschleu-nigung der Verarbeitung von Einzeldokumenten und verbesserten Antwortzeiten, z. B. für Extraktions-dienste. Bisherige Ansätze untersuchen lediglich die Steigerung des durchschnittlichen Dokumenten-durchsatzes durch verteilte Ausführung von Instanzen eines IE-Systems. Die Informationsextraktion im Kontext der Enterprise Search unterscheidet sich z. B. von der Extraktion aus dem World Wide Web dadurch, dass in der Regel strukturierte Referenzdaten z. B. in Form von Unternehmensdatenbanken oder Terminologien zur Verfügung stehen, die oft auch die Beziehungen von Entitäten beschreiben. Entitäten im Unternehmensumfeld haben weiterhin bestimmte Charakteristiken: Eine Klasse von relevanten Entitäten folgt bestimmten Bildungsvorschriften, die nicht immer bekannt sind, auf die aber mit Hilfe von bekannten Beispielentitäten geschlossen werden kann, so dass unbekannte Entitäten extrahiert werden können. Die Bezeichner der anderen Klasse von Entitäten haben eher umschreibenden Charakter. Die korrespondierenden Umschreibungen in Texten können variieren, wodurch eine Identifikation derartiger Entitäten oft erschwert wird. Zur effizienteren Entwicklung von IE-Systemen wird in der Dissertation ein Verfahren untersucht, das alleine anhand von Beispielentitäten effektive Reguläre Ausdrücke zur Extraktion von unbekannten Entitäten erlernt und damit den manuellen Aufwand in derartigen Anwendungsfällen minimiert. Verschiedene Generalisierungs- und Spezialisierungsheuristiken erkennen Muster auf verschiedenen Abstraktionsebenen und schaffen dadurch einen Ausgleich zwischen Genauigkeit und Vollständigkeit bei der Extraktion. Bekannte Regellernverfahren im Bereich der Informationsextraktion unterstützen die beschriebenen Problemstellungen nicht, sondern benötigen einen (annotierten) Dokumentenkorpus. Eine Methode zur Identifikation von Entitäten, die durch Graph-strukturierte Referenzdaten vordefiniert sind, wird als dritter Schwerpunkt untersucht. Es werden Verfahren konzipiert, welche über einen exakten Zeichenkettenvergleich zwischen Text und Referenzdatensatz hinausgehen und Teilübereinstimmungen und Beziehungen zwischen Entitäten zur Identifikation und Disambiguierung heranziehen. Das in der Arbeit vorgestellte Verfahren ist bisherigen Ansätzen hinsichtlich der Genauigkeit und Vollständigkeit bei der Identifikation überlegen.
The programmable network envisioned in the 1990s within standardization and research for the Intelligent Network is currently coming into reality using IPbased Next Generation Networks (NGN) and applying Service-Oriented Architecture (SOA) principles for service creation, execution, and hosting. SOA is the foundation for both next-generation telecommunications and middleware architectures, which are rapidly converging on top of commodity transport services. Services such as triple/quadruple play, multimedia messaging, and presence are enabled by the emerging service-oriented IPMultimedia Subsystem (IMS), and allow telecommunications service providers to maintain, if not improve, their position in the marketplace. SOA becomes the de facto standard in next-generation middleware systems as the system model of choice to interconnect service consumers and providers within and between enterprises. We leverage previous research activities in overlay networking technologies along with recent advances in network abstraction, service exposure, and service creation to develop a paradigm for a service environment providing converged Internet and Telecommunications services that we call Service Broker. Such a Service Broker provides mechanisms to combine and mediate between different service paradigms from the two domains Internet/WWW and telecommunications. Furthermore, it enables the composition of services across these domains and is capable of defining and applying temporal constraints during creation and execution time. By adding network-awareness into the service fabric, such a Service Broker may also act as a next generation network-to-service element allowing the composition of crossdomain and cross-layer network and service resources. The contribution of this research is threefold: first, we analyze and classify principles and technologies from Information Technologies (IT) and telecommunications to identify and discuss issues allowing cross-domain composition in a converging service layer. Second, we discuss service composition methods allowing the creation of converged services on an abstract level; in particular, we present a formalized method for model-checking of such compositions. Finally, we propose a Service Broker architecture converging Internet and Telecom services. This environment enables cross-domain feature interaction in services through formalized obligation policies acting as constraints during service discovery, creation, and execution time.
The exponential expanding of the numbers of web sites and Internet users makes WWW the most important global information resource. From information publishing and electronic commerce to entertainment and social networking, the Web allows an inexpensive and efficient access to the services provided by individuals and institutions. The basic units for distributing these services are the web sites scattered throughout the world. However, the extreme fragility of web services and content, the high competence between similar services supplied by different sites, and the wide geographic distributions of the web users drive the urgent requirement from the web managers to track and understand the usage interest of their web customers. This thesis, "X-tracking the Usage Interest on Web Sites", aims to fulfill this requirement. "X" stands two meanings: one is that the usage interest differs from various web sites, and the other is that usage interest is depicted from multi aspects: internal and external, structural and conceptual, objective and subjective. "Tracking" shows that our concentration is on locating and measuring the differences and changes among usage patterns. This thesis presents the methodologies on discovering usage interest on three kinds of web sites: the public information portal site, e-learning site that provides kinds of streaming lectures and social site that supplies the public discussions on IT issues. On different sites, we concentrate on different issues related with mining usage interest. The educational information portal sites were the first implementation scenarios on discovering usage patterns and optimizing the organization of web services. In such cases, the usage patterns are modeled as frequent page sets, navigation paths, navigation structures or graphs. However, a necessary requirement is to rebuild the individual behaviors from usage history. We give a systematic study on how to rebuild individual behaviors. Besides, this thesis shows a new strategy on building content clusters based on pair browsing retrieved from usage logs. The difference between such clusters and the original web structure displays the distance between the destinations from usage side and the expectations from design side. Moreover, we study the problem on tracking the changes of usage patterns in their life cycles. The changes are described from internal side integrating conceptual and structure features, and from external side for the physical features; and described from local side measuring the difference between two time spans, and global side showing the change tendency along the life cycle. A platform, Web-Cares, is developed to discover the usage interest, to measure the difference between usage interest and site expectation and to track the changes of usage patterns. E-learning site provides the teaching materials such as slides, recorded lecture videos and exercise sheets. We focus on discovering the learning interest on streaming lectures, such as real medias, mp4 and flash clips. Compared to the information portal site, the usage on streaming lectures encapsulates the variables such as viewing time and actions during learning processes. The learning interest is discovered in the form of answering 6 questions, which covers finding the relations between pieces of lectures and the preference among different forms of lectures. We prefer on detecting the changes of learning interest on the same course from different semesters. The differences on the content and structure between two courses leverage the changes on the learning interest. We give an algorithm on measuring the difference on learning interest integrated with similarity comparison between courses. A search engine, TASK-Moniminer, is created to help the teacher query the learning interest on their streaming lectures on tele-TASK site. Social site acts as an online community attracting web users to discuss the common topics and share their interesting information. Compared to the public information portal site and e-learning web site, the rich interactions among users and web content bring the wider range of content quality, on the other hand, provide more possibilities to express and model usage interest. We propose a framework on finding and recommending high reputation articles in a social site. We observed that the reputation is classified into global and local categories; the quality of the articles having high reputation is related with the content features. Based on these observations, our framework is implemented firstly by finding the articles having global or local reputation, and secondly clustering articles based on their content relations, and then the articles are selected and recommended from each cluster based on their reputation ranks.
Companies develop process models to explicitly describe their business operations. In the same time, business operations, business processes, must adhere to various types of compliance requirements. Regulations, e.g., Sarbanes Oxley Act of 2002, internal policies, best practices are just a few sources of compliance requirements. In some cases, non-adherence to compliance requirements makes the organization subject to legal punishment. In other cases, non-adherence to compliance leads to loss of competitive advantage and thus loss of market share. Unlike the classical domain-independent behavioral correctness of business processes, compliance requirements are domain-specific. Moreover, compliance requirements change over time. New requirements might appear due to change in laws and adoption of new policies. Compliance requirements are offered or enforced by different entities that have different objectives behind these requirements. Finally, compliance requirements might affect different aspects of business processes, e.g., control flow and data flow. As a result, it is infeasible to hard-code compliance checks in tools. Rather, a repeatable process of modeling compliance rules and checking them against business processes automatically is needed. This thesis provides a formal approach to support process design-time compliance checking. Using visual patterns, it is possible to model compliance requirements concerning control flow, data flow and conditional flow rules. Each pattern is mapped into a temporal logic formula. The thesis addresses the problem of consistency checking among various compliance requirements, as they might stem from divergent sources. Also, the thesis contributes to automatically check compliance requirements against process models using model checking. We show that extra domain knowledge, other than expressed in compliance rules, is needed to reach correct decisions. In case of violations, we are able to provide a useful feedback to the user. The feedback is in the form of parts of the process model whose execution causes the violation. In some cases, our approach is capable of providing automated remedy of the violation.