004 Datenverarbeitung; Informatik
Refine
Has Fulltext
- yes (257)
Year of publication
Document Type
- Journal article (123)
- Doctoral Thesis (68)
- Working Paper (37)
- Preprint (19)
- Conference Proceeding (8)
- Report (2)
Language
- English (257) (remove)
Keywords
- virtual reality (16)
- Datennetz (14)
- Leistungsbewertung (13)
- Quran (8)
- Robotik (8)
- Koran (7)
- Text Mining (7)
- Mobiler Roboter (6)
- Autonomer Roboter (5)
- Komplexitätstheorie (5)
- Maschinelles Lernen (5)
- Netzwerk (5)
- Optimierung (5)
- P4 (5)
- Theoretische Informatik (5)
- Visualisierung (5)
- artificial intelligence (5)
- machine learning (5)
- Overlay-Netz (4)
- Routing (4)
- SDN (4)
- Verteiltes System (4)
- XML (4)
- augmented reality (4)
- deep learning (4)
- human-computer interaction (4)
- Algorithmus (3)
- Approximationsalgorithmus (3)
- Bayesian classifier (3)
- Computer Vision (3)
- Deep learning (3)
- Dienstgüte (3)
- Drahtloses Sensorsystem (3)
- Graph (3)
- Graphenzeichnen (3)
- IoT (3)
- Komplexität (3)
- Machine Learning (3)
- Mensch-Maschine-Schnittstelle (3)
- Netzwerkmanagement (3)
- Optimization (3)
- Peer-to-Peer-Netz (3)
- Performance Evaluation (3)
- QoE (3)
- Quadrocopter (3)
- Quality of Experience (3)
- Rechnernetz (3)
- Ressourcenmanagement (3)
- Robotics (3)
- Softwarearchitektur (3)
- Textvergleich (3)
- Visualization (3)
- Wissensmanagement (3)
- approximation algorithm (3)
- crowdsensing (3)
- database (3)
- graph drawing (3)
- immersion (3)
- mHealth (3)
- neural networks (3)
- resistance (3)
- simulation (3)
- 5G (2)
- Algorithmische Geometrie (2)
- Ausfallsicheres System (2)
- Ausfallsicherheit (2)
- Base text (2)
- Benutzerschnittstelle (2)
- CSS (2)
- Cascading Style Sheets (2)
- Content Management (2)
- Crowdsourcing (2)
- Data Mining (2)
- Dot-Depth Problem (2)
- Drahtloses lokales Netz (2)
- Effizienter Algorithmus (2)
- Entscheidbarkeit (2)
- Fernwartung (2)
- Future Internet (2)
- Gothenburg model (2)
- Human-Robot-Interaction (2)
- IEEE 802.11 (2)
- Internet of Things (2)
- Kleinsatellit (2)
- Knowledge Management (2)
- Kreuzung (2)
- Localization (2)
- Lokalisation (2)
- MP-DCCP (2)
- Maschinelles Sehen (2)
- Mensch-Maschine-System (2)
- Mensch-Roboter-Interaktion (2)
- Meta-model (2)
- Mixed Reality (2)
- Modellierung (2)
- NP-hardness (2)
- PROLOG <Programmiersprache> (2)
- Punktwolke (2)
- Quadrotor (2)
- Resilience (2)
- Resource Management (2)
- Simulation (2)
- Situation Awareness (2)
- Software Defined Networking (2)
- Software Engineering (2)
- Teleoperation (2)
- Text mining (2)
- Textual alterations weighting system (2)
- Textual document collation (2)
- Theoretical Computer Science (2)
- User Interface (2)
- Verbotsmuster (2)
- Wissensrepräsentation (2)
- Wrapper <Programmierung> (2)
- XR (2)
- automation (2)
- connected mobility applications (2)
- cosmology (2)
- crossing minimization (2)
- decidability (2)
- design (2)
- dot-depth problem (2)
- education (2)
- educational tool (2)
- endliche Automaten (2)
- endoscopy (2)
- engineering (2)
- evolution (2)
- exposure (2)
- finite automata (2)
- fog computing (2)
- forbidden patterns (2)
- framework (2)
- fully convolutional neural networks (2)
- games (2)
- gastroenterology (2)
- genetics (2)
- historical document analysis (2)
- immersive technologies (2)
- knowledge representation (2)
- measurements (2)
- metabolic modeling (2)
- mobile networks (2)
- multipath (2)
- multipath scheduling (2)
- natural variation (2)
- navigation (2)
- network calculus (2)
- networks (2)
- ontology (2)
- perception (2)
- prediction (2)
- regular languages (2)
- reguläre Sprachen (2)
- satellite communication (2)
- scalability (2)
- segmentation (2)
- self-aware computing (2)
- sensor (2)
- smart speaker (2)
- spatial presence (2)
- tinnitus (2)
- virtual agent (2)
- virtual environments (2)
- 26S RDNA Data (1)
- 3D Laser Scanning (1)
- 3D Pointcloud (1)
- 3D Punktwolke (1)
- 3D Reconstruction (1)
- 3D Sensor (1)
- 3D Vision (1)
- 3D collation (1)
- 3D fluoroscopy (1)
- 3D point cloud (1)
- 3D thermal mapping (1)
- 3D viewer (1)
- 3D-Rekonstruktion (1)
- 3D-reconstruction methods (1)
- 3DTK toolkit (1)
- 4D-GIS (1)
- 4G Networks (1)
- 5G core network (1)
- 5G-ATSSS (1)
- 5GC (1)
- 6DOF Pose Estimation (1)
- 6G (1)
- ACKR4 (1)
- AI (1)
- AKT (1)
- ATSSSS (1)
- AVA (1)
- Abhängigskeitsgraph (1)
- Accessibility (1)
- Add-on-Miss (1)
- Admission Control (1)
- Analysis (1)
- Anwendungsfall (1)
- Approximation (1)
- Arctic (1)
- Arterie (1)
- Artery (1)
- Automat <Automatentheorie> (1)
- Automata Theory (1)
- Automatentheorie (1)
- Autonomous Robot (1)
- Autonomous UAV (1)
- Autonomous multi-vehicle systems (1)
- Autorotation (1)
- BPM (1)
- BPMN (1)
- Backbone-Netz (1)
- Background Knowledge (1)
- Balloon (1)
- Banks Islands (1)
- Barcodes (1)
- Bayes-Klassifikator (1)
- Benutzererlebnis (1)
- Benutzerforschung (1)
- Benutzerinteraktion (1)
- Berechenbarkeit (1)
- Berechnungskomplexität (1)
- Betriebssystem (1)
- Bewegungskompensation (1)
- Bewegungskoordination (1)
- Bildverarbeitung (1)
- Biological Networks (1)
- Biology (1)
- BitTorrent (1)
- Bodenstation (1)
- Boolean Grammar (1)
- Boolean equivalence (1)
- Boolean function (1)
- Boolean functions (1)
- Boolean hierarchy (1)
- Boolean isomorphism (1)
- Boolean tree (1)
- Boolesche Funktionen (1)
- Boolesche Grammatik (1)
- Boolesche Hierarchie (1)
- CASE (1)
- CD4+T cells (1)
- CD8+T cells (1)
- CD95 (1)
- CETCH cycle (1)
- CHI Conference (1)
- CLIP (1)
- CO2-sequestration (1)
- COVID-19 (1)
- Caenorhabditis elegans (1)
- Call Graph (1)
- Causes of revelation (1)
- Chapters arrangement (1)
- Charged aerosol detector (CAD) (1)
- Chord (1)
- Chronology of revelation (1)
- Clones (1)
- Cloud Gaming (1)
- Clustering (1)
- Colonial volvocales chlorophyta (1)
- Communication Networks (1)
- Complex Systems (1)
- Complexity Theory (1)
- Compression (1)
- Computational Geometry (1)
- Computational complexity (1)
- Computer software (1)
- Computersimulation (1)
- Computerspiel (1)
- Computerunterstütztes Lernen (1)
- Containerization (1)
- Content Distribution (1)
- Crowdsensing (1)
- CubeSat (1)
- DHT (1)
- DNA (1)
- DNA storage (1)
- Daedalus-Projekt (1)
- Dasycladales chlorophyta (1)
- Datenkommunikationsnetz (1)
- Deep Georeferencing (1)
- Deep Learning (1)
- Dependency Graph (1)
- Design (1)
- Design and Development (1)
- Dezentrale Regelung (1)
- Dichotomy (1)
- Digital Elevation Model (1)
- Dijkstra’s algorithm (1)
- Diskrete Simulation (1)
- Distributed Space Systems (1)
- Domänenspezifische Sprache (1)
- Dot-Depth-Hierarchie (1)
- Drahtloses vermaschtes Netz (1)
- Dreidimensionale Rekonstruktion (1)
- Dreieck (1)
- Dynamic Memory Management (1)
- Dynamische Speicherverwaltung (1)
- E8 symmetry (1)
- EEG (1)
- EEG frequency band analysis (1)
- EEG preprocessing (1)
- EEG processing (1)
- EPM (1)
- Echtzeitsystem (1)
- Echzeit (1)
- Edge-MEC-Cloud (1)
- Edge-based Intelligence (1)
- Eingebettetes System (1)
- Elasticity tensor (1)
- Elastizitätstensor (1)
- Embedded Systems (1)
- Emotion inference (1)
- Emotionserkennung (1)
- Emotionsinterpretation (1)
- Endpoint Mobility (1)
- Energieeffizienz (1)
- Energy efficiency (1)
- Erfüllbarkeitsproblem (1)
- Erweiterte Realität (1)
- Euclidean plane (1)
- Euklidische Ebene (1)
- Expert System (1)
- Expertensystem (1)
- FIFO caching strategies (1)
- FLIMbee (1)
- Fairness (1)
- Fatty acids (1)
- Feature Based Registration (1)
- Fehlertoleranz (1)
- Fernsteuerung (1)
- Flugkörper (1)
- Forces (1)
- Formale Sprache (1)
- Formation (1)
- Formation Flight (1)
- Formationsbewegung (1)
- Formmessung (1)
- Fragmentation (1)
- Fragmentierung (1)
- Frames (1)
- Funkressourcenverwaltung (1)
- GNSS/INS integrated navigation (1)
- Gastroenterologische Endoskopie (1)
- Gefühl (1)
- Generalisierung <Kartografie> (1)
- Generation Problem (1)
- Generierungsproblem (1)
- Genetic Optimization (1)
- Genetische Optimierung (1)
- Georeferenzierung (1)
- Gothenburg Modell (1)
- Gothenburg model of collation process (1)
- Gradient boosted trees (GBT) (1)
- Graphentheorie (1)
- Ground Station Networks (1)
- H.264 SVC (1)
- H.264/SVC (1)
- HGPS (1)
- HHblits (1)
- HMD (Head-Mounted Display) (1)
- HSPA (1)
- HTML (1)
- HTTP adaptive video streaming (1)
- Halbordnungen (1)
- Hardware (1)
- Herzkatheter (1)
- Herzkathetereingriff (1)
- High-performance liquid chromatography (HPLC) (1)
- Hintergrundwissen (1)
- Historical Maps (1)
- Historische Karte (1)
- Historische Landkarten (1)
- Hittitology (1)
- Human-centered computing / Access (1)
- Human-centered computing / Human computer interaction (HCI) / Interaction paradigms / Mixed / augmented reality (1)
- Human-centered computing / Human computer interaction (HCI) / Interaction paradigms / Virtual reality (1)
- Human-centered computing / Human computer interaction (HCI) / Interactiondevices (1)
- Human-centered computing / Human computerinteraction (HCI) / Interaction techniques (1)
- Hurwitz theorem (1)
- I-tasser (1)
- ICEP (1)
- IEEE 802.11e (1)
- IEEE 802.15.4 (1)
- IGFBP2 (1)
- III secretion (1)
- INS/LIDAR integrated navigation (1)
- IP (1)
- IT security (1)
- Image Aesthetic Assessment (1)
- Image Registration (1)
- ImageJ (1)
- Implementierung <Informatik> (1)
- Industrial internet (1)
- Industrie 4.0 (1)
- Information Extraction (1)
- Information Visualization (1)
- Instrument Control Toolbox (1)
- Intelligent Virtual Agents (1)
- InteractionSuitcase (1)
- Interaktion (1)
- Internet (1)
- Internet Protokoll (1)
- IoT-driven processes (1)
- IronChip Evaluation Package (1)
- Isomorphie (1)
- Itinerare (1)
- Itineraries (1)
- JCAS (1)
- JSF (1)
- Jacobian matrix (1)
- Java 3D (1)
- Java <Programmiersprache> (1)
- Java Frameworks (1)
- Java Message Service (1)
- Kademlia (1)
- Kanalzugriff (1)
- Karte (1)
- Kathará (1)
- Kerneldensity estimation (1)
- Klassendiagramm (1)
- Klassifikation (1)
- Klima (1)
- Knowledge Discovery (1)
- Knowledge Management System (1)
- Knowledge Modeling (1)
- Knowledge representation (1)
- Knowledge-based System (1)
- Knowledge-based Systems Engineering (1)
- Kombinatorik (1)
- Kommunikation (1)
- Kommunikationsnetze (1)
- Komplexes System (1)
- Komplexitätsklasse (1)
- Komplexitätsklasse NP (1)
- Konvexe Zeichnungen (1)
- Kooperierende mobile Roboter (1)
- Kreuzungsminimierung (1)
- Kryoelektronenmikroskopie (1)
- Kurve (1)
- Künstliche Intelligenz (1)
- LC-MS/MS (1)
- LFU (1)
- LRU (1)
- Land Cover Classification (1)
- Land plants (1)
- Landkartenbeschriftung (1)
- Landnutzungskartierung (1)
- Laser scanning (1)
- Lava (1)
- Lawhul-Mahfuz (1)
- Lee Smolin (1)
- Lidar (1)
- Lifetime spectroscopy (1)
- Lightning (1)
- Link rate adaptation (1)
- Linkratenanpassung (1)
- Linux (1)
- LoRa (1)
- LoRaWAN (1)
- LoRaWan (1)
- Logic Programming (1)
- Logische Programmierung (1)
- Lunar Caves (1)
- Lunar Exploration (1)
- MAC (1)
- MDR (1)
- MTC (1)
- MVC <Software> (1)
- Mackenzie-River-Delta (1)
- Mapping (1)
- Mars (1)
- Mashup (1)
- Mashup <Internet> (1)
- Mathematische Modellierung (1)
- Mathematisches Modell (1)
- Measurement (1)
- Medical Image Analysis (1)
- Medium <Physik> (1)
- Medizin (1)
- Mehrfahrzeugsysteme (1)
- Mehrkriterielle Optimierung (1)
- Mehrpfadübertragung (1)
- Mehrschichtnetze (1)
- Mehrschichtsystem (1)
- Mensch-Maschine-Kommunikation (1)
- Mesh Networks (1)
- Mesh Netze (1)
- Metaverse (1)
- Methode (1)
- Microarray (1)
- Middleware (1)
- Miniaturisierung (1)
- Minimally invasive vascular intervention (1)
- Mobiles Internet (1)
- Mobilfunk (1)
- Modell (1)
- Modellierungstechniken (1)
- Modularität (1)
- Molecular systematics (1)
- Mond (1)
- Multi-Layer (1)
- Multi-Network Service (1)
- Multi-Netzwerk Dienste (1)
- Multi-Paradigm Programming (1)
- Multi-Paradigm Programming Framework (1)
- Multipath Transmission (1)
- Mustererkennung (1)
- Mycoplasma (1)
- Mycoplasma pneumoniae (1)
- NP (1)
- NP-Vollständigkeit (1)
- NP-complete sets (1)
- NP-hartes Problem (1)
- NP-schweres Problem (1)
- Naïve Bayesian (1)
- Network Emulator (1)
- Network Experiments (1)
- Network Management (1)
- Network Measurements (1)
- Network Virtualization (1)
- Networks (1)
- Netzplantechnik (1)
- Netzplanung (1)
- Netzvirtualisierung (1)
- Netzwerkplanung (1)
- Netzwerkvirtualisierung (1)
- Neuromuscular junctions (1)
- Neuronales Netz (1)
- Newton Methods (1)
- Newton-Verfahren (1)
- Next Generation Networks (1)
- Nichtholonome Fahrzeuge (1)
- Nichtlineare Regelung (1)
- Nuclear RDNA (1)
- Object Detection (1)
- Object-Oriented Programming (1)
- Objektorientierte Programmierung (1)
- Operator (1)
- Optical Flow (1)
- Optimale Kontrolle (1)
- Optimierungsproblem (1)
- Optimization on Lie Groups (1)
- Overlapping (1)
- Overlay (1)
- Overlay Netzwerke (1)
- Overlay networks (1)
- Overlays (1)
- P4-INT (1)
- Panorama Images (1)
- Partition <Mengenlehre> (1)
- Partitionen (1)
- Path Computation Element (1)
- Pattern Recognition (1)
- Peer-to-Peer (1)
- Performance Analysis (1)
- Performance Enhancing Proxies (1)
- Performance Management (1)
- Performance Modeling (1)
- Pfadberechnungselement (1)
- Picosatellite (1)
- Place of revelation (1)
- Planare Graphen (1)
- Planung (1)
- Poisson surface reconstruction (1)
- PolSAR (1)
- Polyeder (1)
- Polypektomie (1)
- Positron annihilation spectroscopy (1)
- Post's Classes (1)
- Postsche Klassen (1)
- Prediction (1)
- Processing Model (1)
- Processing model (1)
- Profile distances (1)
- Programmierbare logische Anordnung (1)
- Publish-Subscribe-System (1)
- QUIC (1)
- QoS (1)
- Quality of Experience (QoE) (1)
- Quality of Experience QoE (1)
- Quality of Service (1)
- Quality of Service (QoS) (1)
- Quality-of-Experience (1)
- Quality-of-Service (1)
- Quality-of-Service (QoS) (1)
- Quantitative structure-property relationship modeling (QSPR) (1)
- Quantor (1)
- RBCL Gene-sequences (1)
- RGB-D (1)
- RNA sequencing (1)
- RRM (1)
- Radarfernerkundung (1)
- Raumdaten (1)
- Real-Time Operating Systems (1)
- Real-time (1)
- Reconstruction of original text (1)
- Refactoring (1)
- Reference Architecture (1)
- Regelung (1)
- Registration (1)
- Registrierung (1)
- Registrierung <Bildverarbeitung> (1)
- Reguläre Sprache (1)
- Relief <Geografie> (1)
- Rendezvous (1)
- Reproducibility (1)
- Resource and Performance Management (1)
- Ressourcen Management (1)
- Ressourcenallokation (1)
- Rettungsroboter (1)
- SARS-CoV-2 (1)
- SBA (1)
- SDN/NVF (1)
- SMLM (1)
- SNP (1)
- Satellit (1)
- Scatter Plot (1)
- Scheduling (1)
- Search-and-Rescue (1)
- Secondary structure (1)
- Selbstkalibrierung (1)
- Self-calibration (1)
- Semantic Web (1)
- Semantics (1)
- Semantik (1)
- Sensing-aaS (1)
- Sensor (1)
- Septins (1)
- Service Mobility (1)
- Sichtbarkeit (1)
- Similarity Measure (1)
- Simulator (1)
- Situationsbewusstsein (1)
- Skype (1)
- Small Satellites (1)
- Smart User Interaction (1)
- Social Web (1)
- Software (1)
- Software Performance Engineering (1)
- Software Performance Modeling (1)
- Software architecture (1)
- Software design (1)
- Software product lines (1)
- Source Code Visualization (1)
- Soziale Software (1)
- Spherical Robot (1)
- Spring (1)
- Stages of Prophet Mohammad’s messengership (1)
- Standardisierung (1)
- Standortproblem (1)
- Statistical classifiers (1)
- Statistics (1)
- Statistische Mechanik (1)
- Statistische Physik (1)
- Sternfreie Sprache (1)
- Steuerung (1)
- Stiffness (1)
- Stochastic Algorithms (1)
- Stochastische Optimierung (1)
- Strahlentherapie (1)
- Straubing-Th´erien-Hierarchie (1)
- Structure-from-Motion (1)
- Strukturelle Komplexität (1)
- Struts (1)
- Subgroup Mining (1)
- Subgruppenentdeckung (1)
- Substruktur (1)
- Support Vector Machine (1)
- Synapses (1)
- Synaptic vesicles (1)
- Synthetic Aperture Radar (1)
- TSN (1)
- TTL (1)
- TTL validation of data consistency (1)
- Telematik (1)
- Terramechanics (1)
- Testbed (1)
- Text categorization (1)
- Text segmentation (1)
- Theoretical computer science (1)
- Thermografie (1)
- Time resolved measurements (1)
- Tomografie (1)
- Topografie (1)
- Torque (1)
- Trainingssystem (1)
- Travelling-salesman-Problem (1)
- Tumor motion (1)
- Tumorbewegung (1)
- U-Bahnlinienplan (1)
- UI and Interaction Design (1)
- UML Klassendiagramm (1)
- UML class diagram (1)
- UMTS (1)
- URL (1)
- URLLC (1)
- Underwater Mapping (1)
- Underwater Scanning (1)
- Unmanned Aerial Vehicle (1)
- Unstetige Regelung (1)
- Usability (1)
- Use case (1)
- User Behavior (1)
- User Participation (1)
- V-antigen (1)
- VNF (1)
- VPN (1)
- Variability (1)
- Venus (1)
- Veranstaltung (1)
- Verbotenes Muster (1)
- Verbände (1)
- Verkehrslenkung (1)
- Verteilung von Inhalten (1)
- Vesicles (1)
- Video Quality Monitoring (1)
- Video Streaming (1)
- Videoübertragung (1)
- Virtualisierung (1)
- Virtuelles Netzwerk (1)
- Visibility (1)
- Visual Text Mining (1)
- Visual Tracking (1)
- Visualized Kathará (1)
- Voice-over-IP (VoIP) (1)
- Vorhersage (1)
- WH2 domain (1)
- WLAN (1)
- WNT (1)
- Warteschlangentheorie (1)
- Web service (1)
- WebGL (1)
- Webservice Composition (1)
- WhatsApp (1)
- Wheel (1)
- Winkel (1)
- Wire relaxation (1)
- Wireless LAN (1)
- Wireless Sensor/Actuator Systems (1)
- Wissensbanksystem (1)
- Wissensbasiertes System (1)
- Wissenschaftliche Beobachtung (1)
- Wissensendeckung (1)
- Worterweiterungen (1)
- Wrapper (1)
- Wrappers (1)
- XML model (1)
- XR-artificial intelligence combination (1)
- XR-artificial intelligence continuum (1)
- Yersinia enterocolitica (1)
- Yolk protein (1)
- YouTube (1)
- Zebrafish (1)
- Zeichnen von Graphen (1)
- Zeitdiskretes System (1)
- Zugangskontrolle (1)
- Zählprobleme (1)
- abgeschlossene Klassen (1)
- acrophobia (1)
- actin nucleation (1)
- adaptation (1)
- adaptation models (1)
- administrative boundary (1)
- admission control (1)
- adult learning (1)
- advertising effectiveness (1)
- aerodynamics (1)
- aerospace (1)
- agent-based models (1)
- agents (1)
- agile Prozesse (1)
- agile processes (1)
- aging (1)
- alignment (1)
- anamnesis tool (1)
- aneurysm (1)
- angular schematization (1)
- annotation (1)
- anomaly detection (1)
- anomaly prediction (1)
- ant-colony optimization (1)
- anthropomorphism (1)
- anxiety (1)
- apixaban (1)
- application design (1)
- approximation algorithms (1)
- arabidopsis thaliana (1)
- arabidpsis thaliana (1)
- architectural design (1)
- arithmetic calculations (1)
- artificial intelligence education (1)
- artificial intelligence literacy (1)
- augmentation (1)
- automatic Layout (1)
- automatisches Layout (1)
- autonomic orchestration (1)
- autonomous (1)
- autonomous UAV (1)
- autorotation (1)
- availability (1)
- avatar embodiment (1)
- avatars (1)
- background knowledge (1)
- baseline detection (1)
- behavior (1)
- behavior change (1)
- behavior perception (1)
- bibliometric analysis (1)
- binary decision diagram (1)
- binary tanglegram (1)
- biofuel (1)
- biohybrid systems (1)
- bioinformatics (1)
- biological development (1)
- biomanufacturing (1)
- biosignals (1)
- bit (1)
- boundary labeling (1)
- brain (1)
- building (1)
- caenorhabditis elegans (1)
- camera orientation (1)
- car-like robots (1)
- carbon (1)
- carboxylation (1)
- cardiac magnetic resonance (1)
- caspase-3 (1)
- cell membranes (1)
- cerebral ischemia (1)
- certifying algorithm (1)
- chain cover (1)
- channel management (1)
- cisplatin (1)
- classification (1)
- climate (1)
- cloud-native (1)
- co-authorships (1)
- co-inventorships (1)
- cognitive impairment (1)
- coherence (1)
- collaboration (1)
- collision (1)
- colony-stimulating factor (1)
- combination therapy (1)
- communication models (1)
- communication networks (1)
- community detection (1)
- comparative sequence analysis (1)
- competitive location (1)
- complex traits (1)
- complexity (1)
- compressed sensing (1)
- computational (1)
- computational complexity (1)
- computer performance evaluation (1)
- computergestützte Softwaretechnik (1)
- computers as social actors (1)
- condition prediction (1)
- congruence (1)
- connector (1)
- constrained forest (1)
- contact representation (1)
- container virtualization (1)
- content-based image retrieval (1)
- continuous-time SLAM (1)
- conversational agent (1)
- conversational agents (1)
- convex bipartite graph (1)
- corticotropin-releasing hormone (1)
- cost-sensitive learning (1)
- counting problems (1)
- crosstalk (1)
- crowdsourced QoE measurements (1)
- crowdsourced measurements (1)
- crowdsourced network measurements (1)
- cryo-EM (1)
- cryo-ET (1)
- crystal growth (1)
- crystallization (1)
- cultural and media studies (1)
- culturally aware (1)
- cuneiform (1)
- curves (1)
- cyber-physical systems (1)
- cybersickness (1)
- cytokine profiling (1)
- d3web.Train (1)
- dSTORM (1)
- data plane programming (1)
- data stream processing (1)
- data structure (1)
- data warehouse (1)
- dataplane programming (1)
- decision support system (1)
- decision-making (1)
- decoding error rate (1)
- deep metric learning (1)
- definite clause grammars (1)
- deformation-based method (1)
- delay QoS exponent (1)
- delay bound violation probability (1)
- delay constrained (1)
- dementia (1)
- descent (1)
- design cycle (1)
- detection time simulation (1)
- diagnostic accuracy (1)
- dial a ride (1)
- differentiation (1)
- digital twin (1)
- dimensions of proximity (1)
- direct oral anticoagulants (1)
- direct thrombin inhibitor (1)
- discrete-time analysis (1)
- disease (1)
- disjoint multi-paths (1)
- disruption project (1)
- distance-based classifier (1)
- distributed control (1)
- docker (1)
- drug (1)
- drug-minded protein (1)
- dynamic flow migration (1)
- dynamic programming (1)
- eHealth (1)
- eco-metabolomics (1)
- ecological momentary assessment (1)
- edge labeled graphs (1)
- effective Bandwidth (1)
- efficient algorithm (1)
- electroencephalography (1)
- electrolytes (1)
- electronic health records (1)
- elementary mode analysis (1)
- elementary modes (1)
- elevated plus-maze (1)
- embedding techniques (1)
- emergent time (1)
- emotions (1)
- empathy (1)
- emulation (1)
- encryption (1)
- endurance (1)
- energy efficiency (1)
- environmental sound (1)
- enzyme (1)
- event detection (1)
- event-related potentials-ERP (1)
- exercise intensity (1)
- experience (1)
- experimental evaluation (1)
- expertise framing (Min5-Max 8) (1)
- expression (1)
- expression signature (1)
- extended reality (1)
- extended reality (XR) (1)
- factor XA inhibitor (1)
- failure prediction (1)
- fast reroute (1)
- fault detection (1)
- feature matching (1)
- federated learning (1)
- few-shot learning (1)
- fixed-parameter tractability (1)
- flies (1)
- fluoroscopy (1)
- food quality (1)
- force dynamics (1)
- foreign language learning and teaching (1)
- formation driving (1)
- formation flight (1)
- fruit temperature (1)
- functional analysis (1)
- future Internet architecture (1)
- future energy grid exploration (1)
- game mechanics (1)
- gamification (1)
- gamma (1)
- generative systems (1)
- genes (1)
- genetic algorithm (1)
- genetic regulatory network (1)
- geospatial data (1)
- global IPX network (1)
- graph (1)
- graph algorithm (1)
- graph decomposition (1)
- graphs (1)
- green systems biology (1)
- group-based communication (1)
- handwriting (1)
- haptic data (1)
- hardness (1)
- hardware-in-the-loop simulation (1)
- hardware-in-the-loop streaming system (1)
- hepatotoxicity (1)
- heuristics (1)
- hierarchy (1)
- histidine kinase (1)
- historical images (1)
- hit ratio analysis and simulation (1)
- homology modeling (1)
- hospital data (1)
- human body weight (1)
- human computer interaction (HCI) (1)
- human-artificial intelligence interaction (1)
- human-artificial intelligence interface (1)
- human-centered design (1)
- human-centered, human-robot (1)
- humantechnology interaction (1)
- human–computer interaction (1)
- hybrid access (1)
- hypotonic (1)
- hypotonic solutions (1)
- illusion of self-motion (1)
- image classification (1)
- image processing (1)
- image schemas (1)
- imbalanced regression (1)
- immersive advertising (1)
- immersive classroom (1)
- immersive classroom management (1)
- immersive learning technologies (1)
- immunity (1)
- implicit association test (1)
- in situ analysis (1)
- independent crossing (1)
- induced matching (1)
- inflation (1)
- informal education (1)
- information extraction (1)
- information systems and information technology (1)
- inhibitor (1)
- intelligent transportation systems (1)
- intelligent vehicles (1)
- intelligent virtual agents (1)
- intelligent voice assistant (1)
- intelligente Applikationen (1)
- intention-behavior-gap (1)
- inter-coder reliability (1)
- interaction (1)
- interactive authoring system (1)
- interactive collation of textual variants (1)
- intercultural learning and teaching (1)
- interdisciplinary education (1)
- intermediate host (1)
- internal transcribed spacer 2 (1)
- internet protocol (1)
- internet traffic (1)
- interpolation (1)
- intervention design (1)
- intervention evaluation (1)
- intraoperative imaging (1)
- invasive vascular interventions (1)
- iowa gambling task (1)
- isotonic (1)
- key-insight extraction (1)
- kinect (1)
- labeling (1)
- land-cover area (1)
- landing (1)
- language-image pre-training (1)
- latency (1)
- lattices (1)
- layout recognition (1)
- learning environments (1)
- least cost (1)
- life-span regulation (1)
- lifetime spectroscopy (1)
- light-gated proteins (1)
- load balancing (1)
- local energy system (1)
- locomotion (1)
- logic programming (1)
- logistics (1)
- long-term analysis (1)
- lymphotoxicity (1)
- malaria (1)
- map projections (1)
- mapping (1)
- markers (1)
- mathematical model (1)
- measurement (1)
- media analysis (1)
- media equation (1)
- medical analytics (1)
- medical device regulation (1)
- medical device software (1)
- medical records (1)
- medieval manuscripts (1)
- meditation (1)
- membrane protein (1)
- membrane proteins (1)
- memory immune responses (1)
- metabolic flux (1)
- metabolism (1)
- metabolomics (1)
- metastasis (1)
- methylene blue (1)
- metro map (1)
- mice (1)
- microbes (1)
- mindfulness (1)
- misconceptions (1)
- mixed reality (1)
- mixed-cultural (1)
- mixed-cultural settings (1)
- mobile application (1)
- mobile instant messaging (1)
- mobile messaging application (1)
- mobile robots (1)
- mobile streaming (1)
- model following (1)
- model output statistics (1)
- model predictive control (1)
- model-based diagnosis (1)
- modeling techniques (1)
- modules (1)
- molecular systematics (1)
- monotone drawing (1)
- morphing (1)
- mouse (1)
- multi-vehicle formations (1)
- multi-vehicle rendezvous (1)
- multimodal fusion (1)
- multimodal interface (1)
- multimodal learning (1)
- multipath communication (1)
- multipath packet scheduling (1)
- multiple myeloma (1)
- multirotors (1)
- multiscale encoder (1)
- mutation (1)
- mycoplasma (1)
- nano-satellite (1)
- nanocellulose (1)
- natural interfaces (1)
- natural language processing (1)
- natural language processing · · · (1)
- natural user interfaces (1)
- network (1)
- network design (1)
- network planning (1)
- network softwarization (1)
- network upgrade (1)
- network virtualization (1)
- networked robotics (1)
- networking (1)
- neume notation (1)
- neural architecture (1)
- noise measurement (1)
- non-native accent (1)
- non-terrestrial networks (1)
- nonholonomic vehicles (1)
- nonhuman-primates (1)
- nonverbal behavior (1)
- object detection (1)
- octree (1)
- omics (1)
- optical music recognition (1)
- optimization (1)
- orchestration (1)
- organogenesis (1)
- origin (1)
- overprovisioning (1)
- oxidative stress (1)
- packet reception method (1)
- painful (1)
- pangolin (1)
- particle picking (1)
- partitions (1)
- passage of time (1)
- passive haptic feedback (1)
- path computation (1)
- pathway (1)
- performance (1)
- performance analysis (1)
- performance evaluation (1)
- performance liquid chromatography (1)
- performance monitoring (1)
- performance prediction (1)
- permeability (1)
- pestis infection (1)
- phase space (1)
- phase transition (1)
- photorespiration (1)
- phylogenetic tree (1)
- phylogeny (1)
- place-illusion (1)
- plain orchestrating service (1)
- plausibility (1)
- plausibility-illusion (1)
- pneumoniae (1)
- pneumonic plague (1)
- point cloud (1)
- point cloud compression (1)
- point-to-plane measure (1)
- point-to-point measure (1)
- pollution (1)
- pos (1)
- posets (1)
- positioning (1)
- precision horticulture (1)
- precision training (1)
- presence (1)
- private chat groups (1)
- procedural content generation (1)
- procedural fusion methods (1)
- processing pipeline (1)
- progeria (1)
- promoter (1)
- prompt engineering (1)
- protein (1)
- protein chip (1)
- protein-interaction networks (1)
- pseudomas-syringae (1)
- psychomotor training (1)
- psychophyisology (1)
- public speaking (1)
- pulse simulation (1)
- quadcopter (1)
- quadcopters (1)
- quality assurance (1)
- quality evaluation (1)
- quality of experience (1)
- quality of experience prediction (1)
- quantification (1)
- qubit (1)
- radio resource management (1)
- radiology (1)
- ransomware (1)
- real world evidence (1)
- real-world application (1)
- realism (1)
- receding horizon control (1)
- receptor (1)
- recombinant protein rVE (1)
- recombination (1)
- recommender system (1)
- reconfiguration (1)
- reload cost (1)
- remote control (1)
- research methods (1)
- resilience (1)
- response regulator (1)
- ribosomal RNA (1)
- rich vehicle routing problem (1)
- richtersius coronifer (1)
- right angle crossing (1)
- robotics (1)
- robustness (1)
- rotorcraft (1)
- rotors (1)
- routing (1)
- sample weighting (1)
- satisfiability problems (1)
- scalability evaluation (1)
- scalable quadcopter (1)
- scheduling (1)
- science, technology and society (1)
- secondary structure (1)
- secure group communication (1)
- self-adaptive (1)
- self-adaptive systems (1)
- self-assembly (1)
- self-aware computing systems (1)
- self-managing systems (1)
- semantic fusion (1)
- semantic understanding (1)
- semantic web (1)
- semantical aesthetic (1)
- semantische Ästhetik (1)
- sensitivity analysis (1)
- sensor devices (1)
- sensor fusion (1)
- sensor networks (1)
- sentinel (1)
- sequence alignment (1)
- serious games (1)
- serum (1)
- service based software architecture (1)
- service brokerage (1)
- service-curve estimation (1)
- sesnsors (1)
- set (1)
- shootin-1 (1)
- short block-length (1)
- shortest path routing (1)
- signal processing (1)
- signaling traffic (1)
- simulation system (1)
- simultaneous embedding (1)
- single-electron transistors (1)
- sketching (1)
- smart meter data utilization (1)
- smooth orthogonal drawing (1)
- snow shoveling (1)
- social VR (1)
- social interaction (1)
- social relationship (1)
- social robot (1)
- social robotics (1)
- social role (1)
- socially interactive agents (1)
- software defined network (1)
- spanning tree (1)
- spire (1)
- stability (1)
- stable state (1)
- standardization (1)
- state management (1)
- statistical validity (1)
- statistics and numerical data (1)
- stereotypes (1)
- stream processing (1)
- stroke (1)
- structural complexity (1)
- student simulation (1)
- stylus (1)
- sun exposure (1)
- sunburn (1)
- superoxide-dismutase (1)
- supervised learning (1)
- surface model (1)
- survey (1)
- survival (1)
- sustainability (1)
- switching navigation (1)
- synthetic biology (1)
- synthetic pathways (1)
- system architecture design (1)
- systematic literature review (1)
- systematic review (1)
- table extraction (1)
- table understanding (1)
- taxonomy (1)
- teacher education (1)
- technology-supported learning (1)
- telematics (1)
- temperature (1)
- text categorization (1)
- text line detection (1)
- text supervision (1)
- theory (1)
- therapeutic application (1)
- thermal camera (1)
- thermal point cloud (1)
- time calibration (1)
- time perception (1)
- time series (1)
- timestamping method (1)
- tolerance (1)
- tomography (1)
- tonicity (1)
- tools (1)
- topology (1)
- training systems (1)
- trait anxiety (1)
- trajectory planning (1)
- transcription (1)
- transformations (1)
- transformer (1)
- translational neuroscience (1)
- transmission (1)
- transport microenvironments (1)
- transport protocols (1)
- transportation (1)
- tree (1)
- trust (1)
- trustworthiness (1)
- unmanned aerial vehicle (1)
- unmanned aerial vehicles (1)
- usability evaluation (1)
- use cases (1)
- user experience (1)
- user interaction (1)
- user interfaces (1)
- user study (1)
- user-generated content (1)
- v (1)
- vaccine (1)
- validation (1)
- vection (1)
- vehicle dynamics (1)
- vehicular navigation (1)
- verbal behaviour (1)
- vernetzte Roboter (1)
- virtual agent interaction (1)
- virtual audience (1)
- virtual humans (1)
- virtual queue (1)
- virtual reality training (1)
- virtual stimuli (1)
- virtual tunnel (1)
- virtual-reality-continuum (1)
- visual analytics (1)
- visual proteomics (1)
- vitellogenin (1)
- voice assistant (1)
- voice-based artificial intelligence (1)
- vom Nutzer erfahrene Dienstgüte QoE (1)
- voting location (1)
- water stress (1)
- waypoint parameter (1)
- wearable (1)
- wheel (1)
- word clouds (1)
- word extensions (1)
- zooming (1)
- zukünftige Kommunikationsnetze (1)
- zukünftiges Internet (1)
- Ähnlichkeitsmaß (1)
- Überlappung (1)
Institute
- Institut für Informatik (183)
- Theodor-Boveri-Institut für Biowissenschaften (29)
- Institut Mensch - Computer - Medien (17)
- Institut für deutsche Philologie (17)
- Institut für Klinische Epidemiologie und Biometrie (7)
- Center for Computational and Theoretical Biology (4)
- Graduate School of Science and Technology (3)
- Medizinische Klinik und Poliklinik II (3)
- Institut für Funktionsmaterialien und Biofabrikation (2)
- Institut für Geographie und Geologie (2)
Schriftenreihe
Sonstige beteiligte Institutionen
- Cologne Game Lab (2)
- Birmingham City University (1)
- DATE Lab, KITE Research Insititute, University Health Network, Toronto, Canada (1)
- EMBL Heidelberg (1)
- INAF Padova, Italy (1)
- Jacobs University Bremen, Germany (1)
- Open University of the Netherlands (1)
- Servicezentrum Medizin-Informatik (Universitätsklinikum) (1)
- Social and Technological Systems (SaTS) lab, School of Art, Media, Performance and Design, York University, Toronto, Canada (1)
- TH Köln (1)
In the course of the growth of the Internet and due to increasing availability of data, over the last two decades, the field of network science has established itself as an own area of research. With quantitative scientists from computer science, mathematics, and physics working on datasets from biology, economics, sociology, political sciences, and many others, network science serves as a paradigm for interdisciplinary research.
One of the major goals in network science is to unravel the relationship between topological graph structure and a network’s function. As evidence suggests, systems from the same fields, i.e. with similar function, tend to exhibit similar structure. However, it is still vague whether a similar graph structure automatically implies likewise function. This dissertation aims at helping to bridge this gap, while particularly focusing on the role of triadic structures.
After a general introduction to the main concepts of network science, existing work devoted to the relevance of triadic substructures is reviewed. A major challenge in modeling triadic structure is the fact that not all three-node subgraphs can be specified independently
of each other, as pairs of nodes may participate in multiple of those triadic subgraphs.
In order to overcome this obstacle, we suggest a novel class of generative network models based on so called Steiner triple systems. The latter are partitions of a graph’s vertices into pair-disjoint triples (Steiner triples). Thus, the configurations on Steiner triples can be specified independently of each other without overdetermining the network’s link
structure.
Subsequently, we investigate the most basic realization of this new class of models. We call it the triadic random graph model (TRGM). The TRGM is parametrized by a probability distribution over all possible triadic subgraph patterns. In order to generate a network instantiation of the model, for all Steiner triples in the system, a pattern is drawn from the distribution and adjusted randomly on the Steiner triple. We calculate the degree distribution of the TRGM analytically and find it to be similar to a Poissonian distribution. Furthermore, it is shown that TRGMs possess non-trivial triadic structure. We discover inevitable correlations in the abundance of certain triadic subgraph
patterns which should be taken into account when attributing functional relevance to particular motifs – patterns which occur significantly more frequently than expected at random. Beyond, the strong impact of the probability distributions on the Steiner triples on the occurrence of triadic subgraphs over the whole network is demonstrated. This interdependence allows us to design ensembles of networks with predefined triadic substructure. Hence, TRGMs help to overcome the lack of generative models needed for assessing the relevance of triadic structure.
We further investigate whether motifs occur homogeneously or heterogeneously distributed over a graph. Therefore, we study triadic subgraph structures in each node’s neighborhood individually. In order to quantitatively measure structure from an individual node’s perspective, we introduce an algorithm for node-specific pattern mining for both directed unsigned, and undirected signed networks. Analyzing real-world datasets, we find that there are networks in which motifs are distributed highly heterogeneously, bound to the proximity of only very few nodes. Moreover, we observe indication for the potential sensitivity of biological systems to a targeted removal of these critical vertices. In addition, we study whole graphs with respect to the homogeneity and homophily of their node-specific triadic structure. The former describes the similarity of subgraph distributions in the neighborhoods of individual vertices. The latter quantifies whether connected vertices
are structurally more similar than non-connected ones. We discover these features to be characteristic for the networks’ origins. Moreover, clustering the vertices of graphs regarding their triadic structure, we investigate structural groups in the neural network of C. elegans, the international airport-connection network, and the global network of diplomatic sentiments between countries. For the latter we find evidence for the instability of triangles considered socially unbalanced according to sociological theories.
Finally, we utilize our TRGM to explore ensembles of networks with similar triadic substructure in terms of the evolution of dynamical processes acting on their nodes. Focusing on oscillators, coupled along the graphs’ edges, we observe that certain triad motifs impose a clear signature on the systems’ dynamics, even when embedded in a larger
network structure.
This paper presents a novel concept to extend state-of-the-art buffer monitoring with additional measures to estimate service-curves. The online algorithm for service-curve estimation replaces the state-of-the-art timestamp logging, as we expect it to overcome the main disadvantages of generating a huge amount of data and using a lot of CPU resources to store the data to a file during operation. We prove the accuracy of the online-algorithm offline with timestamp data and compare the derived bounds to the measured delay and backlog. We also do a proof-of- concept of the online-algorithm, implement it in LabVIEW and compare its performance to the timestamp logging by CPU load and data-size of the log-file. However, the implementation is still work-in-progress.
Operators of Higher Order
(1998)
Motivated by results on interactive proof systems we investigate the computational power of quantifiers applied to well-known complexity classes.
In special, we are interested in existential, universal and probabilistic bounded error quantifiers ranging over words and sets of words, i.e. oracles if we think in a Turing machine model.
In addition to the standard oracle access mechanism, we also consider quantifiers ranging over oracles to which access is restricted in a certain way.
At the center of the Internet’s protocol stack stands the Internet Protocol (IP) as a common denominator that enables all communication. To make routing efficient, resilient, and scalable, several aspects must be considered. Care must be taken that traffic is well balanced to make efficient use of the existing network resources, both in failure free operation and in failure scenarios.
Finding the optimal routing in a network is an NP-complete problem. Therefore, routing optimization is usually performed using heuristics. This dissertation shows that a routing optimized with one objective function is often not good when looking at other objective functions. It can even be worse than unoptimized routing with respect to that objective function. After looking at failure-free routing and traffic distribution in different failure scenarios, the analysis is extended to include the loop-free alternate (LFA) IP fast reroute mechanism. Different application scenarios of LFAs are examined and a special focus is set on the fact that LFAs usually cannot protect all traffic in a network even against single link failures. Thus, the routing optimization for LFAs is targeted on both link utilization and failure coverage. Finally, the pre-congestion notification mechanism PCN for network admission control and overload protection is analyzed and optimized. Different design options for implementing the protocol are compared, before algorithms are developed for the calculation and optimization of protocol parameters and PCN-based routing.
The second part of the thesis tackles a routing problem that can only be resolved on a global scale. The scalability of the Internet is at risk since a major and intensifying growth of the interdomain routing tables has been observed. Several protocols and architectures are analyzed that can be used to make interdomain routing more scalable. The most promising approach is the locator/identifier (Loc/ID) split architecture which separates routing from host identification. This way, changes in connectivity, mobility of end hosts, or traffic-engineering activities are hidden from the routing in the core of the Internet and the routing tables can be kept much smaller. All of the currently proposed Loc/ID split approaches have their downsides. In particular, the fact that most architectures use the ID for routing outside the Internet’s core is a poor design, which inhibits many of the possible features of a new routing architecture. To better understand the problems and to provide a solution for a scalable routing design that implements a true Loc/ID split, the new GLI-Split protocol is developed in this thesis, which provides separation of global and local routing and uses an ID that is independent from any routing decisions.
Besides GLI-Split, several other new routing architectures implementing Loc/ID split have been proposed for the Internet. Most of them assume that a mapping system is queried for EID-to-RLOC mappings by an intermediate node at the border of an edge network. When the mapping system is queried by an intermediate node, packets are already on their way towards their destination, and therefore, the mapping system must be fast, scalable, secure, resilient, and should be able to relay packets without locators to nodes that can forward them to the correct destination. The dissertation develops a classification for all proposed mapping system architectures and shows their similarities and differences. Finally, the fast two-level mapping system FIRMS is developed. It includes security and resilience features as well as a relay service for initial packets of a flow when intermediate nodes encounter a cache miss for the EID-to-RLOC mapping.
Mobile 3D fluoroscopes have become increasingly available in neurosurgical operating rooms. We recently reported its use for imaging cerebral vascular malformations and aneurysms. This study was conducted to evaluate various radiation settings for the imaging of cerebral aneurysms before and after surgical occlusion. Eighteen patients with cerebral aneurysms with the indication for surgical clipping were included in this prospective analysis. Before surgery the patients were randomized into one of three different scan protocols according (default settings of the 3D fluoroscope): Group 1: 110 kV, 80 mA (enhanced cranial mode), group 2: 120 kV, 64 mA (lumbar spine mode), group 3: 120 kV, 25 mA (head/neck settings). Prior to surgery, a rotational fluoroscopy scan (duration 24 s) was performed without contrast agent followed by another scan with 50 ml of intravenous iodine contrast agent. The image files of both scans were transferred to an Apple PowerMac(R) workstation, subtracted and reconstructed using OsiriX(R) MD 10.0 software. The procedure was repeated after clip placement. The image quality regarding preoperative aneurysm configuration and postoperative assessment of aneurysm occlusion and vessel patency was analyzed by 2 independent reviewers using a 6-grade scale. This technique quickly supplies images of adequate quality to depict intracranial aneurysms and distal vessel patency after aneurysm clipping. Regarding these features, a further optimization to our previous protocol seems possible lowering the voltage and increasing tube current. For quick intraoperative assessment, image subtraction seems not necessary. Thus, a native scan without a contrast agent is not necessary. Further optimization may be possible using a different contrast injection protocol.
Natural walking in virtual reality games is constrained by the physical boundaries defined by the size of the player’s tracking space. Impossible spaces, a redirected walking technique, enlarge the virtual environment by creating overlapping architecture and letting multiple locations occupy the same physical space. Within certain thresholds, this is subtle to the player. In this paper, we present our approach to implement such impossible spaces and describe how we handled challenges like objects with simulated physics or precomputed global illumination.
The strict restrictions introduced by the COVID-19 lockdowns, which started from March 2020, changed people’s daily lives and habits on many different levels. In this work, we investigate the impact of the lockdown on the communication behavior in the mobile instant messaging application WhatsApp. Our evaluations are based on a large dataset of 2577 private chat histories with 25,378,093 messages from 51,973 users. The analysis of the one-to-one and group conversations confirms that the lockdown severely altered the communication in WhatsApp chats compared to pre-pandemic time ranges. In particular, we observe short-term effects, which caused an increased message frequency in the first lockdown months and a shifted communication activity during the day in March and April 2020. Moreover, we also see long-term effects of the ongoing pandemic situation until February 2021, which indicate a change of communication behavior towards more regular messaging, as well as a persisting change in activity during the day. The results of our work show that even anonymized chat histories can tell us a lot about people’s behavior and especially behavioral changes during the COVID-19 pandemic and thus are of great relevance for behavioral researchers. Furthermore, looking at the pandemic from an Internet provider perspective, these insights can be used during the next pandemic, or if the current COVID-19 situation worsens, to adapt communication networks to the changed usage behavior early on and thus avoid network congestion.
The issue of sustainability is at the top of the political and societal agenda, being considered of extreme importance and urgency. Human individual action impacts the environment both locally (e.g., local air/water quality, noise disturbance) and globally (e.g., climate change, resource use). Urban environments represent a crucial example, with an increasing realization that the most effective way of producing a change is involving the citizens themselves in monitoring campaigns (a citizen science bottom-up approach). This is possible by developing novel technologies and IT infrastructures enabling large citizen participation. Here, in the wider framework of one of the first such projects, we show results from an international competition where citizens were involved in mobile air pollution monitoring using low cost sensing devices, combined with a web-based game to monitor perceived levels of pollution. Measures of shift in perceptions over the course of the campaign are provided, together with insights into participatory patterns emerging from this study. Interesting effects related to inertia and to direct involvement in measurement activities rather than indirect information exposure are also highlighted, indicating that direct involvement can enhance learning and environmental awareness. In the future, this could result in better adoption of policies towards decreasing pollution.
In this work, we describe the network from data collection to data processing and storage as a system based on different layers. We outline the different layers and highlight major tasks and dependencies with regard to energy consumption and energy efficiency. With this view, we can outwork challenges and questions a future system architect must answer to provide a more sustainable, green, resource friendly, and energy efficient application or system. Therefore, all system layers must be considered individually but also altogether for future IoT solutions. This requires, in particular, novel sustainability metrics in addition to current Quality of Service and Quality of Experience metrics to provide a high power, user satisfying, and sustainable network.
Web caches often use a Time-to-live (TTL) limit to validate data consistency with web servers. We study the impact of TTL constraints on the hit ratio of basic strategies in caches of fixed size. We derive analytical results and confirm their accuracy in comparison to simulations. We propose a score-based caching method with awareness of the current TTL per data for improving the hit ratio close to the upper bound.