Browsing by Author "Vithiyasahar, V"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    PublicationOpen Access
    Decentralized Database Management: A Comprehensive Review of Blockchain- Based Data Systems
    (SLIIT City UNI, 2025-07-08) Sukirthan, T; Arunpirakash, S; Karuneswaran, G; Tharmmendra, T; Vithiyasahar, V
    The emergence of blockchain technology has revolutionized decentralized data management by offering robust alternatives to traditional centralized database systems. This paper provides a systematic and comprehensive review of blockchain-based distributed databases, highlighting key architectural transformations, core enabling technologies such as Merkle Trees, PBFT, and Zero-Knowledge Proofs, and comparing them with conventional distributed databases. Real-world implementations including Hyperledger Fabric, BigchainDB, and OrbitDB are analyzed to assess their scalability, interoperability, and security capabilities. The paper also explores intrinsic security mechanisms, performance bottlenecks, and regulatory challenges that affect adoption. Finally, it identifies open research questions and future directions necessary for building scalable, privacy-aware, and interoperable decentralized database ecosystems suitable for enterprise and multi-stakeholder environments.
  • Thumbnail Image
    ItemOpen Access
    Medi-Fly-DR: A Communication-Enabled UAV Micro-Infrastructure for Disaster-Resilient Healthcare Logistics
    (Sri Lanka Institute of Information Technology, 2026-05-21) Raveendran, K; Vithiyasahar, V; Karuneswaran, G; Abeygunawardhana,P.K.W
    Disasters disrupt healthcare delivery by damaging transport routes and weakening the communication infrastructure required to coordinate time-critical medical logistics. This paper presents Medi-Fly-DR, a safety-aware, IoT-enabled UAV framework designed as a communication-integrated microinfrastructure for disaster-resilient healthcare logistics. Unlike conventional UAV delivery systems that primarily focus on physical transport, Medi-Fly-DR integrates autonomous medical delivery with real-time telemetry, mission-state visibility, secure data exchange, payload monitoring, dynamic geofencing, and safety-gated mission orchestration within a unified cyberphysical architecture. The framework is validated through controlled field trials using an industry-grade multirotor UAV over 1–2 km routes, supported by route-matched road baselines and fault-injection experiments. Experimental results demonstrate an approximately 80% reduction in delivery time compared with road transport, a 96% mission success rate, and safe recovery under low-battery, communication-loss, and high-wind conditions. Continuous telemetry enables real-time monitoring of mission progress, payload status, and system health, supporting traceable, coordinated, and fault-aware healthcare response. These findings show that Medi-Fly-DR functions not merely as a UAV delivery mechanism, but as an information-centric aerial infrastructure for maintaining healthcare continuity in disaster affected and resource-constrained environments.