René's URL Explorer Experiment

      {"@context":"http://schema.org","@graph":[{"@type":"PublicationIssue","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"name":"APDL: A Reference XML Schema for Process-centered Definition of RFID Solutions","url":"https://www.linkedin.com/redir/redirect?url=http%3A%2F%2Fdx%2Edoi%2Eorg%2F10%2E1016%2Fj%2Ejss%2E2011%2E02%2E036&urlhash=ojeR"},{"@type":"PublicationIssue","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"name":"Generating Business Events in an RFID Network"},{"@type":"PublicationIssue","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"name":"Supply Chain Management and NFC Picking Demonstrations using the AspireRfid Middleware Platform"},{"@type":"PublicationIssue","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"name":"Middleware Building Blocks for Architecting RFID Systems"},{"@type":"PublicationIssue","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"name":"Bridging RFID Systems and Enterprise Applications through Virtualized Connectors","url":"https://www.linkedin.com/redir/redirect?url=http%3A%2F%2Fwww%2Eait%2Egr%2Fexport%2Fsites%2Fdefault%2Fait_web_site%2FResearcher%2Fnkef%2FPapers%2FLeontiadis_IJAIT-RFID-Connectors_Final%2Epdf&urlhash=PtD1"},{"@type":"PublicationIssue","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"name":"Design Principles for Utility-Driven Services and Cloud-Based Computing Modelling for the Internet of Things","url":"https://www.linkedin.com/redir/redirect?url=http%3A%2F%2Fwww%2Einderscience%2Ecom%2Finfo%2Finarticle%2Ephp%3Fartid%3D60254&urlhash=z_JY","description":"By following an analysis of the state of the art in the convergence of cloud computing and the Internet of Things (IoT), this paper presents design principles for the IoT in cloud environments. A framework for on-demand establishment of IoT services based on the automated formulation of societies of internet-connected objects is described and the interactions between architecture modules are explained in detail to validate this approach. The main building blocks of the functional framework and its operational components follow the utility-driven cloud-based computing model. The framework leverages well-known technologies (i.e. linked sensor data) and standards (notably the W3C semantic sensor networks ontology). Finally, an example for service formulation and delivery of services for a smart campus scenario is provided and discussed. This paper also introduces some experiment results using the utility-driven service formulation model for mobile applications."},{"@type":"PublicationIssue","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"name":"OpenIoT: Open Source Internet-of-Things in the Cloud","url":"https://www.linkedin.com/redir/redirect?url=http%3A%2F%2Fdblp%2Euni-trier%2Ede%2Fdb%2Fconf%2Fsoftcom%2Fopeniot2014%2Ehtml%23SoldatosKHSCRAJ14&urlhash=8c36","description":"Despite the proliferation of IoT platforms for building and deploying IoT applications in the cloud, there is still no easy way to integrate heterogeneous geographically and administratively dispersed sensors and IoT services in a semantically interoperable fashion. In this paper we provide an overview of the OpenIoT project, which has developed and provided a first-of-kind open source IoT platform enabling the semantic interoperability of IoT services in the cloud. At the heart of OpenIoT lies the W3C Semantic Sensor Networks (SSN) ontology, which provides a common standards-based model for representing physical and virtual sensors. OpenIoT includes also sensor middleware that eases the collection of data from virtually any sensor, while at the same time ensuring their proper semantic annotation. Furthermore, it offers a wide range of visual tools that enable the development and deployment of IoT applications with almost zero programming. Another key feature of OpenIoT is its ability to handle mobile sensors, thereby enabling the emerging wave of mobile crowdsensing applications. OpenIoT is currently supported by an active community of IoT researchers, while being extensively used for the development of IoT applications in areas where semantic interoperability is a major concern."},{"@type":"PublicationIssue","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"name":"A Visual Paradigm for IoT Solutions Development","url":"https://www.linkedin.com/redir/redirect?url=http%3A%2F%2Fdblp%2Euni-trier%2Ede%2Fdb%2Fconf%2Fsoftcom%2Fopeniot2014%2Ehtml%23KefalakisSAD14&urlhash=V5FH","description":"Despite the proliferation of Internet-of-Things (IoT) applications and services, there are still very few tools and techniques for developing IoT solutions in a visual fashion through minimal (or even) zero programming. In this paper we introduce a novel approach for developing IoT solution through visual development tools. 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In this paper we introduce a novel approach for developing IoT solution through visual development tools. The presented approach presents several advantages, in particular: (a) It leverages standards-based semantic models for sensors and IoT context (notably the W3 SSN ontology), (b) It is based on popular/mainstream web-based technologies (i.e. SPARQL, REST), (c) It provides a basis for integrated development of IoT services on the basis of a W3C SSN based Model Driven Architecture (MDA), (d) It is implemented as open source software as part of the OpenIoT open source project."},{"@type":"PublicationIssue","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"name":"A Visual Paradigm for IoT Solutions Development","url":"https://www.linkedin.com/redir/redirect?url=http%3A%2F%2Fdblp%2Euni-trier%2Ede%2Fdb%2Fconf%2Fsoftcom%2Fopeniot2014%2Ehtml%23KefalakisSAD14&urlhash=V5FH","description":"Despite the proliferation of Internet-of-Things (IoT) applications and services, there are still very few tools and techniques for developing IoT solutions in a visual fashion through minimal (or even) zero programming. In this paper we introduce a novel approach for developing IoT solution through visual development tools. The presented approach presents several advantages, in particular: (a) It leverages standards-based semantic models for sensors and IoT context (notably the W3 SSN ontology), (b) It is based on popular/mainstream web-based technologies (i.e. SPARQL, REST), (c) It provides a basis for integrated development of IoT services on the basis of a W3C SSN based Model Driven Architecture (MDA), (d) It is implemented as open source software as part of the OpenIoT open source project."},{"@context":"https://schema.org","@type":"DiscussionForumPosting","author":{"@type":"Person","name":"Nikos Kefalakis","url":"https://gr.linkedin.com/in/kefnik"},"datePublished":"2026-02-18T02:04:18.166Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"http://schema.org/LikeAction","userInteractionCount":70},"mainEntityOfPage":"https://www.linkedin.com/posts/kefnik_a-small-update-from-my-side-recently-my-activity-7429707302447865857-a-av","text":"A small update from my side.\nRecently, my role evolved to Principal Architect.\n\nThe focus remains the same: designing modular and reusable platforms across IoT, Data Spaces and Digital Twins, enabling scalable data and AI workflows, mentoring teams, and helping projects turn ideas into working systems.\n\nGrateful to the colleagues and partners who make this journey possible.","url":"https://www.linkedin.com/posts/kefnik_a-small-update-from-my-side-recently-my-activity-7429707302447865857-a-av"},{"@type":"WebPage","reviewedBy":{"@type":"Person","name":"Nikos Kefalakis"},"url":"https://gr.linkedin.com/in/kefnik"},{"@context":"http://schema.org","@type":"Person","address":{"@type":"PostalAddress","addressCountry":"GR","addressLocality":"Moskháton, Attiki, Greece"},"alumniOf":[{"@type":"EducationalOrganization","name":"Aalborg University","url":"https://dk.linkedin.com/school/aalborg-universitet/","member":{"@type":"OrganizationRole","description":"Thesis Title: Programmable Framework for the Automated Deployment of Intelligent 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