Athanassios Hatzis
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Profile Information

Short Bio:
Dr. Athanassios Hatzis is the founder of HEALIS, an international alliance of independent professionals and consultants in the emerging field of data science. He has been a Health Information Technology Managing Director in the Department of Neurosurgery in the University of Athens situated at “Evangelismos” General Hospital for four years. Besides his Health IT management skills, Athanassios I. Hatzis has a strong research background in clinical applications of Speech Technology. He has spent ten years on research and education in top U.K universities and he has published both in Speech Technology and neurotechnology sectors in peer reviewed journals and conferences. He is currently active in database modelling and semantic web technology.
Job Title:
IT Expert & Research Scientist/Engineer
LinkedIn Profile:
Finding a new position, Networking, New venture

Athanassios Hatzis's Blog

TriaClick - Associative Semiotic Hypergraph technology on a Columnar DBMS

Posted on February 11, 2019 at 10:30am 0 Comments

Screen Capture Demo of TriaClick, the latest release of TRIADB, a python console application that implements associative, semiotic, hypergraph technology on top of ClickHouse columnar DBMS and …


Data Modelling Topologies of a Graph Database

Posted on June 17, 2017 at 3:00am 0 Comments

The associative data graph database model is still a heavy hitter, stacking up well against property graphs and triples/quadruples. Expect a comeback.


There is a lot of confusion with the definition of graph databases. In my opinion, any definition that avoids any reference to the semantics of nodes and edges or their internal structure…


A Quick Guide on How to Prevail in the Graph Database Arena

Posted on February 13, 2017 at 10:30pm 2 Comments


There are endless discussions on the databases arena about which DBMS is best suited for operational or data warehousing analytics, which one is the most efficient for online transaction processing, or which one is suitable for semantic integration. Recently graph databases are growing in popularity, especially in the enterprise space, and perhaps that adds more headache on those vendors that try to differentiate from competition…


Towards a New Data Modelling Architecture - Part 2

Posted on October 12, 2016 at 12:30am 0 Comments

Atomic Information Resource (AIR)

How do we design a data model, how do we connect data, how do we represent information, how do we store or retrieve them ? These are all fundamental questions in data modeling but there is a common key to unlock them. You have to start by defining a primitive information resource, and then understand how one can build complex information structures on top of…


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