Haris Georgiadis

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A lot of research has been conducted by the database community on methods and techniques for efficient XPath processing, with great success. Despite the progress made, significant opportunities for optimization of XPath still exist. One key to further improvements is to utilize more effectively existing facilities of relational RDBSes for the processing of(More)
The creation of a generic and modular query optimization and processing infrastructure can provide significant benefits to XML data management. Key pieces of such an infrastructure are the physical operators that are available to the execution engine, to turn queries into execution plans. Such operators, to be efficient, need to implement sophisticated(More)
The results of a placebo-controlled, double-blind cross-over study in 13 patients with angina pectoris demonstrated that daily application of a newly developed, transdermal therapeutic system for the administration of nitroglycerin (NTG-TTS) over a period of 14 days reduced the daily frequency of anginal attacks by 67%, and the daily consumption of nitrates(More)
This work describes a method for processing XPath on a relational back-end that significantly limits the number of SQL joins required, takes advantage of the strengths of modern SQL query processors, exploits XML schema information and has low implementation complexity. The method is based on the splitting of XPath expressions into Primary Path Fragments(More)
We present a complete XPath cost-based optimization and execution framework and demonstrate its effectiveness and efficiency for a variety of queries and datasets. The framework is based on a logical XPath algebra with novel features and operators and a comprehensive set of rewriting rules that together enable us to algebraically capture many existing and(More)
Dermatofibrosarcoma Protuberans of the vulva is an extremely rare low grade sarcoma of the dermis. Wide local excision is the recommended treatment while a more radical surgery may be needed in cases of recurrences. Follow up must be prolonged for a long time since tumors may recur even after considerable period.
We present an Open Cultural Digital Content Infrastructure, a platform providing a coherent suite of loosely-coupled services that aim to promote metadata quality in repositories and facilitate metadata data and digital content reuse. The key functions of the infrastructure are the aggregation of metadata and digital files and the automatic validation of(More)
Most aggregators face challenges regarding searchability, discoverability and visual presentation of the content due to metadata heterogeneity. Fully automated enrichment in most cases is not sufficient. We developed semantics.gr, a tool for massive semantic enrichment and contextualization of content that combines a curator/expert metadata mapping suite(More)