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Dependability aspects of language technology infrastructure

Walkowiak T., Pol M.

Journal of Polish Safety and Reliability Association

2018

Vol. 9, No. 3

101--108

The paper presents dependability analysis of CLARIN-PL Centre of Language Technology (CLT). It describes infrastructure, high availability aspects and micro-service architecture used in CLARIN-PL applications. Microservices architecture improves dependability in respect to availability and reliability and to some extent safety. It is comprised of the mechanisms of reliable communication of applications, replication, recovery, and transaction processing. CLT has also a set of components for failure detection, monitoring and autonomic management, and distributed security policy enforcement.

Open Stylometric System WebSty : Integrated Language Processing, Analysis and Visualisation

Piasecki M., Walkowiak T., Eder M.

Computational Methods in Science and Technology

2018

Vol. 24, No. 1

43--58

The paper presents an open, web-based system for stylometric analysis named WebSty, which is a part of the CLARIN-PL research infrastructure. WebSty does not require local installation by users, can be used via any web browser, offers rich set-up, and runs on a computing cluster.We discuss the underlying ideas of the system, its architecture, a pipeline of language tools for processing Polish, and its integration with systems for clustering, visualizing the results of clustering, and identifying the features of the strongest discrimination power. The techniques used for feature weighting and text similarity measuring are also concisely overviewed. In conclusions, we present preliminary evaluation of WebSty on the corpus of 1000 literary works, and we report on the results of the first research applications of WebSty. Even if the system was initially focused on processing Polish texts, we also briefly discuss its development towards a multilingual system, which already supports English, German and Hungarian.

The impact of administrator working hours on the reliability of the Centre of Language Technology

Walkowiak T., Pol M.

Journal of Polish Safety and Reliability Association

2017

Vol. 8, No. 1

167--174

The paper presents reliability analysis of CLARIN-PL Centre of Language Technology (CLT). The CLT is a Polish part of the language technology infrastructure developed by CLARIN project. The main goal of which is to support researchers in humanities and social sciences. The infrastructure is a complex computer system that enables combining language tools with language resources into processing chains. Authors present the system structure, analyse types of faults and define the CLT reliability model. The model takes into account the fact the time gap, between the failure and the repair of the system is not exponential since repair actions are taken only when administrators are at work (assuming that administrators are not working 24/7). The model is used to estimate reliability metrics (mean time and 90th percentile of relative down time and relative partial operational time) by a use of Monte-Carlo simulation. Moreover, analysis of possible improvement in the CLT organisation and its influence on the estimated metrics is given.