The next meeting of the Information Modeling Seminar will be held on February 22 (Thursday), at 2 p.m., in room 503 of IMI-BAS. A talk on: Integrating relational data and unstructured big data with a functional SQL-like query language will be delivered by Senior Assist. Prof. Boyan Kolev. Abstract: Polystore systems have been proposed to provide integrated access to multiple, heterogeneous data stores through a single query engine. In particular, much attention is being paid on the integration of relational data with unstructured big data typically stored in HDFS. One typical legacy solution is to use a relational query engine that allows SQL-like queries to retrieve data from HDFS, which requires the system to provide a relational view of the unstructured data and hence is [...]

The next meeting of the seminar of the Information Modelling Department will be held on June 7, 2022, Tuesday, at 2:00 pm (UCT+3) in Room 278 of the Institute of Mathematics and Informatics - BAS. Assoc. Prof. Rumen Dimitrov will deliver a talk on Application of NGS technology for analysis of pathogen-host interactions.  Annotation: C. glabrata is an opportunistic fungal pathogen. Its clinical isolates show great genomic plasticity. This allows C. glabrata to adapt to different niches of the host by changing the number and size of chromosomes and by rearranging its genome.  At the first stage of the project КР-06-31/19 one of the main tasks is the sequencing and annotation of a strain of C.glabrata isolated from an ecological niche. The aim is to [...]

The next meeting of the seminar of the Information Modelling Department will be held on May 31, 2022, Tuesday, at 2:00 pm (UCT+3). Assoc. Prof. Oksana Kharchenko from the Department of Media Engineering and Information Radio Electronic Systems of Kharkiv National University of Radio Electronics, Ukraine will deliver a talk on IDENTIFICATION AND VISUALIZATION OF ELECTROENCEPHALOGRAM INFORMATIONAL CHARACTERISTICS.  Abstract: Nowadays the numerical methods of EEG analysis (in main, spectral and correlation analysis) are finding ever increasing application. An advantage of these methods consists in the elimination of subjectivity, being inevitable for a visual analysis. It is important for the clinical neurophysiologist to know when this or that rhythm appeared. But spectral analysis does not show the change in the signal over time. This disadvantage partially [...]

The next meeting of the seminar of the Information Modelling Department will be held on May 17, 2022, Tuesday, at 2:00 pm (UCT+3) in the Meeting Room of the Institute of Mathematics and Informatics. Slavi Georgiev will deliver a talk on Numerical reconstruction of time-dependent volatility in the Black-Scholes market model.  Abstract: In this report, numerical algorithms to solve the inverse problem of time-dependent volatility reconstruction from European option quotes are proposed. Following the Black–Scholes framework, we calibrate the models to obtain the volatility term structure. The first algorithm is based on solving auxiliary problems that help to reconstruct the unknown volatility function in step-by-step manner over each temporal node. The option price is decomposed with respect to the volatility. The algorithm requires point or integral [...]

The next Information Modelling seminar will be held on July 7, 2021 (Wednesday) at 2 p.m. (UTC +3) in the Conference Room of IMI-BAS and online in Zoom. Assoc. Prof. Venelin Todorov will deliver an inaugural lecture on Advanced stochastic approaches for modelling of large scale complex systems Abstract: Many scientific and engineering applications are based on the problems of solving multidimensional integrals, integral equations and systems of linear algebraic equations. The computational time for very large-scale problems or for finding solutions in real-time, can be limited and this restricts the usage of many established algorithms. Monte Carlo algorithms give statistical estimates of the required solution, by performing random sampling of a random variable, which mathematical expectation is the desired solution. Advanced highly efficient Monte Carlo methods for [...]

The next meeting of the INFORMATION MODELING Seminar will be held online on June 17, 2021, at 2:00 pm. A talk on: Bioinformatics methods for analysis of “omics” data will be delivered by Roumyana Yordanova, Hokkaido University, Sapporo, Japan. Abstract: The term “Big Data” in biology is often associated with the so called “omics” data which include whole genome and exome sequences, RNA expressions, DNA polymorphisms and mutations, epigenetic modifications, protein spatial structures. Some of the main problems in the analysis of such data are their huge size, the different ways they are generated and the different levels of complexity. In this talk I will present general bioinformatics approaches for analysis, integration and interpretation of “omics” data as well as results from their use. The [...]

The next meeting of the INFORMATION MODELING Seminar will be held on November 11, 2018, at 14:00 in Room 276 of IMI. A talk on: Towards Future Communication Ecosystems: Where Networking Technology Meets Microeconomics and User Research will be delivered by Prof. Peter Reichl, Head of Research Group Cooperative Systems, University of Vienna, Austria. Everybody is invited. Abstract. Over the last years, research in telecommunication networking has evolved far beyond traditional communications engineering and rather aims at integrating the perspectives of a broad variety of stakeholders into a holistic ecosystem framework. In this talk, we will discuss key aspects of this interdisciplinary approach and illustrate it with the help of some results from the area of Quality of Experience (QoE) as an interesting example of a corresponding research field, before we briefly outline the impact of the underlying paradigm change on the current evolution from the Internet of Things (IoT) towards an "Internet of People" (IoP). CV: Peter Reichl holds a Master’s degree from University of Cambridge (UK) and a PhD degree in computer science from RWTH Aachen (Germany). 2001-2013 he was working as Key Researcher for "User-centered Interaction and Communication Economics" at FTW Telecommunications Research Center Vienna (Austria). 2010 – 2013 he was  holder of the SISCOM and RBUCE WEST International Research Chairs at [...]

The next meeting of the INFORMATION MODELING Seminar will be held on October 4, 2018, at 14:00 in Room 578 of IMI. A talk on: A New Monte Carlo Algorithm for Linear Algebraic Systems Based on the "Walk on Equations" Algorithm will be delivered by Assist. Prof. Dr. Venelin Todorov, IMI - BAS. Everybody is invited. Abstract. Many scientific and engineering applications are based on the problems of solving systems of linear algebraic equations. The computation time for very large problems, or for finding solutions in real-time, can be prohibitive and this prevents the use of many established algorithms. Monte Carlo algorithms give statistical estimates of the required solution, by performing random sampling of a random variable, whose mathematical expectation is the desired solution. A [...]

The next meeting of the INFORMATION MODELING Seminar will be held on July 12, 2018, at 14:00 in Room 578 of IMI. A talk on:: Factorization Machines – Current Status and Prospects will be delivered by Evgeniy Marinov, Soleil Labs, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences Everybody is invited.