Vladimir Trunov

• Candidate of Engineering
• Senior Researcher at Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute)

We address the lifelong machine learning problem. Within the game-theoretic approach, in the calculation of the next prediction we use no assumptions on the stochastic nature of a source that generates the data flow: the source can be either analog, or algorithmic, or probabilistic; its parameters can change at random times; when constructing a pre...

В монографии представлены результаты собственных исследований того, как ведут себя перевитая ткань гепатокациномы и здоровая ткань печени в теле модельного животного, а также реакции модельных животных контрольной группы на введение физиологического раствора. Приведены результаты сравнения скорости изменения массы и объема перевитой ткани. Представ...

The aim of the work is to evaluate the planarity of the QRS loop and its relationship with systolic dysfunction of the left ventricle in patients in the subacute period of myocardial infarction (MI). Materials and methods. The ECG of 265 patients with a diagnosis of acute myocardial infarction were analyzed. The control group consisted of 55 health...

Introduction . The prevalence of arterial hypertension (AH) among the adult population of Russia is high; up to 48% of deaths are due to its complications. Recently, prognostic indicators of the electrocardiogram (ECG) have attracted the attention of researchers. One of them is the QRS-T spatial angle (sQRS-Ta).The aim of the work is to study what...

Aim: To explore the features of vectorcardiograms (VCG) of patients with essential hypertension complicated by chronic heart failure with reduced left ventricular ejection fraction (CHFrLVEF). Materials and methods: We analyzed VCGs of 70 hypertensive patients with CHFrLVEF and 275 hypertensive patients without clinical signs of CHF and with LVE...

Aim . To evaluate medium-term survival without irreversible and fatal cardiovascular events in individuals with a high spatial QRS-T angle (sQRS-Ta) from a regional Russian sample. Material and methods . We analyzed 1394 electrocardiographic records from a random regional sample of men (30%) and women aged 25-64, which were included in the ESSE-RF1...

In this paper, we consider the problem of online probabilistic time series forecasting. The difference between a probabilistic prediction (distribution function) and a numerical outcome is measured using a loss function (scoring rule). In practical statistics, the Continuous Ranked Probability Score (CRPS) rule is often used to estimate the discrep...

Trained detection dogs distinguish between urine samples from healthy organisms and organisms with malignant tumors, suggesting that the volatile urine metabolome contains information about tumor progression. The aim of this study was to determine whether the stage of tumor growth affects the chemical differences in the urine of mice and to what ex...

Theoretical grounds of integral vectors of ventricular depolarization and repolarization and their sum, i.e., the spatial ventricular gradient, have been studied. A systematic description and biophysical interpretation of these parameters are presented based on the distribution of cardiomyocyte action potential parameters in the inhomogeneous bidom...

The paper presents numerical experiments and some theoretical developments in prediction with expert advice (PEA). One experiment deals with predicting electricity consumption depending on temperature and uses real data. As the pattern of dependence can change with season and time of the day, the domain naturally admits PEA formulation with experts...

The paper presents numerical experiments and some theoretical developments in prediction with expert advice (PEA). One experiment deals with predicting electricity consumption depending on temperature and uses real data. As the pattern of dependence can change with season and time of the day, the domain naturally admits PEA formulation with experts...

Aim . To study the associations of increased spatial QRS-T angle (sQRS-Ta ≥90°) with cardiovascular risk factors (RFs). Material and methods . We analyzed 1411 electrocardiography (ECG) records of men and women aged 25-64 years from a random regional sample of the Epidemiology of Cardiovascular Diseases and their Risk Factors in Regions of Russian...

We develop the setting of sequential prediction based on shifting experts and on a "smooth" version of the method of specialized experts. To aggregate experts predictions, we use the AdaHedge algorithm, which is a version of the Hedge algorithm with adaptive learning rate, and extend it by the meta-algorithm Fixed Share. Due to this, we combine the...

Probabilistic forecasts in the form of probability distributions over future events have become popular in several fields of statistical science. The dissimilarity between a probability forecast and an outcome is measured by a loss function (scoring rule). Popular example of scoring rule for continuous outcomes is the continuous ranked probability...

Within the prediction (decision making) theory with online experts, an adaptive algorithm is proposed that aggregates the decisions of expert strategies and incurs losses that do not exceed (up to a certain value, called a regret) the losses of the best combination of experts distributed over the prediction interval. The algorithm develops the Mixi...

We develop the setting of sequential prediction based on shifting experts and on a "smooth" version of the method of specialized experts. To aggregate experts predictions, we use the AdaHedge algorithm, which is a version of the Hedge algorithm with adaptive learning rate, and extend it by the meta-algorithm Fixed Share. Due to this, we combine the...

The problem of decision theoretic online learning is discussed. There is the set of methods, experts, and algorithms capable of making solutions (or predictions) and suffering losses due to the inaccuracy of their solutions. An adaptive algorithm whereby expert solutions are aggregated and sustained losses not exceeding (to a certain quantity calle...

We consider an online adaptive forecasting algorithm for time series elements. Based on this algorithm, we define a universal strategy for the financial market: such a strategy ensures asymptotically maximal profit compared to any trading strategy where decisions are made based on rules that depend continuously on the input information. To reduce r...

The problem of speaker recognition from a given set of speakers for any language and any context is considered. A database of Russian numerals that contains speech segments from 216 men and 177 women, each of whom spoke from 400 to 800 words, is used for recognition. Speech has been recorded on different types of microphones in different rooms at t...

Changes of the vectrocardiographic ventricular gradient (VG) in patients with pulmonary arterial hypertension (PAH) are indicative of right ventricular (RV) overload and may be used to assess its severity. The study aim was to evaluate interrelations between vectrocardiographic VG, spatial QRS-T angle and echocardiographic parameters of structural-...

In the first part of the paper, a universal method of algorithmic trading in stock markets, which provides the asymptotically highest profit as compared to any trading strategy that is not extremely complex, is proposed. The universal strategy is compared with the class of strategies that compute the amount of bought or sold units of a financial in...

Aim: to study the possibilities of electrocardiographic and decartographic parameters to identify and assess the severity of overload of the right ventricle in pulmonary arterial hypertension (PAH) patients. Material and methods. Decartographic parameters of the activation duration and repolarization acceleration were studied in 120 patients with P...

Speaker recognition is carried out in the space of the functional parameters of the area of the glottal cross-section, found by solving the inverse problem. This problem is solved in two stages: first, the signal obtained by inverse filtering is approximated using the vocal source model, and then the glottal area model parameters, which generate th...

We present a universal algorithm for online trading in Stock Market which performs asymptotically at least as good as any stationary trading strategy that computes the investment at each step using a fixed function of the side information that belongs to a given RKHS (Reproducing Kernel Hilbert Space). Using a universal kernel, we extend this resul...

A trading strategy based on a natural learning process, which asymptotically outperforms any trading strategy from RKHS (Reproduced Kernel Hilbert Space), is presented. In this process, the trader rationally chooses his gambles using predictions made by a randomized well calibrated algorithm. Our strategy is based on Dawid's notion of calibration w...

We provide a natural learning process in which a financial trader without a risk receives a gain in case when Stock Market is inefficient. In this process, the trader rationally choose his gambles using a prediction made by a randomized calibrated algorithm. Our strategy is based on Dawid's notion of calibration with more general changing checking...

Linear deformation of the myocardium results in a linear transformation of orthogonal electrocardiosignals under the condition of topological invariability of the depolarization and repolarization processes in the myocardium. The relation between the linear transformations in the physical and functional spaces was found. Several practically importa...

The aim of this study was to verify a new criterion of hypertension-related left ventricular hypertrophy (LVH) on the basis of the dipole electrocardiotopographic technique, which provides intelligible pictorial patterns and efficient quantitative parameters for recognition of pathologic states of the heart. Standard 12-lead and vectorcardiographic...

The aim of this work was to describe a new approach to noninvasive differential diagnosis of left and right ventricular hypertrophies (LVH and RVH) caused by the arterial or lung hypertensions. The vectorcardiographic measurements were analyzed by means of dipolar electrocardiotopography (DECARTO) technique based upon a simplified spherical model o...

To estimate the informative value of orthogonal ECG parameters for the diagnosis of left ventricular hypertrophy (LVH). The study comprised 142 apparently healthy individuals and 125 patients with arterial hypertension (AH) and LVH (left ventricular mass index more than 125 g/m2 for males and more than 110 g/m2 for females). Characteristic curves (...

The aim of the present study was to investigate the reflection of psychoemotional stress in the body surface potential distribution as documented by isointegral maps of cardiac activation and recovery. In 72 young men (18.3+/- 7.3 y.) with no cardiovascular history body surface potential maps (BSPMs) at rest and during the test of mental arithmetic...

Some results of mathematical modeling of an electrocardiographic method for location of cardiac ischemic injury are presented. The method uses unipolar signals of classical Frank lead electrodes, which are sensitive to the spatial position of the electrogenic regions in the myocardium. The values of lead signals corresponding to the shifted ST segm...

To show possibilities of dipolar electrocardiography (DECG) in diagnosis of left ventricular hypertrophy (LVH). We made DECG in 151 healthy subjects and 158 hypertensive patients. To characterize DECG quantitatively, we used the integral activation duration index (IADI) calculated as a weighted sum of the areas with different duration of activation...

This paper presents an overview on the design and implementation of a computer system for the interpretation of home monitoring data of diabetic patients. The comprehensive methodology covers the major information processing steps leading from raw data to a concise summary of what has happened between two subsequent visits. It includes techniques f...

An ECG lead system with a relatively small number of electrodes is proposed. The system is used to measure the heart's electric field at the body surface. The system contains 16 electrodes, which are numbered 1 to 16. The potentials are measured synchronously in a single-pole scheme for each electrode relative to the right hand. The single-pole sig...

Using mathematical models of the bioelectric generators of the heart with surface distributed configurations, it was shown that the coordinates of the moving electric center of the heart can facilitate the recognition of the global spatial position of electrogenic zones in the myocardium. These coordinates were determined by the previously proposed...

A method for determination of the cardiac electric center on the basis of noninvasive multichannel measurements and multipole description of the cardioelectric potential is proposed. The method provides a more accurate and stable spatial location of the cardioelectric generator as compared to other methods (in particular, those based on minimizatio...

A method for determination of the cardiac electric center on the basis of noninvasive multichannel measurements and multipole description of the cardioelectric potential is proposed. The method provides a more accurate and stable spatial location of the cardioelectric generator as compared to other methods (in particular, those based on minimizatio...

The Decarto technique was used to study the orthogonal ECGs recorded in 23 subjects during parabolic flights (44 records). A parameter of the instantaneous decartograms, namely the activation area (AA), which is the total area of the depolarization front projection on the image sphere, was analyzed. We compared the values of AA during the periods o...

Possibility of determination of the heart electric potential maps on the spherical quasiepicardium from the body surface potentials measured by means of multiple leads, is estimated. The simplified models of ventricular depolarization electric generator considered in this study, consist of sets of uniform double layers representing basic configurat...

Possibility of determination of the heart electric potential maps on the spherical quasiepicardium from the body surface potentials measured by means of multiple leads, is estimated. The simplified models of ventricular depolarization electric generator considered in this study, consist of sets of uniform double layers representing basic configurat...

Long-term observation of the heart state during specialized professional activities plays an important part in preventive medicine. This study is aimed at assessment of electrophysiological state of heart in astronauts by common electrocardiography, vectorcardiography, and dipole electrocardiotopography (DECARTO technique). The subjects observed we...

An improvement of the electrocardiographic body surface potential mapping technique is proposed to provide more explicit recognition of excitation processes in the heart by means of calculation of the potential distribution on the spherical quasiepicardium and separation of its extremum regions. The method is illustrated with cases of ventricular e...

A procedure was proposed for non-invasive mapping of the cardiac electrical potential or a spherical quasiepicardium from its synchronous multichannel measurement on the surface of the chest, i.e. routine electrocardiodraphic mapping. Mathematical simulation was used to demonstrate that the quasiepicardial potential can be calculated with the accur...

Electrocardiographs of the fourth generation provide synchronous multilead monitoring of electric potentials measured by an array of electrodes spread over the patient's chest. Parameters of the cardiac electric generator (cardiogenerator) directly representing its electrophysiological status can be found under such settings by solving the so-calle...

A system of leads for electrocardiographic mapping has been suggested. The system provides sufficient accuracy of clinical mapping of the electric potential of the heart over the total surface of the chest with a number of electrodes close to possible minimum. Design of the maps of cardiac potential has been performed according to original techniqu...

A lead system is described for measuring the electric field of the heart on the surface of the thorax. It is sufficiently accurate and convenient for electrocardiographic mapping under clinical conditions. A method of quasimultipole approximation of the potential is presented. This is based on the expansion of the latter in a series of spatial sphe...

A discussion is presented of the possibilities of abridged description of curves, associated with the issue of the least deviation of a specified approximation operator on the set of parametric representations of the curve. As one such abridgement method, the article considers choosing representations whose approximation for complex-valued function...