Mikov A.,Petrozavodsk State University
2016 IEEE 3rd International Symposium on Wireless Systems within the IEEE International Conferences on Intelligent Data Acquisition and Advanced Computing Systems, IDAACS-SWS 2016 - Proceedings | Year: 2016
In the following work the multi-mode inertial tracking system is proposed. The system tries to bypass the constraints regarding the device placement and typical usage scenario. The system consists of four principal modules. The first one is the data pre-processing and calibration module: it automatically calibrates the accelerometer, gyroscope and magnetometer sensors. The simple calibration is employed for the accelerometer and the gyroscope, while the magnetometer is being calibrated in realtime using Stochastic Gradient Descent approach. The second module recovers the trajectory of the pedestrian and is able to separate the forward and backward steps of the user. The third module is an orientation estimation filter with magnetometer disturbance detector. For orientation estimation a well-known complementary filter is employed. To adaptively tune the magnetometer filter gain the residuals between the virtual gyroscope and the real one are continuously handled. The fourth module is responsible for the power management of the whole system. The key features of the proposed system is that it does not restrict typical user behaviour, automatically adapts to the used sensors and could be easily fused with any existing localization technology. The first section of the paper is devoted to the practical aspects of implementation of such system for embedded devices. © 2016 IEEE.
Kulakov K.,Petrozavodsk State University
International Journal of Embedded and Real-Time Communication Systems | Year: 2017
Nowadays amount of "smart" services in e-Tourism is growing rapidly. This is due to widespread use of mobile devices with new input methods and large amount of digitized data. In addition, Internet of Things and Big Data analytics has a major impact on development of e-Tourism services and cultural heritage services. At the same time the smart services implementation requires complex methods and high cost of their creation. Thereby there is an actual problem to estimate efficiency of smart services. This paper presents an approach to efficiency evaluation of services with smart attributes. The evaluation is based on service's work time utilization and required manual work. For each used attribute the execution scenario, ordinary (non-smart) service for comparison and used estimates are defined. Each estimate is calculated by taking into account the user's experience. Presented approach is relevant for smart services with big data analytics. The demonstration of the approach was carried out using Cultural trip planning service with possible ordinary services.
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: HEALTH-2007-2.4.3-1 | Award Amount: 7.70M | Year: 2008
Preliminary data indicate that there is a strong association between the incidence of immune-mediated diseases and improving standard of living and hygiene. One of the steepest gradient in standard of living worldwide is present at the border between Russian Karelia and Finland with a sevenfold difference in the gross national product, while Estonia represents a country in rapid transition. These three populations comprise a living laboratory providing a unique possibility to test the hygiene hypothesis in the development of immune-mediated diseases. The incidence of type 1 diabetes (T1D) is six times lower in Russian Karelia than in Finland, whereas there are very limited differences in the frequency of risk HLA genotypes in the background population. This proposal aims at comparing (i) the frequency of beta-cell autoimmunity and other organ-specific autoantibodies; (ii) the frequency of IgE-specific sensitisation and signs of allergy; (iii) the frequency of various infections; (iv) the gut microbial flora; and (v) dietary intake in young children between the three populations. The birth cohort arm of the study aims at (i) delineating the ontogeny of the immune system by using modern tools of functional genomics; (ii) comparing the functional characteristics of regulatory T cells; (iii) characterising the gut microbial colonisation in infants; (iv) assessing the timing of exposure to foreign proteins in infancy (v) defining the interrelations between dietary factors, gut microbial flora and acute microbial infections. The objectives will be approached by studying 1600 children at the age of 3 and 5 years and by observing a birth cohort comprising about 320 subjects with HLA-conferred susceptibility to autoimmunity from birth up to the age of 3 years in each country. This proposal is expected to provide new data on the reasons and mechanisms behind the increasing rates of T1D and other immune-mediated diseases seen in most developed countries after World War II.
Pergament A.,Petrozavodsk State University |
Velichko A.,Petrozavodsk State University
Thin Solid Films | Year: 2010
Vanadium dioxide has various potential applications in electronics due to the metal-insulator transition (MIT). It is known that oxide structures with nanometric dimensions exhibit properties different from bulk oxide materials because of the spatial confinement and the proximity of the substrate. However, in order to integrate VO 2 into the thriving nano-scale electronics, it is necessary to explore the MIT in this material in thin film nano-structures. In this work, it is shown that there is a fundamental dimensional restriction for the transition to occur even for pure epitaxial VO 2 nano-films and nano-wires. This is associated with the fact that any phase transition turns out to be impossible when the system size is decreased below a certain characteristic length d c. This dimension is estimated to be d c ∼ ξ (where ξ is the correlation length, ∼ 2 nm for VO 2), and, on the basis of the available experimental data, it is shown that the transition temperature falls as the characteristic size (film thickness or nano-wire radius) diminishes, though the predicted theoretical limit of 2 nm is not still experimentally achieved by now. Experimental results concerning the dependence of the threshold voltage on the film thickness at MIT-induced switching in VO 2 based sandwich structures are presented. Finally, the comparison of the authors' experimental data with the literature data, as well as with the analogous features of superconducting phase transitions, is carried out. © 2009 Elsevier B.V. All rights reserved.
Meigal A.Y.,Petrozavodsk State University
Medical Hypotheses | Year: 2013
Here we describe GATO (gravity, age, thermoregulation, and oxygenation) hypothesis (or a "Baby Astronaut" hypothesis) which we suggest to explain synergistic effect of these factors on the motor system. Taken separately, microgravity (in spaceflight, G ∼ 0), the early age, heat and hypoxia exert identical effect on the motor system. We posit that synergy of these factors originate from their synchronicity during intrauterine immersion (analog microgravity) of the fetus in warm hypoxic condition. We further postulate three successive motor adaptive strategies, driven lifelong by gravity as the key factor. The first by age, fetal/microgravity (FM)-strategy, induced by the intrauterine immersion of the fetus, is based on domination of fast type muscle fibers. After birth, thought to be analog for landing from orbit, newborn is subjected to combined influence of cooler ambient temperature, normoxia, and 1G Earth gravity, which cooperatively form a slower GE-strategy. Eventually, healthy ageing results in further domination of slow type muscle fibers that forms the slowest (SL)-strategy. Our hypothesis implies that specific sensory conditions may substitute for each other owing to their synergistic action on the motor system. According to GATO hypothesis heating and hypoxia may be considered as "pro-microgravity" factors, while cold and hyperoxia - as "pro-gravity" ones. As such, cold may act as a partial "surrogate" for gravity, estimated as ∼0.2. G. That may have potential to elaborate countermeasures for muscle atrophy in astronauts either on-board in long-term spaceflight or for post-flight rehabilitation. Based on GATO hypothesis, predictions on muscle remodeling caused by illumination, sound/noise, and gravidity are discussed. © 2012 Elsevier Ltd.
Korzun D.,Petrozavodsk State University
Communications in Computer and Information Science | Year: 2016
Smart spaces define a development approach to creation of service-oriented information systems for computing environments of the Internet of Things (IoT). Semantic-driven resource sharing is applied to make fusion of the physical and information worlds. Knowledge from both worlds is selectively encompassed in the smart space to serve for users’ needs. In this paper, we consider several principles of the smart spaces approach to semantic-driven design of service-oriented information systems. The developers can apply these principles to achieve such properties as (a) involvement for service construction many surrounding devices and personal mobile devices of the user, (b) use of external Internet services and data sources for enhancing the constructed services, (c) information-driven programming of service construction based on resource sharing. The principles are derived from our experience on the software development for such application domains as collaborative work, e-tourism, and mobile health. © Springer International Publishing Switzerland 2016.
Volkov A.S.,Petrozavodsk State University
Signal Processing | Year: 2015
With a growth of the popularity of wireless sensor networks it has became obvious that Bayesian filter is most commonly used method for the sensor localization. The multiple sensors in one device allow to build different variations of the filter through the definition of the components of Bayesian rule. This paper presents a localization algorithm that is based on Bayesian filter and an attempt to evaluate the accuracy of the algorithm for nanoLOC technology. Empirical probability density functions for two Non-Line of Sight (NLOS) cases and different mobile object movement models have been used in the algorithm. The usage of extreme variants of the movement model allows to estimate the lower and upper bounds of the localization algorithm accuracy. Any movement sensor data incorporated into the algorithm produces the algorithm variant where accuracy is within the bounds. Also, the paper presents a technique for recovering the probability density function of distance overestimates from biased measurements and proposes relative accuracy estimate based on the least squares method. The estimate can be used instead of Cramer-Rao lower bound when there is no analytical probability density function. © 2014 Elsevier B.V. All rights reserved.
Bogoiavlenskaia O.,Petrozavodsk State University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015
This paper investigates discrete random process describing behavior of the Additive Increase Multiplicative Decrease algorithm of networking Transmission Control Protocol (TCP). We use the sequence of TCP rounds with no data loss events to define the end-to-end path data loss behavior. The Markov chain embedded in the random process is described and the theorem on its ergodic property is proved. Further analysis yields the estimates of stationary first and second moments of the congestion window size which are key performance metrics of TCP protocol. © Springer International Publishing Switzerland 2015.
Meigal A.,Petrozavodsk State University
Pathophysiology | Year: 2012
The condition of simulated or real manned spaceflight, i.e. thermally comfortable microgravitation (G∼ 0), is very similar to the intrauterine immersion to the amniotic fluid. Domination of fast muscle fibers and phasic movements forms the fetal strategy to survive in heating, strongly hypoxic, albeit normal for fetus, immersion. In adults, the adaptive response separately to microgravitation, heat stress and hypoxia also shifts muscle fiber properties to faster values. That allows to speculate about specific motor strategy induced by micro-or hypogravitation (fetal/. microgravitation, or FM-strategy).After birth the newborn is subjected to a combined 'sensory attack' of Earth gravitation, cooler ambient temperature and normoxia which is actually hyperoxic for fetus. The process of parturition can be considered as equivalent to cosmonaut's/astronaut's transition from microgravitation back to Earth gravitation (G= 1) during landing. These factors also act simultaneously and constitute another set of sensory inputs with the effect that is opposite to the intrauterine condition. In normal gravitation, comfortable temperature and normoxia decreases the motor unit activity (MU) firing rate to a level, characteristic for the regular Earth condition. In contrast to 'faster' fetal adaptive motor response (microgravitation, heat, hypoxia), the post-natal adult set of conditions (lower, but still normal temperature, normoxia, 1. G gravitation, healthy maturation) may represent the 'Earth' adaptive motor response, or the (gravitation/. Earth, or GE-strategy). The motor system undergoes a second profound remodeling in older people during healthy ageing that results in further domination of slow muscle fibers and slowing down motor unit activity, simulating the condition of hypergravitation (G> 1). Similar slowing adaptive responses are represented by cold and hyperoxia thus forming further motor strategy that could be named as SJ-strategy (after 'slow' and Jupiter - the most massive planet and the only planet with G> 1 in the solar system).These strategies suppose that definite sensory inputs and conditions may substitute each other due to its equivalent action on the motor system. Thus, cold 'sensory attack' may serve as a 'surrogate' for gravitation because these two conditions exert equivalent stimulating action on muscle tone. In that respect long-term mild cooling exposures or shorter severe cold exposures may be considered as a prophylactic countermeasure against hazardous action of weightlessness. Also, combination of cooling sensory intervention with traditional and well- documented interventions (whole body vibration and stimulation of 'support zone' afferents) may elevate their anti-microgravitation efficiency. © 2012 Elsevier Ireland Ltd.
Vinogradova I.,Petrozavodsk State University |
Anisimov V.,Nn Petrov Research Institute Of Oncology
Biogerontology | Year: 2013
Effect of light regimens (standard 12:12 light/dark, constant light, natural lightning of the north-west of Russia) and that of melatonin on the development of metabolic syndrome during aging of rats was studied. It was found out that during the process of aging of rats kept in the conditions of the broken rhythm of day and night, different disturbances of metabolism in the form of abdominal obesity, hyperinsulinemia, hypercholesterolemia, hyperglycemia, hyperbetalipoproteinemia and glycosuria occurred. These disturbances can be considered to be metabolic syndrome or the syndrome of insulin resistance. The use of melatonin at night time starting in the rats of 4 month old allowed to decrease the age metabolism disorders in the rats. This fact indirectly proves the insufficiency of this hormone in human in the conditions of natural lighting of the north-west of Russia. © 2013 Springer Science+Business Media Dordrecht.