Deep neural networks performance optimization in image recognition

In this paper, we consider the problem of insufficient runtime and memory-space complexities of contemporary deep convolutional neural networks in the problem of image recognition. A survey of recent compression methods and efficient neural networks architectures is provided. The experimental study is focused on the visual emotion recognition problem. We compare the computational speed and memory consumption during the training and the inference stages of such methods as the weights matrix decomposition, binarization and hashing in the visual emotion recognition problem. It is experimentally shown that the most efficient recognition is achieved with the full network binarization and matrices decomposition.The article was prepared within the framework of the Academic Fund Program at the National Research University Higher School of Economics (HSE) in 2017 (grant №17-05-0007) and by the Russian Academic Excellence Project "5-100". A.V. Savchenko is supported by Russian Federation President grant no. МД-306.2017.9

The Synthesis of Metalcarbon Nanocomposite Ni / C on the Basis of Polyacrylonitrile

Metalcarbon nanocomposites based on polyacrylonitrile and nickel chloride are synthesized under the influence of infrared heat. The resulting materials represent a system of carbon matrix formed during the carbonization of PAN, and distributed in it nickel nanoparticles. The average size of the nanoparticles in the nanocomposite was 15-25 nm. It was found that the distribution of nickel nanoparticles sizes is determined by temperature synthesis nanocomposite. Thus with increasing temperature, the predominant average particle size of the metal increases, and the distribution is spread and shifted toward larger sizes. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3360

ХЕМИЛЮМИНЕСЦЕНТНАЯ И ЭНЗИМАТИЧЕСКАЯ АКТИВНОСТЬ НЕЙТРОФИЛЬНЫХ ГРАНУЛОЦИТОВ У БОЛЬНЫХ РАСПРОСТРАНЕННЫМ ГНОЙНЫМ ПЕРИТОНИТОМ В ЗАВИСИМОСТИ ОТ ИСХОДА ЗАБОЛЕВАНИЯ

Background: Aim was to study the chemiluminescent activity and the activity of NAD- and NADP-dependent dehydrogenases of neutrophilsdepending on the outcome of the widespread purulent peritonitis (WPP). Patients and methods: 51 patients with a mean age of RSE 54,2±19,2 years were observed. As a control 75 healthy people of similar age range were examined. Lucigenin- and luminol-dependent chemiluminescence activity and activity of NAD(P)-dependent dehydrogenases peripheral blood neutrophils were studied. Results: In patients with a favorable outcome of WPP the maximum intensity increased and the magnitude of the activation index of lucigenine-dependent spontaneous chemiluminescence reduced.Regardless to the outcome of WPP in patients with increased activation index and maxima of the luminol-dependent spontaneous and zymosaninduced chemiluminescence. At the unfavorable outcome of the disease in neutrophils NAD- dependent isositrate dehydrogenase and anaerobic lactate dehydrogenase reaction activity increased. Regardless to the outcome WPP in patients neutrophils aerobic reaction of lactate dehydrogenase, glucose-6-phosphate dehydrogenase and NADP-dependent glutamate dehydrogenase activity reduced but levels of NADH-dependent reaction of malate dehydrogenase, NADH-dependent glutamate dehydrogenase and NADP-dependent isocitrate dehydrogenase activity increased. Conclusion: With the reduction of the intensity of plastic processes and imbalances enzymatic activity in nitrogen metabolism in patients with WPP at unfavorable outcome of the disease increases the activity of enzymes that characterize the level of anaerobic and aerobic respiration. In the absence of marked changes in the activity of enzymes that characterize the level of energy processes in cells of patients with favorable outcome of the WPP, increases the intensity of spontaneous lucigenin-dependent chemiluminescence and reduced neutrophil activation index.Цель исследования: изучить хемилюминесцентную активность и активность НАД- и НАДФ-зависимых дегидрогеназ нейтрофильных гранулоцитов в зависимости от исхода распространенного гнойного перитонита (РГП). Пациенты и методы: обследован 51 больной РГП (средний возраст 54,2±19,2 года). В качестве контроля обследовано 75 здоровых людей аналогичного возрастного диапазона. Изучены показатели люцигенин- и люминолзависимой хемилюминесцентной активности и уровни активности НАДФ-зависимых дегидрогеназ нейтрофильных гранулоцитов периферической крови. Результаты: у больных с благоприятным исходом РГП повышается максимальная интенсивность и снижена величина индекса активации люцигенинзависимой спонтанной хемилюминесценции. Независимо от исхода РГП у больных повышаются индекс активации и максимумы интенсивности люминолзависимой спонтанной и зимозаниндуцированной хемилюминесценции. При неблагоприятном исходе заболевания в нейтрофилах повышена активность НАД-зависимой изоцитратдегидрогеназы и анаэробной реакции лактатдегидрогеназы. Вне зависимости от исхода РГП в нейтрофильных гранулоцитах больных снижена активность аэробной реакции лактатдегидрогеназы, глюкозо-6-фосфатдегидрогеназы и НАДФ-зависимой глутаматдегидрогеназы, но повышены уровни активности НАДН-зависимой реакции малатдегидрогеназы, НАДН-зависимой глутаматдегидрогеназы и НАДФ-зависимой изоцитратдегидрогеназы. Выводы: на фоне снижения интенсивности пластических процессов и дисбаланса ферментативной активности в азотистом обмене у больных РГП при неблагоприятном исходе заболевания повышается активность ферментов, характеризующих уровень анаэробного и аэробного дыхания. При отсутствии выраженных изменений активности ферментов, характеризующих уровень энергетических процессов в клетках у больных РГП при благоприятном исходе заболевания, повышается интенсивность спонтанной люцигенинзависимой хемилюминесценции и снижается индекс активации нейтрофилов

The Structure and Magnetic Properties Metal-carbon Nanocomposites NiCo / C on Based of Polyacrylonitrile

By method of IR-pyrolysis the precursor of polyacrylonitrile and compounds of cobalt and nickel metal-carbon nanocomposites were obtained, representing nanoparticles of alloy NiCo, dispersed in nanocrystal-line carbon matrix. Identification of alloy nanoparticles was carried out by the values of the lattice param e-ter, which was determined by X-ray analysis and was 0,3533 nm (values of the lattice parameter for Ni 0,3529 nm), this corresponds intermetallics Ni0,5Co0,5. By XRD analysis it was determined that an increase in the synthesis temperature of 500 to 800 ºC leads to increase in average size of coherent dissipation of crystallite metal phase. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3632

Features of Formation of the Nanoparticles of Alloys in Metal-carbon Nanocomposites FeCo / C and NiCo / C on Based Polyacrylonitrile

By the method of IR-heating the precursor on base of polyacrylonitrile, compounds of iron, cobalt and nickel metal-carbon nanocomposites were obtained, representing an ensemble of nanoparticles of intermetallic FeCo (NiCo), dispersed in nanocrystalline carbon matrix. XRD analysis revealed that the carbon structure of the PAN-based matrix changed from amorphous to nanocrystalline at the processing temperatures in the range 200-700 °C. Thus there is a reduction of metals from compounds released by degradation of the polymer with hydro-gen. FeCo alloy nanoparticles formed at synthesis temperatures T≥500 °C, in the case of nanocomposites Ni-Co / C alloy nanoparticle formation is possible at T ≥ 270 °C, which is associated with a lower temperature com-pared to the recovery of nickel from iron. According to the results of TGA and DSC found that metals are capable of initiating the chemical transformation in the PAN, resulting in reduction start temperature degradation. Ac-cording to the results of DSC revealed that the formation of nanoparticles is accompanied by release of heat due to exothermic processes occurring in the nanocomposites. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3631

Stimulated by laser light exoelectron emission from solid Ar pre-irradiated by an electron beam

Spatially separated stable charge centers, self-trapped holes and trapped electrons, were generated in Ar cryocrystals by a low-energy electron beam. A combination of the cathodoluminescence (CL) and photon- stimulated exoelectron emission (PSEE) methods was used to monitor center formation and selected relaxation channel – exoelectron emission. It was found that photon-promoted electron current decreased exponentially under irradiation with the laser operating in the visible range. Influence of the laser parameters (power and wavelength) on the characteristic lifetime of exoelectron emission is discussed. Effective bleaching of the low-temperature peaks of thermally stimulated exoelectron emission by the laser light in a visible range was observed

Oxygen-driven relaxation processes in pre-irradiated Ar cryocrystals

Relaxation processes in oxygen-containing Ar cryocrystals pre-irradiated by low-energy electrons are studied with the focus on the role of diffusion controlled atom-atom recombination reaction of oxygen in the relaxation cascades. The results of correlated in real time measurements of thermally stimulated phenomena are presented. The experiments have been performed using activation spectroscopy methods — thermally stimulated exoelectron emission and spectrally resolved thermally stimulated luminescence. Solid evidence of the radiative mechanism of electron detrapping triggering the relaxation cascades is obtained

Formation of the Microcrystalline Structure in LiNbO3 Thin Films by Pulsed Light Annealing

LiNbO3 thin films with a thickness of 200 nm were deposited onto Al2O3 substrate by RF-magnetron sputtering technique without intentional substrate heating. The results demonstrate that post-growth infrared pulsed light annealing of the amorphous LiNbO3 films leads to the formation of two phases, LiNbO3 and LiNb3O8. After annealing at temperatures of 700 to 800 °C, the percentage of the nonferroelectric phase LiNb3O8 was minimal. The surface composition of the films annealed at different temperatures was examined by X-ray photoelectron spectroscopy. Piezoresponse force microscopy was used to study both the vertical and the lateral polarization and to visualize the piezoelectric inactivity of LiNb3O8 grains. A comparison of the results of PFM and XPS measurements revealed that there is a correlation between the fraction of the piezoelectric phase and the film composition: At an annealing temperature higher than 850 °C, the atomic ratio of lithium to niobium decreases compared to the initial value along with a decrease of the fraction of the piezoelectric phase