The article discusses the challenges of real-time data processing and analyzes various methods used to solve them, with a focus on image processing. It points out the limitations of existing methods and argues for the need to use more effective and modern technologies, proposing parallel-hierarchical networks as a promising solution. The article provides a detailed description of the structural-functional model of this type of network, which involves cyclically transforming the input data matrix using a "common part" criterion and an array evolution operator until a set of individual elements is formed. The proposed model is expected to improve real-time image recognition and can potentially be applied to other fields by using the "common part" criterion.
KEYWORDS: Arteries, Blood circulation, Simulation of CCA and DLA aggregates, Image segmentation, Angiography, Independent component analysis, Visualization, Data modeling, Blood
The evaluation of blood flow indicators in the elimination of nosebleeds by ligation of the external carotid artery according to angiography data is considered. It has been shown that due to the ligation of one main vessel, which leads to an increase in the perfusion rate, respectively, with a subsequent decrease in pressure on the walls of the vessels, hypotension is observed. This reduction in pressure additionally leads to easier relief of nosebleeds in the presence of relatively small erosive or destructive changes in the vessels of the nasal cavity, which are also supplied by the internal carotid artery, and not just the external one. The result obtained means that when the external carotid artery is ligated (temporarily excluded from the circulatory system), the static blood pressure on the walls in the internal carotid artery (due to a decrease in the diameter of its cross section and an increase in the linear velocity of blood flow in it at a constant blood volume flow) decreases within 3÷15%. Accurate personalized values of blood flow parameters for the model can be obtained using additional research methods, such as Doppler imaging. It is also possible to refine the model by taking into account the current pressure in the norm with parallel blood flow in two (external and internal) carotid arteries, although this refinement will be insignificant. This allows, on the basis of a simple model, to carry out planning for stopping nosebleeds, based on the data of biophysical modeling of the mechanics of blood circulation. The perspective of the work is the refinement of the model by CFD methods and the use of telemedicine services for remote consultation and planning for the relief of profuse nosebleeds. Based on the foregoing, it can be concluded that ligation of the external carotid artery in recurrent profuse nosebleeds, regardless of the systemic blood supply, has not lost its significance to date and remains relevant as a method of effectively eliminating this formidable pathological process. Key words: optical visualization blood pressure, human health, arteries, nosebleeds, model.
A mobile robot has been developed to monitor the state of the atmosphere and phyto-condition in protected ground facilities to form control strategies that maximize production profits. The free and open ROS (Robot Operating System) software shell was used as a basis for building a mobile robot information system. The paper considers a non-contact method of assessing the condition of plants (formation of the number of flowers in the inflorescence, the number of fruits per branch, average weight and ripeness of the fruit, fruit weight gain) using wavelet analysis, during which each image obtained with a video camera located on a mobile robot, decomposes into wave functions. The training on the accumulation of experience of trial and error of the route by the robot was conducted and it was determined that with the accumulation of experience the number of unsuccessful attempts and time of the route decreases, while the number of received incentives increases.
The paper deals with a design method of multi-order diffractive intraocular lenses (IOL) that we have developed in order to correct chromatic aberration. It is shown that in order to prevent a color halo around the focused image the phasematching number is selected to attend at each point of the image three color components to get quality image. A computer simulation of multi-order diffractive lens (MODL) in a schematic model of the human eye was carried out. The calculated MODL focuses white light into a segment on an optical axis with high diffractive efficiency. More research needed to study an aberration analysis of lenses of this type.
The influence of metabolic, molecular genetic- and immune-inflammatory factors on the course of reparative osteogenesis and the formation of bone nonunion of long bones is investigated on the basis of computer statistical analysis and forecasting methods. It has been established that hyperhomocysteinemia, dyslipidemia and cytokine imbalance are negative regressors of the structural and functional state of bone tissue, leading to increased levels of bone resorption markers and the development of systemic and local osteoporosis. The genetic determinants of the course of reparative osteogenesis in a hypoplastic and atrophic type are the homozygous carrier of mutations MTHFR C677T or eNOS T786S, as well as a combination of both polymorphisms.
The paper studies a frequency transducer of the gas concentration for detection of Helicobacter Pylori strains based on the MOSFET-bipolar transistor structure with a negative differential resistance and a highly sensitive NH3 sensor. A dynamic mathematical model of the frequency transducer of gas concentration has been developed using the state variable method which makes it possible to determinate the value of voltage or current at any point of the circuit at any particular time when the gas concentration is changed. Analytical expressions for transfer function and sensitivity equation have been obtained on the basis of the nonlinear equivalent circuit of the frequency gas concentration transducer. Sensitivity of the developed device for detecting Helicobacter Pylori strains is from 2.1 kHz/ppm to 3.4 kHz/ppm.
Method of structural-functional organization of high speed buffer devices on the base of push-pull current amplifiers is considered. The importance and practical expediency of the creation of such types of voltage buffers for obtaining the low error of linearity and high operation speed is substantiated. Push-pull voltage buffers with the input amplifying stages and input current compensation are considered and analyzed. Analytical relations, describing static transfer characteristic, taking into account the circuit core parameters, are given. The components, leading to the linearity error occurrence are determined, ways of its reduction are shown. Voltage buffers with the decreased output resistance are suggested, for this purpose, push pull DC amplifiers are additionally introduced in the circuit, they have profound negative feedback. Computer simulation of the static and dynamic characteristics of the suggested schemes of the voltage buffers has been carried out, the comparative analysis of the results obtained has been performed, the possibility of the construction of high speed buffer devices on the base of push pull current amplifiers has been proved.
One of the aims of the given research is realization of one of possible variants of the solution of the problem of efficient integration of high-level information in low-level image presentation. The result of this integration is high efficiency of recognition. The advantage of such recognition is compact description of object image that considers reduced size of database and more fast-acting realization of processing. For solution of above-mentioned problems, the creation of common methodological basis for synthesis of simple computational algorithm of image preprocessing with their segmentation and formalized procedures of separate parts description with high adaptive ability on the basis of the ideas of algebraic approach to recognition problems is very actual.
The article is devoted to the development and justification of parallel numerical simulation methods. Results can be obtained to calculate the number of points. To increase the order of approximation of the developed methods, the set of points of the reference block (s) is introduced into difference schemes. Generation of difference schemes for any reference and calculated points is considered. For some block sizes, generated differential calculation schemes are obtained, oriented to the number of available processes in a parallel implementation. The absolute stability of the constructed multi-step multipoint methods according to the initial conditions and the right side is proved.
The paper presents a new sharpening method that can be applied for the low-contrast medical images as well as general
edge detection. The method provides more reliable diagnosis of the vascular system based on image processing. The new
contouring method was compared with Sobel, low-frequency filtration and Canny edge detection methods on the
example images with micro-capillaries.
In paper the concept of interaction of cholesteric liquid crystals (CLC) with creatinine and urea to designing the active medium material for optical sensor of biological substances are presented. It is shown that there is a general tendency to reduce the pitch of supramolecular helical structure versus of increasing of concentrations of aqueous solutions for all investigated substances. A decision to designing the scheme of signal converter of optical sensors with frequency selection is proposed. In basis of the proposed decision is impedance converter provided the inductive nature of the impedance circle of load photodiode and therefore suppressing of direct component of the photocurrent.
Transformations of geometric objects are described for offsetting. Free forms based on the perturbation functions have an advantage of spline representation of surfaces, that is, a high degree of smoothness, and an advantage of arbitrary form for a small number of perturbation functions.
In the paper we explored the possibility of monitoring oxygenation of the tumor tissue through the registration of light diffuse reflectance. This method can also be helpful for assessment the effectiveness of PDT, defining the level of vascular damage and the degree of the tumor oxygenation. We also propose the modification of PDT procedure by using a modulated laser that enables to better maintain the necessary parameters for the PS activation and oxygen generation in irradiated tissues simultaneously allowing to reduce the light dose required for tumor treatment.
To understand and evaluate the Optical Layer, and how it will affect the IP protocols over WDM (Switching), the present analyse is proposed. Optical communications have attractive proprieties, but also have some disadvantages, so the challenge is to combine the best of both branches. In this paper, general concepts for different options of switching are reviewed as: optical burst switching (OBS) and automatically switching optical network (ASON). Specific details such as their architectures are also discussed. In addition, the relevant characteristics of each variation for switching are reviewed.
The paper deals with a problem of insufficient productivity of existing computer means for large image processing, which do not meet modern requirements posed by resource-intensive computing tasks of laser beam profiling. The research concentrated on one of the profiling problems, namely, real-time processing of spot images of the laser beam profile. Development of a theory of parallel-hierarchic transformation allowed to produce models for high-performance parallel-hierarchical processes, as well as algorithms and software for their implementation based on the GPU-oriented architecture using GPGPU technologies. The analyzed performance of suggested computerized tools for processing and classification of laser beam profile images allows to perform real-time processing of dynamic images of various sizes.
The findings have been expounded of the theoretical research aimed at the disclosure of the precise impact of the wear of the mechanical classifier spiral's working parts on the measurement accuracy of the amount of sand in the inter-turn space based on the sand body height. It has been demonstrated that the wear of the spiral's working parts affects both the amount of sand at a certain value of the height of its body and the measurement accuracy of the height itself, with the measurement conducted by the locating method. At a certain constant height of the sand body, less sand is accommodated in the spiral inter-turn space when the operational wear of the working parts is observed, and that “less” can amount to up to 30%. As a result of the working parts' allowable operational wear, the sand body height measurement vertical line coordinates change leading to a relative systemic error, which can reach 20%. That does not make it possible to directly measure the amount of sand in the inter-turn space based on the height of the sand body. The approaches developed make it possible to neutralize the relative sand body height measurement error and to ensure the determination of the amount of sand based on the height of its body with an error not exceeding the process requirements for that parameter's monitoring accuracy.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.