Proceedings of the Southwest State University最新文献

{"title":"Mathematical Modeling of Human Gait in a Rehabilitation Exoskeleton Using Gait Video Analysis Method","authors":"A. Pechurin, A. V. Fedorov, A. Yatsun, S. Jatsun","doi":"10.21869/2223-1560-2021-25-3-27-40","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-3-27-40","url":null,"abstract":"Purpose of research One of the ways to increase effectiveness of rehabilitation systems for patients with musculoskeletal disorders is the use of exoskeletons, which make it possible to ensure lower limbs movement according to the laws close to natural gait set by the rehabilitation therapist. The article considers a method based on construction of ankle joint motion trajectories (AJ) followed by synchronous determination of rotation angles of lower limb links based on numerical solution of inverse kinematics problem. It is known that the use of simplified laws of ancle joint movement and feet without taking into account anthropometric parameters of a patient leads to the formation of an incorrect gait and, as a result, a significant increase in rehabilitation time of a patient. Therefore, when constructing mathematical model of ankle motion patterns, it is proposed to use the method of video capture of marker points selected on AJ and foot, followed by processing and approximation of received signals using polynomials, which provides high accuracy of reproducing motion patterns. Purpose of research is to build motion laws of exoskeleton links along the trajectory of AJ motion based on a numerical solution of inverse kinematics problem.Methods. Experimental walking studies with the construction of AJ motion trajectory based on video fragment, smoothing and approximation of this trajectory and solving reverse kinematics problem are used to achive this goal.Results. Method for construction and processing of foot motion trajectory and finding kinematic characteristics of links motion for creation of exoskeleton motion patterns in gait is introduced.Conclusion. Simulation results shows that proposed methods of constructing motion trajectory and gait modeling of the exoskeleton make it possible to copy the gait of a person with high accuracy in rehabilitation process.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133920027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Composition of Classification Models for Recognizing the Flow Velocity of Liquids in Capillaries","authors":"E. Kornaeva, I. Stebakov, D. Stavtsev, V. Dremin, A. Kornaev","doi":"10.21869/2223-1560-2021-25-2-93-106","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-2-93-106","url":null,"abstract":"Purpose of research. Development of a technique for estimating the average flow rate of physiological fluids in capillaries from images obtained using laser speckle-contrast imaging. The technique includes obtaining experimental data in the form of an image of the fluid flow in a thin tube, their preliminary processing, including filtering and compressing data, as well as training and testing approximate models using modern machine learning methods.Methods. The experimental study of the fluid flow in the tube is based on the application of the laser speckle-contrast imaging method. The spatial speckle-contrast values are calculated from the obtained images. The obtained data are subjected to preliminary processing, including the data filtering out and extending to a steady flow mode, as well as compressing the obtained images using the principal component method, which allows reducing the dimension of the feature space. The problem of predicting the average velocity from the image of the fluid flow is solved as a classification problem based on the composition of decision trees constructed through the bagging procedure, as well as in the form of a random forest.Results. A technique for predicting the average velocity of liquid flow in a capillary from images obtained using the laser speckle-contrast imaging method has been developed. The accuracy of predicting the average velocity (or flow rate) based on the training sample was about 91%, on the validation and test samples - at least 81.5%.Conclusion. Based on the developed technique, it is planned to determine the kinematic characteristics of the parameters of physiological fluids flow, which will improve the inertial method of measuring the viscosity of the tested liquids developed earlier by the authors, getting rid of a number of assumptions about the velocity profile.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130366567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a Neural Model of a Semiconductor Gas Sensor","authors":"O. Bondar’, E. O. Brezhneva, K. Andreev, N. V. Polyakov","doi":"10.21869/2223-1560-2021-25-2-123-139","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-2-123-139","url":null,"abstract":"Purpose of research: Development of a neural model of a semiconductor gas sensor in order to generate data for training an information-processing device of gas analyzers based on artificial neural networks (ANN). Search and optimization of cleaning data composition and volume. The neural model of the sensor should take into account the influence of those factors on the signal, the fluctuations of which make the maximum contribution to the measurement errors. Testing of the model based on semiconductor carbon monoxide and hydrogen sensors.Methods. Methods of computer modeling, numerical methods, theory of neural networks. To compare the simulation results and the responses of real sensors, the relative error and standard deviation were determined.Results. Studies of various structures of the neural model of a semiconductor sensor have been carried out, the structure of a multilayer neural network of direct propagation for two semiconductor carbon monoxide and hydrogen sensors has been selected, modeling errors have been estimated, recommendations have been given for choosing the optimal structure and the amount of training data.Conclusion. Neural models of semiconductor carbon monoxide and hydrogen sensors have been obtained, conclusions have been drawn about the possibility of using this ANN structure in solving typical problems. Based on the analysis of the errors obtained, the effectiveness of using neural models of sensors to generate training data has been shown. The maximum relative error of modeling the TGS2442 semiconductor carbon monoxide sensor did not exceed 5% for the main characteristic and 2% for additional ones. The maximum relative error of modeling of the TGS2442 semiconductor hydrogen sensor did not exceed 3% for the main characteristic and 1% for additional ones.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121657250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Landfill Gas as an Alternative Energy Source","authors":"R. Ramazanov","doi":"10.21869/2223-1560-2021-25-2-23-34","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-2-23-34","url":null,"abstract":"Purpose of research. With the increase of population and number of megacities, the consumption of various goods increases and the waste of which eventually turns into garbage. The growing amount of all kinds of waste every year and their negative impact on the environment is a global problem. However, with all existing methods of waste disposal, the least environmentally friendly method of waste disposal is used in our country - disposal by means of burial ground disposal at solid waste landfills. Landfills of solid waste are a source of landfill gas, the uncontrolled emissions of which have a negative impact on the environment. At the same time, the properties of landfill gas make it possible to use it as an energy source. The analysis of the problems рфму showт the relevance of the direction of using landfill gas as an alternative type of gas fuel, as well as the development of devices for its efficient combustion.Methods. The article discusses the impact of solid domestic waste (MSW) on the Earth's biosphere. The analysis of the global problem of waste disposal is carried out, solutions are considered. Based on the methodology specified in GOST 33998-2016 “Gas household appliances for cooking. General technical requirements, test methods and rational use of energy ”, we have carried out a study of the efficiency of the landfill gas combustion process in the developed design of a gas burner device equipped with a thermal splitter.Results. On the basis of experimental studies for a gas burner device of the developed design, the values of efficiency,% of the burner and the content of carbon monoxide (CO, mg / m3) in the combustion products have been obtained, depending on the length of the thermal divider.Conclusion. The results of experimental studies have shown the high efficiency of the original gas burner device when burning landfill gas.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130426869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of Deformations of Pre-Stressed Steel Trusses in Emergency Situations","authors":"I. Serpik, N. Tarasova","doi":"10.21869/2223-1560-2021-25-2-35-50","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-2-35-50","url":null,"abstract":"Purpose of research is to make methodology and algorithm for finite element modeling in a single computational scheme of deformation of flat steel trusses, previously stressed using high-strength ropes, in accordance with the chronology of impacts on the object in the form of prestresses, normative loads and emergency destruction of one of the bearing elements.Methods. The solution of the problem is carried out in geometrically nonlinear staging using numerical integration based on Newmark approach with the construction of equilibrium equations of the finite element model of the structure in a deformed state at each integration step. Structural nonlinearity related to structural restructuring and consideration of ropes operation for tension only is described. The application of gravity forces of the carrier system, sequential introduction of tightening and their prestress, the application of payload and emergency impact in the form of instantaneous local destruction are traced. Before failure occurs, static loading condition is simulated using dynamic relaxation method. Methodology of accounting within numerical integration of emergency impact is formulated by application of dummy forces, values of which are calculated in excluded structural element before its destruction.Results. Performance of presented computational procedure is illustrated by the example of a flat steel truss calculation with a span (54 m), including two ropes. Object behavior is considered considering the break of one of the ropes subjected to preliminary stress. It was revealed that the investigated emergency does not lead to the destruction of the second rope and the occurrence of plastic deformations in the truss rods.Conclusion: Completed developments can be used to ensure the survivability of pre-stressed steel trusses under beyond design basis effects, leading to the destruction of individual structural elements.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123835868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On Two-Frequency Oscillations of a DC Electric Drive with Pulse Control","authors":"O. Yanochkina","doi":"10.21869/2223-1560-2021-25-2-83-92","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-2-83-92","url":null,"abstract":"Purpose of research is of the paper is to analyze bifurcations of two-frequency oscillations of a DC electric drive with pulse-width control.Methods. The research is based on the construction of a stroboscopic Poincare map, the calculation of saddle periodic orbits and their stable and unstable invariant manifolds.Results. The study of the mechanisms of the occurrence of two-frequency oscillations from a periodic motion that loses stability in a DC electric drive with pulse-width control was carried out. A non-local saddle-node bifurcation leading to resonance (synchronization) on a torus characterized by a pair of independent frequencies when their ratio becomes a rational number, was studied.Conclusion. A bifurcation analysis of the control system of a DC electric drive, the dynamics of which is described by non-smooth nonautonomous differential equations, was carried out. The research was conducted on an iterable map obtained from the specified vector field in an analytical form. It is shown that the system under consideration demonstrates two-frequency oscillations that occur through the Neimark-Sacker bifurcation. In the phase space of the discrete model, a closed invariant curve corresponds to oscillations with two independent frequencies. It is shown that if these frequencies are correlated multiply, then a resonance occurs when the dynamics becomes periodic. But at the same time, the closed curve remains invariant, and the limit points of the orbit form a pair of periodic cycles – stable and saddle, corresponding to a rational frequency ratio. A closed invariant curve is formed by unstable manifolds of a saddle cycle. If the frequency ratio is irrational, then the dynamics is quasi-periodic. The orbits of such motion fill the closed curve everywhere densely.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"666 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116183914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the Degree of Augmentation of the Mass Transfer Coefficient of the Heat Transfer Medium in a Vortex Heat Exchanger of a Gas Pressure Regulating and Metering Station Heating System","authors":"N. Grigorova, P. Monastyrev, E. Pakhomova, N. Semicheva","doi":"10.21869/2223-1560-2021-25-1-53-65","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-1-53-65","url":null,"abstract":"Purpose of research. is to investigate the degree of augmentation of the mass transfer coefficient of a heat transfer medium in contact with a \"spot\" of liquid on the surface of the vortex blade when it is bombarded with dispersed contaminants in a vortex heat exchanger in order to identify a pattern that allows obtaining design values of the heat transfer coefficient of the heat transfer medium that have the best agreement with the experimental values provided in previously published articles [4, 6, 7].Methods. A complex analysis of the degree of augmentation of the mass transfer coefficient of the heat transfer medium on the surface of the vortex blade in a vortex heat exchanger based on the known theoretical positions and equations of heat and mass transfer processes.Results. The dependence of the augmentation of the mass transfer coefficient of the heat transfer medium in contact with the \"spot\" of liquid on the surface of the vortex blade when it is bombarded with dispersed contaminants was obtained, which allows obtaining the best agreement of the design and experimental values of the heat transfer coefficient in the vortex heat exchanger of a gas pressure regulating and metering station.Conclusion. The values of the heat transfer coefficient of the heat transfer medium calculated using the obtained dependence of the augmentation of the mass transfer coefficient of the heat transfer medium have a satisfactory convergence with the experimental data, which allows us to use this dependence in engineering calculations of the design parameters of the vortex heat exchanger used as a heat exchanger for the heating system of the working area of the gas pressure regulating and metering station. This technical solution allows not only saving natural gas as a source of heat generation, but also reducing the negative impact on the environment, since there is no need to burn natural gas. In this case, the production of thermal energy is carried out due to a regulated pressure drop of natural gas coming from the main line to consumers.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124010186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Automated Leadership Selection Educational Projects Based on Genetic Algorithms","authors":"E. Kovshov, V. Kuvshinnikov, L. Osipenko","doi":"10.21869/2223-1560-2021-25-1-162-180","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-1-162-180","url":null,"abstract":"Purpose or research. The purpose of the study is to conduct a research of the possibility to use automated methods of finding a solution for the task of forming a selection of candidates in solving a wide range of business problems with the possibility of the influence of such factors as: requirements for the quality of business processes, restrictions on the competence of candidates, the employment of candidates in other processes of the company, planned urgency of fulfilling tasks, the amount of tasks in the pool and expected tasks, tasks characteristics, private policy of the company when selecting candidates, company's policy on risks.Methods. A typology of innovative business tasks is given by the subject area, the range of target results, the duration of execution, etc. External and internal factors are considered to ensure the effective operation of the project team and the success of the project. There are offered sets of attributive characteristics for assessment of projects quality and potential projects. The structure of the algorithm for solving the problem of creating a selection of candidates for solving a set of problems is considered. Prerequisites for using principles of genetic programming in solving the problem under consideration are given. Search algorithm implementation parameters, criteria and constraints are defined. Algorithm was implemented as well as modeling in the Jupyter Lab v2 environment. The results are described in the text. A relative analysis of practical effectiveness of the algorithm was carried out depending on the modeling parameters to justify the selection of their values.Results. The task of creating a selection of candidates for the implementation of projects pool considering a number of factors was described during the study. An approach to solving the problem based on a genetic heuristic search algorithm has been developed. A numerical simulation was performed in Jupyter Lab v2. Simulation results were analyzed, and algorithm parameters were selected.Conclusion. The proposed approach allows not only automatize the selection of managers based on the accumulated data history, but also to adjust the established process to change the vector of organization development. The interaction of education and informatics (information technology) can enrich and expand the field of both sciences in the field of recruitment of innovative project teams. Their object analysis, supplemented by genetic programming capabilities, together allows you to achieve specified qualities of the head of innovative project teams that help maximize business benefits while minimizing material costs. As a result of computational experiments using mathematical apparatus and genetic algorithm technologies, it is necessary to emphasize the possibility of extrapolating such approaches to any level of implementation of innovative projects.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134437627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and Parameterization of Gas Sensor Models","authors":"O. Bondar’, E. O. Brezhneva, O. Dobroserdov, K. Andreev, N. Polyakov","doi":"10.21869/2223-1560-2021-25-1-138-161","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-1-138-161","url":null,"abstract":"Purpose of research: search and analysis of existing models of gas-sensitive sensors. Development of mathematical models of gas-sensitive sensors of various types (semiconductor, thermocatalytic, optical, electrochemical) for their subsequent use in the training of artificial neural networks (INS). Investigation of main physicochemical patterns underlying the principles of sensor operation, consideration of the influence of environmental factors and cross-sensitivity on the sensor output signal. Comparison of simulation results with actual characteristics produced by the sensor industry. The concept of creating mathematical models is described. Their parameterization, research and assessment of adequacy are carried out.Methods. Numerical methods, computer modeling methods, electrical circuit theory, the theory of chemosorption and heterogeneous catalysis, the Freundlich and Langmuir equations, the Buger-Lambert-Behr law, the foundations of electrochemistry were used in creating mathematical models. Standard deviation (MSE) and relative error were calculated to assess the adequacy of the models.Results. The concept of creating mathematical models of sensors based on physicochemical patterns is described. This concept allows the process of data generation for training artificial neural networks used in multi-component gas analyzers for the purpose of joint information processing to be automated. Models of semiconductor, thermocatalytic, optical and electrochemical sensors were obtained and upgraded, considering the influence of additional factors on the sensor signal. Parameterization and assessment of adequacy and extrapolation properties of models by graphical dependencies presented in technical documentation of sensors were carried out. Errors (relative and RMS) of discrepancy of real data and results of simulation of gas-sensitive sensors by basic parameters are determined. The standard error of reproduction of the main characteristics of the sensors did not exceed 0.5%.Conclusion. Multivariable mathematical models of gas-sensitive sensors are synthesized, considering the influence of main gas and external factors (pressure, temperature, humidity, cross-sensitivity) on the output signal and allowing to generate training data for sensors of various types.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132349719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recognition of character information for automation of production processes","authors":"V. Panishchev, M. I. Trufanov, O. Dobroserdov, O. O. Khomyakov","doi":"10.21869/2223-1560-2021-25-1-122-137","DOIUrl":"https://doi.org/10.21869/2223-1560-2021-25-1-122-137","url":null,"abstract":"Purpose of research. Nowadays optical character recognition systems have a high level of dependence on the specific type of marking that is to be recognized, and therefore, the creation of a universal solution is an important and difficult task. The paper considers the issue of creating a system for recognizing symbolic information that can be used at various stages of production to automate processes in control systems, in particular, to analyze the labeling of circuit breakers.Methods. Binarization, filtering, and boundary detection are digital image processing techniques. Line search method, baseline search method, word splitting algorithms, image enhancement methods by segmentation, damaged characters recognition method, an algorithm for increasing the final recognition quality are character recognition methods.Results. The analysis of algorithms used for preprocessing and subsequent recognition of images containing marking of circuit breakers is carried out. The mathematical model of image processing for subsequent recognition has been created. We have described methods used to define marking symbols. Illustrative examples of the operation of the algorithms on which the system is built are given. The obtained solution was tested. The ways of system development are described here, they can lead to improved results, for particular use cases.Conclusion. It is proposed a solution that recognizes symbolic information on the labeling of circuit breakers, which can be the basis for the development and description of systems serving for the automation of production, by transferring information read from the product during the production process. This system, by its example, describes the components of character recognition systems, and for direct use, it needs to be refined in accordance with the technical requirements and the specifics of the conditions in which it will be used.","PeriodicalId":443878,"journal":{"name":"Proceedings of the Southwest State University","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128822016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}