Pub Date : 2018-11-01DOI: 10.1109/DYNAMICS.2018.8601487
S. Belim, A. N. Mironenko
The problem of Roles Mining is to build a role-based security policy for large information systems based on an analysis of the set of allowed user permissions. The article presents an algorithm for analyzing the matrix of authorized user permissions for optimal role formation. A set of permissions for an individual user is treated as a transaction. As a transaction record, used authority to act on the system. After that, the algorithm of searching for associative rules for the set of authorities is applied. Only associative rules are considered, including one power as a prerequisite and one as a consequence. A graph of the relationship of authority in the given system is being constructed. This graph is oriented weighted. The weight of the arc is determined by the support of the corresponding associative rule. For the graph constructed, clustering is performed using the community search algorithm. A hierarchy of communities is being built. Powers unite in roles if they are part of the same community. The hierarchy of communities defines the hierarchy of roles. The proposed algorithm can be used both for building a role-based security policy, and for optimizing an already existing role hierarchy.
{"title":"Using the graph-theoretic approach to solving the Role Mining problem","authors":"S. Belim, A. N. Mironenko","doi":"10.1109/DYNAMICS.2018.8601487","DOIUrl":"https://doi.org/10.1109/DYNAMICS.2018.8601487","url":null,"abstract":"The problem of Roles Mining is to build a role-based security policy for large information systems based on an analysis of the set of allowed user permissions. The article presents an algorithm for analyzing the matrix of authorized user permissions for optimal role formation. A set of permissions for an individual user is treated as a transaction. As a transaction record, used authority to act on the system. After that, the algorithm of searching for associative rules for the set of authorities is applied. Only associative rules are considered, including one power as a prerequisite and one as a consequence. A graph of the relationship of authority in the given system is being constructed. This graph is oriented weighted. The weight of the arc is determined by the support of the corresponding associative rule. For the graph constructed, clustering is performed using the community search algorithm. A hierarchy of communities is being built. Powers unite in roles if they are part of the same community. The hierarchy of communities defines the hierarchy of roles. The proposed algorithm can be used both for building a role-based security policy, and for optimizing an already existing role hierarchy.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123887188","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}
Pub Date : 2018-11-01DOI: 10.1109/DYNAMICS.2018.8601418
I. V. Naguslaeva, V. Boronoyev, B. Garmaev, N. Pupysheva, V. Ompokov
In this paper, the parameters of the derivative of blood pressure signals for the waveform classification of the wrist pulse have been analyzed. The method used here shows the relationships between pulse waveforms and the amplitudes of the characteristic points of the first derivative of blood pressure signals. The algorithm considered in the paper can be used for the computerization of pulse diagnostics.
{"title":"The Classification Potentialities of a Pulse Waveform Based on its Derivative","authors":"I. V. Naguslaeva, V. Boronoyev, B. Garmaev, N. Pupysheva, V. Ompokov","doi":"10.1109/DYNAMICS.2018.8601418","DOIUrl":"https://doi.org/10.1109/DYNAMICS.2018.8601418","url":null,"abstract":"In this paper, the parameters of the derivative of blood pressure signals for the waveform classification of the wrist pulse have been analyzed. The method used here shows the relationships between pulse waveforms and the amplitudes of the characteristic points of the first derivative of blood pressure signals. The algorithm considered in the paper can be used for the computerization of pulse diagnostics.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123867784","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}
Pub Date : 2018-11-01DOI: 10.1109/DYNAMICS.2018.8601494
A. V. Leonov, G. Litvinov
The article is aimed at applicability investigation and usage efficiency comparison of the routing protocols that are applied in flying ad hoc networks (FANETs) with a view to construct a network based on a set of multirotor mini-UAVs. The performance of AODV and OLSR routing protocols is evaluated as well. The Gauss-Markov (GM) mobility model describing the movements of UAVs in search and rescue (SAR) operations and a monitoring scenario is considered. The basic tool underlying the research is NS-2 simulator.
{"title":"Simulation-Based Performance Evaluation of AODV and OLSR Routing Protocols for Monitoring and SAR Operation Scenarios in FANET with Mini-Uavs","authors":"A. V. Leonov, G. Litvinov","doi":"10.1109/DYNAMICS.2018.8601494","DOIUrl":"https://doi.org/10.1109/DYNAMICS.2018.8601494","url":null,"abstract":"The article is aimed at applicability investigation and usage efficiency comparison of the routing protocols that are applied in flying ad hoc networks (FANETs) with a view to construct a network based on a set of multirotor mini-UAVs. The performance of AODV and OLSR routing protocols is evaluated as well. The Gauss-Markov (GM) mobility model describing the movements of UAVs in search and rescue (SAR) operations and a monitoring scenario is considered. The basic tool underlying the research is NS-2 simulator.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"249 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121434581","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}
Pub Date : 2018-11-01DOI: 10.1109/DYNAMICS.2018.8601454
V. Potapov, R. Khamitov, V. Makarov, A. Gritsay, A. Florensov, Denis Tyunkov
The paper considers the method of forming a training sample for intelligent methods of predicting electricity loads based on artificial neural networks. The training sample is formed taking into account the criteria of informativeness and compactness. It is shown how much the accuracy of the forecast can be increased with the approach used.
{"title":"The Training Selection Method for Short-Term Prediction Electricity Loads with Criteria of Informativeness and Compactness","authors":"V. Potapov, R. Khamitov, V. Makarov, A. Gritsay, A. Florensov, Denis Tyunkov","doi":"10.1109/DYNAMICS.2018.8601454","DOIUrl":"https://doi.org/10.1109/DYNAMICS.2018.8601454","url":null,"abstract":"The paper considers the method of forming a training sample for intelligent methods of predicting electricity loads based on artificial neural networks. The training sample is formed taking into account the criteria of informativeness and compactness. It is shown how much the accuracy of the forecast can be increased with the approach used.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126013697","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}
Pub Date : 2018-11-01DOI: 10.1109/DYNAMICS.2018.8601469
A. A. Burym, P. V. Rysev, D. V. Rysev, V. Serdyuk, E. Sidorova
Failures of single-phase voltage transformers applied in distribution networks are investigated. The aim of the study is to determine how to comply with the operating conditions the service instruction of the voltage transformers in the cold climate regions, used protection equipment and to generate recommendations for increasing the operational reliability. To achieve the objective, problems of electric strength temperature dependence investigation, transformer oil chromatographic analysis and transformer operation modes computer simulation are solved. As a result, insulation defects of voltage transformers are identified and localized by chromatographic analysis of oil. A neural network is proposed to identify faults by partial discharge parameters. Practical recommendations are founded to increase the reliability of voltage transformer operation.
{"title":"Failure Testing of Single-Phase Voltage Transformers of Distribution Networks Due to Discharge Phenomena in Insulation","authors":"A. A. Burym, P. V. Rysev, D. V. Rysev, V. Serdyuk, E. Sidorova","doi":"10.1109/DYNAMICS.2018.8601469","DOIUrl":"https://doi.org/10.1109/DYNAMICS.2018.8601469","url":null,"abstract":"Failures of single-phase voltage transformers applied in distribution networks are investigated. The aim of the study is to determine how to comply with the operating conditions the service instruction of the voltage transformers in the cold climate regions, used protection equipment and to generate recommendations for increasing the operational reliability. To achieve the objective, problems of electric strength temperature dependence investigation, transformer oil chromatographic analysis and transformer operation modes computer simulation are solved. As a result, insulation defects of voltage transformers are identified and localized by chromatographic analysis of oil. A neural network is proposed to identify faults by partial discharge parameters. Practical recommendations are founded to increase the reliability of voltage transformer operation.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122771402","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}
Pub Date : 2018-11-01DOI: 10.1109/DYNAMICS.2018.8601491
V. Zadorozhnyi, E. B. Yudin
Two classes of graphs are considered in the article: preferential attachment graphs with linear weight function and hybrid model of Jackson-Rogers graphs. The research is carried out to find such graphs whose vertex degree distributions have power-law asymptotics with an exponent that belongs to the interval from two to three. It is established for the first time that each hybrid graph corresponds to a certain graph with a linear weight function that has exactly the same vertex degree distribution as a hybrid graph. As a result of the investigation, all graphs of the classes under consideration are revealed, which implement the desired power-law asymptotics of the studied distributions. A formula is derived that allows us to determine the value of the weight function parameter from the given value of the power asymptotics exponent. The reliability and practical significance of the obtained theoretical results are confirmed by an example of their application for graph calibration according to data on a simulated network of autonomous Internet systems.
{"title":"Construction of Growing Graphs with Given Power-Law Asymptotics of Vertex Degree Distributions","authors":"V. Zadorozhnyi, E. B. Yudin","doi":"10.1109/DYNAMICS.2018.8601491","DOIUrl":"https://doi.org/10.1109/DYNAMICS.2018.8601491","url":null,"abstract":"Two classes of graphs are considered in the article: preferential attachment graphs with linear weight function and hybrid model of Jackson-Rogers graphs. The research is carried out to find such graphs whose vertex degree distributions have power-law asymptotics with an exponent that belongs to the interval from two to three. It is established for the first time that each hybrid graph corresponds to a certain graph with a linear weight function that has exactly the same vertex degree distribution as a hybrid graph. As a result of the investigation, all graphs of the classes under consideration are revealed, which implement the desired power-law asymptotics of the studied distributions. A formula is derived that allows us to determine the value of the weight function parameter from the given value of the power asymptotics exponent. The reliability and practical significance of the obtained theoretical results are confirmed by an example of their application for graph calibration according to data on a simulated network of autonomous Internet systems.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127077872","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}
Pub Date : 2018-11-01DOI: 10.1109/DYNAMICS.2018.8601474
R. Alekhin, Y. Kubarkov
The purpose of this work is to apply the new popularity-gaining optimization method of Cuckoo search for the problem of choosing the optimal location of static thyristor compensators and the volume of reactive power compensation in the radial power system and comparison with the proven method of optimizing the particle swarm.The most widespread among all FACTS-devices received static thyristor compensators (STC). The STC monitors the voltage on the bus to which it is connected by generating or consuming reactive power.The method of cuckoo search distinguishing feature is a small number of initial conditions affecting the operation of the algorithm, which makes it more versatile than many other algorithms. Calculation of the steady-state regime for real power systems is impossible without taking into account a number of regime constraints.Calculations of the operation modes of the electric network after carrying out typical activities and analysis of the obtained data show that often used in the enterprises of the BSC to compensate the reactive power do not always give the expected result.The performed calculations made it possible to obtain an estimate of the voltage levels on the tires of final consumers. The results of such studies can find application in the development of new information and computer systems for controlling the operation modes of an electrical network with actively-adaptive elements.
{"title":"Choice of the Optimal Place of Location of Static Tiristor Compensators and Additional Generation in the Power System by The Cuckoo Searching Method","authors":"R. Alekhin, Y. Kubarkov","doi":"10.1109/DYNAMICS.2018.8601474","DOIUrl":"https://doi.org/10.1109/DYNAMICS.2018.8601474","url":null,"abstract":"The purpose of this work is to apply the new popularity-gaining optimization method of Cuckoo search for the problem of choosing the optimal location of static thyristor compensators and the volume of reactive power compensation in the radial power system and comparison with the proven method of optimizing the particle swarm.The most widespread among all FACTS-devices received static thyristor compensators (STC). The STC monitors the voltage on the bus to which it is connected by generating or consuming reactive power.The method of cuckoo search distinguishing feature is a small number of initial conditions affecting the operation of the algorithm, which makes it more versatile than many other algorithms. Calculation of the steady-state regime for real power systems is impossible without taking into account a number of regime constraints.Calculations of the operation modes of the electric network after carrying out typical activities and analysis of the obtained data show that often used in the enterprises of the BSC to compensate the reactive power do not always give the expected result.The performed calculations made it possible to obtain an estimate of the voltage levels on the tires of final consumers. The results of such studies can find application in the development of new information and computer systems for controlling the operation modes of an electrical network with actively-adaptive elements.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130986020","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}
Pub Date : 2018-11-01DOI: 10.1109/DYNAMICS.2018.8601476
N. Dudarev, S. Darovskikh, N. V. Vdovina
In this paper we describe the main stages of design and the procedure of calculating the basic parameters for three-dimensional modular microwave beamformers using the example of an amplitude-phase microwave converter. The possibility of using the modern CST Microwave Studio CAD system for calculating the electromagnetic characteristics of a three-dimensional modular amplitude-phase microwave converter is demonstrated. At the end of the article, the electrical and mass-dimensional characteristics of an amplitude-phase microwave converter of a 3D-modular and traditional (planar) designs are compared. The approach used to design the 3D-modular amplitude-phase microwave converter can also be recommended for the development of the other microwave beamformers.
本文以幅相微波变换器为例，介绍了三维模块化微波波束形成器的主要设计阶段和基本参数的计算过程。演示了利用现代CST Microwave Studio CAD系统计算三维模幅相微波变换器电磁特性的可能性。在文章的最后，比较了三维模块化和传统(平面)设计的幅相微波变换器的电学和质量尺寸特性。三维模组化幅相微波变换器的设计方法也可为其他微波波束形成器的开发提供借鉴。
{"title":"Design Fundamentals of a Three-Dimensional Modular Microwave Phase Converter","authors":"N. Dudarev, S. Darovskikh, N. V. Vdovina","doi":"10.1109/DYNAMICS.2018.8601476","DOIUrl":"https://doi.org/10.1109/DYNAMICS.2018.8601476","url":null,"abstract":"In this paper we describe the main stages of design and the procedure of calculating the basic parameters for three-dimensional modular microwave beamformers using the example of an amplitude-phase microwave converter. The possibility of using the modern CST Microwave Studio CAD system for calculating the electromagnetic characteristics of a three-dimensional modular amplitude-phase microwave converter is demonstrated. At the end of the article, the electrical and mass-dimensional characteristics of an amplitude-phase microwave converter of a 3D-modular and traditional (planar) designs are compared. The approach used to design the 3D-modular amplitude-phase microwave converter can also be recommended for the development of the other microwave beamformers.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121335066","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}
Pub Date : 2018-11-01DOI: 10.1109/DYNAMICS.2018.8601448
V. Lyubimov, V. Lashin
We consider the problem of an uncontrolled descent of a spacecraft with a small asymmetry in a low-density atmosphere with small values of the angle of attack. The aim of this study is to obtain the stability conditions for the angle of attack of a spacecraft with small mass and inertial asymmetries, descending in a low-density atmosphere. The motion of the spacecraft relative to its center of mass is described by a nonlinear low-frequency dynamical system. We linearize the low-frequency system, taking into account the small values of the angle of attack. The application of the averaging method makes it possible to substantially simplify the linearized equations and to obtain an approximate analytical stability condition for the angle of attack. The reliability of the obtained stability condition is confirmed by the results of numerical integration of the equation for the angle of attack.
{"title":"Asymptotic Analysis of the Stability of the Angle of Attack in an Atmospheric Descent of a Spacecraft with Small Mass and Inertial Asymmetries","authors":"V. Lyubimov, V. Lashin","doi":"10.1109/DYNAMICS.2018.8601448","DOIUrl":"https://doi.org/10.1109/DYNAMICS.2018.8601448","url":null,"abstract":"We consider the problem of an uncontrolled descent of a spacecraft with a small asymmetry in a low-density atmosphere with small values of the angle of attack. The aim of this study is to obtain the stability conditions for the angle of attack of a spacecraft with small mass and inertial asymmetries, descending in a low-density atmosphere. The motion of the spacecraft relative to its center of mass is described by a nonlinear low-frequency dynamical system. We linearize the low-frequency system, taking into account the small values of the angle of attack. The application of the averaging method makes it possible to substantially simplify the linearized equations and to obtain an approximate analytical stability condition for the angle of attack. The reliability of the obtained stability condition is confirmed by the results of numerical integration of the equation for the angle of attack.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128587438","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}
Pub Date : 2018-11-01DOI: 10.25206/2310-9793-2018-6-4-9-17
T. I. Belyankova, E. I. Vorovich, V. Kalinchuk, O. M. Tukodova
A problem on surface sh-waves’ propagation in a piezoelectric structure with a coating from a functionally graded material is considered. As a "base" material, a piezoelectric of 6mm class hexagonal syngony is used. The problem solution is based on the approach, which combines analytical methods of constructing the solution for homogeneous components and numerical methods of constructing the solution for inhomogeneous components of a heterogeneous structure. For problems with an electrically open or closed free surface, the transformation of the surface wave field, depending on the character of the change of the coating properties, is studied. Peculiarities of the surface waves’ behaviour at different combinations of the coating and substructure materials are investigated. It is demonstrated, that by means of a special change of the coating properties it is possible to obtain the structure, on the surface of which Love waves or Bleustein–Gulyaev waves (BGW) are propagated, or the structure in which surface waves are absent in a definite frequency range.
{"title":"Some Properties of Saw in Piezoelectric Structures with Inhomogeneous Coating","authors":"T. I. Belyankova, E. I. Vorovich, V. Kalinchuk, O. M. Tukodova","doi":"10.25206/2310-9793-2018-6-4-9-17","DOIUrl":"https://doi.org/10.25206/2310-9793-2018-6-4-9-17","url":null,"abstract":"A problem on surface sh-waves’ propagation in a piezoelectric structure with a coating from a functionally graded material is considered. As a \"base\" material, a piezoelectric of 6mm class hexagonal syngony is used. The problem solution is based on the approach, which combines analytical methods of constructing the solution for homogeneous components and numerical methods of constructing the solution for inhomogeneous components of a heterogeneous structure. For problems with an electrically open or closed free surface, the transformation of the surface wave field, depending on the character of the change of the coating properties, is studied. Peculiarities of the surface waves’ behaviour at different combinations of the coating and substructure materials are investigated. It is demonstrated, that by means of a special change of the coating properties it is possible to obtain the structure, on the surface of which Love waves or Bleustein–Gulyaev waves (BGW) are propagated, or the structure in which surface waves are absent in a definite frequency range.","PeriodicalId":394567,"journal":{"name":"2018 Dynamics of Systems, Mechanisms and Machines (Dynamics)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124605163","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：