Pub Date : 2022-05-11DOI: 10.37394/232022.2022.2.18
Mohamed A. Shamseldin
This paper presents a systematic technique for designing the input signal to identify the one-stage servomechanism system. Sources of nonlinearities such as friction and backlash consider an obstacle to obtaining an accurate model. Also, most such systems suffer from a lack of system parameters data. So, this study establishes a model using the black-box modeling approach; simulations are performed based on real-time data collected by LabVIEW software and processed using MATLAB System Identification toolbox. The input signal for the servomechanism system driver is a pseudo-random binary sequence that considers violent excitation in the frequency interval and the output signal is the corresponding stage speed measured by rotary encoder. The candidate models were obtained using linear least squares, nonlinear least squares, and Deep Neural Network (DNN). The validation results proved that the identified model based on DNN has the smallest mean square errors compared to other candidate models.
{"title":"Deep Neural Network System Identification for Servomechanism System","authors":"Mohamed A. Shamseldin","doi":"10.37394/232022.2022.2.18","DOIUrl":"https://doi.org/10.37394/232022.2022.2.18","url":null,"abstract":"This paper presents a systematic technique for designing the input signal to identify the one-stage servomechanism system. Sources of nonlinearities such as friction and backlash consider an obstacle to obtaining an accurate model. Also, most such systems suffer from a lack of system parameters data. So, this study establishes a model using the black-box modeling approach; simulations are performed based on real-time data collected by LabVIEW software and processed using MATLAB System Identification toolbox. The input signal for the servomechanism system driver is a pseudo-random binary sequence that considers violent excitation in the frequency interval and the output signal is the corresponding stage speed measured by rotary encoder. The candidate models were obtained using linear least squares, nonlinear least squares, and Deep Neural Network (DNN). The validation results proved that the identified model based on DNN has the smallest mean square errors compared to other candidate models.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134005747","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 : 2022-05-07DOI: 10.37394/232022.2022.2.15
M. J. Lavorante, R. Bessone, Samanta Saiquita, R. M. Aiello, E. Martínez
Channels were machined over the active area of a 316L stainless steel electrode, in vertical electrode position, with a width of 5 mm that is reduced to 1 mm and then widened again. For its construction, electro discharge machining was selected since it also allows obtaining different degrees of roughness, which can favor the detachment of bubbles to a larger quantity. Analysis of its performance was carried out at an initial operating temperature of 30 ° C and at seven different distances between electrodes, namely: 9.45; 7.45; 6.35; 5.80; 4.30; 2.80 and 2.45 in millimeters, in order to determine the one with the lowest energy consumption to produce a fixed amount of hydrogen. Results obtained from the evaluated distances show that as the distance between electrodes becomes smaller, so do the electrical and transport resistances. The percentage increase in the current density for the distances of 9.45 and 2.45 mm, with respect to the applied potential difference, shows that at 2.2 V, it is above 80% (in current density) and maintained, with small fluctuations throughout the range of applied voltages. Therefore, using the same amount of energy, a greater volume of hydrogen is obtained.
{"title":"Performance of an Electrode Topology for Alkaline Water Electrolysis Under Specific Operating Conditions","authors":"M. J. Lavorante, R. Bessone, Samanta Saiquita, R. M. Aiello, E. Martínez","doi":"10.37394/232022.2022.2.15","DOIUrl":"https://doi.org/10.37394/232022.2022.2.15","url":null,"abstract":"Channels were machined over the active area of a 316L stainless steel electrode, in vertical electrode position, with a width of 5 mm that is reduced to 1 mm and then widened again. For its construction, electro discharge machining was selected since it also allows obtaining different degrees of roughness, which can favor the detachment of bubbles to a larger quantity. Analysis of its performance was carried out at an initial operating temperature of 30 ° C and at seven different distances between electrodes, namely: 9.45; 7.45; 6.35; 5.80; 4.30; 2.80 and 2.45 in millimeters, in order to determine the one with the lowest energy consumption to produce a fixed amount of hydrogen. Results obtained from the evaluated distances show that as the distance between electrodes becomes smaller, so do the electrical and transport resistances. The percentage increase in the current density for the distances of 9.45 and 2.45 mm, with respect to the applied potential difference, shows that at 2.2 V, it is above 80% (in current density) and maintained, with small fluctuations throughout the range of applied voltages. Therefore, using the same amount of energy, a greater volume of hydrogen is obtained.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117051368","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 : 2022-05-07DOI: 10.37394/232022.2022.2.16
V. Štefan, Kamenszká Adriana
Assembly is an important element in the production process. It largely influences the quality of the product and especially the time required to produce the final product. Studies in the field of assembly show that as technology advances, it is necessary to use new improvements at each stage of production, which includes the assembly stage. The aim of every enterprise should be to make the best and most economical use of all the resources at its disposal, on the one hand, and to increase productivity, on the other. Nowadays, ergonomics must be taken into account when solving problems or rationalizing assembly, since most assembly operations are carried out manually. In the theoretical part of the document, the assembly process is described together with the factors that influence it, focusing on manual assembly and its impact on ergonomics. The practical part describes an experiment carried out with the aim to increase the ergonomics of workers and to make the assembly process more efficient at an assembly workplace in a selected industrial enterprise through pre-arrangement of the workplace.
{"title":"The Influence of Assembly Workplace Layout on Ergonomics","authors":"V. Štefan, Kamenszká Adriana","doi":"10.37394/232022.2022.2.16","DOIUrl":"https://doi.org/10.37394/232022.2022.2.16","url":null,"abstract":"Assembly is an important element in the production process. It largely influences the quality of the product and especially the time required to produce the final product. Studies in the field of assembly show that as technology advances, it is necessary to use new improvements at each stage of production, which includes the assembly stage. The aim of every enterprise should be to make the best and most economical use of all the resources at its disposal, on the one hand, and to increase productivity, on the other. Nowadays, ergonomics must be taken into account when solving problems or rationalizing assembly, since most assembly operations are carried out manually. In the theoretical part of the document, the assembly process is described together with the factors that influence it, focusing on manual assembly and its impact on ergonomics. The practical part describes an experiment carried out with the aim to increase the ergonomics of workers and to make the assembly process more efficient at an assembly workplace in a selected industrial enterprise through pre-arrangement of the workplace.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122518991","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 : 2022-05-07DOI: 10.37394/232022.2022.2.17
Samba Aimé Hervé
A remote controlled mobile robot utilizing National Instruments LabVIEW software, communicating over a low-rate serial ISM radio link. The robot is modular in design with system modules connected via serial interfaces to a system controller. A custom power supply and distribution circuit board provides power to the robot using sealed lead acid batteries as the source. The mobile robot streams system voltage and current status, JPEG images, ambient temperature and humidity readings, and GPS location. The project demonstrates the successful use of LabVIEW to develop a system using communication over lowrate serial radio links.
{"title":"Computer Interface for Remote Teleoperated Mobile Robot Based on LabVIEW and Open Source Hardware","authors":"Samba Aimé Hervé","doi":"10.37394/232022.2022.2.17","DOIUrl":"https://doi.org/10.37394/232022.2022.2.17","url":null,"abstract":"A remote controlled mobile robot utilizing National Instruments LabVIEW software, communicating over a low-rate serial ISM radio link. The robot is modular in design with system modules connected via serial interfaces to a system controller. A custom power supply and distribution circuit board provides power to the robot using sealed lead acid batteries as the source. The mobile robot streams system voltage and current status, JPEG images, ambient temperature and humidity readings, and GPS location. The project demonstrates the successful use of LabVIEW to develop a system using communication over lowrate serial radio links.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122639960","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 : 2022-04-13DOI: 10.37394/232022.2022.2.14
J. Nagler
This paper presents, aerodynamics coefficients calculation (Lifting & drag coefficients, pressure central location) of Trapeze wing shape configurations for different aspect ratios (ARs) values by using improved vortex lattice method (VLM), compared with finite-wing and slender body theories. The planar wing was divided into N panels of the size: 6X6 with trapezoid shape panels. As expected, for high ARs the VLM solution for the lifting coefficient is coincided with the finite wing theory whereas for small ARs (<1) it is coincided with the slender body theory (~1). Afterwards, we obtained that the calculated VLM induced drag becomes closer to the finitewing theory as the AR value is increased.
{"title":"On Trapeze Wing Aerodynamics Calculations Based on Improved Vortex Lattice Method","authors":"J. Nagler","doi":"10.37394/232022.2022.2.14","DOIUrl":"https://doi.org/10.37394/232022.2022.2.14","url":null,"abstract":"This paper presents, aerodynamics coefficients calculation (Lifting & drag coefficients, pressure central location) of Trapeze wing shape configurations for different aspect ratios (ARs) values by using improved vortex lattice method (VLM), compared with finite-wing and slender body theories. The planar wing was divided into N panels of the size: 6X6 with trapezoid shape panels. As expected, for high ARs the VLM solution for the lifting coefficient is coincided with the finite wing theory whereas for small ARs (<1) it is coincided with the slender body theory (~1). Afterwards, we obtained that the calculated VLM induced drag becomes closer to the finitewing theory as the AR value is increased.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129332285","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 : 2022-03-23DOI: 10.37394/232022.2022.2.13
Salahaldein Alsadey, A. Omran
This study aimed to study the effects of asuperplasticizing admixture, namely, Sikament-NN superplasticizer, on concrete properties, such as workability and compressive strength. Experiments were performed on different concrete mixes with water–cement ratios of 0.50, 0.55, and 0.60. The superplasticizer dosages by weight of cement were 0%, 0.8%, 1%, and 1.2%. The experiments were classified into two phases: the first phase focused on the effects of superplasticizer admixture on workability and compressive strength, and the second phase determined the influence of superplasticizer admixture on concrete quality by reducing the amount of mixing water. Results showed that the addition of superplasticizer admixture improved workability and compressive strength. The experiment program included tests on workability, slump test, and flow table. For hardened concrete’s compressive strength test, we compared the properties of superplasticizer-based concrete with those of concrete without superplasticizer. The superplasticizer led to a significant water reduction but maintained workability.
{"title":"Effect of Superplasticizers to Enhance the Properties of Concrete","authors":"Salahaldein Alsadey, A. Omran","doi":"10.37394/232022.2022.2.13","DOIUrl":"https://doi.org/10.37394/232022.2022.2.13","url":null,"abstract":"This study aimed to study the effects of asuperplasticizing admixture, namely, Sikament-NN superplasticizer, on concrete properties, such as workability and compressive strength. Experiments were performed on different concrete mixes with water–cement ratios of 0.50, 0.55, and 0.60. The superplasticizer dosages by weight of cement were 0%, 0.8%, 1%, and 1.2%. The experiments were classified into two phases: the first phase focused on the effects of superplasticizer admixture on workability and compressive strength, and the second phase determined the influence of superplasticizer admixture on concrete quality by reducing the amount of mixing water. Results showed that the addition of superplasticizer admixture improved workability and compressive strength. The experiment program included tests on workability, slump test, and flow table. For hardened concrete’s compressive strength test, we compared the properties of superplasticizer-based concrete with those of concrete without superplasticizer. The superplasticizer led to a significant water reduction but maintained workability.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116657320","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 : 2022-03-19DOI: 10.37394/232022.2022.2.8
S. Duicu
In the paper are shown some advantages of using heat pumps as a renewable source of energy. Also it is make a short presentation of cooling and heating systems together with the main sources of thermal energy.
本文介绍了热泵作为一种可再生能源的优点。并简要介绍了冷却和加热系统以及主要的热能来源。
{"title":"Using the Heat Pumps as a Renewable Source of Energy","authors":"S. Duicu","doi":"10.37394/232022.2022.2.8","DOIUrl":"https://doi.org/10.37394/232022.2022.2.8","url":null,"abstract":"In the paper are shown some advantages of using heat pumps as a renewable source of energy. Also it is make a short presentation of cooling and heating systems together with the main sources of thermal energy.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123118610","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 : 2022-03-19DOI: 10.37394/232022.2022.2.12
F. Patania, A. Gagliano, F. Nocera, A. Agrifoglio
The research was funded by “Operative National Plan - European Capital for Regional Development” (PON-FERS 2007-2013, Industry 2015). Authors considered the Sicilian Little and Middle Enterprise (LME) producing wastes from operational processes as like woody chips, wood shavings, shells of hazelnut or almond and so on. A previous survey carried out on a consistent sample of Sicilian LME showed that electrical power required by operational processes ranges substantially around three main values (250 / 500 / 635 kWe) and research was addressed to obtain previous values of electrical power by process of conversion of biomass. People takes in consideration the exploitation of biomass through pyrolysis process since it produces syngas usable as fuel in gas-turbine of CHP plant, bio-oil and bio-char too, both of them able to supply thermal energy to many section of expected plant. The whole paper describes the general plane of research (three sections of loop of plants) and particularly guidelines for: calculus of sizes of biomass stockpile storage (storage and drying - first section); design of equipments of pyrolysis process and exhausts treatment (pyrolysis process – second section); design of cogeneration system (CHP techniques – third section). The final result of research will specify too the economical decreasing of operational costs of LME and the remarkable environmental benefits arose by exploitation of biomass. For room reasons, the part one of paper describes the generalized characteristics of research and results of calculations to design drying and storage section.
该研究由“国家行动计划-欧洲区域发展资本”(PON-FERS 2007-2013, Industry 2015)资助。作者认为西西里中小企业(LME)在生产过程中产生的废物如木屑、刨花、榛子壳或杏仁壳等。先前对西西里LME的一致样本进行的调查表明，操作过程所需的电力基本上在三个主要值(250 / 500 / 635千瓦时)左右，并且研究了通过生物质转化过程获得的电力的先前值。人们考虑通过热解过程开发生物质，因为它产生的合成气可以作为热电联产电厂燃气轮机的燃料，生物油和生物炭也可以作为燃料，它们都可以为预期电厂的许多区段提供热能。全文描述了研究的总体平面(三部分的工厂回路)，并详细说明了:生物质储存的规模计算(储存和干燥-第一部分)，热解过程和废气处理设备的设计(热解过程-第二部分)，热电联产系统的设计(热电联产技术-第三部分)。研究的最终结果还将说明LME运营成本的经济降低以及生物质开发带来的显著环境效益。由于空间的原因，本文第一部分介绍了研究的一般特点和计算结果，以设计干燥和储存段。
{"title":"An Applied “energy System” (ES) to Produce Energy by Wasted Biomass (Part One)","authors":"F. Patania, A. Gagliano, F. Nocera, A. Agrifoglio","doi":"10.37394/232022.2022.2.12","DOIUrl":"https://doi.org/10.37394/232022.2022.2.12","url":null,"abstract":"The research was funded by “Operative National Plan - European Capital for Regional Development” (PON-FERS 2007-2013, Industry 2015). Authors considered the Sicilian Little and Middle Enterprise (LME) producing wastes from operational processes as like woody chips, wood shavings, shells of hazelnut or almond and so on. A previous survey carried out on a consistent sample of Sicilian LME showed that electrical power required by operational processes ranges substantially around three main values (250 / 500 / 635 kWe) and research was addressed to obtain previous values of electrical power by process of conversion of biomass. People takes in consideration the exploitation of biomass through pyrolysis process since it produces syngas usable as fuel in gas-turbine of CHP plant, bio-oil and bio-char too, both of them able to supply thermal energy to many section of expected plant. The whole paper describes the general plane of research (three sections of loop of plants) and particularly guidelines for:\u0000\u0000calculus of sizes of biomass stockpile storage (storage and drying - first section);\u0000design of equipments of pyrolysis process and exhausts treatment (pyrolysis process – second section);\u0000design of cogeneration system (CHP techniques – third section).\u0000The final result of research will specify too the economical decreasing of operational costs of LME and the remarkable environmental benefits arose by exploitation of biomass. For room reasons, the part one of paper describes the generalized characteristics of research and results of calculations to design drying and storage section.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122235496","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 : 2022-03-19DOI: 10.37394/232022.2022.2.7
Josseny Ciarrochi, A. Pérez, F. Rivas-Echeverría
In this research an indicator of social sustainability for Venezuela was designed using a statistical methodology, using information from the sustainable development social dimension for each of the Venezuelan states during 2007-2009. For building the social sustainability indicator (SSI) it was used the first two principal components obtained from the analysis for each year and as aggregation method the sum of components was used. The resulting values of social sustainability indicator is decomposed into 5 levels in similar way to the sustainability barometer and federal entities with the corresponding SSI level were assigned.
{"title":"Social Sustainability Measurement for Venezuela During 2007–2009","authors":"Josseny Ciarrochi, A. Pérez, F. Rivas-Echeverría","doi":"10.37394/232022.2022.2.7","DOIUrl":"https://doi.org/10.37394/232022.2022.2.7","url":null,"abstract":"In this research an indicator of social sustainability for Venezuela was designed using a statistical methodology, using information from the sustainable development social dimension for each of the Venezuelan states during 2007-2009. For building the social sustainability indicator (SSI) it was used the first two principal components obtained from the analysis for each year and as aggregation method the sum of components was used. The resulting values of social sustainability indicator is decomposed into 5 levels in similar way to the sustainability barometer and federal entities with the corresponding SSI level were assigned.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133230265","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 : 2022-03-19DOI: 10.37394/232022.2022.2.3
Xiao-jie Zhao, Li Yao
Motor imagery training has been indicated to be effective in motor function rehabilitation and motor skill learning. The neural mechanism underlying motor training has attracted increased neuroimaging explorations. Related neuroimaging studies demonstrated that resting-state can offer the possibility to examine the neural mechanism of motor execution training. However, motor imagery training, as another part of motor training, has been few investigated. To address this issue, eigenvector centrality mapping (ECM) method was applied to explore functional connectivity of resting-state in motor imagery training. As a data-driven analysis method, although ECM can assess the computational measurement of eigenvector centrality for capturing intrinsic neural architecture on a voxel-wise level without any prior assumptions, it is still limited in application for making pseudo enhancement in some nodes or zero centrality in all nodes. In this study, we proposed an improved ECM by adding threshold, dispersion coefficient, weighted coefficient and the initial parameters referring to Google Webpage search ranking algorithm, and applied the proposed ECM to functional connectivity measure of resting-state before and after motor imagery training. The proposed ECM showed the advantage of automatic discharge weak links and the enhancement in node ordering resolution comparing with the original ECM. The results from voxel-based comparison of the centrality between the resting-state after and before motor imagery training revealed that the significantly increased eigenvector centrality was detected in the precuneus and medial frontal gyrus for the experimental group while no significant alterations were found for the control group after training. These alterations may be related to the spatial information integration and inner state modulation of motor imagery training, and further provided new insights into the understanding of the neural mechanism underlying motor imagery training.
{"title":"Changes in Functional Connectivity of Resting-state after Motor Imagery Training Detected by Eigenvector Centrality Mapping","authors":"Xiao-jie Zhao, Li Yao","doi":"10.37394/232022.2022.2.3","DOIUrl":"https://doi.org/10.37394/232022.2022.2.3","url":null,"abstract":"Motor imagery training has been indicated to be effective in motor function rehabilitation and motor skill learning. The neural mechanism underlying motor training has attracted increased neuroimaging explorations. Related neuroimaging studies demonstrated that resting-state can offer the possibility to examine the neural mechanism of motor execution training. However, motor imagery training, as another part of motor training, has been few investigated. To address this issue, eigenvector centrality mapping (ECM) method was applied to explore functional connectivity of resting-state in motor imagery training. As a data-driven analysis method, although ECM can assess the computational measurement of eigenvector centrality for capturing intrinsic neural architecture on a voxel-wise level without any prior assumptions, it is still limited in application for making pseudo enhancement in some nodes or zero centrality in all nodes. In this study, we proposed an improved ECM by adding threshold, dispersion coefficient, weighted coefficient and the initial parameters referring to Google Webpage search ranking algorithm, and applied the proposed ECM to functional connectivity measure of resting-state before and after motor imagery training. The proposed ECM showed the advantage of automatic discharge weak links and the enhancement in node ordering resolution comparing with the original ECM. The results from voxel-based comparison of the centrality between the resting-state after and before motor imagery training revealed that the significantly increased eigenvector centrality was detected in the precuneus and medial frontal gyrus for the experimental group while no significant alterations were found for the control group after training. These alterations may be related to the spatial information integration and inner state modulation of motor imagery training, and further provided new insights into the understanding of the neural mechanism underlying motor imagery training.","PeriodicalId":443735,"journal":{"name":"DESIGN, CONSTRUCTION, MAINTENANCE","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116661181","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}
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