Aiming at the problem of water environmental garbage cleaning, this paper based on RRT* planning algorithm, combined with artificial potential field method to improve the path planning algorithm, to achieve the obstacle avoidance path planning of cleaning equipment. In the process of water area garbage cleaning, the cleaning equipment not only needs to avoid obstacles, but also is affected by current resistance in the process of moving. Therefore, the resistance during the moving process of the cleaning device is denoted as the potential field partial repulsion force, and the potential field function is introduced into the algorithm sampling process, so as to solve the problems of blind node expansion and slow convergence rate of RRT* algorithm itself. In addition, the fixed step size in the sampling process is changed to the dynamic step size, which makes the path obtained by RRT* algorithm smoother. Finally, the simulation based on MA TLAB verifies the feasibility and effectiveness of the improved algorithm.
{"title":"Improved RRT* path planning algorithm based on artificial potential field method","authors":"Huimin Chen, Peilin Dou, Zhen Wang, Huizhong Zhang","doi":"10.1109/WCMEIM56910.2022.10021548","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021548","url":null,"abstract":"Aiming at the problem of water environmental garbage cleaning, this paper based on RRT* planning algorithm, combined with artificial potential field method to improve the path planning algorithm, to achieve the obstacle avoidance path planning of cleaning equipment. In the process of water area garbage cleaning, the cleaning equipment not only needs to avoid obstacles, but also is affected by current resistance in the process of moving. Therefore, the resistance during the moving process of the cleaning device is denoted as the potential field partial repulsion force, and the potential field function is introduced into the algorithm sampling process, so as to solve the problems of blind node expansion and slow convergence rate of RRT* algorithm itself. In addition, the fixed step size in the sampling process is changed to the dynamic step size, which makes the path obtained by RRT* algorithm smoother. Finally, the simulation based on MA TLAB verifies the feasibility and effectiveness of the improved algorithm.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122411989","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 : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021545
Shilong Lv, Zenghui Liu
Stepping motor has the advantages of simple control, accurate positioning, no accumulated error and low rotor inertia. Stepping motor has a very bright performance in the field of automation, which has obvious propulsion effect on the formation of mechatronics system. After using the stepping motor, the error of the motor is reduced, and the positioning of the motor is more accurate. At the same time, combining the stepping motor with PLC can significantly enhance the advantages of the stepping motor. In this paper, the stepping motor based on PLC control is the main research topic. On the hardware design of the system, the design is made from the following aspects: the selection of PLC model, I/O points of input and output, the principle of automatic control and control circuit. In the software design of the system, the control program of the system is analyzed to ensure that the design requirements are met, and it has certain practical application value.
{"title":"Step Motor Control Based on PLC","authors":"Shilong Lv, Zenghui Liu","doi":"10.1109/WCMEIM56910.2022.10021545","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021545","url":null,"abstract":"Stepping motor has the advantages of simple control, accurate positioning, no accumulated error and low rotor inertia. Stepping motor has a very bright performance in the field of automation, which has obvious propulsion effect on the formation of mechatronics system. After using the stepping motor, the error of the motor is reduced, and the positioning of the motor is more accurate. At the same time, combining the stepping motor with PLC can significantly enhance the advantages of the stepping motor. In this paper, the stepping motor based on PLC control is the main research topic. On the hardware design of the system, the design is made from the following aspects: the selection of PLC model, I/O points of input and output, the principle of automatic control and control circuit. In the software design of the system, the control program of the system is analyzed to ensure that the design requirements are met, and it has certain practical application value.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122547563","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 : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021525
Wen-Zhong Liu, Lu Wang, S. Guo, Da-Rong Huang
In the process of observer designing of descriptor systems, some system transformations are usually used to transform the descriptor systems into standard normal ones. However, some originally observable systems are not observable after these system transformations. For some standard normal systems with unknown interference, descriptor system form is also often constructed to design observers by using an augmented state vector. And the observability is also not always keeping in the latter transformations. The loss of observability will lead to a wrong observer, and usually it is inapparent. An extra constraint is added into the transformation matrices, and the observability can be guaranteed. Furthermore, the calculate process of the matrices is given. Two examples are shown to illustrate the correctness and the effectiveness of the presented methods.
{"title":"Observability Keeping in Observer Design of Descriptor System and Its Form","authors":"Wen-Zhong Liu, Lu Wang, S. Guo, Da-Rong Huang","doi":"10.1109/WCMEIM56910.2022.10021525","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021525","url":null,"abstract":"In the process of observer designing of descriptor systems, some system transformations are usually used to transform the descriptor systems into standard normal ones. However, some originally observable systems are not observable after these system transformations. For some standard normal systems with unknown interference, descriptor system form is also often constructed to design observers by using an augmented state vector. And the observability is also not always keeping in the latter transformations. The loss of observability will lead to a wrong observer, and usually it is inapparent. An extra constraint is added into the transformation matrices, and the observability can be guaranteed. Furthermore, the calculate process of the matrices is given. Two examples are shown to illustrate the correctness and the effectiveness of the presented methods.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122619860","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 : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021354
H. Wen
The application of construction machinery is an important technical condition to ensure the development of industrialization. The stability of its equipment operation is a necessary condition to maintain industrial production efficiency. In the application of construction machinery, the use of hydraulic system is more frequent, because the hydraulic system in the long-term use often appear various problems, which needs to strengthen the fault diagnosis and maintenance technology of the hydraulic system of construction machinery, in order to make it in a good working state. This paper introduces the working characteristics and fault types of hydraulic system of construction machinery, lists the diagnosis methods of hydraulic system fault, and puts forward the specific application of hydraulic system fault maintenance technology.
{"title":"Fault Diagnosis and Maintenance Techniques for Hydraulic System of Common Construction Machinery","authors":"H. Wen","doi":"10.1109/WCMEIM56910.2022.10021354","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021354","url":null,"abstract":"The application of construction machinery is an important technical condition to ensure the development of industrialization. The stability of its equipment operation is a necessary condition to maintain industrial production efficiency. In the application of construction machinery, the use of hydraulic system is more frequent, because the hydraulic system in the long-term use often appear various problems, which needs to strengthen the fault diagnosis and maintenance technology of the hydraulic system of construction machinery, in order to make it in a good working state. This paper introduces the working characteristics and fault types of hydraulic system of construction machinery, lists the diagnosis methods of hydraulic system fault, and puts forward the specific application of hydraulic system fault maintenance technology.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133300424","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 : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021357
Li Zhaobo, Wang Xinzui
Tinnitus is a global challenge with high prevalence and low cure rates, and its clinical examination process is complex and extremely difficult, and there is a lack of a quick and easy way to diagnose objectively. In this study, we found the difference in the mean power spectral density (mPSD) of electroencephalography (EEG) signals between tinnitus patients and healthy people, and realized the classification of tinnitus locations by extracting the connectivity features of the brain. The feature factor with the best classification accuracy was the connectivity feature the Pearson correlation coefficient (PCC), with an accuracy of 99.42%, and the Phase locking value (PLV) also performed well. The experimental conclusions demonstrate that EEG signals can be used as biomarkers to identify the location of tinnitus, and can provide clinicians with a new objective diagnostic strategy.
{"title":"Intelligent diagnosis of tinnitus using electroencephalography","authors":"Li Zhaobo, Wang Xinzui","doi":"10.1109/WCMEIM56910.2022.10021357","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021357","url":null,"abstract":"Tinnitus is a global challenge with high prevalence and low cure rates, and its clinical examination process is complex and extremely difficult, and there is a lack of a quick and easy way to diagnose objectively. In this study, we found the difference in the mean power spectral density (mPSD) of electroencephalography (EEG) signals between tinnitus patients and healthy people, and realized the classification of tinnitus locations by extracting the connectivity features of the brain. The feature factor with the best classification accuracy was the connectivity feature the Pearson correlation coefficient (PCC), with an accuracy of 99.42%, and the Phase locking value (PLV) also performed well. The experimental conclusions demonstrate that EEG signals can be used as biomarkers to identify the location of tinnitus, and can provide clinicians with a new objective diagnostic strategy.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133447650","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}
This paper plans to develop MSP430, using low-power wake-up technology, carrying sensors for real-time underwater temperature profile measurement and CT hydrological data collection, and develop an environmental monitoring buoy suitable for polar ice area. It has the capability of low power consumption and long endurance, and has the redundancy to choose to carry a variety of sensors. Relying on China's polar scientific investigation, the buoy successfully completed the field test, which is a beneficial attempt to innovate the polar ice area observation technology in China.
{"title":"Polar Environment Monitoring Buoy Based on MSP430 MCU","authors":"Feng Zhang, Musheng Lan, Yinke Dou, Jianfeng He, Zhirui Xing","doi":"10.1109/WCMEIM56910.2022.10021565","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021565","url":null,"abstract":"This paper plans to develop MSP430, using low-power wake-up technology, carrying sensors for real-time underwater temperature profile measurement and CT hydrological data collection, and develop an environmental monitoring buoy suitable for polar ice area. It has the capability of low power consumption and long endurance, and has the redundancy to choose to carry a variety of sensors. Relying on China's polar scientific investigation, the buoy successfully completed the field test, which is a beneficial attempt to innovate the polar ice area observation technology in China.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131996158","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 : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021361
Chun-Hsu Chen, Zhaopeng Qiu
In a specific scene, a robot is needed, which can complete the obstacle pile layout task in the fastest time. This paper proposes a software and hardware system design scheme based on the research status at home and abroad. It is verified by practice that it can not only complete the obstacle placement task accurately, but also complete it with high efficiency and accuracy in a short time. The robot design in this paper needs efficient algorithm of line patrol and precise debugging of sensors.
{"title":"Design and Implementation of an Autonomous Line Patrol and Obstacle Distribution Robot","authors":"Chun-Hsu Chen, Zhaopeng Qiu","doi":"10.1109/WCMEIM56910.2022.10021361","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021361","url":null,"abstract":"In a specific scene, a robot is needed, which can complete the obstacle pile layout task in the fastest time. This paper proposes a software and hardware system design scheme based on the research status at home and abroad. It is verified by practice that it can not only complete the obstacle placement task accurately, but also complete it with high efficiency and accuracy in a short time. The robot design in this paper needs efficient algorithm of line patrol and precise debugging of sensors.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134195237","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 : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021417
Yuanhao Hu, Lei Xu, Junbai Zhong, Han Gao, Zongliang Mou
Aiming at the problems of low production efficiency and high manufacturing cost caused by the disorder of order sorting in manufacturing enterprises. This paper presents an improved Delphi-AHP-TOPSIS method. Firstly, Delphi method is used to determine the main evaluation criteria and sub-criterion by experts. Secondly, the analytic hierarchy process (AHP) is used to compare each index. After that, the relative weight of the criteria is determined through the subjective judgment of many expert. Thirdly, the decision-making scheme is scored and ranked based on the technique for order preference by similarity to ideal solution (TOPSIS). Finally, the improved method is compared with the single AHP or TOPSIS method by introducing the adjacent scheme differentiation method. The simulation results have shown that the improved Delphi-AHP-TOPSIS method proposed in this paper can effectively guide manufacturing enterprises to make order priority decisions.
{"title":"Order Priority Decision of Manufacturing Enterprises: An Improved Delphi-AHP-TOPSIS Methodology","authors":"Yuanhao Hu, Lei Xu, Junbai Zhong, Han Gao, Zongliang Mou","doi":"10.1109/WCMEIM56910.2022.10021417","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021417","url":null,"abstract":"Aiming at the problems of low production efficiency and high manufacturing cost caused by the disorder of order sorting in manufacturing enterprises. This paper presents an improved Delphi-AHP-TOPSIS method. Firstly, Delphi method is used to determine the main evaluation criteria and sub-criterion by experts. Secondly, the analytic hierarchy process (AHP) is used to compare each index. After that, the relative weight of the criteria is determined through the subjective judgment of many expert. Thirdly, the decision-making scheme is scored and ranked based on the technique for order preference by similarity to ideal solution (TOPSIS). Finally, the improved method is compared with the single AHP or TOPSIS method by introducing the adjacent scheme differentiation method. The simulation results have shown that the improved Delphi-AHP-TOPSIS method proposed in this paper can effectively guide manufacturing enterprises to make order priority decisions.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122893600","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 : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021497
FanFan, Yan Rong
In the product lifecycle, there exist multi-view Boms for different departments and functions. Each department in the custom when the BOM is not a unified specification design and management, and for different products of different enterprise each department involved in custom BOM. BOM attribute column is also a dynamic variable, most enterprises for BOM custom is still adopt the way of print before the department and the department of information sharing. Therefore, this paper proposes a concept of super BOM table, which can dynamically generate each business BOM table to meet the customization requirements of each department for BOM table. In addition, this paper also designs a super BOM creation platform based on B/S architecture to realize the paperless management of BOM., and proposes a new database access development mode for dynamic table building behavior. The last part of the article takes the machine tool product of A company as an example to test the related functions of the web platform. Practice has proved that the design and implementation of super-BOM based on dynamic library table makes the way of customized BOM more standardized and convenient, realizes the paperless management of BOM information, and greatly improves the management level of BOM table in enterprises.
{"title":"Design and implementation of super BOM based on dynamic library table","authors":"FanFan, Yan Rong","doi":"10.1109/WCMEIM56910.2022.10021497","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021497","url":null,"abstract":"In the product lifecycle, there exist multi-view Boms for different departments and functions. Each department in the custom when the BOM is not a unified specification design and management, and for different products of different enterprise each department involved in custom BOM. BOM attribute column is also a dynamic variable, most enterprises for BOM custom is still adopt the way of print before the department and the department of information sharing. Therefore, this paper proposes a concept of super BOM table, which can dynamically generate each business BOM table to meet the customization requirements of each department for BOM table. In addition, this paper also designs a super BOM creation platform based on B/S architecture to realize the paperless management of BOM., and proposes a new database access development mode for dynamic table building behavior. The last part of the article takes the machine tool product of A company as an example to test the related functions of the web platform. Practice has proved that the design and implementation of super-BOM based on dynamic library table makes the way of customized BOM more standardized and convenient, realizes the paperless management of BOM information, and greatly improves the management level of BOM table in enterprises.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124222780","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 : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021511
F. Chen, Jielin Deng
This paper presents an image stitching method of BGA component for industrial operation. The mounter is the core equipment of the surface mount system, and it currently has no way to place components larger than the camera's field of view. Therefore, a high-speed image stitching method of BGA component is still not available. In this method, the hu invariant moment is used to determine the overlapping area of the image and reduce the range of feature point extraction. After obtaining the feature points, the differences between the SIFT (Scale Invariant Features Transform) algorithm, the SURF (Speeded Up Robust Features) algorithm and the improved SURF algorithm are compared. The improved SURF algorithm combines the SURF feature extraction method and the FREAK (Fast Retina Keypoint) descriptor is developed. After the feature points are processed by BFMather matching and RANSAC algorithm, the image transformation matrix of the two images is calculated. Finally, the perspective transformation is performed on the image to complete the image stitching. This image stitching method is shown to be simple and effective for high-speed industrial application. The procedure taken can be extended to other similar IC component and to other machine.
{"title":"An Improved SURF Algorithm with FREAK Descriptor for BGA Component Image Stitching","authors":"F. Chen, Jielin Deng","doi":"10.1109/WCMEIM56910.2022.10021511","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021511","url":null,"abstract":"This paper presents an image stitching method of BGA component for industrial operation. The mounter is the core equipment of the surface mount system, and it currently has no way to place components larger than the camera's field of view. Therefore, a high-speed image stitching method of BGA component is still not available. In this method, the hu invariant moment is used to determine the overlapping area of the image and reduce the range of feature point extraction. After obtaining the feature points, the differences between the SIFT (Scale Invariant Features Transform) algorithm, the SURF (Speeded Up Robust Features) algorithm and the improved SURF algorithm are compared. The improved SURF algorithm combines the SURF feature extraction method and the FREAK (Fast Retina Keypoint) descriptor is developed. After the feature points are processed by BFMather matching and RANSAC algorithm, the image transformation matrix of the two images is calculated. Finally, the perspective transformation is performed on the image to complete the image stitching. This image stitching method is shown to be simple and effective for high-speed industrial application. The procedure taken can be extended to other similar IC component and to other machine.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124234109","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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