Pub Date : 2014-12-01DOI: 10.1109/STA.2014.7086807
B. Bouaziz, F. Bacha, M. Gasmi
This paper presents a new sliding mode Switching Table direct power control for three-phase grid-connected voltage source converters (VSC). The proposed Direct Power Control (DPC) strategy employs a nonlinear sliding mode (SM) approach to directly calculate the required converter's control voltage so as to eliminate the instantaneous errors of active and reactive powers. In this configuration, the extra current control loops are eliminated, which simplifies system design and improves the transient performance. This improved control strategy combines the DPC strategy, sliding mode approach (SM), and switching table (ST) selection vectors technique, so as to directly regulate the instantaneous active and reactive powers of grid-connected voltage source converters. Simulation results for the proposed Variable Switching Frequency Direct Power Control based on Sliding Mode control approach (VSF-SM-DPC). The proposed VSF-SM-DPC is capable of providing enhanced transient performance, and keeps the steady-state harmonic spectra. The robustness of the proposed VSF-ST-DPC to the effect of the line inductance values mismatch is also inspected during active and reactive power changes. The proposed VSF-SM-DPC is inspecting to tracking capability with high-control bandwidth.
{"title":"Variable Switching Frequency Direct Power Control based on Sliding Mode approach for grid connected voltage source converters","authors":"B. Bouaziz, F. Bacha, M. Gasmi","doi":"10.1109/STA.2014.7086807","DOIUrl":"https://doi.org/10.1109/STA.2014.7086807","url":null,"abstract":"This paper presents a new sliding mode Switching Table direct power control for three-phase grid-connected voltage source converters (VSC). The proposed Direct Power Control (DPC) strategy employs a nonlinear sliding mode (SM) approach to directly calculate the required converter's control voltage so as to eliminate the instantaneous errors of active and reactive powers. In this configuration, the extra current control loops are eliminated, which simplifies system design and improves the transient performance. This improved control strategy combines the DPC strategy, sliding mode approach (SM), and switching table (ST) selection vectors technique, so as to directly regulate the instantaneous active and reactive powers of grid-connected voltage source converters. Simulation results for the proposed Variable Switching Frequency Direct Power Control based on Sliding Mode control approach (VSF-SM-DPC). The proposed VSF-SM-DPC is capable of providing enhanced transient performance, and keeps the steady-state harmonic spectra. The robustness of the proposed VSF-ST-DPC to the effect of the line inductance values mismatch is also inspected during active and reactive power changes. The proposed VSF-SM-DPC is inspecting to tracking capability with high-control bandwidth.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"754 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132867767","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 : 2014-12-01DOI: 10.1109/STA.2014.7086676
K. Kacha, F. Djeffal, H. Ferhati, A. Benkouider, I. Berbezier
In order to improve the electrical performance of the conventional amorphous SiGe thin-film solar cells, a new multi-trench technique has been proposed. In this method, the multi-trench is created in the intrinsic SiGe layer and filled with p-type doped Si. The p-type trenches in the intrinsic SiGe layer improve the electrical performance of the proposed design. Electrical characteristics of the proposed structure are analyzed and optimized by 2-D numerical modeling and compared with conventional amorphous SiGe thin-film solar cell characteristics. The extracted results show that the multi-trench-based technique has excellent effect on the fill factor and efficiency of the device.
{"title":"Multi-trench-based technique to improve amorphous SiGe thin-film solar cell performance","authors":"K. Kacha, F. Djeffal, H. Ferhati, A. Benkouider, I. Berbezier","doi":"10.1109/STA.2014.7086676","DOIUrl":"https://doi.org/10.1109/STA.2014.7086676","url":null,"abstract":"In order to improve the electrical performance of the conventional amorphous SiGe thin-film solar cells, a new multi-trench technique has been proposed. In this method, the multi-trench is created in the intrinsic SiGe layer and filled with p-type doped Si. The p-type trenches in the intrinsic SiGe layer improve the electrical performance of the proposed design. Electrical characteristics of the proposed structure are analyzed and optimized by 2-D numerical modeling and compared with conventional amorphous SiGe thin-film solar cell characteristics. The extracted results show that the multi-trench-based technique has excellent effect on the fill factor and efficiency of the device.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132144260","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 : 2014-12-01DOI: 10.1109/STA.2014.7086722
M. Meguellati, F. Srairi, F. Djeffal, L. Saidi
Swimming microrobots have been broadly considered and drawn great attention for the mainly recent years, in robotics and biomedical domains, due to their alternative applications. This work models and optimizes a new swimming microrobot design for biomedical applications. The key idea behind this contribution is to find out the best dimension and electromechanical parameters of the investigated swimming microrobot that will yield the maximum thrust force for reliable swimming microrobot applications. The analytical models are developed to calculate the thrust force generated by a hybrid tail. The microrobot is modulated using a nonlinear model-based approach for magnetical control. We show that our proposed device can be significantly improved by using the IPCM hybrid tails with thick link at the end of the tail. Furthermore, the artificial bee colony algorithm is used to ameliorate both, electromechanical parameters and the microrobot geometrical aspect, in order to enhance the performance and robustness behavior of the investigated microrobot. In this context, thrust force of the investigated structure is examined and compared with the conventional microrobots. The obtained results demonstrate that the proposed design can be considered as a potential candidate for high performance microrobot-based applications.
{"title":"Analytical models and optimization of novel swimming microrobot using ABC computation for biomedical applications","authors":"M. Meguellati, F. Srairi, F. Djeffal, L. Saidi","doi":"10.1109/STA.2014.7086722","DOIUrl":"https://doi.org/10.1109/STA.2014.7086722","url":null,"abstract":"Swimming microrobots have been broadly considered and drawn great attention for the mainly recent years, in robotics and biomedical domains, due to their alternative applications. This work models and optimizes a new swimming microrobot design for biomedical applications. The key idea behind this contribution is to find out the best dimension and electromechanical parameters of the investigated swimming microrobot that will yield the maximum thrust force for reliable swimming microrobot applications. The analytical models are developed to calculate the thrust force generated by a hybrid tail. The microrobot is modulated using a nonlinear model-based approach for magnetical control. We show that our proposed device can be significantly improved by using the IPCM hybrid tails with thick link at the end of the tail. Furthermore, the artificial bee colony algorithm is used to ameliorate both, electromechanical parameters and the microrobot geometrical aspect, in order to enhance the performance and robustness behavior of the investigated microrobot. In this context, thrust force of the investigated structure is examined and compared with the conventional microrobots. The obtained results demonstrate that the proposed design can be considered as a potential candidate for high performance microrobot-based applications.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115645654","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 : 2014-12-01DOI: 10.1109/STA.2014.7086781
Imed Bouchrika, A. Boukrouche
Many research studies have recently shown the possibility of recognizing people by the way they walk i.e. gait. This research is mainly fuelled by the wide range of potential applications where gait biometrics could be useful as the case of visual smart surveillance and forensic systems. In this research paper, we present a Haar-like template for the temporal markerless extraction of gait features under various camera viewpoints. A markerless model-based method whereby angular model templates describing the human motion are employed to guide the extraction process. Gait features consist of the angular measurements for the lower legs in addition to the spatial displacement of the human body. To further refine gait features based on their discriminatory potency, a feature selection algorithm is applied using a newly proposed validation-criterion based on the proximity of neighbours belonging to the same class. Experimental results revealed that gait angular measurements derived from the joint motions can achieve a correct classification rate of 73.6% after applying a rectification process back into the sagittal plane.
{"title":"Markerless extraction of gait features using Haar-like template for view-invariant biometrics","authors":"Imed Bouchrika, A. Boukrouche","doi":"10.1109/STA.2014.7086781","DOIUrl":"https://doi.org/10.1109/STA.2014.7086781","url":null,"abstract":"Many research studies have recently shown the possibility of recognizing people by the way they walk i.e. gait. This research is mainly fuelled by the wide range of potential applications where gait biometrics could be useful as the case of visual smart surveillance and forensic systems. In this research paper, we present a Haar-like template for the temporal markerless extraction of gait features under various camera viewpoints. A markerless model-based method whereby angular model templates describing the human motion are employed to guide the extraction process. Gait features consist of the angular measurements for the lower legs in addition to the spatial displacement of the human body. To further refine gait features based on their discriminatory potency, a feature selection algorithm is applied using a newly proposed validation-criterion based on the proximity of neighbours belonging to the same class. Experimental results revealed that gait angular measurements derived from the joint motions can achieve a correct classification rate of 73.6% after applying a rectification process back into the sagittal plane.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114332253","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 : 2014-12-01DOI: 10.1109/STA.2014.7086706
A. Abdallah, A. Mordi
Researchers have invented recently the grid-connected photovoltaic systems to compensate for the power consumption of loads connected to grid either partially or totally. In this paper, grid-connected photovoltaic systems are used also to solve the electric grid problems, specifically any disturbance in amplitude of the grid voltage at the point of common coupling (PCC) by controlling the amount of injected active current, keeping on zero-reactive current injection to sustain the synchronization and unity power factor. In case of grid undervoltage, the photovoltaic system supplies more energy to the non-zero impedance grid to increase the grid voltage. In case of grid overvoltage, the photovoltaic system supplies less energy to this grid to decrease the grid voltage. A control method is presented and the required simulation by Matlab/Simulink is done verifying the expected results.
{"title":"Grid-connected photovoltaic systems for grid voltage correction","authors":"A. Abdallah, A. Mordi","doi":"10.1109/STA.2014.7086706","DOIUrl":"https://doi.org/10.1109/STA.2014.7086706","url":null,"abstract":"Researchers have invented recently the grid-connected photovoltaic systems to compensate for the power consumption of loads connected to grid either partially or totally. In this paper, grid-connected photovoltaic systems are used also to solve the electric grid problems, specifically any disturbance in amplitude of the grid voltage at the point of common coupling (PCC) by controlling the amount of injected active current, keeping on zero-reactive current injection to sustain the synchronization and unity power factor. In case of grid undervoltage, the photovoltaic system supplies more energy to the non-zero impedance grid to increase the grid voltage. In case of grid overvoltage, the photovoltaic system supplies less energy to this grid to decrease the grid voltage. A control method is presented and the required simulation by Matlab/Simulink is done verifying the expected results.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114892723","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 : 2014-12-01DOI: 10.1109/STA.2014.7086731
A. Ltifi, M. Ghariani, R. Neji
This paper presents three different control strategies for controlling an induction motor “IM” in an electric vehicle (EV) application. The control techniques analyzed and compared are: the proportion-integral regulator (PI), the sliding mode control (SMC) and the PI-Sliding Mode Control (PI-SMC). Simulation results show the comparison performance in term of robustness.
{"title":"Performance comparison of PI, SMC and PI-Sliding Mode Controller for EV","authors":"A. Ltifi, M. Ghariani, R. Neji","doi":"10.1109/STA.2014.7086731","DOIUrl":"https://doi.org/10.1109/STA.2014.7086731","url":null,"abstract":"This paper presents three different control strategies for controlling an induction motor “IM” in an electric vehicle (EV) application. The control techniques analyzed and compared are: the proportion-integral regulator (PI), the sliding mode control (SMC) and the PI-Sliding Mode Control (PI-SMC). Simulation results show the comparison performance in term of robustness.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117261227","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 : 2014-12-01DOI: 10.1109/STA.2014.7086771
M. Saihi, B. Boussaid, A. Zouinkhi, M. Abdelkrim
Wireless Sensor Networks (WSN) can experience faults during deployment either due to its hardware malfunctioning or software failure or even harsh environmental factors. This results into presence of anomalies in their time-series collected data. So, these anomalies demand for reliable detection strategies to support in long term and/or in large scale WSN deployments. These data of physical variables are transmitted continuously to a repository for further processing of information as data stream. centralized fault detection based on centralized approach has become an emerging technology for building scalable and energy balanced applications for WSN. In our work, we try to implement the Distributed Fault Detection (DFD) algorithm in a central unit named SOFREL S550 which represent the base station or the sink node and detects the suspicious nodes by exchanging heartbeat messages in active manner. By analyzing the collected heartbeat information, the unit finally identifies failed nodes according to a pre-defined failure detection rule.
{"title":"WSN implementation of DFD algorithm on SOFREL S550/WAVENIS unit","authors":"M. Saihi, B. Boussaid, A. Zouinkhi, M. Abdelkrim","doi":"10.1109/STA.2014.7086771","DOIUrl":"https://doi.org/10.1109/STA.2014.7086771","url":null,"abstract":"Wireless Sensor Networks (WSN) can experience faults during deployment either due to its hardware malfunctioning or software failure or even harsh environmental factors. This results into presence of anomalies in their time-series collected data. So, these anomalies demand for reliable detection strategies to support in long term and/or in large scale WSN deployments. These data of physical variables are transmitted continuously to a repository for further processing of information as data stream. centralized fault detection based on centralized approach has become an emerging technology for building scalable and energy balanced applications for WSN. In our work, we try to implement the Distributed Fault Detection (DFD) algorithm in a central unit named SOFREL S550 which represent the base station or the sink node and detects the suspicious nodes by exchanging heartbeat messages in active manner. By analyzing the collected heartbeat information, the unit finally identifies failed nodes according to a pre-defined failure detection rule.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117342451","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 : 2014-12-01DOI: 10.1109/STA.2014.7086709
D. Chermiti, A. Khedher
This paper presents a loaded SEIG system controlled by a FC-TCR which consists of a big fixed capacitor in parallel with a thyristor controlled reactor in series with a fixed inductance. The output frequency is regulated thanks to the TCR branch by compensating either the excess or the lack of the reactive power system which depends on the load conditions and on the prime mover. This control method was preceded by a static steady method that have determined accurately the required excitation capacitor value for each desired load power. The control strategy is implemented using MATLAB/Simulink.
{"title":"Self excited induction generator using a thyristor controlled reactor: Frequency regulation and reactive power compensation","authors":"D. Chermiti, A. Khedher","doi":"10.1109/STA.2014.7086709","DOIUrl":"https://doi.org/10.1109/STA.2014.7086709","url":null,"abstract":"This paper presents a loaded SEIG system controlled by a FC-TCR which consists of a big fixed capacitor in parallel with a thyristor controlled reactor in series with a fixed inductance. The output frequency is regulated thanks to the TCR branch by compensating either the excess or the lack of the reactive power system which depends on the load conditions and on the prime mover. This control method was preceded by a static steady method that have determined accurately the required excitation capacitor value for each desired load power. The control strategy is implemented using MATLAB/Simulink.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123426203","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 : 2014-12-01DOI: 10.1109/STA.2014.7086715
Jaouher Ben Ali, L. Saidi, B. Chebel-Morello, F. Fnaiech
Accurate Remaining Useful Life (RUL) prediction of critical assets is an important challenge in condition based maintenance to improve reliability and to decrease machine's breakdown and maintenance's cost. Bearing is one of the most important components in industries that need to be monitored and the user should predict its RUL. The challenge of this study is to propose a new strategy for RUL feature extraction. The proposed methodology provides better features in term of monotonicity. This specification ensures a better RUL prediction by comparing the test degradation features to the library of instance. Experimental results show that the proposed methodology is very promising for RUL estimation by industry.
{"title":"A new enhanced feature extraction strategy for bearing Remaining Useful Life estimation","authors":"Jaouher Ben Ali, L. Saidi, B. Chebel-Morello, F. Fnaiech","doi":"10.1109/STA.2014.7086715","DOIUrl":"https://doi.org/10.1109/STA.2014.7086715","url":null,"abstract":"Accurate Remaining Useful Life (RUL) prediction of critical assets is an important challenge in condition based maintenance to improve reliability and to decrease machine's breakdown and maintenance's cost. Bearing is one of the most important components in industries that need to be monitored and the user should predict its RUL. The challenge of this study is to propose a new strategy for RUL feature extraction. The proposed methodology provides better features in term of monotonicity. This specification ensures a better RUL prediction by comparing the test degradation features to the library of instance. Experimental results show that the proposed methodology is very promising for RUL estimation by industry.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"204 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122179620","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 : 2014-12-01DOI: 10.1109/STA.2014.7086765
Mohamed Sadok Ben Ameur, A. Sakly, A. Mtibaa
In this paper, a parallel PSO algorithm structure based on (FSM) Finite state machine is proposed. The use of FPGA (Field Programmable Gate Array) has shown many advantages over other circuits based on swarm intelligence mainly due to its simplicity and robustness to solve mathematic problems that contain several variables. This paper evaluates the performance of the PSO that's why we developed a hardware architecture that accelerates its execution performance by updating velocity and position of particles. The fitness evaluation module is implemented and mapped into FPGA reconfigurable hardware. The accelerated execution performance of the proposed architecture is demonstrated on standard mathematical functions as well as on a real coded problem.
{"title":"Implementation of real coded PSO algorithms using FPGA technology","authors":"Mohamed Sadok Ben Ameur, A. Sakly, A. Mtibaa","doi":"10.1109/STA.2014.7086765","DOIUrl":"https://doi.org/10.1109/STA.2014.7086765","url":null,"abstract":"In this paper, a parallel PSO algorithm structure based on (FSM) Finite state machine is proposed. The use of FPGA (Field Programmable Gate Array) has shown many advantages over other circuits based on swarm intelligence mainly due to its simplicity and robustness to solve mathematic problems that contain several variables. This paper evaluates the performance of the PSO that's why we developed a hardware architecture that accelerates its execution performance by updating velocity and position of particles. The fitness evaluation module is implemented and mapped into FPGA reconfigurable hardware. The accelerated execution performance of the proposed architecture is demonstrated on standard mathematical functions as well as on a real coded problem.","PeriodicalId":125957,"journal":{"name":"2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126115623","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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