Pub Date : 2016-09-05DOI: 10.1109/ICMA.2016.7558650
K. Xia, Yanhua Sun, Dejiang Hong, Jiafang Guo, Xianju Kang
The contact interfaces for the rod-fastened rotor of a heavy-duty gas turbine rotor were analyzed and classified into three kinds. In order to predict the effects of contact interfaces on the rotor dynamic characteristics of the heavy-duty gas turbine generator set, the torsional characteristics of the contact segments were studied firstly. The piecewise bilinear torsional deformation model for the contact segments was proposed through theoretical analysis, and was validated with 3D finite element model of the contact segments. Secondly, the bilinear torsional stiffness was obtained using finite element method. And the effects of the preload of the tie-bolts and friction coefficient of the contact interface on the bilinear torsional stiffness were studied. Results show that the preload almost has no effect on the bilinear torsional stiffness. The friction coefficient increases the first linear torsional stiffness obviously, but can decrease the second one slightly. Finally, the first linear torsional stiffness correction coefficients of the contact segments were used to modify the equation of rotor rotation established with finite element based on Timoshenko beam element and lumped element. And the first three torsional natural frequencies were calculated and compared with the results obtained with the unmodified rotor without considering the contact effects.
{"title":"Effects of contact interfaces on rotor dynamic characteristics of heavy-duty gas turbine generator set","authors":"K. Xia, Yanhua Sun, Dejiang Hong, Jiafang Guo, Xianju Kang","doi":"10.1109/ICMA.2016.7558650","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558650","url":null,"abstract":"The contact interfaces for the rod-fastened rotor of a heavy-duty gas turbine rotor were analyzed and classified into three kinds. In order to predict the effects of contact interfaces on the rotor dynamic characteristics of the heavy-duty gas turbine generator set, the torsional characteristics of the contact segments were studied firstly. The piecewise bilinear torsional deformation model for the contact segments was proposed through theoretical analysis, and was validated with 3D finite element model of the contact segments. Secondly, the bilinear torsional stiffness was obtained using finite element method. And the effects of the preload of the tie-bolts and friction coefficient of the contact interface on the bilinear torsional stiffness were studied. Results show that the preload almost has no effect on the bilinear torsional stiffness. The friction coefficient increases the first linear torsional stiffness obviously, but can decrease the second one slightly. Finally, the first linear torsional stiffness correction coefficients of the contact segments were used to modify the equation of rotor rotation established with finite element based on Timoshenko beam element and lumped element. And the first three torsional natural frequencies were calculated and compared with the results obtained with the unmodified rotor without considering the contact effects.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126979342","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 : 2016-09-05DOI: 10.1109/ICMA.2016.7558862
Jing Jin, Yixiao Liu, Xiaoyu Li, Yi Shen, Liangwei Huang
Since the pulsar is far away from the earth and the signal is weak, it is hard to detect the radiated photons of the pulsar on the ground. Thus the most effective and feasible method of signal generation is to use mathematical model to simulate it. In this paper, a signal simulated method for X-ray pulsar based on Monte Carlo is proposed, which improves the method of probability statistics and overcomes the constraint of non-homogeneous Poisson distribution. The probability density function can be obtained by fitting the pulsar radiation flow curve, and numerical comparison is used to select the generated random number to meet the requirements of probability density. The simulation results show that, the proposed method is utilized with a random thought, based on which the complex problem can be solved by simple numerical comparison. Compared with the Poisson based and Gauss based model, the proposed method has such advantages, including less simulation time, higher efficiency and greater precision.
{"title":"A simulation method for X-ray pulsar signal based on Monte Carlo","authors":"Jing Jin, Yixiao Liu, Xiaoyu Li, Yi Shen, Liangwei Huang","doi":"10.1109/ICMA.2016.7558862","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558862","url":null,"abstract":"Since the pulsar is far away from the earth and the signal is weak, it is hard to detect the radiated photons of the pulsar on the ground. Thus the most effective and feasible method of signal generation is to use mathematical model to simulate it. In this paper, a signal simulated method for X-ray pulsar based on Monte Carlo is proposed, which improves the method of probability statistics and overcomes the constraint of non-homogeneous Poisson distribution. The probability density function can be obtained by fitting the pulsar radiation flow curve, and numerical comparison is used to select the generated random number to meet the requirements of probability density. The simulation results show that, the proposed method is utilized with a random thought, based on which the complex problem can be solved by simple numerical comparison. Compared with the Poisson based and Gauss based model, the proposed method has such advantages, including less simulation time, higher efficiency and greater precision.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116798070","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 : 2016-09-05DOI: 10.1109/ICMA.2016.7558677
Qing Shi, Jin Zhao, Lei Han, You Ning, Guangwei Wang
Large amounts of information can be obtained from road images by computer vision. This paper presents a vision-based lane detection algorithm to find the lane curves in each video frame, while a multi-model fuzzy controller is also established to fulfill lane following, which is based on fuzzy logic. In the proposed detecting algorithm, a series of algorithms, including image preprocessing and lane extraction algorithm, are done to extract the edge features, then lane-fitting is done successfully inside the region of interest(ROI) based on the coordinate transformation. Furthermore, some real-time simulation tests had been done successfully for verification, and the lateral position error was calculated. Meanwhile, the multi-model fuzzy controller, which inherits the advantages of both the multi-model control and fuzzy control, has been used at a low speed. In the end, the integrated simulation results validate the good tracking performance of this algorithm.
{"title":"Dynamic lane tracking system based on multi-model fuzzy controller","authors":"Qing Shi, Jin Zhao, Lei Han, You Ning, Guangwei Wang","doi":"10.1109/ICMA.2016.7558677","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558677","url":null,"abstract":"Large amounts of information can be obtained from road images by computer vision. This paper presents a vision-based lane detection algorithm to find the lane curves in each video frame, while a multi-model fuzzy controller is also established to fulfill lane following, which is based on fuzzy logic. In the proposed detecting algorithm, a series of algorithms, including image preprocessing and lane extraction algorithm, are done to extract the edge features, then lane-fitting is done successfully inside the region of interest(ROI) based on the coordinate transformation. Furthermore, some real-time simulation tests had been done successfully for verification, and the lateral position error was calculated. Meanwhile, the multi-model fuzzy controller, which inherits the advantages of both the multi-model control and fuzzy control, has been used at a low speed. In the end, the integrated simulation results validate the good tracking performance of this algorithm.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115610277","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 : 2016-09-05DOI: 10.1109/ICMA.2016.7558729
Yanbin Xu, Chenguang Yang, P. Liang, Lijun Zhao, Zhijun Li
In this paper, we have developed a motion capture method based on data collected by MYO armband. The method can be applied on any healthy operator wearing two MYO armbands on both upper and lower arms, respectively. The first MYO armband is worn near the centre of the operator's upper arm, the other is worn near the centre of the forearm. MYO armband has built-in eight bioelectrical sensors as well as a 9-axis IMU. The IMU sensors of the MYO are used to detect and reconstruct physical motion of shoulder and elbow joints, while the bioelectrical sensors are used to collect electromyography (EMG) signals associated with wrist motion. This hybrid method enable us to fully capture the motion of the 6-DOF (degree of freedom) of the arm. To test the proposed method, hardware-in-loop simulations studies are performed, with both physiological and physical signals received and processed in MATLAB/Simulink via a low-power bluetooth interface. Results demonstrate the validness and effectiveness of the proposed method.
{"title":"Development of a hybrid motion capture method using MYO armband with application to teleoperation","authors":"Yanbin Xu, Chenguang Yang, P. Liang, Lijun Zhao, Zhijun Li","doi":"10.1109/ICMA.2016.7558729","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558729","url":null,"abstract":"In this paper, we have developed a motion capture method based on data collected by MYO armband. The method can be applied on any healthy operator wearing two MYO armbands on both upper and lower arms, respectively. The first MYO armband is worn near the centre of the operator's upper arm, the other is worn near the centre of the forearm. MYO armband has built-in eight bioelectrical sensors as well as a 9-axis IMU. The IMU sensors of the MYO are used to detect and reconstruct physical motion of shoulder and elbow joints, while the bioelectrical sensors are used to collect electromyography (EMG) signals associated with wrist motion. This hybrid method enable us to fully capture the motion of the 6-DOF (degree of freedom) of the arm. To test the proposed method, hardware-in-loop simulations studies are performed, with both physiological and physical signals received and processed in MATLAB/Simulink via a low-power bluetooth interface. Results demonstrate the validness and effectiveness of the proposed method.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129098397","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 : 2016-09-05DOI: 10.1109/ICMA.2016.7558789
Yi Shen, Shengyuan Jiang, Chuanxi Xu, Weiwei Zhang, Xiang Wu
The impact type penetrator is a compact, lightweight and low power consumption device, using internal hammering mechanism to move downward by compaction of lunar soil in space exploration. This paper proposes an optimal design method for the impact type penetrator. The method main to optimize the structure parameters for housing element (M2), suppressor element (M0) and hammer element (M1) of the penetrator. First of all, to realize optimal structure parameters of the penetrator, dynamic model of the penetrator have to be established. Secondly, through analyzing the whole movement process of the penetrator and dynamic modeling of the penetrator. In the end, The optimization results can be obtained base on the frame work of the proposed method. The paper presents results show that the displacement of housing element is varied with every structure parameters.
{"title":"Study on optimization of structure parameters to the penetrator","authors":"Yi Shen, Shengyuan Jiang, Chuanxi Xu, Weiwei Zhang, Xiang Wu","doi":"10.1109/ICMA.2016.7558789","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558789","url":null,"abstract":"The impact type penetrator is a compact, lightweight and low power consumption device, using internal hammering mechanism to move downward by compaction of lunar soil in space exploration. This paper proposes an optimal design method for the impact type penetrator. The method main to optimize the structure parameters for housing element (M2), suppressor element (M0) and hammer element (M1) of the penetrator. First of all, to realize optimal structure parameters of the penetrator, dynamic model of the penetrator have to be established. Secondly, through analyzing the whole movement process of the penetrator and dynamic modeling of the penetrator. In the end, The optimization results can be obtained base on the frame work of the proposed method. The paper presents results show that the displacement of housing element is varied with every structure parameters.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129718257","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 : 2016-09-05DOI: 10.1109/ICMA.2016.7558881
Shuyou Yu, Yan Wang, Jing Wang, Hong Chen
In this paper, control of liquid level for a four-tank system with respect to disturbances is studied, where constrained output feedback H∞ control of linear systems based on linear matrix inequality is adopted. In contrast, both an unconstrained H∞ controller and decentralized PID controllers are applied to the four-tank system. The simulation results illustrate the effectiveness of constrained output feedback H∞ control strategy.
{"title":"Constrained output feedback H∞ control of a four-tank system","authors":"Shuyou Yu, Yan Wang, Jing Wang, Hong Chen","doi":"10.1109/ICMA.2016.7558881","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558881","url":null,"abstract":"In this paper, control of liquid level for a four-tank system with respect to disturbances is studied, where constrained output feedback H<sub>∞</sub> control of linear systems based on linear matrix inequality is adopted. In contrast, both an unconstrained H<sub>∞</sub> controller and decentralized PID controllers are applied to the four-tank system. The simulation results illustrate the effectiveness of constrained output feedback H<sub>∞</sub> control strategy.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127991195","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 : 2016-09-05DOI: 10.1109/ICMA.2016.7558934
Yinyu Zhan, Jiahao Deng, Yong Ye, Shichuang Liu, Yuting Liu
Aimed at the accurate measurement of high-speed motion targets in Active Protection System, a capacitive analytic approach, based on complex variable method, was proposed for the planar capacitive coupling sensor working in quasi-electrostatic field. This approach, applying to analyze symmetry model, needs little calculation and more accurate. It directly reflects the relation between the capacitance and electrode structural parameters. The results show that increasing electrode diameter has a major influence on improving the sensitivity, and electrode spacing has no significant effect. Proper electrode spacing needs to be selected in order to meet the detection range and distance. A good agreement was obtained by the comparison of the theoretical results, experiment results and simulation results. These results contribute the experiment schemes improvement and optimization in the future work.
{"title":"Finite element simulation and capacitive analysis on coupling capacitor using complex variable method of quasi-electrostatic field","authors":"Yinyu Zhan, Jiahao Deng, Yong Ye, Shichuang Liu, Yuting Liu","doi":"10.1109/ICMA.2016.7558934","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558934","url":null,"abstract":"Aimed at the accurate measurement of high-speed motion targets in Active Protection System, a capacitive analytic approach, based on complex variable method, was proposed for the planar capacitive coupling sensor working in quasi-electrostatic field. This approach, applying to analyze symmetry model, needs little calculation and more accurate. It directly reflects the relation between the capacitance and electrode structural parameters. The results show that increasing electrode diameter has a major influence on improving the sensitivity, and electrode spacing has no significant effect. Proper electrode spacing needs to be selected in order to meet the detection range and distance. A good agreement was obtained by the comparison of the theoretical results, experiment results and simulation results. These results contribute the experiment schemes improvement and optimization in the future work.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124704409","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}
In order to solve the problem that the echo dynamic range is far greater than the range of the linear amplifier, this paper presents a short-range dynamic laser echo ranging approach. This method could generate wave by the FPGA and high speed DAC circuit, and then the STC (sensitivity time control) circuit could weaken the influence of the large echo dynamic range. Theoretical calculation and experimental results show that this scheme can be used for short-range laser radar echo processing, which not only can extend the distance of the dynamic range, but also can improve accuracy ranging. This method would be widely used in short-range laser radar systems.
{"title":"Short-range dynamic gain control for laser radar","authors":"Dong Xiang, Wenfei Dong, Mingfeng Ge, Xiangcheng Chen","doi":"10.1109/ICMA.2016.7558639","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558639","url":null,"abstract":"In order to solve the problem that the echo dynamic range is far greater than the range of the linear amplifier, this paper presents a short-range dynamic laser echo ranging approach. This method could generate wave by the FPGA and high speed DAC circuit, and then the STC (sensitivity time control) circuit could weaken the influence of the large echo dynamic range. Theoretical calculation and experimental results show that this scheme can be used for short-range laser radar echo processing, which not only can extend the distance of the dynamic range, but also can improve accuracy ranging. This method would be widely used in short-range laser radar systems.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131463357","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 : 2016-09-05DOI: 10.1109/ICMA.2016.7558629
Zhiqiang Gao, Song Li, Xuesong Zhou, Youjie Ma
Photovoltaic power generation system (PV system) is a device which changes the solar power into the electricity by solar cells and the principle of the solar cells is the use of semiconductor materials electronics characteristics of P-V conversion. PV system and its application is a profound research project, facing the 21st century, which gathers the utilization of green renewable energy, improve the ecological environment, ameliorate people's living conditions as integral whole will be of great benefits to economy, politics, coupled with society, and also contains rich academic studies value and the basic theory issues. This paper expounds the background and significance of PV system, discusses the forefront of the technologies which contains maximum power point tracking, islanding phenomenon, inverter that PV system is facing and makes a conclusion.
{"title":"An overview of PV system","authors":"Zhiqiang Gao, Song Li, Xuesong Zhou, Youjie Ma","doi":"10.1109/ICMA.2016.7558629","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558629","url":null,"abstract":"Photovoltaic power generation system (PV system) is a device which changes the solar power into the electricity by solar cells and the principle of the solar cells is the use of semiconductor materials electronics characteristics of P-V conversion. PV system and its application is a profound research project, facing the 21st century, which gathers the utilization of green renewable energy, improve the ecological environment, ameliorate people's living conditions as integral whole will be of great benefits to economy, politics, coupled with society, and also contains rich academic studies value and the basic theory issues. This paper expounds the background and significance of PV system, discusses the forefront of the technologies which contains maximum power point tracking, islanding phenomenon, inverter that PV system is facing and makes a conclusion.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127998104","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 : 2016-09-01DOI: 10.1109/ICMA.2016.7558776
M. Ramli, Xinkai Chen
Hard nonlinearity or hysteresis effect is the main obstacle in most smart material based actuators which makes their optimal usage impossible. Thus, it is essential to develop a comprehensive strategy for modeling and control in order to mitigate this hysteresis nonlinearity. This paper investigates the viability of the differential equations based models towards hysteresis characterization and control fusion strategy in order to solve the tracking problem in the piezoelectric-based actuators. The analytical and simulation results suggest that this category of model is simple to use and has clear physical meanings. More importantly, it is established that only Bouc-Wen (BW) model has the ability to be synthesized directly into the control design. Finally, a control strategy is devised based on BW model and is experimentally verified in the discrete-time domain.
{"title":"Control fusion strategy via differential equations based hysteresis operator","authors":"M. Ramli, Xinkai Chen","doi":"10.1109/ICMA.2016.7558776","DOIUrl":"https://doi.org/10.1109/ICMA.2016.7558776","url":null,"abstract":"Hard nonlinearity or hysteresis effect is the main obstacle in most smart material based actuators which makes their optimal usage impossible. Thus, it is essential to develop a comprehensive strategy for modeling and control in order to mitigate this hysteresis nonlinearity. This paper investigates the viability of the differential equations based models towards hysteresis characterization and control fusion strategy in order to solve the tracking problem in the piezoelectric-based actuators. The analytical and simulation results suggest that this category of model is simple to use and has clear physical meanings. More importantly, it is established that only Bouc-Wen (BW) model has the ability to be synthesized directly into the control design. Finally, a control strategy is devised based on BW model and is experimentally verified in the discrete-time domain.","PeriodicalId":260197,"journal":{"name":"2016 IEEE International Conference on Mechatronics and Automation","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127213004","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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