Pub Date : 2016-10-01DOI: 10.1109/ICICPI.2016.7859691
Koushik Chatterjee, Arnab Ghosh, P. Saha, Arup Das
This paper reflects the study of a Power-Factor-Correction (PFC) boost converter's nonlinearity. A peak current controlled boost converter is simulated in continuous conduction mode (CCM) to study the dynamics through the bifurcation diagrams. The study shows that with changes of certain parameters the bifurcation and chaotic state may occur. The bifurcation diagrams indicate the stable zone of various parameters of the circuit which is desired to be selected. The bifurcation map is obtained by varying input voltage and reference current as variable. Discrete state space has also been considered for observing the periodicities of state variables and detecting the route to chaos.
{"title":"An analysis of power-factor-correction boost converter's nonlinear dynamics through bifurcation diagrams","authors":"Koushik Chatterjee, Arnab Ghosh, P. Saha, Arup Das","doi":"10.1109/ICICPI.2016.7859691","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859691","url":null,"abstract":"This paper reflects the study of a Power-Factor-Correction (PFC) boost converter's nonlinearity. A peak current controlled boost converter is simulated in continuous conduction mode (CCM) to study the dynamics through the bifurcation diagrams. The study shows that with changes of certain parameters the bifurcation and chaotic state may occur. The bifurcation diagrams indicate the stable zone of various parameters of the circuit which is desired to be selected. The bifurcation map is obtained by varying input voltage and reference current as variable. Discrete state space has also been considered for observing the periodicities of state variables and detecting the route to chaos.","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"223 1","pages":"142-147"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76994873","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 : 2016-10-01DOI: 10.1109/ICICPI.2016.7859671
Sanjeevani Bhardwaj, Alok Kole
Internet of things represents a groundbreaking vision of technological, economic and social significance. This paper is designed to help technology enthusiasts navigate the dialogue surrounding the same, be well versed in IoT and understand its potential to change everything we know to be true today. In this new era of technology, Internet of Things (IoT) has the true potential to make computing ubiquitous — a concept introduced by Mark Weiser in early 1990s. Machine to machine, computer to objects, environment to computers, intelligent systems — “The internet of everything”, is where the potential seems to be endless. IoT can be seen as a universal global neural network of connected things in the cloud where smart machines interact and communicate with other machines, objects, infrastructure and the environment. As a result of which, exponential amount of data is generated and processed into actions that has the ability to command and control things making our everyday life much easier. This paper concludes with a discussion around social and commercial issues likely to surface when Internet of Things becomes a household reality.
{"title":"Review and study of internet of things: It's the future","authors":"Sanjeevani Bhardwaj, Alok Kole","doi":"10.1109/ICICPI.2016.7859671","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859671","url":null,"abstract":"Internet of things represents a groundbreaking vision of technological, economic and social significance. This paper is designed to help technology enthusiasts navigate the dialogue surrounding the same, be well versed in IoT and understand its potential to change everything we know to be true today. In this new era of technology, Internet of Things (IoT) has the true potential to make computing ubiquitous — a concept introduced by Mark Weiser in early 1990s. Machine to machine, computer to objects, environment to computers, intelligent systems — “The internet of everything”, is where the potential seems to be endless. IoT can be seen as a universal global neural network of connected things in the cloud where smart machines interact and communicate with other machines, objects, infrastructure and the environment. As a result of which, exponential amount of data is generated and processed into actions that has the ability to command and control things making our everyday life much easier. This paper concludes with a discussion around social and commercial issues likely to surface when Internet of Things becomes a household reality.","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"83 1","pages":"47-50"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77136325","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 : 2016-10-01DOI: 10.1109/ICICPI.2016.7859692
V. R. Babu, T. Maity, Somnath Burman
This paper presents the issue of maximum energy consumption of mine ventilation fan and proposes an optimization technique based control system that enhances the savings of energy, operating performance providing a healthy atmosphere for the miners. It utilizes particle swarm optimization (PSO) algorithm for the feedback speed control facilitating with variable speed drives (VSD) based on current status of airflow and air pressure in underground coal mines. It also utilizes the overlapping hour format to control energy use. The system is developed in MATLAB environment and the both steady and dynamic behavior of the system are tested successfully.
{"title":"Optimization of energy use for mine ventilation fan with variable speed drive","authors":"V. R. Babu, T. Maity, Somnath Burman","doi":"10.1109/ICICPI.2016.7859692","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859692","url":null,"abstract":"This paper presents the issue of maximum energy consumption of mine ventilation fan and proposes an optimization technique based control system that enhances the savings of energy, operating performance providing a healthy atmosphere for the miners. It utilizes particle swarm optimization (PSO) algorithm for the feedback speed control facilitating with variable speed drives (VSD) based on current status of airflow and air pressure in underground coal mines. It also utilizes the overlapping hour format to control energy use. The system is developed in MATLAB environment and the both steady and dynamic behavior of the system are tested successfully.","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"169 1","pages":"148-151"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87963027","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 : 2016-10-01DOI: 10.1109/ICICPI.2016.7859676
Sangita Das, S. Pal, M. Mitra
In this paper a Photoplethysmography (PPG) based noise robust real time heart rate measurement technique is proposed. It has been developed using Arduino Uno board based on 8-bit AVR core microcontroller and having 16 MHz clock frequency. The basic idea of the proposed work is to extract the periodic PPG signal contaminated by non-periodic noise and atrifact. The algorithm is based on short term autocorrelation technique over the time shifted PPG signal. The algorithm and the developed system is validated against the heart rates derived from the signals acquired in BIOPAC MP150 data acquisition system. The designed system is highly noise robust and it can detect heart rate with almost 0% error considering BIOPAC MP150 as a standard.
{"title":"Real time heart rate detection from PPG signal in noisy environment","authors":"Sangita Das, S. Pal, M. Mitra","doi":"10.1109/ICICPI.2016.7859676","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859676","url":null,"abstract":"In this paper a Photoplethysmography (PPG) based noise robust real time heart rate measurement technique is proposed. It has been developed using Arduino Uno board based on 8-bit AVR core microcontroller and having 16 MHz clock frequency. The basic idea of the proposed work is to extract the periodic PPG signal contaminated by non-periodic noise and atrifact. The algorithm is based on short term autocorrelation technique over the time shifted PPG signal. The algorithm and the developed system is validated against the heart rates derived from the signals acquired in BIOPAC MP150 data acquisition system. The designed system is highly noise robust and it can detect heart rate with almost 0% error considering BIOPAC MP150 as a standard.","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"23 5","pages":"70-73"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91404726","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 : 2016-10-01DOI: 10.1109/ICICPI.2016.7859690
M. Das, P. Bera, P. Sarkar
The paper presents the application of proportional-integral (P-I) Controller for the discrete mode Automatic Generation Control (AGC) problems in the deregulated environment. Governor dead-band non-linearity has been considered in a two area deregulated power system while designing the P-I controller. Imperialist Competitive Algorithm (ICA) has been used for optimizing the gains of P-I controller and the dynamics responses are compared with and without considering optimized values of the controller gains. Simulation results show that P-I controller optimized using ICA gives better dynamic performances compared to P-I controller without optimized using ICA.
{"title":"Discrete mode AGC of restructured power system using P-I controller with governor dead-band nonlinearity","authors":"M. Das, P. Bera, P. Sarkar","doi":"10.1109/ICICPI.2016.7859690","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859690","url":null,"abstract":"The paper presents the application of proportional-integral (P-I) Controller for the discrete mode Automatic Generation Control (AGC) problems in the deregulated environment. Governor dead-band non-linearity has been considered in a two area deregulated power system while designing the P-I controller. Imperialist Competitive Algorithm (ICA) has been used for optimizing the gains of P-I controller and the dynamics responses are compared with and without considering optimized values of the controller gains. Simulation results show that P-I controller optimized using ICA gives better dynamic performances compared to P-I controller without optimized using ICA.","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"1 1","pages":"137-141"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79209219","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 : 2016-10-01DOI: 10.1109/ICICPI.2016.7859666
Amit Khan, Barnali Chatterjee, C. Dey
A self-tuning fuzzy PID controller (STFPID) is developed to enhance the performance of an inverted pendulum in crane mode operation. Efficacy of STFPID is justified against the performance of a conventional PID and fuzzy PID controller (FPID). Inverted pendulum is a typical example of a nonlinear system and its free hanging mode is a well accepted form to realize a usual crane operation. Here, STFPID is designed with a continuous variation of its output scaling factor depending on the latest process status. Simulation study along with real time experimentation justifies the superiority of STFPID in comparison with conventional PID and FPID. Moreover, performance of STFPID is found to be more robust in comparison with conventional and fuzzy PID controllers.
{"title":"Real time performance evaluation of a self-tuning fuzzy PID controller on an inverted pendulum in crane mode operation","authors":"Amit Khan, Barnali Chatterjee, C. Dey","doi":"10.1109/ICICPI.2016.7859666","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859666","url":null,"abstract":"A self-tuning fuzzy PID controller (STFPID) is developed to enhance the performance of an inverted pendulum in crane mode operation. Efficacy of STFPID is justified against the performance of a conventional PID and fuzzy PID controller (FPID). Inverted pendulum is a typical example of a nonlinear system and its free hanging mode is a well accepted form to realize a usual crane operation. Here, STFPID is designed with a continuous variation of its output scaling factor depending on the latest process status. Simulation study along with real time experimentation justifies the superiority of STFPID in comparison with conventional PID and FPID. Moreover, performance of STFPID is found to be more robust in comparison with conventional and fuzzy PID controllers.","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"16 1","pages":"22-26"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89869944","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 : 2016-10-01DOI: 10.1109/ICICPI.2016.7859686
T. Chatterjee, R. B. Roy, B. Tudu, R. Bandyopadhyay, P. Pramanik, N. Bhattacharyya
Catechin plays a significant role in determining the level of astringency and taste of green tea. It has also certain health benefits which makes green tea very popular among mankind. This study reports the use of stainless steel electrode for the detection of catechin. The sensory evaluation of the electrode was compared with that of carbon paste and platinum electrode by means of cyclic voltammetry. The electrode also showed good linearity over the concentration range 1 to 10μM having R2 value of 0.99. Real tea samples are also explored herein to ascertain the performance of the electrode.
{"title":"Voltammetric determination of catechins in green tea using stainless steel electrode","authors":"T. Chatterjee, R. B. Roy, B. Tudu, R. Bandyopadhyay, P. Pramanik, N. Bhattacharyya","doi":"10.1109/ICICPI.2016.7859686","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859686","url":null,"abstract":"Catechin plays a significant role in determining the level of astringency and taste of green tea. It has also certain health benefits which makes green tea very popular among mankind. This study reports the use of stainless steel electrode for the detection of catechin. The sensory evaluation of the electrode was compared with that of carbon paste and platinum electrode by means of cyclic voltammetry. The electrode also showed good linearity over the concentration range 1 to 10μM having R2 value of 0.99. Real tea samples are also explored herein to ascertain the performance of the electrode.","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"26 1","pages":"118-121"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81301149","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 : 2016-10-01DOI: 10.1109/ICICPI.2016.7859672
Somdeb Chanda, Ashmita De, B. Tudu, R. Bandyopadhyay, A. K. Hazarika, S. Sabhapondit, B. D. Baruah, P. Tamuly, Nabarun Bhattachryya
Total polyphenol contents in tea leaves estimation have been presented by the near infrared reflectance (NIR) spectroscopy. In order to calibrate the regression model on NIR tea spectra partial least squares (PLS) algorithm was used. The number of PLS factors and the choice of preprocessing methods were optimized simultaneously by leave-one-sample out cross-validation during the model calibration. The efficacy of the model developed was evaluated by the root mean square error of prediction (RMSEP), root mean square error of cross-validation (RMSECV) and correlation coefficient (R). The correlation coefficients (R) in the prediction set is 0.95. Results showed that NIR spectroscopy with PLS algorithm can be used to analyze the content of polyphenol in tea leaves.
{"title":"Prediction of polyphenol content in tea leaves using NIR spectroscopy","authors":"Somdeb Chanda, Ashmita De, B. Tudu, R. Bandyopadhyay, A. K. Hazarika, S. Sabhapondit, B. D. Baruah, P. Tamuly, Nabarun Bhattachryya","doi":"10.1109/ICICPI.2016.7859672","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859672","url":null,"abstract":"Total polyphenol contents in tea leaves estimation have been presented by the near infrared reflectance (NIR) spectroscopy. In order to calibrate the regression model on NIR tea spectra partial least squares (PLS) algorithm was used. The number of PLS factors and the choice of preprocessing methods were optimized simultaneously by leave-one-sample out cross-validation during the model calibration. The efficacy of the model developed was evaluated by the root mean square error of prediction (RMSEP), root mean square error of cross-validation (RMSECV) and correlation coefficient (R). The correlation coefficients (R) in the prediction set is 0.95. Results showed that NIR spectroscopy with PLS algorithm can be used to analyze the content of polyphenol in tea leaves.","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"5 1","pages":"51-55"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78846235","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 : 2016-10-01DOI: 10.1109/ICICPI.2016.7859699
H. Prasad, T. Maity
This paper presents a real-time performance evaluation of direct torque control (DTC) and regenerative braking control of improved z-source inverter fed induction motor drives using field programmable gate arrays (FPGA) based real-time digital simulator (RTDS). RTDS was built using Very High Speed Integrated Circuit Hardware Description Language (VHDL), composing it versatile and compact. The proposed design method was carried out in VHDL, based on MATLAB/Simulink model and also validates the utility of simulating a drive of typical complexity in real-time. The proposed model is executed at fixed time-step and fixed step solver of 10 μs and constant switching frequency is 5 KHz. The proposed design employs much advancement to execute the functional blocks in DTC and regenerative braking that reduce the execution time. The proposed DTC drive technique is capable to change the wide range of motor speed from base speed to zero speed with full load torque. Real-time simulation results are certified the validity of the planned DTC drives and regenerative braking by MATLAB/Simulink interface using Xilinx SPARTAN-3 FPGA board of a 225 KW induction motor fed by the improved z-source inverter (ZSI).
{"title":"FPGA-based design and implementation of DTC and regenerative braking control of ZSI-Fed an induction motor drive","authors":"H. Prasad, T. Maity","doi":"10.1109/ICICPI.2016.7859699","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859699","url":null,"abstract":"This paper presents a real-time performance evaluation of direct torque control (DTC) and regenerative braking control of improved z-source inverter fed induction motor drives using field programmable gate arrays (FPGA) based real-time digital simulator (RTDS). RTDS was built using Very High Speed Integrated Circuit Hardware Description Language (VHDL), composing it versatile and compact. The proposed design method was carried out in VHDL, based on MATLAB/Simulink model and also validates the utility of simulating a drive of typical complexity in real-time. The proposed model is executed at fixed time-step and fixed step solver of 10 μs and constant switching frequency is 5 KHz. The proposed design employs much advancement to execute the functional blocks in DTC and regenerative braking that reduce the execution time. The proposed DTC drive technique is capable to change the wide range of motor speed from base speed to zero speed with full load torque. Real-time simulation results are certified the validity of the planned DTC drives and regenerative braking by MATLAB/Simulink interface using Xilinx SPARTAN-3 FPGA board of a 225 KW induction motor fed by the improved z-source inverter (ZSI).","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"1 1","pages":"184-188"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85912168","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 : 2016-10-01DOI: 10.1109/ICICPI.2016.7859695
M. Ravindra, R. S. Rao
This paper presents a new Binary Integer Linear Programming (BILP) approach considering modeling of zero injection constraints for optimal allocation of PMUs in the network and to generate dynamic state estimation solution in presence of load changes. Zero injection bus constraint modeling is considered to minimize the number of PMUs in the system. To find the dynamic behavior of power system in presence of load changes, a dynamic state estimation method integrating PMU and conventional measurements is proposed. The proposed dynamic state estimation method with optimal PMU allocations is compared with traditional Weighted Least Squares (WLS) state estimation method in presence of load changes. MATLAB simulations carried out on IEEE 14, 30, 57 and 118 bus systems and their results show the effectiveness of proposed method.
{"title":"Dynamic state estimation solution with optimal allocation of PMUs in presence of load changes","authors":"M. Ravindra, R. S. Rao","doi":"10.1109/ICICPI.2016.7859695","DOIUrl":"https://doi.org/10.1109/ICICPI.2016.7859695","url":null,"abstract":"This paper presents a new Binary Integer Linear Programming (BILP) approach considering modeling of zero injection constraints for optimal allocation of PMUs in the network and to generate dynamic state estimation solution in presence of load changes. Zero injection bus constraint modeling is considered to minimize the number of PMUs in the system. To find the dynamic behavior of power system in presence of load changes, a dynamic state estimation method integrating PMU and conventional measurements is proposed. The proposed dynamic state estimation method with optimal PMU allocations is compared with traditional Weighted Least Squares (WLS) state estimation method in presence of load changes. MATLAB simulations carried out on IEEE 14, 30, 57 and 118 bus systems and their results show the effectiveness of proposed method.","PeriodicalId":6501,"journal":{"name":"2016 International Conference on Intelligent Control Power and Instrumentation (ICICPI)","volume":"26 1","pages":"163-168"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90568801","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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