Pub Date : 2018-12-01DOI: 10.1109/ICCCAS.2018.8769277
Shiji Yuan, B. Qiu, Peng Yu, Yunsheng Yang, Huihui Sun
The interference between electronic equipment have become more and more serious with the extensive use of information equipment. In order to effectively solve the interference problem between electronic equipment, the paper use the receiver nonlinear coefficient method to quantitatively analyze and calculate the self-interference and mutual interference of electronic equipment. Then based on the genetic algorithm, the equipment frequency is optimized, and the genetic coding and adaptation are designed. Finally, the algorithm is used to simulate the frequency optimization of a small regional electronic equipment. The simulation experiment results show that the method provided by this paper can solve the frequency optimization problem of electronic equipment to a certain extent.
{"title":"Research on Frequency Optimization of Electronic Equipment Based on Nonlinear Coefficient","authors":"Shiji Yuan, B. Qiu, Peng Yu, Yunsheng Yang, Huihui Sun","doi":"10.1109/ICCCAS.2018.8769277","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8769277","url":null,"abstract":"The interference between electronic equipment have become more and more serious with the extensive use of information equipment. In order to effectively solve the interference problem between electronic equipment, the paper use the receiver nonlinear coefficient method to quantitatively analyze and calculate the self-interference and mutual interference of electronic equipment. Then based on the genetic algorithm, the equipment frequency is optimized, and the genetic coding and adaptation are designed. Finally, the algorithm is used to simulate the frequency optimization of a small regional electronic equipment. The simulation experiment results show that the method provided by this paper can solve the frequency optimization problem of electronic equipment to a certain extent.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117131683","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 : 2018-12-01DOI: 10.1109/ICCCAS.2018.8768917
Boyan Liu, He Gao, Guorong Zhao
Global Navigation Satellite System (GNSS) can not only provide the information in terms of location and time, but also the course angle of its carrier through the processing of multiple antennas and specific data. This orientation approach has the advantage of none accumulative error, and its orientation accuracy is high. In this article, a novel two-antenna orientation method is provided, where GPS/BeiDou(BD) satellite navigation system(SNS) is used to determine the course angle of aircraft. First, through the discussion of the satellite navigation system oriented method based on carrier phase, the GPS/BeiDou double difference combined observation model of GPS/BeiDou system is established, and the details of the proposed orientation method is put forward based on the carrier phase double difference data. Second, the integer ambiguity of the carrier phase is calculated through depth studied of the LAMBDA algorithm. Finally, the ambiguity resolution program and the course angle calculation program will be deduced, and these algorithms will be verified by simulation and hardware experiment system.
{"title":"LAMBDA Orientation Algorithm of Double-Antenna Based on GPS/BeiDou Navigation System","authors":"Boyan Liu, He Gao, Guorong Zhao","doi":"10.1109/ICCCAS.2018.8768917","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8768917","url":null,"abstract":"Global Navigation Satellite System (GNSS) can not only provide the information in terms of location and time, but also the course angle of its carrier through the processing of multiple antennas and specific data. This orientation approach has the advantage of none accumulative error, and its orientation accuracy is high. In this article, a novel two-antenna orientation method is provided, where GPS/BeiDou(BD) satellite navigation system(SNS) is used to determine the course angle of aircraft. First, through the discussion of the satellite navigation system oriented method based on carrier phase, the GPS/BeiDou double difference combined observation model of GPS/BeiDou system is established, and the details of the proposed orientation method is put forward based on the carrier phase double difference data. Second, the integer ambiguity of the carrier phase is calculated through depth studied of the LAMBDA algorithm. Finally, the ambiguity resolution program and the course angle calculation program will be deduced, and these algorithms will be verified by simulation and hardware experiment system.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128670187","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}
UHV direct current mixed-voltage transmission lines on the same tower can effectively solve the contradiction between growing power demand and resource shortage of power transmission corridors, thus doing research on the lightning protection performance of the transmission lines is of great significance. Based on EMTP-ATP, this paper presented an intersection method as insulation flashover criterion for insulator flashover simulation process, carried out analysis validation through examples, studied lightning back-flashover performances of two tower models and influencing factors thereof. By making comparison with ±800kV direct current single-circuit lines and ±500kV direct current double-circuit lines, this paper obtained characteristics of lightning protection performances of back-flashover of UHV direct current mixed-voltage transmission lines on the same tower. The results indicate that the 500kV lines are the weakness of back-flashover of the UHV direct current mixed-voltage double-circuit transmission lines, which require key protection.
{"title":"Research on Lightning Performance of Back-flashover of UHV Direct Current Double-circuit Mixed-voltage Transmission Lines on the Same Tower","authors":"Jinliang Li, Huisong Ren, Li Xu, Chenhai Long, Qi Yang, Yun Xiang","doi":"10.1109/ICCCAS.2018.8768968","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8768968","url":null,"abstract":"UHV direct current mixed-voltage transmission lines on the same tower can effectively solve the contradiction between growing power demand and resource shortage of power transmission corridors, thus doing research on the lightning protection performance of the transmission lines is of great significance. Based on EMTP-ATP, this paper presented an intersection method as insulation flashover criterion for insulator flashover simulation process, carried out analysis validation through examples, studied lightning back-flashover performances of two tower models and influencing factors thereof. By making comparison with ±800kV direct current single-circuit lines and ±500kV direct current double-circuit lines, this paper obtained characteristics of lightning protection performances of back-flashover of UHV direct current mixed-voltage transmission lines on the same tower. The results indicate that the 500kV lines are the weakness of back-flashover of the UHV direct current mixed-voltage double-circuit transmission lines, which require key protection.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114699573","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 : 2018-12-01DOI: 10.1109/ICCCAS.2018.8769333
G. Liao, Yang Xu
Aimed at the interference coordination problem after introducing the D2D communication technology to the cellular network, a mode selection and resource allocation algorithm based on interference control is proposed in this paper. With the interference threshold and the maximum communication distance as the variable, by interfering with control criterion, different modes are choosed by the size of the interference value of D2D communication and the resource channels are distributed. The simulation results show that the algorithm can achieve the maximum D2D communication number in the cell system, the minimum interference, and improveo resource allocation efficiency and D2D communication access efficiency.
{"title":"Mode Selection and Resource Allocation Algorithm Based on Interference Control for D2D Communication","authors":"G. Liao, Yang Xu","doi":"10.1109/ICCCAS.2018.8769333","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8769333","url":null,"abstract":"Aimed at the interference coordination problem after introducing the D2D communication technology to the cellular network, a mode selection and resource allocation algorithm based on interference control is proposed in this paper. With the interference threshold and the maximum communication distance as the variable, by interfering with control criterion, different modes are choosed by the size of the interference value of D2D communication and the resource channels are distributed. The simulation results show that the algorithm can achieve the maximum D2D communication number in the cell system, the minimum interference, and improveo resource allocation efficiency and D2D communication access efficiency.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114747573","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 : 2018-12-01DOI: 10.1109/ICCCAS.2018.8769315
P. Jha, B. Kumari, Manodipan Sahoo
In this work, we perform a comparative study of signal integrity (delay, noise and noise delay product) for three different intercalation doped, side contact (SC), Multi-Layer Graphene Nano-Ribbon (ML-GNR) interconnects. For the first time, crosstalk delay of Lithium (Li) intercalated ML-GNR is evaluated and compared with Arsenic Penta-Fluoride (AsF5) doped, Ferric Chloride (FeCl3) doped ML-GNRs and copper interconnects for both intermediate and global level interconnects at 8 nm technology node. It is observed that Li intercalated ML-GNRs have least crosstalk delay as compared to other intercalation doping with specularity index of (P=0.8) for both intermediate and global level interconnects. As far as noise is considered, Li, FeCl3 and AsF5 doped ML-GNR interconnects are comparable but copper interconnects is not a good recommendation for low noise applications. Therefore, our analytical report paves the way for Li intercalated ML-GNR as the next generation interconnect material for low delay applications.
{"title":"Investigation on the Impact of Various Intercalation Doping on the Signal Integrity in ML-GNR Interconnects","authors":"P. Jha, B. Kumari, Manodipan Sahoo","doi":"10.1109/ICCCAS.2018.8769315","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8769315","url":null,"abstract":"In this work, we perform a comparative study of signal integrity (delay, noise and noise delay product) for three different intercalation doped, side contact (SC), Multi-Layer Graphene Nano-Ribbon (ML-GNR) interconnects. For the first time, crosstalk delay of Lithium (Li) intercalated ML-GNR is evaluated and compared with Arsenic Penta-Fluoride (AsF5) doped, Ferric Chloride (FeCl3) doped ML-GNRs and copper interconnects for both intermediate and global level interconnects at 8 nm technology node. It is observed that Li intercalated ML-GNRs have least crosstalk delay as compared to other intercalation doping with specularity index of (P=0.8) for both intermediate and global level interconnects. As far as noise is considered, Li, FeCl3 and AsF5 doped ML-GNR interconnects are comparable but copper interconnects is not a good recommendation for low noise applications. Therefore, our analytical report paves the way for Li intercalated ML-GNR as the next generation interconnect material for low delay applications.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120938449","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 : 2018-12-01DOI: 10.1109/ICCCAS.2018.8768966
Yang Fan, Yang Chao, Xu Zhen, Tang Keran, Pang Youbing, Zhang Tianxing
A Miniaturization and Isolation CAN Bus communication system circuit based on 3D package is presented in this paper. This circuit brings the advanced stacked 3D package technology to makes the CAN BUS Controller, Isolator, CAN BUS Transceiver, Crystal Oscillator, Power Management and so on to bury in three PCB board, and forms the SIP package of 15mm*15mm*4mm. Compared with the general devices on the market, the circuit volume is reduced by 2/3.
{"title":"Design of a CAN Bus Communication System Based on 3D Package","authors":"Yang Fan, Yang Chao, Xu Zhen, Tang Keran, Pang Youbing, Zhang Tianxing","doi":"10.1109/ICCCAS.2018.8768966","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8768966","url":null,"abstract":"A Miniaturization and Isolation CAN Bus communication system circuit based on 3D package is presented in this paper. This circuit brings the advanced stacked 3D package technology to makes the CAN BUS Controller, Isolator, CAN BUS Transceiver, Crystal Oscillator, Power Management and so on to bury in three PCB board, and forms the SIP package of 15mm*15mm*4mm. Compared with the general devices on the market, the circuit volume is reduced by 2/3.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125265167","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 : 2018-12-01DOI: 10.1109/ICCCAS.2018.8769265
Guoqing Xia, W. Xia, Ming Xie, Huiyong Li
We propose a robust null broadening algorithm incorporated with the covariance matrix taper (CMT) for the dual-polarized sensitive arrays (DPSAs) in space-time domain to mitigate the performance degradation of traditional anti-jamming schemes in high dynamic scenarios. Compared to spatial null broadening for DPSAs, our proposed algorithm could suppress those wide-band interferences as well as narrow-band interferences, even if those interferences with the same azimuths and frequency bands as the desired navigation signals. Simulations verify the robustness and effectiveness of the proposed algorithm.
{"title":"A Robust GNSS Polarized Space-Time Anti-Interference Method Based on Null Broadening","authors":"Guoqing Xia, W. Xia, Ming Xie, Huiyong Li","doi":"10.1109/ICCCAS.2018.8769265","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8769265","url":null,"abstract":"We propose a robust null broadening algorithm incorporated with the covariance matrix taper (CMT) for the dual-polarized sensitive arrays (DPSAs) in space-time domain to mitigate the performance degradation of traditional anti-jamming schemes in high dynamic scenarios. Compared to spatial null broadening for DPSAs, our proposed algorithm could suppress those wide-band interferences as well as narrow-band interferences, even if those interferences with the same azimuths and frequency bands as the desired navigation signals. Simulations verify the robustness and effectiveness of the proposed algorithm.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124821404","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 : 2018-12-01DOI: 10.1109/ICCCAS.2018.8768938
Yongwen Fan, Weijun Zhu, ShaoHuan Ban, Junfeng Wang
Aiming at the security problem of traditional image encryption, this paper propose a mimic image encryption based on mimic defense try to improve the security of image encryption. Firstly, the encryption and decryption pools were built according to the working principle of mimic defense technology. Secondly, the redundancy execution bodies were dynamically scheduling through central controller. And the result of decryption were decided by consistency decision mechanism. The experimental results show that the new method can effectively improve the security of image encryption. And compared with traditional image encryption, the combination of consistency decision mechanism and dynamical scheduling make the new method more security.
{"title":"A New Method of Image Encryption Based on Mimic Defense","authors":"Yongwen Fan, Weijun Zhu, ShaoHuan Ban, Junfeng Wang","doi":"10.1109/ICCCAS.2018.8768938","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8768938","url":null,"abstract":"Aiming at the security problem of traditional image encryption, this paper propose a mimic image encryption based on mimic defense try to improve the security of image encryption. Firstly, the encryption and decryption pools were built according to the working principle of mimic defense technology. Secondly, the redundancy execution bodies were dynamically scheduling through central controller. And the result of decryption were decided by consistency decision mechanism. The experimental results show that the new method can effectively improve the security of image encryption. And compared with traditional image encryption, the combination of consistency decision mechanism and dynamical scheduling make the new method more security.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131175691","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 : 2018-12-01DOI: 10.1109/ICCCAS.2018.8769182
Ke Jiang, Ping Yang, Yue Xiao
In this paper, we design an implementation of a kind of reduced-complexity maximum likelihood (ML) detector for spatial modulation (SM) deployed in a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system. Based on National Instruments Universal Software Radio Peripheral (NI USRP) platform, two USRP Reconfigurable Input / Output (USRP-RIO) devices are used as the transmitter and the receiver. Error performance comparisons between the reduced-complexity ML detector and conventional ML detector are made in an indoor environment, as well as the comparison between SM scheme and space-frequency block code (SFBC) scheme. 6 different pictures are exploited as transmitted data, and are reconstructed in the receiver side, so the performance of each scheme is taken on the reconstructed pictures. Both of the calculated bit error ratio (BER) and the reconstruction result of each transmitted pictures, validate the highly consistent error performance of HL_ML detector and conventional ML detector, as well as the error performance superiority of SM over SFBC.
{"title":"Implementation of Reduced-Complexity ML Detector for Spatial Modulation System","authors":"Ke Jiang, Ping Yang, Yue Xiao","doi":"10.1109/ICCCAS.2018.8769182","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8769182","url":null,"abstract":"In this paper, we design an implementation of a kind of reduced-complexity maximum likelihood (ML) detector for spatial modulation (SM) deployed in a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system. Based on National Instruments Universal Software Radio Peripheral (NI USRP) platform, two USRP Reconfigurable Input / Output (USRP-RIO) devices are used as the transmitter and the receiver. Error performance comparisons between the reduced-complexity ML detector and conventional ML detector are made in an indoor environment, as well as the comparison between SM scheme and space-frequency block code (SFBC) scheme. 6 different pictures are exploited as transmitted data, and are reconstructed in the receiver side, so the performance of each scheme is taken on the reconstructed pictures. Both of the calculated bit error ratio (BER) and the reconstruction result of each transmitted pictures, validate the highly consistent error performance of HL_ML detector and conventional ML detector, as well as the error performance superiority of SM over SFBC.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130947363","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 : 2018-12-01DOI: 10.1109/ICCCAS.2018.8769332
Xiaofang Li, Lina Zhang, Y. Wan
In recent years, the line projection approach is popular and simple for the color-to-gray conversion. This paper presents a new line projection global mapping method based on edge detection. Firstly, we calculate the ratio of the number of each candidate gray image boundary points to the number of the color image’s. All the gray images are determined by exhaustive search method. Secondly, we choose the maximum ratio as the optimal line projection direction. The method proposed in this paper focuses on the edge information of the image. Experimental results show that the proposed method is superior to the typical other methods in terms of the images with obvious regional features.
{"title":"A New Color-to-Gray Conversion Method Based on Edge Detection","authors":"Xiaofang Li, Lina Zhang, Y. Wan","doi":"10.1109/ICCCAS.2018.8769332","DOIUrl":"https://doi.org/10.1109/ICCCAS.2018.8769332","url":null,"abstract":"In recent years, the line projection approach is popular and simple for the color-to-gray conversion. This paper presents a new line projection global mapping method based on edge detection. Firstly, we calculate the ratio of the number of each candidate gray image boundary points to the number of the color image’s. All the gray images are determined by exhaustive search method. Secondly, we choose the maximum ratio as the optimal line projection direction. The method proposed in this paper focuses on the edge information of the image. Experimental results show that the proposed method is superior to the typical other methods in terms of the images with obvious regional features.","PeriodicalId":166878,"journal":{"name":"2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130591062","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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