Pub Date : 2015-11-01DOI: 10.1109/KBEI.2015.7436125
M. Bagheri
The electronic properties of zigzag graphene nanoribbons can be significantly modified from semiconducting to metallic states by change the atom's spin in graphene nano ribbons. In this paper, the impact of Stone-Wales defect on a Zigzag Graphene Nano-ribbon has been investigated for ferromagnetic and anti-ferromagnetic states. The Magnetic Resistance is calculated by applying Stone-Wales defect in the center of Graphene Nano-ribbons. The simulations are based on DFT method. The simulation results show that, by applying Stone-Wales defect, the bandgap increases in comparison to the ideal state, the conductivity decreases, and so does the current, and as a result of that, the Magnetic Resistance, at voltages below 0.5 V, decreases in comparison to the ideal state. At voltages above 0.5 V, the Magnetic Resistance increases in comparison to the ideal state. Also Magnetic Resistance can get negative values and reaches 650% at 1 V. The large tunable Magnetic Resistance of graphene nano ribbons is attractive to device applications.
{"title":"Influence of Stone Wales defect on magnetic resistance of zigzag graphene nanoribbons","authors":"M. Bagheri","doi":"10.1109/KBEI.2015.7436125","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436125","url":null,"abstract":"The electronic properties of zigzag graphene nanoribbons can be significantly modified from semiconducting to metallic states by change the atom's spin in graphene nano ribbons. In this paper, the impact of Stone-Wales defect on a Zigzag Graphene Nano-ribbon has been investigated for ferromagnetic and anti-ferromagnetic states. The Magnetic Resistance is calculated by applying Stone-Wales defect in the center of Graphene Nano-ribbons. The simulations are based on DFT method. The simulation results show that, by applying Stone-Wales defect, the bandgap increases in comparison to the ideal state, the conductivity decreases, and so does the current, and as a result of that, the Magnetic Resistance, at voltages below 0.5 V, decreases in comparison to the ideal state. At voltages above 0.5 V, the Magnetic Resistance increases in comparison to the ideal state. Also Magnetic Resistance can get negative values and reaches 650% at 1 V. The large tunable Magnetic Resistance of graphene nano ribbons is attractive to device applications.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126821006","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436184
Mojtaba Eslahi-Kelorazi, F. Parand
Smart grids are integrating advanced technologies into power grids. The new structure has a profound effect on the entire system. Now, power networks can deploy computing technologies to achieve new level of performance and efficiency. Game theory is a mathematical tool for modeling distributed multi-agent systems. There are game theoretic approaches for studying and solving smart grid issues. Important issues have been studied with game theory include demand side management, load shifting and dynamic energy price. Different authors have used different types of games and payoff functions. In this paper, we categorize most important issues and subjects in both game theory and smart grid. Also, we have a comprehensive review of articles which propose game theoretic approaches in the field of smart grid.
{"title":"Game theoretic approaches in modeling and solving smart grid issues","authors":"Mojtaba Eslahi-Kelorazi, F. Parand","doi":"10.1109/KBEI.2015.7436184","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436184","url":null,"abstract":"Smart grids are integrating advanced technologies into power grids. The new structure has a profound effect on the entire system. Now, power networks can deploy computing technologies to achieve new level of performance and efficiency. Game theory is a mathematical tool for modeling distributed multi-agent systems. There are game theoretic approaches for studying and solving smart grid issues. Important issues have been studied with game theory include demand side management, load shifting and dynamic energy price. Different authors have used different types of games and payoff functions. In this paper, we categorize most important issues and subjects in both game theory and smart grid. Also, we have a comprehensive review of articles which propose game theoretic approaches in the field of smart grid.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121220963","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436107
J. Mohammadi, K. Mirzaie, V. Derhami
One of the issues of combinatorial optimization is quadratic assignment problem (QAP). Solving this problem by using meta-heuristic algorithms to get good quality solution for average data takes a few minutes and for large data lasts for several hours. In this paper, to reduce the time to solve the problem of parallel genetic algorithm based on GPU (Graphics processing unit) is used. In addition, due to the problem of premature convergence of genetic algorithms, to improve results, some changes are applied on genetic algorithm. The results show that the proposed algorithm based on GPU gets more high-quality solutions in much less time than genetic algorithm based on CPU to solve the problem of QAP. In big problems, it acts 30X faster than base genetic algorithm.
{"title":"Parallel genetic algorithm based on GPU for solving quadratic assignment problem","authors":"J. Mohammadi, K. Mirzaie, V. Derhami","doi":"10.1109/KBEI.2015.7436107","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436107","url":null,"abstract":"One of the issues of combinatorial optimization is quadratic assignment problem (QAP). Solving this problem by using meta-heuristic algorithms to get good quality solution for average data takes a few minutes and for large data lasts for several hours. In this paper, to reduce the time to solve the problem of parallel genetic algorithm based on GPU (Graphics processing unit) is used. In addition, due to the problem of premature convergence of genetic algorithms, to improve results, some changes are applied on genetic algorithm. The results show that the proposed algorithm based on GPU gets more high-quality solutions in much less time than genetic algorithm based on CPU to solve the problem of QAP. In big problems, it acts 30X faster than base genetic algorithm.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"68 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114114263","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436144
M. Malekzadeh, A. Khosravi, Hossein Rasouli, A. R. Noei
Measurement and observation of chaotic system states are major challenge in the control engineering. Due to lack of availability of the states, the control purpose fails to realize required performance. In this paper a new observer based structure is proposed to control the chaos. The recently developed RISE feedback controller is combined with an adaptive-Neural observer to control the Genesio-Tesi chaotic system. Unlike to other conventional structures of neural network the applied observer is trained on-line. Performance of the proposed controller is investigated through simulation.
{"title":"A Genesio-Tesi chaotic control using an adaptive-neural observer based RISE controller","authors":"M. Malekzadeh, A. Khosravi, Hossein Rasouli, A. R. Noei","doi":"10.1109/KBEI.2015.7436144","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436144","url":null,"abstract":"Measurement and observation of chaotic system states are major challenge in the control engineering. Due to lack of availability of the states, the control purpose fails to realize required performance. In this paper a new observer based structure is proposed to control the chaos. The recently developed RISE feedback controller is combined with an adaptive-Neural observer to control the Genesio-Tesi chaotic system. Unlike to other conventional structures of neural network the applied observer is trained on-line. Performance of the proposed controller is investigated through simulation.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121702432","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436173
Hossein Salmabadi, M. Sarram, F. Adibnia
Wireless sensor network (WSN) refers to a group of spatially dispersed and dedicated sensors for monitoring and recording the physical conditions of the environment and organizing the collected data at a central location. WSNs measure environmental conditions like temperature, sound, pollution levels, humidity, wind speed and direction, pressure, etc. Sensors are usually attached to microcontroller and are powered by battery. Energy consideration is a critical issue for designing routing protocols. Routing techniques are the most important issue for networks where resources are limited. LEACH is one of the first hierarchical routing approaches for sensor networks. Most of the clustering algorithms are derived from this algorithm. In this paper we propose an improvement on the LEACH Protocol. In our proposed algorithm, Network logically divided into 4 zone. In first round for select CH the node that close to center of every zone forward its location to BS. Then BS select nodes that are closer than other node to center of regions. In addition, the residual energy of each node is also considered. We evaluate LEACH, PR-LEACH and Energy-Zone LEACH (EZ-LEACH) through simulations using NS2 simulator which shows that LR-LEACH performs better than LEACH and PR-LEACH protocols.
{"title":"An improvement on LEACH protocol (EZ-LEACH)","authors":"Hossein Salmabadi, M. Sarram, F. Adibnia","doi":"10.1109/KBEI.2015.7436173","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436173","url":null,"abstract":"Wireless sensor network (WSN) refers to a group of spatially dispersed and dedicated sensors for monitoring and recording the physical conditions of the environment and organizing the collected data at a central location. WSNs measure environmental conditions like temperature, sound, pollution levels, humidity, wind speed and direction, pressure, etc. Sensors are usually attached to microcontroller and are powered by battery. Energy consideration is a critical issue for designing routing protocols. Routing techniques are the most important issue for networks where resources are limited. LEACH is one of the first hierarchical routing approaches for sensor networks. Most of the clustering algorithms are derived from this algorithm. In this paper we propose an improvement on the LEACH Protocol. In our proposed algorithm, Network logically divided into 4 zone. In first round for select CH the node that close to center of every zone forward its location to BS. Then BS select nodes that are closer than other node to center of regions. In addition, the residual energy of each node is also considered. We evaluate LEACH, PR-LEACH and Energy-Zone LEACH (EZ-LEACH) through simulations using NS2 simulator which shows that LR-LEACH performs better than LEACH and PR-LEACH protocols.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"5 18","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113955817","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436018
M. Mahmoodi, Z. Fahimi
In this paper, an efficient predistortion method for linearization of RF power amplifiers is proposed. In this technique, appropriate signals are added to the main baseband input signal to reduce the nonlinearity of the PA. The non-linear relationship between input and output of an RF PA is analyzed and optimum values for the injection signals at the intermodulation frequencies are obtained. In addition, a high-speed low-cost MATLAB-FPGA interface is designed that can be used both in the training and testing phases of the system. Simulation results indicate that the proposed technique is capable of remarkably reducing spectral regrowth in adjacent channels for different non-constant envelope signals. Using a QPSK signal, the spectral regrowth and ACPR of the PA are decreased by 20dB and 26dB, respectively.
{"title":"An FPGA-based technique for linearizing RF power amplifiers","authors":"M. Mahmoodi, Z. Fahimi","doi":"10.1109/KBEI.2015.7436018","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436018","url":null,"abstract":"In this paper, an efficient predistortion method for linearization of RF power amplifiers is proposed. In this technique, appropriate signals are added to the main baseband input signal to reduce the nonlinearity of the PA. The non-linear relationship between input and output of an RF PA is analyzed and optimum values for the injection signals at the intermodulation frequencies are obtained. In addition, a high-speed low-cost MATLAB-FPGA interface is designed that can be used both in the training and testing phases of the system. Simulation results indicate that the proposed technique is capable of remarkably reducing spectral regrowth in adjacent channels for different non-constant envelope signals. Using a QPSK signal, the spectral regrowth and ACPR of the PA are decreased by 20dB and 26dB, respectively.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124150731","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436124
M. Mokhtari
In this paper, a continuous fault tolerant controller with uniform HOSM observer for identification and isolation of error in a model dynamic system is proposed. This fault-tolerant controller is based on integral sliding mode that is based on CA. According to the explanations provided, in the presence of uncertainties and actuator faults, stability of closed loop system by using this controller is checked and proved along with convergence of output to the reference signal. This control model was used on a passenger plane Boeing B747 in the simulation and the results indicate the effectiveness of the system.
{"title":"Fault tolerant control system design by using adaptive observer, case study: Civilian aircraft","authors":"M. Mokhtari","doi":"10.1109/KBEI.2015.7436124","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436124","url":null,"abstract":"In this paper, a continuous fault tolerant controller with uniform HOSM observer for identification and isolation of error in a model dynamic system is proposed. This fault-tolerant controller is based on integral sliding mode that is based on CA. According to the explanations provided, in the presence of uncertainties and actuator faults, stability of closed loop system by using this controller is checked and proved along with convergence of output to the reference signal. This control model was used on a passenger plane Boeing B747 in the simulation and the results indicate the effectiveness of the system.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126492136","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436017
H. Amin, Farshad Piri, E. O. Gunes
This paper presents a low power low voltage RF front-end for short range outdoor applications, meeting the IEEE 802.15.4 standard of 2.4 GHz for ZigBee systems. The design includes a two stage low power LNA with an integrated differential power splitter. Also, a low power, low voltage mixer is implemented to maintain the power specification of the design. The whole system has an almost 2.76 mW power dissipation and is supplied by 1.2 V voltage source. The design accomplished in TSMC 180 nm CMOS process. According to the simulation results acquired by Cadence Virtuoso, the design owns 22 dB conversion gain and 4.8 dB noise figure with IIP3 of -6.3 dBm.
{"title":"Design and simulation of a low power RF front-end for short range outdoor applications","authors":"H. Amin, Farshad Piri, E. O. Gunes","doi":"10.1109/KBEI.2015.7436017","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436017","url":null,"abstract":"This paper presents a low power low voltage RF front-end for short range outdoor applications, meeting the IEEE 802.15.4 standard of 2.4 GHz for ZigBee systems. The design includes a two stage low power LNA with an integrated differential power splitter. Also, a low power, low voltage mixer is implemented to maintain the power specification of the design. The whole system has an almost 2.76 mW power dissipation and is supplied by 1.2 V voltage source. The design accomplished in TSMC 180 nm CMOS process. According to the simulation results acquired by Cadence Virtuoso, the design owns 22 dB conversion gain and 4.8 dB noise figure with IIP3 of -6.3 dBm.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134086664","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436213
Zeynab Bakhshayeshian, M. Khalili
In this paper is provided a method to deliver courses by the head of department by algorithm clementine software which called cart. Cart is the classification rules. In this study, was applied cart algorithm on data of Qom Pun University, Dept. Computer and Informatics Engineering with 28018 records. The results show that the algorithm has discovered.
{"title":"An suggested method to university courses presentation based on cart algorithm to pun universities","authors":"Zeynab Bakhshayeshian, M. Khalili","doi":"10.1109/KBEI.2015.7436213","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436213","url":null,"abstract":"In this paper is provided a method to deliver courses by the head of department by algorithm clementine software which called cart. Cart is the classification rules. In this study, was applied cart algorithm on data of Qom Pun University, Dept. Computer and Informatics Engineering with 28018 records. The results show that the algorithm has discovered.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131650770","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 : 2015-11-01DOI: 10.1109/KBEI.2015.7436054
Navid Rajabi, Amin Hakim
With the passage of time, spacious shopping centers and malls are growing drastically and business owners are seeking to find a foremost way to sell their accommodations faster and easier and get away from traditional marketing & sales which compelled them to spend huge amount of money for advertisements with low range of efficiency. On the other hand, costumers are willing to buy their requirements more convenient by allocating less effort in energy and money expenditure and be aware of special offers to keep them in frugality. Consequently, we came up with an idea to invent "An Intelligent Interactive Marketing System based-on Internet of Things (IoT)" which helps these two groups to interact with each other and meet their needs in the best way. By using this system, costumers are able to get an application from the server of the shopping center (that is prepared by the Service Provider (SP)) while entering there to interact with this system. This application offers welcoming and questioning about costumer's favorites to recommend an effective orientation to the exact place to buy stuffs and in addition to aware costumer about its availability or not in that mall, get some services or get aware of special offers even though he/she doesn't have any tendency toward buying. In addition to the system mentioned above, by using the IoT, all stocks in stores can be dispatched to the server for the better performance and real time responding of our system. We will illustrate the details of our suggested system in this paper.
{"title":"An intelligent interactive marketing system based-on Internet of Things (IoT)","authors":"Navid Rajabi, Amin Hakim","doi":"10.1109/KBEI.2015.7436054","DOIUrl":"https://doi.org/10.1109/KBEI.2015.7436054","url":null,"abstract":"With the passage of time, spacious shopping centers and malls are growing drastically and business owners are seeking to find a foremost way to sell their accommodations faster and easier and get away from traditional marketing & sales which compelled them to spend huge amount of money for advertisements with low range of efficiency. On the other hand, costumers are willing to buy their requirements more convenient by allocating less effort in energy and money expenditure and be aware of special offers to keep them in frugality. Consequently, we came up with an idea to invent \"An Intelligent Interactive Marketing System based-on Internet of Things (IoT)\" which helps these two groups to interact with each other and meet their needs in the best way. By using this system, costumers are able to get an application from the server of the shopping center (that is prepared by the Service Provider (SP)) while entering there to interact with this system. This application offers welcoming and questioning about costumer's favorites to recommend an effective orientation to the exact place to buy stuffs and in addition to aware costumer about its availability or not in that mall, get some services or get aware of special offers even though he/she doesn't have any tendency toward buying. In addition to the system mentioned above, by using the IoT, all stocks in stores can be dispatched to the server for the better performance and real time responding of our system. We will illustrate the details of our suggested system in this paper.","PeriodicalId":168295,"journal":{"name":"2015 2nd International Conference on Knowledge-Based Engineering and Innovation (KBEI)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130890669","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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