Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933418
S. S. Krishna Chaitanya Bulusu, H. Shaiek, D. Roviras, R. Zayani
The Filter Bank Multi-Carrier (FBMC) based systems are being seriously considered for 5G Radio Access Technology (RAT). As FBMC-OQAM is a multi-carrier technique, it suffers from the high Peak-to-Average Power Ratio (PAPR) and directly applying the PAPR reduction schemes proposed for OFDM to FBMC-OQAM turns out to be ineffective, due to its overlapping structure. In this paper, a scheme named as Dispersive Selective Mapping (DSLM) is proposed, which is an extended and generalized version of Overlapped Selective Mapping (OSLM). Simulation results show that performance of this method is very closely trailing to that of OFDM.
{"title":"Reduction of PAPR for FBMC-OQAM systems using dispersive SLM technique","authors":"S. S. Krishna Chaitanya Bulusu, H. Shaiek, D. Roviras, R. Zayani","doi":"10.1109/ISWCS.2014.6933418","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933418","url":null,"abstract":"The Filter Bank Multi-Carrier (FBMC) based systems are being seriously considered for 5G Radio Access Technology (RAT). As FBMC-OQAM is a multi-carrier technique, it suffers from the high Peak-to-Average Power Ratio (PAPR) and directly applying the PAPR reduction schemes proposed for OFDM to FBMC-OQAM turns out to be ineffective, due to its overlapping structure. In this paper, a scheme named as Dispersive Selective Mapping (DSLM) is proposed, which is an extended and generalized version of Overlapped Selective Mapping (OSLM). Simulation results show that performance of this method is very closely trailing to that of OFDM.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129590095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933399
M. Mackowiak, L. Correia, Adrian Kliks, P. Kryszkiewicz
In this paper the Multiple-Input-Single-Output (MISO) antenna system is considered, where a set of wearable antennas is deployed on various locations on the body, in order to enhance the connection reliability with the distant cellular-network receiver. Two body dynamics in a street scenario, i.e., run straight and run in loop are analysed. First of all, using the Geometrically Based Stochastical Channel Model adapted to Body Area Networks, the channel parameters were analysed. On average, the difference between the maximum and minimum values of path loss from different wearable antennas and external receiver is equal to 23 dB. Moreover, the capacity of the system is studied, and the application of bit-and-power loading schemes in MISO-OFDM systems is presented. Depending on the body position in the street, the average data rate varies in [2, 5.5] bps/Hz.
{"title":"MIMO channel analysis in the context of body area networks","authors":"M. Mackowiak, L. Correia, Adrian Kliks, P. Kryszkiewicz","doi":"10.1109/ISWCS.2014.6933399","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933399","url":null,"abstract":"In this paper the Multiple-Input-Single-Output (MISO) antenna system is considered, where a set of wearable antennas is deployed on various locations on the body, in order to enhance the connection reliability with the distant cellular-network receiver. Two body dynamics in a street scenario, i.e., run straight and run in loop are analysed. First of all, using the Geometrically Based Stochastical Channel Model adapted to Body Area Networks, the channel parameters were analysed. On average, the difference between the maximum and minimum values of path loss from different wearable antennas and external receiver is equal to 23 dB. Moreover, the capacity of the system is studied, and the application of bit-and-power loading schemes in MISO-OFDM systems is presented. Depending on the body position in the street, the average data rate varies in [2, 5.5] bps/Hz.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127065475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933384
Giancarlo Pastor, Inmaculada Mora-Jiménez, A. Caamaño, Riku Jantti
The Edgeworth expansion approximates nearly Gaussian distributions in terms of cumulants. This expansion is developed within the framework of First Kind Statistics, where definitions are derived from the Fourier transform. Alternatively, the framework of Second Kind Statistics offers analogous definitions which are derived from the Mellin transform. Although a formalism with such similarity to the existing definitions cannot lead to intrinsically new results, statistical methods within this new framework has been understudied. This paper introduces an Edgeworth expansion in terms of log-cumulants, which are the analogous to cumulants for the Second Kind statistics. More importantly, this new expansion approximates asymmetric distributions which are commonly-found in aggregate interference modeling.
{"title":"Log-cumulants-based Edgeworth expansion for skew-distributed aggregate interference","authors":"Giancarlo Pastor, Inmaculada Mora-Jiménez, A. Caamaño, Riku Jantti","doi":"10.1109/ISWCS.2014.6933384","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933384","url":null,"abstract":"The Edgeworth expansion approximates nearly Gaussian distributions in terms of cumulants. This expansion is developed within the framework of First Kind Statistics, where definitions are derived from the Fourier transform. Alternatively, the framework of Second Kind Statistics offers analogous definitions which are derived from the Mellin transform. Although a formalism with such similarity to the existing definitions cannot lead to intrinsically new results, statistical methods within this new framework has been understudied. This paper introduces an Edgeworth expansion in terms of log-cumulants, which are the analogous to cumulants for the Second Kind statistics. More importantly, this new expansion approximates asymmetric distributions which are commonly-found in aggregate interference modeling.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130089829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933421
R. Fritzsche, G. Fettweis
In mobile slow fading scenarios, channel state information (CSI) is required at the transmitter to adapt the data transmission strategy to the current channel state. In this regard, precoding in multiuser-multiple-input-multiple-output (MU-MIMO) downlink systems is a prominent example. In frequency division duplex, channel observations are quantized and fed back via the uplink, protected by an error correction code. The quantization resolution together with the code strength correspond to a certain amount of feedback bits. For a limited number of uplink signaling resources, there is a trade-off between investing bits for increasing the quantization resolution or for improving the error correction capability. While existing feedback schemes use a fixed quantization resolution, this work proposes a scheme which finds the optimal number of quantization bits for minimizing the channel uncertainty at the transmitter. Simulation results verify the proposed solution and apply it to precoded transmission in a MU-MIMO downlink system.
{"title":"Optimized quantization resolution for limited CSI feedback with outage","authors":"R. Fritzsche, G. Fettweis","doi":"10.1109/ISWCS.2014.6933421","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933421","url":null,"abstract":"In mobile slow fading scenarios, channel state information (CSI) is required at the transmitter to adapt the data transmission strategy to the current channel state. In this regard, precoding in multiuser-multiple-input-multiple-output (MU-MIMO) downlink systems is a prominent example. In frequency division duplex, channel observations are quantized and fed back via the uplink, protected by an error correction code. The quantization resolution together with the code strength correspond to a certain amount of feedback bits. For a limited number of uplink signaling resources, there is a trade-off between investing bits for increasing the quantization resolution or for improving the error correction capability. While existing feedback schemes use a fixed quantization resolution, this work proposes a scheme which finds the optimal number of quantization bits for minimizing the channel uncertainty at the transmitter. Simulation results verify the proposed solution and apply it to precoded transmission in a MU-MIMO downlink system.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129033887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933461
Ivan Ganchev, Zhanlin Ji, M. O'Droma
This paper describes the design and implementation of a cloud-based service recommendation system used to discover and suggest to users the `best' mobile services in the emerging ubiquitous consumer wireless world (UCWW). With this distributed system, the UCWW cloud provider collects user behavior (e.g., Internet logs, web browsing, searching for services, participation in social networks, online shopping, friends' recommendations for services, etc.), analyzes this `big data' in the cloud, and recommends the `best' mobile services applicable to that particular user under the always best connected and best served (ABC&S) paradigm. A number of novel software solutions, both on the user- and cloud side, are proposed. An approach towards running this service recommendation system in a flexible and intelligent way is elaborated.
{"title":"A cloud-based service recommendation system for use in UCWW","authors":"Ivan Ganchev, Zhanlin Ji, M. O'Droma","doi":"10.1109/ISWCS.2014.6933461","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933461","url":null,"abstract":"This paper describes the design and implementation of a cloud-based service recommendation system used to discover and suggest to users the `best' mobile services in the emerging ubiquitous consumer wireless world (UCWW). With this distributed system, the UCWW cloud provider collects user behavior (e.g., Internet logs, web browsing, searching for services, participation in social networks, online shopping, friends' recommendations for services, etc.), analyzes this `big data' in the cloud, and recommends the `best' mobile services applicable to that particular user under the always best connected and best served (ABC&S) paradigm. A number of novel software solutions, both on the user- and cloud side, are proposed. An approach towards running this service recommendation system in a flexible and intelligent way is elaborated.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130907459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933415
Oussama Lazrak, C. Moy
This paper focuses on the design and implementation processes of Cognitive radio equipments. The implementation is based on Oriented Object approach, C++ language and USRP platforms for the radio interface. The design is based on HDCRAM Architecture for better modularity and reusability. We develop a framework which provides the necessary mechanisms for developers to carry out different cognitive scenarios. We presented a scenario already implemented and tested. The use of this approach significantly reduces errors and time of development.
{"title":"Model-based development for cognitive radio applications","authors":"Oussama Lazrak, C. Moy","doi":"10.1109/ISWCS.2014.6933415","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933415","url":null,"abstract":"This paper focuses on the design and implementation processes of Cognitive radio equipments. The implementation is based on Oriented Object approach, C++ language and USRP platforms for the radio interface. The design is based on HDCRAM Architecture for better modularity and reusability. We develop a framework which provides the necessary mechanisms for developers to carry out different cognitive scenarios. We presented a scenario already implemented and tested. The use of this approach significantly reduces errors and time of development.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131014109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933318
G. Capdehourat, Federico Larroca, P. Belzarena
In recent years we have seen the success of wireless communications in unlicensed frequency bands, mainly driven by the 802.11 standard. The clear trend in the growth of traffic demand suggests that spectrum scarcity will be a serious threat to reach the capacity needs in the near future. Looking for more available spectrum, regulators have already begun to study secondary assignments in licensed bands, based on the recent cognitive network paradigm. In this context, we focus our work in the analysis of optimum spectrum allocation mechanisms. We introduce a stochastic model to formulate the problem, considering primary users' activity and a periodically scheduled assignment scheme. To solve the problem we propose a novel robust solution, which we argue is superior to an expectation based approach, comparing both alternatives through extensive simulations.
{"title":"Robust spectrum allocation for cognitive radio networks","authors":"G. Capdehourat, Federico Larroca, P. Belzarena","doi":"10.1109/ISWCS.2014.6933318","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933318","url":null,"abstract":"In recent years we have seen the success of wireless communications in unlicensed frequency bands, mainly driven by the 802.11 standard. The clear trend in the growth of traffic demand suggests that spectrum scarcity will be a serious threat to reach the capacity needs in the near future. Looking for more available spectrum, regulators have already begun to study secondary assignments in licensed bands, based on the recent cognitive network paradigm. In this context, we focus our work in the analysis of optimum spectrum allocation mechanisms. We introduce a stochastic model to formulate the problem, considering primary users' activity and a periodically scheduled assignment scheme. To solve the problem we propose a novel robust solution, which we argue is superior to an expectation based approach, comparing both alternatives through extensive simulations.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"54 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123220913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933482
F. Awad, E. Taqieddin, M. Mowafi, O. Banimelhem, Amani AbuQdais
As the demand for large-scale wireless multimedia sensor networks increases, so does the need for well-designed protocols that optimize the utilization of available networks resources. This requires experimental testing for realistic performance evaluation and design tuning. However, experimental testing of large-scale wireless networks using hardware testbeds is usually very hard to perform due to the need for collecting and monitoring the performance metrics data for multiple sensor nodes all at the same time, especially the node's energy consumption data. On the other hand, pure simulation testing may not accurately replicate the real-life scenarios, especially those parameters that are related to the wireless signal behavior in special environments. Therefore, this work attempts to close this gap between experimental and simulation testing. This paper presents a scalable simulation testbed that attempts to mimic our previously designed small-scale hardware testbed for wireless multimedia sensor networks by tuning the simulation parameters to match the real-life measurements obtained via experimental testing. The proposed simulation testbed embeds the JPEG and JPEG2000 image compression algorithms and potentially allows for network-controlled image compression and transmission decisions. The simulation results show very close match to the small-scale experimental testing as well as to the hypothetical large-scale extensions that were based on the experimental results.
{"title":"A simulation testbed to jointly exploit multiple image compression techniques for wireless multimedia sensor networks","authors":"F. Awad, E. Taqieddin, M. Mowafi, O. Banimelhem, Amani AbuQdais","doi":"10.1109/ISWCS.2014.6933482","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933482","url":null,"abstract":"As the demand for large-scale wireless multimedia sensor networks increases, so does the need for well-designed protocols that optimize the utilization of available networks resources. This requires experimental testing for realistic performance evaluation and design tuning. However, experimental testing of large-scale wireless networks using hardware testbeds is usually very hard to perform due to the need for collecting and monitoring the performance metrics data for multiple sensor nodes all at the same time, especially the node's energy consumption data. On the other hand, pure simulation testing may not accurately replicate the real-life scenarios, especially those parameters that are related to the wireless signal behavior in special environments. Therefore, this work attempts to close this gap between experimental and simulation testing. This paper presents a scalable simulation testbed that attempts to mimic our previously designed small-scale hardware testbed for wireless multimedia sensor networks by tuning the simulation parameters to match the real-life measurements obtained via experimental testing. The proposed simulation testbed embeds the JPEG and JPEG2000 image compression algorithms and potentially allows for network-controlled image compression and transmission decisions. The simulation results show very close match to the small-scale experimental testing as well as to the hypothetical large-scale extensions that were based on the experimental results.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126007131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933423
D. Alves, Renato B. Machado, D. B. D. Costa, A. P. Legg, B. Filho
We propose a dynamic hybrid antenna/relay selection scheme for multiple-access relay systems. The proposed scheme aims to boost the system throughput while keeping a good error performance. By using the channel state information, the destination node performs a dynamic selection between the signals provided by the multi-antenna relay, located in the inter-cell region, and the relay nodes geographically distributed over the cells. The multi-antenna relay and the single-antenna relay nodes employ the decode-remodulate-and-forward and amplify-and-forward protocols, respectively. Results reveal that the proposed scheme offers a good tradeoff between spectral efficiency and diversity gain, which is one of the main requirements for the next generation of wireless communications systems.
{"title":"A dynamic hybrid antenna/relay selection scheme for the multiple-access relay channel","authors":"D. Alves, Renato B. Machado, D. B. D. Costa, A. P. Legg, B. Filho","doi":"10.1109/ISWCS.2014.6933423","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933423","url":null,"abstract":"We propose a dynamic hybrid antenna/relay selection scheme for multiple-access relay systems. The proposed scheme aims to boost the system throughput while keeping a good error performance. By using the channel state information, the destination node performs a dynamic selection between the signals provided by the multi-antenna relay, located in the inter-cell region, and the relay nodes geographically distributed over the cells. The multi-antenna relay and the single-antenna relay nodes employ the decode-remodulate-and-forward and amplify-and-forward protocols, respectively. Results reveal that the proposed scheme offers a good tradeoff between spectral efficiency and diversity gain, which is one of the main requirements for the next generation of wireless communications systems.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123801015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933469
M. Popović, M. Tesanovic, Benoit Radier
This paper outlines available means and possible new strategies for reducing Electromagnetic field (EMF) exposure of the population in current and emerging cellular networks. The rise of public concerns stimulated by the ubiquity of wireless devices is generally misdirected at antennas of macro base stations, whereas the largest part of human exposure generally originates from user devices. This paper explores various EMF exposure scenarios, identifies resources for EMF assessment and techniques for its reduction, and paves the way for future validation of proposed techniques. Available cellular technologies, current traffic conditions and user context, including services used, are main points to be taken into account, as will be shown using preliminary measurement results, which justify our initial assumptions and illustrate the complexity of the subject matter. An assessment of the impact on communications standards of our proposed approach is also provided.
{"title":"Strategies for reducing the global EMF exposure: Cellular operators perspective","authors":"M. Popović, M. Tesanovic, Benoit Radier","doi":"10.1109/ISWCS.2014.6933469","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933469","url":null,"abstract":"This paper outlines available means and possible new strategies for reducing Electromagnetic field (EMF) exposure of the population in current and emerging cellular networks. The rise of public concerns stimulated by the ubiquity of wireless devices is generally misdirected at antennas of macro base stations, whereas the largest part of human exposure generally originates from user devices. This paper explores various EMF exposure scenarios, identifies resources for EMF assessment and techniques for its reduction, and paves the way for future validation of proposed techniques. Available cellular technologies, current traffic conditions and user context, including services used, are main points to be taken into account, as will be shown using preliminary measurement results, which justify our initial assumptions and illustrate the complexity of the subject matter. An assessment of the impact on communications standards of our proposed approach is also provided.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134293664","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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