Pub Date : 2017-09-01DOI: 10.1109/IWMN.2017.8078402
Giuseppe Aceto, Fabio Palumbo, V. Persico, A. Pescapé
Mobile Broadband (MBB) access networks are becoming more and more used worldwide, and the devices adopted to access them are increasing in number and complexity (smart-phones, mobile hotspots, vehicular infotainment systems). The highly dynamic nature of such scenarios calls for continuous monitoring and measurement of the network. To this aim, the Available Bandwidth is a performance metric of the utmost importance, albeit hard to estimate in uncontrolled scenarios. Shared experimental testbeds such as MONROE are becoming available to offer in-the-field MBB experimenting facilities. In this context, the SOMETIME project is focused on providing MONROE and similar testbeds with the tools to measure Available Bandwidth in MBB scenarios, also taking advantage of the benefit of SDN to perform active and passive measurements. In line with experimental activities planned by the project roadmap, in this paper we discuss the suitability of a number of publicly released ABw estimation tools when run in heterogeneous scenarios. Experimental results confirm that (i) the experimental scenario in which the tools run heavily impacts their performance in terms of accuracy; (ii) the entity of cross-traffic may have different effects on some of the tools, unacceptably undermining the estimation accuracy, depending on limitations of both the specific tools and the setup.
{"title":"An experimental evaluation of the impact of heterogeneous scenarios and virtualization on the available bandwidth estimation tools","authors":"Giuseppe Aceto, Fabio Palumbo, V. Persico, A. Pescapé","doi":"10.1109/IWMN.2017.8078402","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078402","url":null,"abstract":"Mobile Broadband (MBB) access networks are becoming more and more used worldwide, and the devices adopted to access them are increasing in number and complexity (smart-phones, mobile hotspots, vehicular infotainment systems). The highly dynamic nature of such scenarios calls for continuous monitoring and measurement of the network. To this aim, the Available Bandwidth is a performance metric of the utmost importance, albeit hard to estimate in uncontrolled scenarios. Shared experimental testbeds such as MONROE are becoming available to offer in-the-field MBB experimenting facilities. In this context, the SOMETIME project is focused on providing MONROE and similar testbeds with the tools to measure Available Bandwidth in MBB scenarios, also taking advantage of the benefit of SDN to perform active and passive measurements. In line with experimental activities planned by the project roadmap, in this paper we discuss the suitability of a number of publicly released ABw estimation tools when run in heterogeneous scenarios. Experimental results confirm that (i) the experimental scenario in which the tools run heavily impacts their performance in terms of accuracy; (ii) the entity of cross-traffic may have different effects on some of the tools, unacceptably undermining the estimation accuracy, depending on limitations of both the specific tools and the setup.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115386489","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 : 2017-09-01DOI: 10.1109/IWMN.2017.8078401
S. Avallone, N. Pasquino, S. Zinno, Domenico Casillo
4G Long Term Evolution (LTE) mobile system adopts Adaptive Modulation and Coding (AMC) as a link adaption mechanism that is based on the User Equipment (UE) periodically reporting channel condition summarised through Channel Quality Indicator (CQI) which, in turn, is based on Signal-to-Interference-plus-Noise Ratio (SINR) and Reference Signal Received Power (RSRP). Although CQI has a predominant role in accurately assignment of radio resources, standards do not define how to compute CQI from SINR and RSRP, so that each UE manufacturer operates according to proprietary policies. The paper focuses on the efficient evaluation of the relationship between SINR, RSRP and CQI and also to assess how AMC affects LTE performance. To operate in a realist environment, measurements are carried out with a smartphone-based procedure.
4G LTE (Long Term Evolution)移动系统采用自适应调制和编码(AMC)作为链路自适应机制，该机制基于用户设备(UE)定期报告通过信道质量指标(CQI)总结的信道状况，而CQI又基于信噪比(SINR)和参考信号接收功率(RSRP)。尽管CQI在准确分配无线电资源方面发挥着主导作用，但标准并没有定义如何从SINR和RSRP计算CQI，因此每个UE制造商都根据专有策略操作。本文的重点是有效评估SINR、RSRP和CQI之间的关系，并评估AMC如何影响LTE性能。为了在现实环境中操作，测量是通过基于智能手机的程序进行的。
{"title":"Experimental characterization of lte adaptive modulation and coding scheme under actual operating conditions","authors":"S. Avallone, N. Pasquino, S. Zinno, Domenico Casillo","doi":"10.1109/IWMN.2017.8078401","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078401","url":null,"abstract":"4G Long Term Evolution (LTE) mobile system adopts Adaptive Modulation and Coding (AMC) as a link adaption mechanism that is based on the User Equipment (UE) periodically reporting channel condition summarised through Channel Quality Indicator (CQI) which, in turn, is based on Signal-to-Interference-plus-Noise Ratio (SINR) and Reference Signal Received Power (RSRP). Although CQI has a predominant role in accurately assignment of radio resources, standards do not define how to compute CQI from SINR and RSRP, so that each UE manufacturer operates according to proprietary policies. The paper focuses on the efficient evaluation of the relationship between SINR, RSRP and CQI and also to assess how AMC affects LTE performance. To operate in a realist environment, measurements are carried out with a smartphone-based procedure.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125399091","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 : 2017-09-01DOI: 10.1109/IWMN.2017.8078400
L. Corchia, E. D. Benedetto, G. Monti, A. Cataldo, L. Tarricone
An effective remote monitoring of elderly people in telehealth applications requires their everyday activities not to be affected by the monitoring. In this regard, a possible strategy is to make sure that the components (i.e. sensor and antenna) necessary to carry out such monitoring are seamlessly integrated within the elderly's daily routine. Starting from these considerations, the present paper addresses the fabrication of wearable antennas that can be fully integrated with clothes and that can be used for remotely transmitting/receiving the sensor data. In particular, in this work, two different wearable antenna fabrication techniques (namely the use of non-woven conductive fabrics in combination with a cutting plotter and the embroidery of conductive threads) are investigated. The obtained numerical and experimental results demonstrate that the proposed fabrication techniques and strategies are very flexible, and can allow obtaining low-cost wearable antenna with tailored performance according to the specific application requirements.
{"title":"Wearable antennas for applications in remote assistance to elderly people","authors":"L. Corchia, E. D. Benedetto, G. Monti, A. Cataldo, L. Tarricone","doi":"10.1109/IWMN.2017.8078400","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078400","url":null,"abstract":"An effective remote monitoring of elderly people in telehealth applications requires their everyday activities not to be affected by the monitoring. In this regard, a possible strategy is to make sure that the components (i.e. sensor and antenna) necessary to carry out such monitoring are seamlessly integrated within the elderly's daily routine. Starting from these considerations, the present paper addresses the fabrication of wearable antennas that can be fully integrated with clothes and that can be used for remotely transmitting/receiving the sensor data. In particular, in this work, two different wearable antenna fabrication techniques (namely the use of non-woven conductive fabrics in combination with a cutting plotter and the embroidery of conductive threads) are investigated. The obtained numerical and experimental results demonstrate that the proposed fabrication techniques and strategies are very flexible, and can allow obtaining low-cost wearable antenna with tailored performance according to the specific application requirements.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124762272","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 : 2017-09-01DOI: 10.1109/IWMN.2017.8078399
G. Cheng, Yong Zhu, J. Grzesik, C. S. Lee
A new technique is presented for highly accurate far-field patterns obtained from spherical measurements in the near field of electrically large antennas. The proposed technique is based on the Field Mapping Algorithm, which provides exact fields on any desired surface from near-field data measured over a planar, cylindrical, or spherical surface. This method makes it possible to calculate complete far-field patterns, including especially the backlobes for large reflector antennas.
{"title":"Spherical near-fîeld measurements for electrically large antennas","authors":"G. Cheng, Yong Zhu, J. Grzesik, C. S. Lee","doi":"10.1109/IWMN.2017.8078399","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078399","url":null,"abstract":"A new technique is presented for highly accurate far-field patterns obtained from spherical measurements in the near field of electrically large antennas. The proposed technique is based on the Field Mapping Algorithm, which provides exact fields on any desired surface from near-field data measured over a planar, cylindrical, or spherical surface. This method makes it possible to calculate complete far-field patterns, including especially the backlobes for large reflector antennas.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124766013","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 : 2017-09-01DOI: 10.1109/IWMN.2017.8078404
G. Dimopoulos, P. Barlet-Ros, C. Dovrolis, Ilias Leontiadis
Network performance anomalies can be defined as abnormal and significant variations in a network's traffic levels. Being able to detect anomalies is critical for both network operators and end users. However, the accurate detection without raising false alarms can become a challenging task when there is high variance in the traffic. To address this problem, we present in this paper a novel methodology for detecting performance anomalies based on contextual information. The proposed method is compared with the state of the art and is evaluated with high accuracy on both synthetic and real network traffic.
{"title":"Detecting network performance anomalies with contextual anomaly detection","authors":"G. Dimopoulos, P. Barlet-Ros, C. Dovrolis, Ilias Leontiadis","doi":"10.1109/IWMN.2017.8078404","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078404","url":null,"abstract":"Network performance anomalies can be defined as abnormal and significant variations in a network's traffic levels. Being able to detect anomalies is critical for both network operators and end users. However, the accurate detection without raising false alarms can become a challenging task when there is high variance in the traffic. To address this problem, we present in this paper a novel methodology for detecting performance anomalies based on contextual information. The proposed method is compared with the state of the art and is evaluated with high accuracy on both synthetic and real network traffic.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129095387","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 : 2017-09-01DOI: 10.1109/IWMN.2017.8078378
Edoardo De Din, Gianluca Lipari, Andrea Angioni, F. Ponci, A. Monti
The distributed control of islanded AC microgrids is based on the local measurements of the electrical variables at some nodes of the system to perform the secondary control. The Phasor Measurement Units (PMUs) guarantee accurate synchronized measurements that can be used as input signals for such distributed controllers. This paper analyzes the effect of one of the characteristic parameters of the PMU, the reporting rate, on the control performance. Verifying that could allow the use of low cost measurement devices with the aim of implementing the monitoring and control of low voltage microgrids.
{"title":"Effect of the reporting rate of synchrophasor measurements for distributed secondary control of AC microgrid","authors":"Edoardo De Din, Gianluca Lipari, Andrea Angioni, F. Ponci, A. Monti","doi":"10.1109/IWMN.2017.8078378","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078378","url":null,"abstract":"The distributed control of islanded AC microgrids is based on the local measurements of the electrical variables at some nodes of the system to perform the secondary control. The Phasor Measurement Units (PMUs) guarantee accurate synchronized measurements that can be used as input signals for such distributed controllers. This paper analyzes the effect of one of the characteristic parameters of the PMU, the reporting rate, on the control performance. Verifying that could allow the use of low cost measurement devices with the aim of implementing the monitoring and control of low voltage microgrids.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130933714","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 : 2017-09-01DOI: 10.1109/IWMN.2017.8078363
F. Abate, A. Pietrosanto, V. Paciello, G. Monte
The paper deals with an impedance measurement technique that could be real time executed by smart transducers. The technique is based on a standardized data structure (in the following named MCT), that is a new way to represent sampled signals within transducer interface modules, as defined in the standard IEEE 21451-001-2017. At first, the MCT data structure is briefly presented. Then the impedance measurement algorithm is described. Finally, the results of some simulation tests are reported and discussed.
{"title":"Impedance measurement in IEEE 21451 transducer interface modules","authors":"F. Abate, A. Pietrosanto, V. Paciello, G. Monte","doi":"10.1109/IWMN.2017.8078363","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078363","url":null,"abstract":"The paper deals with an impedance measurement technique that could be real time executed by smart transducers. The technique is based on a standardized data structure (in the following named MCT), that is a new way to represent sampled signals within transducer interface modules, as defined in the standard IEEE 21451-001-2017. At first, the MCT data structure is briefly presented. Then the impedance measurement algorithm is described. Finally, the results of some simulation tests are reported and discussed.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116353300","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 : 2017-09-01DOI: 10.1109/IWMN.2017.8078405
Marjo Heikkilä, Juha Erkkila, Marjut Koskela, J. Heikkilä, Tuomo Kupiainen, J. Tervonen, M. Migliore
The aim of this paper is to introduce the measurement method for challenging Non-Line of Sight (NLOS) conditions in mobile networks. The need to develop the measurement method appeared LTE (Long Term Evolution) uplink (UL) performance with different antenna technologies when receiving NLOS signal in field tests. Many challenges appeared during the study. This paper introduces the challenges and presents solution.
本文的目的是介绍移动网络中具有挑战性的非视线(NLOS)条件的测量方法。在现场测试中，不同天线技术接收NLOS信号时，出现了LTE (Long Term Evolution)上行链路(UL)性能测量方法的需求。研究过程中出现了许多挑战。本文介绍了面临的挑战并提出了解决方案。
{"title":"Development of the measurement method for challenging NLOS conditions in mobile networks","authors":"Marjo Heikkilä, Juha Erkkila, Marjut Koskela, J. Heikkilä, Tuomo Kupiainen, J. Tervonen, M. Migliore","doi":"10.1109/IWMN.2017.8078405","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078405","url":null,"abstract":"The aim of this paper is to introduce the measurement method for challenging Non-Line of Sight (NLOS) conditions in mobile networks. The need to develop the measurement method appeared LTE (Long Term Evolution) uplink (UL) performance with different antenna technologies when receiving NLOS signal in field tests. Many challenges appeared during the study. This paper introduces the challenges and presents solution.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125884191","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 : 2017-09-01DOI: 10.1109/IWMN.2017.8078371
P. Ferrari, A. Flammini, M. Rizzi, E. Sisinni, M. Gidlund
Internet of Things (loT) aims at collecting data from billions of devices connected altogether. Despite there is no one technology able to cope with all possible scenarios, LPWAN solutions are emerging as viable technologies for implementing private, low-cost cellular like wireless networks. Distributed systems could leverage this approach as a driving technology for services as smart environment sensing, pervasive sensing and so on. In the considered scenario, the capacity of the network is of main importance; even if communication is sporadic for most of the time, an event observed by many nodes results in a huge amount of simultaneous transmissions. Are the IoT technologies usable to this end? In this paper LoRaWAN technology is investigated, with the aim of evaluating the orthogonality of virtual channels permitted by the LoRa physical layer. In particular, measurements demonstrated that overlapping transmissions having the same power at the receiver can be correctly decoded if occurring with different spreading factors, whereas co-spread messages require at least 4ms spacing.
{"title":"On the evaluation of LoRaWAN virtual channels orthogonality for dense distributed systems","authors":"P. Ferrari, A. Flammini, M. Rizzi, E. Sisinni, M. Gidlund","doi":"10.1109/IWMN.2017.8078371","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078371","url":null,"abstract":"Internet of Things (loT) aims at collecting data from billions of devices connected altogether. Despite there is no one technology able to cope with all possible scenarios, LPWAN solutions are emerging as viable technologies for implementing private, low-cost cellular like wireless networks. Distributed systems could leverage this approach as a driving technology for services as smart environment sensing, pervasive sensing and so on. In the considered scenario, the capacity of the network is of main importance; even if communication is sporadic for most of the time, an event observed by many nodes results in a huge amount of simultaneous transmissions. Are the IoT technologies usable to this end? In this paper LoRaWAN technology is investigated, with the aim of evaluating the orthogonality of virtual channels permitted by the LoRa physical layer. In particular, measurements demonstrated that overlapping transmissions having the same power at the receiver can be correctly decoded if occurring with different spreading factors, whereas co-spread messages require at least 4ms spacing.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"34 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131770010","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 : 2017-09-01DOI: 10.1109/IWMN.2017.8078393
S. Narieda, Hiromichi Ogasawara
This paper presents the design technique of the selection diversity combining based spectrum sensing in cognitive radio networks. In general, the selection diversity combining scheme requires period to choose an optimal element, and spectrum sensing also requires period to detect a target signal. Because spending a long time for the selection and sensing increases the accuracy of the selection and signal detection, respectively, these periods must be considered when developing selection diversity combining based spectrum sensing. Therefore, the required period for spectrum sensing based on selection diversity combining is the summation of the selection and sensing periods, and the selection diversity combining based sensing must consider the period. We have presented the selection diversity combining based spectrum sensing considering on these period, and however, the effect of the length of these periods on the sensing performance has never discussed. In this paper, we discuss the design technique of these period for the improvement of the sensing performance. Numerical examples are shown to validate the effectiveness of the presented design techniques.
{"title":"Design of energy detection based on selection diversity combining in cognitive radio","authors":"S. Narieda, Hiromichi Ogasawara","doi":"10.1109/IWMN.2017.8078393","DOIUrl":"https://doi.org/10.1109/IWMN.2017.8078393","url":null,"abstract":"This paper presents the design technique of the selection diversity combining based spectrum sensing in cognitive radio networks. In general, the selection diversity combining scheme requires period to choose an optimal element, and spectrum sensing also requires period to detect a target signal. Because spending a long time for the selection and sensing increases the accuracy of the selection and signal detection, respectively, these periods must be considered when developing selection diversity combining based spectrum sensing. Therefore, the required period for spectrum sensing based on selection diversity combining is the summation of the selection and sensing periods, and the selection diversity combining based sensing must consider the period. We have presented the selection diversity combining based spectrum sensing considering on these period, and however, the effect of the length of these periods on the sensing performance has never discussed. In this paper, we discuss the design technique of these period for the improvement of the sensing performance. Numerical examples are shown to validate the effectiveness of the presented design techniques.","PeriodicalId":201479,"journal":{"name":"2017 IEEE International Workshop on Measurement and Networking (M&N)","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132368893","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：