Pub Date : 2019-10-01DOI: 10.1109/MMS48040.2019.9157257
F. Haddad, W. Rahajandraibe, I. Ghorbel
This paper presents a design of a CMOS digitally controlled oscillator (DCO) using a tunable active inductor (TAI) to reduce the area and cost for reconfigurable multi-band RF applications. The compatibility of this circuit to different wireless standards shows its potential to be implemented for the Internet of Things (IoT). The proposed TAI, based on a gyrator-C topology, achieves coarse frequency tuning due to a 4-bit digitally controlled current source. Implemented in 130 nm CMOS technology, the DCO occupies an area of only $(52 times 48) mumathrm{m}^{2}$. The circuit offers a frequency tuning from 1.65 GHz to 2.5 GHz for a 4-bit digital control word in [1], [15]. The optimal phase noise is about −87 dBc/Hz@1 MHz offset with power consumption varying from 2.6 mW to 5 mW at a supply voltage of 1.1 V when changing the control word digitally from 1 to 15.
本文提出了一种采用可调谐有源电感(TAI)的CMOS数字控制振荡器(DCO)的设计，以减少可重构多频段射频应用的面积和成本。该电路对不同无线标准的兼容性显示了其在物联网(IoT)中实现的潜力。所提出的TAI基于陀螺- c拓扑结构，通过4位数字控制电流源实现粗频率调谐。采用130 nm CMOS技术实现，DCO占地面积仅为$(52 times 48) mu mathm {m}^{2}$。该电路为[1]，[15]中的4位数字控制字提供从1.65 GHz到2.5 GHz的频率调谐。在电源电压为1.1 V时，将数字控制字从1更改为15，其最佳相位噪声约为−87 dBc/Hz@1 MHz偏移，功耗为2.6 mW至5mw。
{"title":"A CMOS Digitally Controlled Oscillator for Reconfigurable RF Applications","authors":"F. Haddad, W. Rahajandraibe, I. Ghorbel","doi":"10.1109/MMS48040.2019.9157257","DOIUrl":"https://doi.org/10.1109/MMS48040.2019.9157257","url":null,"abstract":"This paper presents a design of a CMOS digitally controlled oscillator (DCO) using a tunable active inductor (TAI) to reduce the area and cost for reconfigurable multi-band RF applications. The compatibility of this circuit to different wireless standards shows its potential to be implemented for the Internet of Things (IoT). The proposed TAI, based on a gyrator-C topology, achieves coarse frequency tuning due to a 4-bit digitally controlled current source. Implemented in 130 nm CMOS technology, the DCO occupies an area of only $(52 times 48) mumathrm{m}^{2}$. The circuit offers a frequency tuning from 1.65 GHz to 2.5 GHz for a 4-bit digital control word in [1], [15]. The optimal phase noise is about −87 dBc/Hz@1 MHz offset with power consumption varying from 2.6 mW to 5 mW at a supply voltage of 1.1 V when changing the control word digitally from 1 to 15.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129676844","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 : 2019-10-01DOI: 10.1109/MMS48040.2019.9157324
M. Mnif, H. Mnif, M. Loulou
Ambient Radio Frequency (RF) energy harvesting has been an attractive area of research due to its eventual applications in many modern low-power systems. The RF waves are present on several high frequency and at low power (a few μW). We present in this paper a new architecture RF-DC rectifier circuit operates at dual simultaneous frequencies. The bands frequencies chosen for this work are GSM (900MHz) and WIFI (2.45GHz). The proposed rectifier is designed in three stages using the MOSFET transistors, the capacitors and the inductors. The technology used is CMOS 0,18μm from TSMC and the simulations were performed using the ADS (Advanced Design System) Simulator. This circuit provides a Power Conversion Efficiency (PCE) of 68.4 % with an input power Pin= −21.3 dbm and an output voltage Vout=1.67 V for the frequency 900 MHz and a PCE of 72.4 % with an input power Pin= −20.5 dbm and an output voltage Vout=1.7 V for the frequency 2.45GHz.
{"title":"An Efficient Dual Band 900MHz / 2.45GHz RF Energy Harvester","authors":"M. Mnif, H. Mnif, M. Loulou","doi":"10.1109/MMS48040.2019.9157324","DOIUrl":"https://doi.org/10.1109/MMS48040.2019.9157324","url":null,"abstract":"Ambient Radio Frequency (RF) energy harvesting has been an attractive area of research due to its eventual applications in many modern low-power systems. The RF waves are present on several high frequency and at low power (a few μW). We present in this paper a new architecture RF-DC rectifier circuit operates at dual simultaneous frequencies. The bands frequencies chosen for this work are GSM (900MHz) and WIFI (2.45GHz). The proposed rectifier is designed in three stages using the MOSFET transistors, the capacitors and the inductors. The technology used is CMOS 0,18μm from TSMC and the simulations were performed using the ADS (Advanced Design System) Simulator. This circuit provides a Power Conversion Efficiency (PCE) of 68.4 % with an input power Pin= −21.3 dbm and an output voltage Vout=1.67 V for the frequency 900 MHz and a PCE of 72.4 % with an input power Pin= −20.5 dbm and an output voltage Vout=1.7 V for the frequency 2.45GHz.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123068577","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 : 2019-10-01DOI: 10.1109/mms48040.2019.9157279
A. Abdallah, Amin Zribi, A. Dziri, F. Tlili, M. Terré
A highly reliable and efficient wireless communication system for compressed images delivery is required in emerging multimedia applications. However, the transmission of the image can be attenuated by different factors mainly involved by the wireless communication multimedia systems. In the past decades, various source and channel coding schemes have been developed separately. In this paper, we investigate a joint source-channel coding scheme to improve the image transmission performance. Our main target is to reach a good tradeoff in terms of rate-distortion for Set Partitioning in Hierarchical Trees (SPIHT) image transmission. For the wireless communication part, we consider the Audio Visual PHY Ultra Wide Band IEEE 802.15.3c system. The proposed strategies rely on adaptive process applied for error protection and the modulation operations. Thus, error correcting codes for unequal error protection (UEP) of the compressed bit streams is included. Then, Hierarchical Modulation (HM) is applied to the different bits according to their importance levels. Full of simulations are performed and our results show image quality improvements at the receiver using multilevel UEP and Hierarchical Modulation compared to the ordinary joint source-channel coding system without introducing any extra bandwidth usage.
{"title":"Adaptive Joint Source-Channel Coding Using Multilevel codes for Unequal Error Protection and Hierarchical Modulation for SPIHT Image Transmission","authors":"A. Abdallah, Amin Zribi, A. Dziri, F. Tlili, M. Terré","doi":"10.1109/mms48040.2019.9157279","DOIUrl":"https://doi.org/10.1109/mms48040.2019.9157279","url":null,"abstract":"A highly reliable and efficient wireless communication system for compressed images delivery is required in emerging multimedia applications. However, the transmission of the image can be attenuated by different factors mainly involved by the wireless communication multimedia systems. In the past decades, various source and channel coding schemes have been developed separately. In this paper, we investigate a joint source-channel coding scheme to improve the image transmission performance. Our main target is to reach a good tradeoff in terms of rate-distortion for Set Partitioning in Hierarchical Trees (SPIHT) image transmission. For the wireless communication part, we consider the Audio Visual PHY Ultra Wide Band IEEE 802.15.3c system. The proposed strategies rely on adaptive process applied for error protection and the modulation operations. Thus, error correcting codes for unequal error protection (UEP) of the compressed bit streams is included. Then, Hierarchical Modulation (HM) is applied to the different bits according to their importance levels. Full of simulations are performed and our results show image quality improvements at the receiver using multilevel UEP and Hierarchical Modulation compared to the ordinary joint source-channel coding system without introducing any extra bandwidth usage.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122828488","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 : 2019-10-01DOI: 10.1109/mms48040.2019.9157266
Radhoine Aloui, Z. Houaneb, I. Llamas-Garro, H. Zairi
In this paper, two different types of graphene based rectangular patch antennas are designed for broadband terahertz applications. In the first step, we have modeled an antenna patch by copper metal for terahertz applications. The simulation results have a bad reflection coefficient according to used copper metal. To improvement this results an important graphene material have a good conductivity can be work in the second step. Time domain solver of CST MWS software is used to evaluate the performances of SIW patch antenna. The results obtained from CST are compared with that from HFSS to further validate the design.
{"title":"Terahertz Substrate Integrated Waveguide Wideband Antenna for Medical Imaging and Satellite Communications Applications","authors":"Radhoine Aloui, Z. Houaneb, I. Llamas-Garro, H. Zairi","doi":"10.1109/mms48040.2019.9157266","DOIUrl":"https://doi.org/10.1109/mms48040.2019.9157266","url":null,"abstract":"In this paper, two different types of graphene based rectangular patch antennas are designed for broadband terahertz applications. In the first step, we have modeled an antenna patch by copper metal for terahertz applications. The simulation results have a bad reflection coefficient according to used copper metal. To improvement this results an important graphene material have a good conductivity can be work in the second step. Time domain solver of CST MWS software is used to evaluate the performances of SIW patch antenna. The results obtained from CST are compared with that from HFSS to further validate the design.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114373320","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 : 2019-10-01DOI: 10.1109/mms48040.2019.9157296
S. Ali, Chérif Adnen
We will present an RSA algorithm designed for remote visualization of medical images with data security transfer. This interface is implemented under MATLAB environment. The implementation of the image cryptography system uses the RSA algorithm with 64 bits private key length. The transfer of images in a secure way for medical diagnosis is insured by generating a watermarked key to encrypt the original image. More, we introduced a comparison study between the obtained performances and those computed with other algorithms such as AES, DES and IDEA.
{"title":"Implementation of a Cryptograpgy Algorithm for Image Transmission","authors":"S. Ali, Chérif Adnen","doi":"10.1109/mms48040.2019.9157296","DOIUrl":"https://doi.org/10.1109/mms48040.2019.9157296","url":null,"abstract":"We will present an RSA algorithm designed for remote visualization of medical images with data security transfer. This interface is implemented under MATLAB environment. The implementation of the image cryptography system uses the RSA algorithm with 64 bits private key length. The transfer of images in a secure way for medical diagnosis is insured by generating a watermarked key to encrypt the original image. More, we introduced a comparison study between the obtained performances and those computed with other algorithms such as AES, DES and IDEA.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121649034","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 : 2019-10-01DOI: 10.1109/mms48040.2019.9157255
H. Hallabia, A. Hamida
In this paper, we propose a novel method based on latent low-rank representation theory (LatLRD) for pansharpening, which aims to synthesize a high resolution multispectral (MS) image from a high resolution panchromatic (PAN) image and a low resolution MS image. Exploiting the property of the low-rank of the MS data, the LatLRD is first performed on the up-sampled MS image and the PAN image to reconstruct a composite image in order to preserve the spectral fidelity of MS images, while transferring spatial structures. Second, a multi-scale procedure is applied to the generated composite image from the LatLRD decomposition for extracting the spatial information. Finally, the details are injected to the up-sampled MS bands to obtain the corresponding MS image at fine resolution. Experimental results demonstrate that the proposed approach performs better than several state-of-the-art methods in enhancing the spatial quality and preserving the spectral fidelity.
{"title":"A Pan-Sharpening Method based Latent Low-Rank Decomposition Model","authors":"H. Hallabia, A. Hamida","doi":"10.1109/mms48040.2019.9157255","DOIUrl":"https://doi.org/10.1109/mms48040.2019.9157255","url":null,"abstract":"In this paper, we propose a novel method based on latent low-rank representation theory (LatLRD) for pansharpening, which aims to synthesize a high resolution multispectral (MS) image from a high resolution panchromatic (PAN) image and a low resolution MS image. Exploiting the property of the low-rank of the MS data, the LatLRD is first performed on the up-sampled MS image and the PAN image to reconstruct a composite image in order to preserve the spectral fidelity of MS images, while transferring spatial structures. Second, a multi-scale procedure is applied to the generated composite image from the LatLRD decomposition for extracting the spatial information. Finally, the details are injected to the up-sampled MS bands to obtain the corresponding MS image at fine resolution. Experimental results demonstrate that the proposed approach performs better than several state-of-the-art methods in enhancing the spatial quality and preserving the spectral fidelity.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"17 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131773739","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 : 2019-10-01DOI: 10.1109/mms48040.2019.9157308
M. Jomaa, F. Tadeo, A. Mami
This research is devoted to the modelling of the air temperature and the relative humidity in a greenhouses, for this we have presented in details the different sensors used to control the external and internal environment and we have developed a physical model using the Simulink/Matlab environment to simulate both the temperature and the internal humidity of the greenhouse. A significant result of the modelling and the experimental validation of the greenhouse systems are presented.
{"title":"Modeling and experimental validation of the agricultural greenhouse","authors":"M. Jomaa, F. Tadeo, A. Mami","doi":"10.1109/mms48040.2019.9157308","DOIUrl":"https://doi.org/10.1109/mms48040.2019.9157308","url":null,"abstract":"This research is devoted to the modelling of the air temperature and the relative humidity in a greenhouses, for this we have presented in details the different sensors used to control the external and internal environment and we have developed a physical model using the Simulink/Matlab environment to simulate both the temperature and the internal humidity of the greenhouse. A significant result of the modelling and the experimental validation of the greenhouse systems are presented.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130517827","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 : 2019-10-01DOI: 10.1109/mms48040.2019.9157292
H. Messaoudi, T. Aguili
Due to the rapid growth in the use of wireless communication systems, there has been a recent increase in public concern regarding the exposure of humans to Radio Frequency (RF) electromagnetic radiation. This is particularly evident in the case of mobile telephone handsets. Previously, the insertion of a ferrite sheet between the antenna and the human head, the use of conductive materials (such as aluminum), the use of metamaterials (SRR), frequency selective surface (FSS), and electromagnetic bandgap (EBG) structures to design high performance devices were proposed as methods of reducing the SAR value. This paper aims to provide an investigation of the effectiveness of various available Specific Absorption Rate (SAR) reduction solutions.
{"title":"SAR Reduction in the Human Head Model using Metamaterials","authors":"H. Messaoudi, T. Aguili","doi":"10.1109/mms48040.2019.9157292","DOIUrl":"https://doi.org/10.1109/mms48040.2019.9157292","url":null,"abstract":"Due to the rapid growth in the use of wireless communication systems, there has been a recent increase in public concern regarding the exposure of humans to Radio Frequency (RF) electromagnetic radiation. This is particularly evident in the case of mobile telephone handsets. Previously, the insertion of a ferrite sheet between the antenna and the human head, the use of conductive materials (such as aluminum), the use of metamaterials (SRR), frequency selective surface (FSS), and electromagnetic bandgap (EBG) structures to design high performance devices were proposed as methods of reducing the SAR value. This paper aims to provide an investigation of the effectiveness of various available Specific Absorption Rate (SAR) reduction solutions.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123066805","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 : 2019-10-01DOI: 10.1109/mms48040.2019.9157287
Wided Abidi, Djamal Djabour, T. Ezzedine
A Wireless sensor network is a collection of sensor nodes which are limited energy resources. Therefore, the main issue is how to optimize the energy consumption to maintain the sensor nodes alive as long as possible. In this paper, we propose a new algorithm that divides the network area to zones and uses the fuzzy logic method to select Cluster Heads (CHs). To this aim, we have taken into account a set of parameters related to the node for selecting CHs. These parameters are used as inputs to the Fuzzy Inference System. Simu-lation results show that our algorithm succeeds to increase the stability period, save the energy and hence, prolong the lifetime of the network.
{"title":"Zone based Algorithm for CH Selection using Fuzzy logic for Heterogeneous Wireless Sensor Networks","authors":"Wided Abidi, Djamal Djabour, T. Ezzedine","doi":"10.1109/mms48040.2019.9157287","DOIUrl":"https://doi.org/10.1109/mms48040.2019.9157287","url":null,"abstract":"A Wireless sensor network is a collection of sensor nodes which are limited energy resources. Therefore, the main issue is how to optimize the energy consumption to maintain the sensor nodes alive as long as possible. In this paper, we propose a new algorithm that divides the network area to zones and uses the fuzzy logic method to select Cluster Heads (CHs). To this aim, we have taken into account a set of parameters related to the node for selecting CHs. These parameters are used as inputs to the Fuzzy Inference System. Simu-lation results show that our algorithm succeeds to increase the stability period, save the energy and hence, prolong the lifetime of the network.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123711592","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 : 2019-10-01DOI: 10.1109/mms48040.2019.9157290
Rihem Noumi, J. Macháč, A. Gharsallah
In this study, a novel tunable CL CRLH leaky wave antenna is designed using both substrate integrated waveguide and meta-materials technologies. This structure is loading by 25 CRLH meta-materials unit cells and fed by a tapered microstrip line transition. This antenna is simulated and analyzed by the CST Microwave Studio software. The simulated results indicating that by tuning the permittivity tensor of the LC materials, it is possible to obtain a wide scanning range from backward to forward direction including broadside at the fixed frequency 14.2 GHz.
{"title":"Tunable Liquid Crystal MTM SIW LWA for continuous scanning at fixed frequency","authors":"Rihem Noumi, J. Macháč, A. Gharsallah","doi":"10.1109/mms48040.2019.9157290","DOIUrl":"https://doi.org/10.1109/mms48040.2019.9157290","url":null,"abstract":"In this study, a novel tunable CL CRLH leaky wave antenna is designed using both substrate integrated waveguide and meta-materials technologies. This structure is loading by 25 CRLH meta-materials unit cells and fed by a tapered microstrip line transition. This antenna is simulated and analyzed by the CST Microwave Studio software. The simulated results indicating that by tuning the permittivity tensor of the LC materials, it is possible to obtain a wide scanning range from backward to forward direction including broadside at the fixed frequency 14.2 GHz.","PeriodicalId":373813,"journal":{"name":"2019 IEEE 19th Mediterranean Microwave Symposium (MMS)","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131718445","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：