Pub Date : 2013-12-01DOI: 10.1109/INDCON.2013.6725942
K. Buch, A. Darji
Modern day radio-telescopes need extremely sensitive receivers combined with powerful signal processing capabilities. Rapid urbanization and proliferation of communication devices has made these telescopes vulnerable to increasingly high levels of Radio Frequency Interference (RFI). This has necessitated development of algorithms for the mitigation of the effects of RFI either in real time or during post processing. The performance of different algorithms can be verified using RFI emulator. The paper proposes a programmable and versatile RFI emulator architecture optimized for hardware platform for generating the signals with different types of interference as received by the wide-band signal processing chain. The design parameters for this RFI emulator have been arrived at as an optimal trade-off between the functional requirements and hardware utilization. The implementation of RFI emulator has been carried out on FPGA and the results of built-in testing of RFI mitigation logic using RFI emulator are provided.
{"title":"FPGA-based emulator for functional verification of radio frequency interference mitigation algorithms","authors":"K. Buch, A. Darji","doi":"10.1109/INDCON.2013.6725942","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6725942","url":null,"abstract":"Modern day radio-telescopes need extremely sensitive receivers combined with powerful signal processing capabilities. Rapid urbanization and proliferation of communication devices has made these telescopes vulnerable to increasingly high levels of Radio Frequency Interference (RFI). This has necessitated development of algorithms for the mitigation of the effects of RFI either in real time or during post processing. The performance of different algorithms can be verified using RFI emulator. The paper proposes a programmable and versatile RFI emulator architecture optimized for hardware platform for generating the signals with different types of interference as received by the wide-band signal processing chain. The design parameters for this RFI emulator have been arrived at as an optimal trade-off between the functional requirements and hardware utilization. The implementation of RFI emulator has been carried out on FPGA and the results of built-in testing of RFI mitigation logic using RFI emulator are provided.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133226041","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 : 2013-12-01DOI: 10.1109/INDCON.2013.6725914
V. Naidu, Raj Kumar
A compact (25.4mm × 25.4mm) coplanar waveguide fed dual band antenna for GSM/Wi-Fi/ WLAN applications is presented in this paper. The proposed antenna has a simple structure which consists of two asymmetric stepped strips, which is printed on a commercially cheap FR4 substrate. It exhibits dualband operations in the range of 1.2-1.9GHz and 3.5-6GHz with satisfactory radiation properties. The threshold 10-dB return loss bandwidth of the antenna at low-band is 700MHz and high band is 3500MHz. The antenna displays a stable radiation pattern and a moderately high gain of around 1-5 dB in the useful band.
{"title":"Design of miniature CPW-Fed dual band antenna using coupling strips for GSM/Wi-Fi/WLAN applications","authors":"V. Naidu, Raj Kumar","doi":"10.1109/INDCON.2013.6725914","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6725914","url":null,"abstract":"A compact (25.4mm × 25.4mm) coplanar waveguide fed dual band antenna for GSM/Wi-Fi/ WLAN applications is presented in this paper. The proposed antenna has a simple structure which consists of two asymmetric stepped strips, which is printed on a commercially cheap FR4 substrate. It exhibits dualband operations in the range of 1.2-1.9GHz and 3.5-6GHz with satisfactory radiation properties. The threshold 10-dB return loss bandwidth of the antenna at low-band is 700MHz and high band is 3500MHz. The antenna displays a stable radiation pattern and a moderately high gain of around 1-5 dB in the useful band.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133397157","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 : 2013-12-01DOI: 10.1109/INDCON.2013.6725980
D. Ananth, G. V. Kumar, T. Gayathri
Rapid reactive power control for Doubly Fed Induction Generator (DFIG) is necessary for stable operation during voltage control and grid fault conditions. This paper examines the performance of DFIG under three cases viz., i) generator speed, ii) reactive power demand from grid and iii) wind speed. Based on the above disturbances, the system performance is analyzed by considering the parameters like rotor speed, generator torque, stator and rotor voltages and powers. It is also aims to explain DFIG as a vital dynamic reactive power source without the use of any additional external reactive power devices. The simulation results illustrate the efficacy and robustness of torque, speed and stator reactive power control for DFIG system by the proposed methodology. The torque surges are minimum even there is sudden change in wind speed, torque ripples and speed surges are not there when there is sudden change in wind speed.
{"title":"Analysis and design of enhanced real and reactive power control schemes for grid connected Doubly Fed Induction Generator","authors":"D. Ananth, G. V. Kumar, T. Gayathri","doi":"10.1109/INDCON.2013.6725980","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6725980","url":null,"abstract":"Rapid reactive power control for Doubly Fed Induction Generator (DFIG) is necessary for stable operation during voltage control and grid fault conditions. This paper examines the performance of DFIG under three cases viz., i) generator speed, ii) reactive power demand from grid and iii) wind speed. Based on the above disturbances, the system performance is analyzed by considering the parameters like rotor speed, generator torque, stator and rotor voltages and powers. It is also aims to explain DFIG as a vital dynamic reactive power source without the use of any additional external reactive power devices. The simulation results illustrate the efficacy and robustness of torque, speed and stator reactive power control for DFIG system by the proposed methodology. The torque surges are minimum even there is sudden change in wind speed, torque ripples and speed surges are not there when there is sudden change in wind speed.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"307 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133889233","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 : 2013-12-01DOI: 10.1109/INDCON.2013.6725952
U. Datta, P. K. Sahu, S. Kundu
Energy conservation is one of the most important issues in wireless ad hoc and sensor networks, where nodes are likely to rely on limited battery power. This paper analyzes the performance of a CDMA WSN, in terms of lifetime of the network, where nodes are placed in a random fashion. A routing protocol is proposed and simulated where selection of intermediate nodes is governed by a parameter which combines the estimation of detection probability of neighbors in presence of large scale fading, and maximum advanced distance with respect to the final destination. Further, the proposed routing scheme is modified by incorporating route diversity. Lifetimes are analyzed in both the cases and compared. Effects of detection probability, shadowing, and route diversity on lifetime are investigated.
{"title":"Lifetime of a CDMA wireless sensor network with route diversity","authors":"U. Datta, P. K. Sahu, S. Kundu","doi":"10.1109/INDCON.2013.6725952","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6725952","url":null,"abstract":"Energy conservation is one of the most important issues in wireless ad hoc and sensor networks, where nodes are likely to rely on limited battery power. This paper analyzes the performance of a CDMA WSN, in terms of lifetime of the network, where nodes are placed in a random fashion. A routing protocol is proposed and simulated where selection of intermediate nodes is governed by a parameter which combines the estimation of detection probability of neighbors in presence of large scale fading, and maximum advanced distance with respect to the final destination. Further, the proposed routing scheme is modified by incorporating route diversity. Lifetimes are analyzed in both the cases and compared. Effects of detection probability, shadowing, and route diversity on lifetime are investigated.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"43 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114023579","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 : 2013-12-01DOI: 10.1109/INDCON.2013.6726110
D. Roy, R. Chaki
Mobile ad hoc networks are highly vulnerable to attacks due to infrastructure less environment. The features of MANETs are like open media, dynamic changes in topology, cooperative and collaborative algorithm and no centralized monitoring system. These features make the network more prone to malicious attack. The traditional way of protecting networks with firewalls and encryption software is no longer sufficient and effective for those features. In this paper, we present a new cluster based intrusion detection algorithm that takes care of black hole attacks in a MANET. This proposed algorithm is based on trustworthiness of the nodes in a network. The network is considered to be a layered structured. The nodes are member of a cluster. Each cluster has cluster head that takes care of all the members of its own cluster and communicates with cluster head at layer 2 whenever required. The cluster head at layer 2 communicate with all cluster head at layer 1. The selection of cluster head depends on three parameters battery power, mobility and trust value of a node in a cluster. Periodically the cluster head updation is done according to three parameters. We have implemented our algorithm using the NS simulator. The performance of the proposed Intrusion Detection System (IDS) has also been evaluated in the process. The performance graph shows marked improvement as far as packet dropping is concerned.
{"title":"MCBHIDS: Modified layered cluster based algorithm for black hole IDS","authors":"D. Roy, R. Chaki","doi":"10.1109/INDCON.2013.6726110","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6726110","url":null,"abstract":"Mobile ad hoc networks are highly vulnerable to attacks due to infrastructure less environment. The features of MANETs are like open media, dynamic changes in topology, cooperative and collaborative algorithm and no centralized monitoring system. These features make the network more prone to malicious attack. The traditional way of protecting networks with firewalls and encryption software is no longer sufficient and effective for those features. In this paper, we present a new cluster based intrusion detection algorithm that takes care of black hole attacks in a MANET. This proposed algorithm is based on trustworthiness of the nodes in a network. The network is considered to be a layered structured. The nodes are member of a cluster. Each cluster has cluster head that takes care of all the members of its own cluster and communicates with cluster head at layer 2 whenever required. The cluster head at layer 2 communicate with all cluster head at layer 1. The selection of cluster head depends on three parameters battery power, mobility and trust value of a node in a cluster. Periodically the cluster head updation is done according to three parameters. We have implemented our algorithm using the NS simulator. The performance of the proposed Intrusion Detection System (IDS) has also been evaluated in the process. The performance graph shows marked improvement as far as packet dropping is concerned.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122367303","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 : 2013-12-01DOI: 10.1109/INDCON.2013.6726089
Solwin Johnson, Arun A. Balakrishnan
In this paper, a new denoising and contrast enhancement method for DTI is proposed. Noise removal is given priority in existing denoising methods. In order to increase the visibility of structural details, contrast enhancement methods has to be used. In proposed method, a non-linear adaptive Gaussian denoising filter removes noises from the DTI. To increase the visibility of filtered micro structural details, a contrast enhancement method is also used. The proposed method is compared with the existing scalar Partial Differential Equation (PDE) and non local means (NLM) denoising methods. Quantitative measures are used for validating the efficiency of the proposed contrast enhancement method. The experiment results shows that the proposed method outperforms the scalar PDE method and NLM method.
{"title":"Contrast enhancement based denoising method in diffusion tensor imaging","authors":"Solwin Johnson, Arun A. Balakrishnan","doi":"10.1109/INDCON.2013.6726089","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6726089","url":null,"abstract":"In this paper, a new denoising and contrast enhancement method for DTI is proposed. Noise removal is given priority in existing denoising methods. In order to increase the visibility of structural details, contrast enhancement methods has to be used. In proposed method, a non-linear adaptive Gaussian denoising filter removes noises from the DTI. To increase the visibility of filtered micro structural details, a contrast enhancement method is also used. The proposed method is compared with the existing scalar Partial Differential Equation (PDE) and non local means (NLM) denoising methods. Quantitative measures are used for validating the efficiency of the proposed contrast enhancement method. The experiment results shows that the proposed method outperforms the scalar PDE method and NLM method.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123053495","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 : 2013-12-01DOI: 10.1109/INDCON.2013.6725855
Chetan K. Lad, R. Chudamani
Determination of commutation instant is essential for the control of brushless DC motor (BLDC) drive. Conventionally hall sensors have been used to derive commutation instants. Use of position sensors has its own merits and demerits. In order to overcome the limitations of position sensor based drives, sensorless techniques are used for control of BLDC motor. The detection of the zero-crossing of the back-EMF is a widely used method for sensorless control. The commutation instants are derived from the information of zero crossing point of the back EMF. Several algorithms have been proposed in literature for the detection of back EMF zero crossing. In this paper a novel method for determining the commutation instants directly from the comparison of the line-to-line voltages and their difference voltages is presented. The performance of the BLDC drive with the proposed algorithm is studied and verified through simulation done in MATLAB/SIMULINK environment.
{"title":"Sensorless brushless DC motor drive based on commutation instants derived from the line voltages and line voltage differences","authors":"Chetan K. Lad, R. Chudamani","doi":"10.1109/INDCON.2013.6725855","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6725855","url":null,"abstract":"Determination of commutation instant is essential for the control of brushless DC motor (BLDC) drive. Conventionally hall sensors have been used to derive commutation instants. Use of position sensors has its own merits and demerits. In order to overcome the limitations of position sensor based drives, sensorless techniques are used for control of BLDC motor. The detection of the zero-crossing of the back-EMF is a widely used method for sensorless control. The commutation instants are derived from the information of zero crossing point of the back EMF. Several algorithms have been proposed in literature for the detection of back EMF zero crossing. In this paper a novel method for determining the commutation instants directly from the comparison of the line-to-line voltages and their difference voltages is presented. The performance of the BLDC drive with the proposed algorithm is studied and verified through simulation done in MATLAB/SIMULINK environment.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123964525","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 : 2013-12-01DOI: 10.1109/INDCON.2013.6725969
B. Rao, K. Vaisakh
This paper presents an artificial immune system (AIS) based adaptive clonal selection algorithm (ACSA) to solve combined economic emission dispatch (EED) problem of thermal units in power system. In this work different emission substances like NOX and SOX are considered along with power demand equality constraints and thermal unit operating limits. The clonal selection principle is one of the models used to incorporate the behaviour of the AIS. The biological principles like clone generation, proliferation and maturation are mimicked and incorporated into this algorithm. In order to find and manage the pareto optimal set a non dominated sorting technique and crowding distance measure have been used. The proposed multi-objective ACSA (MOACSA) method has been tested on two different test systems and the results are compared with other methods reported in literature.
{"title":"Adaptive clonal selection algorithm for solving OPF problem with emission constraints","authors":"B. Rao, K. Vaisakh","doi":"10.1109/INDCON.2013.6725969","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6725969","url":null,"abstract":"This paper presents an artificial immune system (AIS) based adaptive clonal selection algorithm (ACSA) to solve combined economic emission dispatch (EED) problem of thermal units in power system. In this work different emission substances like NOX and SOX are considered along with power demand equality constraints and thermal unit operating limits. The clonal selection principle is one of the models used to incorporate the behaviour of the AIS. The biological principles like clone generation, proliferation and maturation are mimicked and incorporated into this algorithm. In order to find and manage the pareto optimal set a non dominated sorting technique and crowding distance measure have been used. The proposed multi-objective ACSA (MOACSA) method has been tested on two different test systems and the results are compared with other methods reported in literature.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127760747","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 : 2013-12-01DOI: 10.1109/INDCON.2013.6726150
Milind Fernandes, Aniket Bhandare, Chetan Dessai, H. Virani
In this paper a Switched beam 4×1 linear antenna array is presented with a 4×4 Butler matrix feed. For wideband operation Aperture coupled antenna elements are used in the array whereas wideband Hybrid couplers and Cross Couplers are used in the Butler Matrix feed. Design and Simulations are carried out in IE3D software considering a low cost FR4 substrate. The array is designed to cover LTE bands at 2.3 & 2.6GHz as well as the 2.4GHz ISM band. The performance parameters from simulation and measurements are presented and analyzed. A total 1:1.3 VSWR bandwidth of 400MHz is obtained with gain between 6-7.5dB, directivity of ~12dBi and Efficiency greater than 30%. The radiation beam directions in azimuth are obtained at +15, -15, +45 and -45° for respective input port.
{"title":"A wideband switched beam patch antenna array for LTE and Wi-Fi","authors":"Milind Fernandes, Aniket Bhandare, Chetan Dessai, H. Virani","doi":"10.1109/INDCON.2013.6726150","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6726150","url":null,"abstract":"In this paper a Switched beam 4×1 linear antenna array is presented with a 4×4 Butler matrix feed. For wideband operation Aperture coupled antenna elements are used in the array whereas wideband Hybrid couplers and Cross Couplers are used in the Butler Matrix feed. Design and Simulations are carried out in IE3D software considering a low cost FR4 substrate. The array is designed to cover LTE bands at 2.3 & 2.6GHz as well as the 2.4GHz ISM band. The performance parameters from simulation and measurements are presented and analyzed. A total 1:1.3 VSWR bandwidth of 400MHz is obtained with gain between 6-7.5dB, directivity of ~12dBi and Efficiency greater than 30%. The radiation beam directions in azimuth are obtained at +15, -15, +45 and -45° for respective input port.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128993231","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 : 2013-12-01DOI: 10.1109/INDCON.2013.6725901
Sonal Singh, R. Negi, B. Pratap
This paper investigates the nonlinear controller design of a half car suspension system. The half car suspension system is a multiple-input-multiple-output (MIMO) nonlinear system. The proposed controller design is based on a feedback linearization method. Its prime goal is the coordinated control of ride quality and handling performance which are nowadays challenging for suspension systems, for the applications on unpaved roads. The tracking performance of the proposed control technique in the presence of the deterministic road disturbance has been illustrated using simulation results.
{"title":"Nonlinear feedback linearization controller design for half car suspension system","authors":"Sonal Singh, R. Negi, B. Pratap","doi":"10.1109/INDCON.2013.6725901","DOIUrl":"https://doi.org/10.1109/INDCON.2013.6725901","url":null,"abstract":"This paper investigates the nonlinear controller design of a half car suspension system. The half car suspension system is a multiple-input-multiple-output (MIMO) nonlinear system. The proposed controller design is based on a feedback linearization method. Its prime goal is the coordinated control of ride quality and handling performance which are nowadays challenging for suspension systems, for the applications on unpaved roads. The tracking performance of the proposed control technique in the presence of the deterministic road disturbance has been illustrated using simulation results.","PeriodicalId":313185,"journal":{"name":"2013 Annual IEEE India Conference (INDICON)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116369140","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：