公共管理高层论坛最新文献_第3页

Distributed MIMO Systems for 6G 6G分布式MIMO系统

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188355

Omer Haliloglu, Han Yu, Charitha Madapatha, Hao Guo, Fehmí Emre Kadan, A. Wolfgang, R. Puerta, P. Frenger, T. Svensson

{"title":"Distributed MIMO Systems for 6G","authors":"Omer Haliloglu, Han Yu, Charitha Madapatha, Hao Guo, Fehmí Emre Kadan, A. Wolfgang, R. Puerta, P. Frenger, T. Svensson","doi":"10.1109/EuCNC/6GSummit58263.2023.10188355","DOIUrl":"https://doi.org/10.1109/EuCNC/6GSummit58263.2023.10188355","url":null,"abstract":"This study focuses on Distributed MIMO (D-MIMO) systems and provides a discussion about their role in next generation networks. The paradigm shift to distributed networks offers great potential to address the 6G requirements, through macro diversity. As 6G scenarios and use cases continue to emerge, new challenges are likely to arise that may affect the widespread imp-lementation of D-MIMO. To address those, different deployment options have been proposed for roll-out considerations. They are composed of several sub-components that can be categorized as (i) wireless or wired fronthaul/backhaul, (ii) analog or digital signals, (iii) distributed or centralized processing, and (iv) coherent or non-coherent transmission. To facilitate standardization efforts, we provide 3GPP-aligned terminology for network nodes, multi-point transmission and reception schemes. In order to enable large-scale implementation of D-MIMO systems, it is important to determine the needed amount of distribution, develop practical solutions for high-frequency bands, and ways to convey data that meet the transport requirements. On this regard, we discuss key enablers and present simulation results for D-MIMO systems towards 6G. In particular, we present solutions for D-MIMO networks in dynamic scenarios related to channel estimation and layer-l mobility considering coherent and non-coherent joint transmission, and analog fronthaul implementation using analog-radio-over-fiber that are promising for high (upper mm-Wave and (sub-)THz) carrier frequencies, as well as integrated access and backhaul, network-controlled repeaters, and reconfigurable intelligent surfaces that are possible enablers for cost-efficient network densification at both low (cm-Wave, lower mm-Wave) and high carrier frequencies.","PeriodicalId":65870,"journal":{"name":"公共管理高层论坛","volume":"60 1","pages":"156-161"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91013679","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}

引用次数: 0

Secrecy Energy Efficiency in PAPR-Aware Artificial Noise Scheme for Secure Massive MIMO 安全大规模MIMO中papr感知人工噪声方案的保密能量效率

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188263

I. Ajayi, Y. Medjahdi, L. Mroueh, R. Zayani, F. Kaddour

{"title":"Secrecy Energy Efficiency in PAPR-Aware Artificial Noise Scheme for Secure Massive MIMO","authors":"I. Ajayi, Y. Medjahdi, L. Mroueh, R. Zayani, F. Kaddour","doi":"10.1109/EuCNC/6GSummit58263.2023.10188263","DOIUrl":"https://doi.org/10.1109/EuCNC/6GSummit58263.2023.10188263","url":null,"abstract":"In this paper, we study the secrecy energy efficiency (SEE) in an artificial noise (AN)-aided secure massive multiple-input multiple-output (MIMO) scheme. The scheme uses instantaneous information to design a peak-to-average power (PAPR)-aware AN that simultaneously improves secrecy and reduces PAPR. High PAPR leads to non-linear in-band signal distortion and out-of-band radiation causing adjacent channel interference. To ensure optimal secrecy performance, high power amplifiers (HPAs) at the base station (BS) are backed off to operate in the linear region only. The amount of back-off needed to ensure linearity of the HPA has a direct impact on the energy efficiency of the system and by extension the SEE. For our scheme, the magnitude of this back-off is determined by the power allocation ratio between the data and AN. Hence, we propose an optimal power allocation ratio for the scheme. This is to ensure a good trade-off between the energy efficiency, security, and reliability of the system. Simulation results show a better SEE performance for our scheme compared to legacy massive MIMO schemes with or without random AN injection. Finally, we study the impact of spatially correlated Rayleigh fading on the proposed scheme.","PeriodicalId":65870,"journal":{"name":"公共管理高层论坛","volume":"27 1","pages":"42-47"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80142639","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}

引用次数: 0

Reduced Complexity Multicast Beamforming and User Grouping for Multi-Antenna Coded Caching 基于多天线编码缓存的低复杂度组播波束形成和用户分组

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188253

Shanuka R. Gamaethige, H. Mahmoodi, M. Salehi, H. Suraweera, Antti Tölli

{"title":"Reduced Complexity Multicast Beamforming and User Grouping for Multi-Antenna Coded Caching","authors":"Shanuka R. Gamaethige, H. Mahmoodi, M. Salehi, H. Suraweera, Antti Tölli","doi":"10.1109/EuCNC/6GSummit58263.2023.10188253","DOIUrl":"https://doi.org/10.1109/EuCNC/6GSummit58263.2023.10188253","url":null,"abstract":"A new user-grouping method for multi antenna coded caching (CC) is proposed, able to simultaneously exploit spatial multiplexing, multicasting, and global caching gains. The proposed scheme achieves the theoretical optimal sum degrees of freedom (DoF) and can be applied to networks with any number of users K, transmit antennas L, and global CC gain t. The proposed scheme comprises both multicast and unicast transmissions wherein a suitable combination of messages is chosen exploiting a tree diagram structure thus guaranteeing symmetric transmission of data for any given set of network parameters. The same structure also removes the successive interference cancellation requirement at the receivers, thus enabling a simple linear design for optimized beamformers. Moreover, even though the proposed scheme in general requires a larger subpacketization than the original single antenna CC scheme, for the particular case of $frac{t+L}{t+1}in mathbb{N}$, it works with exactly the same subpacketization value. Finally, the achievability of the proposed scheme is proven, and in the simulations, it is demonstrated that the complexity of the transmitter and receiver implementations can be greatly reduced with only a modest performance loss.","PeriodicalId":65870,"journal":{"name":"公共管理高层论坛","volume":"75 1","pages":"222-227"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80971847","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}

引用次数: 0

A Service-Aware Autoscaling Strategy for Container Orchestration Platforms with Soft Resource Isolation 具有软资源隔离的容器编排平台的服务感知自动伸缩策略

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188268

F. Tonini, C. Natalino, D. Temesgene, Z. Ghebretensae, L. Wosinska, P. Monti

{"title":"A Service-Aware Autoscaling Strategy for Container Orchestration Platforms with Soft Resource Isolation","authors":"F. Tonini, C. Natalino, D. Temesgene, Z. Ghebretensae, L. Wosinska, P. Monti","doi":"10.1109/EuCNC/6GSummit58263.2023.10188268","DOIUrl":"https://doi.org/10.1109/EuCNC/6GSummit58263.2023.10188268","url":null,"abstract":"Container orchestration platforms like Kubernetes (K8s) allow easy deployment and management of cloud native services. When deploying their services, service providers need to specify a proper amount of resources to K8s, so that the desired Quality of Service (QoS) to their users can be maintained. To cope with the varying traffic demand coming from users, they can rely on the K8s Horizontal Pod Autoscaling (HPA) mechanism. To ensure that enough resources are available when needed, the standard HPA mechanism relies on resource overprovisioning. In this way, the required QoS is achieved most of (or all) the time but at the expense of additional resources that are allocated (and charged for), while they may stay idle for significant periods of time. A way to reduce overprovisioning is provided by the soft resource isolation of K8s, which allows services to compensate for a temporary lack of resources with shared resources, i.e., idle resources of the machines where services are running. However, during traffic spikes, these idle resources may not be enough to serve the whole demand, degrading the QoS. The HPA, which is not aware of how much demand could not be served, is not always able to correctly estimate the required additional resources, further degrading the QoS. To overcome this, service providers need to leverage overprovisioning, limiting the use of shared resources. In this paper, we propose a novel mechanism for autoscaling resources in K8s that relies on service-related data to avoid the additional degradation introduced by the HPA. The proposed strategy also offers a way to tune overprovisioning and shared resources. Simulation results show that our approach can reduce idle resources by up to 60% compared with the HPA mechanism.","PeriodicalId":65870,"journal":{"name":"公共管理高层论坛","volume":"17 1","pages":"454-459"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81720193","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}

引用次数: 1

A wideband reduced form factor antenna for 5G SAWAP applications 用于5G SAWAP应用的宽带缩小尺寸天线

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188276

T. E. Oliveira, J. Reis, T. Fernandes, Samuel Madail, José Salgado, R. Caldeirinha

{"title":"A wideband reduced form factor antenna for 5G SAWAP applications","authors":"T. E. Oliveira, J. Reis, T. Fernandes, Samuel Madail, José Salgado, R. Caldeirinha","doi":"10.1109/EuCNC/6GSummit58263.2023.10188276","DOIUrl":"https://doi.org/10.1109/EuCNC/6GSummit58263.2023.10188276","url":null,"abstract":"In this paper, a wideband antenna for 5G Small-Area Wireless Access Points (SAWAPs) applications is presented. The proposed antenna is designed to fulfil strict project require-ments, namely, to operate in the 5G FR1 n78 frequency band, and to have a reduced form factor, so it can easily be integrated in existing street furniture. The proposed antenna layout resembles a typical inset feed microstrip patch with etched ground plane. In particular, the slot opened in the bottom plane allows to improve the bandwidth up to 15%, when comparing with a standard microstrip patch antenna. A thorough simulation workout is presented to better comprehend how the main design parameters affect the antenna performance, and ultimately, to properly tune the antenna. After optimisation in CST MWS, an antenna with overall dimension of $30times 30mm^{2}$, designed in Rogers 4350B substrate, presents a total bandwidth of 585 MHz (15%), defined from 3.35 to 3.935 GHz, with an omnidirectional radiation pattern with a realised gain of 2.34 dBi. Furthermore, the proposed antenna layout is also optimised to operate inside a plastic enclosure backed by a metallic plate. According to simulations, the final antenna model presents an optimised bandwidth of 400 MHz and a realized gain of 5.03 dBi, at 3.6 GHz.","PeriodicalId":65870,"journal":{"name":"公共管理高层论坛","volume":"4 1","pages":"606-610"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83618679","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}

引用次数: 1

Real Time Assessments of DML and EML with 25G-class APD for Higher Speed PONs 基于25g级APD的高速pon的DML和EML实时评估

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188260

Georges Gaillard, F. Saliou, J. Potet, G. Simon, P. Chanclou, E. Durán-Valdeiglesias, L. Neto, Michel Morvan, B. Fracasso

{"title":"Real Time Assessments of DML and EML with 25G-class APD for Higher Speed PONs","authors":"Georges Gaillard, F. Saliou, J. Potet, G. Simon, P. Chanclou, E. Durán-Valdeiglesias, L. Neto, Michel Morvan, B. Fracasso","doi":"10.1109/EuCNC/6GSummit58263.2023.10188260","DOIUrl":"https://doi.org/10.1109/EuCNC/6GSummit58263.2023.10188260","url":null,"abstract":"This paper aims at assessing two types of optical transmitters as potential candidates to realize transmissions at 50 Gbit/s in the context of Higher Speed Passive Optical Networks (HS-PON). A Receiver Optical Sub-Assembly (ROSA) with a high bandwidth (25 GHz) Avalanche Photodiode with a Transimpedance Amplifier (APD-TIA) is proposed to achieve high optical budget required for this application. Thus, we demonstrate, real time transmission for HS-PON at 25 and 50 Gbit/s, performed with a Directly Modulated Laser (DML) composed of a Distributed Feedback laser (DFB), or an External Modulation Laser (EML) composed of a DFB, integrated with an Electro-Absorption Modulator (EAM) and optionally a Semiconductor Optical Amplifier (SOA). The transmission is realized with reduced complexity of equalization (pre-emphasis 3-taps in emission + Finite Impulse Response (FIR) filter 6-taps at the reception). A sensitivity of -29.4 dBm is obtained with a DML and 25 km of fiber at 25 Gbit/s and -22.7 dBm at 50 Gbit/s. The EML-SOA achieved a sensitivity of -27.8 and -24.4 dBm at 25 and 50 Gbit/s respectively. The results obtained open a perspective on the feasibility of HS-PON with DML at the emitter side, as a low-cost alternative to EML.","PeriodicalId":65870,"journal":{"name":"公共管理高层论坛","volume":"33 1","pages":"335-340"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90234021","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}

引用次数: 0

Performance Assessment of a 5GNR D-Band CMOS Transceiver with Phase Noise Impairments 相位噪声损害的5GNR d波段CMOS收发器性能评估

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188317

Yaya Bello, David Demmer, A. Hamani, A. Siligaris, C. Dehos, N. Cassiau, Jean-Baptiste Doré, J. L. Jiménez

{"title":"Performance Assessment of a 5GNR D-Band CMOS Transceiver with Phase Noise Impairments","authors":"Yaya Bello, David Demmer, A. Hamani, A. Siligaris, C. Dehos, N. Cassiau, Jean-Baptiste Doré, J. L. Jiménez","doi":"10.1109/EuCNC/6GSummit58263.2023.10188317","DOIUrl":"https://doi.org/10.1109/EuCNC/6GSummit58263.2023.10188317","url":null,"abstract":"Sub-THz bands offer a strong potential with their wide available bandwidths, which makes them a promising enabler for 6G. However, the channel propagation is challenging in those bands because of severe path loss attenuation. Hardware impairments are also strong especially phase noise (PN). Besides, silicon based components, which prevail in mobile systems thanks to their low production costs, reach their limits in such high frequencies. There is thus a need for specific solutions for both system designs and signal processing techniques. The contributions of the proposed work are multiple: (i) based on a CMOS D-Band transceiver, we measure and derive the stochastic properties of the transceiver PN and, (ii) we investigate and evaluate the performance of signal processing PN estimation and compensation techniques, with the measured PN for OFDM and DFT-s-OFDM waveforms. We demonstrate that the use of the proposed algorithm based on the statistic properties of the correlated nature of the PN, leads to a significant performance gain in DFT-s-OFDM systems. We consider a real measurement of the PN power spectral density and standard and extended 5G-NR numerologies.","PeriodicalId":65870,"journal":{"name":"公共管理高层论坛","volume":"2018 1","pages":"246-251"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85395007","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}

引用次数: 0

Frequency-Sensitive Soil Moisture Profiling Using WiFi Sensing 使用WiFi传感的频率敏感土壤湿度分析

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188284

Thanh Vinh Nguyen, Junye Li, Deepak Mishra, Aruna Seneviratne

{"title":"Frequency-Sensitive Soil Moisture Profiling Using WiFi Sensing","authors":"Thanh Vinh Nguyen, Junye Li, Deepak Mishra, Aruna Seneviratne","doi":"10.1109/EuCNC/6GSummit58263.2023.10188284","DOIUrl":"https://doi.org/10.1109/EuCNC/6GSummit58263.2023.10188284","url":null,"abstract":"In recent times, WiFi signals have been widely used in wireless sensing applications for detecting large-scale environmental or physical characteristics, like human count and ambient temperature. Soil moisture detection using WiFi sensing is gaining interest, but the key underlying challenge is to realise contact-free sensing technology that can characterise the impact of water spreading into the soil on the Channel State Information (CSI). Therefore, we develop a framework for sensing soil water levels using CSI- based sensing. We investigate the WiFi CSI signatures pertinent to the soil water infiltration, enabling applications including soil health monitoring. In our experimental study, we use the 5GHz WiFi spectrum to implement our novel frequency-selective CSI sensing framework for soil moisture profiling using commodity Raspberry Pi devices. The experimental results verified that specific WiFi Orthogonal Frequency Division Multiplexing (OFDM) subcarriers are more sensitive to the changes in soil moisture, leading to a frequency-sensitive behaviour on CSI. Our framework exploits the changes in the pressure levels due to the water movement or varying humidity levels in the soil channel between the WiFi transmitter and receiver that leave impressions on the underlying CSI. Furthermore, this paper demonstrates a novel approach by inspecting the CSI amplitude pattern of water entering the soil at a finer level. Lastly, in contrast to the existing works, our low-cost and contact-free method for detecting soil moisture detection has been empirically shown to efficiently utilise the newly-identified frequency-selective CSI signatures for the water infiltration and humidity levels in soil channel for accurate soil moisture prediction.","PeriodicalId":65870,"journal":{"name":"公共管理高层论坛","volume":"61 1","pages":"641-646"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84937856","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}

引用次数: 0

Scalable E-Band Waveguide Array Antennas for 5G and Beyond 用于5G及以后的可扩展e波段波导阵列天线

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188292

A. Gomez-Torrent, J. Campion, B. Beuerle

引用次数: 0

Research Challenges in Trustworthy Artificial Intelligence and Computing for Health: The Case of the PRE-ACT project 可信赖人工智能和健康计算的研究挑战:以PRE-ACT项目为例

公共管理高层论坛 Pub Date : 2023-06-06 DOI: 10.1109/EuCNC/6GSummit58263.2023.10188239

Foivos Charalampakos, Thomas Tsouparopoulos, Yiannis Papageorgiou, G. Bologna, A. Panisson, A. Perotti, I. Koutsopoulos

{"title":"Research Challenges in Trustworthy Artificial Intelligence and Computing for Health: The Case of the PRE-ACT project","authors":"Foivos Charalampakos, Thomas Tsouparopoulos, Yiannis Papageorgiou, G. Bologna, A. Panisson, A. Perotti, I. Koutsopoulos","doi":"10.1109/EuCNC/6GSummit58263.2023.10188239","DOIUrl":"https://doi.org/10.1109/EuCNC/6GSummit58263.2023.10188239","url":null,"abstract":"The PRE-ACT project is a newly launched Horizon Europe project that aims to use Artificial Intelligence (AI) towards predicting the risk of side effects of radiotherapy treatment for breast cancer patients. In this paper, we outline four main threads pertaining to AI and computing that are part of the project's research agenda, namely: (i) Explainable AI techniques to make the risk prediction interpretable for the patient and the clinician; (ii) Fair AI techniques to identify and explain potential biases in clinical decision support systems; (iii) Training of AI models from distributed data through Federated Learning algorithms to ensure data privacy; (iv) Mobile applications to provide the patients and clinicians with an interface for the side effect risk prediction. For each of these directions, we provide an overview of the state-of-the-art, with emphasis on techniques that are more relevant for the project. Collectively, these four threads can be seen as enforcing Trustworthy AI and pave the way to transparent and responsible AI systems that are adopted by end-users and may thus unleash the full potential of AI.","PeriodicalId":65870,"journal":{"name":"公共管理高层论坛","volume":"28 1","pages":"629-634"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72682048","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}

引用次数: 0