IEEE Journal on Selected Areas in Communications最新文献

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Dynamic Traffic Management for SD-WAN Inter-Cloud Communication SD-WAN云间通信的动态流量管理
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/JSAC.2020.2986957
Z. Duliński, R. Stankiewicz, Grzegorz Rzym, Piotr Wydrych
{"title":"Dynamic Traffic Management for SD-WAN Inter-Cloud Communication","authors":"Z. Duliński, R. Stankiewicz, Grzegorz Rzym, Piotr Wydrych","doi":"10.1109/JSAC.2020.2986957","DOIUrl":"https://doi.org/10.1109/JSAC.2020.2986957","url":null,"abstract":"This article introduces the concept, implementation and evaluation of Dynamic Traffic Management (DTM). This management mechanism minimizes traffic transfer costs on inter-domain links. It works for volume and $95^{th}$ percentile tariffs. DTM reacts dynamically to traffic changes on inter-domain links shifting some part of traffic (manageable traffic) from one link to another. The management mechanism works in a distributed way. It requires cooperation between operators, namely Internet Service Providers (ISPs), receiving and generating traffic. Communication between ISPs is realized by SDN controllers (inter-domain SDN). DTM has been applied to inter-cloud communication for Data Centers (DCs) located in different ISP domains. Moreover, it is cloud-agnostic, i.e., DTM does not engage Cloud Service Providers (CSPs) into management procedures. Evaluation performed in the testbed shows that DTM is capable of decreasing ISP costs of transit traffic up to 29%.","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":"38 1","pages":"1335-1351"},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JSAC.2020.2986957","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42842918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
Atomic Predicates-Based Data Plane Properties Verification in Software Defined Networking Using Spark Spark在软件定义网络中基于原子谓词的数据平面属性验证
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/JSAC.2020.2986956
Yicong Zhang, Jie Li, S. Kimura, Wei Zhao, Sajal K. Das
{"title":"Atomic Predicates-Based Data Plane Properties Verification in Software Defined Networking Using Spark","authors":"Yicong Zhang, Jie Li, S. Kimura, Wei Zhao, Sajal K. Das","doi":"10.1109/JSAC.2020.2986956","DOIUrl":"https://doi.org/10.1109/JSAC.2020.2986956","url":null,"abstract":"Software-Defined Networking (SDN) is an innovational network architecture which gives network administrators the ability to directly control the whole network by programming on a centralized controller. Due to network complexity, networks are unlikely to be bug-free. The ability to verify data plane properties will make network management easier for network administrators in SDN. In this paper, we present a novel atomic predicates based data plane properties verification method for SDN using Spark which is a big data processing framework. First, we verify packet reachability which is a fundamental data plane property. Then, we verify other data plane properties such as loop-freedom and nonexistence of black holes. In addition, the proposed method can detect a security threat existing in SDN called firewall bypass threat with packet reachability verification. By adopting atomic predicates, we achieve less computational and storage overhead. We implement the methods and study the performance. The results of experiments show that we can efficiently and accurately detect loops, black holes and firewall bypass threats.","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":"38 1","pages":"1308-1321"},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JSAC.2020.2986956","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43421078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
P4Consist: Toward Consistent P4 SDNs P4组成:朝向一致的P4 sdn
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/JSAC.2020.2999653
Apoorv Shukla, Seifeddine Fathalli, T. Zinner, A. Hecker, S. Schmid
{"title":"P4Consist: Toward Consistent P4 SDNs","authors":"Apoorv Shukla, Seifeddine Fathalli, T. Zinner, A. Hecker, S. Schmid","doi":"10.1109/JSAC.2020.2999653","DOIUrl":"https://doi.org/10.1109/JSAC.2020.2999653","url":null,"abstract":"The prevailing wisdom is that a software-defined network (SDN) operates under the premise that the logically centralized control plane has an accurate representation of the actual data plane state. Unfortunately, bugs, misconfigurations, faults or attacks can introduce inconsistencies between the network control and the data plane that can undermine the correct operation at runtime. Through our experiments, we realize that P4 SDNs are no exception, and are prone to similar problems. With the aim to verify the control-data plane inconsistency, we present the design and implementation of P4Consist, a system to detect the inconsistency between control and data plane in P4 SDNs. P4Consist generates active probe-based traffic continuously or periodically as an input to the P4 SDNs to check whether the actual behavior on the data plane corresponds to the expected control plane behavior. In P4Consist, the control plane and the data plane generate independent reports which are later, compared to verify the control-data plane consistency. The previous works in the field of monitoring and verification mostly aim to test the P4 programs through static analysis and thus, are insufficient to verify the network consistency at runtime. Experiments with our prototype implementation of P4Consist are promising and show that P4Consist can verify the control-data plane consistency in the complex datacenter 4-ary fat-tree (20 switches) and multipath grid (4, 9 and 16 switches) topologies with 60k rules per switch within a minimum time of 4 minutes. At the same time, P4Consist scales to multiple source-destination pairs to detect control-data plane inconsistency.","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":"38 1","pages":"1293-1307"},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JSAC.2020.2999653","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44994499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Table of contents 目录表
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/jsac.2020.2999118
{"title":"Table of contents","authors":"","doi":"10.1109/jsac.2020.2999118","DOIUrl":"https://doi.org/10.1109/jsac.2020.2999118","url":null,"abstract":"","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":" ","pages":""},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/jsac.2020.2999118","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45218695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Uninterruptible IMS: Maintaining Users Access During Faults in Virtualized IP Multimedia Subsystem 不间断IMS:虚拟IP多媒体子系统故障时用户接入维护
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/JSAC.2020.2999686
M. T. Raza, Songwu Lu
{"title":"Uninterruptible IMS: Maintaining Users Access During Faults in Virtualized IP Multimedia Subsystem","authors":"M. T. Raza, Songwu Lu","doi":"10.1109/JSAC.2020.2999686","DOIUrl":"https://doi.org/10.1109/JSAC.2020.2999686","url":null,"abstract":"Network function virtualization (NFV) of IP Multimedia Subsystem (IMS) pose promise to service increasing multimedia traffic demand. In this paper, we show that virtualized IMS (vIMS) is unable to provide session-level resilience under faults and becomes the bottleneck to high service availability. We propose a design to provide fault-tolerance for vIMS operations. In control-plane, our system decomposes single IMS operation into different atomic actions, and partition these actions into critical and non-critical actions. Only the critical actions are then monitored in real time and the system can easily resume IMS operations after failure. In data-plane, we decompose multimedia traffic flows and partition each multimedia service as a separate Virtualized Network Function (VNF). Through data-plane partitioning, our design restricts the damage from faults to only failed VNF. Thereafter, impacted service flow is merged with other ongoing service flows. We build our system prototype of open source IMS over virtualized platform. Our results show that we can achieve session-level resilience by performing fail-over procedure within tens of milliseconds under different combinations of IMS failures in both control-plane and data-plane operations.","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":"38 1","pages":"1464-1477"},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JSAC.2020.2999686","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48962257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Edge Cloud-Enabled Radio Resource Management for Co-Operative Automated Driving 支持边缘云的无线电资源管理,用于协作式自动驾驶
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/JSAC.2020.2986870
Prajwal Keshavamurthy, E. Pateromichelakis, D. Dahlhaus, Chan Zhou
{"title":"Edge Cloud-Enabled Radio Resource Management for Co-Operative Automated Driving","authors":"Prajwal Keshavamurthy, E. Pateromichelakis, D. Dahlhaus, Chan Zhou","doi":"10.1109/JSAC.2020.2986870","DOIUrl":"https://doi.org/10.1109/JSAC.2020.2986870","url":null,"abstract":"Co-operative automated driving (CAD) is a key fifth generation mobile networks (5G) use case in which autonomous vehicles communicate over vehicle-to-vehicle (V2V) links requiring a wide range of rate-reliability-delay performance. One key 5G enabler for CAD sidelink radio resource management (RRM) in a multi-operator environment is the virtualization of RRM at the cloud server. This, however, is challenging due to an increase in control plane delay, signaling overhead and complexity. This paper introduces an edge cloud-enabled end-to-end vehicle-to-everything (V2X) architecture to support sidelink RRM in CAD scenarios. Analyzing the problem of a cloud-based sidelink resource allocation for CAD, a utility-based multi-objective optimization problem is described and is translated to three tasks: 1) a vehicle cluster formation as a solution to the clique partitioning problem ensuring vehicle reachability on the control plane, 2) an inter-cluster resource block pool (RB-pool) allocation as a solution to a max-min fairness problem and 3) an intra-cluster resource allocation. The proposed solution framework aims to achieve high modularity, low complexity and decouples cluster formation and RB-pool assignment from the intra-cluster optimum resource allocation, which may be performed on different time scales at different edge cloud entities. Simulation results in a realistic vehicular deployment show significant gains in terms of sidelink throughput and delay while maintaining high link quality.","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":"38 1","pages":"1515-1530"},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JSAC.2020.2986870","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44544585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Guest Editorial: Seventh Edition of the IEEE JSAC Series on Network Softwarization and Enablers 嘉宾评论:IEEE JSAC系列关于网络软件化和使能器的第七版
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/jsac.2020.2986960
T. Taleb
{"title":"Guest Editorial: Seventh Edition of the IEEE JSAC Series on Network Softwarization and Enablers","authors":"T. Taleb","doi":"10.1109/jsac.2020.2986960","DOIUrl":"https://doi.org/10.1109/jsac.2020.2986960","url":null,"abstract":"5G is raising high expectations, offering new avenues for research, and paving the way to a safer and highperforming set of innovative use-cases. For use-cases related for instance to Internet of Things (IoT), self-driving vehicles, or unmanned aerial vehicles (UAVs), the programming and management of the underlying network resources will be carried out in a dynamic and scalable manner. In this vein, many enabling technologies are adopted by service providers, cloud providers and enterprises, such as Software Defined Networking (SDN) and Network Function Virtualization (NFV).","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":"191 1","pages":"1281-1284"},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77757038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Timber: An SDN-Based Emulation Platform for Experimental Research on Video Streaming Timber:一个基于SDN的视频流实验研究仿真平台
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/JSAC.2020.2999683
Arslan Ahmad, Alessandro Floris, L. Atzori
{"title":"Timber: An SDN-Based Emulation Platform for Experimental Research on Video Streaming","authors":"Arslan Ahmad, Alessandro Floris, L. Atzori","doi":"10.1109/JSAC.2020.2999683","DOIUrl":"https://doi.org/10.1109/JSAC.2020.2999683","url":null,"abstract":"In this paper, we present an open source Software-Defined Networking (SDN) based emulation platform called Timber. We aim to provide the research community with an experimental tool for the design and evaluation of the new Quality of Experience (QoE) management and monitoring procedures for video streaming. To this aim, the main functionalities of Timber include: i) an SDN application for taking QoE-aware management decisions; ii) an SDN controller to monitor the network’s QoS (Quality of Service) and implement network management actions, such as network slicing and Multiprotocol Label Switching (MPLS) based prioritization operations; iii) a complete video streaming application including a multimedia server and a DASH-based client video player; iv) a user-end probe at the client video player to monitor QoE-related video application parameters, which are stored in a database that can be accessed by the SDN application; v) data analysis tools, which enable easy data visualization of measured QoS and QoE metrics as well as execution of statistical analysis of experimental results. In this article, we introduce and describe the main characteristics and functionalities of Timber as well as the implementation details. Finally, we provide experimental results of a video streaming scenario to demonstrate the capability of Timber to implement and test QoE-aware management approaches.","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":"38 1","pages":"1374-1387"},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JSAC.2020.2999683","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43478989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Tuple Space Assisted Packet Classification With High Performance on Both Search and Update 具有高搜索和更新性能的元组空间辅助分组分类
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/JSAC.2020.2986935
Wenjun Li, Tong Yang, Ori Rottenstreich, Xianfeng Li, Gaogang Xie, Hui Li, Balajee Vamanan, Dagang Li, Huiping Lin
{"title":"Tuple Space Assisted Packet Classification With High Performance on Both Search and Update","authors":"Wenjun Li, Tong Yang, Ori Rottenstreich, Xianfeng Li, Gaogang Xie, Hui Li, Balajee Vamanan, Dagang Li, Huiping Lin","doi":"10.1109/JSAC.2020.2986935","DOIUrl":"https://doi.org/10.1109/JSAC.2020.2986935","url":null,"abstract":"Software switches are being deployed in SDN to enable a wide spectrum of non-traditional applications. The popular Open vSwitch uses a variant of Tuple Space Search (TSS) for packet classifications. Although it has good performance on rule updates, it is less efficient than decision trees on lookups. In this paper, we propose a two-stage framework consisting of heterogeneous algorithms to adaptively exploit different characteristics of the rule sets at different scales. In the first stage, partial decision trees are constructed from several rule subsets grouped with respect to their small fields. This grouping eliminates rule replications at large scales, thereby enabling very efficient pre-cuttings. The second stage handles packet classification at small scales for non-leaf terminal nodes, where rule replications within each subspace may lead to inefficient cuttings. A salient fact is that small space means long address prefixes or less nesting levels of ranges, both indicating a very limited tuple space. To exploit this favorable property, we employ a TSS-based algorithm for these subsets following tree constructions. Experimental results show that our work has comparable update performance to TSS in Open vSwitch, while achieving almost an order-of-magnitude improvement on classification performance over TSS.","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":"38 1","pages":"1555-1569"},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JSAC.2020.2986935","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43607681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
5G Applications From Vision to Reality: Multi-Operator Orchestration 5G应用从视觉到现实:多运营商协同
IF 16.4 1区 计算机科学
IEEE Journal on Selected Areas in Communications Pub Date : 2020-07-01 DOI: 10.1109/JSAC.2020.2999684
B. Sonkoly, R. Szabó, Balázs Németh, János Czentye, Dávid Haja, Márk Szalay, János Dóka, B. P. Gero, Dávid Jocha, László Toka
{"title":"5G Applications From Vision to Reality: Multi-Operator Orchestration","authors":"B. Sonkoly, R. Szabó, Balázs Németh, János Czentye, Dávid Haja, Márk Szalay, János Dóka, B. P. Gero, Dávid Jocha, László Toka","doi":"10.1109/JSAC.2020.2999684","DOIUrl":"https://doi.org/10.1109/JSAC.2020.2999684","url":null,"abstract":"Envisioned 5G applications and services, such as Tactile Internet, Industry 4.0 use-cases, remote control of drone swarms, pose serious challenges to the underlying networks and cloud platforms. On the one hand, evolved cloud infrastructures provide the IT basis for future applications. On the other hand, networking is in the middle of a momentous revolution and important changes are mainly driven by Network Function Virtualization (NFV) and Software Defined Networking (SDN). A diverse set of cloud and network resources, controlled by different technologies and owned by cooperating or competing providers, should be coordinated and orchestrated in a novel way in order to enable future applications and fulfill application level requirements. In this paper, we propose a novel cross domain orchestration system which provides wholesale XaaS (Anything as a Service) services over multiple administrative and technology domains. Our goal is threefold. First, we design a novel orchestration system exploiting a powerful information model and propose a versatile embedding algorithm with advanced capabilities as a key enabler. The main features of the architecture include <inline-formula> <tex-math notation=\"LaTeX\">$i$ </tex-math></inline-formula>) efficient and multi-purpose service embedding algorithms which can be implemented based on graph models, <inline-formula> <tex-math notation=\"LaTeX\">$ii$ </tex-math></inline-formula>) inherent multi-domain support, <inline-formula> <tex-math notation=\"LaTeX\">$iii$ </tex-math></inline-formula>) programmable aggregation of different resources, <inline-formula> <tex-math notation=\"LaTeX\">$iv$ </tex-math></inline-formula>) information hiding together with flexible delegation of certain requirements enabling multi-operator use-cases, and <inline-formula> <tex-math notation=\"LaTeX\">$v$ </tex-math></inline-formula>) support for legacy technologies. Second, we present our proof-of-concept prototype implementing the proposed system. Third, we establish a dedicated test environment spanning across multiple European sites encompassing sandbox environments from both operators and the academia in order to evaluate the operation of the system. Dedicated experiments confirm the feasibility and good scalability of the whole framework.","PeriodicalId":13243,"journal":{"name":"IEEE Journal on Selected Areas in Communications","volume":"38 1","pages":"1401-1416"},"PeriodicalIF":16.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JSAC.2020.2999684","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49518946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
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