IEEE Transactions on Network and Service Management最新文献_第10页

Energy Efficient UAV-Assisted IoT Data Collection: A Graph-Based Deep Reinforcement Learning Approach 高能效无人机辅助物联网数据采集：基于图的深度强化学习方法

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-28 DOI: 10.1109/TNSM.2024.3450964

Qianqian Wu;Qiang Liu;Wenliang Zhu;Zefan Wu

{"title":"Energy Efficient UAV-Assisted IoT Data Collection: A Graph-Based Deep Reinforcement Learning Approach","authors":"Qianqian Wu;Qiang Liu;Wenliang Zhu;Zefan Wu","doi":"10.1109/TNSM.2024.3450964","DOIUrl":"10.1109/TNSM.2024.3450964","url":null,"abstract":"With the advancements in technologies such as 5G, Unmanned Aerial Vehicles (UAVs) have exhibited their potential in various application scenarios, including wireless coverage, search operations, and disaster response. In this paper, we consider the utilization of a group of UAVs as aerial base stations (BS) to collect data from IoT sensor devices. The objective is to maximize the volume of collected data while simultaneously enhancing the geographical fairness among these points of interest, all within the constraints of limited energy resources. Therefore, we propose a deep reinforcement learning (DRL) method based on Graph Attention Networks (GAT), referred to as “GADRL”. GADRL utilizes graph convolutional neural networks to extract spatial correlations among multiple UAVs and makes decisions in a distributed manner under the guidance of DRL. Furthermore, we employ Long Short-Term Memory to establish memory units for storing and utilizing historical information. Numerical results demonstrate that GADRL consistently outperforms four baseline methods, validating its computational efficiency.","PeriodicalId":13423,"journal":{"name":"IEEE Transactions on Network and Service Management","volume":"21 6","pages":"6082-6094"},"PeriodicalIF":4.7,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Distributed Learning Framework for eMBB-URLLC Multiplexing in Open Radio Access Networks 开放无线接入网络中 eMBB-URLLC 复用的分布式学习框架

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-28 DOI: 10.1109/TNSM.2024.3451295

Madyan Alsenwi;Eva Lagunas;Symeon Chatzinotas

{"title":"Distributed Learning Framework for eMBB-URLLC Multiplexing in Open Radio Access Networks","authors":"Madyan Alsenwi;Eva Lagunas;Symeon Chatzinotas","doi":"10.1109/TNSM.2024.3451295","DOIUrl":"10.1109/TNSM.2024.3451295","url":null,"abstract":"Next-generation (NextG) cellular networks are expected to evolve towards virtualization and openness, incorporating reprogrammable components that facilitate intelligence and real-time analytics. This paper builds on these innovations to address the network slicing problem in multi-cell open radio access wireless networks, focusing on two key services: enhanced Mobile BroadBand (eMBB) and Ultra-Reliable Low Latency Communications (URLLC). A stochastic resource allocation problem is formulated with the goal of balancing the average eMBB data rate and its variance, while ensuring URLLC constraints. A distributed learning framework based on the Deep Reinforcement Learning (DRL) technique is developed following the Open Radio Access Networks (O-RAN) architectures to solve the formulated optimization problem. The proposed learning approach enables training a global machine learning model at a central cloud server and sharing it with edge servers for executions. Specifically, deep learning agents are distributed at network edge servers and embedded within the Near-Real-Time Radio access network Intelligent Controller (Near-RT RIC) to collect network information and perform online executions. A global deep learning model is trained by a central training engine embedded within the Non-Real-Time RIC (Non-RT RIC) at the central server using received data from edge servers. The performed simulation results validate the efficacy of the proposed algorithm in achieving URLLC constraints while maintaining the eMBB Quality of Service (QoS).","PeriodicalId":13423,"journal":{"name":"IEEE Transactions on Network and Service Management","volume":"21 5","pages":"5718-5732"},"PeriodicalIF":4.7,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Dynamic Flow Scheduling for DNN Training Workloads in Data Centers 数据中心 DNN 训练工作负载的动态流量调度

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-27 DOI: 10.1109/TNSM.2024.3450670

Xiaoyang Zhao;Chuan Wu;Xia Zhu

{"title":"Dynamic Flow Scheduling for DNN Training Workloads in Data Centers","authors":"Xiaoyang Zhao;Chuan Wu;Xia Zhu","doi":"10.1109/TNSM.2024.3450670","DOIUrl":"10.1109/TNSM.2024.3450670","url":null,"abstract":"Distributed deep learning (DL) training constitutes a significant portion of workloads in modern data centers that are equipped with high computational capacities, such as GPU servers. However, frequent tensor exchanges among workers during distributed deep neural network (DNN) training can result in heavy traffic in the data center network, leading to congestion at server NICs and in the switching network. Unfortunately, none of the existing DL communication libraries support active flow control to optimize tensor transmission performance, instead relying on passive adjustments to the congestion window or sending rate based on packet loss or delay. To address this issue, we propose a flow scheduler per host that dynamically tunes the sending rates of outgoing tensor flows from each server, maximizing network bandwidth utilization and expediting job training progress. Our scheduler comprises two main components: a monitoring module that interacts with state-of-the-art communication libraries supporting parameter server and all-reduce paradigms to track the training progress of DNN jobs, and a congestion control protocol that receives in-network feedback from traversing switches and computes optimized flow sending rates. For data centers where switches are not programmable, we provide a software solution that emulates switch behavior and interacts with the scheduler on servers. Experiments with real-world GPU testbed and trace-driven simulation demonstrate that our scheduler outperforms common rate control protocols and representative learning-based schemes in various settings.","PeriodicalId":13423,"journal":{"name":"IEEE Transactions on Network and Service Management","volume":"21 6","pages":"6643-6657"},"PeriodicalIF":4.7,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

SAR: Receiver-Driven Transport Protocol With Micro-Burst Prediction in Data Center Networks SAR：数据中心网络中具有微脉冲预测功能的接收器驱动传输协议

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-27 DOI: 10.1109/TNSM.2024.3450597

Jin Ye;Tiantian Yu;Zhaoyi Li;Jiawei Huang

{"title":"SAR: Receiver-Driven Transport Protocol With Micro-Burst Prediction in Data Center Networks","authors":"Jin Ye;Tiantian Yu;Zhaoyi Li;Jiawei Huang","doi":"10.1109/TNSM.2024.3450597","DOIUrl":"10.1109/TNSM.2024.3450597","url":null,"abstract":"In recent years, motivated by new datacenter applications and the well-known shortcomings of TCP in data center, many receiver-driven transport protocols have been proposed to provide ultra-low latency and zero packet loss by using the proactive congestion control. However, in the scenario of mixed short and long flows, the short flows with ON/OFF pattern generate micro-burst traffic, which significantly deteriorates the performance of existing receiver-driven transport protocols. Firstly, when the short flows turn into ON mode, the long flows cannot immediately concede bandwidth to the short ones, resulting in queue buildup and even packet loss. Secondly, when the short flows change from ON to OFF mode, the released bandwidth cannot be fully utilized by the long flows, leading to serious bandwidth waste. To address these issues, we propose a new receiver-driven transport protocol, called SAR, which predicts the micro burst generated by short flows and adjusts the sending rate of long flows accordingly. With the aid of micro-burst prediction mechanism, SAR mitigates the bandwidth competition due to the arrival of short flows, and alleviates the bandwidth waste when the short flows leave. The testbed and NS2 simulation experiments demonstrate that SAR reduces the average flow completion time (AFCT) by up to 66% compared to typical receiver-driven transport protocols.","PeriodicalId":13423,"journal":{"name":"IEEE Transactions on Network and Service Management","volume":"21 6","pages":"6409-6422"},"PeriodicalIF":4.7,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Lightweight Automatic ECN Tuning Based on Deep Reinforcement Learning With Ultra-Low Overhead in Datacenter Networks 数据中心网络中基于深度强化学习的超低开销轻量级自动 ECN 调整

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-27 DOI: 10.1109/TNSM.2024.3450596

Jinbin Hu;Zikai Zhou;Jin Zhang

引用次数: 0

CACC: A Congestion-Aware Control Mechanism to Reduce INT Overhead and PFC Pause Delay CACC：减少 INT 开销和 PFC 暂停延迟的拥塞感知控制机制

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-26 DOI: 10.1109/TNSM.2024.3449699

Xiwen Jie;Jiangping Han;Guanglei Chen;Hang Wang;Peilin Hong;Kaiping Xue

{"title":"CACC: A Congestion-Aware Control Mechanism to Reduce INT Overhead and PFC Pause Delay","authors":"Xiwen Jie;Jiangping Han;Guanglei Chen;Hang Wang;Peilin Hong;Kaiping Xue","doi":"10.1109/TNSM.2024.3449699","DOIUrl":"10.1109/TNSM.2024.3449699","url":null,"abstract":"Nowadays, Remote Direct Memory Access (RDMA) is gaining popularity in data centers for low CPU overhead, high throughput, and ultra-low latency. As one of the state-of-the-art RDMA Congestion Control (CC) mechanisms, HPCC leverages the In-band Network Telemetry (INT) features to achieve accurate control and significantly shortens the Flow Completion Time (FCT) for short flows. However, there exists redundant INT information increasing the processing latency at switches and affecting flows’ throughput. Besides, its end-to-end feedback mechanism is not timely enough to help senders cope well with bursty traffic, and there still exists a high probability of triggering Priority-based Flow Control (PFC) pauses under large-scale incast. In this paper, we propose a Congestion-Aware (CA) control mechanism called CACC, which attempts to push CC to the theoretical low INT overhead and PFC pause delay. CACC introduces two CA algorithms to quantize switch buffer and egress port congestion, separately, along with a fine-grained window size adjustment algorithm at the sender. Specifically, the buffer CA algorithm perceives large-scale congestion that may trigger PFC pauses and provides early feedback, significantly reducing the PFC pause delay. The egress port CA algorithm perceives the link state and selectively inserts useful INT data, achieving lower queue sizes and reducing the average overhead per packet from 42 bytes to 2 bits. In our evaluation, compared with HPCC, PINT, and Bolt, CACC shortens the average and tail FCT by up to 27% and 60.1%, respectively.","PeriodicalId":13423,"journal":{"name":"IEEE Transactions on Network and Service Management","volume":"21 6","pages":"6382-6397"},"PeriodicalIF":4.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

CoSIS: A Secure, Scalability, Decentralized Blockchain via Complexity Theory CoSIS：通过复杂性理论实现安全、可扩展性、去中心化的区块链

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-26 DOI: 10.1109/TNSM.2024.3449575

Hui Wang;Zhenyu Yang;Ming Li;Xiaowei Zhang;Yanlan Hu;Donghui Hu

{"title":"CoSIS: A Secure, Scalability, Decentralized Blockchain via Complexity Theory","authors":"Hui Wang;Zhenyu Yang;Ming Li;Xiaowei Zhang;Yanlan Hu;Donghui Hu","doi":"10.1109/TNSM.2024.3449575","DOIUrl":"10.1109/TNSM.2024.3449575","url":null,"abstract":"As the origin of blockchains, the Nakamoto Consensus protocol is the primary protocol for many public blockchains (e.g., Bitcoin) used in cryptocurrencies. Blockchains need to be decentralized as a core feature, yet it is difficult to strike a balance between scalability and security. Many approaches to improving blockchain scalability often result in diminished security or compromise the decentralized nature of the system. Inspired by network science, especially the epidemic model, we try to solve this problem by mapping the propagation of transactions and blocks as two interacting epidemics, called the CoSIS model. We extend the transaction propagation process to increase the efficiency of block propagation, which reduces the number of unknown transactions. The reduction of the block propagation latency ultimately increases the blockchain throughput. The theory of complex networks is employed to offer an optimal boundary condition. Finally, the node scores are stored in the chain, so that it also provides a new incentive approach. Our experiments show that CoSIS accelerates blocks’ propagation and TPS is raised by 20% \u0000<inline-formula> <tex-math>$sim ~33$ </tex-math></inline-formula>\u0000% on average. At the same time, the system security can be significantly improved, as an orphaned block rate is close to zero in better cases. CoSIS enhances the scalability and security of the blockchain while ensuring that all changes do not compromise the decentralized nature of the blockchain.","PeriodicalId":13423,"journal":{"name":"IEEE Transactions on Network and Service Management","volume":"21 6","pages":"6204-6217"},"PeriodicalIF":4.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Mitigating Label Flipping Attacks in Malicious URL Detectors Using Ensemble Trees 利用集合树缓解恶意 URL 检测器中的标签翻转攻击

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-26 DOI: 10.1109/TNSM.2024.3447411

Ehsan Nowroozi;Nada Jadalla;Samaneh Ghelichkhani;Alireza Jolfaei

{"title":"Mitigating Label Flipping Attacks in Malicious URL Detectors Using Ensemble Trees","authors":"Ehsan Nowroozi;Nada Jadalla;Samaneh Ghelichkhani;Alireza Jolfaei","doi":"10.1109/TNSM.2024.3447411","DOIUrl":"10.1109/TNSM.2024.3447411","url":null,"abstract":"Malicious URLs present significant threats to businesses, such as transportation and banking, causing disruptions in business operations. It is essential to identify these URLs; however, existing Machine Learning models are vulnerable to backdoor attacks. These attacks involve manipulating a small portion of the training data labels, such as Label Flipping, which can lead to misclassification. Therefore, it is crucial to incorporate defense mechanisms into machine-learning models to protect against such attacks. The focus of this study is on backdoor attacks in the context of URL detection using ensemble trees. By illuminating the motivations behind such attacks, highlighting the roles of attackers, and emphasizing the critical importance of effective defense strategies, this paper contributes to the ongoing efforts to fortify machine-learning models against adversarial threats within the machine-learning domain in network security. We propose an innovative alarm system that detects the presence of poisoned labels and a defense mechanism designed to uncover the original class labels with the aim of mitigating backdoor attacks on ensemble tree classifiers. We conducted a case study using the Alexa and Phishing Site URL datasets and showed that label-flipping attacks can be addressed using our proposed defense mechanism. Our experimental results prove that the Label Flipping attack achieved an Attack Success Rate between 50-65% within 2-5%, and the innovative defense method successfully detected poisoned labels with an accuracy of up to 100%.","PeriodicalId":13423,"journal":{"name":"IEEE Transactions on Network and Service Management","volume":"21 6","pages":"6875-6884"},"PeriodicalIF":4.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

FReD-ViQ: Fuzzy Reinforcement Learning Driven Adaptive Streaming Solution for Improved Video Quality of Experience FReD-ViQ：模糊强化学习驱动的自适应流媒体解决方案，改善视频体验质量

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-26 DOI: 10.1109/TNSM.2024.3450014

Abid Yaqoob;Gabriel-Miro Muntean

{"title":"FReD-ViQ: Fuzzy Reinforcement Learning Driven Adaptive Streaming Solution for Improved Video Quality of Experience","authors":"Abid Yaqoob;Gabriel-Miro Muntean","doi":"10.1109/TNSM.2024.3450014","DOIUrl":"10.1109/TNSM.2024.3450014","url":null,"abstract":"Next-generation cellular networks strive to offer ubiquitous connectivity, enhanced transmission rates with increased capacity, and superior network coverage. However, they face significant challenges due to the growing demand for multimedia services across diverse devices. Adaptive multimedia streaming services are essential for achieving good viewer Quality of Experience (QoE) levels amidst these challenges. Yet, the existing adaptive video streaming solutions do not consider diverse QoE preferences or are limited to meeting specific QoE objectives. This paper presents FReD-ViQ, a Fuzzy Reinforcement Learning-Driven Adaptive Streaming Solution for Improved Video QoE that combines the strengths of fuzzy logic and advanced Deep Reinforcement Learning (DRL) mechanisms to deliver exceptional, individually tailored user experiences. FReD-ViQ is a sophisticated streaming solution that leverages efficient membership function modelling to achieve a more finely-grained representation of both input and output spaces. This advanced representation is augmented by a set of fuzzy rules that govern the decision-making process. In addition to its fuzzy logic capabilities, FReD-ViQ incorporates a novel DRL algorithm based on Dueling Double Deep Q-Network (Dueling DDQN), noisy networks, and prioritized experience replay (PER) techniques. This innovative fusion enables effective modelling of uncertain network dynamics and high-dimensional state spaces while optimizing exploration-exploitation trade-offs in adaptive streaming environments. Extensive performance evaluations in real-world simulation settings demonstrate that FReD-ViQ effectively surpasses existing solutions across multiple QoE models, yielding average improvements of 23.10% (Linear QoE), 23.97% (Log QoE), and 33.42% (HD QoE).","PeriodicalId":13423,"journal":{"name":"IEEE Transactions on Network and Service Management","volume":"21 5","pages":"5532-5547"},"PeriodicalIF":4.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10648983","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

FAPM: A Fake Amplification Phenomenon Monitor to Filter DRDoS Attacks With P4 Data Plane FAPM：利用 P4 数据平面过滤 DRDoS 攻击的假放大现象监控器

IF 4.7 2区计算机科学

IEEE Transactions on Network and Service Management Pub Date : 2024-08-26 DOI: 10.1109/TNSM.2024.3449889

Dan Tang;Xiaocai Wang;Keqin Li;Chao Yin;Wei Liang;Jiliang Zhang

{"title":"FAPM: A Fake Amplification Phenomenon Monitor to Filter DRDoS Attacks With P4 Data Plane","authors":"Dan Tang;Xiaocai Wang;Keqin Li;Chao Yin;Wei Liang;Jiliang Zhang","doi":"10.1109/TNSM.2024.3449889","DOIUrl":"10.1109/TNSM.2024.3449889","url":null,"abstract":"Distributed Reflection Denial-of-Service (DRDoS) attacks have caused significant destructive effects by virtue of emerging protocol vulnerabilities and amplification advantages, and their intensity is increasing. The emergence of programmable data plane supporting line-rate forwarding provides a new opportunity for fine-grained and efficient attack detection. This paper proposed a light-weight DRDoS attack detection and mitigation system called FAPM, which is deployed at the victim end with the intention of detecting the amplification behavior caused by the attack. It places the work of collecting and calculating reflection features on the data plane operated by “latter window assisting former window” mechanism, and arranges complex identification and regulation logic on the control plane. This approach avoids the hardware constraints of the programmable switch while leveraging their per-packet processing capability. Also, it reduces communication traffic significantly through feature compression and state transitions. Experiments show that FAPM has (1) fast response capability within seconds (2) a memory footprint at the KB level and communication overhead of 1 Kbps, and (3) good robustness.","PeriodicalId":13423,"journal":{"name":"IEEE Transactions on Network and Service Management","volume":"21 6","pages":"6703-6715"},"PeriodicalIF":4.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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