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检索条件"机构=Shenzhen Key Lab of Cloud Computing Technology and Application"

共 81 条记录，以下是41-50 订阅

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A Dynamic Self-adapting Algorithm of Redundancy Parameter in TCP-NC

A Dynamic Self-adapting Algorithm of Redundancy Parameter in...

引用

2012 IEEE 14th International Conference on Communication technology

作者： Xudong Fan Hui Li Kai Pan Shenzhen Key Lab for Cloud Computing Technology and Application PKU

ISBN: (纸本)9781467321006

We propose a method of dynamically adjusting redundancy parameter,which can be applied in "Network Coding Meets TCP".It can help solve the packet losses in the TCP layer and be part of the new protocol in the future *** our scheme,we mainly introduce "time-cache" and "time-classification management algorithm" to the network coding layer of the *** analyzing the time difference between the acknowledgements given by the sink,we can give the right value of redundancy parameter using time-classification management algorithm,for choosing a right value of redundancy parameter is very important to mask losses from ***,we give the theoretical analyses of the algorithm and get the optimal solution of redundancy *** a result,network coding can perfectly meet TCP in the lossy links.

关键词： network coding TCP redundancy parameter lossy links

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A dynamic cache partitioning mechanism under virtualization environment

A dynamic cache partitioning mechanism under virtualization ...

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11th IEEE International Conference on Trust, Security and Privacy in computing and Communications, TrustCom-2012

作者： Wang, Xiaolin Wen, Xiang Li, Yechen Luo, Yingwei Li, Xiaoming Wang, Zhenlin Dept. of Computer Science and Technology Peking University Beijing 100871 China Shenzhen Key Lab. for Cloud Computing Technology and Applications Peking University Shenzhen Graduate School Guangdong 518055 China Dept. of Computer Science Michigan Technological University Houghton MI 49931 United States

ISBN: (纸本)9780769547459

Cache sharing among multiple computing units on chip is common in today's multi-core processors, and a lot of research has focused on the effective management of shared cache. A software management method called page coloring is commonly used to divide the cache among different applications competing for the same cache entries. Both static and dynamic cache partition mechanism have been implemented in operating system or user-space level. However, few efforts have been made under virtualization environments. Our previous work has provided a static cache partition method based on page coloring in Xen, following that, a dynamic cache partition mechanism called Colored Page Migration (CoPaM) is presented in this paper. © 2012 IEEE.

关键词： Virtualization

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A General Co/Decoder of Network Coding in HDL

A General Co/Decoder of Network Coding in HDL

引用

Workshop on Network Coding, Theory and applications (NetCod)

作者： Minglong Zhang Hui Li Fuxing Chen Hanxu Hou Huiyao An Wei Wang Jiaqing Huang Shenzhen Key Laboratory of Cloud Computing Technology & Application Shenzhen Graduate School Peking University China Department of Electronic and Information Engineering Huazhong University of Science and Technology Wuhan China

This paper presents a practical and general coder and decoder of network coding (NC) with HDL (Hardware Description Language) logic for wire-speed nodes in multisource multicast networks. The NC coders apply random linear network coding (RLNC) and the decoders recover the original packets by Cramer's rule. All these mathematical operations are carried out in the Galois Field (256). The structures and algorithms of NC coder and decoder were designed in detail and implemented in HDL with NetFPGA boards provided by Stanford University. Comparing with traditional stored-and-forward mechanism, network emulations showed that networks with wire-speed NC coder and decoder nodes could achieve the capacity bound of max-flow min-cut theorem in case of bottlenecks, and the end-to-end delay was guaranteed on a small constant.

关键词： Decoding Encoding Network coding IP networks Delay Hardware Receivers

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A Trust-Based Recommendation Model Constructed from Improved Page Rank Algorithm in a P2P Social Network

A Trust-Based Recommendation Model Constructed from Improved...

引用

2014 International Conference on Computer,Network Security and Communication Engineering(CNSCE 2014)

作者： Kai LEI Da-zhou QIN Kun ZHANG Shenzhen Key Lab for Cloud Computing Technology & Applications (SPCCTA) School of Electronics and Computer Engineering Peking University

With the rise of social networking in the web2.0 era, the Internet gradually evolves to be community-based [1]. The process of obtaining information via the Internet reflects certain social characteristics. In order to adapt recommendation technology to such changes, a trust-based recommendation algorithm is approached in this paper. The research is conducted in a practical application environment, a P2 P file-sharing system named Maze [2]. The algorithm is designed as follows: 1) digging download logs and friendship logs, 2) establishing trust-net social model. The empirical results show that the algorithm has improved recommendation quality significantly compared with the original content-based recommendation algorithm used in Maze.

关键词： Information filtering Personalization User behavior Trust mechanism Recommendation system

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MDPF: An NDN Probabilistic Forwarding Strategy based on Maximizing Deviation Method

MDPF: An NDN Probabilistic Forwarding Strategy based on Maxi...

引用

IEEE Global Communications Conference

作者： Kai Lei Jie Yuan Jiawei Wang Shenzhen Key Lab for Cloud Computing Technology and Applications (SPCCTA) School of Electronics and Computer Engineering Peking University

ISBN: (纸本)9781479959532

Forwarding strategy is the key feature of Named Data Networking (NDN) to realize dynamic, adaptive and intelligent forwarding, but work in this area is still at a very preliminary stage. In this paper, selecting which forwarding interface among multiple alternatives in NDN is defined as a multiple attribute decision making (MADM) problem and a maximizing deviation based probabilistic forwarding (MDPF) strategy is proposed to select forwarding interface on probability. Since multiple network metrics such as interface status, pending Interest numbers are considered together, each alternative interface's availability is obtained more accurately. Thus, better content delivery efficiency can be achieved. In addition, MDPF provides good extensibility, as any appropriate metric can be added to enhance or customize it. We implement the proposal in ndnSIM and compare it with BestRoute and PI-based strategies under various topologies and scenarios. Experimental results show that MDPF strategy is more responsive and sensitive to network changes, and can realize higher throughput, lower drop rate as well as better load balance.

关键词： NDN gene Work area delivery efficiency

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A Practical Approach for Automatically Constructing Concept Map in E-learning Environments

A Practical Approach for Automatically Constructing Concept ...

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2014 IEEE International Conference on Progress in Informatics and computing

作者： Na Yi Hui Li Shenzhen Eng. Lab. of Converged Networks Technology Shenzhen Key Lab. of Cloud Computing Tech. and App Peking University Shenzhen Graduate School

With the prevalence of web-based learning, the application of concept mapping, as a powerful diagnostic and instructional tool, has been widely exploited in both education and computer science. In recent years, several methods have been presented toautomatically construct concept map that achieved encouraging results, while ignoring some critical issues when applied in actual E-learning system. In this paper,we propose a practical approach for constructing concept map,which is adapted tothe dynamic character of a real ***, we apply fuzzy set theory and fuzzy reasoning basis on fuzzy rules for similarity degree between twoconcepts, tofind direct prerequisite relationship among concepts. It provides a useful way toimprove accuracy and reduce complexity of the concept map.

关键词： concept map E-learning fuzzy set education

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IFS-RL: An intelligent forwarding strategy based on reinforcement learning in named-data networking

IFS-RL: An intelligent forwarding strategy based on reinforc...

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2018 ACM SIGCOMM Workshop on Network Meets AI and ML, NetAI 2018

作者： Zhang, Yi Xu, Kuai Bai, Bo Lei, Kai Shenzhen Key Lab for Cloud Computing Technology and Applications School of Electronic and Computer Engineering Peking University Shenzhen China School of Mathematical and Natural Sciences Arizona State University Arizona United States Future Network Theory Lab 2012 Labs Huawei Technologies Co. Ltd. Shatin N.T. Hong Kong

ISBN: (纸本)9781450359115

Named-Data Networking (NDN) is a new communication paradigm where network primitives are based on named-data rather than host identifiers. Compared with IP, NDN has a unique feature that forwarding plane enables each router to select the next forwarding hop independently without relying on routing. Therefore, forwarding strategies play a significant role for adaptive and efficient data transmission in NDN. Most of the existing forwarding strategies use fixed control rules based on simplified or inaccurate models of the deployment environment. As a result, existing schemes inevitably fail to achieve optimal performance across a broad set of network conditions and application demands. In this paper, We propose IFS-RL, an intelligent forwarding strategy based on reinforcement learning. IFS-RL trains a neural network model which chooses appropriate interfaces for the forwarding of Interest based on observations collected by routing node. Not relying on pre-programmed models, IFS-RL learns to make decisions solely through observations of the resulting performance of past decisions. Therefore, IFS-RL can implement intelligent forwrarding which adapt to a wide range of network conditions. Besides, we also researches the learning granularity and the enhancement for network topology change. We compare IFS-RL to state-of-the-art forwarding strategies in ndnSIM. Experimental results show that IFS-RL can achieve higher throughput and lower packet drop rates. © 2018 Association for computing Machinery.

关键词： Network topology

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A Secure Synchronized Reading System over Time-Critical Online Contests

A Secure Synchronized Reading System over Time-Critical Onli...

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IEEE International Conference on Communications

作者： Wei Wang Peng Xu Hui Li Laurence Tianruo Yang Key Lab of Cloud Computing Technology Peking University Shenzhen China Services Computing Technology and System Lab Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan China Embedded and Pervasive Computing Lab Huazhong University of Science and Technology Wuhan China

The time-critical online contest environment calls for an elegant and precise management system to start a contest online. The management system should simultaneously follow three rules of security that are confidentiality, anonymity and fairness. We present in this paper a novel system named Secure Synchronized Reading (SSR) system as well as its corresponding security model according to the three rules. SSR can evoke a synchronized start for all competitors in a contest at the intended time by employing a Randomness-reused Identity-Based Encryption (RIBE) scheme. It can avoid huge differences among delivery delays of heterogeneous competitors and any false start by an adverse competitor. Consequently when an online contest begins, the SSR system performs quasi real-time with ignorable communication delays in the security model. As a complement, the analysis on the provable security of SSR is given finally, as well as a further analysis on the achievement of synchronization.

关键词： Synchronization Encryption Delays Real-time systems Identity-based encryption

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Threshold-Based Secure and Privacy-Preserving Message Verification in VANETs

Threshold-Based Secure and Privacy-Preserving Message Verifi...

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IEEE International Conference on Trust, Security and Privacy in computing and Communications (TrustCom)

作者： Wei Gao Mingzhong Wang Liehuang Zhu Xiaoping Zhang Language Information Processing and Cloud Computing Application Beijing Institute of Technology National Key Lab of Vehicular Transmission China North Vehicle Research Institute

ISBN: (纸本)9781479965144

Messages spreading inside vehicular ad hoc networks (VANETs) generally need to achieve the property of verifiability and content integrity, while preserving user privacy. Otherwise, VANETs will either fall into chaos, or prevent users from embracing it. To achieve this goal, we propose a protocol, which contains a priori and posteriori countermeasures, to guarantee these features. The a priori process firstly verifies that each message is sent by a vehicle only once. Then it collects and checks whether the count of the message exceeds the threshold value to improve the trustworthiness of the message. The posteriori process verifies the integrity of the message, ensuring it is unchanged during transmission between the vehicle and the road side unit. The privacy is preserved by applying group signature. In case of disruptive events, the proposed solution can trace back to the source vehicle which generates the message.

关键词： Vehicles Privacy Authentication Protocols Public key Servers

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Coding-Driven Scheduling for Frame-based Multicast Switches

Coding-Driven Scheduling for Frame-based Multicast Switches

引用

2011 International Symposium on Network Coding(2011网络编码国际会议 NETCOD 2011)

作者： Li Yu Wei Wang Guangxi Zhu Hui Li Dept.of Electronic and Information Engineering Huazhong University of science and Technology Key Lab of Cloud Computing Technology Shenzhen Graduate school Peking University

The method of network coding has been proven a promising solution to fanin conflict problems (traffic flows conflicting at input ports) in multicast switches in previous work. However, this approach is inefficient when applied to frame-based switches because of over-splitting with conventional algorithms. These algorithms do not support the benefits of network coding to be fully realized when ignoring the impact of fanout splitting. In this paper, we employ a self-defined weight for the Maximum Weight Matching (MWM) scheme for multicast switches. The corresponding scheduling algorithm avoids over-splitting to any traffic flow. The so-called Coding-Driven scheduling algorithm can remarkably decrease the minimum time slots required for scheduling, therefore improve the efficiency of network coding method in multicast switches as showed in the empirical results.

关键词： Network coding Optimal scheduling Scheduling Scheduling algorithm Throughput Approximation algorithms Switches

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