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Science China(Physics,Mechanics & Astronomy) 2014年第8期57卷 1413-1413页

作者： ZHANG Bo WU JunTing WANG BinQiang LI Hui National Digital Switching System Engineering Technological R&D Center Shenzhen Key Lab of Cloud Computing Technology and Application

The past decade has witnessed the birth of the golden age of precision cosmology. In particular, cosmic microwave back- ground （CMB） measurements have provided a powerful observational window to probe the earliest epochs of our Universe. Recently （March, 2014）, the Background Imaging of Cosmic Extragalactic Polarization （BICEP2） telescope at the South Pole announced the first detection of primordial B-mode polarization of the CMB that, if confirmed,

关键词：编辑宇宙微波背景宇宙学观察窗口河外星系 CMB 望远镜影像

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Design and implementation of Load-Balanced Multipath Self-routing switching system

Design and implementation of Load-Balanced Multipath Self-ro...

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International MultiConference of Engineers and Computer Scientists, IMECS 2014

作者： Zhan, Qian Li, Hui Chen, Fuxing Ma, Li Peking University Shenzhen Graduate School Shenzhen GuangDong518055 China Shenzhen Eng. Lab. of Converged Networks Technology Shenzhen Key Lab. of Cloud Computing Tech. and App. China

ISBN: (纸本)9789881925336

In order to ensure high quality of service (QoS) for Next Generation Network (NGN), we construct an innovative Load-Balanced Multipath Self-routing Switching Structure which consists of the same two multipath self-routing fabrics. The result of simulation is inspiring for achieving 100% throughput and no delay or jitter. For this reason, we start on the implementation on an Altera StratixIV FPGA. And the whole FPGA system is designed into two collaborative components: the UDP system and the register system. With two algorithms around input and output two stages, incoming traffic is transformed into uniformity and then to their final destinations. During the later period debugging, software simulation platform and automated test platform are built, which contribute to our work very much. At last, we carry out several experiments to test and verify our system. The report of the test result accords with what we expected.

关键词： Field programmable gate arrays (FPGA)

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A synchronous algorithm of network coding with hardware logic

A synchronous algorithm of network coding with hardware logi...

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Symposium on ICT and Energy Efficiency and Workshop on Information Theory and Security (CIICT 2012)

作者： Jiang Li Yining Li Hui Li Zhipu Zhu Huayu Zhang Fuxing Chen Shenzhen Key Lab of Cloud Computing Technology & Application Shenzhen Graduate School Peking University China 518055

This paper presents an efficient hardware prototype for network coding (NC). First, a packet synchronization mechanism is introduced to settle the problem of packet arriving mismatch between different incoming channels. Then a high-speed lookup-table-based circuit is designed to perform dot product over Galois Field, which forms the basic calculation unit of NC operation. Taking the speed advantage of FPGA hardware, this prototype is able to perform network coding operations within several hundred nanoseconds. Thus further studies and emulations on NC are able to be carried out upon this platform in the real network scenario.

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Coding-driven scheduling for frame-based multicast switches

Coding-driven scheduling for frame-based multicast switches

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IEEE International Symposium on Network Coding

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

ISBN: (纸本)9781612841403

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. © 2011 IEEE.

关键词： Network coding

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A smart low-consumption IoT framework for location tracking and its real application

A smart low-consumption IoT framework for location tracking ...

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International Conference on Electronics Information and Emergency Communication

作者： Hao Tang Jian Shi Kai Lei Shenzhen Key Lab for Cloud Computing Technology & Applications (SPCCTA) Graduate School Shenzhen Guangdong China

ISBN: (纸本)9781509019984

Location-based services are increasingly popular. Smart devices embedded with GPS receiver are widely used in vehicle tracking, law enforcement and person monitoring. To provide real-time data collecting and analyzing, a backend server is necessary. A mobile app can work as a user client for accessing location data and remote control. In this paper, we describe the design and implementation of a system providing real-time positioning and tracking service. Our system consists of three parts: tracking device, backend server and mobile app. Our tracking device integrates GPS module, GSM/GPRS module and TCP/IP stack, capable of generating location data, establishing TCP connection and receiving SMS. Location data are transmitted over TCP connection from device to our backend server. The server is responsible for collecting and storing data. The server also provides an HTTP-based RESTful API for mobile app and web service. A mobile app is built for displaying data and controlling device remotely. Data accessing is via calling REST API and remote control is sent to device by SMS. Our device is compact in volume, accurate in positioning, and long in battery life. Our device has been integrated in a walking stick as a real-world product.

关键词： Servers Mobile communication Global Positioning System Legged locomotion Computer architecture Real-time systems Ground penetrating radar

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A CUBIC-Based Explicit Congestion Control Mechanism in Named Data Networking

A CUBIC-Based Explicit Congestion Control Mechanism in Named...

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International Conference on Cyber-Enabled Distributed computing and Knowledge Discovery, CyberC

作者： Yongbin Liu Xuewei Piao Chaojun Hou Kai Lei Shenzhen Key Lab for Cloud Computing Technology & Applications Peking University SHENZHEN P.R.CHINA

ISBN: (纸本)9781509051557

As named data networking (NDN) continues to evolve into a mature and production network, a robust and efficient congestion control mechanism has become a fundamental requirement for the success and wide deployment of NDN. In this paper, upon exploring the unique hop-by-hop Interest forwarding feature, based on the CUBIC, we develop a novel congestion control mechanism for NDN. Our congestion control mechanism, namely EC-CUBIC, borrows the core idea of CUBIC to control the sending rate of interest packets on consumers. Specially, in routers, we queue the data packets in every face and according to the queue length to send a congestion signal to consumers, upon which consumers take action timely for the congestion. In addition, we implement this mechanism in ndnSIM, an NS3-based simulator, and conduct a number of experiments with various settings to evaluate the link utilization and packets-drop rate of the proposed algorithm. Comparing with the naive congestion control algorithm in NDN, our experimental results demonstrate that EC-CUBIC perform bette in terms of high link utilization and low packets-drop rate.

关键词： Algorithm design and analysis Face Downlink Bandwidth Topology Packet loss

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A NOVEL FRAMEWORK OF ONLINE NETWORK CODING FOR MULTICAST SWITCHES WITH CONSTRAINED BUFFERS

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Journal of Electronics(China) 2011年第4期28卷 460-467页

作者： Wang Wei Yu Li Zhu Guangxi Li Hui Wuhan National Laboratory for Optoelectronics Division of Communiction ＆ Intelligent NetworksDepartment of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan 430074 China Shenzhen Key Lab of Cloud Computing Technology ＆ Application Shenzhen Graduate School Peking University Shenzhen 518055 China

Network coding is able to address output conflicts when fanout splitting is allowed for multicast ***,it successfully achieves a larger rate region than non-coding approaches in crossbar ***,network coding requires large coding buffers and a high computational cost on encoding and *** this paper,we propose a novel Online Network Coding framework called Online NC for multicast switches,which is adaptive to constrained ***,it enjoys a much lower decoding complexity by a Vandermonde matrix based approach,as compared to conven-tional randomized network coding Our approach realizes online coding with one coding algo-rithm that synchronizes buffering and ***,we significantly reduce requirements on buffer space,while also sustaining high *** confirm the superior advantages of our contributions using empirical studies.

关键词： Packet switching Multicast Network coding Vandermonde matrix

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G-MAP: General Memory-Augmented Pre-trained Language Model for Domain Tasks

G-MAP: General Memory-Augmented Pre-trained Language Model f...

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2022 Conference on Empirical Methods in Natural Language Processing, EMNLP 2022

作者： Wan, Zhongwei Yin, Yichun Zhang, Wei Shi, Jiaxin Shang, Lifeng Chen, Guangyong Jiang, Xin Liu, Qun Guangdong Provincial Key Laboratory of Computer Vision and Virtual Reality Technology Shenzhen Institute of Advanced Technology Chinese Academy of Science China University of Chinese Academy of Sciences China Huawei Noah's Ark Lab Huawei Cloud Computing Zhejiang Lab China

Recently, domain-specific PLMs have been proposed to boost the task performance of specific domains (e.g., biomedical and computer science) by continuing to pre-train general PLMs with domain-specific corpora. However, this Domain-Adaptive Pre-Training (DAPT;Gururangan et al. (2020)) tends to forget the previous general knowledge acquired by general PLMs, which leads to a catastrophic forgetting phenomenon and sub-optimal performance. To alleviate this problem, we propose a new framework of General Memory-Augmented Pre-trained Language Model (G-MAP), which augments the domain-specific PLM by a memory representation built from the frozen general PLM without losing any general knowledge. Specifically, we propose a new memory-augmented layer, and based on it, different augmented strategies are explored to build the memory representation and then adaptively fuse it into the domain-specific PLM. We demonstrate the effectiveness of G-MAP on various domains (biomedical and computer science publications, news, and reviews) and different kinds (text classification, QA, NER) of tasks, and the extensive results show that the proposed G-MAP can achieve SOTA results on all tasks. © 2022 Association for Computational Linguistics.

关键词： Computational linguistics

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Optimizing interactive performance for desktop-virtualization environment

Optimizing interactive performance for desktop-virtualizatio...

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Joint International Conference on Pervasive computing and the Networked World, ICPCA/SWS 2012

作者： Wang, Xiaolin Zhang, Binbin Luo, Yingwei Dept. of Computer Science and Technology Peking University Beijing 100871 China Dept. of Computer Science and Engineering Yunnan University Yunnan 650091 China Shenzhen Key Lab. for Cloud Computing Technology and Applications Peking University Shenzhen Graduate School Guangdong 518055 China

ISBN: (纸本)9783642370144

Full virtualization is vastly applied in desktop virtualization. Although hardware-assisted virtualization greatly improves the performance, the interactive performance is still a bottleneck for full virtualization. Interactive performance is mainly influenced by I/O devices. In one hand, I/O devices are slow device. In another hand, they are often shared by multiple virtual machines through simulation. Our study focuses on the interactive performance optimization, and can mainly be classified into three categories: (1) Targeting multi-core system, we investigate virtual machine deployment to ensure stable performance of the whole system and individual virtual machine. (2) Dynamically adjust the resource among virtual machines based on the individual machine's interactive behavior. (3) Optimize the I/O request scheduler in term of the virtualization implementation. © 2013 Springer-Verlag.

关键词： Virtual machine

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International Conference on Networking and Distributed computing (ICNDC)

作者： Kai Lei Qian Yu Rui Ning Shenzhen Key Lab for Cloud Computing Technology & Applications (SPCCTA) Peking University Shenzhen P.R. China

Smart Mobile device are becoming popular platforms for information accessing, especially when coupled with recommendation system technologies. They are also treated as key tools for mobile users both for leisure and business applications. Recommendation techniques can increase the usability of mobile systems by providing more personalized and interested content. In this paper, a novel personalized recommender system is proposed, focusing on Mobile Terminal (MT) similarities, such as brands, versions and types of Operating Systems. These similarities play a key role in filtering original recommendation data sets at the preprocessing stage. By calculating and comparing the Mean Absolute Error (MAE) values through 5-fold cross validation of the Slope One algorithm with/without optimizing data sets by device-similarity, the overall effectiveness and accuracy of the recommendation results are at least 20% improved in our experiment.

关键词： Mobile communication Context Mobile handsets Filtering Operating systems Educational institutions Collaboration

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