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11th ACM Conference on Embedded Networked Sensor Systems, SenSys 2013

作者： Landsiedel, Olaf Ferrari, Federico Zimmerling, Marco Department of Computer Science and Engineering Chalmers University of Technology Sweden Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781450320276

An important building block for low-power wireless systems is to effciently share and process data among all devices in a network. However, current approaches typically split such all-to-all interactions into sequential collection, processing, and dissemination phases, thus handling them ineffciently. We introduce Chaos, the first primitive that natively sup-ports all-to-all data sharing in low-power wireless networks. Different from current approaches, Chaos embeds program-able in-network processing into a communication support based on synchronous transmissions. We show that this de-sign enables a variety of common all-to-all interactions, including network-wide agreement and data aggregation. Re-sults from three testbeds and simulations demonstrate that Chaos scales eficiently to networks consisting of hundreds of nodes, achieving severalfold improvements over LWB and CTP/Drip in radio duty cycle and latency with almost 100% reliability across all scenarios we tested. For example, Chaos computes simple aggregates, such as the maximum, in a 100- node multi-hop network within less than 90 milliseconds.

关键词： Low power electronics

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Cool shapers: Shaping real-time tasks for improved thermal guarantees

Cool shapers: Shaping real-time tasks for improved thermal g...

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作者： Kumar, Pratyush Thiele, Lothar Computer Engineering and Networks Laboratory ETH Zürich Switzerland

ISBN: (纸本)9781450306362

With increasing power densities, managing on-chip temperatures has become an important design challenge. We propose a novel approach to this problem with the use of shapers to dynamically and selectively insert idle times during the execution of hard real-time jobs on a single speed processor. For the class of leaky bucket shapers which have a light-weight implementation, we derive the shaper such that no job misses its real-time deadline and the peak temperature is optimally reduced. The analysis and design of such shapers allows for dynamically variable streams of jobs;for instance, periodic streams with jitter. We extend our results to consider non-zero power and timing overhead in transitioning to the idle mode. With experimental results, we demonstrate that the proposed approach provides a large improvement: on average 8K peak temperature reduction or 40% increase in utilization for a given peak temperature. © 2011 ACM.

关键词： Real time systems

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The bus goes wireless: Routing-free data collection with QoS guarantees in sensor networks

The bus goes wireless: Routing-free data collection with QoS...

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2012 IEEE International Conference on Pervasive Computing and Communications Workshops, PERCOM Workshops 2012

作者： Ferrari, Federico Zimmerling, Marco Thiele, Lothar Mottola, Luca Computer Engineering and Networks Laboratory ETH Zurich Switzerland Swedish Institute of Computer Science Kista Sweden

ISBN: (纸本)9781467309073

We present the low-power wireless bus (LWB), a new communication paradigm for QoS-aware data collection in low-power sensor networks. The LWB maps all communication onto network floods by using Glossy, an efficient flooding architecture for wireless sensor networks. Therefore, unlike current solutions, the LWB requires no information of the network topology, and inherently supports networks with mobile nodes and multiple data sinks. A LWB prototype implemented in Contiki guarantees bounded end-to-end communication delay and duplicate-free, in-order packet delivery - key QoS requirements in many control and mission-critical applications. Experiments on two testbeds demonstrate that the LWB prototype outperforms state-of-the-art data collection and link layer protocols, in terms of reliability and energy efficiency. For instance, we measure an average radio duty cycle of 1.69 % and an overall data yield of 99.97% in a typical data collection scenario with 85 sensor nodes on Twist. © 2012 IEEE.

关键词： Network topology

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Active optical clock based on four-level quantum system

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Chinese Science Bulletin 2013年第18期58卷 2033-2038页

作者： ZHANG TongGang WANG YanFei ZANG XiaoRun ZHUANG Wei CHEN JingBiao State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum ElectronicsSchool of Electronics Engineering & Computer SciencePeking University

Active optical clock,a new conception of atomic clock,has been proposed *** this work,we propose a scheme of active optical clock based on four-level quantum *** final accuracy and stability of two-level quantum system are limited by second-order Doppler shift of thermal atomic *** three-level quantum system,they are mainly limited by light shift of pumping laser *** limitations can be avoided effectively by applying the scheme proposed *** atom four-level quantum system,as a typical example,is *** population inversion between 6S 1/2 and 5P 3/2 states can be built up at a time scale of 10-6 *** the mechanism of active optical clock,in which the cavity mode linewidth is much wider than that of the laser gain profile,it can output a laser with quantum-limited linewidth narrower than 1 Hz in *** experimental configuration is designed to realize this active optical clock.

关键词：主动光学量子系统四能级时钟三能级系统激光增益多普勒频移粒子数反转

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Factoring larger integers with fewer qubits via quantum annealing with optimized parameters

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Science China(Physics,Mechanics & Astronomy) 2019年第6期62卷 5-12页

作者： WangChun Peng BaoNan Wang Feng Hu YunJiang Wang XianJin Fang XingYuan Chen Chao Wang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data ScienceShanghai University State Key Laboratory of Integrated Services Networks (ISN) Xidian University School of Computer Science and Technology Engineering Anhui University of Science and Technology State Key Laboratory of Cryptology

RSA cryptography is based on the difficulty of factoring large integers, which is an NP-hard(and hence intractable) problem for a classical computer. However, Shor's algorithm shows that its complexity is polynomial for a quantum computer, although technical difficulties mean that practical quantum computers that can tackle integer factorizations of meaningful size are still a long way away. Recently, Jiang et al. proposed a transformation that maps the integer factorization problem onto the quadratic unconstrained binary optimization(QUBO) model. They tested their algorithm on a D-Wave 2000 Q quantum annealing machine, raising the record for a quantum factorized integer to 376289 with only 94 qubits. In this study, we optimize the problem Hamiltonian to reduce the number of qubits involved in the final Hamiltonian while maintaining the QUBO coefficients in a reasonable range, enabling the improved algorithm to factorize larger integers with fewer qubits. Tests of our improved algorithm using D-Wave's hybrid quantum/classical simulator qbsolv confirmed that performance was improved, and we were able to factorize 1005973, a new record for quantum factorized integers, with only 89 qubits. In addition, our improved algorithm can tolerate more errors than the original one. Factoring 1005973 using Shor's algorithm would require about 41 universal qubits,which current universal quantum computers cannot reach with acceptable accuracy. In theory, the latest IBM Q System OneTM(Jan. 2019) can only factor up to 10-bit integers, while the D-Wave have a thousand-fold advantage on the factoring scale. This shows that quantum annealing machines, such as those by D-Wave, may be close to cracking practical RSA codes, while universal quantum-circuit-based computers may be many years away from attacking RSA.

关键词： integer factorization quantum annealing QUBO D-Wave

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A low-complexity sensor fusion algorithm based on a fiber-optic gyroscope aided camera pose estimation system

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Science China(Information Sciences) 2016年第4期59卷 160-171页

作者： Zhongwei TAN Chuanchuan YANG Yuliang LI Yan YAN Changhong HE Xinyue WANG Ziyu WANG State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University School of Information Science and Technology Xiamen University College of Information and Electrical Engineering China Agricultural University

Visual tracking, as a popular computer vision technique, has a wide range of applications, such as camera pose estimation. Conventional methods for it are mostly based on vision only, which are complex for image processing due to the use of only one sensor. This paper proposes a novel sensor fusion algorithm fusing the data from the camera and the fiber-optic gyroscope. In this system, the camera acquires images and detects the object directly at the beginning of each tracking stage; while the relative motion between the camera and the object measured by the fiber-optic gyroscope can track the object coordinate so that it can improve the effectiveness of visual tracking. Therefore, the sensor fusion algorithm presented based on the tracking system can overcome the drawbacks of the two sensors and take advantage of the sensor fusion to track the object accurately. In addition, the computational complexity of our proposed algorithm is obviously lower compared with the existing approaches(86% reducing for a 0.5 min visual tracking). Experiment results show that this visual tracking system reduces the tracking error by 6.15% comparing with the conventional vision-only tracking scheme(edge detection), and our proposed sensor fusion algorithm can achieve a long-term tracking with the help of bias drift suppression calibration.

关键词： visual tracking camera pose estimation fiber-optic gyroscope low-complexity sensor fusion

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BIdM:A Blockchain-Enabled Cross-Domain Identity Management System

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Journal of Communications and Information networks 2021年第1期6卷 44-58页

作者： Ruibiao Chen Fangxing Shu Shuokang Huang Lei Huang Huafang Liu Jin Liu Kai Lei ICNLab School of Electronic and Computer EngineeringPeking UniversityShenzhen 518000China PCL Research Center of Networks and Communications Peng Cheng LaboratoryShenzhen 518000China

Reliable identity management and authentication are significant for network *** recent years,as traditional centralized identity management systems suffer from security and scalability problems,decentralized identity management has received considerable attention in academia and ***,with the increasing sharing interaction among each domain,management and authentication of decentralized identity has raised higher requirements for cross-domain trust and faced implementation challenges *** solve these problems,we propose BIdM,a decentralized crossdomain identity management system based on *** design a decentralized identifier(DID)for naming identities based on the consortium blockchain *** the identity subject fully controls the life cycle and ownership of the proposed DID,it can be signed and issued without a central authentication node’s ***,every node in the system can participate in identity authentication and trust establishment,thereby solving the centralized mechanism’s single point of failure *** further improve authentication efficiency and protect users’privacy,BIdM introduces a one-way accumulator as an identity data structure,which guarantees the validity of entity *** theoretically analyze the feasibility and performance of BIdM and conduct evaluations on a prototype *** experimental results demonstrate that BIdM achieves excellent optimization on cross-domain authentication compared with existing identity management systems.

关键词： decentralized identifier blockchain oneway accumulator cross-domain authentication identity management

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Diff-MAC: A QoS-Aware MAC protocol with differentiated services and hybrid prioritization for wireless multimedia sensor networks 6

Diff-MAC: A QoS-Aware MAC protocol with differentiated servi...

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6th ACM Symposium on Quality of Service and Security for Wireless and Mobile networks, Q2SWinet 2010

作者： Aykut Yigitel, M. Durmaz Incel, Ozlem Ersoy, Cem Computer Networks Research Laboratory Netlab Department of Computer Engineering Bogazici University Istanbul34342 Turkey

ISBN: (纸本)9781450302753

Popularity of Wireless Sensor networks (WSNs) combined with the multimedia requirements of new applications have enabled Wireless Multimedia Sensor networks (WMSNs) which commonly carry heterogeneous traffic. In order to deliver multiple types of traffic with different requirements in highly resource constrained sensor networks, Quality of Service (QoS) provisioning becomes unavoidable. In this work, we propose Diff-MAC;a QoS-Aware and priority-based MAC protocol for WMSNs. Diff-MAC aims to increase the utilization of the channel with effective service differentiation mechanisms while providing fair and fast delivery of the QoS-constrained data. Performance evaluation results of Diff-MAC, obtained through extensive simulations, show significant improvements, in terms of latency, data delivery and energy efficiency, compared to two other existing protocols. Copyright 2010 ACM.

关键词： Quality of service

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Towards silicon photonic neural networks for artificial intelligence

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Science China(Information Sciences) 2020年第6期63卷 105-118页

作者： Bowen BAI Haowen SHU Xingjun WANG Weiwen ZOU State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Engineering and Computer Science Peking University Frontiers Science Center for Nano-optoelectronics Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center(iMLic) Department of Electronic Engineering Shanghai Jiao Tong University

Brain-inspired photonic neural networks for artificial intelligence have attracted renewed interest. For many computational tasks, such as image recognition, speech processing and deep learning, photonic neural networks have the potential to increase the computing speed and energy efficiency on the orders of magnitude compared with digital electronics. Silicon Photonics, which combines the advantages of electronics and photonics, brings hope for the large-scale photonic neural network integration. This paper walks through the basic concept of artificial neural networks and focuses on the key devices which construct the silicon photonic neuromorphic systems. We review some recent important progress in silicon photonic neural networks, which include multilayer artificial neural networks and brain-like neuromorphic systems, for artificial intelligence. A prototype of silicon photonic artificial intelligence processor for ultra-fast neural network computing is also proposed. We hope this paper gives a detailed overview and a deeper understanding of this emerging field.

关键词： photonic neural networks artificial intelligence deep learning photonic computing accelerator silicon photonics

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Replica horizontal-shuffled iterative decoding of low-density parity-check codes

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The Journal of China Universities of Posts and Telecommunications 2010年第6期17卷 32-40页

作者： YANG Yang HUANG Jian-zhong TONG Sheng WANG Xin-mei State Key Laboratory of Integrated Service Networks Xidian University Xi'an 710071 China Department of Electrical and Computer Engineering University of Connecticut Storrs CT 06269 USA

For practical considerations,it is essential to accelerate the convergence speed of the decoding algorithm used in an iterative decoding system. In this paper,replica versions of horizontal-shuffled decoding algorithms for low-density parity-check （LDPC） codes are proposed to improve the convergence speed of the original versions. The extrinsic information transfer （EXIT） chart technique is extended to the proposed algorithms to predict their convergence behavior. Both EXIT chart analysis and numerical results show that replica plain horizontal-shuffled （RPHS） decoding converges much faster than both plain horizontal-shuffled （PHS） decoding and the standard belief-propagation （BP） decoding. Furthermore,it is also revealed that replica group horizontal-shuffled （RGHS） decoding can increase the parallelism of RPHS decoding as well as preserve its high convergence speed if an equivalence condition is satisfied,and is thus suitable for hardware implementation.

关键词： replica shuffled decoding LDPC codes EXIT chart convergence speed

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