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Dynamics of tripartite geometric quantifiers of correlations in a quantum spin system

Physical Review A 2013年第6期87卷 062315-062315页

作者： Jiang Zhou Hong Guo []The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science and Center for Computational Science and Engineering Peking University Beijing 100080 People's Republic of China

We derive an exact formula of geometric measure of quantum discord (GMQD) for an arbitrary 3-qubit state. The dynamics of GMQD in a quantum spin system coupled to a thermal bath is studied by simulation and analytical approximation. It is found that tripartite quantum discord has distinct time behaviors within two different eigenspaces. Further, we extend the square norm distance to define tripartite geometric quantifiers of total and classical correlations. We obtain their explicit expressions and discuss the possibility of having a closed additive relation among various kinds of correlations during the dynamical evolution.

关键词： QUBITS QUANTUM states OPTICS RESEARCH QUANTUM spin models

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Incentive Mechanism for Collaborative Smartphone Sensing using Overlapping Coalition Formation Games

Incentive Mechanism for Collaborative Smartphone Sensing usi...

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IEEE Global communications Conference

作者： Boya Di Tianyu Wang Lingyang Song Zhu Han State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electrical Engineering and Computer Science Peking University Electrical and Computer Engineering Department University of Houston

ISBN: (纸本)9781479913510

With the rapid growth of sensor technology, smart-phone sensing has become an effective approach to help improve the quality of applications in smartphones. However, the quality and quantity of the sensed data uploaded by the users are not always satisfying due to the lack of incentives for users to participate. In this paper, we design an incentive mechanism in which the users can get satisfying rewards from the platform by efficiently allocating their resources, and meanwhile, the platform can achieve a relatively high social welfare. Specifically, to solve the resource allocation problem in the incentive mechanism, we consider a cooperative game model with overlapping coalitions, in which the smartphone users can self-organize into the over-lapping coalitions for different sensing tasks. Then, we propose a distributed algorithm that converges to a stable outcome in which no user has the motivation to change its current resource allocation so as to increase its individual payoff unilaterally. Simulation results show that the proposed scheme achieves a better performance than the average distribution case and the single-task distribution case in various conditions.

关键词： Smartphone Consumers incentives Resource utilization Game theory distributed algorithms Interest groups

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An external modulator model for optical injection-locked semiconductor lasers

An external modulator model for optical injection-locked sem...

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International Conference on Photonics in Switching (PS)

作者： Peng Guo Lixin Zhu Anshi Xu Zhangyuan Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing China

An external modulator model is proposed to analyze the optical injection-locked semiconductor lasers. This model provides a novel perspective of many characteristics of OIL-SLs, including negative chirp modulation, ph... 详细信息

ISBN: (纸本)9784885522710

关键词： Optical modulation Optical sensors Optical transmitters Vertical cavity surface emitting lasers Optical reflection High-speed optical techniques

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Tightly-Coupled Integrated LR-WPAN/WiMAX Network: Architecture and Performance Modelling

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IERI Procedia 2013年 4卷 59-67页

作者： Ayyoub Akbari-Moghanjoughi Aduwati Sali José Roberto Amazonas Burhanuddin Mohd Ali Shamala Subramaniam Sabira Khatun Department. of Computer & Communications Systems Engineerin Faculty of Engineering Universiti Putra Malaysia Department of Telecommunications and Control Engineering of Escola Politécnica of the University of São Paulo Brazil Department of Communication Technology & Networks Faculty of Computer Science and IT Universiti Putra Malaysia School of Computer and Communication Engineering Universiti Malaysia Perlis Malaysia

In this paper a general architecture of tightly-coupled integrated LR-WPAN/WiMAX network has been introduced by proposing and utilising a novel access router named Wireless Integrated Access Router (WIAR). The suggested access router effectively combines both WiMAX and LR-WPAN technologies in a same device. The main motivation to propose this integration is to deploy Internet of Things (IoT) applications and services in wide area networks. Using WiMAX as backhaul service, the Internet connection can be provided for dispersed mobile LR-WPAN users over a wide area. Moreover, it enables to access all collected data in the local LR-WPAN coverage area – which is named as Senspot in this paper – by third-party clients through the Internet. Furthermore, an analytic model has been developed for the integrated network to evaluate the system's performance. Theoretical results on blocking probability of new and handover calls from WiMAX subscribers, as well as new connections from LR-WPAN Senspots in a cell of WiMAX have been investigated in terms of call/connection rates and number of allocated channels.

关键词： Backhaul Support Heterogeneous Wireless Network IoT networks Integration WiMAX LR-WPAN.

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Compact and wideband optical 90° hybrid based on silicon-on-insulator

Compact and wideband optical 90° hybrid based on silicon-on...

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IEEE International Conference on Group IV Photonics

作者： Mei Yin Wei Yang Yawen Huang Huaxiang Yi Yanping Li Xingjun Wang Hongbin Li State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing China

We propose a compact SOI optical 9076; hybrid which shows excess loss less than 1dB,imbalance less than 0.26dB over C-band and phase accuracy better than 576; with bandwidth about 90nm.

We propose a compact SOI optical 90° hybrid which shows excess loss less than 1dB,imbalance less than 0.26dB over C-band and phase accuracy better than 5° with bandwidth about 90nm.

关键词： Couplers Optical devices Optical coupling

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Nonlinear analysis of dynamical complex networks 2014

Abstract and Applied Analysis

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Abstract and Applied Analysis 2014年第SI42期2014卷 1-4页

作者： Wang, Zidong Shen, Bo Dong, Hongli Hu, Jun He, Xiao Ding, Derui Department of Computer Science Brunel University Uxbridge Middlesex UB8 3PH United Kingdom Communication Systems and Networks (CSN) Research Group Faculty of Engineering King Abdulaziz University Jeddah 21589 Saudi Arabia School of Information Science and Technology Donghua University Shanghai 200051 China College of Electrical and Information Engineering Northeast Petroleum University Daqing 163318 China Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin 150001 China Department of Applied Mathematics Harbin University of Science and Technology Harbin 150080 China Department of Automation Tsinghua University Beijing 100084 China Department of Applied Mathematics Anhui Polytechnic University Wuhu 241000 China

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LQ-servo congestion control for TCP/AQM system in wireless network environment

International Journal of Control and Automation

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International Journal of Control and Automation 2013年第3期6卷 281-290页

作者： Yang, Jihoon Lim, Dongkyun Oh, Wongeun Centre for Communication Systems Research University of Surrey Guildford Surrey GU2 7XH United Kingdom Computer Science Engineering Hanyang Cyber University 222 Wangshimni-ro Seongdong-gu Seoul 133-791 Korea Republic of Department of Multimedia Engineering Sunchon National University 255 Jungang-ro Suncheon Jeollanam-do 540-950 Korea Republic of

This paper presents LQ-Servo controller for congestion control in TCP/AQM wireless networks environment using previously developed controller. A wireless networks link has a capacity which is time-varying. For this, it is modeled by three-state mode for considering the dynamics of wireless links in this paper. And the proposed controller structure is made by augmenting a new state variable to the feed-forward loop.

关键词： Wireless networks

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Tightly-Coupled Integrated LR-WPAN/WiMAX Network:Architecture and Performance Modelling

Tightly-Coupled Integrated LR-WPAN/WiMAX Network:Architectur...

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2013 International Conference on Electronic Engineering and computer science(EECS 2013)

作者： Ayyoub Akbari-Moghanjoughi Aduwati Sali José Roberto Amazonas Burhanuddin Mohd Ali Shamala Subramaniam Sabira Khatun Department. of Computer & Communications Systems Engineerin Faculty of Engineering Universiti Putra Malaysia Department of Telecommunications and Control Engineering of Escola Politécnica of the University of S?o Paulo Department of Communication Technology & Networks Faculty of Computer Science and IT Universiti Putra Malaysia School of Computer and Communication Engineering Universiti Malaysia Perlis

In this paper a general architecture of tightly-coupled integrated LR-WPAN/Wi MAX network has been introduced by proposing and utilising a novel access router named Wireless Integrated Access Router(WIAR). The suggested access router effectively combines both Wi MAX and LR-WPAN technologies in a same device. The main motivation to propose this integration is to deploy Internet of Things(Io T) applications and services in wide area networks. Using Wi MAX as backhaul service, the Internet connection can be provided for dispersed mobile LR-WPAN users over a wide area. Moreover, it enables to access all collected data in the local LR-WPAN coverage area – which is named as Senspot in this paper – by third-party clients through the Internet. Furthermore, an analytic model has been developed for the integrated network to evaluate the system's performance. Theoretical results on blocking probability of new and handover calls from Wi MAX subscribers, as well as new connections from LR-WPAN Senspots in a cell of Wi MAX have been investigated in terms of call/connection rates and number of allocated channels.

关键词： Backhaul Support Heterogeneous Wireless Network IoT networks Integration WiMAX LR-WPAN

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Changing Perspectives of Time in HCI 31

Changing Perspectives of Time in HCI

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31st Annual CHI Conference on Human Factors in Computing systems:, CHI EA 2013

作者： Lindley, Siân Corish, Robert Ferreira, Pedro Simbelis, Vygandas Vaara, Elsa Socio-Digital Systems Microsoft Research Cambridge 7 JJ Thomson Avenue CambridgeCB3 0FB United Kingdom School of Computer Science and Communication Royal Institute of Technology StockholmSE – 100 Sweden Mobile Life SICS Box 1263 KistaSE-16429 Sweden

ISBN: (纸本)9781450318990

The aim of this workshop is to unpack different ways of thinking about time, drawing a distinction between time as experienced, and time as counted by a ticking clock or measured by a computer algorithm. The concept of time is often taken for granted within HCI, yet highlighting the assumptions that underpin it could provide a resource for research and innovation. In this extended abstract, we illustrate how this is so.

关键词： Clocks

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Overlapping coalitional games for collaborative sensing in cognitive radio networks

Overlapping coalitional games for collaborative sensing in c...

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IEEE Conference on Wireless communications and Networking

作者： Tianyu Wang Lingyang Song Zhu Han Walid Saad State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electrical Engineering and Computer Science Peking University China Electrical and Computer Engineering Department University of Houston Houston TX USA Electrical and Computer Engineering Department University of Miami Coral Gables FL USA

ISBN: (纸本)9781467359382

Collaborative spectrum sensing (CSS) has been shown to be able to highly improve the performance of spectrum sensing in cognitive radio networks. However, most existing works focused on either centralized approaches that rely on a global fusion center, thus requiring significant overhead, or on distributed approaches that rely on disjoint coalitions of secondary users (SUs) in which an SU can only cooperate with a single, selected coalition, hence limiting the performance gains of CSS. In this paper, a novel, coalition-based approach to CSS is proposed in which an SU can share its sensing results with more than one coalition. The problem is formulated using a novel class of cooperative games, known as overlapping coalitional games, which enables the SUs to decide, in a distributed manner, on the number of coalitions in which they wish to cooperate, depending on the associated benefit and cost tradeoffs. To solve this game, a novel, distributed algorithm is proposed using which the SUs can self-organize into a stable overlapping coalitional structure. Simulation results show that our proposed algorithm significantly improves the performance in terms of both the average probability of misdetection and the convergence time, relative to the noncooperative case and the state-of-art cooperative CSS with non-overlapping coalitions.

关键词： Sensors Cascading style sheets Games Partitioning algorithms Collaboration Fading Educational institutions

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