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Explicit Rate Based Transmission Control Scheme in Vehicle-to-lnfrastructure Communication Networks

China Communications 2014年第1期11卷 46-59页

作者： BI Yuanguo Xuemin (Sherman) SHEN ZHAO Hai College of Information Science and Engineering Northeastern University Shenyang 110819 China Shenyang Ligong University Shenyang 110159 China Department of Electrical and Computer Engineering University of Waterloo Waterloo N2L 3G 1 Canada

In Vehicle-to-infrastructure(V2I)communication networks,mobile users are able to access Internet services,such as video streaming,digital map downloading,database access,online gaming,and even safety services like accident alarm,traffic condition broadcast,etc.,through fixed roadside ***,the dynamics of communication environment and frequent changing topology critically challenge the design of an efficient transport layer protocol,which makes it difficult to guarantee diverse Quality of Service(QoS) requirements for various *** this paper,we present a novel transport layer scheme in infrastructure based vehicular networks,and aim to resolve some challenging issues such as source transfer rate adjustment,congestion avoidance,and *** precisely detecting packet losses and identifying various causes of these losses(for example,link disconnection,channel error,packet collision,buffer overflow),the proposed scheme adopts different reacting mechanisms to deal with each of the ***,it timely monitors the buffer size of the bottleneck Road-Side Unit(RSU),and dynamically makes transfer rate feedbacks to source nodes to avoid buffer overflow or ***,analysis and simulation results show that the proposed scheme not only successfully reduces packet losses because of buffer overflow and link disconnection but also improves the utilization efficiency of channel resource.

关键词： transmission control loss differentiation congestion avoidance buffer over- flow vehicle-to-infrastructure communications

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End-to-End Rate Adaptation to Support Heterogeneous Services for Infrastructure-Based Vehicular Networks

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ZTE Communications 2014年第1期12卷 3-10页

作者： Yuanguo Bi Hangguan Shan Xuemin (Sherman) Shen Hai Zhao College of Information Science and Engineering Northeastern University Institute of Information and Communication Engineering Zhejiang University Department of Electrical and Computer Engineering University of Waterloo

Vehicle to Infrastructure （V2I） communications aim to provide mobile users on the road low-cost Internet and driver safety services. However, to meet Quality of Service （QoS） requirements of various applications and officiently utilize limited wireless channel resourc- es, the transport layer protocol has to perform effective rate control in low channel quality and frequent changing topology communica- tion environment. In this paper, we propose a novel rate-control scheme in infrastructure based vehicular networks that avoids conges- tion and starvation and promotes fairness in end-to-end V2I communications. In vehicular networks, a bottleneck roadside unit （RSU） keeps track of its buffer size, aggregate incoming rate, and link throughput, and appropriately allocates bandwidth to traversing flows. With feedback information from the RSU, source nodes dynamically adjust their sending rates to avoid buffer overflow or starvation at the bottleneck RSU. Simulation results show that the proposed scheme can reduce not only packet losses owing to buffer overflow but also buffer starvation time, which improves the utilization efficiency of wireless channel resource.

关键词： vehicle to infrastructure communications roadside unit congestion avoidance starvation avoidance transport layer

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Model simulations of the annual cycle of the landfast ice thickness in the East Siberian Sea

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Advances in Polar Science 2015年第2期26卷 168-178页

作者： YANG Yu Matti Leppranta LI Zhijun Bin Cheng ZHAI Mengxi Denis Demchev Department of Basic Sciences Shenyang Institute of Engineering Department of Physics University of Helsinki State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Finnish Meteorological Institute Beijing Normal University Nansen International Environmental Remote Sensing Centre (NIERSC)

The annual cycle of the thickness and temperature of landfast sea ice in the East Siberian Sea has been examined using a one-dimensional thermodynamic model. The model was calibrated for the year August 2012-July 2013, forced using the data of the Russian weather station Kotel＇ny Island and ECMWF reanalyses. Thermal growth and decay of ice were reproduced well, and the maximum annual ice thickness and breakup day became 1.64 m and the end of July. Oceanic heat flux was 2 W.m^-2 in winter and raised to 25 W.m^-2 in summer, albedo was 0.3-0.8 depending on the surface type （snow/ice and wet/dry）. The model outcome showed sensitivity to the albedo, air temperature and oceanic heat flux. The modelled snow cover was less than 10 cm having a small influence on the ice thickness. In situ sea ice thickness in the East Siberian Sea is rarely available in publications. This study provides a method for quantitative ice thickness estimation by modelling. The result can be used as a proxy to understand the sea ice conditions on the Eurasian Arctic coast, which is important for shipping and high-resolution Arctic climate modelling.

关键词： landfast sea ice New Siberian Islands ice growth ice decay oceanic heat flux snow albedo

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Data-driven Decoupling Control for Gas Collector Pressure System of Coke Ovens

Data-driven Decoupling Control for Gas Collector Pressure Sy...

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第30届中国控制与决策会议

作者： Yongpeng Weng Ning Wang Xinming Liu College of Marine Electrical Engineering Dalian Maritime University College of Electrical and Control Engineering Liaoning Technical University

This paper investigates the problem of robust tracking control of the coke oven gas collector pressure system(GCPS) with nonlinearity, time-variations, couplings, disturbances and uncertainties. First, utilizing the nonparameter dynamic linearization technique(NDLT), the complex GCPS is transformed into a linear time-varying system. Then, in light of the sliding mode observer(SMO) strategy, a novel data-driven decoupling control(DDDC) scheme with adaptive laws is proposed to deal with the nonlinearity, time-variations, couplings, disturbances and uncertainties. Under the framework of data-driven control, it is theoretically shown that the tracking error of the closed-loop GCPS is asymptotically convergent. Lastly, simulation results also show that good tracking performance is achieved by the proposed DDDC approach.

关键词： Gas Collector Pressure System nonparameter dynamic linearization technique Data-driven Control Decoupling Control

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