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IEEE International Conference on Robotics and Automation (ICRA)

作者： Sha Ye Kenji Suzuki Yosuke Suzuki Masatoshi Ishikawa Makoto Shimojo Mechanical Engineering and Intelligent Systems University of Electro-Communications Chofu Tokyo Japan Department of Information Physics and Computing Graduate School of Information Science and Technology University of Tokyo Bunkyo Tokyo Japan

ISBN: (纸本)9781467356404

In this paper, we focus on unknown parameters such as the position and attitude of the object, and describe a short-range, high-speed and noncontact sensing method for obtaining the position and attitude of the object using IR Net-Structure Proximity Sensor (“IR-NSPS”) which complements the dead region of sensory information between visual and tactile sensing. To be more precise, we propose two effective control methods which are pre-shaping and object positioning using IR-NSPS for robust grasping by adjusting the gripper configuration in response to attitude error of up to ±45 deg and the position error of up to ±80 mm of the unknown object. The methods therefore can significantly increase the speed and effectiveness of grasping objects without requiring a specific approach that depends on a vision sensor. Furthermore, to demonstrate the advantages of pre-shaping and object positioning, object grasping experiments were performed using these two operations to grasp objects placed randomly on a tabletop.

关键词： Grasping Position measurement Tactile sensors Robustness

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Center-surround interactions in a network model of layer 4Cα of primary visual cortex

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BMC Neuroscience 2013年第1期14卷 1-2页

作者： Christoph Metzner Achim Schweikard Bartosz Zurowski Institute for Robotics and Cognitive Systems University of Luebeck 23538 Luebeck Germany Graduate School for Computing in Medicine and Life Sciences University of Luebeck 23538 Luebeck Germany Department of Psychiatry University Clinics Schleswig-Holstein 23538 Luebeck Germany

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An evaluation of vehicular networks with real vehicular GPS traces

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Eurasip Journal on Wireless Communications and Networking 2013年第1期2013卷 1页

作者： Zhu, Yanmin Chen, Chao Gao, Min Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Shanghai Key Lab of Scalable Computing and Systems Shanghai 200240 China HKUST Fok Ying Tung Graduate School Guangzhou 510730 China

Vehicular networks have attracted increasing attention from both the academy and industry. Applications of vehicular networks require efficient data communications between vehicles, whose performance is concerned with delivery ratio, delivery delay, and routing cost. The most previous work of routing in vehicular networks assumes oversimplified node mobility when evaluating the performance of vehicular networks, e.g., random mobility or artificial movement traces, which fails to reflect the inherent complexity of real vehicular networks. To understand the achievable performance of vehicular networks under real and complex environments, we first comprehensively analyze the affecting factors that may influence the performance of vehicular networks and then introduce four representative routing algorithms of vehicular networks, i.e., Epidemic, AODV, GPSR, and MaxProp. Next, we develop an NS-2 simulation framework incorporating a large dataset of real taxi GPS traces collected from around 2,600 taxis in Shanghai, China. With this framework, we have implemented the four routing protocols. Extensive trace-driven simulations have been performed to explore the achievable performance of real vehicular networks. The impact of the controllable affecting factors is investigated, such as number of nodes, traffic load, packet TTL, transmission range, and propagation model. Simulation results show that a real vehicular network has surprisingly poor data delivery performance under a wide range of network configurations for all the routing protocols. This strongly suggests that the challenging characteristics of vehicular networks, such as unique node mobility, constraints of road topology, need further exploration. © 2013 Liao et al.;licensee Springer.

关键词： Routing protocols

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A proposal of network architecture for narrowband V2X communication 20

A proposal of network architecture for narrowband V2X commun...

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20th Intelligent Transport systems World Congress, ITS 2013

作者： Sato, Kenya Matsumoto, Erika Shimada, Hideki Yamaguchi, Akihiro Honda, Shinya Takada, Hiroaki Mobility Research Center Doshisha University 1-3 Tatara Miyakodan Kyotanabe-shi Kyoto610-0321 Japan Graduate School of Information and Computer Science Doshisha University 1-3 Tatara Miyakodan Kyotanabe-shi Kyoto610-0321 Japan Department of Information Systems Design Doshisha University 1-3 Tatara Miyakodan Kyotanabe-shi Kyoto610-0321 Japan Center for Embedded Computing Systems Nagoya University Furo-cho Chikusa-ku Nagoya Japan

Recently Cooperative ITS has been researched and developed around the world. Cooperative ITS is an attempt to let vehicles utilize information gathered from the environment via V2X (V2V/V2I) in addition to those collected by the vehicle itself. In North America and Europe, the 5.9 GHz wireless communication band is planned for use, which can provide 7 or 8 channels. Meanwhile, the only frequency band available for ITS use in Japan is the 700 MHz band with a single channel. It is required that we develop an ITS network architecture that can provide location transparency over narrowband V2X (V2V/V2I) communications, especially if Japan is interoperable with European and American countries in expanding its technologies. In this paper, to achieve location transparency in Japan with its narrowband V2V/V2I communications, we propose that high-speed mobile telecommunication technologies such as LTE is employed in combination with narrowband communications. Context-aware network controls that consider the data's size and latency tolerance, by setting priorities in accordance with vehicle circumstances can be employed to switch between the networks. Moreover, to achieve location transparency, we developed an application framework using stream processing technique with an optimization algorithm that places the features on physical nodes based on the given network architecture, bandwidth and computational resources.

关键词： Vehicles

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Dynamically identifying roles in social media by mapping real world

Dynamically identifying roles in social media by mapping rea...

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IEEE International Conference on Ubi-Media computing

作者： Bo Wu Qun Jin Xiaokang Zhou Wei Wang Fuhua Lin Henry Leung Graduate School of Human Sciences Waseda University Tokorozawa Japan School of Computing and Information Systems Athabasca University Edmonton Canada Department of Electrical and Computer Engineering University of Calgary Calgary Alberta Canada

With the rapid growing of users in the SNS environments, their network relationships in Internet have become as complex as in the real world. On the other hand, the user's social role plays an important role in providing individualized services, such as information recommendation in the SNS environments. However, as we know, people will switch or change their social roles dynamically in the real society, which is also true in the cyber network space, such as SNS. In this paper, we present a basic model to describe social roles in both the real world and the SNS environment, in which a set of attributes and factors are considered and introduced to represent the time-changing social roles in different situations and contexts. The mechanism that we develop to identify the roles is twofold: mapping of real world situations to cyber space, and analyzing social role attributes based on the mapping and synthesizing. We further describe an application scenario in regard to how to map the different situations and analyze the role attributes, in order to dynamically identify roles in the cyber space.

关键词： Media Context Educational institutions Switches Analytical models Communities Social network services

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Architecture for resource controllable NVE to meet service providers' dynamic QoS demands

Architecture for resource controllable NVE to meet service p...

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International Conference on the Network of the Future (NOF)

作者： Masayoshi Shimamura Hiroaki Yamanaka Yoshiyuki Uratani Akira Nagata Shuji Ishii Katsuyoshi Iida Eiji Kawai Masato Tsuru Global Scientific Information and Computing Center Tokyo Institute of Technology Network Testbed Research and Development Promotion Center National Institute of Information and Communications Technology Graduate School of Computer Science and Systems Engineering

To accommodate a wide variety of application services, the network virtualization environment (NVE) has received much attention. In an NVE, infrastructure providers (InPs) provide service providers (SPs) with virtual networks (VNs) using the InPs' substrate resources for the SPs' application services. Service providers have flexible requirements of topology, quality of service (QoS), and their dynamic changes on VNs. To meet all these requirements, traditional approaches based on performance guarantee relying only on InPs are inefficient and sometimes infeasible because they result in significant operational cost. We propose an architecture in which SPs can select appropriate resources from available resources and dynamically use the allocated resources depending on their application characteristics and user situations to meet their demands. In the proposed architecture, SPs can improve VN performance through resource control, and InPs are not required to have any performance guaranteed networks. Therefore, the proposed architecture can balance QoS and resource efficiency. We also present the basic design of the proposed architecture and show use cases and a prototype implementation using OpenFlow technologies.

关键词： Indium phosphide Servers Quality of service Topology Bandwidth Prototypes Control systems

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An implementation of a multi-site virtual cluster cloud

An implementation of a multi-site virtual cluster cloud

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International Joint Conference on Computer Science and Software Engineering (JCSSE)

作者： Pongsakorn U-chupala Putchong Uthayopas Kohei Ichikawa Susumu Date Hirotake Abe High Performance Computing and Networking Center Department of Computer Engineering Faculty of Engineering Kasetsart University Bangkok Thailand Software Design & Analysis Laboratory Graduate School of Information Science NAIST Nara Japan Cybermedia Center Osaka University Osaka Japan Division of Information Science Graduate School of Systems and Information Engineering University of Tsukuba Ibaragi Japan

ISBN: (纸本)9781479908059

The use of virtual cluster for High Performance computing (HPC) work has a great benefit of hiding the complexity of physical infrastructure while providing a familiar HPC environment for users. Nevertheless, setting up one is still a challenging task for most users. In addition, the ability to span a virtual cluster across a multi-site cloud can even create a great potential for users to harness a much higher processing power from the cloud. In this paper, the development of a multi-site virtual cluster cloud is presented. This is done by providing the cloud infrastructures tailored specifically for virtual cluster deployment along with related utilities such as web-interface monitor and command line tools. To realize this infrastructure, an overlay network is created using Virtual Private Network (VPN) technology to merge every site into a single broadcast domain. Moreover, a Multi-tier VPN network topology is proposed to enhance the communication performance among the multi-site cloud. A smart virtual machine scheduling mechanism is introduced to reduce performance degradation caused by network delays. The experimental results show that the virtual cluster works well with highly parallel task with low communication among task. Thus, this technology can be used to support many classes of important HPC applications.

关键词： Virtual private networks Overlay networks Virtual machining Servers Rocks Cloud computing Bandwidth

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Optimizing network receive performance in Xen

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High Technology Letters 2012年第4期18卷 350-356页

作者：张翔 Meng Dan Huo Zhigang Ma Jie National Research Center for Intelligent Computing Systems Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 P. R. China Graduate University of Chinese Academy of Sciences Beijing 100049 P. R. China

This paper presents two optimizations to improve the network receive performance in Xen, espe- cially for receiving small packets, by reducing per-packet overhead of network virtualization. First, the universal receive aggregation assembles incoming packets to decrease the cost of software bridge and bridge netfilter, no matter which protocol these packets use or whether they belong to the same TCP link. Second, the grant page sharing makes as many packets as possible share a single grant page to decrease the cost of expensive grant operations effectively. Experiment demonstrates that compared with default network virtualization in Xen, these two optimizations can reduce CPU cycles per packet by 31.20%, and improve UDP and TCP throughput by 37.73% and 25.62% on average.

关键词： virtualization network performance optimization aggregation grant page

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Estimation for presented images by EEGs during recongition and recalling

Estimation for presented images by EEGs during recongition a...

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International Conference on Fuzzy Theory and it's Applications (iFUZZY)

作者： Takahiro Yamanoi Yoshinori Tanaka Hisashi Toyoshima Mika Otsuki Shin-ichi Ohnishi Toshimasa Yamazaki Michio Sugeno Graduate School of Engineering Hokkai-Gakuen University Sapporo Japan Japan Technical Software Sapporo Japan Faculty of Health Sciences Hokkaido University Sapporo Japan Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Japan Edificio Cientifico Technologico European Center for Soft Computing Mieres-Asutrias Spain

The present authors recorded electroencephalograms (EEGs) from subjects viewing four types of line drawings of body part, tetrapod, home appliance, that were presented on a CRT. The authors investigated a single trial EEGs of the subject precisely after the latency at 400 ms, and determined effective sampling latencies for the discriminant analysis to some types of images. They sampled EEG data at latencies from 400 ms to 900 ms at 25 ms intervals by the four channels such as Fp2, F4, C4 and F8. Data were resampled -1 ms and -2 ms backward. Results of the discriminant analysis with jack knife method for four type objective varieties, the discriminant rates for two subjects were more than 95 %.

关键词： Electroencephalography Educational institutions Ear Mouth Fingers Foot Electrodes

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Performance Evaluation of OLSR and AODV Protocols in a VANET Crossroad Scenario

Performance Evaluation of OLSR and AODV Protocols in a VANET...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Evjola Spaho Makoto Ikeda Leonard Barolli Faos Xhafa Muhammad Younas Makoto Takizawa Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Languages and Informatics Systems Technical University of Catalonia Barcelona Spain Department of Computing and Communication Technologies Oxford Brookes University Oxford UK Department of Computers and Information Science Seikei University Musashino Tokyo Japan

In this paper, we investigate the performance of OLSR and AODV protocols in a VANET crossroad scenario. The mobility patterns of vehicles are generated by means of CAVENET (Cellular Automaton based Vehicular Network) and as communication protocol simulator, is used NS3(Network Simulator 3). For the simulations, we used IEEE802.11p standard, TwoRayGroundPropagationLossModel and sent multiple CBR flows over UDP between ten pairs source-destination. We use Packet Delivery Ratio (PDR), throughput and delay as evaluation metrics. We compared the performance of both protocols and the simulation results shows that for big values of transmission rates, OLSR performs better than AODV. For small transmission rates, the delay is less than 0.1sec and both protocols can be used for real time applications such as safety applications. For big values of transmission rate, the delay is higher than 1 sec and these protocols can be used for applications that tolerate this delay such as streaming and entertainment.

关键词： Vehicles Delays Routing protocols Ad hoc networks Throughput Simulation

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