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PISA: P2P Wi-Fi Internet Sharing Architecture

PISA: P2P Wi-Fi Internet Sharing Architecture

引用

International Conference on Peer-to-Peer Computing

作者： Tobias Heer Shaohui Li Klaus Wehrle Distributed Systems Group Computer Science Department RWTH Aachen University Germany

The demand for cheap broadband Internet for nomadic users has created a market for Internet sharing. Wi- Fi communities which allow their users to share their wired Internet connections have emerged and become increasingly popular. Organizations like FON promise to provide free wireless Internet access in many places. However, user authentication is the Achilles heel of these systems. A user that allows other community members to use its access point must expect to be held responsible for other users' actions. Moreover, these Wi-Fi sharing systems are often insecure which allows eavesdroppers to gather sensitive information on the wireless link. This work provides efficient, scalable, and secure access control for large Wi-Fi sharing systems. The host identity protocol (HIP) is used as a building block for a solution which supports strong user authentication as well as mobility support for nomadic users. In our presentation, we show the feasibility and effectiveness of this approach by demonstrating the PISA authentication protocol in action.

关键词： Internet Authentication Traffic control Cryptography communication system security Access control Access protocols IP networks Law Hip

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Primary-Context Model and Ontology: A Combined Approach for Pervasive Transportation Services

Primary-Context Model and Ontology: A Combined Approach for ...

引用

IEEE Annual Conference on Pervasive Computing and communications Workshops (PerCom)

作者： Deirdre Lee Rene Meier Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

Advanced pervasive transportation services aim to improve the safety and efficiency of public and private transportation facilities, while reducing operating costs and improving the travel experience for drivers, passengers and other travellers. In order to achieve these goals, such services require access to context information from a myriad of distributed, heterogeneous intelligent transportation systems. A context management scheme that models information in a standard fashion is essential to support information sharing between individual systems, and higher-level information reasoning. This paper presents an ontology-based spatial context model, which takes a combined approach to modelling context information utilised by pervasive transportation services: the primary-context model facilitates interoperation across independent intelligent transportation systems, whereas the primary-context ontology enables pervasive transportation services to reason about shared context information and to react accordingly. The independently defined, distributed information is correlated based on its primary-context: location, time, identity, and quality of service. The primary-context model and ontology have been evaluated by modelling a car park system for a smart parking space locator service

关键词： Ontologies Context modeling Context-aware services Intelligent transportation systems Phase change materials Quality of service Dynamic programming Monitoring Telecommunication traffic Pervasive computing

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Fast and effective kernels for relational learning from texts 07

Fast and effective kernels for relational learning from text...

引用

24th International Conference on Machine Learning, ICML 2007

作者： Moschitti, Alessandro Zanzotto, Fabio Massimo Department of Information and Communication Technology University of Trento 38050 Povo di Trento Italy Department of Computer Science Systems and Production University of Rome Tor Vergata 00133 Rome Italy

ISBN: (纸本)9781595937933

In this paper, we define a family of syntactic kernels for automatic relational learning from pairs of natural language sentences. We provide an efficient computation of such models by optimizing the dynamic programming algorithm of the kernel evaluation. Experiments with Support Vector Machines and the above kernels show the effectiveness and efficiency of our approach on two very important natural language tasks, Textual Entailment Recognition and Question Answering.

关键词： Text processing

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Dynamic service scheduling for workflow applications in service oriented grid

Dynamic service scheduling for workflow applications in serv...

引用

3rd International Conference on Semantics, Knowledge, and Grid, SKG 2007

作者： Chin, SungHo Lee, JongHyuk Song, SeongJin Song, Byungkwen Yu, HeonChang Distributed and Grid Computing Lab. Department of Computer Science Education Korea University Anam-dong Sungbuk-ku Seoul 136-701 Korea Republic of Dept. of Information and Communication Seokyeong University Korea Republic of

ISBN: (纸本)0769530079

In the Service Oriented Grid, a grid application can be composed of diverse Grid Services which may be already deployed on grid sites, and dependencies between these Grid Services can be described as the workflow graph. Though many grid scheduling methods have been developed, they have been studied based on static heterogeneous computing environment. For this reason, these heuristics cannot be directly applied to Grid, which is more dynamic computing environment. Therefore, we develop the dynamic service scheduling method, which support that the workflow applications can be performed effectively in spite of dynamic Grid nature. Lastly, we show that our proposed scheduling method outperforms than other conventional scheduling methods through the various experiments. © 2007 IEEE.

关键词： Scheduling

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Impact of HSDPA transmit power allocation schemes on the performance of UMTS networks

Impact of HSDPA transmit power allocation schemes on the per...

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Australasian Telecommunication Networks and Applications Conference, ATNAC

作者： Andreas Mader Dirk Staehle Rastin Pries Markus Spahn Institute of Computer Science Department of Distributed Systems University of Würzburg Wurzburg Germany

In UMTS networks, the transmit power for the HSDPA can be a large fraction of the total transmit power of a NodeB. We investigate the impact of three HSDPA transmit power allocation schemes on the performance of a UMTS system with dedicated channel users and HSDPA users. The continuous HSDPA power allocation scheme avoids large steps of the transmit power in order to prevent irregularities in the downlink power control of dedicated channels. In contrast, the traffic-aware scheme switches the HSDPA power on only if data has to be transmitted. The power-ramping scheme combines the continuous and the traffic-aware scheme. The simulation model considers the complete interference situation in the network and uses a novel model to calculate HSDPA bandwidths. The results quantify the performance loss with the continuous scheme caused by additional interference, and show that the power-ramping scheme leads to results close to the traffic-aware scheme.

关键词： Multiaccess communication 3G mobile communication Traffic control communication system traffic control Interference Downlink Power control Switches Bandwidth Performance loss

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An empirical study of the potential for context-aware power management 07

An empirical study of the potential for context-aware power ...

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Proceedings of the 9th international conference on Ubiquitous computing

作者： Colin Harris Vinny Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin 2 Ireland

ISBN: (纸本)9783540748526

Context-aware power management (CAPM) uses context (e.g., user location) likely to be available in future ubiquitous computing environments, to effectively power manage a building's energy consuming devices. The objective of CAPM is to minimise overall energy consumption while maintaining user-perceived device *** principal context required by CAPM is when the user is NOT USING and when the user is about to use a device. Accurately inferring this user context is challenging and there is a balance between how much energy additional context can save and how much it will cost energy wise. This paper presents results from a detailed user study that investigated the potential of such *** results show that CAPM is a hard problem. It is possible to get within 6% of the optimal policy, but policy performance is very dependent on user behaviour. Furthermore, adding more sensors to improve context inference can actually increase overall energy consumption.

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Comparative Study of the IEEE 802.16 Random Access Mechanisms

Comparative Study of the IEEE 802.16 Random Access Mechanism...

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International Conference on Next Generation Mobile Applications, Services and Technologies (NGMAST)

作者： Dirk Staehle Rastin Pries Institute of Computer Science Department of Distributed Systems University of Würzburg Wurzburg Germany

The WiMAX technology based on the IEEE802.16 standard is currently the most prospective candidate for broadband wireless access networks. One of the key issues is the design of the MAC layer, in particular the multiple access scheme. The IEEE 802.16 standard specifies different scheduling services with individual mechanisms for accessing the channel on the uplink. The non-real-time polling service and the best-effort service mainly rely on a contention mechanism to submit bandwidth requests to the base station. These two services are currently used for all types of traffic with unknown characteristics, i.e. typically all traffic except for some special VoIP connection with known codec. In this paper, we evaluate and compare the performance of the contention mechanisms for fixed and mobile WiMAX.

关键词： Bandwidth WiMAX Base stations Delay OFDM Traffic control Wireless networks Codecs Buffer storage Investments

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A Session-Initiation-Protocol-Based Middleware for Multi-Application Management

A Session-Initiation-Protocol-Based Middleware for Multi-App...

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IEEE International Conference on communications (ICC)

作者： T. Guenkova-Luy H. Schmidt A. Schorr F. J. Hauck A. Kassler Institute of Distributed Systems University of Ulm Germany Computer Science Department Karlstad University Sweden

The deployment of multimedia services in next- generation networks is a challenge due to the high configuration complexity of the streaming process in different stationary and mobile sub-networks and for various user devices. The session initiation protocol (SIP) has proven to be a suitable mechanism to handle the control of multimedia services in such networks. However, the current standardization and implementation of SIP do not allow the simultaneous coordination of multiple concurrent applications on a single device, as the prescribed realization of the SIP state machines (transactions) does not consider mutual access of applications to a single SIP stack. This paper presents a SIP- based mechanism for synchronized management of services in a shared environment. We have developed a middleware that facilitates the uniform access of multiple applications towards one or multiple SIP stacks to enable prioritization of services and centralized resource coordination of concurrent SIP applications on a single terminal or server.

关键词： Middleware Multimedia systems Environmental management Streaming media Protocols Quality of service Standardization Application software File servers Network servers

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Service Mobility with SIP, SDP and MPEG-21

Service Mobility with SIP, SDP and MPEG-21

引用

International Conference on Telecommunications (ConTEL)

作者： Teodora Guenkova-Luy Holger Schmidt Franz J. Hauck Andreas Kassler Institute of Distributed Systems University of Ulm Germany Computer Science Department Karlstad University Sweden

The ubiquitous access to multimedia services anywhere and at any time requires flexible service accommodation to user requirements and to device capabilities. At mobility of persons and devices, it is possible to enforce not only terminal-based adaptations, but also the media sessions can migrate from device to device to optimize the user experience. As the capabilities of mobile hand-held devices are limited, migrating sessions to close-by high-performance terminals like wall displays or in-home entertainment systems will indeed contribute to optimized device application and to more satisfactory media consumption. The current SIP/SDP framework can partially enable a session-migration process. However, SIP/SDP lacks advanced client-search and description capabilities. On the other hand, MPEG-21 DI can support sophisticated service descriptions but it misses a control-data exchange approach. Therefore, this paper proposes to merge concepts from IMS using SIP/SDP(ng) with MPEG-21 DI to implement a novel session migration concept based on standardized mechanisms.

关键词： Multimedia systems Middleware Pervasive computing Multimedia computing Streaming media distributed computing Displays Mobile computing Nonhomogeneous media Hardware

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Feedforward adaptation to stable and unstable dynamics in arm movements

Feedforward adaptation to stable and unstable dynamics in ar...

引用

2007 Mediterranean Conference on Control and Automation, MED

作者： Ito, Koji Doi, Makoto Kondo, Toshiyuki Tokyo Institute of Technology Department of Computational Intelligence and Systems Science Yokohama Japan DENSO Corporation Kariya Japan Tokyo University of Agriculture and Technology Department of Computer Information and Communication Sciences Tokyo Japan

ISBN: (纸本)142441282X

In daily life, humans must compensate for the resultant forces arising from interaction with the physical environment. Recent studies have shown that humans can acquire a neural representation of the relation between motor command and movement, i.e. learn an internal model of the environment dynamics. The present paper discusses the feedforward adaptation under a varying dynamical environment during reaching movements. Subjects first learned reaching movements in a position-dependent divergent force field (DF) and velocity-dependent force field (VF), and then in a switched force field SF1 (DFVF) and SF2 (VFDF). The experimental results show that the adaptation to the switched force fields has been achieved by combining the internal model-based control and the impedance control in a feedforward manner. ©2007 IEEE.

关键词： Dynamical environment Feedforward adaptation Reaching movement Sensory-motor function

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