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16th European Conference on Pattern Languages of Programs, EuroPLoP 2011

作者： Oberortner, Ernst Sobernig, Stefan Zdun, Uwe Dustdar, Schahram Distributed Systems Group Information Systems Institute Vienna University of Technology Argentinierstrasse 8/184-1 A-1040 Vienna Austria UZA II Augasse 2-6 A-1090 Vienna Austria Software Architecture Faculty of Computer Science Vienna University Waehringerstrae 29 A-1090 Vienna Austria

ISBN: (纸本)9781450313025

In service-oriented systems, service-level agreements (SLA) are specified as contracts between service providers and service consumers. SLAs stipulate - among other things - the provided services' performance. A service provider must fulfill the agreements stated in SLAs, e.g., to avoid paying penalties. Service consumers must verify whether the service quality as purchased is delivered. We present an architectural design decision model (ADDM) covering the design of a QoS monitoring infrastructure. The ADDM collects design decisions about measuring, storing, and evaluating performance-related quality-of-service (QoS) agreements. The model includes various requirements and puts forth design solutions by referring to established architectural, remoting, and design patterns. We evaluate the ADDM to build the architecture of a QoS monitoring infrastructure in a case study. The model guides through the decision-making process of designing a QoS monitoring infrastructure. © 2011 ACM.

关键词： Quality of service

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Design and Evaluation of CRDMAC： Circular RTR Directional MAC Protocol for WANETs

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China Communications 2012年第6期9卷 1-13页

作者： Lu Huang Li Jie Dong Zhongping Ji Yusheng Department of Computer Science University of Tsukuba Tsukuba Science City3058573 Ibaraki Japan Fujitsu Limited Yokosuka 2390847 Kanagawa Japan Information Systems Architecture Science Research Division National Institute of Informatics Tokyo 1018460 Japan

Using directional antennas in Wireless Ad hoc Networks (WANETs) offers great potential of reducing the radio interference, and improving the communication throughput. Directional antennas, however, introduces new problems in the wireless Media Access Control (MAC), that is, the deafness and new hidden terminal problem, which may cause severe performance degradation. To solve the problems, we propose an effective Circular RTR Directional MAC (CRDMAC) protocol for WANETs by using a sub-transmission channel and Ready to Receive (RTR) packets, which modifies the IEEE 802.11 Distributed Coordinated Function (DCF). The sub-channel avoids collisions to other ongoing transmission, and the RTR packets notify the neighbor nodes that the mutual transmission has been finished. We evaluate the CRDMAC protocol through simulations and the results show that the proposed protocol outperforms existing DMAC (directional MAC) protocol and the CRCM (Circular RTS and CTS MAC) protocol in terms of throughput and packet drop rate.

关键词： WANETs MAC protocol directionalantenna deafness new hidden terminal

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Delay-bounded Sink Mobility in Wireless Sensor Networks

Delay-bounded Sink Mobility in Wireless Sensor Networks

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IEEE International Conference on Communications

作者： Yu Gu Yusheng Ji Jie Li Biao Han Baohua Zhao Information Systems Architecture Science Research Division National Institute of Informatics Department of Computer Science University of Tsukuba Tsukuba Science City State Key Laboratory of Networking and Switching Technology

ISBN: (纸本)9781457720529

This paper exploits sink mobility to prolong the network lifetime in wireless sensor networks (WSNs) where the information delay caused by moving the sink should be bounded. We build a unified framework for analyzing this joint sink mobility and routing problem. We offer a mathematical modeling that is general and captures diversified issues, e.g. sink mobility, routing, delay, etc. We discuss the induced subproblems and present efficient solutions for them. Then, we generalize these solutions and propose a polynomial-time optimal algorithm for the origin problem. In simulations, we show the benefits of involving a mobile sink. We also show that the impact of the delay bound on the network lifetime.

关键词： Sinks Wireless sensor networks Routing Problem mobility mathematical modeling

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A high-level power model for MPSoC on FPGA

A high-level power model for MPSoC on FPGA

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25th IEEE International Parallel and Distributed Processing Symposium, Workshops and Phd Forum, IPDPSW 2011

作者： Piscitelli, Roberta Pimentel, Andy D. Computer Systems Architecture Group Informatics Institute University of Amsterdam Netherlands

ISBN: (纸本)9780769543857

This paper presents a framework for high-level power estimation of multiprocessor systems-on-chip (MPSoC) architectures on FPGA. The technique is based on abstract execution profiles, called event signatures, and it operates at a higher level of abstraction than, e.g., commonly-used instruction-set simulator (ISS) based power estimation methods and should thus be capable of achieving good evaluation performance. As a consequence, the technique can be very useful in the context of early system-level design space exploration. We integrated the power estimation technique in a system-level MPSoC synthesis framework. Subsequently, using this framework, we designed a range of different candidate architectures which contain different numbers of Microblaze processors and compared our power estimation results to those from real measurements on a Virtex-6 FPGA board. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Fault mitigation schemes for future spaceflight multicore processors

Fault mitigation schemes for future spaceflight multicore pr...

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AIAA Infotech at Aerospace Conference and Exhibit 2012

作者： Alexander, James W. Clement, Bradley J. Gostelow, Kim P. Lai, John Y. Jet Propulsion Laboratory California Institute of Technology GN and C Hardware and Testbed Development Group 4800 Oak Grove Drive MS 198-235 Pasadena CA 91109 United States Jet Propulsion Laboratory California Institute of Technology Cyber Defense and Information Architecture Group 4800 Oak Grove Drive MS 301-285 Pasadena CA 91109 United States Jet Propulsion Laboratory California Institute of Technology Advanced Computer Systems and Technologies Group 4800 Oak Grove Drive MS 321-151 Pasadena CA 91109 United States

ISBN: (数字)9781600869396

ISBN: (纸本)9781600869396

Future planetary exploration missions demand significant advances in on-board computing capabilities over current avionics architectures based on a single-core processing element. The state-of-the-art multi-core processor provides much promise in meeting such challenges while introducing new fault tolerance problems when applied to space missions. Software-based schemes are being presented in this paper that can achieve system-level fault mitigation beyond that provided by radiation-hard-by-design (RHBD). For mission and time critical applications such as the Terrain Relative Navigation (TRN) for planetary or small body navigation, and landing, a range of fault tolerance methods can be adapted by the application. The software methods being investigated include Error Correction Code (ECC) for data packet routing between cores, virtual network routing, Triple Modular Redundancy (TMR), and Algorithm-Based Fault Tolerance (ABFT). A robust fault tolerance framework that provides fail-operational behavior under hard real-time constraints and graceful degradation will be demonstrated using TRN executing on a commercial Tilera® processor with simulated fault injections. © 2012 by the American institute of Aeronautics and Astronautics, Inc.

关键词： Fault tolerance

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Design metrics and visualization techniques for analyzing the performance of MOEAs in DSE

Design metrics and visualization techniques for analyzing th...

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2011 11th International Conference on Embedded computer systems: architectures, Modeling and Simulation, IC-SAMOS 2011

作者： Taghavi, Toktam Pimentel, Andy D. Computer Systems Architecture Group Informatics Institute University of Amsterdam Amsterdam Netherlands

ISBN: (纸本)9781457708008

VMODEX is an interactive visualization tool to support system-level Design Space Exploration (DSE) of MPSoC architectures. It was initially developed to help designers to get insight into the search process of Multi-Objective Evolutionary Algorithms (MOEAs) that are typically used in the DSE process, and facilitates the analysis of the DSE results. In this paper, we extend VMODEX to help algorithm developers as well. Since there are many different MOEAs to search a design space and there is no conclusive answer regarding which algorithm is the best for a specific problem, finding the best optimization algorithm is a big challenge. However, using VMODEX, algorithm developers can easily evaluate and compare the results of different searching algorithms, for a given problem, with respect to their efficiency and effectiveness, in order to find the best optimization algorithm. Then, the best optimization results are delivered to the designers for analyzing the design space exploration process. © 2011 IEEE.

关键词： Visualization

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Lane recognition for moving vehicles using multiple on-car RFID receiver antennas — Algorithm and its experimental results

Lane recognition for moving vehicles using multiple on-car R...

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IEEE Symposium on Intelligent Vehicle

作者： Hiroaki Togashi Cristian Borcea Shigeki Yamada Department of Informatics Graduate University for Advanced Studies (SOKENDAI) Tokyo Japan Department of Computer Science New Jersey Institute of Technology New Jersey USA Information Systems Architecture Research Division National Institute of Information Tokyo Japan

Accurate lane recognition for moving vehicles is important for lane keeping and lane changing assistance systems. Additionally, this information could be leveraged by Intelligent Transportation systems to suggest lane changes for improved traffic load balancing across lanes. This paper presents a position estimation algorithm for moving vehicles based on RFID (Radio Frequency Identification) active sensors placed on roadsides and lane boundaries, and multiple on-car RFID receiver antennas. To improve localization accuracy, the algorithm proposes two novel ideas: (1) compute pair-wise position estimates using the RSSI (Received Signal Strength Indication) of all pairs of signals received from RFIDs, and (2) compute the final position as a weighted average of these pair-wise estimates using a dynamic weighting function that assigns higher weights to positions estimated based on closer RFIDs. The results from our field experiments indicate that the proposed method achieves 0.7-meter localization accuracy when RFIDs are placed at 0.5-meter intervals and a vehicle has 8 antennas. This accuracy allows a moving vehicle to recognize which lane it is in. The localization accuracy of the proposed method was found to be mostly stable for any type of road shape and any number of lanes. A further 14% accuracy improvement is achieved when RFIDs are placed at 0.25-meter intervals and the RFIDs located farther than 30-meter are excluded from computation.

关键词： Radiofrequency identification Vehicles Accuracy Estimation Receiving antennas Roads

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Signature-based calibration of analytical performance models for system-level design space exploration

Signature-based calibration of analytical performance models...

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作者： Jaddoe, Stanley Thompson, Mark Pimentel, Andy D. Computer Systems Architecture Group Informatics Institute University of Amsterdam Netherlands

ISBN: (纸本)9783642245671

The Sesame system-level simulation framework targets efficient design space exploration of embedded multimedia systems. Even despite Sesame's high efficiency, it would still fail to explore large parts of the design space simply because system-level simulation is too slow for this. Therefore, Sesame uses analytical performance models to provide steering to the system-level simulation, guiding it toward promising system architectures and thus pruning the design space. In this paper, we present a mechanism based on execution profiles, referred to as signatures, to calibrate these analytical models with the aim to deliver trustworthy estimates. Moreover, we also present a number of experiments in which we evaluate the accuracy of our signature-based performance models using a case study with a Motion-JPEG encoder and the Mediabench benchmark suite for performing off-line calibration of the models. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Analytical models

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A QoS based call admission control and resource allocation mechanism for LTE femtocell deployment

A QoS based call admission control and resource allocation m...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Cristian Olariu John Fitzpatrick Philip Perry Liam Murphy Telecommunication Software and Systems Group Waterford Institute of Technology Waterford Ireland NEC Laboratories Europe NEC Europe Limited Heidelberg Germany School of Computer Science and Informatics University College Dublin Dublin Ireland

Current trends show a growing number of femtocell deployments, this in turn will lead to increased volumes of voice traffic being transmitted through fixed broadband access networks such as Digital Subscriber Line. In this paper the issue of maintaining call quality through the resource constraint expedited forwarding queue of DSLAMs is investigated. A quality based Call Admission Control and resource allocation mechanism is provided to avoid resource overloading and call quality degradation. The ITU-T's E-Model is used for call quality monitoring and a message exchange interface between the mobile and fixed networks which allows dynamic adjustment to network resources is described and simulated. The results show that high voice call quality can be maintained.

关键词： Bandwidth Resource management Monitoring Synchronization DSL Call admission control Quality of service

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Better be reactive at the beginning. Implications of the first seconds of an encounter for the tutoring style in human-robot-interaction

Better be reactive at the beginning. Implications of the fir...

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IEEE International Symposium on Robot and Human Interactive Communication

作者： Karola Pitsch Katrin S. Lohan Katharina Rohlfing Joe Saunders Chrystopher L. Nehaniv Britta Wrede Applied Informatics Group and the Research Institute for Cognition and Robotics Faculty of Technology Bielefeld University Cognitive Humanoids Lab Istituto Italiano di Tecnologia for Robotics Brain & Cognitive Sciences Emergentist Semantics group at Bielefeld University Adaptive Systems Research Group School of Computer Science University of Hertfordshire

ISBN: (纸本)9781467346047

The paper investigates the effects of a robot's "on-line" feedback during a tutoring situation with a human tutor. Analysis is based on a study conducted with an iCub robot that autonomously generates its feedback (gaze, pointing gesture) based on the system's perception of the tutor's actions using the idea of reciprocity of actions. Sequential micro-analysis of two opposite cases reveals how the robot's behavior (responsive vs. non-responsive) pro-actively shapes the tutor's conduct and thus co-produces the way in which it is being tutored. A dialogic and a monologic tutoring style are distinguished. The first 20 seconds of an encounter are found to shape the user's perception and expectations of the system's competences and lead to a relatively stable tutoring style even if the robot's reactivity and appropriateness of feedback changes.

关键词： Coaching ENCOUNTERS Robot Feedback Human machine interaction REACTIVE cargo

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